Merge branch 'bugfix/ARSN-347/revert-commit' into tmp/octopus/w/7.70/bugfix/ARSN-347/revert-commit

Revert "bf: ARSN-340 bump socket.io dep to 4.6.1"
This reverts commit af3fd17ec2.
2023-06-08 12:23:43 +00:00 · 2023-06-08 07:55:56 -04:00
213 changed files with 9673 additions and 27850 deletions
--- a/.eslintrc
+++ b/.eslintrc
@ -1,6 +1 @@
-{
-    "extends": "scality",
-    "parserOptions": {
-        "ecmaVersion": 2020
-    }
-}
+{ "extends": "scality" }
--- a/.github/workflows/codeql.yaml
+++ b/.github/workflows/codeql.yaml
@ -14,12 +14,12 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3

      - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
+        uses: github/codeql-action/init@v2
        with:
          languages: javascript, typescript

      - name: Build and analyze
-        uses: github/codeql-action/analyze@v3
+        uses: github/codeql-action/analyze@v2
--- a/.github/workflows/dependency-review.yaml
+++ b/.github/workflows/dependency-review.yaml
@ -10,7 +10,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: 'Checkout Repository'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3

      - name: 'Dependency Review'
-        uses: actions/dependency-review-action@v4
+        uses: actions/dependency-review-action@v3
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@ -25,30 +25,24 @@ jobs:
          - 6379:6379
    steps:
    - name: Checkout
-      uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
+      uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
      with:
        node-version: '16'
        cache: 'yarn'
    - name: install dependencies
-      run: yarn install --frozen-lockfile --prefer-offline --network-concurrency 1
+      run: yarn install --frozen-lockfile --prefer-offline
      continue-on-error: true # TODO ARSN-97 Remove it when no errors in TS
    - name: lint yaml
      run: yarn --silent lint_yml
    - name: lint javascript
-      run: yarn --silent lint --max-warnings 0
+      run: yarn --silent lint -- --max-warnings 0
    - name: lint markdown
      run: yarn --silent lint_md
-    - name: add hostname
-      run: |
-        sudo sh -c "echo '127.0.0.1 testrequestbucket.localhost' >> /etc/hosts"
-    - name: test and coverage
-      run: yarn --silent coverage
+    - name: run unit tests
+      run: yarn test
    - name: run functional tests
      run: yarn ft_test
-    - uses: codecov/codecov-action@v4
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }}
    - name: run executables tests
      run: yarn install && yarn test
      working-directory: 'lib/executables/pensieveCreds/'
@ -59,9 +53,9 @@ jobs:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v2
    - name: Install NodeJS
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v2
      with:
        node-version: '16'
        cache: yarn
@ -72,7 +66,7 @@ jobs:
      run: yarn build
      continue-on-error: true # TODO ARSN-97 Remove it when no errors in TS
    - name: Upload artifacts
-      uses: scality/action-artifacts@v4
+      uses: scality/action-artifacts@v2
      with:
        url: https://artifacts.scality.net
        user: ${{ secrets.ARTIFACTS_USER }}
--- a/.swcrc
+++ b/.swcrc
@ -1,12 +0,0 @@
-{
-  "$schema": "https://swc.rs/schema.json",
-  "jsc": {
-    "parser": {
-      "syntax": "typescript"
-    },
-    "target": "es2017"
-  },
-  "module": {
-    "type": "commonjs"
-  }
-}
--- a/README.md
+++ b/README.md
@ -1,7 +1,5 @@
 # Arsenal

-[![codecov](https://codecov.io/gh/scality/Arsenal/branch/development/8.1/graph/badge.svg?token=X0esXhJSwb)](https://codecov.io/gh/scality/Arsenal)
-
 Common utilities for the S3 project components

 Within this repository, you will be able to find the shared libraries for the
--- a/documentation/BucketInfoModelVersion.md
+++ b/documentation/BucketInfoModelVersion.md
@ -85,66 +85,6 @@ Used to store the bucket lifecycle configuration info

 ### Properties Added

-```javascript
-this._uid = uid || uuid();
-```
-
-### Usage
-
-Used to set a unique identifier on a bucket
-
-## Model version 8
-
-### Properties Added
-
-```javascript
-this._readLocationConstraint = readLocationConstraint || null;
-```
-
-### Usage
-
-Used to store default read location of the bucket
-
-## Model version 9
-
-### Properties Added
-
-```javascript
-this._isNFS = isNFS || null;
-```
-
-### Usage
-
-Used to determine whether the bucket may be accessed through NFS
-
-## Model version 10
-
-### Properties Added
-
-```javascript
-this._ingestion = ingestionConfig || null;
-```
-
-### Usage
-
-Used to store the ingestion status of a bucket
-
-## Model version 11
-
-### Properties Added
-
-```javascript
-this._azureInfo = azureInfo || null;
-```
-
-### Usage
-
-Used to store Azure storage account specific information
-
-## Model version 12
-
-### Properties Added
-
 ```javascript
 this._objectLockEnabled = objectLockEnabled || false;
 this._objectLockConfiguration = objectLockConfiguration || null;
@ -155,7 +95,7 @@ this._objectLockConfiguration = objectLockConfiguration || null;
 Used to determine whether object lock capabilities are enabled on a bucket and
 to store the object lock configuration of the bucket

-## Model version 13
+## Model version 8

 ### Properties Added

@ -167,7 +107,7 @@ this._notificationConfiguration = notificationConfiguration || null;

 Used to store the bucket notification configuration info

-## Model version 14
+## Model version 9

 ### Properties Added

@ -179,7 +119,19 @@ this._serverSideEncryption.configuredMasterKeyId = configuredMasterKeyId || unde

 Used to store the users configured KMS key id

-## Model version 15
+## Model version 10
+
+### Properties Added
+
+```javascript
+this._uid = uid || uuid();
+```
+
+### Usage
+
+Used to set a unique identifier on a bucket
+
+## Model version 11

 ### Properties Added

@ -187,74 +139,6 @@ Used to store the users configured KMS key id
 this._tags = tags || null;
 ```

-The Tag Set of a bucket is an array of objects with Key and Value:
-
-```javascript
-[
-    {
-        Key: 'something',
-        Value: 'some_data'
-    }
-]
-```
-
-## Model version 16
-
-### Properties Added
-
-```javascript
-this._capabilities = capabilities || undefined;
-```
-
-For capacity-enabled buckets, contains the following data:
-
-```javascript
-{
-    _capabilities: {
-        VeeamSOSApi?: {
-            SystemInfo?: {
-                ProtocolVersion: String,
-                ModelName: String,
-                ProtocolCapabilities: {
-                    CapacityInfo: Boolean,
-                    UploadSessions: Boolean,
-                    IAMSTS: Boolean,
-                },
-                APIEndpoints: {
-                    IAMEndpoint: String,
-                    STSEndpoint: String,
-                },
-                SystemRecommendations?: {
-                    S3ConcurrentTaskLimit: Number,
-                    S3MultiObjectDelete: Number,
-                    StorageCurrentTasksLimit: Number,
-                    KbBlockSize: Number,
-                }
-                LastModified?: String,
-            },
-            CapacityInfo?: {
-                Capacity: Number,
-                Available: Number,
-                Used: Number,
-                LastModified?: String,
-            },
-        }
-    },
-}
-```
-
 ### Usage

 Used to store bucket tagging
-
-## Model version 17
-
-### Properties Added
-
-```javascript
-this._quotaMax = quotaMax || 0;
-```
-
-### Usage
-
-Used to store bucket quota
--- a/documentation/listingAlgos/delimiter.md
+++ b/documentation/listingAlgos/delimiter.md
@ -1,27 +0,0 @@
-# Delimiter
-
-The Delimiter class handles raw listings from the database with an
-optional delimiter, and fills in a curated listing with "Contents" and
-"CommonPrefixes" as a result.
-
-## Expected Behavior
-
- only lists keys belonging to the given **prefix** (if provided)
-
- groups listed keys that have a common prefix ending with a delimiter
-  inside CommonPrefixes
-
- can take a **marker** or **continuationToken** to list from a specific key
-
- can take a **maxKeys** parameter to limit how many keys can be returned
-
-## State Chart
-
- States with grey background are *Idle* states, which are waiting for
-  a new listing key
-
- States with blue background are *Processing* states, which are
-  actively processing a new listing key passed by the filter()
-  function
-
-![Delimiter State Chart](./pics/delimiterStateChart.svg)
--- a/documentation/listingAlgos/delimiterMaster.md
+++ b/documentation/listingAlgos/delimiterMaster.md
@ -1,45 +0,0 @@
-# DelimiterMaster
-
-The DelimiterMaster class handles raw listings from the database of a
-versioned or non-versioned bucket with an optional delimiter, and
-fills in a curated listing with "Contents" and "CommonPrefixes" as a
-result.
-
-## Expected Behavior
-
- only lists latest versions of versioned buckets
-
- only lists keys belonging to the given **prefix** (if provided)
-
- does not list latest versions that are delete markers
-
- groups listed keys that have a common prefix ending with a delimiter
-  inside CommonPrefixes
-
- can take a **marker** or **continuationToken** to list from a specific key
-
- can take a **maxKeys** parameter to limit how many keys can be returned
-
- reconciles internal PHD keys with the next version (those are
-  created when a specific version that is the latest version is
-  deleted)
-
- skips internal keys like replay keys
-
-## State Chart
-
- States with grey background are *Idle* states, which are waiting for
-  a new listing key
-
- States with blue background are *Processing* states, which are
-  actively processing a new listing key passed by the filter()
-  function
-
-### Bucket Vformat=v0
-
-![DelimiterMaster State Chart for v0 format](./pics/delimiterMasterV0StateChart.svg)
-
-### Bucket Vformat=v1
-
-For buckets in versioning key format **v1**, the algorithm used is the
-one from [Delimiter](delimiter.md).
--- a/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
+++ b/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
@ -1,45 +0,0 @@
-digraph {
-  node [shape="box",style="filled,rounded",fontsize=16,fixedsize=true,width=3];
-  edge [fontsize=14];
-  rankdir=TB;
-
-  START [shape="circle",width=0.2,label="",style="filled",fillcolor="black"]
-  END [shape="circle",width=0.2,label="",style="filled",fillcolor="black",peripheries=2]
-
-  node [fillcolor="lightgrey"];
-  "NotSkippingPrefixNorVersions.Idle" [label="NotSkippingPrefixNorVersions",group="NotSkippingPrefixNorVersions",width=4];
-  "SkippingPrefix.Idle" [label="SkippingPrefix",group="SkippingPrefix"];
-  "SkippingVersions.Idle" [label="SkippingVersions",group="SkippingVersions"];
-  "WaitVersionAfterPHD.Idle" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
-
-  node [fillcolor="lightblue"];
-  "NotSkippingPrefixNorVersions.Processing" [label="NotSkippingPrefixNorVersions",group="NotSkippingPrefixNorVersions",width=4];
-  "SkippingPrefix.Processing" [label="SkippingPrefix",group="SkippingPrefix"];
-  "SkippingVersions.Processing" [label="SkippingVersions",group="SkippingVersions"];
-  "WaitVersionAfterPHD.Processing" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
-
-  START -> "SkippingVersions.Idle" [label="[marker != undefined]"]
-  START -> "NotSkippingPrefixNorVersions.Idle" [label="[marker == undefined]"]
-
-  "NotSkippingPrefixNorVersions.Idle" -> "NotSkippingPrefixNorVersions.Processing" [label="filter(key, value)"]
-  "SkippingPrefix.Idle" -> "SkippingPrefix.Processing" [label="filter(key, value)"]
-  "SkippingVersions.Idle" -> "SkippingVersions.Processing" [label="filter(key, value)"]
-  "WaitVersionAfterPHD.Idle" -> "WaitVersionAfterPHD.Processing" [label="filter(key, value)"]
-
-
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingVersions.Idle" [label="[Version.isDeleteMarker(value)]\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "WaitVersionAfterPHD.Idle" [label="[Version.isPHD(value)]\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(<ReplayPrefix>)]\n/ prefix <- <ReplayPrefix>\n-> FILTER_SKIP"]
-  "NotSkippingPrefixNorVersions.Processing" -> END [label="[isListableKey(key, value) and\nKeys == maxKeys]\n-> FILTER_END"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingPrefix.Idle" [label="[isListableKey(key, value) and\nnKeys < maxKeys and\nhasDelimiter(key)]\n/ prefix <- prefixOf(key)\n/ CommonPrefixes.append(prefixOf(key))\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingVersions.Idle" [label="[isListableKey(key, value) and\nnKeys < maxKeys and\nnot hasDelimiter(key)]\n/ Contents.append(key, value)\n-> FILTER_ACCEPT"]
-
-  "SkippingPrefix.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(prefix)]\n-> FILTER_SKIP"]
-  "SkippingPrefix.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not key.startsWith(prefix)]"]
-
-  "SkippingVersions.Processing" -> "SkippingVersions.Idle" [label="[isVersionKey(key)]\n-> FILTER_SKIP"]
-  "SkippingVersions.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not isVersionKey(key)]"]
-
-  "WaitVersionAfterPHD.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[isVersionKey(key) and master(key) == PHDkey]\n/ key <- master(key)"]
-  "WaitVersionAfterPHD.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not isVersionKey(key) or master(key) != PHDkey]"]
-}
--- a/documentation/listingAlgos/pics/delimiterMasterV0StateChart.svg
+++ b/documentation/listingAlgos/pics/delimiterMasterV0StateChart.svg
@ -1,216 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: %3 Pages: 1 -->
-<svg width="2313pt" height="460pt"
- viewBox="0.00 0.00 2313.37 460.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 456)">
-<title>%3</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-456 2309.37,-456 2309.37,4 -4,4"/>
-<!-- START -->
-<g id="node1" class="node">
-<title>START</title>
-<ellipse fill="black" stroke="black" cx="35.37" cy="-445" rx="7" ry="7"/>
-</g>
-<!-- NotSkippingPrefixNorVersions.Idle -->
-<g id="node3" class="node">
-<title>NotSkippingPrefixNorVersions.Idle</title>
-<path fill="lightgrey" stroke="black" d="M925.37,-387C925.37,-387 661.37,-387 661.37,-387 655.37,-387 649.37,-381 649.37,-375 649.37,-375 649.37,-363 649.37,-363 649.37,-357 655.37,-351 661.37,-351 661.37,-351 925.37,-351 925.37,-351 931.37,-351 937.37,-357 937.37,-363 937.37,-363 937.37,-375 937.37,-375 937.37,-381 931.37,-387 925.37,-387"/>
-<text text-anchor="middle" x="793.37" y="-365.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefixNorVersions</text>
-</g>
-<!-- START&#45;&gt;NotSkippingPrefixNorVersions.Idle -->
-<g id="edge2" class="edge">
-<title>START&#45;&gt;NotSkippingPrefixNorVersions.Idle</title>
-<path fill="none" stroke="black" d="M42.39,-443.31C95.3,-438.15 434.98,-404.99 638.94,-385.08"/>
-<polygon fill="black" stroke="black" points="639.54,-388.53 649.15,-384.08 638.86,-381.57 639.54,-388.53"/>
-<text text-anchor="middle" x="497.87" y="-408.8" font-family="Times,serif" font-size="14.00">[marker == undefined]</text>
-</g>
-<!-- SkippingVersions.Idle -->
-<g id="node5" class="node">
-<title>SkippingVersions.Idle</title>
-<path fill="lightgrey" stroke="black" d="M242.37,-138C242.37,-138 50.37,-138 50.37,-138 44.37,-138 38.37,-132 38.37,-126 38.37,-126 38.37,-114 38.37,-114 38.37,-108 44.37,-102 50.37,-102 50.37,-102 242.37,-102 242.37,-102 248.37,-102 254.37,-108 254.37,-114 254.37,-114 254.37,-126 254.37,-126 254.37,-132 248.37,-138 242.37,-138"/>
-<text text-anchor="middle" x="146.37" y="-116.2" font-family="Times,serif" font-size="16.00">SkippingVersions</text>
-</g>
-<!-- START&#45;&gt;SkippingVersions.Idle -->
-<g id="edge1" class="edge">
-<title>START&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M33.04,-438.14C20.64,-405.9 -34.57,-248.17 33.37,-156 36.76,-151.4 40.74,-147.39 45.16,-143.89"/>
-<polygon fill="black" stroke="black" points="47.27,-146.68 53.53,-138.13 43.3,-140.92 47.27,-146.68"/>
-<text text-anchor="middle" x="85.87" y="-321.8" font-family="Times,serif" font-size="14.00">[marker != undefined]</text>
-</g>
-<!-- END -->
-<g id="node2" class="node">
-<title>END</title>
-<ellipse fill="black" stroke="black" cx="727.37" cy="-120" rx="7" ry="7"/>
-<ellipse fill="none" stroke="black" cx="727.37" cy="-120" rx="11" ry="11"/>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing -->
-<g id="node7" class="node">
-<title>NotSkippingPrefixNorVersions.Processing</title>
-<path fill="lightblue" stroke="black" d="M925.37,-300C925.37,-300 661.37,-300 661.37,-300 655.37,-300 649.37,-294 649.37,-288 649.37,-288 649.37,-276 649.37,-276 649.37,-270 655.37,-264 661.37,-264 661.37,-264 925.37,-264 925.37,-264 931.37,-264 937.37,-270 937.37,-276 937.37,-276 937.37,-288 937.37,-288 937.37,-294 931.37,-300 925.37,-300"/>
-<text text-anchor="middle" x="793.37" y="-278.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefixNorVersions</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Idle&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge3" class="edge">
-<title>NotSkippingPrefixNorVersions.Idle&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M793.37,-350.8C793.37,-339.16 793.37,-323.55 793.37,-310.24"/>
-<polygon fill="black" stroke="black" points="796.87,-310.18 793.37,-300.18 789.87,-310.18 796.87,-310.18"/>
-<text text-anchor="middle" x="851.37" y="-321.8" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- SkippingPrefix.Idle -->
-<g id="node4" class="node">
-<title>SkippingPrefix.Idle</title>
-<path fill="lightgrey" stroke="black" d="M1209.37,-138C1209.37,-138 1017.37,-138 1017.37,-138 1011.37,-138 1005.37,-132 1005.37,-126 1005.37,-126 1005.37,-114 1005.37,-114 1005.37,-108 1011.37,-102 1017.37,-102 1017.37,-102 1209.37,-102 1209.37,-102 1215.37,-102 1221.37,-108 1221.37,-114 1221.37,-114 1221.37,-126 1221.37,-126 1221.37,-132 1215.37,-138 1209.37,-138"/>
-<text text-anchor="middle" x="1113.37" y="-116.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Processing -->
-<g id="node8" class="node">
-<title>SkippingPrefix.Processing</title>
-<path fill="lightblue" stroke="black" d="M1070.37,-36C1070.37,-36 878.37,-36 878.37,-36 872.37,-36 866.37,-30 866.37,-24 866.37,-24 866.37,-12 866.37,-12 866.37,-6 872.37,0 878.37,0 878.37,0 1070.37,0 1070.37,0 1076.37,0 1082.37,-6 1082.37,-12 1082.37,-12 1082.37,-24 1082.37,-24 1082.37,-30 1076.37,-36 1070.37,-36"/>
-<text text-anchor="middle" x="974.37" y="-14.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing -->
-<g id="edge4" class="edge">
-<title>SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M1011.89,-101.96C994.96,-97.13 981.04,-91.17 975.37,-84 967.11,-73.56 966.25,-58.93 967.72,-46.2"/>
-<polygon fill="black" stroke="black" points="971.22,-46.52 969.4,-36.09 964.31,-45.38 971.22,-46.52"/>
-<text text-anchor="middle" x="1033.37" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- SkippingVersions.Processing -->
-<g id="node9" class="node">
-<title>SkippingVersions.Processing</title>
-<path fill="lightblue" stroke="black" d="M381.37,-36C381.37,-36 189.37,-36 189.37,-36 183.37,-36 177.37,-30 177.37,-24 177.37,-24 177.37,-12 177.37,-12 177.37,-6 183.37,0 189.37,0 189.37,0 381.37,0 381.37,0 387.37,0 393.37,-6 393.37,-12 393.37,-12 393.37,-24 393.37,-24 393.37,-30 387.37,-36 381.37,-36"/>
-<text text-anchor="middle" x="285.37" y="-14.2" font-family="Times,serif" font-size="16.00">SkippingVersions</text>
-</g>
-<!-- SkippingVersions.Idle&#45;&gt;SkippingVersions.Processing -->
-<g id="edge5" class="edge">
-<title>SkippingVersions.Idle&#45;&gt;SkippingVersions.Processing</title>
-<path fill="none" stroke="black" d="M141.4,-101.91C138.35,-87.58 136.8,-67.37 147.37,-54 151.89,-48.28 161.64,-43.34 173.99,-39.12"/>
-<polygon fill="black" stroke="black" points="175.39,-42.36 183.89,-36.04 173.3,-35.67 175.39,-42.36"/>
-<text text-anchor="middle" x="205.37" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- WaitVersionAfterPHD.Idle -->
-<g id="node6" class="node">
-<title>WaitVersionAfterPHD.Idle</title>
-<path fill="lightgrey" stroke="black" d="M1534.37,-138C1534.37,-138 1342.37,-138 1342.37,-138 1336.37,-138 1330.37,-132 1330.37,-126 1330.37,-126 1330.37,-114 1330.37,-114 1330.37,-108 1336.37,-102 1342.37,-102 1342.37,-102 1534.37,-102 1534.37,-102 1540.37,-102 1546.37,-108 1546.37,-114 1546.37,-114 1546.37,-126 1546.37,-126 1546.37,-132 1540.37,-138 1534.37,-138"/>
-<text text-anchor="middle" x="1438.37" y="-116.2" font-family="Times,serif" font-size="16.00">WaitVersionAfterPHD</text>
-</g>
-<!-- WaitVersionAfterPHD.Processing -->
-<g id="node10" class="node">
-<title>WaitVersionAfterPHD.Processing</title>
-<path fill="lightblue" stroke="black" d="M1534.37,-36C1534.37,-36 1342.37,-36 1342.37,-36 1336.37,-36 1330.37,-30 1330.37,-24 1330.37,-24 1330.37,-12 1330.37,-12 1330.37,-6 1336.37,0 1342.37,0 1342.37,0 1534.37,0 1534.37,0 1540.37,0 1546.37,-6 1546.37,-12 1546.37,-12 1546.37,-24 1546.37,-24 1546.37,-30 1540.37,-36 1534.37,-36"/>
-<text text-anchor="middle" x="1438.37" y="-14.2" font-family="Times,serif" font-size="16.00">WaitVersionAfterPHD</text>
-</g>
-<!-- WaitVersionAfterPHD.Idle&#45;&gt;WaitVersionAfterPHD.Processing -->
-<g id="edge6" class="edge">
-<title>WaitVersionAfterPHD.Idle&#45;&gt;WaitVersionAfterPHD.Processing</title>
-<path fill="none" stroke="black" d="M1438.37,-101.58C1438.37,-86.38 1438.37,-64.07 1438.37,-46.46"/>
-<polygon fill="black" stroke="black" points="1441.87,-46.22 1438.37,-36.22 1434.87,-46.22 1441.87,-46.22"/>
-<text text-anchor="middle" x="1496.37" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;END -->
-<g id="edge10" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;END</title>
-<path fill="none" stroke="black" d="M649.15,-273.62C611.7,-268.54 578.44,-260.07 566.37,-246 540.33,-215.64 540,-186.08 566.37,-156 586.46,-133.07 673.88,-148.86 702.37,-138 705.22,-136.91 708.06,-135.44 710.76,-133.82"/>
-<polygon fill="black" stroke="black" points="712.88,-136.61 719.13,-128.05 708.91,-130.84 712.88,-136.61"/>
-<text text-anchor="middle" x="672.87" y="-212.3" font-family="Times,serif" font-size="14.00">[isListableKey(key, value) and</text>
-<text text-anchor="middle" x="672.87" y="-197.3" font-family="Times,serif" font-size="14.00">Keys == maxKeys]</text>
-<text text-anchor="middle" x="672.87" y="-182.3" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_END</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge9" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M937.6,-274.31C1018.89,-269.01 1106.69,-260.11 1119.37,-246 1143.16,-219.51 1134.03,-175.72 1124.38,-147.62"/>
-<polygon fill="black" stroke="black" points="1127.6,-146.22 1120.86,-138.04 1121.03,-148.64 1127.6,-146.22"/>
-<text text-anchor="middle" x="1254.37" y="-212.3" font-family="Times,serif" font-size="14.00">[key.startsWith(&lt;ReplayPrefix&gt;)]</text>
-<text text-anchor="middle" x="1254.37" y="-197.3" font-family="Times,serif" font-size="14.00">/ prefix &lt;&#45; &lt;ReplayPrefix&gt;</text>
-<text text-anchor="middle" x="1254.37" y="-182.3" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge11" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M799.18,-263.65C800.96,-258.05 802.85,-251.79 804.37,-246 814.73,-206.45 793.03,-183.41 823.37,-156 851.23,-130.83 954.1,-142.59 991.37,-138 992.65,-137.84 993.94,-137.68 995.24,-137.52"/>
-<polygon fill="black" stroke="black" points="995.81,-140.98 1005.29,-136.25 994.93,-134.03 995.81,-140.98"/>
-<text text-anchor="middle" x="969.37" y="-234.8" font-family="Times,serif" font-size="14.00">[isListableKey(key, value) and</text>
-<text text-anchor="middle" x="969.37" y="-219.8" font-family="Times,serif" font-size="14.00">nKeys &lt; maxKeys and</text>
-<text text-anchor="middle" x="969.37" y="-204.8" font-family="Times,serif" font-size="14.00">hasDelimiter(key)]</text>
-<text text-anchor="middle" x="969.37" y="-189.8" font-family="Times,serif" font-size="14.00">/ prefix &lt;&#45; prefixOf(key)</text>
-<text text-anchor="middle" x="969.37" y="-174.8" font-family="Times,serif" font-size="14.00">/ CommonPrefixes.append(prefixOf(key))</text>
-<text text-anchor="middle" x="969.37" y="-159.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle -->
-<g id="edge7" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M649.11,-279.23C439.56,-275.94 73.58,-267.19 53.37,-246 25.76,-217.06 30.6,-188.89 53.37,-156 56.56,-151.39 60.44,-147.39 64.78,-143.91"/>
-<polygon fill="black" stroke="black" points="66.8,-146.76 73.04,-138.2 62.83,-141 66.8,-146.76"/>
-<text text-anchor="middle" x="167.87" y="-204.8" font-family="Times,serif" font-size="14.00">[Version.isDeleteMarker(value)]</text>
-<text text-anchor="middle" x="167.87" y="-189.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle -->
-<g id="edge12" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M649.33,-279.1C514.97,-275.99 331.4,-267.75 305.37,-246 273.69,-219.53 311.53,-185.22 282.37,-156 276.73,-150.36 270.32,-145.59 263.42,-141.56"/>
-<polygon fill="black" stroke="black" points="264.92,-138.39 254.44,-136.84 261.67,-144.59 264.92,-138.39"/>
-<text text-anchor="middle" x="411.87" y="-227.3" font-family="Times,serif" font-size="14.00">[isListableKey(key, value) and</text>
-<text text-anchor="middle" x="411.87" y="-212.3" font-family="Times,serif" font-size="14.00">nKeys &lt; maxKeys and</text>
-<text text-anchor="middle" x="411.87" y="-197.3" font-family="Times,serif" font-size="14.00">not hasDelimiter(key)]</text>
-<text text-anchor="middle" x="411.87" y="-182.3" font-family="Times,serif" font-size="14.00">/ Contents.append(key, value)</text>
-<text text-anchor="middle" x="411.87" y="-167.3" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefixNorVersions.Processing&#45;&gt;WaitVersionAfterPHD.Idle -->
-<g id="edge8" class="edge">
-<title>NotSkippingPrefixNorVersions.Processing&#45;&gt;WaitVersionAfterPHD.Idle</title>
-<path fill="none" stroke="black" d="M937.38,-280.87C1099.43,-279.42 1344.59,-272.74 1378.37,-246 1411.11,-220.08 1384.48,-192.16 1405.37,-156 1407.38,-152.52 1409.8,-149.11 1412.4,-145.87"/>
-<polygon fill="black" stroke="black" points="1415.16,-148.04 1419.13,-138.21 1409.9,-143.41 1415.16,-148.04"/>
-<text text-anchor="middle" x="1486.87" y="-204.8" font-family="Times,serif" font-size="14.00">[Version.isPHD(value)]</text>
-<text text-anchor="middle" x="1486.87" y="-189.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge13" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M1064.61,-36.08C1074.44,-40.7 1083.66,-46.57 1091.37,-54 1101.65,-63.92 1107.13,-78.81 1110.04,-91.84"/>
-<polygon fill="black" stroke="black" points="1106.62,-92.56 1111.88,-101.76 1113.5,-91.29 1106.62,-92.56"/>
-<text text-anchor="middle" x="1190.37" y="-72.8" font-family="Times,serif" font-size="14.00">[key.startsWith(prefix)]</text>
-<text text-anchor="middle" x="1190.37" y="-57.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge14" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M899.82,-36.01C864.18,-48.2 824.54,-68.57 802.37,-102 771.84,-148.02 779.31,-216.26 786.77,-253.8"/>
-<polygon fill="black" stroke="black" points="783.43,-254.92 788.94,-263.97 790.28,-253.46 783.43,-254.92"/>
-<text text-anchor="middle" x="899.37" y="-116.3" font-family="Times,serif" font-size="14.00">[not key.startsWith(prefix)]</text>
-</g>
-<!-- SkippingVersions.Processing&#45;&gt;SkippingVersions.Idle -->
-<g id="edge15" class="edge">
-<title>SkippingVersions.Processing&#45;&gt;SkippingVersions.Idle</title>
-<path fill="none" stroke="black" d="M283.88,-36.24C281.71,-50.87 276.4,-71.43 263.37,-84 258.07,-89.11 252.06,-93.48 245.62,-97.21"/>
-<polygon fill="black" stroke="black" points="243.85,-94.19 236.61,-101.92 247.09,-100.39 243.85,-94.19"/>
-<text text-anchor="middle" x="349.87" y="-72.8" font-family="Times,serif" font-size="14.00">[isVersionKey(key)]</text>
-<text text-anchor="middle" x="349.87" y="-57.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- SkippingVersions.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge16" class="edge">
-<title>SkippingVersions.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M382.46,-36.08C396.72,-40.7 410.82,-46.57 423.37,-54 476.67,-85.57 487.28,-102.42 518.37,-156 539.39,-192.23 514.46,-218.85 546.37,-246 561.72,-259.06 598.56,-267.25 639.23,-272.39"/>
-<polygon fill="black" stroke="black" points="639.01,-275.89 649.36,-273.59 639.84,-268.93 639.01,-275.89"/>
-<text text-anchor="middle" x="590.37" y="-116.3" font-family="Times,serif" font-size="14.00">[not isVersionKey(key)]</text>
-</g>
-<!-- WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge17" class="edge">
-<title>WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M1536.41,-36.13C1544.73,-40.79 1552.27,-46.65 1558.37,-54 1585.64,-86.89 1597.89,-215.12 1568.37,-246 1547.29,-268.05 1167.71,-276.42 947.74,-279.43"/>
-<polygon fill="black" stroke="black" points="947.67,-275.93 937.71,-279.57 947.76,-282.93 947.67,-275.93"/>
-<text text-anchor="middle" x="1758.37" y="-123.8" font-family="Times,serif" font-size="14.00">[isVersionKey(key) and master(key) == PHDkey]</text>
-<text text-anchor="middle" x="1758.37" y="-108.8" font-family="Times,serif" font-size="14.00">/ key &lt;&#45; master(key)</text>
-</g>
-<!-- WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing -->
-<g id="edge18" class="edge">
-<title>WaitVersionAfterPHD.Processing&#45;&gt;NotSkippingPrefixNorVersions.Processing</title>
-<path fill="none" stroke="black" d="M1546.51,-21.25C1677.94,-26.54 1888.29,-44.09 1937.37,-102 1947.71,-114.21 1946.85,-125.11 1937.37,-138 1841.62,-268.08 1749.48,-218.23 1590.37,-246 1471.26,-266.79 1143.92,-275.5 947.77,-278.94"/>
-<polygon fill="black" stroke="black" points="947.6,-275.44 937.66,-279.11 947.72,-282.44 947.6,-275.44"/>
-<text text-anchor="middle" x="2124.87" y="-116.3" font-family="Times,serif" font-size="14.00">[not isVersionKey(key) or master(key) != PHDkey]</text>
-</g>
-</g>
-</svg>
--- a/documentation/listingAlgos/pics/delimiterStateChart.dot
+++ b/documentation/listingAlgos/pics/delimiterStateChart.dot
@ -1,35 +0,0 @@
-digraph {
-  node [shape="box",style="filled,rounded",fontsize=16,fixedsize=true,width=3];
-  edge [fontsize=14];
-  rankdir=TB;
-
-  START [shape="circle",width=0.2,label="",style="filled",fillcolor="black"]
-  END [shape="circle",width=0.2,label="",style="filled",fillcolor="black",peripheries=2]
-
-  node [fillcolor="lightgrey"];
-  "NotSkipping.Idle" [label="NotSkipping",group="NotSkipping"];
-  "NeverSkipping.Idle" [label="NeverSkipping",group="NeverSkipping"];
-  "NotSkippingPrefix.Idle" [label="NotSkippingPrefix",group="NotSkippingPrefix"];
-  "SkippingPrefix.Idle" [label="SkippingPrefix",group="SkippingPrefix"];
-
-  node [fillcolor="lightblue"];
-  "NeverSkipping.Processing" [label="NeverSkipping",group="NeverSkipping"];
-  "NotSkippingPrefix.Processing" [label="NotSkippingPrefix",group="NotSkippingPrefix"];
-  "SkippingPrefix.Processing" [label="SkippingPrefix",group="SkippingPrefix"];
-
-  START -> "NotSkipping.Idle"
-  "NotSkipping.Idle" -> "NeverSkipping.Idle" [label="[delimiter == undefined]"]
-  "NotSkipping.Idle" -> "NotSkippingPrefix.Idle" [label="[delimiter == '/']"]
-
-  "NeverSkipping.Idle" -> "NeverSkipping.Processing" [label="filter(key, value)"]
-  "NotSkippingPrefix.Idle" -> "NotSkippingPrefix.Processing" [label="filter(key, value)"]
-  "SkippingPrefix.Idle" -> "SkippingPrefix.Processing" [label="filter(key, value)"]
-
-  "NeverSkipping.Processing" -> END [label="[nKeys == maxKeys]\n-> FILTER_END"]
-  "NeverSkipping.Processing" -> "NeverSkipping.Idle" [label="[nKeys < maxKeys]\n/ Contents.append(key, value)\n -> FILTER_ACCEPT"]
-  "NotSkippingPrefix.Processing" -> END [label="[nKeys == maxKeys]\n -> FILTER_END"]
-  "NotSkippingPrefix.Processing" -> "SkippingPrefix.Idle" [label="[nKeys < maxKeys and hasDelimiter(key)]\n/ prefix <- prefixOf(key)\n/ CommonPrefixes.append(prefixOf(key))\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefix.Processing" -> "NotSkippingPrefix.Idle" [label="[nKeys < maxKeys and not hasDelimiter(key)]\n/ Contents.append(key, value)\n -> FILTER_ACCEPT"]
-  "SkippingPrefix.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(prefix)]\n-> FILTER_SKIP"]
-  "SkippingPrefix.Processing" -> "NotSkippingPrefix.Processing" [label="[not key.startsWith(prefix)]"]
-}
--- a/documentation/listingAlgos/pics/delimiterStateChart.svg
+++ b/documentation/listingAlgos/pics/delimiterStateChart.svg
@ -1,166 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: %3 Pages: 1 -->
-<svg width="975pt" height="533pt"
- viewBox="0.00 0.00 975.00 533.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 529)">
-<title>%3</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-529 971,-529 971,4 -4,4"/>
-<!-- START -->
-<g id="node1" class="node">
-<title>START</title>
-<ellipse fill="black" stroke="black" cx="283" cy="-518" rx="7" ry="7"/>
-</g>
-<!-- NotSkipping.Idle -->
-<g id="node3" class="node">
-<title>NotSkipping.Idle</title>
-<path fill="lightgrey" stroke="black" d="M379,-474C379,-474 187,-474 187,-474 181,-474 175,-468 175,-462 175,-462 175,-450 175,-450 175,-444 181,-438 187,-438 187,-438 379,-438 379,-438 385,-438 391,-444 391,-450 391,-450 391,-462 391,-462 391,-468 385,-474 379,-474"/>
-<text text-anchor="middle" x="283" y="-452.2" font-family="Times,serif" font-size="16.00">NotSkipping</text>
-</g>
-<!-- START&#45;&gt;NotSkipping.Idle -->
-<g id="edge1" class="edge">
-<title>START&#45;&gt;NotSkipping.Idle</title>
-<path fill="none" stroke="black" d="M283,-510.58C283,-504.23 283,-494.07 283,-484.3"/>
-<polygon fill="black" stroke="black" points="286.5,-484.05 283,-474.05 279.5,-484.05 286.5,-484.05"/>
-</g>
-<!-- END -->
-<g id="node2" class="node">
-<title>END</title>
-<ellipse fill="black" stroke="black" cx="196" cy="-120" rx="7" ry="7"/>
-<ellipse fill="none" stroke="black" cx="196" cy="-120" rx="11" ry="11"/>
-</g>
-<!-- NeverSkipping.Idle -->
-<g id="node4" class="node">
-<title>NeverSkipping.Idle</title>
-<path fill="lightgrey" stroke="black" d="M262,-387C262,-387 70,-387 70,-387 64,-387 58,-381 58,-375 58,-375 58,-363 58,-363 58,-357 64,-351 70,-351 70,-351 262,-351 262,-351 268,-351 274,-357 274,-363 274,-363 274,-375 274,-375 274,-381 268,-387 262,-387"/>
-<text text-anchor="middle" x="166" y="-365.2" font-family="Times,serif" font-size="16.00">NeverSkipping</text>
-</g>
-<!-- NotSkipping.Idle&#45;&gt;NeverSkipping.Idle -->
-<g id="edge2" class="edge">
-<title>NotSkipping.Idle&#45;&gt;NeverSkipping.Idle</title>
-<path fill="none" stroke="black" d="M216.5,-437.82C206.51,-433.18 196.91,-427.34 189,-420 182.25,-413.74 177.33,-405.11 173.81,-396.79"/>
-<polygon fill="black" stroke="black" points="177.05,-395.47 170.3,-387.31 170.49,-397.9 177.05,-395.47"/>
-<text text-anchor="middle" x="279.5" y="-408.8" font-family="Times,serif" font-size="14.00">[delimiter == undefined]</text>
-</g>
-<!-- NotSkippingPrefix.Idle -->
-<g id="node5" class="node">
-<title>NotSkippingPrefix.Idle</title>
-<path fill="lightgrey" stroke="black" d="M496,-387C496,-387 304,-387 304,-387 298,-387 292,-381 292,-375 292,-375 292,-363 292,-363 292,-357 298,-351 304,-351 304,-351 496,-351 496,-351 502,-351 508,-357 508,-363 508,-363 508,-375 508,-375 508,-381 502,-387 496,-387"/>
-<text text-anchor="middle" x="400" y="-365.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefix</text>
-</g>
-<!-- NotSkipping.Idle&#45;&gt;NotSkippingPrefix.Idle -->
-<g id="edge3" class="edge">
-<title>NotSkipping.Idle&#45;&gt;NotSkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M340.77,-437.93C351.2,-433.2 361.45,-427.29 370,-420 377.58,-413.53 383.76,-404.65 388.51,-396.16"/>
-<polygon fill="black" stroke="black" points="391.63,-397.74 393.08,-387.24 385.4,-394.54 391.63,-397.74"/>
-<text text-anchor="middle" x="442.5" y="-408.8" font-family="Times,serif" font-size="14.00">[delimiter == &#39;/&#39;]</text>
-</g>
-<!-- NeverSkipping.Processing -->
-<g id="node7" class="node">
-<title>NeverSkipping.Processing</title>
-<path fill="lightblue" stroke="black" d="M204,-270C204,-270 12,-270 12,-270 6,-270 0,-264 0,-258 0,-258 0,-246 0,-246 0,-240 6,-234 12,-234 12,-234 204,-234 204,-234 210,-234 216,-240 216,-246 216,-246 216,-258 216,-258 216,-264 210,-270 204,-270"/>
-<text text-anchor="middle" x="108" y="-248.2" font-family="Times,serif" font-size="16.00">NeverSkipping</text>
-</g>
-<!-- NeverSkipping.Idle&#45;&gt;NeverSkipping.Processing -->
-<g id="edge4" class="edge">
-<title>NeverSkipping.Idle&#45;&gt;NeverSkipping.Processing</title>
-<path fill="none" stroke="black" d="M64.1,-350.93C47.33,-346.11 33.58,-340.17 28,-333 15.72,-317.21 17.05,-304.74 28,-288 30.93,-283.52 34.58,-279.6 38.69,-276.19"/>
-<polygon fill="black" stroke="black" points="40.97,-278.86 47.1,-270.22 36.92,-273.16 40.97,-278.86"/>
-<text text-anchor="middle" x="86" y="-306.8" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- NotSkippingPrefix.Processing -->
-<g id="node8" class="node">
-<title>NotSkippingPrefix.Processing</title>
-<path fill="lightblue" stroke="black" d="M554,-270C554,-270 362,-270 362,-270 356,-270 350,-264 350,-258 350,-258 350,-246 350,-246 350,-240 356,-234 362,-234 362,-234 554,-234 554,-234 560,-234 566,-240 566,-246 566,-246 566,-258 566,-258 566,-264 560,-270 554,-270"/>
-<text text-anchor="middle" x="458" y="-248.2" font-family="Times,serif" font-size="16.00">NotSkippingPrefix</text>
-</g>
-<!-- NotSkippingPrefix.Idle&#45;&gt;NotSkippingPrefix.Processing -->
-<g id="edge5" class="edge">
-<title>NotSkippingPrefix.Idle&#45;&gt;NotSkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M395.69,-350.84C392.38,-333.75 390.03,-307.33 401,-288 403.42,-283.74 406.58,-279.94 410.19,-276.55"/>
-<polygon fill="black" stroke="black" points="412.5,-279.18 418.1,-270.18 408.11,-273.73 412.5,-279.18"/>
-<text text-anchor="middle" x="459" y="-306.8" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- SkippingPrefix.Idle -->
-<g id="node6" class="node">
-<title>SkippingPrefix.Idle</title>
-<path fill="lightgrey" stroke="black" d="M554,-138C554,-138 362,-138 362,-138 356,-138 350,-132 350,-126 350,-126 350,-114 350,-114 350,-108 356,-102 362,-102 362,-102 554,-102 554,-102 560,-102 566,-108 566,-114 566,-114 566,-126 566,-126 566,-132 560,-138 554,-138"/>
-<text text-anchor="middle" x="458" y="-116.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Processing -->
-<g id="node9" class="node">
-<title>SkippingPrefix.Processing</title>
-<path fill="lightblue" stroke="black" d="M691,-36C691,-36 499,-36 499,-36 493,-36 487,-30 487,-24 487,-24 487,-12 487,-12 487,-6 493,0 499,0 499,0 691,0 691,0 697,0 703,-6 703,-12 703,-12 703,-24 703,-24 703,-30 697,-36 691,-36"/>
-<text text-anchor="middle" x="595" y="-14.2" font-family="Times,serif" font-size="16.00">SkippingPrefix</text>
-</g>
-<!-- SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing -->
-<g id="edge6" class="edge">
-<title>SkippingPrefix.Idle&#45;&gt;SkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M452.35,-101.95C448.76,-87.65 446.54,-67.45 457,-54 461.44,-48.29 471.08,-43.36 483.3,-39.15"/>
-<polygon fill="black" stroke="black" points="484.61,-42.41 493.1,-36.07 482.51,-35.73 484.61,-42.41"/>
-<text text-anchor="middle" x="515" y="-65.3" font-family="Times,serif" font-size="14.00">filter(key, value)</text>
-</g>
-<!-- NeverSkipping.Processing&#45;&gt;END -->
-<g id="edge7" class="edge">
-<title>NeverSkipping.Processing&#45;&gt;END</title>
-<path fill="none" stroke="black" d="M102.91,-233.88C97.93,-213.45 93.18,-179.15 109,-156 123.79,-134.35 154.41,-126.09 175.08,-122.94"/>
-<polygon fill="black" stroke="black" points="175.62,-126.4 185.11,-121.69 174.76,-119.45 175.62,-126.4"/>
-<text text-anchor="middle" x="185" y="-189.8" font-family="Times,serif" font-size="14.00">[nKeys == maxKeys]</text>
-<text text-anchor="middle" x="185" y="-174.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_END</text>
-</g>
-<!-- NeverSkipping.Processing&#45;&gt;NeverSkipping.Idle -->
-<g id="edge8" class="edge">
-<title>NeverSkipping.Processing&#45;&gt;NeverSkipping.Idle</title>
-<path fill="none" stroke="black" d="M129.49,-270.27C134.87,-275.48 140.18,-281.55 144,-288 153.56,-304.17 159.09,-324.63 162.21,-340.81"/>
-<polygon fill="black" stroke="black" points="158.78,-341.49 163.94,-350.74 165.68,-340.29 158.78,-341.49"/>
-<text text-anchor="middle" x="265.5" y="-321.8" font-family="Times,serif" font-size="14.00">[nKeys &lt; maxKeys]</text>
-<text text-anchor="middle" x="265.5" y="-306.8" font-family="Times,serif" font-size="14.00">/ Contents.append(key, value)</text>
-<text text-anchor="middle" x="265.5" y="-291.8" font-family="Times,serif" font-size="14.00"> &#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefix.Processing&#45;&gt;END -->
-<g id="edge9" class="edge">
-<title>NotSkippingPrefix.Processing&#45;&gt;END</title>
-<path fill="none" stroke="black" d="M349.96,-237.93C333,-232.81 316.36,-225.74 302,-216 275.27,-197.87 285.01,-177.6 261,-156 247.64,-143.98 229.41,-134.62 215.65,-128.62"/>
-<polygon fill="black" stroke="black" points="216.74,-125.28 206.16,-124.7 214.07,-131.75 216.74,-125.28"/>
-<text text-anchor="middle" x="378" y="-189.8" font-family="Times,serif" font-size="14.00">[nKeys == maxKeys]</text>
-<text text-anchor="middle" x="378" y="-174.8" font-family="Times,serif" font-size="14.00"> &#45;&gt; FILTER_END</text>
-</g>
-<!-- NotSkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Idle -->
-<g id="edge11" class="edge">
-<title>NotSkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M499.64,-270.11C506.59,-274.86 512.87,-280.76 517,-288 526.9,-305.38 528.94,-316.96 517,-333 513.56,-337.62 509.53,-341.66 505.07,-345.18"/>
-<polygon fill="black" stroke="black" points="502.89,-342.43 496.63,-350.98 506.85,-348.2 502.89,-342.43"/>
-<text text-anchor="middle" x="690.5" y="-321.8" font-family="Times,serif" font-size="14.00">[nKeys &lt; maxKeys and not hasDelimiter(key)]</text>
-<text text-anchor="middle" x="690.5" y="-306.8" font-family="Times,serif" font-size="14.00">/ Contents.append(key, value)</text>
-<text text-anchor="middle" x="690.5" y="-291.8" font-family="Times,serif" font-size="14.00"> &#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- NotSkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge10" class="edge">
-<title>NotSkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M458,-233.74C458,-211.98 458,-174.32 458,-148.56"/>
-<polygon fill="black" stroke="black" points="461.5,-148.33 458,-138.33 454.5,-148.33 461.5,-148.33"/>
-<text text-anchor="middle" x="609.5" y="-204.8" font-family="Times,serif" font-size="14.00">[nKeys &lt; maxKeys and hasDelimiter(key)]</text>
-<text text-anchor="middle" x="609.5" y="-189.8" font-family="Times,serif" font-size="14.00">/ prefix &lt;&#45; prefixOf(key)</text>
-<text text-anchor="middle" x="609.5" y="-174.8" font-family="Times,serif" font-size="14.00">/ CommonPrefixes.append(prefixOf(key))</text>
-<text text-anchor="middle" x="609.5" y="-159.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_ACCEPT</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle -->
-<g id="edge12" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;SkippingPrefix.Idle</title>
-<path fill="none" stroke="black" d="M593.49,-36.23C591.32,-50.84 586,-71.39 573,-84 567.75,-89.09 561.77,-93.45 555.38,-97.17"/>
-<polygon fill="black" stroke="black" points="553.66,-94.12 546.43,-101.87 556.91,-100.32 553.66,-94.12"/>
-<text text-anchor="middle" x="672" y="-72.8" font-family="Times,serif" font-size="14.00">[key.startsWith(prefix)]</text>
-<text text-anchor="middle" x="672" y="-57.8" font-family="Times,serif" font-size="14.00">&#45;&gt; FILTER_SKIP</text>
-</g>
-<!-- SkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Processing -->
-<g id="edge13" class="edge">
-<title>SkippingPrefix.Processing&#45;&gt;NotSkippingPrefix.Processing</title>
-<path fill="none" stroke="black" d="M703.16,-31.64C728.6,-36.87 750.75,-44.11 759,-54 778.46,-77.34 776.26,-200.01 762,-216 749.37,-230.17 656.13,-239.42 576.2,-244.84"/>
-<polygon fill="black" stroke="black" points="575.77,-241.36 566.03,-245.51 576.24,-248.34 575.77,-241.36"/>
-<text text-anchor="middle" x="870" y="-116.3" font-family="Times,serif" font-size="14.00">[not key.startsWith(prefix)]</text>
-</g>
-</g>
-</svg>
--- a/greenkeeper.json
+++ b/greenkeeper.json
@ -1,28 +0,0 @@
-{
-  "groups": {
-    "default": {
-      "packages": [
-        "lib/executables/pensieveCreds/package.json",
-        "package.json"
-      ]
-    }
-  },
-  "branchPrefix": "improvement/greenkeeper.io/",
-  "commitMessages": {
-    "initialBadge": "docs(readme): add Greenkeeper badge",
-    "initialDependencies": "chore(package): update dependencies",
-    "initialBranches": "chore(bert-e): whitelist greenkeeper branches",
-    "dependencyUpdate": "fix(package): update ${dependency} to version ${version}",
-    "devDependencyUpdate": "chore(package): update ${dependency} to version ${version}",
-    "dependencyPin": "fix: pin ${dependency} to ${oldVersionResolved}",
-    "devDependencyPin": "chore: pin ${dependency} to ${oldVersionResolved}",
-    "closes": "\n\nCloses #${number}"
-  },
-  "ignore": [
-    "ajv",
-    "eslint",
-    "eslint-plugin-react",
-    "eslint-config-airbnb",
-    "eslint-config-scality"
-  ]
-}
--- a/index.ts
+++ b/index.ts
@ -1,19 +1,14 @@
 import * as evaluators from './lib/policyEvaluator/evaluator';
 import evaluatePrincipal from './lib/policyEvaluator/principal';
-import RequestContext, {
-    actionNeedQuotaCheck,
-    actionNeedQuotaCheckCopy,
-    actionWithDataDeletion } from './lib/policyEvaluator/RequestContext';
+import RequestContext from './lib/policyEvaluator/RequestContext';
 import * as requestUtils from './lib/policyEvaluator/requestUtils';
 import * as actionMaps from './lib/policyEvaluator/utils/actionMaps';
 import { validateUserPolicy } from './lib/policy/policyValidator'
-import * as locationConstraints from './lib/patches/locationConstraints';
 import * as userMetadata from './lib/s3middleware/userMetadata';
 import convertToXml from './lib/s3middleware/convertToXml';
 import escapeForXml from './lib/s3middleware/escapeForXml';
 import * as objectLegalHold from './lib/s3middleware/objectLegalHold';
 import * as tagging from './lib/s3middleware/tagging';
-import { checkDateModifiedHeaders } from './lib/s3middleware/validateConditionalHeaders';
 import { validateConditionalHeaders } from './lib/s3middleware/validateConditionalHeaders';
 import MD5Sum from './lib/s3middleware/MD5Sum';
 import NullStream from './lib/s3middleware/nullStream';
@ -21,14 +16,11 @@ import * as objectUtils from './lib/s3middleware/objectUtils';
 import * as mpuUtils from './lib/s3middleware/azureHelpers/mpuUtils';
 import ResultsCollector from './lib/s3middleware/azureHelpers/ResultsCollector';
 import SubStreamInterface from './lib/s3middleware/azureHelpers/SubStreamInterface';
-import { prepareStream } from './lib/s3middleware/prepareStream';
 import * as processMpuParts from './lib/s3middleware/processMpuParts';
 import * as retention from './lib/s3middleware/objectRetention';
-import * as objectRestore from './lib/s3middleware/objectRestore';
 import * as lifecycleHelpers from './lib/s3middleware/lifecycleHelpers';
 export { default as errors } from './lib/errors';
 export { default as Clustering } from './lib/Clustering';
-export * as ClusterRPC from './lib/clustering/ClusterRPC';
 export * as ipCheck from './lib/ipCheck';
 export * as auth from './lib/auth/auth';
 export * as constants from './lib/constants';
@ -41,19 +33,21 @@ export * as stream from './lib/stream';
 export * as jsutil from './lib/jsutil';
 export { default as stringHash } from './lib/stringHash';
 export * as db from './lib/db';
-export * as errorUtils from './lib/errorUtils';
 export { default as shuffle } from './lib/shuffle';
 export * as models from './lib/models';

 export const algorithms = {
-    list: require('./lib/algos/list/exportAlgos'),
+    list: {
+        Basic: require('./lib/algos/list/basic').List,
+        Delimiter: require('./lib/algos/list/delimiter').Delimiter,
+        DelimiterVersions: require('./lib/algos/list/delimiterVersions').DelimiterVersions,
+        DelimiterMaster: require('./lib/algos/list/delimiterMaster').DelimiterMaster,
+        MPU: require('./lib/algos/list/MPU').MultipartUploads,
+    },
    listTools: {
        DelimiterTools: require('./lib/algos/list/tools'),
-        Skip: require('./lib/algos/list/skip'),
    },
    cache: {
-        GapSet: require('./lib/algos/cache/GapSet'),
-        GapCache: require('./lib/algos/cache/GapCache'),
        LRUCache: require('./lib/algos/cache/LRUCache'),
    },
    stream: {
@ -70,9 +64,6 @@ export const policies = {
    RequestContext,
    requestUtils,
    actionMaps,
-    actionNeedQuotaCheck,
-    actionWithDataDeletion,
-    actionNeedQuotaCheckCopy,
 };

 export const testing = {
@ -85,7 +76,6 @@ export const s3middleware = {
    escapeForXml,
    objectLegalHold,
    tagging,
-    checkDateModifiedHeaders,
    validateConditionalHeaders,
    MD5Sum,
    NullStream,
@ -95,10 +85,8 @@ export const s3middleware = {
        ResultsCollector,
        SubStreamInterface,
    },
-    prepareStream,
    processMpuParts,
    retention,
-    objectRestore,
    lifecycleHelpers,
 };

@ -169,7 +157,3 @@ export const storage = {
 export const pensieve = {
    credentialUtils: require('./lib/executables/pensieveCreds/utils'),
 };
-
-export const patches = {
-    locationConstraints,
-};
--- a/lib/algos/cache/GapCache.ts
+++ b/lib/algos/cache/GapCache.ts
@ -1,363 +0,0 @@
-import { OrderedSet } from '@js-sdsl/ordered-set';
-import {
-    default as GapSet,
-    GapSetEntry,
-} from './GapSet';
-
-// the API is similar but is not strictly a superset of GapSetInterface
-// so we don't extend from it
-export interface GapCacheInterface {
-    exposureDelayMs: number;
-    maxGapWeight: number;
-    size: number;
-
-    setGap: (firstKey: string, lastKey: string, weight: number) => void;
-    removeOverlappingGaps: (overlappingKeys: string[]) => number;
-    lookupGap: (minKey: string, maxKey?: string) => Promise<GapSetEntry | null>;
-    [Symbol.iterator]: () => Iterator<GapSetEntry>;
-    toArray: () => GapSetEntry[];
-};
-
-class GapCacheUpdateSet {
-    newGaps: GapSet;
-    updatedKeys: OrderedSet<string>;
-
-    constructor(maxGapWeight: number) {
-        this.newGaps = new GapSet(maxGapWeight);
-        this.updatedKeys = new OrderedSet();
-    }
-
-    addUpdateBatch(updatedKeys: OrderedSet<string>): void {
-        this.updatedKeys.union(updatedKeys);
-    }
-};
-
-/**
- * Cache of listing "gaps" i.e. ranges of keys that can be skipped
- * over during listing (because they only contain delete markers as
- * latest versions).
- *
- * Typically, a single GapCache instance would be attached to a raft session.
- *
- * The API usage is as follows:
- *
- * - Initialize a GapCache instance by calling start() (this starts an internal timer)
- *
- * - Insert a gap or update an existing one via setGap()
- *
- * - Lookup existing gaps via lookupGap()
- *
- * - Invalidate gaps that overlap a specific set of keys via removeOverlappingGaps()
- *
- * - Shut down a GapCache instance by calling stop() (this stops the internal timer)
- *
- * Gaps inserted via setGap() are not exposed immediately to lookupGap(), but only:
- *
- * - after a certain delay always larger than 'exposureDelayMs' and usually shorter
- *   than twice this value (but might be slightly longer in rare cases)
- *
- * - and only if they haven't been invalidated by a recent call to removeOverlappingGaps()
- *
- * This ensures atomicity between gap creation and invalidation from updates under
- * the condition that a gap is created from first key to last key within the time defined
- * by 'exposureDelayMs'.
- *
- * The implementation is based on two extra temporary "update sets" on top of the main
- * exposed gap set, one called "staging" and the other "frozen", each containing a
- * temporary updated gap set and a list of updated keys to invalidate gaps with (coming
- * from calls to removeOverlappingGaps()). Every "exposureDelayMs" milliseconds, the frozen
- * gaps are invalidated by all key updates coming from either of the "staging" or "frozen"
- * update set, then merged into the exposed gaps set, after which the staging updates become
- * the frozen updates and won't receive any new gap until the next cycle.
- */
-export default class GapCache implements GapCacheInterface {
-    _exposureDelayMs: number;
-    maxGaps: number;
-
-    _stagingUpdates: GapCacheUpdateSet;
-    _frozenUpdates: GapCacheUpdateSet;
-    _exposedGaps: GapSet;
-    _exposeFrozenInterval: NodeJS.Timeout | null;
-
-    /**
-     * @constructor
-     *
-     * @param {number} exposureDelayMs - minimum delay between
-     * insertion of a gap via setGap() and its exposure via
-     * lookupGap()
-     * @param {number} maxGaps - maximum number of cached gaps, after
-     * which no new gap can be added by setGap(). (Note: a future
-     * improvement could replace this by an eviction strategy)
-     * @param {number} maxGapWeight - maximum "weight" of individual
-     * cached gaps, which is also the granularity for
-     * invalidation. Individual gaps can be chained together,
-     * which lookupGap() transparently consolidates in the response
-     * into a single large gap.
-     */
-    constructor(exposureDelayMs: number, maxGaps: number, maxGapWeight: number) {
-        this._exposureDelayMs = exposureDelayMs;
-        this.maxGaps = maxGaps;
-
-        this._stagingUpdates = new GapCacheUpdateSet(maxGapWeight);
-        this._frozenUpdates = new GapCacheUpdateSet(maxGapWeight);
-        this._exposedGaps = new GapSet(maxGapWeight);
-        this._exposeFrozenInterval = null;
-    }
-
-    /**
-     * Create a GapCache from an array of exposed gap entries (used in tests)
-     *
-     * @return {GapCache} - a new GapCache instance
-     */
-    static createFromArray(
-        gaps: GapSetEntry[],
-        exposureDelayMs: number,
-        maxGaps: number,
-        maxGapWeight: number
-    ): GapCache {
-        const gapCache = new GapCache(exposureDelayMs, maxGaps, maxGapWeight);
-        gapCache._exposedGaps = GapSet.createFromArray(gaps, maxGapWeight)
-        return gapCache;
-    }
-
-    /**
-     * Internal helper to remove gaps in the staging and frozen sets
-     * overlapping with previously updated keys, right before the
-     * frozen gaps get exposed.
-     *
-     * @return {undefined}
-     */
-    _removeOverlappingGapsBeforeExpose(): void {
-        for (const { updatedKeys } of [this._stagingUpdates, this._frozenUpdates]) {
-            if (updatedKeys.size() === 0) {
-                continue;
-            }
-            for (const { newGaps } of [this._stagingUpdates, this._frozenUpdates]) {
-                if (newGaps.size === 0) {
-                    continue;
-                }
-                newGaps.removeOverlappingGaps(updatedKeys);
-            }
-        }
-    }
-
-    /**
-     * This function is the core mechanism that updates the exposed gaps in the
-     * cache. It is called on a regular interval defined by 'exposureDelayMs'.
-     *
-     * It does the following in order:
-     *
-     * - remove gaps from the frozen set that overlap with any key present in a
-     *   batch passed to removeOverlappingGaps() since the last two triggers of
-     *   _exposeFrozen()
-     *
-     * - merge the remaining gaps from the frozen set to the exposed set, which
-     *   makes them visible from calls to lookupGap()
-     *
-     * - rotate by freezing the currently staging updates and initiating a new
-     *   staging updates set
-     *
-     * @return {undefined}
-     */
-    _exposeFrozen(): void {
-        this._removeOverlappingGapsBeforeExpose();
-        for (const gap of this._frozenUpdates.newGaps) {
-            // Use a trivial strategy to keep the cache size within
-            // limits: refuse to add new gaps when the size is above
-            // the 'maxGaps' threshold. We solely rely on
-            // removeOverlappingGaps() to make space for new gaps.
-            if (this._exposedGaps.size < this.maxGaps) {
-                this._exposedGaps.setGap(gap.firstKey, gap.lastKey, gap.weight);
-            }
-        }
-        this._frozenUpdates = this._stagingUpdates;
-        this._stagingUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-    }
-
-    /**
-     * Start the internal GapCache timer
-     *
-     * @return {undefined}
-     */
-    start(): void {
-        if (this._exposeFrozenInterval) {
-            return;
-        }
-        this._exposeFrozenInterval = setInterval(
-            () => this._exposeFrozen(),
-            this._exposureDelayMs);
-    }
-
-    /**
-     * Stop the internal GapCache timer
-     *
-     * @return {undefined}
-     */
-    stop(): void {
-        if (this._exposeFrozenInterval) {
-            clearInterval(this._exposeFrozenInterval);
-            this._exposeFrozenInterval = null;
-        }
-    }
-
-    /**
-     * Record a gap between two keys, associated with a weight to
-     * limit individual gap's spanning ranges in the cache, for a more
-     * granular invalidation.
-     *
-     * The function handles splitting and merging existing gaps to
-     * maintain an optimal weight of cache entries.
-     *
-     * NOTE 1: the caller must ensure that the full length of the gap
-     * between 'firstKey' and 'lastKey' has been built from a listing
-     * snapshot that is more recent than 'exposureDelayMs' milliseconds,
-     * in order to guarantee that the exposed gap will be fully
-     * covered (and potentially invalidated) from recent calls to
-     * removeOverlappingGaps().
-     *
-     * NOTE 2: a usual pattern when building a large gap from multiple
-     * calls to setGap() is to start the next gap from 'lastKey',
-     * which will be passed as 'firstKey' in the next call, so that
-     * gaps can be chained together and consolidated by lookupGap().
-     *
-     * @param {string} firstKey - first key of the gap
-     * @param {string} lastKey - last key of the gap, must be greater
-     * or equal than 'firstKey'
-     * @param {number} weight - total weight between 'firstKey' and 'lastKey'
-     * @return {undefined}
-     */
-    setGap(firstKey: string, lastKey: string, weight: number): void {
-        this._stagingUpdates.newGaps.setGap(firstKey, lastKey, weight);
-    }
-
-    /**
-     * Remove gaps that overlap with a given set of keys. Used to
-     * invalidate gaps when keys are inserted or deleted.
-     *
-     * @param {OrderedSet<string> | string[]} overlappingKeys - remove gaps that
-     * overlap with any of this set of keys
-     * @return {number} - how many gaps were removed from the exposed
-     * gaps only (overlapping gaps not yet exposed are also invalidated
-     * but are not accounted for in the returned value)
-     */
-    removeOverlappingGaps(overlappingKeys: OrderedSet<string> | string[]): number {
-        let overlappingKeysSet;
-        if (Array.isArray(overlappingKeys)) {
-            overlappingKeysSet = new OrderedSet(overlappingKeys);
-        } else {
-            overlappingKeysSet = overlappingKeys;
-        }
-        this._stagingUpdates.addUpdateBatch(overlappingKeysSet);
-        return this._exposedGaps.removeOverlappingGaps(overlappingKeysSet);
-    }
-
-    /**
-     * Lookup the next exposed gap that overlaps with [minKey, maxKey]. Internally
-     * chained gaps are coalesced in the response into a single contiguous large gap.
-     *
-     * @param {string} minKey - minimum key overlapping with the returned gap
-     * @param {string} [maxKey] - maximum key overlapping with the returned gap
-     * @return {Promise<GapSetEntry | null>} - result of the lookup if a gap
-     *   was found, null otherwise, as a Promise
-     */
-    lookupGap(minKey: string, maxKey?: string): Promise<GapSetEntry | null> {
-        return this._exposedGaps.lookupGap(minKey, maxKey);
-    }
-
-    /**
-     * Get the maximum weight setting for individual gaps.
-     *
-     * @return {number} - maximum weight of individual gaps
-     */
-    get maxGapWeight(): number {
-        return this._exposedGaps.maxWeight;
-    }
-
-    /**
-     * Set the maximum weight setting for individual gaps.
-     *
-     * @param {number} gapWeight - maximum weight of individual gaps
-     */
-    set maxGapWeight(gapWeight: number) {
-        this._exposedGaps.maxWeight = gapWeight;
-        // also update transient gap sets
-        this._stagingUpdates.newGaps.maxWeight = gapWeight;
-        this._frozenUpdates.newGaps.maxWeight = gapWeight;
-    }
-
-    /**
-     * Get the exposure delay in milliseconds, which is the minimum
-     * time after which newly cached gaps will be exposed by
-     * lookupGap().
-     *
-     * @return {number} - exposure delay in milliseconds
-     */
-    get exposureDelayMs(): number {
-        return this._exposureDelayMs;
-    }
-
-    /**
-     * Set the exposure delay in milliseconds, which is the minimum
-     * time after which newly cached gaps will be exposed by
-     * lookupGap(). Setting this attribute automatically updates the
-     * internal state to honor the new value.
-     *
-     * @param {number} - exposure delay in milliseconds
-     */
-    set exposureDelayMs(exposureDelayMs: number) {
-        if (exposureDelayMs !== this._exposureDelayMs) {
-            this._exposureDelayMs = exposureDelayMs;
-            if (this._exposeFrozenInterval) {
-                // invalidate all pending gap updates, as the new interval may not be
-                // safe for them
-                this._stagingUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-                this._frozenUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-
-                // reinitialize the _exposeFrozenInterval timer with the updated delay
-                this.stop();
-                this.start();
-            }
-        }
-    }
-
-    /**
-     * Get the number of exposed gaps
-     *
-     * @return {number} number of exposed gaps
-     */
-    get size(): number {
-        return this._exposedGaps.size;
-    }
-
-    /**
-     * Iterate over exposed gaps
-     *
-     * @return {Iterator<GapSetEntry>} an iterator over exposed gaps
-     */
-    [Symbol.iterator](): Iterator<GapSetEntry> {
-        return this._exposedGaps[Symbol.iterator]();
-    }
-
-    /**
-     * Get an array of all exposed gaps
-     *
-     * @return {GapSetEntry[]} array of exposed gaps
-     */
-    toArray(): GapSetEntry[] {
-        return this._exposedGaps.toArray();
-    }
-
-    /**
-     * Clear all exposed and staging gaps from the cache.
-     *
-     * Note: retains invalidating updates from removeOverlappingGaps()
-     * for correctness of gaps inserted afterwards.
-     *
-     * @return {undefined}
-     */
-    clear(): void {
-        this._stagingUpdates.newGaps = new GapSet(this.maxGapWeight);
-        this._frozenUpdates.newGaps = new GapSet(this.maxGapWeight);
-        this._exposedGaps = new GapSet(this.maxGapWeight);
-    }
-}
--- a/lib/algos/cache/GapSet.ts
+++ b/lib/algos/cache/GapSet.ts
@ -1,366 +0,0 @@
-import assert from 'assert';
-import { OrderedSet } from '@js-sdsl/ordered-set';
-
-import errors from '../../errors';
-
-export type GapSetEntry = {
-    firstKey: string,
-    lastKey: string,
-    weight: number,
-};
-
-export interface GapSetInterface {
-    maxWeight: number;
-    size: number;
-
-    setGap: (firstKey: string, lastKey: string, weight: number) => GapSetEntry;
-    removeOverlappingGaps: (overlappingKeys: string[]) => number;
-    lookupGap: (minKey: string, maxKey?: string) => Promise<GapSetEntry | null>;
-    [Symbol.iterator]: () => Iterator<GapSetEntry>;
-    toArray: () => GapSetEntry[];
-};
-
-/**
- * Specialized data structure to support caching of listing "gaps",
- * i.e. ranges of keys that can be skipped over during listing
- * (because they only contain delete markers as latest versions)
- */
-export default class GapSet implements GapSetInterface, Iterable<GapSetEntry> {
-    _gaps: OrderedSet<GapSetEntry>;
-    _maxWeight: number;
-
-    /**
-     * @constructor
-
-     * @param {number} maxWeight - weight threshold for each cached
-     * gap (unitless). Triggers splitting gaps when reached
-     */
-    constructor(maxWeight: number) {
-        this._gaps = new OrderedSet(
-            [],
-            (left: GapSetEntry, right: GapSetEntry) => (
-                left.firstKey < right.firstKey ? -1 :
-                left.firstKey > right.firstKey ? 1 : 0
-            )
-        );
-        this._maxWeight = maxWeight;
-    }
-
-    /**
-     * Create a GapSet from an array of gap entries (used in tests)
-     */
-    static createFromArray(gaps: GapSetEntry[], maxWeight: number): GapSet {
-        const gapSet = new GapSet(maxWeight);
-        for (const gap of gaps) {
-            gapSet._gaps.insert(gap);
-        }
-        return gapSet;
-    }
-
-    /**
-     * Record a gap between two keys, associated with a weight to limit
-     * individual gap sizes in the cache.
-     *
-     * The function handles splitting and merging existing gaps to
-     * maintain an optimal weight of cache entries.
-     *
-     * @param {string} firstKey - first key of the gap
-     * @param {string} lastKey - last key of the gap, must be greater
-     * or equal than 'firstKey'
-     * @param {number} weight - total weight between 'firstKey' and 'lastKey'
-     * @return {GapSetEntry} - existing or new gap entry
-     */
-    setGap(firstKey: string, lastKey: string, weight: number): GapSetEntry {
-        assert(lastKey >= firstKey);
-
-        // Step 1/4: Find the closest left-overlapping gap, and either re-use it
-        // or chain it with a new gap depending on the weights if it exists (otherwise
-        // just creates a new gap).
-        const curGapIt = this._gaps.reverseLowerBound(<GapSetEntry>{ firstKey });
-        let curGap;
-        if (curGapIt.isAccessible()) {
-            curGap = curGapIt.pointer;
-            if (curGap.lastKey >= lastKey) {
-                // return fully overlapping gap already cached
-                return curGap;
-            }
-        }
-        let remainingWeight = weight;
-        if (!curGap                         // no previous gap
-            || curGap.lastKey < firstKey    // previous gap not overlapping
-            || (curGap.lastKey === firstKey // previous gap overlapping by one key...
-                && curGap.weight + weight > this._maxWeight) // ...but we can't extend it
-           ) {
-            // create a new gap indexed by 'firstKey'
-            curGap = { firstKey, lastKey: firstKey, weight: 0 };
-            this._gaps.insert(curGap);
-        } else if (curGap.lastKey > firstKey && weight > this._maxWeight) {
-            // previous gap is either fully or partially contained in the new gap
-            // and cannot be extended: substract its weight from the total (heuristic
-            // in case the previous gap doesn't start at 'firstKey', which is the
-            // uncommon case)
-            remainingWeight -= curGap.weight;
-
-            // there may be an existing chained gap starting with the previous gap's
-            // 'lastKey': use it if it exists
-            const chainedGapIt = this._gaps.find(<GapSetEntry>{ firstKey: curGap.lastKey });
-            if (chainedGapIt.isAccessible()) {
-                curGap = chainedGapIt.pointer;
-            } else {
-                // no existing chained gap: chain a new gap to the previous gap
-                curGap = {
-                    firstKey: curGap.lastKey,
-                    lastKey: curGap.lastKey,
-                    weight: 0,
-                };
-                this._gaps.insert(curGap);
-            }
-        }
-        // Step 2/4: Cleanup existing gaps fully included in firstKey -> lastKey, and
-        // aggregate their weights in curGap to define the minimum weight up to the
-        // last merged gap.
-        let nextGap;
-        while (true) {
-            const nextGapIt = this._gaps.upperBound(<GapSetEntry>{ firstKey: curGap.firstKey });
-            nextGap = nextGapIt.isAccessible() && nextGapIt.pointer;
-            // stop the cleanup when no more gap or if the next gap is not fully
-            // included in curGap
-            if (!nextGap || nextGap.lastKey > lastKey) {
-                break;
-            }
-            this._gaps.eraseElementByIterator(nextGapIt);
-            curGap.lastKey = nextGap.lastKey;
-            curGap.weight += nextGap.weight;
-        }
-
-        // Step 3/4: Extend curGap to lastKey, adjusting the weight.
-        // At this point, curGap weight is the minimum weight of the finished gap, save it
-        // for step 4.
-        let minMergedWeight = curGap.weight;
-        if (curGap.lastKey === firstKey && firstKey !== lastKey) {
-            // extend the existing gap by the full amount 'firstKey -> lastKey'
-            curGap.lastKey = lastKey;
-            curGap.weight += remainingWeight;
-        } else if (curGap.lastKey <= lastKey) {
-            curGap.lastKey = lastKey;
-            curGap.weight = remainingWeight;
-        }
-
-        // Step 4/4: Find the closest right-overlapping gap, and if it exists, either merge
-        // it or chain it with curGap depending on the weights.
-        if (nextGap && nextGap.firstKey <= lastKey) {
-            // nextGap overlaps with the new gap: check if we can merge it
-            minMergedWeight += nextGap.weight;
-            let mergedWeight;
-            if (lastKey === nextGap.firstKey) {
-                // nextGap is chained with curGap: add the full weight of nextGap
-                mergedWeight = curGap.weight + nextGap.weight;
-            } else {
-                // strict overlap: don't add nextGap's weight unless
-                // it's larger than the sum of merged ranges (as it is
-                // then included in `minMergedWeight`)
-                mergedWeight = Math.max(curGap.weight, minMergedWeight);
-            }
-            if (mergedWeight <= this._maxWeight) {
-                // merge nextGap into curGap
-                curGap.lastKey = nextGap.lastKey;
-                curGap.weight = mergedWeight;
-                this._gaps.eraseElementByKey(nextGap);
-            } else {
-                // adjust the last key to chain with nextGap and substract the next
-                // gap's weight from curGap (heuristic)
-                curGap.lastKey = nextGap.firstKey;
-                curGap.weight = Math.max(mergedWeight - nextGap.weight, 0);
-                curGap = nextGap;
-            }
-        }
-        // return a copy of curGap
-        return Object.assign({}, curGap);
-    }
-
-    /**
-     * Remove gaps that overlap with one or more keys in a given array or
-     * OrderedSet. Used to invalidate gaps when keys are inserted or deleted.
-     *
-     * @param {OrderedSet<string> | string[]} overlappingKeys - remove gaps that overlap
-     * with any of this set of keys
-     * @return {number} - how many gaps were removed
-     */
-    removeOverlappingGaps(overlappingKeys: OrderedSet<string> | string[]): number {
-        // To optimize processing with a large number of keys and/or gaps, this function:
-        //
-        // 1. converts the overlappingKeys array to a OrderedSet (if not already a OrderedSet)
-        // 2. queries both the gaps set and the overlapping keys set in a loop, which allows:
-        //    - skipping ranges of overlapping keys at once when there is no new overlapping gap
-        //    - skipping ranges of gaps at once when there is no overlapping key
-        //
-        // This way, it is efficient when the number of non-overlapping gaps is large
-        // (which is the most common case in practice).
-
-        let overlappingKeysSet;
-        if (Array.isArray(overlappingKeys)) {
-            overlappingKeysSet = new OrderedSet(overlappingKeys);
-        } else {
-            overlappingKeysSet = overlappingKeys;
-        }
-        const firstKeyIt = overlappingKeysSet.begin();
-        let currentKey = firstKeyIt.isAccessible() && firstKeyIt.pointer;
-        let nRemoved = 0;
-        while (currentKey) {
-            const closestGapIt = this._gaps.reverseUpperBound(<GapSetEntry>{ firstKey: currentKey });
-            if (closestGapIt.isAccessible()) {
-                const closestGap = closestGapIt.pointer;
-                if (currentKey <= closestGap.lastKey) {
-                    // currentKey overlaps closestGap: remove the gap
-                    this._gaps.eraseElementByIterator(closestGapIt);
-                    nRemoved += 1;
-                }
-            }
-            const nextGapIt = this._gaps.lowerBound(<GapSetEntry>{ firstKey: currentKey });
-            if (!nextGapIt.isAccessible()) {
-                // no more gap: we're done
-                return nRemoved;
-            }
-            const nextGap = nextGapIt.pointer;
-            // advance to the last key potentially overlapping with nextGap
-            let currentKeyIt = overlappingKeysSet.reverseLowerBound(nextGap.lastKey);
-            if (currentKeyIt.isAccessible()) {
-                currentKey = currentKeyIt.pointer;
-                if (currentKey >= nextGap.firstKey) {
-                    // currentKey overlaps nextGap: remove the gap
-                    this._gaps.eraseElementByIterator(nextGapIt);
-                    nRemoved += 1;
-                }
-            }
-            // advance to the first key potentially overlapping with another gap
-            currentKeyIt = overlappingKeysSet.lowerBound(nextGap.lastKey);
-            currentKey = currentKeyIt.isAccessible() && currentKeyIt.pointer;
-        }
-        return nRemoved;
-    }
-
-    /**
-     * Internal helper to coalesce multiple chained gaps into a single gap.
-     *
-     * It is only used to construct lookupGap() return values and
-     * doesn't modify the GapSet.
-     *
-     * NOTE: The function may take a noticeable amount of time and CPU
-     * to execute if a large number of chained gaps have to be
-     * coalesced, but it should never take more than a few seconds. In
-     * most cases it should take less than a millisecond. It regularly
-     * yields to the nodejs event loop to avoid blocking it during a
-     * long execution.
-     *
-     * @param {GapSetEntry} firstGap - first gap of the chain to coalesce with
-     * the next ones in the chain
-     * @return {Promise<GapSetEntry>} - a new coalesced entry, as a Promise
-     */
-    _coalesceGapChain(firstGap: GapSetEntry): Promise<GapSetEntry> {
-        return new Promise(resolve => {
-            const coalescedGap: GapSetEntry = Object.assign({}, firstGap);
-            const coalesceGapChainIteration = () => {
-                // efficiency trade-off: 100 iterations of log(N) complexity lookups should
-                // not block the event loop for too long
-                for (let opCounter = 0; opCounter < 100; ++opCounter) {
-                    const chainedGapIt = this._gaps.find(
-                            <GapSetEntry>{ firstKey: coalescedGap.lastKey });
-                    if (!chainedGapIt.isAccessible()) {
-                        // chain is complete
-                        return resolve(coalescedGap);
-                    }
-                    const chainedGap = chainedGapIt.pointer;
-                    if (chainedGap.firstKey === chainedGap.lastKey) {
-                        // found a single-key gap: chain is complete
-                        return resolve(coalescedGap);
-                    }
-                    coalescedGap.lastKey = chainedGap.lastKey;
-                    coalescedGap.weight += chainedGap.weight;
-                }
-                // yield to the event loop before continuing the process
-                // of coalescing the gap chain
-                return process.nextTick(coalesceGapChainIteration);
-            };
-            coalesceGapChainIteration();
-        });
-    }
-
-    /**
-     * Lookup the next gap that overlaps with [minKey, maxKey]. Internally chained
-     * gaps are coalesced in the response into a single contiguous large gap.
-     *
-     * @param {string} minKey - minimum key overlapping with the returned gap
-     * @param {string} [maxKey] - maximum key overlapping with the returned gap
-     * @return {Promise<GapSetEntry | null>} - result of the lookup if a gap
-     *   was found, null otherwise, as a Promise
-     */
-    async lookupGap(minKey: string, maxKey?: string): Promise<GapSetEntry | null> {
-        let firstGap: GapSetEntry | null = null;
-        const minGapIt = this._gaps.reverseLowerBound(<GapSetEntry>{ firstKey: minKey });
-        const minGap = minGapIt.isAccessible() && minGapIt.pointer;
-        if (minGap && minGap.lastKey >= minKey) {
-            firstGap = minGap;
-        } else {
-            const maxGapIt = this._gaps.upperBound(<GapSetEntry>{ firstKey: minKey });
-            const maxGap = maxGapIt.isAccessible() && maxGapIt.pointer;
-            if (maxGap && (maxKey === undefined || maxGap.firstKey <= maxKey)) {
-                firstGap = maxGap;
-            }
-        }
-        if (!firstGap) {
-            return null;
-        }
-        return this._coalesceGapChain(firstGap);
-    }
-
-    /**
-     * Get the maximum weight setting for individual gaps.
-     *
-     * @return {number} - maximum weight of individual gaps
-     */
-    get maxWeight(): number {
-        return this._maxWeight;
-    }
-
-    /**
-     * Set the maximum weight setting for individual gaps.
-     *
-     * @param {number} gapWeight - maximum weight of individual gaps
-     */
-    set maxWeight(gapWeight: number) {
-        this._maxWeight = gapWeight;
-    }
-
-    /**
-     * Get the number of gaps stored in this set.
-     *
-     * @return {number} - number of gaps stored in this set
-     */
-    get size(): number {
-        return this._gaps.size();
-    }
-
-    /**
-     * Iterate over each gap of the set, ordered by first key
-     *
-     * @return {Iterator<GapSetEntry>} - an iterator over all gaps
-     *   Example:
-     *     for (const gap of myGapSet) { ... }
-     */
-    [Symbol.iterator](): Iterator<GapSetEntry> {
-        return this._gaps[Symbol.iterator]();
-    }
-
-    /**
-     * Return an array containing all gaps, ordered by first key
-     *
-     * NOTE: there is a toArray() method in the OrderedSet implementation
-     * but it does not scale well and overflows the stack quickly. This is
-     * why we provide an implementation based on an iterator.
-     *
-     * @return {GapSetEntry[]} - an array containing all gaps
-     */
-    toArray(): GapSetEntry[] {
-        return [...this];
-    }
-}
--- a/lib/algos/list/Extension.js
+++ b/lib/algos/list/Extension.js
@ -1,6 +1,6 @@
 'use strict'; // eslint-disable-line strict

-const { FILTER_ACCEPT, SKIP_NONE } = require('./tools');
+const { FILTER_SKIP, SKIP_NONE } = require('./tools');

 // Use a heuristic to amortize the cost of JSON
 // serialization/deserialization only on largest metadata where the
@ -92,26 +92,21 @@ class Extension {
     * @param {object} entry - a listing entry from metadata
     *                         expected format: { key, value }
     * @return {number} - result of filtering the entry:
-     *                    FILTER_ACCEPT: entry is accepted and may or not be included
-     *                                   in the result
-     *                    FILTER_SKIP: listing may skip directly (with "gte" param) to
-     *                                 the key returned by the skipping() method
-     *                    FILTER_END: the results are complete, listing can be stopped
+     *                    > 0: entry is accepted and included in the result
+     *                    = 0: entry is accepted but not included (skipping)
+     *                    < 0: entry is not accepted, listing should finish
     */
-    filter(/* entry: { key, value } */) {
-        return FILTER_ACCEPT;
+    filter(entry) {
+        return entry ? FILTER_SKIP : FILTER_SKIP;
    }

    /**
-     * Provides the next key at which the listing task is allowed to skip to.
-     * This could allow to skip over:
-     * - a key prefix ending with the delimiter
-     * - all remaining versions of an object when doing a current
-     *   versions listing in v0 format
-     * - a cached "gap" of deleted objects when doing a current
-     *   versions listing in v0 format
+     * Provides the insight into why filter is skipping an entry. This could be
+     * because it is skipping a range of delimited keys or a range of specific
+     * version when doing master version listing.
     *
-     * @return {string} - the next key at which the listing task is allowed to skip to
+     * @return {string} - the insight: a common prefix or a master key,
+     *                                 or SKIP_NONE if there is no insight
     */
    skipping() {
        return SKIP_NONE;
--- a/lib/algos/list/MPU.js
+++ b/lib/algos/list/MPU.js
@ -1,7 +1,7 @@
 'use strict'; // eslint-disable-line strict

 const { inc, checkLimit, listingParamsMasterKeysV0ToV1,
-    FILTER_END, FILTER_ACCEPT, SKIP_NONE } = require('./tools');
+    FILTER_END, FILTER_ACCEPT } = require('./tools');
 const DEFAULT_MAX_KEYS = 1000;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
@ -163,7 +163,7 @@ class MultipartUploads {
    }

    skipping() {
-        return SKIP_NONE;
+        return '';
    }

    /**
--- a/lib/algos/list/basic.js
+++ b/lib/algos/list/basic.js
@ -2,7 +2,7 @@

 const Extension = require('./Extension').default;

-const { checkLimit, FILTER_END, FILTER_ACCEPT } = require('./tools');
+const { checkLimit, FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
 const DEFAULT_MAX_KEYS = 10000;

 /**
@ -91,7 +91,7 @@ class List extends Extension {
     *                     < 0 : listing done
     */
    filter(elem) {
-        // Check if the result array is full
+        // Check first in case of maxkeys <= 0
        if (this.keys >= this.maxKeys) {
            return FILTER_END;
        }
@ -99,7 +99,7 @@ class List extends Extension {
             this.filterKeyStartsWith !== undefined) &&
            typeof elem === 'object' &&
            !this.customFilter(elem.value)) {
-            return FILTER_ACCEPT;
+            return FILTER_SKIP;
        }
        if (typeof elem === 'object') {
            this.res.push({
--- a/lib/algos/list/delimiter.js
+++ b/lib/algos/list/delimiter.js
@ -0,0 +1,274 @@
+'use strict'; // eslint-disable-line strict
+
+const Extension = require('./Extension').default;
+const { inc, listingParamsMasterKeysV0ToV1,
+    FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
+
+/**
+ * Find the common prefix in the path
+ *
+ * @param {String} key            - path of the object
+ * @param {String} delimiter      - separator
+ * @param {Number} delimiterIndex - 'folder' index in the path
+ * @return {String}               - CommonPrefix
+ */
+function getCommonPrefix(key, delimiter, delimiterIndex) {
+    return key.substring(0, delimiterIndex + delimiter.length);
+}
+
+/**
+ * Handle object listing with parameters
+ *
+ * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
+ * @prop {String[]} Contents           - 'files' to list
+ * @prop {Boolean} IsTruncated         - truncated listing flag
+ * @prop {String|undefined} NextMarker - marker per amazon format
+ * @prop {Number} keys                 - count of listed keys
+ * @prop {String|undefined} delimiter  - separator per amazon format
+ * @prop {String|undefined} prefix     - prefix per amazon format
+ * @prop {Number} maxKeys              - number of keys to list
+ */
+class Delimiter extends Extension {
+    /**
+     * Create a new Delimiter instance
+     * @constructor
+     * @param {Object}  parameters                     - listing parameters
+     * @param {String}  [parameters.delimiter]         - delimiter per amazon
+     *                                                   format
+     * @param {String}  [parameters.prefix]            - prefix per amazon
+     *                                                   format
+     * @param {String}  [parameters.marker]            - marker per amazon
+     *                                                   format
+     * @param {Number}  [parameters.maxKeys]           - number of keys to list
+     * @param {Boolean} [parameters.v2]                - indicates whether v2
+     *                                                   format
+     * @param {String}  [parameters.startAfter]        - marker per amazon
+     *                                                   format
+     * @param {String}  [parameters.continuationToken] - obfuscated amazon
+     *                                                   token
+     * @param {Boolean} [parameters.alphabeticalOrder] - Either the result is
+     *                                                   alphabetically ordered
+     *                                                   or not
+     * @param {RequestLogger} logger                   - The logger of the
+     *                                                   request
+     * @param {String} [vFormat]                       - versioning key format
+     */
+    constructor(parameters, logger, vFormat) {
+        super(parameters, logger);
+        // original listing parameters
+        this.delimiter = parameters.delimiter;
+        this.prefix = parameters.prefix;
+        this.marker = parameters.marker;
+        this.maxKeys = parameters.maxKeys || 1000;
+        this.startAfter = parameters.startAfter;
+        this.continuationToken = parameters.continuationToken;
+        this.alphabeticalOrder =
+          typeof parameters.alphabeticalOrder !== 'undefined' ?
+              parameters.alphabeticalOrder : true;
+
+        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
+        // results
+        this.CommonPrefixes = [];
+        this.Contents = [];
+        this.IsTruncated = false;
+        this.NextMarker = parameters.marker;
+        this.NextContinuationToken =
+            parameters.continuationToken || parameters.startAfter;
+
+        this.startMarker = parameters.v2 ? 'startAfter' : 'marker';
+        this.continueMarker = parameters.v2 ? 'continuationToken' : 'marker';
+        this.nextContinueMarker = parameters.v2 ?
+            'NextContinuationToken' : 'NextMarker';
+
+        if (this.delimiter !== undefined &&
+            this[this.nextContinueMarker] !== undefined &&
+            this[this.nextContinueMarker].startsWith(this.prefix || '')) {
+            const nextDelimiterIndex =
+                this[this.nextContinueMarker].indexOf(this.delimiter,
+                    this.prefix ? this.prefix.length : 0);
+            this[this.nextContinueMarker] =
+                this[this.nextContinueMarker].slice(0, nextDelimiterIndex +
+                                        this.delimiter.length);
+        }
+
+        Object.assign(this, {
+            [BucketVersioningKeyFormat.v0]: {
+                genMDParams: this.genMDParamsV0,
+                getObjectKey: this.getObjectKeyV0,
+                skipping: this.skippingV0,
+            },
+            [BucketVersioningKeyFormat.v1]: {
+                genMDParams: this.genMDParamsV1,
+                getObjectKey: this.getObjectKeyV1,
+                skipping: this.skippingV1,
+            },
+        }[this.vFormat]);
+    }
+
+    genMDParamsV0() {
+        const params = {};
+        if (this.prefix) {
+            params.gte = this.prefix;
+            params.lt = inc(this.prefix);
+        }
+        const startVal = this[this.continueMarker] || this[this.startMarker];
+        if (startVal) {
+            if (params.gte && params.gte > startVal) {
+                return params;
+            }
+            delete params.gte;
+            params.gt = startVal;
+        }
+        return params;
+    }
+
+    genMDParamsV1() {
+        const params = this.genMDParamsV0();
+        return listingParamsMasterKeysV0ToV1(params);
+    }
+
+    /**
+     * check if the max keys count has been reached and set the
+     * final state of the result if it is the case
+     * @return {Boolean} - indicates if the iteration has to stop
+     */
+    _reachedMaxKeys() {
+        if (this.keys >= this.maxKeys) {
+            // In cases of maxKeys <= 0 -> IsTruncated = false
+            this.IsTruncated = this.maxKeys > 0;
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     *  Add a (key, value) tuple to the listing
+     *  Set the NextMarker to the current key
+     *  Increment the keys counter
+     *  @param {String} key   - The key to add
+     *  @param {String} value - The value of the key
+     *  @return {number}      - indicates if iteration should continue
+     */
+    addContents(key, value) {
+        if (this._reachedMaxKeys()) {
+            return FILTER_END;
+        }
+        this.Contents.push({ key, value: this.trimMetadata(value) });
+        this[this.nextContinueMarker] = key;
+        ++this.keys;
+        return FILTER_ACCEPT;
+    }
+
+    getObjectKeyV0(obj) {
+        return obj.key;
+    }
+
+    getObjectKeyV1(obj) {
+        return obj.key.slice(DbPrefixes.Master.length);
+    }
+
+    /**
+     *  Filter to apply on each iteration, based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filter(obj) {
+        const key = this.getObjectKey(obj);
+        const value = obj.value;
+        if ((this.prefix && !key.startsWith(this.prefix))
+            || (this.alphabeticalOrder
+                && typeof this[this.nextContinueMarker] === 'string'
+                && key <= this[this.nextContinueMarker])) {
+            return FILTER_SKIP;
+        }
+        if (this.delimiter) {
+            const baseIndex = this.prefix ? this.prefix.length : 0;
+            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
+            if (delimiterIndex === -1) {
+                return this.addContents(key, value);
+            }
+            return this.addCommonPrefix(key, delimiterIndex);
+        }
+        return this.addContents(key, value);
+    }
+
+    /**
+     * Add a Common Prefix in the list
+     * @param {String} key   - object name
+     * @param {Number} index - after prefix starting point
+     * @return {Boolean}     - indicates if iteration should continue
+     */
+    addCommonPrefix(key, index) {
+        const commonPrefix = getCommonPrefix(key, this.delimiter, index);
+        if (this.CommonPrefixes.indexOf(commonPrefix) === -1
+                && this[this.nextContinueMarker] !== commonPrefix) {
+            if (this._reachedMaxKeys()) {
+                return FILTER_END;
+            }
+            this.CommonPrefixes.push(commonPrefix);
+            this[this.nextContinueMarker] = commonPrefix;
+            ++this.keys;
+            return FILTER_ACCEPT;
+        }
+        return FILTER_SKIP;
+    }
+
+    /**
+     * If repd happens to want to skip listing on a bucket in v0
+     * versioning key format, here is an idea.
+     *
+     * @return {string} - the present range (NextMarker) if repd believes
+     *                    that it's enough and should move on
+     */
+    skippingV0() {
+        return this[this.nextContinueMarker];
+    }
+
+    /**
+     * If repd happens to want to skip listing on a bucket in v1
+     * versioning key format, here is an idea.
+     *
+     * @return {string} - the present range (NextMarker) if repd believes
+     *                    that it's enough and should move on
+     */
+    skippingV1() {
+        return DbPrefixes.Master + this[this.nextContinueMarker];
+    }
+
+    /**
+     *  Return an object containing all mandatory fields to use once the
+     *  iteration is done, doesn't show a NextMarker field if the output
+     *  isn't truncated
+     *  @return {Object} - following amazon format
+     */
+    result() {
+        /* NextMarker is only provided when delimiter is used.
+         * specified in v1 listing documentation
+         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
+         */
+        const result = {
+            CommonPrefixes: this.CommonPrefixes,
+            Contents: this.Contents,
+            IsTruncated: this.IsTruncated,
+            Delimiter: this.delimiter,
+        };
+        if (this.parameters.v2) {
+            result.NextContinuationToken = this.IsTruncated
+                ? this.NextContinuationToken : undefined;
+        } else {
+            result.NextMarker = (this.IsTruncated && this.delimiter)
+                ? this.NextMarker : undefined;
+        }
+        return result;
+    }
+}
+
+module.exports = { Delimiter };
--- a/lib/algos/list/delimiter.ts
+++ b/lib/algos/list/delimiter.ts
@ -1,356 +0,0 @@
-'use strict'; // eslint-disable-line strict
-
-const Extension = require('./Extension').default;
-const { inc, listingParamsMasterKeysV0ToV1,
-    FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
-const VSConst = require('../../versioning/constants').VersioningConstants;
-const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
-
-export interface FilterState {
-    id: number,
-};
-
-export interface FilterReturnValue {
-    FILTER_ACCEPT,
-    FILTER_SKIP,
-    FILTER_END,
-};
-
-export const enum DelimiterFilterStateId {
-    NotSkipping = 1,
-    SkippingPrefix = 2,
-};
-
-export interface DelimiterFilterState_NotSkipping extends FilterState {
-    id: DelimiterFilterStateId.NotSkipping,
-};
-
-export interface DelimiterFilterState_SkippingPrefix extends FilterState {
-    id: DelimiterFilterStateId.SkippingPrefix,
-    prefix: string;
-};
-
-type KeyHandler = (key: string, value: string) => FilterReturnValue;
-
-export type ResultObject = {
-    CommonPrefixes: string[];
-    Contents: {
-        key: string;
-        value: string;
-    }[];
-    IsTruncated: boolean;
-    Delimiter ?: string;
-    NextMarker ?: string;
-    NextContinuationToken ?: string;
-};
-
-/**
- * Handle object listing with parameters
- *
- * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
- * @prop {String[]} Contents           - 'files' to list
- * @prop {Boolean} IsTruncated         - truncated listing flag
- * @prop {String|undefined} NextMarker - marker per amazon format
- * @prop {Number} keys                 - count of listed keys
- * @prop {String|undefined} delimiter  - separator per amazon format
- * @prop {String|undefined} prefix     - prefix per amazon format
- * @prop {Number} maxKeys              - number of keys to list
- */
-export class Delimiter extends Extension {
-
-    state: FilterState;
-    keyHandlers: { [id: number]: KeyHandler };
-
-    /**
-     * Create a new Delimiter instance
-     * @constructor
-     * @param {Object}  parameters                     - listing parameters
-     * @param {String}  [parameters.delimiter]         - delimiter per amazon
-     *                                                   format
-     * @param {String}  [parameters.prefix]            - prefix per amazon
-     *                                                   format
-     * @param {String}  [parameters.marker]            - marker per amazon
-     *                                                   format
-     * @param {Number}  [parameters.maxKeys]           - number of keys to list
-     * @param {Boolean} [parameters.v2]                - indicates whether v2
-     *                                                   format
-     * @param {String}  [parameters.startAfter]        - marker per amazon
-     *                                                   format
-     * @param {String}  [parameters.continuationToken] - obfuscated amazon
-     *                                                   token
-     * @param {RequestLogger} logger                   - The logger of the
-     *                                                   request
-     * @param {String} [vFormat]                       - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger);
-        // original listing parameters
-        this.delimiter = parameters.delimiter;
-        this.prefix = parameters.prefix;
-        this.maxKeys = parameters.maxKeys || 1000;
-
-        if (parameters.v2) {
-            this.marker = parameters.continuationToken || parameters.startAfter;
-        } else {
-            this.marker = parameters.marker;
-        }
-        this.nextMarker = this.marker;
-
-        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
-        // results
-        this.CommonPrefixes = [];
-        this.Contents = [];
-        this.IsTruncated = false;
-        this.keyHandlers = {};
-
-        Object.assign(this, {
-            [BucketVersioningKeyFormat.v0]: {
-                genMDParams: this.genMDParamsV0,
-                getObjectKey: this.getObjectKeyV0,
-                skipping: this.skippingV0,
-            },
-            [BucketVersioningKeyFormat.v1]: {
-                genMDParams: this.genMDParamsV1,
-                getObjectKey: this.getObjectKeyV1,
-                skipping: this.skippingV1,
-            },
-        }[this.vFormat]);
-
-        // if there is a delimiter, we may skip ranges by prefix,
-        // hence using the NotSkippingPrefix flavor that checks the
-        // subprefix up to the delimiter for the NotSkipping state
-        if (this.delimiter) {
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefix.bind(this));
-        } else {
-            // listing without a delimiter never has to skip over any
-            // prefix -> use NeverSkipping flavor for the NotSkipping
-            // state
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NeverSkipping.bind(this));
-        }
-        this.setKeyHandler(
-            DelimiterFilterStateId.SkippingPrefix,
-            this.keyHandler_SkippingPrefix.bind(this));
-
-        this.state = <DelimiterFilterState_NotSkipping> {
-            id: DelimiterFilterStateId.NotSkipping,
-        };
-    }
-
-    genMDParamsV0() {
-        const params: { gt ?: string, gte ?: string, lt ?: string } = {};
-        if (this.prefix) {
-            params.gte = this.prefix;
-            params.lt = inc(this.prefix);
-        }
-        if (this.marker && this.delimiter) {
-            const commonPrefix = this.getCommonPrefix(this.marker);
-            if (commonPrefix) {
-                const afterPrefix = inc(commonPrefix);
-                if (!params.gte || afterPrefix > params.gte) {
-                    params.gte = afterPrefix;
-                }
-            }
-        }
-        if (this.marker && (!params.gte || this.marker >= params.gte)) {
-            delete params.gte;
-            params.gt = this.marker;
-        }
-        return params;
-    }
-
-    genMDParamsV1() {
-        const params = this.genMDParamsV0();
-        return listingParamsMasterKeysV0ToV1(params);
-    }
-
-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.keys >= this.maxKeys) {
-            // In cases of maxKeys <= 0 -> IsTruncated = false
-            this.IsTruncated = this.maxKeys > 0;
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     *  Add a (key, value) tuple to the listing
-     *  Set the NextMarker to the current key
-     *  Increment the keys counter
-     *  @param {String} key   - The key to add
-     *  @param {String} value - The value of the key
-     *  @return {number}      - indicates if iteration should continue
-     */
-    addContents(key: string, value: string): void {
-        this.Contents.push({ key, value: this.trimMetadata(value) });
-        ++this.keys;
-        this.nextMarker = key;
-    }
-
-    getCommonPrefix(key: string): string | undefined {
-        if (!this.delimiter) {
-            return undefined;
-        }
-        const baseIndex = this.prefix ? this.prefix.length : 0;
-        const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
-        if (delimiterIndex === -1) {
-            return undefined;
-        }
-        return key.substring(0, delimiterIndex + this.delimiter.length);
-    }
-
-    /**
-     * Add a Common Prefix in the list
-     * @param {String} commonPrefix   - common prefix to add
-     * @param {String} key            - full key starting with commonPrefix
-     * @return {Boolean}     - indicates if iteration should continue
-     */
-    addCommonPrefix(commonPrefix: string, key: string): void {
-        // add the new prefix to the list
-        this.CommonPrefixes.push(commonPrefix);
-        ++this.keys;
-        this.nextMarker = commonPrefix;
-    }
-
-    addCommonPrefixOrContents(key: string, value: string): string | undefined {
-        // add the subprefix to the common prefixes if the key has the delimiter
-        const commonPrefix = this.getCommonPrefix(key);
-        if (commonPrefix) {
-            this.addCommonPrefix(commonPrefix, key);
-            return commonPrefix;
-        }
-        this.addContents(key, value);
-        return undefined;
-    }
-
-    getObjectKeyV0(obj: { key: string }): string {
-        return obj.key;
-    }
-
-    getObjectKeyV1(obj: { key: string }): string {
-        return obj.key.slice(DbPrefixes.Master.length);
-    }
-
-    /**
-     *  Filter to apply on each iteration, based on:
-     *  - prefix
-     *  - delimiter
-     *  - maxKeys
-     *  The marker is being handled directly by levelDB
-     *  @param {Object} obj       - The key and value of the element
-     *  @param {String} obj.key   - The key of the element
-     *  @param {String} obj.value - The value of the element
-     *  @return {number}          - indicates if iteration should continue
-     */
-    filter(obj: { key: string, value: string }): FilterReturnValue {
-        const key = this.getObjectKey(obj);
-        const value = obj.value;
-
-        return this.handleKey(key, value);
-    }
-
-    setState(state: FilterState): void {
-        this.state = state;
-    }
-
-    setKeyHandler(stateId: number, keyHandler: KeyHandler): void {
-        this.keyHandlers[stateId] = keyHandler;
-    }
-
-    handleKey(key: string, value: string): FilterReturnValue {
-        return this.keyHandlers[this.state.id](key, value);
-    }
-
-    keyHandler_NeverSkipping(key: string, value: string): FilterReturnValue {
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-        this.addContents(key, value);
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_NotSkippingPrefix(key: string, value: string): FilterReturnValue {
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-        const commonPrefix = this.addCommonPrefixOrContents(key, value);
-        if (commonPrefix) {
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-        }
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_SkippingPrefix(key: string, value: string): FilterReturnValue {
-        const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
-        if (key.startsWith(prefix)) {
-            return FILTER_SKIP;
-        }
-        this.setState(<DelimiterFilterState_NotSkipping> {
-            id: DelimiterFilterStateId.NotSkipping,
-        });
-        return this.handleKey(key, value);
-    }
-
-    skippingBase(): string | undefined {
-        switch (this.state.id) {
-        case DelimiterFilterStateId.SkippingPrefix:
-            const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
-            return inc(prefix);
-
-        default:
-            return SKIP_NONE;
-        }
-    }
-
-    skippingV0() {
-        return this.skippingBase();
-    }
-
-    skippingV1() {
-        const skipTo = this.skippingBase();
-        if (skipTo === SKIP_NONE) {
-            return SKIP_NONE;
-        }
-        return DbPrefixes.Master + skipTo;
-    }
-
-    /**
-     *  Return an object containing all mandatory fields to use once the
-     *  iteration is done, doesn't show a NextMarker field if the output
-     *  isn't truncated
-     *  @return {Object} - following amazon format
-     */
-    result(): ResultObject {
-        /* NextMarker is only provided when delimiter is used.
-         * specified in v1 listing documentation
-         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
-         */
-        const result: ResultObject = {
-            CommonPrefixes: this.CommonPrefixes,
-            Contents: this.Contents,
-            IsTruncated: this.IsTruncated,
-            Delimiter: this.delimiter,
-        };
-        if (this.parameters.v2) {
-            result.NextContinuationToken = this.IsTruncated
-                ? this.nextMarker : undefined;
-        } else {
-            result.NextMarker = (this.IsTruncated && this.delimiter)
-                ? this.nextMarker : undefined;
-        }
-        return result;
-    }
-}
--- a/lib/algos/list/delimiterCurrent.ts
+++ b/lib/algos/list/delimiterCurrent.ts
@ -1,127 +0,0 @@
-const { DelimiterMaster } = require('./delimiterMaster');
-const { FILTER_ACCEPT, FILTER_END } = require('./tools');
-
-type ResultObject = {
-    Contents: {
-        key: string;
-        value: string;
-    }[];
-    IsTruncated: boolean;
-    NextMarker ?: string;
-};
-
-/**
- * Handle object listing with parameters. This extends the base class DelimiterMaster
- * to return the master/current versions.
- */
-class DelimiterCurrent extends DelimiterMaster {
-    /**
-     * Delimiter listing of current versions.
-     * @param {Object}  parameters            - listing parameters
-     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
-     * @param {String}  parameters.excludedDataStoreName - excluded datatore name
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
-     * @param {RequestLogger} logger          - The logger of the request
-     * @param {String} [vFormat]              - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger, vFormat);
-
-        this.beforeDate = parameters.beforeDate;
-        this.excludedDataStoreName = parameters.excludedDataStoreName;
-        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
-        this.scannedKeys = 0;
-    }
-
-    genMDParamsV0() {
-        const params = super.genMDParamsV0();
-        // lastModified and dataStoreName parameters are used by metadata that enables built-in filtering, 
-        // a feature currently exclusive to MongoDB
-        if (this.beforeDate) {
-            params.lastModified = {
-                lt: this.beforeDate,
-            };
-        }
-
-        if (this.excludedDataStoreName) {
-            params.dataStoreName = {
-                ne: this.excludedDataStoreName,
-            }
-        }
-
-        return params;
-    }
-
-    /**
-     * Parses the stringified entry's value.
-     * @param s - sringified value
-     * @return - undefined if parsing fails, otherwise it contains the parsed value.
-     */
-    _parse(s) {
-        let p;
-        try {
-            p = JSON.parse(s);
-        } catch (e: any) {
-            this.logger.warn(
-                'Could not parse Object Metadata while listing',
-                { err: e.toString() });
-        }
-        return p;
-    }
-
-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     *
-     * specialized implementation on DelimiterCurrent to also check
-     * the number of scanned keys
-     *
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return true;
-        }
-        return super._reachedMaxKeys();
-    }
-
-    addContents(key, value) {
-        ++this.scannedKeys;
-        const parsedValue = this._parse(value);
-        // if parsing fails, skip the key.
-        if (parsedValue) {
-            const lastModified = parsedValue['last-modified'];
-            const dataStoreName = parsedValue.dataStoreName;
-            // We then check if the current version is older than the "beforeDate" and
-            // "excludedDataStoreName" is not specified or if specified and the data store name is different.
-            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) &&
-                (!this.excludedDataStoreName || dataStoreName !== this.excludedDataStoreName)) {
-                super.addContents(key, value);
-            }
-            // In the event of a timeout occurring before any content is added,
-            // NextMarker is updated even if the object is not eligible.
-            // It minimizes the amount of data that the client needs to re-process if the request times out.
-            this.nextMarker = key;
-        }
-    }
-
-    result(): object {
-        const result: ResultObject = {
-            Contents: this.Contents,
-            IsTruncated: this.IsTruncated,
-        };
-
-        if (this.IsTruncated) {
-            result.NextMarker = this.nextMarker;
-        }
-
-        return result;
-    }
-}
-module.exports = { DelimiterCurrent };
--- a/lib/algos/list/delimiterMaster.js
+++ b/lib/algos/list/delimiterMaster.js
@ -0,0 +1,196 @@
+'use strict'; // eslint-disable-line strict
+
+const Delimiter = require('./delimiter').Delimiter;
+const Version = require('../../versioning/Version').Version;
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { BucketVersioningKeyFormat } = VSConst;
+const { FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
+
+const VID_SEP = VSConst.VersionId.Separator;
+const { DbPrefixes } = VSConst;
+
+/**
+ * Handle object listing with parameters. This extends the base class Delimiter
+ * to return the raw master versions of existing objects.
+ */
+class DelimiterMaster extends Delimiter {
+    /**
+     * Delimiter listing of master versions.
+     * @param {Object}  parameters            - listing parameters
+     * @param {String}  parameters.delimiter  - delimiter per amazon format
+     * @param {String}  parameters.prefix     - prefix per amazon format
+     * @param {String}  parameters.marker     - marker per amazon format
+     * @param {Number}  parameters.maxKeys    - number of keys to list
+     * @param {Boolean} parameters.v2         - indicates whether v2 format
+     * @param {String}  parameters.startAfter - marker per amazon v2 format
+     * @param {String}  parameters.continuationToken - obfuscated amazon token
+     * @param {RequestLogger} logger          - The logger of the request
+     * @param {String} [vFormat]              - versioning key format
+     */
+    constructor(parameters, logger, vFormat) {
+        super(parameters, logger, vFormat);
+        // non-PHD master version or a version whose master is a PHD version
+        this.prvKey = undefined;
+        this.prvPHDKey = undefined;
+        this.inReplayPrefix = false;
+
+        Object.assign(this, {
+            [BucketVersioningKeyFormat.v0]: {
+                filter: this.filterV0,
+                skipping: this.skippingV0,
+            },
+            [BucketVersioningKeyFormat.v1]: {
+                filter: this.filterV1,
+                skipping: this.skippingV1,
+            },
+        }[this.vFormat]);
+    }
+
+    /**
+     *  Filter to apply on each iteration for buckets in v0 format,
+     *  based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV0(obj) {
+        let key = obj.key;
+        const value = obj.value;
+
+        if (key.startsWith(DbPrefixes.Replay)) {
+            this.inReplayPrefix = true;
+            return FILTER_SKIP;
+        }
+        this.inReplayPrefix = false;
+
+        /* Skip keys not starting with the prefix or not alphabetically
+         * ordered. */
+        if ((this.prefix && !key.startsWith(this.prefix))
+                || (typeof this[this.nextContinueMarker] === 'string' &&
+                    key <= this[this.nextContinueMarker])) {
+            return FILTER_SKIP;
+        }
+
+        /* Skip version keys (<key><versionIdSeparator><version>) if we already
+         * have a master version. */
+        const versionIdIndex = key.indexOf(VID_SEP);
+        if (versionIdIndex >= 0) {
+            key = key.slice(0, versionIdIndex);
+            /* - key === this.prvKey is triggered when a master version has
+             *   been accepted for this key,
+             * - key === this.NextMarker or this.NextContinueToken is triggered
+             *   when a listing page ends on an accepted obj and the next page
+             *   starts with a version of this object.
+             *   In that case prvKey is default set to undefined
+             *   in the constructor and comparing to NextMarker is the only
+             *   way to know  we should not accept this version. This test is
+             *   not redundant with the one at the beginning of this function,
+             *   we are comparing here the key without the version suffix,
+             * - key startsWith the previous NextMarker happens because we set
+             *   NextMarker to the common prefix instead of the whole key
+             *   value. (TODO: remove this test once ZENKO-1048 is fixed)
+             *   */
+            if (key === this.prvKey || key === this[this.nextContinueMarker] ||
+                (this.delimiter &&
+                key.startsWith(this[this.nextContinueMarker]))) {
+                /* master version already filtered */
+                return FILTER_SKIP;
+            }
+        }
+        if (Version.isPHD(value)) {
+            /* master version is a PHD version, we want to wait for the next
+             * one:
+             * - Set the prvKey to undefined to not skip the next version,
+             * - return accept to avoid users to skip the next values in range
+             *   (skip scan mechanism in metadata backend like Metadata or
+             *   MongoClient). */
+            this.prvKey = undefined;
+            this.prvPHDKey = key;
+            return FILTER_ACCEPT;
+        }
+        if (Version.isDeleteMarker(value)) {
+            /* This entry is a deleteMarker which has not been filtered by the
+             * version test. Either :
+             * - it is a deleteMarker on the master version, we want to SKIP
+             *   all the following entries with this key (no master version),
+             * - or a deleteMarker following a PHD (setting prvKey to undefined
+             *   when an entry is a PHD avoids the skip on version for the
+             *   next entry). In that case we expect the master version to
+             *   follow. */
+            if (key === this.prvPHDKey) {
+                this.prvKey = undefined;
+                return FILTER_ACCEPT;
+            }
+            this.prvKey = key;
+            return FILTER_SKIP;
+        }
+
+        this.prvKey = key;
+        if (this.delimiter) {
+            // check if the key has the delimiter
+            const baseIndex = this.prefix ? this.prefix.length : 0;
+            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
+            if (delimiterIndex >= 0) {
+                // try to add the prefix to the list
+                return this.addCommonPrefix(key, delimiterIndex);
+            }
+        }
+        return this.addContents(key, value);
+    }
+
+    /**
+     *  Filter to apply on each iteration for buckets in v1 format,
+     *  based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV1(obj) {
+        // Filtering master keys in v1 is simply listing the master
+        // keys, as the state of version keys do not change the
+        // result, so we can use Delimiter method directly.
+        return super.filter(obj);
+    }
+
+    skippingBase() {
+        if (this[this.nextContinueMarker]) {
+            // next marker or next continuation token:
+            // - foo/ : skipping foo/
+            // - foo  : skipping foo.
+            const index = this[this.nextContinueMarker].
+                lastIndexOf(this.delimiter);
+            if (index === this[this.nextContinueMarker].length - 1) {
+                return this[this.nextContinueMarker];
+            }
+            return this[this.nextContinueMarker] + VID_SEP;
+        }
+        return SKIP_NONE;
+    }
+
+    skippingV0() {
+        if (this.inReplayPrefix) {
+            return DbPrefixes.Replay;
+        }
+        return this.skippingBase();
+    }
+
+    skippingV1() {
+        const skipTo = this.skippingBase();
+        if (skipTo === SKIP_NONE) {
+            return SKIP_NONE;
+        }
+        return DbPrefixes.Master + skipTo;
+    }
+}
+
+module.exports = { DelimiterMaster };
--- a/lib/algos/list/delimiterMaster.ts
+++ b/lib/algos/list/delimiterMaster.ts
@ -1,620 +0,0 @@
-import {
-    Delimiter,
-    FilterState,
-    FilterReturnValue,
-    DelimiterFilterStateId,
-    DelimiterFilterState_NotSkipping,
-    DelimiterFilterState_SkippingPrefix,
-    ResultObject,
-} from './delimiter';
-const Version = require('../../versioning/Version').Version;
-const VSConst = require('../../versioning/constants').VersioningConstants;
-const { BucketVersioningKeyFormat } = VSConst;
-const { FILTER_ACCEPT, FILTER_SKIP, FILTER_END, SKIP_NONE, inc } = require('./tools');
-
-import { GapSetEntry } from '../cache/GapSet';
-import { GapCacheInterface } from '../cache/GapCache';
-
-const VID_SEP = VSConst.VersionId.Separator;
-const { DbPrefixes } = VSConst;
-
-export const enum DelimiterMasterFilterStateId {
-    SkippingVersionsV0 = 101,
-    WaitVersionAfterPHDV0 = 102,
-    SkippingGapV0 = 103,
-};
-
-interface DelimiterMasterFilterState_SkippingVersionsV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-    masterKey: string,
-};
-
-interface DelimiterMasterFilterState_WaitVersionAfterPHDV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-    masterKey: string,
-};
-
-interface DelimiterMasterFilterState_SkippingGapV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.SkippingGapV0,
-};
-
-export const enum GapCachingState {
-    NoGapCache = 0, // there is no gap cache
-    UnknownGap = 1, // waiting for a cache lookup
-    GapLookupInProgress = 2, // asynchronous gap lookup in progress
-    GapCached = 3, // an upcoming or already skippable gap is cached
-    NoMoreGap = 4, // the cache doesn't have any more gaps inside the listed range
-};
-
-type GapCachingInfo_NoGapCache = {
-    state: GapCachingState.NoGapCache;
-};
-
-type GapCachingInfo_NoCachedGap = {
-    state: GapCachingState.UnknownGap
-        | GapCachingState.GapLookupInProgress
-    gapCache: GapCacheInterface;
-};
-
-type GapCachingInfo_GapCached = {
-    state: GapCachingState.GapCached;
-    gapCache: GapCacheInterface;
-    gapCached: GapSetEntry;
-};
-
-type GapCachingInfo_NoMoreGap = {
-    state: GapCachingState.NoMoreGap;
-};
-
-type GapCachingInfo = GapCachingInfo_NoGapCache
-    | GapCachingInfo_NoCachedGap
-    | GapCachingInfo_GapCached
-    | GapCachingInfo_NoMoreGap;
-
-
-export const enum GapBuildingState {
-    Disabled = 0, // no gap cache or no gap building needed (e.g. in V1 versioning format)
-    NotBuilding = 1, // not currently building a gap (i.e. not listing within a gap)
-    Building = 2, // currently building a gap (i.e. listing within a gap)
-    Expired = 3, // not allowed to build due to exposure delay timeout
-};
-
-type GapBuildingInfo_NothingToBuild = {
-    state: GapBuildingState.Disabled | GapBuildingState.Expired;
-};
-
-type GapBuildingParams = {
-    /**
-     * minimum weight for a gap to be created in the cache
-     */
-    minGapWeight: number;
-    /**
-     * trigger a cache setGap() call every N skippable keys
-     */
-    triggerSaveGapWeight: number;
-    /**
-     * timestamp to assess whether we're still inside the validity period to
-     * be allowed to build gaps
-     */
-    initTimestamp: number;
-};
-
-type GapBuildingInfo_NotBuilding = {
-    state: GapBuildingState.NotBuilding;
-    gapCache: GapCacheInterface;
-    params: GapBuildingParams;
-};
-
-type GapBuildingInfo_Building = {
-    state: GapBuildingState.Building;
-    gapCache: GapCacheInterface;
-    params: GapBuildingParams;
-    /**
-     * Gap currently being created
-     */
-    gap: GapSetEntry;
-    /**
-     * total current weight of the gap being created
-     */
-    gapWeight: number;
-};
-
-type GapBuildingInfo = GapBuildingInfo_NothingToBuild
-    | GapBuildingInfo_NotBuilding
-    | GapBuildingInfo_Building;
-
-/**
- * Handle object listing with parameters. This extends the base class Delimiter
- * to return the raw master versions of existing objects.
- */
-export class DelimiterMaster extends Delimiter {
-
-    _gapCaching: GapCachingInfo;
-    _gapBuilding: GapBuildingInfo;
-    _refreshedBuildingParams: GapBuildingParams | null;
-
-    /**
-     * Delimiter listing of master versions.
-     * @param {Object}  parameters            - listing parameters
-     * @param {String}  [parameters.delimiter]  - delimiter per amazon format
-     * @param {String}  [parameters.prefix]     - prefix per amazon format
-     * @param {String}  [parameters.marker]     - marker per amazon format
-     * @param {Number}  [parameters.maxKeys]    - number of keys to list
-     * @param {Boolean} [parameters.v2]         - indicates whether v2 format
-     * @param {String}  [parameters.startAfter] - marker per amazon v2 format
-     * @param {String}  [parameters.continuationToken] - obfuscated amazon token
-     * @param {RequestLogger} logger            - The logger of the request
-     * @param {String}  [vFormat="v0"]          - versioning key format
-     */
-    constructor(parameters, logger, vFormat?: string) {
-        super(parameters, logger, vFormat);
-
-        if (this.vFormat === BucketVersioningKeyFormat.v0) {
-            // override Delimiter's implementation of NotSkipping for
-            // DelimiterMaster logic (skipping versions and special
-            // handling of delete markers and PHDs)
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefixNorVersionsV0.bind(this));
-
-            // add extra state handlers specific to DelimiterMaster with v0 format
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.SkippingVersionsV0,
-                this.keyHandler_SkippingVersionsV0.bind(this));
-
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-                this.keyHandler_WaitVersionAfterPHDV0.bind(this));
-
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.SkippingGapV0,
-                this.keyHandler_SkippingGapV0.bind(this));
-
-            if (this.marker) {
-                // distinct initial state to include some special logic
-                // before the first master key is found that does not have
-                // to be checked afterwards
-                this.state = <DelimiterMasterFilterState_SkippingVersionsV0> {
-                    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-                    masterKey: this.marker,
-                };
-            } else {
-                this.state = <DelimiterFilterState_NotSkipping> {
-                    id: DelimiterFilterStateId.NotSkipping,
-                };
-            }
-        } else {
-            // save base implementation of the `NotSkipping` state in
-            // Delimiter before overriding it with ours, to be able to call it from there
-            this.keyHandler_NotSkipping_Delimiter = this.keyHandlers[DelimiterFilterStateId.NotSkipping];
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefixNorVersionsV1.bind(this));
-        }
-        // in v1, we can directly use Delimiter's implementation,
-        // which is already set to the proper state
-
-        // default initialization of the gap cache and building states, can be
-        // set by refreshGapCache()
-        this._gapCaching = {
-            state: GapCachingState.NoGapCache,
-        };
-        this._gapBuilding = {
-            state: GapBuildingState.Disabled,
-        };
-        this._refreshedBuildingParams = null;
-    }
-
-    /**
-     * Get the validity period left before a refresh of the gap cache is needed
-     * to continue building new gaps.
-     *
-     * @return {number|null} one of:
-     * - the remaining time in milliseconds in which gaps can be added to the
-     *   cache before a call to refreshGapCache() is required
-     * - or 0 if there is no time left and a call to refreshGapCache() is required
-     *   to resume caching gaps
-     * - or null if refreshing the cache is never needed (because the gap cache
-     *   is either not available or not used)
-     */
-    getGapBuildingValidityPeriodMs(): number | null {
-        let gapBuilding;
-        switch (this._gapBuilding.state) {
-        case GapBuildingState.Disabled:
-            return null;
-        case GapBuildingState.Expired:
-            return 0;
-        case GapBuildingState.NotBuilding:
-            gapBuilding = <GapBuildingInfo_NotBuilding> this._gapBuilding;
-            break;
-        case GapBuildingState.Building:
-            gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-            break;
-        }
-        const { gapCache, params } = gapBuilding;
-        const elapsedTime = Date.now() - params.initTimestamp;
-        return Math.max(gapCache.exposureDelayMs - elapsedTime, 0);
-    }
-
-    /**
-     * Refresh the gaps caching logic (gaps are series of current delete markers
-     * in V0 bucket metadata format). It has two effects:
-     *
-     * - starts exposing existing and future gaps from the cache to efficiently
-     *   skip over series of current delete markers that have been seen and cached
-     *   earlier
-     *
-     * - enables building and caching new gaps (or extend existing ones), for a
-     *   limited time period defined by the `gapCacheProxy.exposureDelayMs` value
-     *   in milliseconds. To refresh the validity period and resume building and
-     *   caching new gaps, one must restart a new listing from the database (starting
-     *   at the current listing key, included), then call refreshGapCache() again.
-     *
-     * @param {GapCacheInterface} gapCacheProxy - API proxy to the gaps cache
-     *   (the proxy should handle prefixing object keys with the bucket name)
-     * @param {number} [minGapWeight=100] - minimum weight of a gap for it to be
-     *   added in the cache
-     * @param {number} [triggerSaveGapWeight] - cumulative weight to wait for
-     *   before saving the current building gap. Cannot be greater than
-     *   `gapCacheProxy.maxGapWeight` (the value is thresholded to `maxGapWeight`
-     *   otherwise). Defaults to `gapCacheProxy.maxGapWeight / 2`.
-     * @return {undefined}
-     */
-    refreshGapCache(
-        gapCacheProxy: GapCacheInterface,
-        minGapWeight?: number,
-        triggerSaveGapWeight?: number
-    ): void {
-        if (this.vFormat !== BucketVersioningKeyFormat.v0) {
-            return;
-        }
-        if (this._gapCaching.state === GapCachingState.NoGapCache) {
-            this._gapCaching = {
-                state: GapCachingState.UnknownGap,
-                gapCache: gapCacheProxy,
-            };
-        }
-        const refreshedBuildingParams: GapBuildingParams = {
-            minGapWeight: minGapWeight || 100,
-            triggerSaveGapWeight: triggerSaveGapWeight
-                || Math.trunc(gapCacheProxy.maxGapWeight / 2),
-            initTimestamp: Date.now(),
-        };
-        if (this._gapBuilding.state === GapBuildingState.Building) {
-            // refreshed params will be applied as soon as the current building gap is saved
-            this._refreshedBuildingParams = refreshedBuildingParams;
-        } else {
-            this._gapBuilding = {
-                state: GapBuildingState.NotBuilding,
-                gapCache: gapCacheProxy,
-                params: refreshedBuildingParams,
-            };
-        }
-    }
-
-    /**
-     * Trigger a lookup of the closest upcoming or already skippable gap.
-     *
-     * @param {string} fromKey - lookup a gap not before 'fromKey'
-     * @return {undefined} - the lookup is asynchronous and its
-     * response is handled inside this function
-     */
-    _triggerGapLookup(gapCaching: GapCachingInfo_NoCachedGap, fromKey: string): void {
-        this._gapCaching = {
-            state: GapCachingState.GapLookupInProgress,
-            gapCache: gapCaching.gapCache,
-        };
-        const maxKey = this.prefix ? inc(this.prefix) : undefined;
-        gapCaching.gapCache.lookupGap(fromKey, maxKey).then(_gap => {
-            const gap = <GapSetEntry | null> _gap;
-            if (gap) {
-                this._gapCaching = {
-                    state: GapCachingState.GapCached,
-                    gapCache: gapCaching.gapCache,
-                    gapCached: gap,
-                };
-            } else {
-                this._gapCaching = {
-                    state: GapCachingState.NoMoreGap,
-                };
-            }
-        });
-    }
-
-    _checkGapOnMasterDeleteMarker(key: string): FilterReturnValue {
-        switch (this._gapBuilding.state) {
-        case GapBuildingState.Disabled:
-        case GapBuildingState.Expired:
-            break;
-        case GapBuildingState.NotBuilding:
-            this._createBuildingGap(key, 1);
-            break;
-        case GapBuildingState.Building:
-            this._updateBuildingGap(key);
-            break;
-        }
-        if (this._gapCaching.state === GapCachingState.GapCached) {
-            const { gapCached } = this._gapCaching;
-            if (key >= gapCached.firstKey) {
-                if (key <= gapCached.lastKey) {
-                    // we are inside the last looked up cached gap: transition to
-                    // 'SkippingGapV0' state
-                    this.setState(<DelimiterMasterFilterState_SkippingGapV0> {
-                        id: DelimiterMasterFilterStateId.SkippingGapV0,
-                    });
-                    // cut the current gap before skipping, it will be merged or
-                    // chained with the existing one (depending on its weight)
-                    if (this._gapBuilding.state === GapBuildingState.Building) {
-                        // substract 1 from the weight because we are going to chain this gap,
-                        // which has an overlap of one key.
-                        this._gapBuilding.gap.weight -= 1;
-                        this._cutBuildingGap();
-                    }
-                    return FILTER_SKIP;
-                }
-                // as we are past the cached gap, we will need another lookup
-                this._gapCaching = {
-                    state: GapCachingState.UnknownGap,
-                    gapCache: this._gapCaching.gapCache,
-                };
-            }
-        }
-        if (this._gapCaching.state === GapCachingState.UnknownGap) {
-            this._triggerGapLookup(this._gapCaching, key);
-        }
-        return FILTER_ACCEPT;
-    }
-
-    filter_onNewMasterKeyV0(key: string, value: string): FilterReturnValue {
-        // if this master key is a delete marker, accept it without
-        // adding the version to the contents
-        if (Version.isDeleteMarker(value)) {
-            // update the state to start skipping versions of the new master key
-            this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-                id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-                masterKey: key,
-            });
-            return this._checkGapOnMasterDeleteMarker(key);
-        }
-        if (Version.isPHD(value)) {
-            // master version is a PHD version: wait for the first
-            // following version that will be considered as the actual
-            // master key
-            this.setState(<DelimiterMasterFilterState_WaitVersionAfterPHDV0> {
-                id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-                masterKey: key,
-            });
-            return FILTER_ACCEPT;
-        }
-        // cut the current gap as soon as a non-deleted entry is seen
-        this._cutBuildingGap();
-
-        if (key.startsWith(DbPrefixes.Replay)) {
-            // skip internal replay prefix entirely
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: DbPrefixes.Replay,
-            });
-            return FILTER_SKIP;
-        }
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-
-        const commonPrefix = this.addCommonPrefixOrContents(key, value);
-        if (commonPrefix) {
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-            return FILTER_ACCEPT;
-        }
-        // update the state to start skipping versions of the new master key
-        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-            masterKey: key,
-        });
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_NotSkippingPrefixNorVersionsV0(key: string, value: string): FilterReturnValue {
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    filter_onNewMasterKeyV1(key: string, value: string): FilterReturnValue {
-        // if this master key is a delete marker, accept it without
-        // adding the version to the contents
-        if (Version.isDeleteMarker(value)) {
-            return FILTER_ACCEPT;
-        }
-        // use base Delimiter's implementation
-        return this.keyHandler_NotSkipping_Delimiter(key, value);
-    }
-
-    keyHandler_NotSkippingPrefixNorVersionsV1(key: string, value: string): FilterReturnValue {
-        return this.filter_onNewMasterKeyV1(key, value);
-    }
-
-    keyHandler_SkippingVersionsV0(key: string, value: string): FilterReturnValue {
-        /* In the SkippingVersionsV0 state, skip all version keys
-         * (<key><versionIdSeparator><version>) */
-        const versionIdIndex = key.indexOf(VID_SEP);
-        if (versionIdIndex !== -1) {
-            // version keys count in the building gap weight because they must
-            // also be listed until skipped
-            if (this._gapBuilding.state === GapBuildingState.Building) {
-                this._updateBuildingGap(key);
-            }
-            return FILTER_SKIP;
-        }
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    keyHandler_WaitVersionAfterPHDV0(key: string, value: string): FilterReturnValue {
-        // After a PHD key is encountered, the next version key of the
-        // same object if it exists is the new master key, hence
-        // consider it as such and call 'onNewMasterKeyV0' (the test
-        // 'masterKey == phdKey' is probably redundant when we already
-        // know we have a versioned key, since all objects in v0 have
-        // a master key, but keeping it in doubt)
-        const { masterKey: phdKey } = <DelimiterMasterFilterState_WaitVersionAfterPHDV0> this.state;
-        const versionIdIndex = key.indexOf(VID_SEP);
-        if (versionIdIndex !== -1) {
-            const masterKey = key.slice(0, versionIdIndex);
-            if (masterKey === phdKey) {
-                return this.filter_onNewMasterKeyV0(masterKey, value);
-            }
-        }
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    keyHandler_SkippingGapV0(key: string, value: string): FilterReturnValue {
-        const { gapCache, gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
-        if (key <= gapCached.lastKey) {
-            return FILTER_SKIP;
-        }
-        this._gapCaching = {
-            state: GapCachingState.UnknownGap,
-            gapCache,
-        };
-        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-        });
-        // Start a gap with weight=0 from the latest skippable key. This will
-        // allow to extend the gap just skipped with a chained gap in case
-        // other delete markers are seen after the existing gap is skipped.
-        this._createBuildingGap(gapCached.lastKey, 0, gapCached.weight);
-
-        return this.handleKey(key, value);
-    }
-
-    skippingBase(): string | undefined {
-        switch (this.state.id) {
-        case DelimiterMasterFilterStateId.SkippingVersionsV0:
-            const { masterKey } = <DelimiterMasterFilterState_SkippingVersionsV0> this.state;
-            return masterKey + inc(VID_SEP);
-
-        case DelimiterMasterFilterStateId.SkippingGapV0:
-            const { gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
-            return gapCached.lastKey;
-
-        default:
-            return super.skippingBase();
-        }
-    }
-
-    result(): ResultObject {
-        this._cutBuildingGap();
-        return super.result();
-    }
-
-    _checkRefreshedBuildingParams(params: GapBuildingParams): GapBuildingParams {
-        if (this._refreshedBuildingParams) {
-            const newParams = this._refreshedBuildingParams;
-            this._refreshedBuildingParams = null;
-            return newParams;
-        }
-        return params;
-    }
-
-    /**
-     * Save the gap being built if allowed (i.e. still within the
-     * allocated exposure time window).
-     *
-     * @return {boolean} - true if the gap was saved, false if we are
-     * outside the allocated exposure time window.
-     */
-    _saveBuildingGap(): boolean {
-        const { gapCache, params, gap, gapWeight } =
-              <GapBuildingInfo_Building> this._gapBuilding;
-        const totalElapsed = Date.now() - params.initTimestamp;
-        if (totalElapsed >= gapCache.exposureDelayMs) {
-            this._gapBuilding = {
-                state: GapBuildingState.Expired,
-            };
-            this._refreshedBuildingParams = null;
-            return false;
-        }
-        const { firstKey, lastKey, weight } = gap;
-        gapCache.setGap(firstKey, lastKey, weight);
-        this._gapBuilding = {
-            state: GapBuildingState.Building,
-            gapCache,
-            params: this._checkRefreshedBuildingParams(params),
-            gap: {
-                firstKey: gap.lastKey,
-                lastKey: gap.lastKey,
-                weight: 0,
-            },
-            gapWeight,
-        };
-        return true;
-    }
-
-    /**
-     * Create a new gap to be extended afterwards
-     *
-     * @param {string} newKey - gap's first key
-     * @param {number} startWeight - initial weight of the building gap (usually 0 or 1)
-     * @param {number} [cachedWeight] - if continuing a cached gap, weight of the existing
-     *   cached portion
-     * @return {undefined}
-     */
-    _createBuildingGap(newKey: string, startWeight: number, cachedWeight?: number): void {
-        if (this._gapBuilding.state === GapBuildingState.NotBuilding) {
-            const { gapCache, params } = <GapBuildingInfo_NotBuilding> this._gapBuilding;
-            this._gapBuilding = {
-                state: GapBuildingState.Building,
-                gapCache,
-                params: this._checkRefreshedBuildingParams(params),
-                gap: {
-                    firstKey: newKey,
-                    lastKey: newKey,
-                    weight: startWeight,
-                },
-                gapWeight: (cachedWeight || 0) + startWeight,
-            };
-        }
-    }
-
-    _updateBuildingGap(newKey: string): void {
-        const gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-        const { params, gap } = gapBuilding;
-        gap.lastKey = newKey;
-        gap.weight += 1;
-        gapBuilding.gapWeight += 1;
-        // the GapCache API requires updating a gap regularly because it can only split
-        // it once per update, by the known last key. In practice the default behavior
-        // is to trigger an update after a number of keys that is half the maximum weight.
-        // It is also useful for other listings to benefit from the cache sooner.
-        if (gapBuilding.gapWeight >= params.minGapWeight &&
-            gap.weight >= params.triggerSaveGapWeight) {
-            this._saveBuildingGap();
-        }
-    }
-
-    _cutBuildingGap(): void {
-        if (this._gapBuilding.state === GapBuildingState.Building) {
-            let gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-            let { gapCache, params, gap, gapWeight } = gapBuilding;
-            // only set gaps that are significant enough in weight and
-            // with a non-empty extension
-            if (gapWeight >= params.minGapWeight && gap.weight > 0) {
-                // we're done if we were not allowed to save the gap
-                if (!this._saveBuildingGap()) {
-                    return;
-                }
-                // params may have been refreshed, reload them
-                gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-                params = gapBuilding.params;
-            }
-            this._gapBuilding = {
-                state: GapBuildingState.NotBuilding,
-                gapCache,
-                params,
-            };
-        }
-    }
-}
--- a/lib/algos/list/delimiterNonCurrent.js
+++ b/lib/algos/list/delimiterNonCurrent.js
@ -1,202 +0,0 @@
-const { DelimiterVersions } = require('./delimiterVersions');
-const { FILTER_END, FILTER_SKIP } = require('./tools');
-
-const TRIM_METADATA_MIN_BLOB_SIZE = 10000;
-
-/**
- * Handle object listing with parameters. This extends the base class DelimiterVersions
- * to return the raw non-current versions objects.
- */
-class DelimiterNonCurrent extends DelimiterVersions {
-    /**
-     * Delimiter listing of non-current versions.
-     * @param {Object}  parameters                  - listing parameters
-     * @param {String}  parameters.keyMarker        - key marker
-     * @param {String}  parameters.versionIdMarker  - version id marker
-     * @param {String}  parameters.beforeDate       - limit the response to keys with stale date older than beforeDate.
-     * “stale date” is the date on when a version becomes non-current.
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
-     * @param {String} parameters.excludedDataStoreName - exclude dataStoreName matches from the versions
-     * @param {RequestLogger} logger                - The logger of the request
-     * @param {String} [vFormat]                    - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger, vFormat);
-
-        this.beforeDate = parameters.beforeDate;
-        this.excludedDataStoreName = parameters.excludedDataStoreName;
-        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
-
-        // internal state
-        this.prevKey = null;
-        this.staleDate = null;
-
-        this.scannedKeys = 0;
-    }
-
-    getLastModified(value) {
-        let lastModified;
-        try {
-            const v = JSON.parse(value);
-            lastModified = v['last-modified'];
-        } catch (e) {
-            this.logger.warn('could not parse Object Metadata while listing',
-                {
-                    method: 'getLastModified',
-                    err: e.toString(),
-                });
-        }
-        return lastModified;
-    }
-
-    // Overwrite keyHandler_SkippingVersions to include the last version from the previous listing.
-    // The creation (last-modified) date of this version will be the stale date for the following version.
-    // eslint-disable-next-line camelcase
-    keyHandler_SkippingVersions(key, versionId, value) {
-        if (key === this.keyMarker) {
-            // since the nonversioned key equals the marker, there is
-            // necessarily a versionId in this key
-            const _versionId = versionId;
-            if (_versionId < this.versionIdMarker) {
-                // skip all versions until marker
-                return FILTER_SKIP;
-            }
-        }
-        this.setState({
-            id: 1 /* NotSkipping */,
-        });
-        return this.handleKey(key, versionId, value);
-    }
-
-    filter(obj) {
-        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return FILTER_END;
-        }
-        ++this.scannedKeys;
-        return super.filter(obj);
-    }
-
-    /**
-     * NOTE: Each version of a specific key is sorted from the latest to the oldest
-     * thanks to the way version ids are generated.
-     * DESCRIPTION: Skip the version if it represents the master key, but keep its last-modified date in memory,
-     * which will be the stale date of the following version.
-     * The following version is pushed only:
-     * - if the "stale date" (picked up from the previous version) is available (JSON.parse has not failed),
-     * - if "beforeDate" is not specified or if specified and the "stale date" is older.
-     * - if "excludedDataStoreName" is not specified or if specified and the data store name is different
-     * The in-memory "stale date" is then updated with the version's last-modified date to be used for
-     * the following version.
-     * The process stops and returns the available results if either:
-     * - no more metadata key is left to be processed
-     * - the listing reaches the maximum number of key to be returned
-     * - the internal timeout is reached
-     *  @param {String} key   - The key to add
-     *  @param {String} versionId - The version id
-     *  @param {String} value - The value of the key
-     *  @return {undefined}
-     */
-    addVersion(key, versionId, value) {
-        this.nextKeyMarker = key;
-        this.nextVersionIdMarker = versionId;
-
-        // Skip the version if it represents the non-current version, but keep its last-modified date,
-        // which will be the stale date of the following version.
-        const isCurrentVersion = key !== this.prevKey;
-        if (isCurrentVersion) {
-            this.staleDate = this.getLastModified(value);
-            this.prevKey = key;
-            return;
-        }
-
-        // The following version is pushed only:
-        // - if the "stale date" (picked up from the previous version) is available (JSON.parse has not failed),
-        // - if "beforeDate" is not specified or if specified and the "stale date" is older.
-        // - if "excludedDataStoreName" is not specified or if specified and the data store name is different
-        let lastModified;
-        if (this.staleDate && (!this.beforeDate || this.staleDate < this.beforeDate)) {
-            const parsedValue = this._parse(value);
-            // if parsing fails, skip the key.
-            if (parsedValue) {
-                const dataStoreName = parsedValue.dataStoreName;
-                lastModified = parsedValue['last-modified'];
-                if (!this.excludedDataStoreName || dataStoreName !== this.excludedDataStoreName) {
-                    const s = this._stringify(parsedValue, this.staleDate);
-                    // check that _stringify succeeds to only push objects with a defined staleDate.
-                    if (s) {
-                        this.Versions.push({ key, value: s });
-                        ++this.keys;
-                    }
-                }
-            }
-        }
-
-        // The in-memory "stale date" is then updated with the version's last-modified date to be used for
-        // the following version.
-        this.staleDate = lastModified || this.getLastModified(value);
-
-        return;
-    }
-
-    /**
-     * Parses the stringified entry's value and remove the location property if too large.
-     * @param {string} s - sringified value
-     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
-     */
-    _parse(s) {
-        let p;
-        try {
-            p = JSON.parse(s);
-            if (s.length >= TRIM_METADATA_MIN_BLOB_SIZE) {
-                delete p.location;
-            }
-        } catch (e) {
-            this.logger.warn('Could not parse Object Metadata while listing', {
-                method: 'DelimiterNonCurrent._parse',
-                err: e.toString(),
-            });
-        }
-        return p;
-    }
-
-    _stringify(parsedMD, staleDate) {
-        const p = parsedMD;
-        let s = undefined;
-        p.staleDate = staleDate;
-        try {
-            s = JSON.stringify(p);
-        } catch (e) {
-            this.logger.warn('could not stringify Object Metadata while listing', {
-                method: 'DelimiterNonCurrent._stringify',
-                err: e.toString(),
-            });
-        }
-        return s;
-    }
-
-    result() {
-        const { Versions, IsTruncated, NextKeyMarker, NextVersionIdMarker } = super.result();
-
-        const result = {
-            Contents: Versions,
-            IsTruncated,
-        };
-
-        if (NextKeyMarker) {
-            result.NextKeyMarker = NextKeyMarker;
-        }
-
-        if (NextVersionIdMarker) {
-            result.NextVersionIdMarker = NextVersionIdMarker;
-        }
-
-        return result;
-    }
-}
-module.exports = { DelimiterNonCurrent };
--- a/lib/algos/list/delimiterOrphanDeleteMarker.js
+++ b/lib/algos/list/delimiterOrphanDeleteMarker.js
@ -1,204 +0,0 @@
-const DelimiterVersions = require('./delimiterVersions').DelimiterVersions;
-const { FILTER_END } = require('./tools');
-const TRIM_METADATA_MIN_BLOB_SIZE = 10000;
-/**
- * Handle object listing with parameters. This extends the base class DelimiterVersions
- * to return the orphan delete markers. Orphan delete markers are also
- * refered as expired object delete marker.
- * They are delete marker with zero noncurrent versions.
- */
-class DelimiterOrphanDeleteMarker extends DelimiterVersions {
-    /**
-     * Delimiter listing of orphan delete markers.
-     * @param {Object}  parameters            - listing parameters
-     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
-     * @param {RequestLogger} logger          - The logger of the request
-     * @param {String} [vFormat]              - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        const {
-            marker,
-            maxKeys,
-            prefix,
-            beforeDate,
-            maxScannedLifecycleListingEntries,
-        } = parameters;
-
-        const versionParams = {
-            // The orphan delete marker logic uses the term 'marker' instead of 'keyMarker',
-            // as the latter could suggest the presence of a 'versionIdMarker'.
-            keyMarker: marker,
-            maxKeys,
-            prefix,
-        };
-        super(versionParams, logger, vFormat);
-
-        this.maxScannedLifecycleListingEntries = maxScannedLifecycleListingEntries;
-        this.beforeDate = beforeDate;
-        // this.prevKeyName is used as a marker for the next listing when the current one reaches its entry limit.
-        // We cannot rely on this.keyName, as it contains the name of the current key.
-        // In the event of a listing interruption due to reaching the maximum scanned entries,
-        // relying on this.keyName would cause the next listing to skip the current key because S3 starts
-        // listing after the marker.
-        this.prevKeyName = null;
-        this.keyName = null;
-        this.value = null;
-        this.scannedKeys = 0;
-    }
-
-    _reachedMaxKeys() {
-        if (this.keys >= this.maxKeys) {
-            return true;
-        }
-        return false;
-    }
-
-    _addOrphan() {
-        const parsedValue = this._parse(this.value);
-        // if parsing fails, skip the key.
-        if (parsedValue) {
-            const lastModified = parsedValue['last-modified'];
-            const isDeleteMarker = parsedValue.isDeleteMarker;
-            // We then check if the orphan version is a delete marker and if it is older than the "beforeDate"
-            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) && isDeleteMarker) {
-                // Prefer returning an untrimmed data rather than stopping the service in case of parsing failure.
-                const s = this._stringify(parsedValue) || this.value;
-                this.Versions.push({ key: this.keyName, value: s });
-                this.nextKeyMarker = this.keyName;
-                ++this.keys;
-            }
-        }
-    }
-
-    /**
-     * Parses the stringified entry's value and remove the location property if too large.
-     * @param {string} s - sringified value
-     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
-     */
-    _parse(s) {
-        let p;
-        try {
-            p = JSON.parse(s);
-            if (s.length >= TRIM_METADATA_MIN_BLOB_SIZE) {
-                delete p.location;
-            }
-        } catch (e) {
-            this.logger.warn('Could not parse Object Metadata while listing', {
-                method: 'DelimiterOrphanDeleteMarker._parse',
-                err: e.toString(),
-            });
-        }
-        return p;
-    }
-
-    _stringify(value) {
-        const p = value;
-        let s = undefined;
-        try {
-            s = JSON.stringify(p);
-        } catch (e) {
-            this.logger.warn('could not stringify Object Metadata while listing',
-                {
-                    method: 'DelimiterOrphanDeleteMarker._stringify',
-                    err: e.toString(),
-                });
-        }
-        return s;
-    }
-    /**
-     * The purpose of _isMaxScannedEntriesReached is to restrict the number of scanned entries,
-     * thus controlling resource overhead (CPU...).
-     * @return {boolean} isMaxScannedEntriesReached - true if the maximum limit on the number
-     * of entries scanned has been reached, false otherwise.
-    */
-    _isMaxScannedEntriesReached() {
-        return this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries;
-    }
-
-    filter(obj) {
-        if (this._isMaxScannedEntriesReached()) {
-            this.nextKeyMarker = this.prevKeyName;
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return FILTER_END;
-        }
-        ++this.scannedKeys;
-        return super.filter(obj);
-    }
-
-    /**
-     * NOTE: Each version of a specific key is sorted from the latest to the oldest
-     * thanks to the way version ids are generated.
-     * DESCRIPTION: For a given key, the latest version is kept in memory since it is the current version.
-     * If the following version reference a new key, it means that the previous one was an orphan version.
-     * We then check if the orphan version is a delete marker and if it is older than the "beforeDate"
-     * The process stops and returns the available results if either:
-     * - no more metadata key is left to be processed
-     * - the listing reaches the maximum number of key to be returned
-     * - the internal timeout is reached
-     * NOTE: we cannot leverage MongoDB to list keys older than "beforeDate"
-     * because then we will not be able to assess its orphanage.
-     *  @param {String} key   - The object key.
-     * @param {String} versionId   - The object version id.
-     *  @param {String} value - The value of the key
-     *  @return {undefined}
-     */
-    addVersion(key, versionId, value) {
-        // For a given key, the youngest version is kept in memory since it represents the current version.
-        if (key !== this.keyName) {
-            // If this.value is defined, it means that <this.keyName, this.value> pair is "allowed" to be an orphan.
-            if (this.value) {
-                this._addOrphan();
-            }
-            this.prevKeyName = this.keyName;
-            this.keyName = key;
-            this.value = value;
-
-            return;
-        }
-
-        // If the key is not the current version, we can skip it in the next listing
-        // in the case where the current listing is interrupted due to reaching the maximum scanned entries.
-        this.prevKeyName = key;
-        this.keyName = key;
-        this.value = null;
-
-        return;
-    }
-
-    result() {
-        // Only check for remaining last orphan delete marker if the listing is not interrupted.
-        // This will help avoid false positives.
-        if (!this._isMaxScannedEntriesReached()) {
-            // The following check makes sure the last orphan delete marker is not forgotten.
-            if (this.keys < this.maxKeys) {
-                if (this.value) {
-                    this._addOrphan();
-                }
-            // The following make sure that if makeKeys is reached, isTruncated is set to true.
-            // We moved the "isTruncated" from _reachedMaxKeys to make sure we take into account the last entity
-            // if listing is truncated right before the last entity and the last entity is a orphan delete marker.
-            } else {
-                this.IsTruncated = this.maxKeys > 0;
-            }
-        }
-
-        const result = {
-            Contents: this.Versions,
-            IsTruncated: this.IsTruncated,
-        };
-
-        if (this.IsTruncated) {
-            result.NextMarker = this.nextKeyMarker;
-        }
-
-        return result;
-    }
-}
-
-module.exports = { DelimiterOrphanDeleteMarker };
--- a/lib/algos/list/delimiterVersions.ts
+++ b/lib/algos/list/delimiterVersions.ts
@ -1,12 +1,6 @@
 'use strict'; // eslint-disable-line strict

-const Extension = require('./Extension').default;
-
-import {
-    FilterState,
-    FilterReturnValue,
-} from './delimiter';
-
+const Delimiter = require('./delimiter').Delimiter;
 const Version = require('../../versioning/Version').Version;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { inc, FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } =
@ -15,10 +9,24 @@ const { inc, FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } =
 const VID_SEP = VSConst.VersionId.Separator;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;

+// TODO: when S3C-4682 code is back, cleanup fields, methods and types
+// already present in Delimiter class
+
+export interface FilterState {
+    id: number,
+};
+
+export interface FilterReturnValue {
+    FILTER_ACCEPT,
+    FILTER_SKIP,
+    FILTER_END,
+};
+
 export const enum DelimiterVersionsFilterStateId {
    NotSkipping = 1,
    SkippingPrefix = 2,
-    SkippingVersions = 3,
+    WaitForNullKey = 3,
+    SkippingVersions = 4,
 };

 export interface DelimiterVersionsFilterState_NotSkipping extends FilterState {
@ -30,12 +38,16 @@ export interface DelimiterVersionsFilterState_SkippingPrefix extends FilterState
    prefix: string;
 };

+export interface DelimiterVersionsFilterState_WaitForNullKey extends FilterState {
+    id: DelimiterVersionsFilterStateId.WaitForNullKey,
+};
+
 export interface DelimiterVersionsFilterState_SkippingVersions extends FilterState {
    id: DelimiterVersionsFilterStateId.SkippingVersions,
    gt: string;
 };

-type KeyHandler = (key: string, versionId: string | undefined, value: string) => FilterReturnValue;
+type KeyHandler = (key: string, value: string) => FilterReturnValue;

 type ResultObject = {
    CommonPrefixes: string[],
@ -68,17 +80,13 @@ type GenMDParamsItem = {
 * @prop {String|undefined} prefix     - prefix per amazon format
 * @prop {Number} maxKeys              - number of keys to list
 */
-export class DelimiterVersions extends Extension {
+export class DelimiterVersions extends Delimiter {

    state: FilterState;
    keyHandlers: { [id: number]: KeyHandler };

    constructor(parameters, logger, vFormat) {
-        super(parameters, logger);
-        // original listing parameters
-        this.delimiter = parameters.delimiter;
-        this.prefix = parameters.prefix;
-        this.maxKeys = parameters.maxKeys || 1000;
+        super(parameters, logger, vFormat);
        // specific to version listing
        this.keyMarker = parameters.keyMarker;
        this.versionIdMarker = parameters.versionIdMarker;
@ -86,11 +94,7 @@ export class DelimiterVersions extends Extension {
        this.masterKey = undefined;
        this.masterVersionId = undefined;
        this.nullKey = null;
-        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
        // listing results
-        this.CommonPrefixes = [];
-        this.Versions = [];
-        this.IsTruncated = false;
        this.nextKeyMarker = parameters.keyMarker;
        this.nextVersionIdMarker = undefined;

@ -122,14 +126,17 @@ export class DelimiterVersions extends Extension {
            DelimiterVersionsFilterStateId.SkippingPrefix,
            this.keyHandler_SkippingPrefix.bind(this));

+        this.setKeyHandler(
+            DelimiterVersionsFilterStateId.WaitForNullKey,
+            this.keyHandler_WaitForNullKey.bind(this));
+
        this.setKeyHandler(
            DelimiterVersionsFilterStateId.SkippingVersions,
            this.keyHandler_SkippingVersions.bind(this));

        if (this.versionIdMarker) {
-            this.state = <DelimiterVersionsFilterState_SkippingVersions> {
-                id: DelimiterVersionsFilterStateId.SkippingVersions,
-                gt: `${this.keyMarker}${VID_SEP}${this.versionIdMarker}`,
+            this.state = <DelimiterVersionsFilterState_WaitForNullKey> {
+                id: DelimiterVersionsFilterStateId.WaitForNullKey,
            };
        } else {
            this.state = <DelimiterVersionsFilterState_NotSkipping> {
@ -194,20 +201,6 @@ export class DelimiterVersions extends Extension {
        return [mParams, vParams];
    }

-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.keys >= this.maxKeys) {
-            // In cases of maxKeys <= 0 -> IsTruncated = false
-            this.IsTruncated = this.maxKeys > 0;
-            return true;
-        }
-        return false;
-    }
-
    /**
     * Used to synchronize listing of M and V prefixes by object key
     *
@ -243,30 +236,6 @@ export class DelimiterVersions extends Extension {
        return { key: nonversionedKey, versionId };
    }

-    /**
-     * Include a key in the listing output, in the Versions or CommonPrefix result
-     *
-     * @param {string} key - key (without version ID)
-     * @param {string} versionId - version ID
-     * @param {string} value - metadata value
-     * @return {undefined}
-     */
-    addKey(key: string, versionId: string, value: string) {
-        // add the subprefix to the common prefixes if the key has the delimiter
-        const commonPrefix = this.getCommonPrefix(key);
-        if (commonPrefix) {
-            this.addCommonPrefix(commonPrefix);
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
-                id: DelimiterVersionsFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-        } else {
-            this.addVersion(key, versionId, value);
-        }
-    }
-
    /**
     *  Add a (key, versionId, value) tuple to the listing.
     *  Set the NextMarker to the current key
@ -276,8 +245,8 @@ export class DelimiterVersions extends Extension {
     *  @param {String} value       - The value of the key
     *  @return {undefined}
     */
-    addVersion(key: string, versionId: string, value: string) {
-        this.Versions.push({
+    addContents(key: string, versionId: string, value: string) {
+        this.Contents.push({
            key,
            versionId,
            value: this.trimMetadata(value),
@ -309,7 +278,6 @@ export class DelimiterVersions extends Extension {
        this.CommonPrefixes.push(commonPrefix);
        ++this.keys;
        this.nextKeyMarker = commonPrefix;
-        this.nextVersionIdMarker = undefined;
    }

    /**
@ -325,6 +293,21 @@ export class DelimiterVersions extends Extension {
        this.nullKey = { key, versionId, value };
    }

+    /**
+     * Add the cached null key to the results. This is called when
+     * reaching the correct position for the null key in the output.
+     *
+     * @return {undefined}
+     */
+    addCurrentNullKey(): void {
+        this.addContents(
+            this.nullKey.key,
+            this.nullKey.versionId,
+            this.nullKey.value,
+        );
+        this.nullKey = null;
+    }
+
    getObjectKeyV0(obj: { key: string }): string {
        return obj.key;
    }
@ -348,24 +331,7 @@ export class DelimiterVersions extends Extension {
        const key = this.getObjectKey(obj);
        const value = obj.value;

-        const { key: nonversionedKey, versionId: keyVersionId } = this.parseKey(key);
-        if (this.nullKey) {
-            if (this.nullKey.key !== nonversionedKey
-                || this.nullKey.versionId < <string> keyVersionId) {
-                this.handleKey(
-                    this.nullKey.key, this.nullKey.versionId, this.nullKey.value);
-                this.nullKey = null;
-            }
-        }
-        if (keyVersionId === '') {
-            // null key
-            this.cacheNullKey(nonversionedKey, Version.from(value).getVersionId(), value);
-            if (this.state.id === DelimiterVersionsFilterStateId.SkippingVersions) {
-                return FILTER_SKIP;
-            }
-            return FILTER_ACCEPT;
-        }
-        return this.handleKey(nonversionedKey, keyVersionId, value);
+        return this.handleKey(key, value);
    }

    setState(state: FilterState): void {
@ -376,11 +342,11 @@ export class DelimiterVersions extends Extension {
        this.keyHandlers[stateId] = keyHandler;
    }

-    handleKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        return this.keyHandlers[this.state.id](key, versionId, value);
+    handleKey(key: string, value: string): FilterReturnValue {
+        return this.keyHandlers[this.state.id](key, value);
    }

-    keyHandler_NotSkippingV0(key: string, versionId: string | undefined, value: string): FilterReturnValue {
+    keyHandler_NotSkippingV0(key: string, value: string): FilterReturnValue {
        if (key.startsWith(DbPrefixes.Replay)) {
            // skip internal replay prefix entirely
            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
@ -392,37 +358,63 @@ export class DelimiterVersions extends Extension {
        if (Version.isPHD(value)) {
            return FILTER_ACCEPT;
        }
-        return this.filter_onNewKey(key, versionId, value);
+        return this.filter_onNewKey(key, value);
    }

-    keyHandler_NotSkippingV1(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        // NOTE: this check on PHD is only useful for Artesca, S3C
-        // does not use PHDs in V1 format
-        if (Version.isPHD(value)) {
-            return FILTER_ACCEPT;
-        }
-        return this.filter_onNewKey(key, versionId, value);
+    keyHandler_NotSkippingV1(key: string, value: string): FilterReturnValue {
+        return this.filter_onNewKey(key, value);
    }

-    filter_onNewKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
+    filter_onNewKey(key: string, value: string): FilterReturnValue {
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
-        if (versionId === undefined) {
+        const { key: nonversionedKey, versionId: keyVersionId } = this.parseKey(key);
+        if (this.nullKey &&
+            (this.nullKey.key !== nonversionedKey
+             || this.nullKey.versionId < <string> keyVersionId)) {
+            this.addCurrentNullKey();
+            if (this._reachedMaxKeys()) {
+                // IsTruncated: true is set, which is wanted because
+                // there is at least one more key to output: the one
+                // being processed here
+                return FILTER_END;
+            }
+        }
+        let versionId: string;
+        if (keyVersionId === undefined) {
            this.masterKey = key;
            this.masterVersionId = Version.from(value).getVersionId() || 'null';
-            this.addKey(this.masterKey, this.masterVersionId, value);
+            versionId = this.masterVersionId;
        } else {
-            if (this.masterKey === key && this.masterVersionId === versionId) {
+            if (keyVersionId === '') {
+                // null key
+                this.cacheNullKey(nonversionedKey, Version.from(value).getVersionId(), value);
+                return FILTER_ACCEPT;
+            }
+            if (this.masterKey === nonversionedKey && this.masterVersionId === keyVersionId) {
                // do not add a version key if it is the master version
                return FILTER_ACCEPT;
            }
-            this.addKey(key, versionId, value);
+            versionId = keyVersionId;
        }
+        // add the subprefix to the common prefixes if the key has the delimiter
+        const commonPrefix = this.getCommonPrefix(nonversionedKey);
+        if (commonPrefix) {
+            this.addCommonPrefix(commonPrefix);
+            // transition into SkippingPrefix state to skip all following keys
+            // while they start with the same prefix
+            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
+                id: DelimiterVersionsFilterStateId.SkippingPrefix,
+                prefix: commonPrefix,
+            });
+            return FILTER_ACCEPT;
+        }
+        this.addContents(nonversionedKey, versionId, value);
        return FILTER_ACCEPT;
    }

-    keyHandler_SkippingPrefix(key: string, versionId: string | undefined, value: string): FilterReturnValue {
+    keyHandler_SkippingPrefix(key: string, value: string): FilterReturnValue {
        const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
        if (key.startsWith(prefix)) {
            return FILTER_SKIP;
@ -430,11 +422,39 @@ export class DelimiterVersions extends Extension {
        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
            id: DelimiterVersionsFilterStateId.NotSkipping,
        });
-        return this.handleKey(key, versionId, value);
+        return this.handleKey(key, value);
    }

-    keyHandler_SkippingVersions(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        if (key === this.keyMarker) {
+    keyHandler_WaitForNullKey(key: string, value: string): FilterReturnValue {
+        const { key: nonversionedKey, versionId } = this.parseKey(key);
+        if (nonversionedKey !== this.keyMarker) {
+            this.setState(<DelimiterVersionsFilterState_NotSkipping> {
+                id: DelimiterVersionsFilterStateId.NotSkipping,
+            });
+            return this.handleKey(key, value);
+        }
+        // we may now skip versions until VersionIdMarker
+        this.setState(<DelimiterVersionsFilterState_SkippingVersions> {
+            id: DelimiterVersionsFilterStateId.SkippingVersions,
+            gt: `${this.keyMarker}${VID_SEP}${this.versionIdMarker}`,
+        });
+
+        if (versionId === '') {
+            // only cache the null key if its version is older than
+            // the current version ID marker, otherwise it has already
+            // been output in a previous listing output
+            const nullVersionId = Version.from(value).getVersionId();
+            if (nullVersionId > this.versionIdMarker) {
+                this.cacheNullKey(nonversionedKey, nullVersionId, value);
+            }
+            return FILTER_SKIP;
+        }
+        return this.handleKey(key, value);
+    }
+
+    keyHandler_SkippingVersions(key: string, value: string): FilterReturnValue {
+        const { key: nonversionedKey, versionId } = this.parseKey(key);
+        if (nonversionedKey === this.keyMarker) {
            // since the nonversioned key equals the marker, there is
            // necessarily a versionId in this key
            const _versionId = <string> versionId;
@ -450,21 +470,18 @@ export class DelimiterVersions extends Extension {
        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
            id: DelimiterVersionsFilterStateId.NotSkipping,
        });
-        return this.handleKey(key, versionId, value);
+        return this.handleKey(key, value);
    }

-    skippingBase(): string | undefined {
+    skippingBase() {
        switch (this.state.id) {
        case DelimiterVersionsFilterStateId.SkippingPrefix:
            const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
-            return inc(prefix);
+            return prefix;

        case DelimiterVersionsFilterStateId.SkippingVersions:
            const { gt } = <DelimiterVersionsFilterState_SkippingVersions> this.state;
-            // the contract of skipping() is to return the first key
-            // that can be skipped to, so adding a null byte to skip
-            // over the existing versioned key set in 'gt'
-            return `${gt}\0`;
+            return gt;

        default:
            return SKIP_NONE;
@ -511,12 +528,12 @@ export class DelimiterVersions extends Extension {
        //   does not fit, so we know the result is now truncated
        //   because there remains the null key to be output.
        //
-        if (this.nullKey) {
-            this.handleKey(this.nullKey.key, this.nullKey.versionId, this.nullKey.value);
+        if (this.nullKey && !this._reachedMaxKeys()) {
+            this.addCurrentNullKey();
        }
        const result: ResultObject = {
            CommonPrefixes: this.CommonPrefixes,
-            Versions: this.Versions,
+            Versions: this.Contents,
            IsTruncated: this.IsTruncated,
        };
        if (this.delimiter) {
--- a/lib/algos/list/exportAlgos.js
+++ b/lib/algos/list/exportAlgos.js
@ -6,7 +6,4 @@ module.exports = {
    DelimiterMaster: require('./delimiterMaster')
        .DelimiterMaster,
    MPU: require('./MPU').MultipartUploads,
-    DelimiterCurrent: require('./delimiterCurrent').DelimiterCurrent,
-    DelimiterNonCurrent: require('./delimiterNonCurrent').DelimiterNonCurrent,
-    DelimiterOrphanDeleteMarker: require('./delimiterOrphanDeleteMarker').DelimiterOrphanDeleteMarker,
 };
--- a/lib/algos/list/skip.js
+++ b/lib/algos/list/skip.js
@ -52,21 +52,21 @@ class Skip {
        assert(this.skipRangeCb);

        const filteringResult = this.extension.filter(entry);
-        const skipTo = this.extension.skipping();
+        const skippingRange = this.extension.skipping();

        if (filteringResult === FILTER_END) {
            this.listingEndCb();
        } else if (filteringResult === FILTER_SKIP
-                   && skipTo !== SKIP_NONE) {
+                   && skippingRange !== SKIP_NONE) {
            if (++this.streakLength >= MAX_STREAK_LENGTH) {
                let newRange;
-                if (Array.isArray(skipTo)) {
+                if (Array.isArray(skippingRange)) {
                    newRange = [];
-                    for (let i = 0; i < skipTo.length; ++i) {
-                        newRange.push(skipTo[i]);
+                    for (let i = 0; i < skippingRange.length; ++i) {
+                        newRange.push(this._inc(skippingRange[i]));
                    }
                } else {
-                    newRange = skipTo;
+                    newRange = this._inc(skippingRange);
                }
                /* Avoid to loop on the same range again and again. */
                if (newRange === this.gteParams) {
@ -79,6 +79,16 @@ class Skip {
            this.streakLength = 0;
        }
    }
+
+    _inc(str) {
+        if (!str) {
+            return str;
+        }
+        const lastCharValue = str.charCodeAt(str.length - 1);
+        const lastCharNewValue = String.fromCharCode(lastCharValue + 1);
+
+        return `${str.slice(0, str.length - 1)}${lastCharNewValue}`;
+    }
 }


--- a/lib/auth/Vault.ts
+++ b/lib/auth/Vault.ts
@ -14,7 +14,7 @@ function vaultSignatureCb(
    err: Error | null,
    authInfo: { message: { body: any } },
    log: Logger,
-    callback: (err: Error | null, data?: any, results?: any, params?: any, infos?: any) => void,
+    callback: (err: Error | null, data?: any, results?: any, params?: any) => void,
    streamingV4Params?: any
 ) {
    // vaultclient API guarantees that it returns:
@ -38,9 +38,7 @@ function vaultSignatureCb(
    }
    // @ts-ignore
    log.addDefaultFields(auditLog);
-    return callback(null, userInfo, authorizationResults, streamingV4Params, {
-        accountQuota: info.accountQuota || {},
-    });
+    return callback(null, userInfo, authorizationResults, streamingV4Params);
 }

 export type AuthV4RequestParams = {
@ -300,7 +298,7 @@ export default class Vault {
        callback: (err: Error | null, data?: { [key: string]: string }) => void
    ) {
        log.trace('getting accountIds from Vault based on canonicalIDs',
-            { canonicalIDs });
+        { canonicalIDs });
        this.client.getAccountIds(canonicalIDs,
            // @ts-expect-error
            { reqUid: log.getSerializedUids() },
@ -315,14 +313,14 @@ export default class Vault {
                const result = {};
                /* If the accountId was not found in Vault, do not
            send the canonicalID back to the API */
-                Object.keys(infoFromVault).forEach(key => {
-                    if (infoFromVault[key] !== 'NotFound' &&
+            Object.keys(infoFromVault).forEach(key => {
+                if (infoFromVault[key] !== 'NotFound' &&
                infoFromVault[key] !== 'WrongFormat') {
-                        result[key] = infoFromVault[key];
-                    }
-                });
-                return callback(null, result);
+                    result[key] = infoFromVault[key];
+                }
            });
+            return callback(null, result);
+        });
    }

    /** checkPolicies -- call Vault to evaluate policies
@ -386,19 +384,4 @@ export default class Vault {
            return callback(null, respBody);
        });
    }
-
-    report(log: Logger, callback: (err: Error | null, data?: any) => void) {
-        // call the report function of the client
-        if (!this.client.report) {
-            return callback(null, {});
-        }
-        // @ts-ignore
-        return this.client.report(log.getSerializedUids(), (err: Error | null, obj?: any) => {
-            if (err) {
-                log.debug(`error from ${this.implName}`, { error: err });
-                return callback(err);
-            }
-            return callback(null, obj);
-        });
-    }
 }
--- a/lib/auth/auth.ts
+++ b/lib/auth/auth.ts
@ -9,12 +9,10 @@ import * as constants from '../constants';
 import constructStringToSignV2 from './v2/constructStringToSign';
 import constructStringToSignV4 from './v4/constructStringToSign';
 import { convertUTCtoISO8601 } from './v4/timeUtils';
-import * as vaultUtilities from './backends/in_memory/vaultUtilities';
-import * as inMemoryBackend from './backends/in_memory/Backend';
-import baseBackend from './backends/base';
-import chainBackend from './backends/ChainBackend';
-import validateAuthConfig from './backends/in_memory/validateAuthConfig';
-import AuthLoader from './backends/in_memory/AuthLoader';
+import * as vaultUtilities from './in_memory/vaultUtilities';
+import * as backend from './in_memory/Backend';
+import validateAuthConfig from './in_memory/validateAuthConfig';
+import AuthLoader from './in_memory/AuthLoader';
 import Vault from './Vault';

 let vault: Vault | null = null;
@ -78,7 +76,7 @@ function extractParams(
            version = 'v4';
        } else {
            log.trace('invalid authorization security header',
-                { header: authHeader });
+                      { header: authHeader });
            return { err: errors.AccessDenied };
        }
    } else if (data.Signature) {
@ -93,7 +91,7 @@ function extractParams(
    if (version !== null && method !== null) {
        if (!checkFunctions[version] || !checkFunctions[version][method]) {
            log.trace('invalid auth version or method',
-                { version, authMethod: method });
+                      { version, authMethod: method });
            return { err: errors.NotImplemented };
        }
        log.trace('identified auth method', { version, authMethod: method });
@ -163,20 +161,6 @@ function doAuth(
    return cb(errors.InternalError);
 }

-/**
- * This function will generate a version 4 content-md5 header
- * It looks at the request path to determine what kind of header encoding is required
- *
- * @param path - the request path
- * @param payload - the request payload to hash
- */
-function generateContentMD5Header(
-    path: string,
-    payload: string,
-) {
-    const encoding = path && path.startsWith('/_/backbeat/') ? 'hex' : 'base64';
-    return crypto.createHash('md5').update(payload, 'binary').digest(encoding);
-}
 /**
 * This function will generate a version 4 header
 *
@ -189,7 +173,6 @@ function generateContentMD5Header(
 * @param [proxyPath] - path that gets proxied by reverse proxy
 * @param [sessionToken] - security token if the access/secret keys
 *                                are temporary credentials from STS
- * @param [payload] - body of the request if any
 */
 function generateV4Headers(
    request: any,
@ -197,9 +180,8 @@ function generateV4Headers(
    accessKey: string,
    secretKeyValue: string,
    awsService: string,
-    proxyPath?: string,
-    sessionToken?: string,
-    payload?: string,
+    proxyPath: string,
+    sessionToken: string
 ) {
    Object.assign(request, { headers: {} });
    const amzDate = convertUTCtoISO8601(Date.now());
@ -212,7 +194,7 @@ function generateV4Headers(
    const timestamp = amzDate;
    const algorithm = 'AWS4-HMAC-SHA256';

-    payload = payload || '';
+    let payload = '';
    if (request.method === 'POST') {
        payload = queryString.stringify(data, undefined, undefined, {
            encodeURIComponent,
@ -223,7 +205,6 @@ function generateV4Headers(
    request.setHeader('host', request._headers.host);
    request.setHeader('x-amz-date', amzDate);
    request.setHeader('x-amz-content-sha256', payloadChecksum);
-    request.setHeader('content-md5', generateContentMD5Header(request.path, payload));

    if (sessionToken) {
        request.setHeader('x-amz-security-token', sessionToken);
@ -234,17 +215,16 @@ function generateV4Headers(
        .filter(headerName =>
            headerName.startsWith('x-amz-')
            || headerName.startsWith('x-scal-')
-            || headerName === 'content-md5'
-            || headerName === 'host',
+            || headerName === 'host'
        ).sort().join(';');
    const params = { request, signedHeaders, payloadChecksum,
        credentialScope, timestamp, query: data,
        awsService: service, proxyPath };
    const stringToSign = constructStringToSignV4(params);
    const signingKey = vaultUtilities.calculateSigningKey(secretKeyValue,
-        region,
-        scopeDate,
-        service);
+                                                          region,
+                                                          scopeDate,
+                                                          service);
    const signature = crypto.createHmac('sha256', signingKey)
        .update(stringToSign as string, 'binary').digest('hex');
    const authorizationHeader = `${algorithm} Credential=${accessKey}` +
@ -256,8 +236,7 @@ function generateV4Headers(

 export const server = { extractParams, doAuth }
 export const client = { generateV4Headers, constructStringToSignV2 }
-export const inMemory = { backend: inMemoryBackend, validateAuthConfig, AuthLoader }
-export const backends = { baseBackend, chainBackend }
+export const inMemory = { backend, validateAuthConfig, AuthLoader }
 export {
    setAuthHandler as setHandler,
    AuthInfo,
--- a/lib/auth/backends/ChainBackend.ts
+++ b/lib/auth/backends/ChainBackend.ts
@ -1,233 +0,0 @@
-import assert from 'assert';
-import async from 'async';
-import errors from '../../errors';
-import BaseBackend from './base';
-
-/**
- * Class that provides an authentication backend that will verify signatures
- * and retrieve emails and canonical ids associated with an account using a
- * given list of authentication backends and vault clients.
- *
- * @class ChainBackend
- */
-export default class ChainBackend extends BaseBackend {
-    _clients: any[];
-
-    /**
-     * @constructor
-     * @param {string} service - service id
-     * @param {object[]} clients - list of authentication backends or vault clients
-     */
-    constructor(service: string, clients: any[]) {
-        super(service);
-
-        assert(Array.isArray(clients) && clients.length > 0, 'invalid client list');
-        assert(clients.every(client =>
-            typeof client.verifySignatureV4 === 'function' &&
-            typeof client.verifySignatureV2 === 'function' &&
-            typeof client.getCanonicalIds === 'function' &&
-            typeof client.getEmailAddresses === 'function' &&
-            typeof client.checkPolicies === 'function' &&
-            typeof client.healthcheck === 'function',
-        ), 'invalid client: missing required auth backend methods');
-        this._clients = clients;
-    }
-
-
-    /*
-     * try task against each client for one to be successful
-     */
-    _tryEachClient(task: any, cb: any) {
-        // @ts-ignore
-        async.tryEach(this._clients.map(client => done => task(client, done)), cb);
-    }
-
-    /*
-     * apply task to all clients
-     */
-    _forEachClient(task: any, cb: any) {
-        async.map(this._clients, task, cb);
-    }
-
-    verifySignatureV2(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        options: any,
-        callback: any,
-      ) {
-        this._tryEachClient((client, done) => client.verifySignatureV2(
-            stringToSign,
-            signatureFromRequest,
-            accessKey,
-            options,
-            done,
-        ), callback);
-    }
-
-    verifySignatureV4(
-      stringToSign: string,
-      signatureFromRequest: string,
-      accessKey: string,
-      region: string,
-      scopeDate: string,
-      options: any,
-      callback: any,
-    ) {
-        this._tryEachClient((client, done) => client.verifySignatureV4(
-            stringToSign,
-            signatureFromRequest,
-            accessKey,
-            region,
-            scopeDate,
-            options,
-            done,
-        ), callback);
-    }
-
-    static _mergeObjects(objectResponses: any) {
-        return objectResponses.reduce(
-            (retObj, resObj) => Object.assign(retObj, resObj.message.body),
-            {});
-    }
-
-    getCanonicalIds(emailAddresses: string[], options: any, callback: any) {
-        this._forEachClient(
-            (client, done) => client.getCanonicalIds(emailAddresses, options, done),
-            (err, res) => {
-                if (err) {
-                    return callback(err);
-                }
-                // TODO: atm naive merge, better handling of conflicting email results
-                return callback(null, {
-                    message: {
-                        body: ChainBackend._mergeObjects(res),
-                    },
-                });
-            });
-    }
-
-    getEmailAddresses(canonicalIDs: string[], options: any, callback: any) {
-        this._forEachClient(
-            (client, done) => client.getEmailAddresses(canonicalIDs, options, done),
-            (err, res) => {
-                if (err) {
-                    return callback(err);
-                }
-                return callback(null, {
-                    message: {
-                        body: ChainBackend._mergeObjects(res),
-                    },
-                });
-            });
-    }
-
-    /*
-     * merge policy responses into a single message
-     */
-    static _mergePolicies(policyResponses: any) {
-        const policyMap: any = {};
-
-        policyResponses.forEach(resp => {
-            if (!resp.message || !Array.isArray(resp.message.body)) {
-                return;
-            }
-
-            const check = (policy) => {
-                const key = (policy.arn || '') + (policy.versionId || '') + (policy.action || '');
-                if (!policyMap[key] || !policyMap[key].isAllowed) {
-                    policyMap[key] = policy;
-                }
-                // else is duplicate policy
-            };
-
-            resp.message.body.forEach(policy => {
-                if (Array.isArray(policy)) {
-                    policy.forEach(authResult => check(authResult));
-                } else {
-                    check(policy);
-                }
-            });
-        });
-
-        return Object.keys(policyMap).map(key => {
-            const policyRes: any = { isAllowed: policyMap[key].isAllowed };
-            if (policyMap[key].arn !== '') {
-                policyRes.arn = policyMap[key].arn;
-            }
-            if (policyMap[key].versionId) {
-                policyRes.versionId = policyMap[key].versionId;
-            }
-            if (policyMap[key].isImplicit !== undefined) {
-                policyRes.isImplicit = policyMap[key].isImplicit;
-            }
-            if (policyMap[key].action) {
-                policyRes.action = policyMap[key].action;
-            }
-            return policyRes;
-        });
-    }
-
-    /*
-        response format:
-            {  message: {
-                body: [{}],
-                code: number,
-                message: string,
-            } }
-     */
-    checkPolicies(requestContextParams: any, userArn: string, options: any, callback: any) {
-        this._forEachClient((client, done) => client.checkPolicies(
-            requestContextParams,
-            userArn,
-            options,
-            done,
-        ), (err, res) => {
-            if (err) {
-                return callback(err);
-            }
-            return callback(null, {
-                message: {
-                    body: ChainBackend._mergePolicies(res),
-                },
-            });
-        });
-    }
-
-    healthcheck(reqUid: string, callback: any) {
-        this._forEachClient((client, done) =>
-            client.healthcheck(reqUid, (err, res) => done(null, {
-                error: !!err ? err : null,
-                status: res,
-            }),
-            ), (err, res) => {
-            if (err) {
-                return callback(err);
-            }
-
-            const isError = res.some(results => !!results.error);
-            if (isError) {
-                return callback(errors.InternalError, res);
-            }
-            return callback(null, res);
-        });
-    }
-
-    report(reqUid: string, callback: any) {
-        this._forEachClient((client, done) =>
-            client.report(reqUid, done),
-            (err, res) => {
-                if (err) {
-                    return callback(err);
-                }
-                const mergedRes = res.reduce((acc, val) => {
-                    Object.keys(val).forEach(k => {
-                        acc[k] = val[k];
-                    });
-                    return acc;
-                }, {});
-
-                return callback(null, mergedRes);
-            });
-    }
-}
--- a/lib/auth/backends/base.ts
+++ b/lib/auth/backends/base.ts
@ -1,96 +0,0 @@
-import errors from '../../errors';
-
-/**
- * Base backend class
- *
- * @class BaseBackend
- */
-export default class BaseBackend {
-    service: string;
-
-    /**
-     * @constructor
-     * @param {string} service - service identifer for construction arn
-     */
-    constructor(service: string) {
-        this.service = service;
-    }
-
-    /** verifySignatureV2
-    * @param stringToSign - string to sign built per AWS rules
-    * @param signatureFromRequest - signature sent with request
-    * @param accessKey - account accessKey
-    * @param options - contains algorithm (SHA1 or SHA256)
-    * @param callback - callback with either error or user info
-    * @return calls callback
-    */
-    verifySignatureV2(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        options: any,
-        callback: any
-    ) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-
-    /** verifySignatureV4
-     * @param stringToSign - string to sign built per AWS rules
-     * @param signatureFromRequest - signature sent with request
-     * @param accessKey - account accessKey
-     * @param region - region specified in request credential
-     * @param scopeDate - date specified in request credential
-     * @param options - options to send to Vault
-     * (just contains reqUid for logging in Vault)
-     * @param callback - callback with either error or user info
-     * @return calls callback
-     */
-    verifySignatureV4(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        region: string,
-        scopeDate: string,
-        options: any,
-        callback: any
-    ) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-    /**
-     * Gets canonical ID's for a list of accounts
-     * based on email associated with account
-     * @param emails - list of email addresses
-     * @param options - to send log id to vault
-     * @param callback - callback to calling function
-     * @returns callback with either error or
-     * object with email addresses as keys and canonical IDs
-     * as values
-     */
-    getCanonicalIds(emails: string[], options: any, callback: any) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-    /**
-     * Gets email addresses (referred to as diplay names for getACL's)
-     * for a list of accounts based on canonical IDs associated with account
-     * @param canonicalIDs - list of canonicalIDs
-     * @param options - to send log id to vault
-     * @param callback - callback to calling function
-     * @returns callback with either error or
-     * an object from Vault containing account canonicalID
-     * as each object key and an email address as the value (or "NotFound")
-     */
-    getEmailAddresses(canonicalIDs: string[], options: any, callback: any) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-    checkPolicies(requestContextParams: any, userArn: string, options: any, callback: any) {
-        return callback(null, { message: { body: [] } });
-    }
-
-    healthcheck(reqUid: string, callback: any) {
-        return callback(null, { code: 200, message: 'OK' });
-    }
-}
--- a/lib/auth/backends/in_memory/AuthLoader.ts
+++ b/lib/auth/backends/in_memory/AuthLoader.ts
@ -4,7 +4,7 @@ import joi from 'joi';
 import werelogs from 'werelogs';
 import * as types from './types';
 import { Account, Accounts } from './types';
-import ARN from '../../../models/ARN';
+import ARN from '../../models/ARN';

 /** Load authentication information from files or pre-loaded account objects */
 export default class AuthLoader {
--- a/lib/auth/backends/in_memory/Backend.ts
+++ b/lib/auth/backends/in_memory/Backend.ts
@ -1,9 +1,7 @@
-import crypto from 'crypto';
-import { Logger } from 'werelogs';
-import errors from '../../../errors';
+import * as crypto from 'crypto';
+import errors from '../../errors';
 import { calculateSigningKey, hashSignature } from './vaultUtilities';
 import Indexer from './Indexer';
-import BaseBackend from '../base';
 import { Accounts } from './types';

 function _formatResponse(userInfoToSend: any) {
@ -17,32 +15,26 @@ function _formatResponse(userInfoToSend: any) {
 /**
 * Class that provides a memory backend for verifying signatures and getting
 * emails and canonical ids associated with an account.
- *
- * @class InMemoryBackend
 */
-class InMemoryBackend extends BaseBackend {
+class Backend {
    indexer: Indexer;
-    formatResponse: any;
+    service: string;

-    /**
-     * @constructor
-     * @param service - service identifer for construction arn
-     * @param indexer - indexer instance for retrieving account info
-     * @param formatter - function which accepts user info to send
-     * back and returns it in an object
-     */
-    constructor(service: string, indexer: Indexer, formatter: typeof _formatResponse) {
-        super(service);
+    constructor(service: string, indexer: Indexer) {
+        this.service = service;
        this.indexer = indexer;
-        this.formatResponse = formatter;
    }

+    // CODEQUALITY-TODO-SYNC Should be synchronous
    verifySignatureV2(
        stringToSign: string,
        signatureFromRequest: string,
        accessKey: string,
-        options: any,
-        callback: any,
+        options: { algo: 'SHA256' | 'SHA1' },
+        callback: (
+            error: Error | null,
+            data?: ReturnType<typeof _formatResponse>
+        ) => void
    ) {
        const entity = this.indexer.getEntityByKey(accessKey);
        if (!entity) {
@ -58,21 +50,27 @@ class InMemoryBackend extends BaseBackend {
            accountDisplayName: this.indexer.getAcctDisplayName(entity),
            canonicalID: entity.canonicalID,
            arn: entity.arn,
+            // TODO Why?
            // @ts-ignore
            IAMdisplayName: entity.IAMdisplayName,
        };
-        const vaultReturnObject = this.formatResponse(userInfoToSend);
+        const vaultReturnObject = _formatResponse(userInfoToSend);
        return callback(null, vaultReturnObject);
    }

+    // TODO Options not used. Why ?
+    // CODEQUALITY-TODO-SYNC Should be synchronous
    verifySignatureV4(
        stringToSign: string,
        signatureFromRequest: string,
        accessKey: string,
        region: string,
        scopeDate: string,
-        options: any,
-        callback: any,
+        _options: { algo: 'SHA256' | 'SHA1' },
+        callback: (
+            err: Error | null,
+            data?: ReturnType<typeof _formatResponse>
+        ) => void
    ) {
        const entity = this.indexer.getEntityByKey(accessKey);
        if (!entity) {
@ -89,14 +87,21 @@ class InMemoryBackend extends BaseBackend {
            accountDisplayName: this.indexer.getAcctDisplayName(entity),
            canonicalID: entity.canonicalID,
            arn: entity.arn,
+            // TODO Why?
            // @ts-ignore
            IAMdisplayName: entity.IAMdisplayName,
        };
-        const vaultReturnObject = this.formatResponse(userInfoToSend);
+        const vaultReturnObject = _formatResponse(userInfoToSend);
        return callback(null, vaultReturnObject);
    }

-    getCanonicalIds(emails: string[], log: Logger, cb: any) {
+    // TODO log not used. Why ?
+    // CODEQUALITY-TODO-SYNC Should be synchronous
+    getCanonicalIds(
+        emails: string[],
+        _log: any,
+        cb: (err: null, data: { message: { body: any } }) => void
+    ) {
        const results = {};
        emails.forEach(email => {
            const lowercasedEmail = email.toLowerCase();
@ -116,7 +121,13 @@ class InMemoryBackend extends BaseBackend {
        return cb(null, vaultReturnObject);
    }

-    getEmailAddresses(canonicalIDs: string[], options: any, cb: any) {
+    // TODO options not used. Why ?
+    // CODEQUALITY-TODO-SYNC Should be synchronous
+    getEmailAddresses(
+        canonicalIDs: string[],
+        _options: any,
+        cb: (err: null, data: { message: { body: any } }) => void
+    ) {
        const results = {};
        canonicalIDs.forEach(canonicalId => {
            const foundEntity = this.indexer.getEntityByCanId(canonicalId);
@ -134,17 +145,24 @@ class InMemoryBackend extends BaseBackend {
        return cb(null, vaultReturnObject);
    }

+    // TODO options not used. Why ?
+    // CODEQUALITY-TODO-SYNC Should be synchronous
    /**
     * Gets accountIds for a list of accounts based on
     * the canonical IDs associated with the account
     * @param canonicalIDs - list of canonicalIDs
-     * @param options - to send log id to vault
+     * @param _options - to send log id to vault
     * @param cb - callback to calling function
-     * @returns callback with either error or
+     * @returns The next is wrong. Here to keep archives.
+     * callback with either error or
     * an object from Vault containing account canonicalID
     * as each object key and an accountId as the value (or "NotFound")
     */
-    getAccountIds(canonicalIDs: string[], options: any, cb: any) {
+    getAccountIds(
+        canonicalIDs: string[],
+        _options: any,
+        cb: (err: null, data: { message: { body: any } }) => void
+    ) {
        const results = {};
        canonicalIDs.forEach(canonicalID => {
            const foundEntity = this.indexer.getEntityByCanId(canonicalID);
@ -161,34 +179,16 @@ class InMemoryBackend extends BaseBackend {
        };
        return cb(null, vaultReturnObject);
    }
-
-    report(log: Logger, callback: any) {
-        return callback(null, {});
-    }
 }

-
-class S3AuthBackend extends InMemoryBackend {
-    /**
-     * @constructor
-     * @param authdata - the authentication config file's data
-     * @param authdata.accounts - array of account objects
-     * @param authdata.accounts[].name - account name
-     * @param authdata.accounts[].email - account email
-     * @param authdata.accounts[].arn - IAM resource name
-     * @param authdata.accounts[].canonicalID - account canonical ID
-     * @param authdata.accounts[].shortid - short account ID
-     * @param authdata.accounts[].keys - array of key objects
-     * @param authdata.accounts[].keys[].access - access key
-     * @param authdata.accounts[].keys[].secret - secret key
-     */
-    constructor(authdata?: Accounts) {
-        super('s3', new Indexer(authdata), _formatResponse);
+class S3AuthBackend extends Backend {
+    constructor(authdata: Accounts) {
+        super('s3', new Indexer(authdata));
    }

-    refreshAuthData(authData?: Accounts) {
+    refreshAuthData(authData: Accounts) {
        this.indexer = new Indexer(authData);
    }
 }

-export { S3AuthBackend as s3 }
+export { S3AuthBackend as s3 };
--- a/lib/auth/backends/in_memory/Indexer.ts
+++ b/lib/auth/backends/in_memory/Indexer.ts
--- a/lib/auth/backends/in_memory/types.ts
+++ b/lib/auth/backends/in_memory/types.ts
--- a/lib/auth/backends/in_memory/validateAuthConfig.ts
+++ b/lib/auth/backends/in_memory/validateAuthConfig.ts
--- a/lib/auth/backends/in_memory/vaultUtilities.ts
+++ b/lib/auth/backends/in_memory/vaultUtilities.ts
--- a/lib/auth/v2/getCanonicalizedAmzHeaders.ts
+++ b/lib/auth/v2/getCanonicalizedAmzHeaders.ts
@ -39,5 +39,5 @@ export default function getCanonicalizedAmzHeaders(headers: Headers, clientType:
    // Build headerString
    return amzHeaders.reduce((headerStr, current) =>
        `${headerStr}${current[0]}:${current[1]}\n`,
-    '');
+        '');
 }
--- a/lib/auth/v2/headerAuthCheck.ts
+++ b/lib/auth/v2/headerAuthCheck.ts
@ -21,9 +21,9 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
    timestamp = Date.parse(timestamp);
    if (!timestamp) {
        log.debug('missing or invalid date header',
-            { method: 'auth/v2/headerAuthCheck.check' });
+        { method: 'auth/v2/headerAuthCheck.check' });
        return { err: errors.AccessDenied.
-            customizeDescription('Authentication requires a valid Date or ' +
+          customizeDescription('Authentication requires a valid Date or ' +
          'x-amz-date header') };
    }

--- a/lib/auth/v2/queryAuthCheck.ts
+++ b/lib/auth/v2/queryAuthCheck.ts
@ -41,12 +41,12 @@ export function check(request: any, log: Logger, data: { [key: string]: string }

    if (expirationTime > currentTime + preSignedURLExpiry) {
        log.debug('expires parameter too far in future',
-            { expires: request.query.Expires });
+        { expires: request.query.Expires });
        return { err: errors.AccessDenied };
    }
    if (currentTime > expirationTime) {
        log.debug('current time exceeds expires time',
-            { expires: request.query.Expires });
+        { expires: request.query.Expires });
        return { err: errors.RequestTimeTooSkewed };
    }
    const accessKey = data.AWSAccessKeyId;
--- a/lib/auth/v4/awsURIencode.ts
+++ b/lib/auth/v4/awsURIencode.ts
@ -42,40 +42,37 @@ export default function awsURIencode(
     if (typeof input !== 'string') {
        return '';
    }
-    let encoded = "";
+
+    // precalc slash and star based on configs
    const slash = encodeSlash === undefined || encodeSlash ? '%2F' : '/';
    const star = noEncodeStar !== undefined && noEncodeStar ? '*' : '%2A';
-    for (let i = 0; i < input.length; i++) {
-        let ch = input.charAt(i);
-        if ((ch >= 'A' && ch <= 'Z') ||
-            (ch >= 'a' && ch <= 'z') ||
-            (ch >= '0' && ch <= '9') ||
-            ch === '_' || ch === '-' ||
-            ch === '~' || ch === '.') {
-            encoded = encoded.concat(ch);
-        } else if (ch === ' ') {
-            encoded = encoded.concat('%20');
-        } else if (ch === '/') {
-            encoded = encoded.concat(slash);
-        } else if (ch === '*') {
-            encoded = encoded.concat(star);
-        } else {
-            if (ch >= '\uD800' && ch <= '\uDBFF') {
-                // If this character is a high surrogate peek the next character
-                // and join it with this one if the next character is a low
-                // surrogate.
-                // Otherwise the encoded URI will contain the two surrogates as
-                // two distinct UTF-8 sequences which is not valid UTF-8.
-                if (i + 1 < input.length) {
-                    const ch2 = input.charAt(i + 1);
-                    if (ch2 >= '\uDC00' && ch2 <= '\uDFFF') {
-                        i++;
-                        ch += ch2;
-                    }
-                }
-            }
-            encoded = encoded.concat(_toHexUTF8(ch));
+    const encoded: string[] = [];
+
+    const charArray = Array.from(input);
+    for (const ch of charArray) {
+        switch (true) {
+            case ch >= 'A' && ch <= 'Z':
+            case ch >= 'a' && ch <= 'z':
+            case ch >= '0' && ch <= '9':
+            case ch === '-':
+            case ch === '_':
+            case ch === '~':
+            case ch === '.':
+                encoded.push(ch);
+                break;
+            case ch === '/':
+                encoded.push(slash);
+                break;
+            case ch === '*':
+                encoded.push(star);
+                break;
+            case ch === ' ':
+                encoded.push('%20');
+                break;
+            default:
+                encoded.push(_toHexUTF8(ch));
+                break;
        }
    }
-    return encoded;
+    return encoded.join('');
 }
--- a/lib/auth/v4/headerAuthCheck.ts
+++ b/lib/auth/v4/headerAuthCheck.ts
@ -93,14 +93,14 @@ export function check(
    }
    if (!timestamp) {
        log.debug('missing or invalid date header',
-            { method: 'auth/v4/headerAuthCheck.check' });
+          { method: 'auth/v4/headerAuthCheck.check' });
        return { err: errors.AccessDenied.
-            customizeDescription('Authentication requires a valid Date or ' +
+          customizeDescription('Authentication requires a valid Date or ' +
          'x-amz-date header') };
    }

    const validationResult = validateCredentials(credentialsArr, timestamp,
-        log);
+      log);
    if (validationResult instanceof Error) {
        log.debug('credentials in improper format', { credentialsArr,
            timestamp, validationResult });
@ -132,17 +132,6 @@ export function check(
        return { err: errors.RequestTimeTooSkewed };
    }

-    let proxyPath: string | undefined;
-    if (request.headers.proxy_path) {
-        try {
-            proxyPath = decodeURIComponent(request.headers.proxy_path);
-        } catch (err) {
-            log.debug('invalid proxy_path header', { proxyPath, err });
-            return { err: errors.InvalidArgument.customizeDescription(
-                'invalid proxy_path header') };
-        }
-    }
-
    const stringToSign = constructStringToSign({
        log,
        request,
@ -152,7 +141,6 @@ export function check(
        timestamp,
        payloadChecksum,
        awsService: service,
-        proxyPath,
    });
    log.trace('constructed stringToSign', { stringToSign });
    if (stringToSign instanceof Error) {
--- a/lib/auth/v4/queryAuthCheck.ts
+++ b/lib/auth/v4/queryAuthCheck.ts
@ -39,7 +39,7 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
    }

    const validationResult = validateCredentials(credential, timestamp,
-        log);
+      log);
    if (validationResult instanceof Error) {
        log.debug('credentials in improper format', { credential,
            timestamp, validationResult });
@ -56,17 +56,6 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        return { err: errors.RequestTimeTooSkewed };
    }

-    let proxyPath: string | undefined;
-    if (request.headers.proxy_path) {
-        try {
-            proxyPath = decodeURIComponent(request.headers.proxy_path);
-        } catch (err) {
-            log.debug('invalid proxy_path header', { proxyPath });
-            return { err: errors.InvalidArgument.customizeDescription(
-                'invalid proxy_path header') };
-        }
-    }
-
    // In query v4 auth, the canonical request needs
    // to include the query params OTHER THAN
    // the signature so create a
@ -92,7 +81,6 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        credentialScope:
            `${scopeDate}/${region}/${service}/${requestType}`,
        awsService: service,
-        proxyPath,
    });
    if (stringToSign instanceof Error) {
        return { err: stringToSign };
--- a/lib/auth/v4/streamingV4/V4Transform.ts
+++ b/lib/auth/v4/streamingV4/V4Transform.ts
@ -3,7 +3,7 @@ import async from 'async';
 import errors from '../../../errors';
 import { Logger } from 'werelogs';
 import Vault, { AuthV4RequestParams } from '../../Vault';
-import { Callback } from '../../backends/in_memory/types';
+import { Callback } from '../../in_memory/types';

 import constructChunkStringToSign from './constructChunkStringToSign';

--- a/lib/auth/v4/validateInputs.ts
+++ b/lib/auth/v4/validateInputs.ts
@ -27,20 +27,20 @@ export function validateCredentials(
        log.warn('accessKey provided is wrong format', { accessKey });
        return errors.InvalidArgument;
    }
-    // The scope date (format YYYYMMDD) must be same date as the timestamp
-    // on the request from the x-amz-date param (if queryAuthCheck)
-    // or from the x-amz-date header or date header (if headerAuthCheck)
-    // Format of timestamp is ISO 8601: YYYYMMDDTHHMMSSZ.
-    // http://docs.aws.amazon.com/AmazonS3/latest/API/
-    // sigv4-query-string-auth.html
-    // http://docs.aws.amazon.com/general/latest/gr/
-    // sigv4-date-handling.html
+     // The scope date (format YYYYMMDD) must be same date as the timestamp
+     // on the request from the x-amz-date param (if queryAuthCheck)
+     // or from the x-amz-date header or date header (if headerAuthCheck)
+     // Format of timestamp is ISO 8601: YYYYMMDDTHHMMSSZ.
+     // http://docs.aws.amazon.com/AmazonS3/latest/API/
+     // sigv4-query-string-auth.html
+     // http://docs.aws.amazon.com/general/latest/gr/
+     // sigv4-date-handling.html

-    // convert timestamp to format of scopeDate YYYYMMDD
+     // convert timestamp to format of scopeDate YYYYMMDD
    const timestampDate = timestamp.split('T')[0];
    if (scopeDate.length !== 8 || scopeDate !== timestampDate) {
        log.warn('scope date must be the same date as the timestamp date',
-            { scopeDate, timestampDate });
+           { scopeDate, timestampDate });
        return errors.RequestTimeTooSkewed;
    }
    if (service !== 's3' && service !== 'iam' && service !== 'ring' &&
@ -52,7 +52,7 @@ export function validateCredentials(
    }
    if (requestType !== 'aws4_request') {
        log.warn('requestType contained in params is not aws4_request',
-            { requestType });
+           { requestType });
        return errors.InvalidArgument;
    }
    return {};
@ -79,7 +79,7 @@ export function extractQueryParams(
    // Do not need the algorithm sent back
    if (queryObj['X-Amz-Algorithm'] !== 'AWS4-HMAC-SHA256') {
        log.warn('algorithm param incorrect',
-            { algo: queryObj['X-Amz-Algorithm'] });
+        { algo: queryObj['X-Amz-Algorithm'] });
        return authParams;
    }

--- a/lib/clustering/ClusterRPC.ts
+++ b/lib/clustering/ClusterRPC.ts
@ -1,569 +0,0 @@
-import cluster, { Worker } from 'cluster';
-import * as werelogs from 'werelogs';
-
-import { default as errors } from '../../lib/errors';
-
-const rpcLogger = new werelogs.Logger('ClusterRPC');
-
-/**
- * Remote procedure calls support between cluster workers.
- *
- * When using the cluster module, new processes are forked and are
- * dispatched workloads, usually HTTP requests. The ClusterRPC module
- * implements a RPC system to send commands to all cluster worker
- * processes at once from any particular worker, and retrieve their
- * individual command results, like a distributed map operation.
- *
- * The existing nodejs cluster IPC channel is setup from the primary
- * to each worker, but not between workers, so there has to be a hop
- * by the primary.
- *
- * How a command is treated:
- *
- * - a worker sends a command message to the primary
- *
- * - the primary then forwards that command to each existing worker
- *   (including the requestor)
- *
- * - each worker then executes the command and returns a result or an
- *   error
- *
- * - the primary gathers all workers results into an array
- *
- * - finally, the primary dispatches the results array to the original
- *   requesting worker
- *
- *
- * Limitations:
- *
- * - The command payload must be serializable, which means that:
- *   - it should not contain circular references
- *   - it should be of a reasonable size to be sent in a single RPC message
- *
- * - The "toWorkers" parameter of value "*" targets the set of workers
- *   that are available at the time the command is dispatched. Any new
- *   worker spawned after the command has been dispatched for
- *   processing, but before the command completes, don't execute
- *   the command and hence are not part of the results array.
- *
- *
- * To set it up:
- *
- * - On the primary:
- *     if (cluster.isPrimary) {
- *         setupRPCPrimary();
- *     }
- *
- * - On the workers:
- *     if (!cluster.isPrimary) {
- *         setupRPCWorker({
- *             handler1: (payload: object, uids: string, callback: HandlerCallback) => void,
- *             handler2: ...
- *         });
- *     }
- *     Handler functions will be passed the command payload, request
- *     serialized uids, and must call the callback when the worker is done
- *     processing the command:
- *         callback(error: Error | null | undefined, result?: any)
- *
- * When this setup is done, any worker can start sending commands by calling
- * the async function sendWorkerCommand().
- */
-
-// exported types
-
-export type ResultObject = {
-    error: Error | null;
-    result: any;
-};
-
-/**
- * saved Promise for sendWorkerCommand
- */
-export type CommandPromise = {
-    resolve: (results?: ResultObject[]) => void;
-    reject: (error: Error) => void;
-    timeout: NodeJS.Timeout | null;
-};
-export type HandlerCallback = (error: (Error & { code?: number }) | null | undefined, result?: any) => void;
-export type HandlerFunction = (payload: object, uids: string, callback: HandlerCallback) => void;
-export type HandlersMap = {
-    [index: string]: HandlerFunction;
-};
-export type PrimaryHandlerFunction = (worker: Worker, payload: object, uids: string, callback: HandlerCallback) => void;
-export type PrimaryHandlersMap = Record<string, PrimaryHandlerFunction>;
-
-// private types
-
-type RPCMessage<T extends string, P> = {
-    type: T;
-    uids: string;
-    payload: P;
-};
-
-type RPCCommandMessage = RPCMessage<'cluster-rpc:command', any> & {
-    toWorkers: string;
-    toHandler: string;
-};
-
-type MarshalledResultObject = {
-    error: string | null;
-    errorCode?: number;
-    result: any;
-};
-
-type RPCCommandResultMessage = RPCMessage<'cluster-rpc:commandResult', MarshalledResultObject>;
-
-type RPCCommandResultsMessage = RPCMessage<'cluster-rpc:commandResults', {
-    results: MarshalledResultObject[];
-}>;
-
-type RPCCommandErrorMessage = RPCMessage<'cluster-rpc:commandError', {
-    error: string;
-}>;
-
-interface RPCSetupOptions {
-    /**
-     * As werelogs is not a peerDependency, arsenal and a parent project
-     * might have their own separate versions duplicated in dependencies.
-     * The config are therefore not shared.
-     * Use this to propagate werelogs config to arsenal's ClusterRPC.
-     */
-    werelogsConfig?: Parameters<typeof werelogs.configure>[0];
-};
-
-/**
- * In primary: store worker IDs that are waiting to be dispatched
- * their command's results, as a mapping.
- */
-const uidsToWorkerId: {
-    [index: string]: number;
-} = {};
-
-
-/**
- * In primary: store worker responses for commands in progress as a
- * mapping.
- *
- * Result objects are 'null' while the worker is still processing the
- * command. When a worker finishes processing it stores the result as:
- *    {
- *        error: string | null,
- *        result: any
- *    }
- */
-const uidsToCommandResults: {
-    [index: string]: {
-        [index: number]: MarshalledResultObject | null;
-    };
-} = {};
-
-/**
- * In workers: store promise callbacks for commands waiting to be
- * dispatched, as a mapping.
- */
-const uidsToCommandPromise: {
-    [index: string]: CommandPromise;
-} = {};
-
-
-function _isRpcMessage(message) {
-    return (message !== null &&
-            typeof message === 'object' &&
-            typeof message.type === 'string' &&
-            message.type.startsWith('cluster-rpc:'));
-}
-
-/**
- * Setup cluster RPC system on the primary
- *
- * @param {object} [handlers] - mapping of handler names to handler functions
- *     handler function:
- *         `handler({Worker} worker, {object} payload, {string} uids, {function} callback)`
- *     handler callback must be called when worker is done with the command:
- *         `callback({Error|null} error, {any} [result])`
- * @return {undefined}
- */
-export function setupRPCPrimary(handlers?: PrimaryHandlersMap, options?: RPCSetupOptions) {
-    if (options?.werelogsConfig) {
-        werelogs.configure(options.werelogsConfig);
-    }
-    cluster.on('message', (worker, message) => {
-        if (_isRpcMessage(message)) {
-            _handlePrimaryMessage(worker, message, handlers);
-        }
-    });
-}
-
-/**
- * Setup RPCs on a cluster worker process
- *
- * @param {object} handlers - mapping of handler names to handler functions
- *     handler function:
- *         handler({object} payload, {string} uids, {function} callback)
- *     handler callback must be called when worker is done with the command:
- *         callback({Error|null} error, {any} [result])
- * @return {undefined}
- * }
- */
-export function setupRPCWorker(handlers: HandlersMap, options?: RPCSetupOptions) {
-    if (!process.send) {
-        throw new Error('fatal: cannot setup cluster RPC: "process.send" is not available');
-    }
-    if (options?.werelogsConfig) {
-        werelogs.configure(options.werelogsConfig);
-    }
-    process.on('message', (message: RPCCommandMessage | RPCCommandResultsMessage) => {
-        if (_isRpcMessage(message)) {
-            _handleWorkerMessage(message, handlers);
-        }
-    });
-}
-
-/**
- * Send a command for workers to execute in parallel, and wait for results
- *
- * @param {string} toWorkers - which workers should execute the command
- *     Currently the supported values are:
- *         - "*", meaning all workers will execute the command
- *         - "PRIMARY", meaning primary process will execute the command
- * @param {string} toHandler - name of handler that will execute the
- * command in workers, as declared in setupRPCWorker() parameter object
- * @param {string} uids - unique identifier of the command, must be
- * unique across all commands in progress
- * @param {object} payload - message payload, sent as-is to the handler
- * @param {number} [timeoutMs=60000] - timeout the command with a
- * "RequestTimeout" error after this number of milliseconds - set to 0
- * to disable timeouts (the command may then hang forever)
- * @returns {Promise}
- */
-export async function sendWorkerCommand(
-    toWorkers: string,
-    toHandler: string,
-    uids: string,
-    payload: object,
-    timeoutMs: number = 60000
-) {
-    if (typeof uids !== 'string') {
-        rpcLogger.error('missing or invalid "uids" field', { uids });
-        throw errors.MissingParameter;
-    }
-    if (uidsToCommandPromise[uids] !== undefined) {
-        rpcLogger.error('a command is already in progress with same uids', { uids });
-        throw errors.OperationAborted;
-    }
-    rpcLogger.info('sending command', { toWorkers, toHandler, uids, payload });
-    return new Promise((resolve, reject) => {
-        let timeout: NodeJS.Timeout | null = null;
-        if (timeoutMs) {
-            timeout = setTimeout(() => {
-                delete uidsToCommandPromise[uids];
-                reject(errors.RequestTimeout);
-            }, timeoutMs);
-        }
-        uidsToCommandPromise[uids] = { resolve, reject, timeout };
-        const message: RPCCommandMessage = {
-            type: 'cluster-rpc:command',
-            toWorkers,
-            toHandler,
-            uids,
-            payload,
-        };
-        return process.send?.(message);
-    });
-}
-
-/**
- * Get the number of commands in flight
- * @returns {number}
- */
-export function getPendingCommandsCount() {
-    return Object.keys(uidsToCommandPromise).length;
-}
-
-
-function _dispatchCommandResultsToWorker(
-    worker: Worker,
-    uids: string,
-    resultsArray: MarshalledResultObject[]
-): void {
-    const message: RPCCommandResultsMessage = {
-        type: 'cluster-rpc:commandResults',
-        uids,
-        payload: {
-            results: resultsArray,
-        },
-    };
-    worker.send(message);
-}
-
-function _dispatchCommandErrorToWorker(
-    worker: Worker,
-    uids: string,
-    error: Error,
-): void {
-    const message: RPCCommandErrorMessage = {
-        type: 'cluster-rpc:commandError',
-        uids,
-        payload: {
-            error: error.message,
-        },
-    };
-    worker.send(message);
-}
-
-function _sendPrimaryCommandResult(
-    worker: Worker,
-    uids: string,
-    error: (Error & { code?: number }) | null | undefined,
-    result?: any
-): void {
-    const message: RPCCommandResultsMessage = {
-        type: 'cluster-rpc:commandResults',
-        uids,
-        payload: {
-            results: [{ error: error?.message || null, errorCode: error?.code, result }],
-        },
-    };
-    worker.send?.(message);
-}
-
-function _handlePrimaryCommandMessage(
-    fromWorker: Worker,
-    logger: any,
-    message: RPCCommandMessage,
-    handlers?: PrimaryHandlersMap
-): void {
-    const { toWorkers, toHandler, uids, payload } = message;
-    if (toWorkers === '*') {
-        if (uidsToWorkerId[uids] !== undefined) {
-            logger.warn('new command already has a waiting worker with same uids', {
-                uids, workerId: uidsToWorkerId[uids],
-            });
-            return undefined;
-        }
-        const commandResults = {};
-        for (const workerId of Object.keys(cluster.workers || {})) {
-            commandResults[workerId] = null;
-        }
-        uidsToWorkerId[uids] = fromWorker?.id;
-        uidsToCommandResults[uids] = commandResults;
-
-        for (const [workerId, worker] of Object.entries(cluster.workers || {})) {
-            logger.debug('sending command message to worker', {
-                workerId, toHandler, payload,
-            });
-            if (worker) {
-                worker.send(message);
-            }
-        }
-    } else if (toWorkers === 'PRIMARY') {
-        const { toHandler, uids, payload } = message;
-        const cb: HandlerCallback = (err, result) => _sendPrimaryCommandResult(fromWorker, uids, err, result);
-
-        if (toHandler in (handlers || {})) {
-            return handlers![toHandler](fromWorker, payload, uids, cb);
-        }
-        logger.error('no such handler in "toHandler" field from worker command message', {
-            toHandler,
-        });
-        return cb(errors.NotImplemented);
-    } else {
-        logger.error('unsupported "toWorkers" field from worker command message', {
-            toWorkers,
-        });
-        if (fromWorker) {
-            _dispatchCommandErrorToWorker(fromWorker, uids, errors.NotImplemented);
-        }
-    }
-}
-
-function _handlePrimaryCommandResultMessage(
-    fromWorkerId: number,
-    logger: any,
-    message: RPCCommandResultMessage
-): void {
-    const { uids, payload } = message;
-    const commandResults = uidsToCommandResults[uids];
-    if (!commandResults) {
-        logger.warn('received command response message from worker for command not in flight', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    if (commandResults[fromWorkerId] === undefined) {
-        logger.warn('received command response message with unexpected worker ID', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    if (commandResults[fromWorkerId] !== null) {
-        logger.warn('ignoring duplicate command response from worker', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    commandResults[fromWorkerId] = payload;
-    const commandResultsArray = Object.values(commandResults);
-    if (commandResultsArray.every(response => response !== null)) {
-        logger.debug('all workers responded to command', { uids });
-        const completeCommandResultsArray = <MarshalledResultObject[]> commandResultsArray;
-        const toWorkerId = uidsToWorkerId[uids];
-        const toWorker = cluster.workers?.[toWorkerId];
-
-        delete uidsToCommandResults[uids];
-        delete uidsToWorkerId[uids];
-
-        if (!toWorker) {
-            logger.warn('worker shut down while its command was executing', {
-                workerId: toWorkerId, uids,
-            });
-            return undefined;
-        }
-        // send back response to original worker
-        _dispatchCommandResultsToWorker(toWorker, uids, completeCommandResultsArray);
-    }
-}
-
-function _handlePrimaryMessage(
-    fromWorker: Worker,
-    message: RPCCommandMessage | RPCCommandResultMessage,
-    handlers?: PrimaryHandlersMap
-): void {
-    const { type: messageType, uids } = message;
-    const logger = rpcLogger.newRequestLoggerFromSerializedUids(uids);
-    logger.debug('primary received message from worker', {
-        workerId: fromWorker?.id, rpcMessage: message,
-    });
-    if (messageType === 'cluster-rpc:command') {
-        return _handlePrimaryCommandMessage(fromWorker, logger, message, handlers);
-    }
-    if (messageType === 'cluster-rpc:commandResult') {
-        return _handlePrimaryCommandResultMessage(fromWorker?.id, logger, message);
-    }
-    logger.error('unsupported message type', {
-        workerId: fromWorker?.id, messageType, uids,
-    });
-    return undefined;
-}
-
-function _sendWorkerCommandResult(
-    uids: string,
-    error: Error | null | undefined,
-    result?: any
-): void {
-    const message: RPCCommandResultMessage = {
-        type: 'cluster-rpc:commandResult',
-        uids,
-        payload: {
-            error: error ? error.message : null,
-            result,
-        },
-    };
-    process.send?.(message);
-}
-
-function _handleWorkerCommandMessage(
-    logger: any,
-    message: RPCCommandMessage,
-    handlers: HandlersMap
-): void {
-    const { toHandler, uids, payload } = message;
-    const cb: HandlerCallback = (err, result) => _sendWorkerCommandResult(uids, err, result);
-
-    if (toHandler in handlers) {
-        return handlers[toHandler](payload, uids, cb);
-    }
-    logger.error('no such handler in "toHandler" field from worker command message', {
-        toHandler,
-    });
-    return cb(errors.NotImplemented);
-}
-
-function _handleWorkerCommandResultsMessage(
-    logger: any,
-    message: RPCCommandResultsMessage,
-): void {
-    const { uids, payload } = message;
-    const { results } = payload;
-    const commandPromise: CommandPromise = uidsToCommandPromise[uids];
-    if (commandPromise === undefined) {
-        logger.error('missing promise for command results', { uids, payload });
-        return undefined;
-    }
-    if (commandPromise.timeout) {
-        clearTimeout(commandPromise.timeout);
-    }
-    delete uidsToCommandPromise[uids];
-    const unmarshalledResults = results.map(workerResult => {
-        let workerError: Error | null = null;
-        if (workerResult.error) {
-            if (workerResult.error in errors) {
-                workerError = errors[workerResult.error];
-            } else {
-                workerError = new Error(workerResult.error);
-            }
-        }
-        if (workerError && workerResult.errorCode) {
-            (workerError as Error & { code: number }).code = workerResult.errorCode;
-        }
-        const unmarshalledResult: ResultObject = {
-            error: workerError,
-            result: workerResult.result,
-        };
-        return unmarshalledResult;
-    });
-    return commandPromise.resolve(unmarshalledResults);
-}
-
-function _handleWorkerCommandErrorMessage(
-    logger: any,
-    message: RPCCommandErrorMessage,
-): void {
-    const { uids, payload } = message;
-    const { error } = payload;
-    const commandPromise: CommandPromise = uidsToCommandPromise[uids];
-    if (commandPromise === undefined) {
-        logger.error('missing promise for command results', { uids, payload });
-        return undefined;
-    }
-    if (commandPromise.timeout) {
-        clearTimeout(commandPromise.timeout);
-    }
-    delete uidsToCommandPromise[uids];
-    let commandError: Error | null = null;
-    if (error in errors) {
-        commandError = errors[error];
-    } else {
-        commandError = new Error(error);
-    }
-    return commandPromise.reject(<Error> commandError);
-}
-
-function _handleWorkerMessage(
-    message: RPCCommandMessage | RPCCommandResultsMessage | RPCCommandErrorMessage,
-    handlers: HandlersMap
-): void {
-    const { type: messageType, uids } = message;
-    const workerId = cluster.worker?.id;
-    const logger = rpcLogger.newRequestLoggerFromSerializedUids(uids);
-    logger.debug('worker received message from primary', {
-        workerId, rpcMessage: message,
-    });
-    if (messageType === 'cluster-rpc:command') {
-        return _handleWorkerCommandMessage(logger, message, handlers);
-    }
-    if (messageType === 'cluster-rpc:commandResults') {
-        return _handleWorkerCommandResultsMessage(logger, message);
-    }
-    if (messageType === 'cluster-rpc:commandError') {
-        return _handleWorkerCommandErrorMessage(logger, message);
-    }
-    logger.error('unsupported message type', {
-        workerId, messageType,
-    });
-    return undefined;
-}
--- a/lib/constants.ts
+++ b/lib/constants.ts
@ -2,18 +2,18 @@ import * as crypto from 'crypto';

 // The min value here is to manage further backward compat if we
 // need it
-// Default value
-export const vaultGeneratedIamSecurityTokenSizeMin = 128;
-// Safe to assume that a typical token size is less than 8192 bytes
-export const vaultGeneratedIamSecurityTokenSizeMax = 8192;
-// Base-64
-export const vaultGeneratedIamSecurityTokenPattern = /^[A-Za-z0-9/+=]*$/;
+const iamSecurityTokenSizeMin = 128;
+const iamSecurityTokenSizeMax = 128;
+// Security token is an hex string (no real format from amazon)
+const iamSecurityTokenPattern = new RegExp(
+    `^[a-f0-9]{${iamSecurityTokenSizeMin},${iamSecurityTokenSizeMax}}$`,
+);

 // info about the iam security token
 export const iamSecurityToken = {
-    min: vaultGeneratedIamSecurityTokenSizeMin,
-    max: vaultGeneratedIamSecurityTokenSizeMax,
-    pattern: vaultGeneratedIamSecurityTokenPattern,
+    min: iamSecurityTokenSizeMin,
+    max: iamSecurityTokenSizeMax,
+    pattern: iamSecurityTokenPattern,
 };
 // PublicId is used as the canonicalID for a request that contains
 // no authentication information.  Requestor can access
@ -22,7 +22,6 @@ export const publicId = 'http://acs.amazonaws.com/groups/global/AllUsers';
 export const zenkoServiceAccount = 'http://acs.zenko.io/accounts/service';
 export const metadataFileNamespace = '/MDFile';
 export const dataFileURL = '/DataFile';
-export const passthroughFileURL = '/PassthroughFile';
 // AWS states max size for user-defined metadata
 // (x-amz-meta- headers) is 2 KB:
 // http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html
@ -32,16 +31,7 @@ export const maximumMetaHeadersSize = 2136;
 export const emptyFileMd5 = 'd41d8cd98f00b204e9800998ecf8427e';
 // Version 2 changes the format of the data location property
 // Version 3 adds the dataStoreName attribute
-// Version 4 add the Creation-Time and Content-Language attributes,
-//     and add support for x-ms-meta-* headers in UserMetadata
-// Version 5 adds the azureInfo structure
-// Version 6 adds a "deleted" flag that is updated to true before
-// the object gets deleted. This is done to keep object metadata in the
-// oplog when deleting the object, as oplog deletion events don't contain
-// any metadata of the object.
-// version 6 also adds the "isPHD" flag that is used to indicate that the master
-// object is a placeholder and is not up to date.
-export const mdModelVersion = 6;
+export const mdModelVersion = 3;
 /*
 * Splitter is used to build the object name for the overview of a
 * multipart upload and to build the object names for each part of a
@ -81,45 +71,19 @@ export const mpuBucketPrefix = 'mpuShadowBucket';
 export const permittedCapitalizedBuckets = {
    METADATA: true,
 };
-// Setting a lower object key limit to account for:
-// - Mongo key limit of 1012 bytes
-// - Version ID in Mongo Key if versioned of 33
-// - Max bucket name length if bucket match false of 63
-// - Extra prefix slash for bucket prefix if bucket match of 1
-export const objectKeyByteLimit = 915;
-/* delimiter for location-constraint. The location constraint will be able
- * to include the ingestion flag
- */
-export const zenkoSeparator = ':';
 /* eslint-disable camelcase */
-export const externalBackends = { aws_s3: true, azure: true, gcp: true, pfs: true };
-export const replicationBackends = { aws_s3: true, azure: true, gcp: true };
-// hex digest of sha256 hash of empty string:
-export const emptyStringHash = crypto.createHash('sha256')
-    .update('', 'binary').digest('hex');
-export const mpuMDStoredExternallyBackend = { aws_s3: true, gcp: true };
+export const externalBackends = { aws_s3: true, azure: true, gcp: true, pfs: true }
+export const hasCopyPartBackends = { aws_s3: true, gcp: true }
+export const versioningNotImplBackends = { azure: true, gcp: true }
+export const mpuMDStoredExternallyBackend = { aws_s3: true, gcp: true }
 // AWS sets a minimum size limit for parts except for the last part.
 // http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadComplete.html
 export const minimumAllowedPartSize = 5242880;
-export const gcpMaximumAllowedPartCount = 1024;
-// GCP Object Tagging Prefix
-export const gcpTaggingPrefix = 'aws-tag-';
-export const productName = 'APN/1.0 Scality/1.0 Scality CloudServer for Zenko';
-export const legacyLocations = ['sproxyd', 'legacy'];
-// healthcheck default call from nginx is every 2 seconds
-// for external backends, don't call unless at least 1 minute
-// (60,000 milliseconds) since last call
-export const externalBackendHealthCheckInterval = 60000;
-// some of the available data backends  (if called directly rather
-// than through the multiple backend gateway) need a key provided
-// as a string as first parameter of the get/delete methods.
-export const clientsRequireStringKey = { sproxyd: true, cdmi: true };
-export const hasCopyPartBackends = { aws_s3: true, gcp: true };
-export const versioningNotImplBackends = { azure: true, gcp: true };
-// user metadata applied on zenko-created objects
-export const zenkoIDHeader = 'x-amz-meta-zenko-instance-id';
+// hex digest of sha256 hash of empty string:
+export const emptyStringHash = crypto.createHash('sha256').update('', 'binary').digest('hex');
 // Default expiration value of the S3 pre-signed URL duration
 // 604800 seconds (seven days).
+export const legacyLocations = ['sproxyd', 'legacy'];
 export const defaultPreSignedURLExpiry = 7 * 24 * 60 * 60;
 // Regex for ISO-8601 formatted date
 export const shortIso8601Regex = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z/;
@ -132,21 +96,16 @@ export const supportedNotificationEvents = new Set([
    's3:ObjectRemoved:*',
    's3:ObjectRemoved:Delete',
    's3:ObjectRemoved:DeleteMarkerCreated',
-    's3:Replication:OperationFailedReplication',
    's3:ObjectTagging:*',
    's3:ObjectTagging:Put',
    's3:ObjectTagging:Delete',
    's3:ObjectAcl:Put',
-    's3:ObjectRestore:*',
-    's3:ObjectRestore:Post',
-    's3:ObjectRestore:Completed',
-    's3:ObjectRestore:Delete',
-    's3:LifecycleTransition',
-    's3:LifecycleExpiration:*',
-    's3:LifecycleExpiration:DeleteMarkerCreated',
-    's3:LifecycleExpiration:Delete',
 ]);
 export const notificationArnPrefix = 'arn:scality:bucketnotif';
+// some of the available data backends  (if called directly rather
+// than through the multiple backend gateway) need a key provided
+// as a string as first parameter of the get/delete methods.
+export const clientsRequireStringKey = { sproxyd: true, cdmi: true };
 // HTTP server keep-alive timeout is set to a higher value than
 // client's free sockets timeout to avoid the risk of triggering
 // ECONNRESET errors if the server closes the connection at the
@ -163,15 +122,7 @@ export const supportedLifecycleRules = [
    'expiration',
    'noncurrentVersionExpiration',
    'abortIncompleteMultipartUpload',
-    'transitions',
-    'noncurrentVersionTransition',
 ];
 // Maximum number of buckets to cache (bucket metadata)
 export const maxCachedBuckets = process.env.METADATA_MAX_CACHED_BUCKETS ?
    Number(process.env.METADATA_MAX_CACHED_BUCKETS) : 1000;
-
-export const validRestoreObjectTiers = new Set(['Expedited', 'Standard', 'Bulk']);
-export const maxBatchingConcurrentOperations = 5;
-
-/** For policy resource arn check we allow empty account ID to not break compatibility */
-export const policyArnAllowedEmptyAccountId = ['utapi', 'scuba'];
--- a/lib/db.ts
+++ b/lib/db.ts
@ -148,7 +148,7 @@ export class IndexTransaction {
                'missing condition for conditional put'
            );
        }
-        if (typeof condition.notExists !== 'string' && typeof condition.exists !== 'string') {
+        if (typeof condition.notExists !== 'string') {
            throw propError(
                'unsupportedConditionalOperation',
                'missing key or supported condition'
--- a/lib/errors/arsenalErrors.ts
+++ b/lib/errors/arsenalErrors.ts
@ -690,11 +690,6 @@ export const ReportNotPresent: ErrorFormat = {
        'The request was rejected because the credential report does not exist. To generate a credential report, use GenerateCredentialReport.',
 };

-export const Found: ErrorFormat = {
-    code: 302,
-    description: 'Resource Found'
-};
-
 // ------------- Special non-AWS S3 errors -------------

 export const MPUinProgress: ErrorFormat = {
@ -1042,15 +1037,3 @@ export const AuthMethodNotImplemented: ErrorFormat = {
    description: 'AuthMethodNotImplemented',
    code: 501,
 };
-
-// --------------------- quotaErros ---------------------
-
-export const NoSuchQuota: ErrorFormat = {
-    code: 404,
-    description: 'The specified resource does not have a quota.',
-};
-
-export const QuotaExceeded: ErrorFormat = {
-    code: 429,
-    description: 'The quota set for the resource is exceeded.',
-};
--- a/lib/errors/index.ts
+++ b/lib/errors/index.ts
@ -2,7 +2,7 @@ import type { ServerResponse } from 'http';
 import * as rawErrors from './arsenalErrors';

 /** All possible errors names. */
-export type Name = keyof typeof rawErrors;
+export type Name = keyof typeof rawErrors
 /** Object containing all errors names. It has the format { [Name]: "Name" } */
 export type Names = { [Name_ in Name]: Name_ };
 /** Mapping used to determine an error type. It has the format { [Name]: boolean } */
@ -13,7 +13,7 @@ export type Errors = { [_ in Name]: ArsenalError };
 // This object is reused constantly through createIs, we store it there
 // to avoid recomputation.
 const isBase = Object.fromEntries(
-    Object.keys(rawErrors).map((key) => [key, false])
+    Object.keys(rawErrors).map(key => [key, false])
 ) as Is;

 // This allows to conditionally add the old behavior of errors to properly
@ -32,7 +32,7 @@ export const allowUnsafeErrComp = (
 // the Proxy will return false.
 const createIs = (type: Name): Is => {
    const get = (is: Is, value: string | symbol) => is[value] ?? false;
-    const final = Object.freeze({ ...isBase, [type]: true });
+    const final = Object.freeze({ ...isBase, [type]: true })
    return new Proxy(final, { get });
 };

@ -46,18 +46,13 @@ export class ArsenalError extends Error {
    /** Object used to determine the error type.
     * Example: error.is.InternalError */
    #is: Is;
-    /** A map of error metadata (can be extra fields
-     * that only show in debug mode) */
-    #metadata: Map<string, Object[]>;

-    private constructor(type: Name, code: number, description: string,
-        metadata?: Map<string, Object[]>) {
+    private constructor(type: Name, code: number, description: string) {
        super(type);
        this.#code = code;
        this.#description = description;
        this.#type = type;
        this.#is = createIs(type);
-        this.#metadata = metadata ?? new Map<string, Object[]>();

        // This restores the old behavior of errors, to make sure they're now
        // backward-compatible. Fortunately it's handled by TS, but it cannot
@ -111,22 +106,7 @@ export class ArsenalError extends Error {
    customizeDescription(description: string): ArsenalError {
        const type = this.#type;
        const code = this.#code;
-        const metadata = new Map(this.#metadata);
-        const err = new ArsenalError(type, code, description, metadata);
-        err.stack = this.stack;
-        return err;
-    }
-
-    /** Clone the error with a new metadata field */
-    addMetadataEntry(key: string, value: Object[]): ArsenalError {
-        const type = this.#type;
-        const code = this.#code;
-        const description = this.#description;
-        const metadata = new Map(this.#metadata);
-        metadata.set(key, value);
-        const err = new ArsenalError(type, code, description, metadata);
-        err.stack = this.stack;
-        return err;
+        return new ArsenalError(type, code, description);
    }

    /** Used to determine the error type. Example: error.is.InternalError */
@ -151,14 +131,9 @@ export class ArsenalError extends Error {
        return this.#type;
    }

-    /** A map of error metadata */
-    get metadata() {
-        return this.#metadata;
-    }
-
    /** Generate all possible errors. An instance is created by default. */
    static errors() {
-        const errors = {};
+        const errors = {}
        Object.entries(rawErrors).forEach((value) => {
            const name = value[0] as Name;
            const error = value[1];
@ -166,7 +141,7 @@ export class ArsenalError extends Error {
            const get = () => new ArsenalError(name, code, description);
            Object.defineProperty(errors, name, { get });
        });
-        return errors as Errors;
+        return errors as Errors
    }
 }

--- a/lib/executables/pensieveCreds/package.json
+++ b/lib/executables/pensieveCreds/package.json
@ -7,8 +7,8 @@
    "test": "mocha --recursive --timeout 5500 tests/unit"
  },
  "dependencies": {
-    "mocha": "5.2.0",
-    "async": "~2.6.1",
+    "mocha": "2.5.3",
+    "async": "^2.6.0",
    "node-forge": "^0.7.1"
  }
 }
--- a/lib/metrics/RedisClient.ts
+++ b/lib/metrics/RedisClient.ts
@ -20,32 +20,7 @@ export default class RedisClient {
        return this;
    }

-    /**
-    * scan a pattern and return matching keys
-    * @param pattern - string pattern to match with all existing keys
-    * @param [count=10] - scan count
-    * @param cb - callback (error, result)
-    */
-    scan(pattern: string, count = 10, cb: Callback) {
-        const params = { match: pattern, count };
-        const keys: any[] = [];
-
-        const stream = this._client.scanStream(params);
-        stream.on('data', resultKeys => {
-            for (let i = 0; i < resultKeys.length; i++) {
-                keys.push(resultKeys[i]);
-            }
-        });
-        stream.on('end', () => {
-            cb(null, keys);
-        });
-    }
-
-    /** increment value of a key by 1 and set a ttl
-     * @param key - key holding the value
-     * @param expiry - expiry in seconds
-     * @param cb - callback
-     */
+    /** increment value of a key by 1 and set a ttl */
    incrEx(key: string, expiry: number, cb: Callback) {
        const exp = expiry.toString();
        return this._client
@ -53,22 +28,7 @@ export default class RedisClient {
            .exec(cb);
    }

-    /**
-     * increment value of a key by a given amount
-     * @param key - key holding the value
-     * @param amount - amount to increase by
-     * @param cb - callback
-     */
-    incrby(key: string, amount: number, cb: Callback) {
-        return this._client.incrby(key, amount, cb);
-    }
-
-    /** increment value of a key by a given amount and set a ttl
-     * @param key - key holding the value
-     * @param amount - amount to increase by
-     * @param expiry - expiry in seconds
-     * @param cb - callback
-     */
+    /** increment value of a key by a given amount and set a ttl */
    incrbyEx(key: string, amount: number, expiry: number, cb: Callback) {
        const am = amount.toString();
        const exp = expiry.toString();
@ -77,29 +37,13 @@ export default class RedisClient {
            .exec(cb);
    }

-    /**
-     * decrement value of a key by a given amount
-     * @param key - key holding the value
-     * @param amount - amount to increase by
-     * @param cb - callback
-     */
-    decrby(key: string, amount: number, cb: Callback) {
-        return this._client.decrby(key, amount, cb);
-    }
-
-    /**
-    * execute a batch of commands
-    * @param cmds - list of commands
-    * @param cb - callback
-    * @return
-    */
+    /** execute a batch of commands */
    batch(cmds: string[][], cb: Callback) {
        return this._client.pipeline(cmds).exec(cb);
    }

    /**
     * Checks if a key exists
-     * @param key - name of key
     * @param cb - callback
     *   If cb response returns 0, key does not exist.
     *   If cb response returns 1, key exists.
@ -108,22 +52,10 @@ export default class RedisClient {
        return this._client.exists(key, cb);
    }

-    /**
-     * get value stored at key
-     * @param key - key holding the value
-     * @param cb - callback
-     */
-    get(key: string, cb: Callback) {
-        return this._client.get(key, cb);
-    }
-
    /**
     * Add a value and its score to a sorted set. If no sorted set exists, this
     * will create a new one for the given key.
-     * @param key - name of key
     * @param score - score used to order set
-     * @param value - value to store
-     * @param cb - callback
     */
    zadd(key: string, score: number, value: string, cb: Callback) {
        return this._client.zadd(key, score, value, cb);
@ -134,8 +66,6 @@ export default class RedisClient {
     * Note: using this on a key that does not exist will return 0.
     * Note: using this on an existing key that isn't a sorted set will
     * return an error WRONGTYPE.
-     * @param key - name of key
-     * @param cb - callback
     */
    zcard(key: string, cb: Callback) {
        return this._client.zcard(key, cb);
@ -146,9 +76,6 @@ export default class RedisClient {
     * Note: using this on a key that does not exist will return nil.
     * Note: using this on a value that does not exist in a valid sorted set key
     *       will return nil.
-     * @param key - name of key
-     * @param value - value within sorted set
-     * @param cb - callback
     */
     zscore(key: string, value: string, cb: Callback) {
        return this._client.zscore(key, value, cb);
@ -156,10 +83,8 @@ export default class RedisClient {

    /**
     * Remove a value from a sorted set
-     * @param key - name of key
-     * @param value - value within sorted set. Can specify
-     *   multiple values within an array
-     * @param cb - callback
+     * @param value - value within sorted set. Can specify multiple values within an array
+     * @param {function} cb - callback
     *   The cb response returns number of values removed
     */
    zrem(key: string, value: string | string[], cb: Callback) {
@ -168,10 +93,8 @@ export default class RedisClient {

    /**
     * Get specified range of elements in a sorted set
-     * @param key - name of key
     * @param start - start index (inclusive)
     * @param end - end index (inclusive) (can use -1)
-     * @param cb - callback
     */
    zrange(key: string, start: number, end: number, cb: Callback) {
        return this._client.zrange(key, start, end, cb);
@ -179,12 +102,10 @@ export default class RedisClient {

    /**
     * Get range of elements in a sorted set based off score
-     * @param key - name of key
     * @param min - min score value (inclusive)
     *   (can use "-inf")
     * @param max - max score value (inclusive)
     *   (can use "+inf")
-     * @param cb - callback
     */
    zrangebyscore(
        key: string,
@ -195,15 +116,6 @@ export default class RedisClient {
        return this._client.zrangebyscore(key, min, max, cb);
    }

-    /**
-     * get TTL or expiration in seconds
-     * @param key - name of key
-     * @param cb - callback
-     */
-    ttl(key: string, cb: Callback) {
-        return this._client.ttl(key, cb);
-    }
-
    clear(cb: Callback) {
        return this._client.flushdb(cb);
    }
@ -211,8 +123,4 @@ export default class RedisClient {
    disconnect() {
        this._client.disconnect();
    }
-
-    listClients(cb: Callback) {
-        return this._client.client('list', cb);
-    }
 }
--- a/lib/metrics/StatsClient.ts
+++ b/lib/metrics/StatsClient.ts
@ -2,8 +2,6 @@ import async from 'async';
 import RedisClient from './RedisClient';
 import { Logger } from 'werelogs';

-export type Callback = (error: Error | null, value?: any) => void;
-
 export default class StatsClient {
    _redis: RedisClient;
    _interval: number;
@ -50,7 +48,7 @@ export default class StatsClient {
    * @param d - Date instance
    * @return key - key for redis
    */
-    buildKey(name: string, d: Date): string {
+    _buildKey(name: string, d: Date): string {
        return `${name}:${this._normalizeTimestamp(d)}`;
    }

@ -93,33 +91,11 @@ export default class StatsClient {
            amount = (typeof incr === 'number') ? incr : 1;
        }

-        const key = this.buildKey(`${id}:requests`, new Date());
+        const key = this._buildKey(`${id}:requests`, new Date());

        return this._redis.incrbyEx(key, amount, this._expiry, callback);
    }

-    /**
-     * Increment the given key by the given value.
-     * @param key - The Redis key to increment
-     * @param incr - The value to increment by
-     * @param [cb] - callback
-     */
-    incrementKey(key: string, incr: number, cb: Callback) {
-        const callback = cb || this._noop;
-        return this._redis.incrby(key, incr, callback);
-    }
-
-    /**
-     * Decrement the given key by the given value.
-     * @param key - The Redis key to decrement
-     * @param decr - The value to decrement by
-     * @param [cb] - callback
-     */
-    decrementKey(key: string, decr: number, cb: Callback) {
-        const callback = cb || this._noop;
-        return this._redis.decrby(key, decr, callback);
-    }
-
    /**
    * report/record a request that ended up being a 500 on the server
    * @param id - service identifier
@ -129,53 +105,10 @@ export default class StatsClient {
            return undefined;
        }
        const callback = cb || this._noop;
-        const key = this.buildKey(`${id}:500s`, new Date());
+        const key = this._buildKey(`${id}:500s`, new Date());
        return this._redis.incrEx(key, this._expiry, callback);
    }

-    /**
-    * wrapper on `getStats` that handles a list of keys
-    * @param log - Werelogs request logger
-    * @param ids - service identifiers
-    * @param cb - callback to call with the err/result
-    */
-    getAllStats(log: Logger, ids: string[], cb: Callback) {
-        if (!this._redis) {
-            return cb(null, {});
-        }
-
-        const statsRes = {
-            'requests': 0,
-            '500s': 0,
-            'sampleDuration': this._expiry,
-        };
-        let requests = 0;
-        let errors = 0;
-
-        // for now set concurrency to default of 10
-        return async.eachLimit(ids, 10, (id: string, done) => {
-            this.getStats(log, id, (err, res) => {
-                if (err) {
-                    return done(err);
-                }
-                requests += res.requests;
-                errors += res['500s'];
-                return done();
-            });
-        }, error => {
-            if (error) {
-                log.error('error getting stats', {
-                    error,
-                    method: 'StatsClient.getAllStats',
-                });
-                return cb(null, statsRes);
-            }
-            statsRes.requests = requests;
-            statsRes['500s'] = errors;
-            return cb(null, statsRes);
-        });
-    }
-
    /**
    * get stats for the last x seconds, x being the sampling duration
    * @param log - Werelogs request logger
@ -190,8 +123,8 @@ export default class StatsClient {
        const reqsKeys: ['get', string][] = [];
        const req500sKeys: ['get', string][] = [];
        for (let i = 0; i < totalKeys; i++) {
-            reqsKeys.push(['get', this.buildKey(`${id}:requests`, d)]);
-            req500sKeys.push(['get', this.buildKey(`${id}:500s`, d)]);
+            reqsKeys.push(['get', this._buildKey(`${id}:requests`, d)]);
+            req500sKeys.push(['get', this._buildKey(`${id}:500s`, d)]);
            this._setPrevInterval(d);
        }
        return async.parallel([
--- a/lib/metrics/StatsModel.ts
+++ b/lib/metrics/StatsModel.ts
@ -1,8 +1,4 @@
 import StatsClient from './StatsClient';
-import { Logger } from 'werelogs';
-import async from 'async';
-
-export type Callback = (error: Error | null, value?: any) => void;

 /**
 * @class StatsModel
@ -11,145 +7,12 @@ export type Callback = (error: Error | null, value?: any) => void;
 * rather than by seconds
 */
 export default class StatsModel extends StatsClient {
-    /**
-    * Utility method to convert 2d array rows to columns, and vice versa
-    * See also: https://docs.ruby-lang.org/en/2.0.0/Array.html#method-i-zip
-    * @param arrays - 2d array of integers
-    * @return converted array
-    */
-    _zip(arrays: number[][]) {
-        if (arrays.length > 0 && arrays.every(a => Array.isArray(a))) {
-            return arrays[0].map((_, i) => arrays.map(a => a[i]));
-        }
-        return [];
-    }
-
-    /**
-    * normalize to the nearest interval
-    * @param d - Date instance
-    * @return timestamp - normalized to the nearest interval
-    */
-    _normalizeTimestamp(d: Date) {
-        const m = d.getMinutes();
-        return d.setMinutes(m - m % (Math.floor(this._interval / 60)), 0, 0);
-    }
-
-    /**
-    * override the method to get the count as an array of integers separated
-    * by each interval
-    * typical input looks like [[null, '1'], [null, '2'], [null, null]...]
-    * @param arr - each index contains the result of each batch command
-    *   where index 0 signifies the error and index 1 contains the result
-    * @return array of integers, ordered from most recent interval to
-    *   oldest interval with length of (expiry / interval)
-    */
-    // @ts-expect-errors
-    _getCount(arr: [any, string | null][]): number[] {
-        const size = Math.floor(this._expiry / this._interval);
-        const array = arr.reduce((store, i) => {
-            let num = parseInt(i[1] ?? '', 10);
-            num = Number.isNaN(num) ? 0 : num;
-            store.push(num);
-            return store;
-        }, [] as number[]);
-
-        if (array.length < size) {
-            array.push(...Array(size - array.length).fill(0));
-        }
-        return array;
-    }
-
-    /**
-    * wrapper on `getStats` that handles a list of keys
-    * override the method to reduce the returned 2d array from `_getCount`
-    * @param log - Werelogs request logger
-    * @param ids - service identifiers
-    * @param cb - callback to call with the err/result
-    */
-    getAllStats(log: Logger, ids: string[], cb: Callback) {
-        if (!this._redis) {
-            return cb(null, {});
-        }
-
-        const size = Math.floor(this._expiry / this._interval);
-        const statsRes = {
-            'requests': Array(size).fill(0),
-            '500s': Array(size).fill(0),
-            'sampleDuration': this._expiry,
-        };
-        const requests: any[] = [];
-        const errors: any[] = [];
-
-        if (ids.length === 0) {
-            return cb(null, statsRes);
-        }
-
-        // for now set concurrency to default of 10
-        return async.eachLimit(ids, 10, (id, done) => {
-            this.getStats(log, id, (err, res) => {
-                if (err) {
-                    return done(err);
-                }
-                requests.push(res.requests);
-                errors.push(res['500s']);
-                return done();
-            });
-        }, error => {
-            if (error) {
-                log.error('error getting stats', {
-                    error,
-                    method: 'StatsModel.getAllStats',
-                });
-                return cb(null, statsRes);
-            }
-
-            statsRes.requests = this._zip(requests).map(arr =>
-                arr.reduce((acc, i) => acc + i), 0);
-            statsRes['500s'] = this._zip(errors).map(arr =>
-                arr.reduce((acc, i) => acc + i), 0);
-
-            return cb(null, statsRes);
-        });
-    }
-
-    /**
-     * Handles getting a list of global keys.
-     * @param ids - Service identifiers
-     * @param log - Werelogs request logger
-     * @param cb - Callback
-     */
-    getAllGlobalStats(ids: string[], log: Logger, cb: Callback) {
-        const reqsKeys = ids.map(key => (['get', key]));
-        return this._redis.batch(reqsKeys, (err, res) => {
-            const statsRes = { requests: 0 };
-            if (err) {
-                log.error('error getting metrics', {
-                    error: err,
-                    method: 'StatsClient.getAllGlobalStats',
-                });
-                return cb(null, statsRes);
-            }
-            statsRes.requests = res.reduce((sum, curr) => {
-                const [cmdErr, val] = curr;
-                if (cmdErr) {
-                    // Log any individual request errors from the batch request.
-                    log.error('error getting metrics', {
-                        error: cmdErr,
-                        method: 'StatsClient.getAllGlobalStats',
-                    });
-                }
-                return sum + (Number.parseInt(val, 10) || 0);
-            }, 0);
-            return cb(null, statsRes);
-        });
-    }
-
    /**
     * normalize date timestamp to the nearest hour
     * @param d - Date instance
     * @return timestamp - normalized to the nearest hour
     */
-    normalizeTimestampByHour(d: Date) {
+    normalizeTimestampByHour(d: Date): number {
        return d.setMinutes(0, 0, 0);
    }

@ -158,10 +21,40 @@ export default class StatsModel extends StatsClient {
     * @param d - Date instance
     * @return timestamp - one hour prior to date passed
     */
-    _getDatePreviousHour(d: Date) {
+    _getDatePreviousHour(d: Date): number {
        return d.setHours(d.getHours() - 1);
    }

+    /**
+     * normalize to the nearest interval
+     * @param d - Date instance
+     * @return timestamp - normalized to the nearest interval
+     */
+    _normalizeTimestamp(d: Date): number {
+        const m = d.getMinutes();
+        return d.setMinutes(m - m % (Math.floor(this._interval / 60)), 0, 0);
+    }
+
+    /**
+     * override the method to get the result as an array of integers separated
+     * by each interval
+     * typical input looks like [[null, '1'], [null, '2'], [null, null]...]
+     * @param arr - each index contains the result of each batch command
+     *   where index 0 signifies the error and index 1 contains the result
+     * @return array of integers, ordered from most recent interval to
+     *   oldest interval
+     */
+    // @ts-ignore
+    // TODO change name or conform to parent class method
+    _getCount(arr: [any, string | null][]) {
+        return arr.reduce<number[]>((store, i) => {
+            let num = parseInt(i[1] ?? '', 10);
+            num = Number.isNaN(num) ? 0 : num;
+            store.push(num);
+            return store;
+        }, []);
+    }
+
    /**
     * get list of sorted set key timestamps
     * @param epoch - epoch time
--- a/lib/models/BackendInfo.ts
+++ b/lib/models/BackendInfo.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import { legacyLocations } from '../constants';
 import escapeForXml from '../s3middleware/escapeForXml';

--- a/lib/models/BucketAzureInfo.ts
+++ b/lib/models/BucketAzureInfo.ts
@ -1,281 +0,0 @@
-export type DeleteRetentionPolicy = {
-    enabled: boolean;
-    days: number;
-};
-
-/**
- * Helper class to ease access to the Azure specific information for
- * storage accounts mapped to buckets.
- */
-export default class BucketAzureInfo {
-    _data: {
-        sku: string;
-        accessTier: string;
-        kind: string;
-        systemKeys: string[];
-        tenantKeys: string[];
-        subscriptionId: string;
-        resourceGroup: string;
-        deleteRetentionPolicy: DeleteRetentionPolicy;
-        managementPolicies: any[];
-        httpsOnly: boolean;
-        tags: any;
-        networkACL: any[];
-        cname: string;
-        azureFilesAADIntegration: boolean;
-        hnsEnabled: boolean;
-        logging: any;
-        hourMetrics: any;
-        minuteMetrics: any;
-        serviceVersion: string;
-    }
-    /**
-     * @constructor
-     * @param obj - Raw structure for the Azure info on storage account
-     * @param obj.sku - SKU name of this storage account
-     * @param obj.accessTier - Access Tier name of this storage account
-     * @param obj.kind - Kind name of this storage account
-     * @param obj.systemKeys - pair of shared keys for the system
-     * @param obj.tenantKeys - pair of shared keys for the tenant
-     * @param obj.subscriptionId - subscription ID the storage account
-     *   belongs to
-     * @param obj.resourceGroup - Resource group name the storage
-     *   account belongs to
-     * @param obj.deleteRetentionPolicy - Delete retention policy
-     * @param obj.deleteRetentionPolicy.enabled -
-     * @param obj.deleteRetentionPolicy.days -
-     * @param obj.managementPolicies - Management policies for this
-     *   storage account
-     * @param obj.httpsOnly - Server the content of this storage
-     *   account through HTTPS only
-     * @param obj.tags - Set of tags applied on this storage account
-     * @param obj.networkACL - Network ACL of this storage account
-     * @param obj.cname - CNAME of this storage account
-     * @param obj.azureFilesAADIntegration - whether or not Azure
-     *   Files AAD Integration is enabled for this storage account
-     * @param obj.hnsEnabled - whether or not a hierarchical namespace
-     *   is enabled for this storage account
-     * @param obj.logging - service properties: logging
-     * @param obj.hourMetrics - service properties: hourMetrics
-     * @param obj.minuteMetrics - service properties: minuteMetrics
-     * @param obj.serviceVersion - service properties: serviceVersion
-     */
-    constructor(obj: {
-        sku: string;
-        accessTier: string;
-        kind: string;
-        systemKeys: string[];
-        tenantKeys: string[];
-        subscriptionId: string;
-        resourceGroup: string;
-        deleteRetentionPolicy: DeleteRetentionPolicy;
-        managementPolicies: any[];
-        httpsOnly: boolean;
-        tags: any;
-        networkACL: any[];
-        cname: string;
-        azureFilesAADIntegration: boolean;
-        hnsEnabled: boolean;
-        logging: any;
-        hourMetrics: any;
-        minuteMetrics: any;
-        serviceVersion: string;
-    }) {
-        this._data = {
-            sku: obj.sku,
-            accessTier: obj.accessTier,
-            kind: obj.kind,
-            systemKeys: obj.systemKeys,
-            tenantKeys: obj.tenantKeys,
-            subscriptionId: obj.subscriptionId,
-            resourceGroup: obj.resourceGroup,
-            deleteRetentionPolicy: obj.deleteRetentionPolicy,
-            managementPolicies: obj.managementPolicies,
-            httpsOnly: obj.httpsOnly,
-            tags: obj.tags,
-            networkACL: obj.networkACL,
-            cname: obj.cname,
-            azureFilesAADIntegration: obj.azureFilesAADIntegration,
-            hnsEnabled: obj.hnsEnabled,
-            logging: obj.logging,
-            hourMetrics: obj.hourMetrics,
-            minuteMetrics: obj.minuteMetrics,
-            serviceVersion: obj.serviceVersion,
-        };
-    }
-
-    getSku() {
-        return this._data.sku;
-    }
-
-    setSku(sku: string) {
-        this._data.sku = sku;
-        return this;
-    }
-
-    getAccessTier() {
-        return this._data.accessTier;
-    }
-
-    setAccessTier(accessTier: string) {
-        this._data.accessTier = accessTier;
-        return this;
-    }
-
-    getKind() {
-        return this._data.kind;
-    }
-
-    setKind(kind: string) {
-        this._data.kind = kind;
-        return this;
-    }
-
-    getSystemKeys() {
-        return this._data.systemKeys;
-    }
-
-    setSystemKeys(systemKeys: string[]) {
-        this._data.systemKeys = systemKeys;
-        return this;
-    }
-
-    getTenantKeys() {
-        return this._data.tenantKeys;
-    }
-
-    setTenantKeys(tenantKeys: string[]) {
-        this._data.tenantKeys = tenantKeys;
-        return this;
-    }
-
-    getSubscriptionId() {
-        return this._data.subscriptionId;
-    }
-
-    setSubscriptionId(subscriptionId: string) {
-        this._data.subscriptionId = subscriptionId;
-        return this;
-    }
-
-    getResourceGroup() {
-        return this._data.resourceGroup;
-    }
-
-    setResourceGroup(resourceGroup: string) {
-        this._data.resourceGroup = resourceGroup;
-        return this;
-    }
-
-    getDeleteRetentionPolicy() {
-        return this._data.deleteRetentionPolicy;
-    }
-
-    setDeleteRetentionPolicy(deleteRetentionPolicy: DeleteRetentionPolicy) {
-        this._data.deleteRetentionPolicy = deleteRetentionPolicy;
-        return this;
-    }
-
-    getManagementPolicies() {
-        return this._data.managementPolicies;
-    }
-
-    setManagementPolicies(managementPolicies: any[]) {
-        this._data.managementPolicies = managementPolicies;
-        return this;
-    }
-
-    getHttpsOnly() {
-        return this._data.httpsOnly;
-    }
-
-    setHttpsOnly(httpsOnly: boolean) {
-        this._data.httpsOnly = httpsOnly;
-        return this;
-    }
-
-    getTags() {
-        return this._data.tags;
-    }
-
-    setTags(tags: any) {
-        this._data.tags = tags;
-        return this;
-    }
-
-    getNetworkACL() {
-        return this._data.networkACL;
-    }
-
-    setNetworkACL(networkACL: any[]) {
-        this._data.networkACL = networkACL;
-        return this;
-    }
-
-    getCname() {
-        return this._data.cname;
-    }
-
-    setCname(cname: string) {
-        this._data.cname = cname;
-        return this;
-    }
-
-    getAzureFilesAADIntegration() {
-        return this._data.azureFilesAADIntegration;
-    }
-
-    setAzureFilesAADIntegration(azureFilesAADIntegration: boolean) {
-        this._data.azureFilesAADIntegration = azureFilesAADIntegration;
-        return this;
-    }
-
-    getHnsEnabled() {
-        return this._data.hnsEnabled;
-    }
-
-    setHnsEnabled(hnsEnabled: boolean) {
-        this._data.hnsEnabled = hnsEnabled;
-        return this;
-    }
-
-    getLogging() {
-        return this._data.logging;
-    }
-
-    setLogging(logging: any) {
-        this._data.logging = logging;
-        return this;
-    }
-
-    getHourMetrics() {
-        return this._data.hourMetrics;
-    }
-
-    setHourMetrics(hourMetrics: any) {
-        this._data.hourMetrics = hourMetrics;
-        return this;
-    }
-
-    getMinuteMetrics() {
-        return this._data.minuteMetrics;
-    }
-
-    setMinuteMetrics(minuteMetrics: any) {
-        this._data.minuteMetrics = minuteMetrics;
-        return this;
-    }
-
-    getServiceVersion() {
-        return this._data.serviceVersion;
-    }
-
-    setServiceVersion(serviceVersion: any) {
-        this._data.serviceVersion = serviceVersion;
-        return this;
-    }
-
-    getValue() {
-        return this._data;
-    }
-}
--- a/lib/models/BucketInfo.ts
+++ b/lib/models/BucketInfo.ts
@ -8,12 +8,10 @@ import ObjectLockConfiguration from './ObjectLockConfiguration';
 import BucketPolicy from './BucketPolicy';
 import NotificationConfiguration from './NotificationConfiguration';
 import { ACL as OACL } from './ObjectMD';
-import { areTagsValid, BucketTag } from '../s3middleware/tagging';

 // WHEN UPDATING THIS NUMBER, UPDATE BucketInfoModelVersion.md CHANGELOG
-// BucketInfoModelVersion.md can be found in documentation/ at the root
-// of this repository
-const modelVersion = 16;
+// BucketInfoModelVersion.md can be found in the root of this repository
+const modelVersion = 10;

 export type CORS = {
    id: string;
@ -37,41 +35,6 @@ export type VersioningConfiguration = {
    MfaDelete: any;
 };

-export type VeeamSOSApi = {
-    SystemInfo?: {
-        ProtocolVersion: string,
-        ModelName: string,
-        ProtocolCapabilities: {
-            CapacityInfo: boolean,
-            UploadSessions: boolean,
-            IAMSTS?: boolean,
-        },
-        APIEndpoints?: {
-            IAMEndpoint: string,
-            STSEndpoint: string,
-        },
-        SystemRecommendations?: {
-            S3ConcurrentTaskLimit: number,
-            S3MultiObjectDelete: number,
-            StorageCurrentTasksLimit: number,
-            KbBlockSize: number,
-        }
-        LastModified?: string,
-    },
-    CapacityInfo?: {
-        Capacity: number,
-        Available: number,
-        Used: number,
-        LastModified?: string,
-    },
-};
-
-// Capabilities contains all specifics from external products supported by
-// our S3 implementation, at bucket level
-export type Capabilities = {
-    VeeamSOSApi?: VeeamSOSApi,
-};
-
 export type ACL = OACL & { WRITE: string[] }

 export default class BucketInfo {
@ -95,70 +58,56 @@ export default class BucketInfo {
    _objectLockEnabled?: boolean;
    _objectLockConfiguration?: any;
    _notificationConfiguration?: any;
-    _tags?: Array<BucketTag>;
-    _readLocationConstraint: string | null;
-    _isNFS: boolean | null;
-    _azureInfo: any | null;
-    _ingestion: { status: 'enabled' | 'disabled' } | null;
-    _capabilities?: Capabilities;
-    _quotaMax: number | 0;
+    _tags?: { key: string; value: string }[] | null;

    /**
    * Represents all bucket information.
    * @constructor
-    * @param name - bucket name
-    * @param owner - bucket owner's name
-    * @param ownerDisplayName - owner's display name
-    * @param creationDate - creation date of bucket
-    * @param mdBucketModelVersion - bucket model version
-    * @param [acl] - bucket ACLs (no need to copy
+    * @param {string} name - bucket name
+    * @param {string} owner - bucket owner's name
+    * @param {string} ownerDisplayName - owner's display name
+    * @param {object} creationDate - creation date of bucket
+    * @param {number} mdBucketModelVersion - bucket model version
+    * @param {object} [acl] - bucket ACLs (no need to copy
    * ACL object since referenced object will not be used outside of
    * BucketInfo instance)
-    * @param transient - flag indicating whether bucket is transient
-    * @param deleted - flag indicating whether attempt to delete
-    * @param serverSideEncryption - sse information for this bucket
-    * @param serverSideEncryption.cryptoScheme -
+    * @param {boolean} transient - flag indicating whether bucket is transient
+    * @param {boolean} deleted - flag indicating whether attempt to delete
+    * @param {object} serverSideEncryption - sse information for this bucket
+    * @param {number} serverSideEncryption.cryptoScheme -
    * cryptoScheme used
-    * @param serverSideEncryption.algorithm -
+    * @param {string} serverSideEncryption.algorithm -
    * algorithm to use
-    * @param serverSideEncryption.masterKeyId -
+    * @param {string} serverSideEncryption.masterKeyId -
    * key to get master key
-    * @param serverSideEncryption.configuredMasterKeyId -
+    * @param {string} serverSideEncryption.configuredMasterKeyId -
    * custom KMS key id specified by user
-    * @param serverSideEncryption.mandatory -
+    * @param {boolean} serverSideEncryption.mandatory -
    * true for mandatory encryption
    * bucket has been made
-    * @param versioningConfiguration - versioning configuration
-    * @param versioningConfiguration.Status - versioning status
-    * @param versioningConfiguration.MfaDelete - versioning mfa delete
-    * @param locationConstraint - locationConstraint for bucket that
-    * also includes the ingestion flag
-    * @param [websiteConfiguration] - website
+    * @param {object} versioningConfiguration - versioning configuration
+    * @param {string} versioningConfiguration.Status - versioning status
+    * @param {object} versioningConfiguration.MfaDelete - versioning mfa delete
+    * @param {string} locationConstraint - locationConstraint for bucket
+    * @param {WebsiteConfiguration} [websiteConfiguration] - website
    * configuration
-    * @param [cors] - collection of CORS rules to apply
-    * @param [cors[].id] - optional ID to identify rule
-    * @param cors[].allowedMethods - methods allowed for CORS request
-    * @param cors[].allowedOrigins - origins allowed for CORS request
-    * @param [cors[].allowedHeaders] - headers allowed in an OPTIONS
+    * @param {object[]} [cors] - collection of CORS rules to apply
+    * @param {string} [cors[].id] - optional ID to identify rule
+    * @param {string[]} cors[].allowedMethods - methods allowed for CORS request
+    * @param {string[]} cors[].allowedOrigins - origins allowed for CORS request
+    * @param {string[]} [cors[].allowedHeaders] - headers allowed in an OPTIONS
    * request via the Access-Control-Request-Headers header
-    * @param [cors[].maxAgeSeconds] - seconds browsers should cache
+    * @param {number} [cors[].maxAgeSeconds] - seconds browsers should cache
    * OPTIONS response
-    * @param [cors[].exposeHeaders] - headers expose to applications
-    * @param [replicationConfiguration] - replication configuration
-    * @param [lifecycleConfiguration] - lifecycle configuration
-    * @param [bucketPolicy] - bucket policy
-    * @param [uid] - unique identifier for the bucket, necessary
-    * @param readLocationConstraint - readLocationConstraint for bucket
-    * addition for use with lifecycle operations
-    * @param [isNFS] - whether the bucket is on NFS
-    * @param [ingestionConfig] - object for ingestion status: en/dis
-    * @param [azureInfo] - Azure storage account specific info
-    * @param [objectLockEnabled] - true when object lock enabled
-    * @param [objectLockConfiguration] - object lock configuration
-    * @param [notificationConfiguration] - bucket notification configuration
-    * @param [tags] - bucket tag set
-    * @param [capabilities] - capabilities for the bucket
-    * @param quotaMax - bucket quota
+    * @param {string[]} [cors[].exposeHeaders] - headers expose to applications
+    * @param {object} [replicationConfiguration] - replication configuration
+    * @param {object} [lifecycleConfiguration] - lifecycle configuration
+    * @param {object} [bucketPolicy] - bucket policy
+    * @param {string} [uid] - unique identifier for the bucket, necessary
+    * @param {boolean} [objectLockEnabled] - true when object lock enabled
+    * @param {object} [objectLockConfiguration] - object lock configuration
+    * @param {object} [notificationConfiguration] - bucket notification configuration
+    * @param {object[]} [tags] - bucket tags
    */
    constructor(
        name: string,
@ -178,16 +127,10 @@ export default class BucketInfo {
        lifecycleConfiguration?: any,
        bucketPolicy?: any,
        uid?: string,
-        readLocationConstraint?: string,
-        isNFS?: boolean,
-        ingestionConfig?: { status: 'enabled' | 'disabled' },
-        azureInfo?: any,
        objectLockEnabled?: boolean,
        objectLockConfiguration?: any,
        notificationConfiguration?: any,
-        tags?: Array<BucketTag> | [],
-        capabilities?: Capabilities,
-        quotaMax?: number | 0,
+        tags?: { key: string; value: string }[],
    ) {
        assert.strictEqual(typeof name, 'string');
        assert.strictEqual(typeof owner, 'string');
@ -229,15 +172,6 @@ export default class BucketInfo {
        if (locationConstraint) {
            assert.strictEqual(typeof locationConstraint, 'string');
        }
-        if (ingestionConfig) {
-            assert.strictEqual(typeof ingestionConfig, 'object');
-        }
-        if (azureInfo) {
-            assert.strictEqual(typeof azureInfo, 'object');
-        }
-        if (readLocationConstraint) {
-            assert.strictEqual(typeof readLocationConstraint, 'string');
-        }
        if (websiteConfiguration) {
            assert(websiteConfiguration instanceof WebsiteConfiguration);
            const indexDocument = websiteConfiguration.getIndexDocument();
@ -283,14 +217,8 @@ export default class BucketInfo {
            READ: [],
            READ_ACP: [],
        };
-
-        if (tags === undefined) {
-            tags = [] as BucketTag[];
-        }
-        assert.strictEqual(areTagsValid(tags), true);
-        if (quotaMax) {
-            assert.strictEqual(typeof quotaMax, 'number');
-            assert(quotaMax >= 0, 'Quota cannot be negative');
+        if (tags) {
+            assert(Array.isArray(tags));
        }

        // IF UPDATING PROPERTIES, INCREMENT MODELVERSION NUMBER ABOVE
@ -305,22 +233,16 @@ export default class BucketInfo {
        this._serverSideEncryption = serverSideEncryption || null;
        this._versioningConfiguration = versioningConfiguration || null;
        this._locationConstraint = locationConstraint || null;
-        this._readLocationConstraint = readLocationConstraint || null;
        this._websiteConfiguration = websiteConfiguration || null;
        this._replicationConfiguration = replicationConfiguration || null;
        this._cors = cors || null;
        this._lifecycleConfiguration = lifecycleConfiguration || null;
        this._bucketPolicy = bucketPolicy || null;
        this._uid = uid || uuid();
-        this._isNFS = isNFS || null;
-        this._ingestion = ingestionConfig || null;
-        this._azureInfo = azureInfo || null;
        this._objectLockEnabled = objectLockEnabled || false;
        this._objectLockConfiguration = objectLockConfiguration || null;
        this._notificationConfiguration = notificationConfiguration || null;
-        this._tags = tags;
-        this._capabilities = capabilities || undefined;
-        this._quotaMax = quotaMax || 0;
+        this._tags = tags || null;
        return this;
    }

@ -341,22 +263,16 @@ export default class BucketInfo {
            serverSideEncryption: this._serverSideEncryption,
            versioningConfiguration: this._versioningConfiguration,
            locationConstraint: this._locationConstraint,
-            readLocationConstraint: this._readLocationConstraint,
            websiteConfiguration: undefined,
            cors: this._cors,
            replicationConfiguration: this._replicationConfiguration,
            lifecycleConfiguration: this._lifecycleConfiguration,
            bucketPolicy: this._bucketPolicy,
            uid: this._uid,
-            isNFS: this._isNFS,
-            ingestion: this._ingestion,
-            azureInfo: this._azureInfo,
            objectLockEnabled: this._objectLockEnabled,
            objectLockConfiguration: this._objectLockConfiguration,
            notificationConfiguration: this._notificationConfiguration,
            tags: this._tags,
-            capabilities: this._capabilities,
-            quotaMax: this._quotaMax,
        };
        const final = this._websiteConfiguration
            ? {
@ -380,10 +296,8 @@ export default class BucketInfo {
            obj.transient, obj.deleted, obj.serverSideEncryption,
            obj.versioningConfiguration, obj.locationConstraint, websiteConfig,
            obj.cors, obj.replicationConfiguration, obj.lifecycleConfiguration,
-            obj.bucketPolicy, obj.uid, obj.readLocationConstraint, obj.isNFS,
-            obj.ingestion, obj.azureInfo, obj.objectLockEnabled,
-            obj.objectLockConfiguration, obj.notificationConfiguration, obj.tags,
-            obj.capabilities, obj.quotaMax);
+            obj.bucketPolicy, obj.uid, obj.objectLockEnabled,
+            obj.objectLockConfiguration, obj.notificationConfiguration, obj.tags);
    }

    /**
@ -407,11 +321,8 @@ export default class BucketInfo {
            data._versioningConfiguration, data._locationConstraint,
            data._websiteConfiguration, data._cors,
            data._replicationConfiguration, data._lifecycleConfiguration,
-            data._bucketPolicy, data._uid, data._readLocationConstraint,
-            data._isNFS, data._ingestion, data._azureInfo,
-            data._objectLockEnabled, data._objectLockConfiguration,
-            data._notificationConfiguration, data._tags, data._capabilities,
-            data._quotaMax);
+            data._bucketPolicy, data._uid, data._objectLockEnabled,
+            data._objectLockConfiguration, data._notificationConfiguration, data._tags);
    }

    /**
@ -708,17 +619,6 @@ export default class BucketInfo {
        return this._locationConstraint;
    }

-    /**
-    * Get read location constraint.
-    * @return - bucket read location constraint
-    */
-    getReadLocationConstraint() {
-        if (this._readLocationConstraint) {
-            return this._readLocationConstraint;
-        }
-        return this._locationConstraint;
-    }
-
    /**
     * Set Bucket model version
     *
@ -807,85 +707,6 @@ export default class BucketInfo {
        this._uid = uid;
        return this;
    }
-    /**
-     * Check if the bucket is an NFS bucket.
-     * @return - Wether the bucket is NFS or not
-     */
-    isNFS() {
-        return this._isNFS;
-    }
-    /**
-     * Set whether the bucket is an NFS bucket.
-     * @param isNFS - Wether the bucket is NFS or not
-     * @return - bucket info instance
-     */
-    setIsNFS(isNFS: boolean) {
-        this._isNFS = isNFS;
-        return this;
-    }
-    /**
-     * enable ingestion, set 'this._ingestion' to { status: 'enabled' }
-     * @return - bucket info instance
-     */
-    enableIngestion() {
-        this._ingestion = { status: 'enabled' };
-        return this;
-    }
-    /**
-     * disable ingestion, set 'this._ingestion' to { status: 'disabled' }
-     * @return - bucket info instance
-     */
-    disableIngestion() {
-        this._ingestion = { status: 'disabled' };
-        return this;
-    }
-    /**
-     * Get ingestion configuration
-     * @return - bucket ingestion configuration: Enabled or Disabled
-     */
-    getIngestion() {
-        return this._ingestion;
-    }
-
-    /**
-     ** Check if bucket is an ingestion bucket
-     * @return - 'true' if bucket is ingestion bucket, 'false' if
-     * otherwise
-     */
-    isIngestionBucket() {
-        const ingestionConfig = this.getIngestion();
-        if (ingestionConfig) {
-            return true;
-        }
-        return false;
-    }
-    /**
-     * Check if ingestion is enabled
-     * @return - 'true' if ingestion is enabled, otherwise 'false'
-     */
-    isIngestionEnabled() {
-        const ingestionConfig = this.getIngestion();
-        return ingestionConfig ? ingestionConfig.status === 'enabled' : false;
-    }
-
-    /**
-     * Return the Azure specific storage account information for this bucket
-     * @return - a structure suitable for {@link BucketAzureIno}
-     *   constructor
-     */
-    getAzureInfo() {
-        return this._azureInfo;
-    }
-    /**
-     * Set the Azure specific storage account information for this bucket
-     * @param azureInfo - a structure suitable for
-     *   {@link BucketAzureInfo} construction
-     * @return - bucket info instance
-     */
-    setAzureInfo(azureInfo: any) {
-        this._azureInfo = azureInfo;
-        return this;
-    }
    /**
    * Check if object lock is enabled.
    * @return - depending on whether object lock is enabled
@ -905,7 +726,7 @@ export default class BucketInfo {

    /**
     * Get the value of bucket tags
-     * @return - Array of bucket tags
+     * @return - Array of bucket tags as {"key" : "key", "value": "value"}
     */
    getTags() {
        return this._tags;
@ -913,58 +734,13 @@ export default class BucketInfo {

    /**
     * Set bucket tags
+     * @param tags - collection of tags
+     * @param tags[].key - key of the tag
+     * @param tags[].value - value of the tag
     * @return - bucket info instance
     */
-    setTags(tags: Array<BucketTag>) {
+    setTags(tags: { key: string; value: string }[]) {
        this._tags = tags;
        return this;
    }
-
-    /**
-     * Get the value of bucket capabilities
-     * @return - capabilities of the bucket
-     */
-    getCapabilities() {
-        return this._capabilities;
-    }
-
-    /**
-     * Get a specific bucket capability
-     * 
-     * @param capability? - if provided, will return a specific capacity
-     * @return - capability of the bucket
-     */
-    getCapability(capability: string) : VeeamSOSApi | undefined {
-        if (capability && this._capabilities && this._capabilities[capability]) {
-            return this._capabilities[capability];
-        }
-        return undefined;
-    }
-    
-    /**
-     * Set bucket capabilities
-     * @return - bucket info instance
-     */
-    setCapabilities(capabilities: Capabilities) {
-        this._capabilities = capabilities;
-        return this;
-    }
-
-    /**
-     * Get the bucket quota information
-     * @return quotaMax
-     */
-    getQuota() {
-        return this._quotaMax;
-    }
-    
-    /**
-     * Set bucket quota
-     * @param quota - quota to be set
-     * @return - bucket quota info
-     */
-    setQuota(quota: number) {
-        this._quotaMax = quota || 0;
-        return this;
-    }
 }
--- a/lib/models/LifecycleConfiguration.ts
+++ b/lib/models/LifecycleConfiguration.ts
@ -7,8 +7,6 @@ import escapeForXml from '../s3middleware/escapeForXml';
 import type { XMLRule } from './ReplicationConfiguration';
 import { Status } from './LifecycleRule';

-const MAX_DAYS = 2147483647; // Max 32-bit signed binary integer.
-
 /**
 * Format of xml request:

@ -89,7 +87,6 @@ export default class LifecycleConfiguration {
    _parsedXML: any;
    _ruleIDs: string[];
    _tagKeys: string[];
-    _storageClasses: string[];
    _config: {
        error?: ArsenalError;
        rules?: any[];
@ -98,13 +95,10 @@ export default class LifecycleConfiguration {
    /**
     * Create a Lifecycle Configuration instance
     * @param xml - the parsed xml
-     * @param config - the CloudServer config
     * @return - LifecycleConfiguration instance
     */
-    constructor(xml: any, config: { replicationEndpoints: { site: string }[] }) {
+    constructor(xml: any) {
        this._parsedXML = xml;
-        this._storageClasses =
-            config.replicationEndpoints.map(endpoint => endpoint.site);
        this._ruleIDs = [];
        this._tagKeys = [];
        this._config = {};
@ -225,6 +219,11 @@ export default class LifecycleConfiguration {
     * }
     */
    _parseRule(rule: XMLRule) {
+        if (rule.Transition || rule.NoncurrentVersionTransition) {
+            const msg = 'Transition lifecycle action not yet implemented';
+            const error = errors.NotImplemented.customizeDescription(msg);
+            return { error };
+        }
        // Either Prefix or Filter must be included, but can be empty string
        if ((!rule.Filter && rule.Filter !== '') &&
        (!rule.Prefix && rule.Prefix !== '')) {
@ -493,366 +492,6 @@ export default class LifecycleConfiguration {
        return { ...base, ruleStatus: status }
    }

-    /**
-     * Finds the prefix and/or tags of the given rule and gets the error message
-     * @param rule - The rule to find the prefix in
-     * @return - The prefix of filter information
-     */
-    _getRuleFilterDesc(rule: { Prefix?: string[]; Filter?: any[] }) {
-        if (rule.Prefix) {
-            return `prefix '${rule.Prefix[0]}'`;
-        }
-        // There must be a filter if no top-level prefix is provided. First
-        // check if there are multiple filters (i.e. `Filter.And`).
-        if (rule.Filter?.[0] === undefined || rule.Filter[0].And === undefined) {
-            const { Prefix, Tag } = rule.Filter?.[0] || {};
-            if (Prefix) {
-                return `filter '(prefix=${Prefix[0]})'`;
-            }
-            if (Tag) {
-                const { Key, Value } = Tag[0];
-                return `filter '(tag: key=${Key[0]}, value=${Value[0]})'`;
-            }
-            return 'filter (all)';
-        }
-        const filters: string[] = [];
-        const { Prefix, Tag } = rule.Filter[0].And[0];
-        if (Prefix) {
-            filters.push(`prefix=${Prefix[0]}`);
-        }
-        Tag.forEach((tag: { Key: string[]; Value: string[] }) => {
-            const { Key, Value } = tag;
-            filters.push(`tag: key=${Key[0]}, value=${Value[0]}`);
-        });
-        const joinedFilters = filters.join(' and ');
-        return `filter '(${joinedFilters})'`;
-    }
-
-    /**
-     * Checks the validity of the given field
-     * @param params - Given function parameters
-     * @param params.days - The value of the field to check
-     * @param params.field - The field name with the value
-     * @param params.ancestor - The immediate ancestor field
-     * @return Returns an error object or `null`
-     */
-    _checkDays(params: { days: number; field: string; ancestor: string }) {
-        const { days, field, ancestor } = params;
-        if (days < 0) {
-            const msg = `'${field}' in ${ancestor} action must be nonnegative`;
-            return errors.InvalidArgument.customizeDescription(msg);
-        }
-        if (days > MAX_DAYS) {
-            return errors.MalformedXML.customizeDescription(
-                `'${field}' in ${ancestor} action must not exceed ${MAX_DAYS}`);
-        }
-        return null;
-    }
-
-    /**
-     * Checks the validity of the given storage class
-     * @param params - Given function parameters
-     * @param params.usedStorageClasses - Storage classes used in other
-     * rules
-     * @param params.storageClass - The storage class of the current
-     * rule
-     * @param params.ancestor - The immediate ancestor field
-     * @param params.prefix - The prefix of the rule
-     * @return Returns an error object or `null`
-     */
-    _checkStorageClasses(params: {
-        usedStorageClasses: string[];
-        storageClass: string;
-        ancestor: string;
-        rule: { Prefix?: string[]; Filter?: any };
-    }) {
-        const { usedStorageClasses, storageClass, ancestor, rule } = params;
-        if (!this._storageClasses.includes(storageClass)) {
-            // This differs from the AWS message. This will help the user since
-            // the StorageClass does not conform to AWS specs.
-            const list = `'${this._storageClasses.join("', '")}'`;
-            const msg = `'StorageClass' must be one of ${list}`;
-            return errors.MalformedXML.customizeDescription(msg);
-        }
-        if (usedStorageClasses.includes(storageClass)) {
-            const msg = `'StorageClass' must be different for '${ancestor}' ` +
-                `actions in same 'Rule' with ${this._getRuleFilterDesc(rule)}`;
-            return errors.InvalidRequest.customizeDescription(msg);
-        }
-        return null;
-    }
-
-    /**
-     * Ensure that transition rules are at least a day apart from each other.
-     * @param params - Given function parameters
-     * @param [params.days] - The days of the current transition
-     * @param [params.date] - The date of the current transition
-     * @param params.storageClass - The storage class of the current
-     * rule
-     * @param params.rule - The current rule
-     */
-    _checkTimeGap(params: {
-        days?: number;
-        date?: string;
-        storageClass: string;
-        rule: { Transition: any[]; Prefix?: string[]; Filter?: any };
-    }) {
-        const { days, date, storageClass, rule } = params;
-        const invalidTransition = rule.Transition.find(transition => {
-            if (storageClass === transition.StorageClass[0]) {
-                return false;
-            }
-            if (days !== undefined) {
-                return Number.parseInt(transition.Days[0], 10) === days;
-            }
-            if (date !== undefined) {
-                const timestamp = new Date(date).getTime();
-                const compareTimestamp = new Date(transition.Date[0]).getTime();
-                const oneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.
-                return Math.abs(timestamp - compareTimestamp) < oneDay;
-            }
-            return false;
-        });
-        if (invalidTransition) {
-            const timeType = days !== undefined ? 'Days' : 'Date';
-            const filterMsg = this._getRuleFilterDesc(rule);
-            const compareStorageClass = invalidTransition.StorageClass[0];
-            const msg = `'${timeType}' in the 'Transition' action for ` +
-                `StorageClass '${storageClass}' for ${filterMsg} must be at ` +
-                `least one day apart from ${filterMsg} in the 'Transition' ` +
-                `action for StorageClass '${compareStorageClass}'`;
-            return errors.InvalidArgument.customizeDescription(msg);
-        }
-        return null;
-    }
-
-    /**
-     * Checks transition time type (i.e. 'Date' or 'Days') only occurs once
-     * across transitions and across transitions and expiration policies
-     * @param params - Given function parameters
-     * @param params.usedTimeType - The time type that has been used by
-     * another rule
-     * @param params.currentTimeType - the time type used by the
-     * current rule
-     * @param params.rule - The current rule
-     * @return Returns an error object or `null`
-     */
-    _checkTimeType(params: {
-        usedTimeType: string | null;
-        currentTimeType: string;
-        rule: { Prefix?: string[]; Filter?: any; Expiration?: any[] };
-    }) {
-        const { usedTimeType, currentTimeType, rule } = params;
-        if (usedTimeType && usedTimeType !== currentTimeType) {
-            const msg = "Found mixed 'Date' and 'Days' based Transition " +
-                'actions in lifecycle rule for ' +
-                `${this._getRuleFilterDesc(rule)}`;
-            return errors.InvalidRequest.customizeDescription(msg);
-        }
-        // Transition time type cannot differ from the expiration, if provided.
-        if (rule.Expiration &&
-            rule.Expiration[0][currentTimeType] === undefined) {
-            const msg = "Found mixed 'Date' and 'Days' based Expiration and " +
-                'Transition actions in lifecycle rule for ' +
-                `${this._getRuleFilterDesc(rule)}`;
-            return errors.InvalidRequest.customizeDescription(msg);
-        }
-        return null;
-    }
-
-    /**
-     * Checks the validity of the given date
-     * @param date - The date the check
-     * @return Returns an error object or `null`
-     */
-    _checkDate(date: string) {
-        const isoRegex = new RegExp(
-            "^(-?(?:[1-9][0-9]*)?[0-9]{4})" + // Year
-            "-(1[0-2]|0[1-9])" + // Month
-            "-(3[01]|0[1-9]|[12][0-9])" + // Day
-            "T(2[0-3]|[01][0-9])" + // Hour
-            ":([0-5][0-9])" + // Minute
-            ":([0-5][0-9])" + // Second
-            "(\\.[0-9]+)?" + // Fractional second
-            "(Z|[+-][01][0-9]:[0-5][0-9])?$", // Timezone
-            "g"
-        );
-        const matches = [...date.matchAll(isoRegex)];
-        if (matches.length !== 1) {
-            const msg = 'Date must be in ISO 8601 format';
-            return errors.InvalidArgument.customizeDescription(msg);
-        }
-        // Check for a timezone in the last match group. If none, add a Z to indicate UTC.
-        if (!matches[0][matches[0].length-1]) {
-            date += 'Z';
-        }
-        const dateObj = new Date(date);
-        if (Number.isNaN(dateObj.getTime())) {
-            const msg = 'Date is not a valid date';
-            return errors.InvalidArgument.customizeDescription(msg);
-        }
-        if (dateObj.getUTCHours() !== 0
-            || dateObj.getUTCMinutes() !== 0
-            || dateObj.getUTCSeconds() !== 0
-            || dateObj.getUTCMilliseconds() !== 0) {
-            const msg = '\'Date\' must be at midnight GMT';
-            return errors.InvalidArgument.customizeDescription(msg);
-        }
-        return null;
-    }
-
-    /**
-     * Parses the NonCurrentVersionTransition value
-     * @param rule - Rule object from Rule array from this._parsedXml
-     * @return - Contains error if parsing failed, otherwise contains
-     * the parsed nonCurrentVersionTransition array
-     *
-     * Format of result:
-     * result = {
-     *      error: <error>,
-     *      nonCurrentVersionTransition: [
-     *          {
-     *              noncurrentDays: <non-current-days>,
-     *              storageClass: <storage-class>,
-     *          },
-     *          ...
-     *      ]
-     * }
-     */
-    _parseNoncurrentVersionTransition(rule: {
-        NoncurrentVersionTransition: any[];
-        Prefix?: string[];
-        Filter?: any;
-    }) {
-        const nonCurrentVersionTransition: {
-            noncurrentDays: number;
-            storageClass: string;
-        }[] = [];
-        const usedStorageClasses: string[] = [];
-        for (let i = 0; i < rule.NoncurrentVersionTransition.length; i++) {
-            const t = rule.NoncurrentVersionTransition[i]; // Transition object
-            const noncurrentDays: number | undefined =
-                t.NoncurrentDays && Number.parseInt(t.NoncurrentDays[0], 10);
-            const storageClass: string | undefined = t.StorageClass && t.StorageClass[0];
-            if (noncurrentDays === undefined || storageClass === undefined) {
-                return { error: errors.MalformedXML };
-            }
-            let error = this._checkDays({
-                days: noncurrentDays,
-                field: 'NoncurrentDays',
-                ancestor: 'NoncurrentVersionTransition',
-            });
-            if (error) {
-                return { error };
-            }
-            error = this._checkStorageClasses({
-                storageClass,
-                usedStorageClasses,
-                ancestor: 'NoncurrentVersionTransition',
-                rule,
-            });
-            if (error) {
-                return { error };
-            }
-            nonCurrentVersionTransition.push({ noncurrentDays, storageClass });
-            usedStorageClasses.push(storageClass);
-        }
-        return { nonCurrentVersionTransition };
-    }
-
-    /**
-     * Parses the Transition value
-     * @param rule - Rule object from Rule array from this._parsedXml
-     * @return - Contains error if parsing failed, otherwise contains
-     * the parsed transition array
-     *
-     * Format of result:
-     * result = {
-     *      error: <error>,
-     *      transition: [
-     *          {
-     *              days: <days>,
-     *              date: <date>,
-     *              storageClass: <storage-class>,
-     *          },
-     *          ...
-     *      ]
-     * }
-     */
-    _parseTransition(rule: {
-        Transition: any[];
-        Prefix?: string[];
-        Filter?: any;
-    }) {
-        const transition:
-            ({ days: number; storageClass: string }
-            | { date: string; storageClass: string })[] = [];
-        const usedStorageClasses: string[] = [];
-        let usedTimeType: string | null = null;
-        for (let i = 0; i < rule.Transition.length; i++) {
-            const t = rule.Transition[i]; // Transition object
-            const days = t.Days && Number.parseInt(t.Days[0], 10);
-            const date = t.Date && t.Date[0];
-            const storageClass = t.StorageClass && t.StorageClass[0];
-            if ((days === undefined && date === undefined) ||
-                (days !== undefined && date !== undefined) ||
-                (storageClass === undefined)) {
-                return { error: errors.MalformedXML };
-            }
-            let error = this._checkStorageClasses({
-                storageClass,
-                usedStorageClasses,
-                ancestor: 'Transition',
-                rule,
-            });
-            if (error) {
-                return { error };
-            }
-            usedStorageClasses.push(storageClass);
-            if (days !== undefined) {
-                error = this._checkTimeType({
-                    usedTimeType,
-                    currentTimeType: 'Days',
-                    rule,
-                });
-                if (error) {
-                    return { error };
-                }
-                usedTimeType = 'Days';
-                error = this._checkDays({
-                    days,
-                    field: 'Days',
-                    ancestor: 'Transition',
-                });
-                if (error) {
-                    return { error };
-                }
-                transition.push({ days, storageClass });
-            }
-            if (date !== undefined) {
-                error = this._checkTimeType({
-                    usedTimeType,
-                    currentTimeType: 'Date',
-                    rule,
-                });
-                if (error) {
-                    return { error };
-                }
-                usedTimeType = 'Date';
-                error = this._checkDate(date);
-                if (error) {
-                    return { error };
-                }
-                transition.push({ date, storageClass });
-            }
-            error = this._checkTimeGap({ days, date, storageClass, rule });
-            if (error) {
-                return { error };
-            }
-        }
-        return { transition };
-    }
-
    /**
     * Check that action component of rule is valid
     * @param rule - a rule object from Rule array from this._parsedXml
@ -889,13 +528,8 @@ export default class LifecycleConfiguration {
            propName: 'actions',
            actions: [],
        };
-        const validActions = [
-            'AbortIncompleteMultipartUpload',
-            'Expiration',
-            'NoncurrentVersionExpiration',
-            'NoncurrentVersionTransition',
-            'Transition',
-        ];
+        const validActions = ['AbortIncompleteMultipartUpload',
+            'Expiration', 'NoncurrentVersionExpiration'];
        validActions.forEach(a => {
            if (rule[a]) {
                actionsObj.actions.push({ actionName: `${a}` });
@ -912,14 +546,7 @@ export default class LifecycleConfiguration {
            if (action.error) {
                actionsObj.error = action.error;
            } else {
-                const actionTimes = [
-                    'days',
-                    'date',
-                    'deleteMarker',
-                    'transition',
-                    'nonCurrentVersionTransition',
-                    'newerNoncurrentVersions'
-                ];
+                const actionTimes = ['days', 'date', 'deleteMarker', 'newerNoncurrentVersions'];
                actionTimes.forEach(t => {
                    if (action[t]) {
                        // eslint-disable-next-line no-param-reassign
@ -1013,9 +640,12 @@ export default class LifecycleConfiguration {
            return { error };
        }
        if (subExp.Date) {
-            const error = this._checkDate(subExp.Date[0]);
-            if (error) {
-                expObj.error = error;
+            const isoRegex = new RegExp('^(-?(?:[1-9][0-9]*)?[0-9]{4})-' +
+                '(1[0-2]|0[1-9])-(3[01]|0[1-9]|[12][0-9])T(2[0-3]|[01][0-9])' +
+                ':([0-5][0-9]):([0-5][0-9])(.[0-9]+)?(Z)?$');
+            if (!isoRegex.test(subExp.Date[0])) {
+                expObj.error = errors.InvalidArgument.customizeDescription(
+                    'Date must be in ISO 8601 format');
            } else {
                expObj.date = subExp.Date[0];
            }
@ -1153,26 +783,6 @@ export default class LifecycleConfiguration {
                if (a.deleteMarker) {
                    assert.strictEqual(typeof a.deleteMarker, 'string');
                }
-                if (a.nonCurrentVersionTransition) {
-                    assert.strictEqual(
-                        typeof a.nonCurrentVersionTransition, 'object');
-                    a.nonCurrentVersionTransition.forEach(t => {
-                        assert.strictEqual(typeof t.noncurrentDays, 'number');
-                        assert.strictEqual(typeof t.storageClass, 'string');
-                    });
-                }
-                if (a.transition) {
-                    assert.strictEqual(typeof a.transition, 'object');
-                    a.transition.forEach(t => {
-                        if (t.days || t.days === 0) {
-                            assert.strictEqual(typeof t.days, 'number');
-                        }
-                        if (t.date !== undefined) {
-                            assert.strictEqual(typeof t.date, 'string');
-                        }
-                        assert.strictEqual(typeof t.storageClass, 'string');
-                    });
-                }

                if (a.newerNoncurrentVersions) {
                    assert.strictEqual(typeof a.newerNoncurrentVersions, 'number');
@ -1226,15 +836,7 @@ export default class LifecycleConfiguration {
            }

            const Actions = actions.map(action => {
-                const {
-                    actionName,
-                    days,
-                    date,
-                    deleteMarker,
-                    nonCurrentVersionTransition,
-                    transition,
-                    newerNoncurrentVersions,
-                } = action;
+                const { actionName, days, date, deleteMarker, newerNoncurrentVersions } = action;
                let Action: any;
                if (actionName === 'AbortIncompleteMultipartUpload') {
                    Action = `<${actionName}><DaysAfterInitiation>${days}` +
@ -1253,40 +855,6 @@ export default class LifecycleConfiguration {
                    Action = `<${actionName}>${Days}${Date}${DelMarker}` +
                        `</${actionName}>`;
                }
-                if (actionName === 'NoncurrentVersionTransition') {
-                    const xml: string[] = [];
-                    nonCurrentVersionTransition!.forEach(transition => {
-                        const { noncurrentDays, storageClass } = transition;
-                        xml.push(
-                            `<${actionName}>`,
-                            `<NoncurrentDays>${noncurrentDays}` +
-                                '</NoncurrentDays>',
-                            `<StorageClass>${storageClass}</StorageClass>`,
-                            `</${actionName}>`,
-                        );
-                    });
-                    Action = xml.join('');
-                }
-                if (actionName === 'Transition') {
-                    const xml: string[] = [];
-                    transition!.forEach(transition => {
-                        const { days, date, storageClass } = transition;
-                        let element: string = '';
-                        if (days !== undefined) {
-                            element = `<Days>${days}</Days>`;
-                        }
-                        if (date !== undefined) {
-                            element = `<Date>${date}</Date>`;
-                        }
-                        xml.push(
-                            `<${actionName}>`,
-                            element,
-                            `<StorageClass>${storageClass}</StorageClass>`,
-                            `</${actionName}>`,
-                        );
-                    });
-                    Action = xml.join('');
-                }
                return Action;
            }).join('');
            return `<Rule>${ID}${Status}${Filter}${Actions}</Rule>`;
@ -1369,15 +937,6 @@ export type Rule = {
        date?: number;
        deleteMarker?: boolean;
        newerNoncurrentVersions?: number;
-        nonCurrentVersionTransition?: {
-            noncurrentDays: number;
-            storageClass: string;
-        }[];
-        transition?: {
-            days?: number;
-            date?: string;
-            storageClass: string;
-        }[];
    }[];
    filter?: {
        rulePrefix?: string;
--- a/lib/models/LifecycleRule.ts
+++ b/lib/models/LifecycleRule.ts
@ -28,7 +28,6 @@ export default class LifecycleRule {
    ncvExpiration?: NoncurrentExpiration;
    abortMPU?: { DaysAfterInitiation: number };
    transitions?: any[];
-    ncvTransitions?: any[];
    prefix?: string;

    constructor(id: string, status: Status) {
@ -46,7 +45,6 @@ export default class LifecycleRule {
            NoncurrentVersionExpiration?: NoncurrentExpiration;
            AbortIncompleteMultipartUpload?: { DaysAfterInitiation: number };
            Transitions?: any[];
-            NoncurrentVersionTransitions?: any[];
            Filter?: Filter;
            Prefix?: '';
        } = { ID: this.id, Status: this.status };
@ -63,9 +61,6 @@ export default class LifecycleRule {
        if (this.transitions) {
            rule.Transitions = this.transitions;
        }
-        if (this.ncvTransitions) {
-            rule.NoncurrentVersionTransitions = this.ncvTransitions;
-        }

        const filter = this.buildFilter();

@ -178,13 +173,4 @@ export default class LifecycleRule {
        this.transitions = transitions;
        return this;
    }
-
-    /**
-     * NonCurrentVersionTransitions
-     * @param nvcTransitions - NonCurrentVersionTransitions 
-     */
-    addNCVTransitions(nvcTransitions) {
-        this.ncvTransitions = nvcTransitions;
-        return this;
-    }
 }
--- a/lib/models/ObjectMD.ts
+++ b/lib/models/ObjectMD.ts
@ -1,13 +1,9 @@
-import * as crypto from 'crypto';
 import * as constants from '../constants';
 import * as VersionIDUtils from '../versioning/VersionID';
-import { VersioningConstants } from '../versioning/constants';
 import ObjectMDLocation, {
    ObjectMDLocationData,
    Location,
 } from './ObjectMDLocation';
-import ObjectMDAmzRestore from './ObjectMDAmzRestore';
-import ObjectMDArchive from './ObjectMDArchive';

 export type ACL = {
    Canned: string;
@ -32,7 +28,6 @@ export type ReplicationInfo = {
    role: string;
    storageType: string;
    dataStoreVersionId: string;
-    isNFS: boolean | null;
 };

 export type ObjectMDData = {
@ -40,26 +35,24 @@ export type ObjectMDData = {
    'owner-id': string;
    'cache-control': string;
    'content-disposition': string;
-    'content-language': string;
    'content-encoding': string;
-    'creation-time'?: string;
    'last-modified'?: string;
    expires: string;
    'content-length': number;
    'content-type': string;
    'content-md5': string;
+    // simple/no version. will expand once object versioning is
+    // introduced
    'x-amz-version-id': 'null' | string;
    'x-amz-server-version-id': string;
-    'x-amz-restore'?: ObjectMDAmzRestore;
-    archive?: ObjectMDArchive;
+    // TODO: Handle this as a utility function for all object puts
+    // similar to normalizing request but after checkAuth so
+    // string to sign is not impacted.  This is GH Issue#89.
    'x-amz-storage-class': string;
    'x-amz-server-side-encryption': string;
    'x-amz-server-side-encryption-aws-kms-key-id': string;
    'x-amz-server-side-encryption-customer-algorithm': string;
    'x-amz-website-redirect-location': string;
-    'x-amz-scal-transition-in-progress'?: boolean;
-    'x-amz-scal-transition-time'?: string;
-    azureInfo?: any;
    acl: ACL;
    key: string;
    location: null | Location[];
@ -79,17 +72,6 @@ export type ObjectMDData = {
    replicationInfo: ReplicationInfo;
    dataStoreName: string;
    originOp: string;
-    microVersionId?: string;
-    // Deletion flag
-    // Used for keeping object metadata in the oplog event
-    // In case of a deletion the flag is first updated before
-    // deleting the object
-    deleted: boolean;
-    // PHD flag indicates whether the object is a temporary placeholder.
-    // This is the case when the latest version of an object gets deleted
-    // the master is set as a placeholder and gets updated with the new latest
-    // version data after a certain amount of time.
-    isPHD: boolean;
 };

 /**
@ -118,17 +100,9 @@ export default class ObjectMD {
            } else {
                this._updateFromParsedJSON(objMd);
            }
-            if (!this._data['creation-time']) {
-                const lastModified = this.getLastModified();
-                if (lastModified) {
-                    this.setCreationTime(lastModified);
-                }
-            }
        } else {
            // set newly-created object md modified time to current time
-            const dt = new Date().toJSON();
-            this.setLastModified(dt);
-            this.setCreationTime(dt);
+            this._data['last-modified'] = new Date().toJSON();
        }
        // set latest md model version now that we ensured
        // backward-compat conversion
@ -183,8 +157,6 @@ export default class ObjectMD {
            'content-length': 0,
            'content-type': '',
            'content-md5': '',
-            'content-language': '',
-            'creation-time': undefined,
            // simple/no version. will expand once object versioning is
            // introduced
            'x-amz-version-id': 'null',
@ -197,7 +169,6 @@ export default class ObjectMD {
            'x-amz-server-side-encryption-aws-kms-key-id': '',
            'x-amz-server-side-encryption-customer-algorithm': '',
            'x-amz-website-redirect-location': '',
-            'x-amz-scal-transition-in-progress': false,
            acl: {
                Canned: 'private',
                FULL_CONTROL: [],
@ -207,7 +178,6 @@ export default class ObjectMD {
            },
            key: '',
            location: null,
-            azureInfo: undefined,
            // versionId, isNull, nullVersionId and isDeleteMarker
            // should be undefined when not set explicitly
            isNull: undefined,
@ -227,12 +197,9 @@ export default class ObjectMD {
                role: '',
                storageType: '',
                dataStoreVersionId: '',
-                isNFS: null,
            },
            dataStoreName: '',
            originOp: '',
-            deleted: false,
-            isPHD: false,
        };
    }

@ -462,50 +429,6 @@ export default class ObjectMD {
        return this._data['content-md5'];
    }

-    /**
-     * Set content-language
-     *
-     * @param contentLanguage - content-language
-     * @return itself
-     */
-    setContentLanguage(contentLanguage: string) {
-        this._data['content-language'] = contentLanguage;
-        return this;
-    }
-
-    /**
-     * Returns content-language
-     *
-     * @return content-language
-     */
-    getContentLanguage() {
-        return this._data['content-language'];
-    }
-
-    /**
-     * Set Creation Date
-     *
-     * @param creationTime - Creation Date
-     * @return itself
-     */
-    setCreationTime(creationTime: string) {
-        this._data['creation-time'] = creationTime;
-        return this;
-    }
-
-    /**
-     * Returns Creation Date
-     *
-     * @return Creation Date
-     */
-    getCreationTime() {
-        // If creation-time is not set fallback to LastModified
-        if (!this._data['creation-time']) {
-            return this.getLastModified();
-        }
-        return this._data['creation-time'];
-    }
-
    /**
     * Set version id
     *
@ -646,48 +569,6 @@ export default class ObjectMD {
        return this._data['x-amz-website-redirect-location'];
    }

-    /**
-     * Set metadata transition in progress value
-     *
-     * @param inProgress - True if transition is in progress, false otherwise
-     * @param transitionTime - Date when the transition started
-     * @return itself
-     */
-    setTransitionInProgress(inProgress: false): this
-    setTransitionInProgress(inProgress: true, transitionTime: Date|string|number): this
-    setTransitionInProgress(inProgress: boolean, transitionTime?: Date|string|number) {
-        this._data['x-amz-scal-transition-in-progress'] = inProgress;
-        if (!inProgress || !transitionTime) {
-            delete this._data['x-amz-scal-transition-time'];
-        } else {
-            if (typeof transitionTime === 'number') {
-                transitionTime = new Date(transitionTime);
-            }
-            if (transitionTime instanceof Date) {
-                transitionTime = transitionTime.toISOString();
-            }
-            this._data['x-amz-scal-transition-time'] = transitionTime;
-        }
-        return this;
-    }
-
-    /**
-     * Get metadata transition in progress value
-     *
-     * @return True if transition is in progress, false otherwise
-     */
-    getTransitionInProgress() {
-        return this._data['x-amz-scal-transition-in-progress'];
-    }
-
-    /**
-     * Gets the transition time of the object.
-     * @returns The transition time of the object.
-     */
-    getTransitionTime() {
-        return this._data['x-amz-scal-transition-time'];
-    }
-
    /**
     * Set access control list
     *
@ -793,29 +674,6 @@ export default class ObjectMD {
        return reducedLocations;
    }

-    /**
-     * Set the Azure specific information
-     * @param azureInfo - a plain JS structure representing the
-     *   Azure specific information for a Blob or a Container (see constructor
-     *   of {@link ObjectMDAzureInfo} for a description of the fields of this
-     *   structure
-     * @return itself
-     */
-    setAzureInfo(azureInfo: any) {
-        this._data.azureInfo = azureInfo;
-        return this;
-    }
-
-    /**
-     * Get the Azure specific information
-     * @return a plain JS structure representing the Azure specific
-     *   information for a Blob or a Container an suitable for the constructor
-     *   of {@link ObjectMDAzureInfo}.
-     */
-    getAzureInfo() {
-        return this._data.azureInfo;
-    }
-
    /**
     * Set metadata isNull value
     *
@ -922,19 +780,6 @@ export default class ObjectMD {
        return this._data.isDeleteMarker || false;
    }

-    /**
-     * Get if the object is a multipart upload (MPU)
-     *
-     * The function checks the "content-md5" field: if it contains a
-     * dash ('-') it is a MPU, as the content-md5 string ends with
-     * "-[nbparts]" for MPUs.
-     *
-     * @return Whether object is a multipart upload
-     */
-    isMultipartUpload() {
-        return this.getContentMd5().includes('-');
-    }
-
    /**
     * Set metadata versionId value
     *
@ -952,9 +797,6 @@ export default class ObjectMD {
     * @return The object versionId
     */
    getVersionId() {
-        if (this.getIsNull()) {
-            return VersioningConstants.ExternalNullVersionId;
-        }
        return this._data.versionId;
    }

@ -962,16 +804,13 @@ export default class ObjectMD {
     * Get metadata versionId value in encoded form (the one visible
     * to the S3 API user)
     *
-     * @return {undefined|string} The encoded object versionId
+     * @return The encoded object versionId
     */
    getEncodedVersionId() {
        const versionId = this.getVersionId();
-        if (versionId === VersioningConstants.ExternalNullVersionId) {
-            return versionId;
-        } else if (versionId) {
+        if (versionId) {
            return VersionIDUtils.encode(versionId);
        }
-        return undefined;
    }

    /**
@ -1014,20 +853,6 @@ export default class ObjectMD {
        return this._data.tags;
    }

-    getUserMetadata() {
-        const metaHeaders = {};
-        const data = this.getValue();
-        Object.keys(data).forEach(key => {
-            if (key.startsWith('x-amz-meta-')) {
-                metaHeaders[key] = data[key];
-            }
-        });
-        if (Object.keys(metaHeaders).length > 0) {
-            return JSON.stringify(metaHeaders);
-        }
-        return undefined;
-    }
-
    /**
     * Set replication information
     *
@ -1043,7 +868,6 @@ export default class ObjectMD {
        role: string;
        storageType?: string;
        dataStoreVersionId?: string;
-        isNFS?: boolean;
    }) {
        const {
            status,
@ -1054,7 +878,6 @@ export default class ObjectMD {
            role,
            storageType,
            dataStoreVersionId,
-            isNFS,
        } = replicationInfo;
        this._data.replicationInfo = {
            status,
@ -1065,7 +888,6 @@ export default class ObjectMD {
            role,
            storageType: storageType || '',
            dataStoreVersionId: dataStoreVersionId || '',
-            isNFS: isNFS || null,
        };
        return this;
    }
@ -1084,24 +906,6 @@ export default class ObjectMD {
        return this;
    }

-    /**
-     * Set whether the replication is occurring from an NFS bucket.
-     * @param isNFS - Whether replication from an NFS bucket
-     * @return itself
-     */
-    setReplicationIsNFS(isNFS: boolean) {
-        this._data.replicationInfo.isNFS = isNFS;
-        return this;
-    }
-
-    /**
-     * Get whether the replication is occurring from an NFS bucket.
-     * @return Whether replication from an NFS bucket
-     */
-    getReplicationIsNFS() {
-        return this._data.replicationInfo.isNFS;
-    }
-
    setReplicationSiteStatus(site: string, status: string) {
        const backend = this._data.replicationInfo.backends.find(
            (o) => o.site === site
@ -1152,11 +956,6 @@ export default class ObjectMD {
        return this;
    }

-    setReplicationStorageType(storageType: string) {
-        this._data.replicationInfo.storageType = storageType;
-        return this;
-    }
-
    setReplicationStorageClass(storageClass: string) {
        this._data.replicationInfo.storageClass = storageClass;
        return this;
@ -1238,9 +1037,6 @@ export default class ObjectMD {
        Object.keys(metaHeaders).forEach((key) => {
            if (key.startsWith('x-amz-meta-')) {
                this._data[key] = metaHeaders[key];
-            } else if (key.startsWith('x-ms-meta-')) {
-                const _key = key.replace('x-ms-meta-', 'x-amz-meta-');
-                this._data[_key] = metaHeaders[key];
            }
        });
        // If a multipart object and the acl is already parsed, we update it
@ -1250,20 +1046,6 @@ export default class ObjectMD {
        return this;
    }

-    /**
-     * Clear all existing meta headers (used for Azure)
-     *
-     * @return itself
-     */
-    clearMetadataValues() {
-        Object.keys(this._data).forEach(key => {
-            if (key.startsWith('x-amz-meta')) {
-                delete this._data[key];
-            }
-        });
-        return this;
-    }
-
    /**
     * overrideMetadataValues (used for complete MPU and object copy)
     *
@ -1275,38 +1057,6 @@ export default class ObjectMD {
        return this;
    }

-    /**
-     * Create or update the microVersionId field
-     *
-     * This field can be used to force an update in MongoDB. This can
-     * be needed in the following cases:
-     *
-     * - in case no other metadata field changes
-     *
-     * - to detect a change when fields change but object version does
-     *   not change e.g. when ingesting a putObjectTagging coming from
-     *   S3C to Zenko
-     *
-     * - to manage conflicts during concurrent updates, using
-     *   conditions on the microVersionId field.
-     *
-     * It's a field of 16 hexadecimal characters randomly generated
-     *
-     * @return itself
-     */
-    updateMicroVersionId() {
-        this._data.microVersionId = crypto.randomBytes(8).toString('hex');
-    }
-
-    /**
-     * Get the microVersionId field, or null if not set
-     *
-     * @return the microVersionId field if exists, or {null} if it does not exist
-     */
-    getMicroVersionId() {
-        return this._data.microVersionId || null;
-    }
-
    /**
     * Set object legal hold status
     * @param legalHold - true if legal hold is 'ON' false if 'OFF'
@ -1387,98 +1137,4 @@ export default class ObjectMD {
    getValue() {
        return this._data;
    }
-
-    /**
-     * Get x-amz-restore
-     *
-     * @returns x-amz-restore
-     */
-    getAmzRestore() {
-        return this._data['x-amz-restore'];
-    }
-
-    /**
-     * Set x-amz-restore
-     *
-     * @param value x-amz-restore object
-     * @returns itself
-     * @throws case of invalid parameter
-     */
-    setAmzRestore(value?: ObjectMDAmzRestore) {
-        if (value) {
-            // Accept object instance of ObjectMDAmzRestore and Object
-            if (!(value instanceof ObjectMDAmzRestore) && !ObjectMDAmzRestore.isValid(value)) {
-                throw new Error('x-amz-restore must be type of ObjectMDAmzRestore.');
-            }
-            this._data['x-amz-restore'] = value;
-        } else {
-            delete this._data['x-amz-restore'];
-        }
-        return this;
-    }
-
-    /**
-     * Get archive
-     *
-     * @returns archive
-     */
-    getArchive() {
-        return this._data.archive;
-    }
-
-    /**
-     * Set archive
-     *
-     * @param value archive object
-     * @returns itself
-     * @throws case of invalid parameter
-     */
-    setArchive(value: ObjectMDArchive) {
-        if (value) {
-            // Accept object instance of ObjectMDArchive and Object
-            if (!(value instanceof ObjectMDArchive) && !ObjectMDArchive.isValid(value)) {
-                throw new Error('archive is must be type of ObjectMDArchive.');
-            }
-            this._data.archive = value;
-        } else {
-            delete this._data.archive;
-        }
-        return this;
-    }
-
-    /**
-    * Set deleted flag
-    * @param {Boolean} value deleted object
-    * @return {ObjectMD}
-    */
-     setDeleted(value) {
-        this._data.deleted = value;
-        return this;
-    }
-    
-    /**
-    * Get deleted flag
-    * @return {Boolean}
-    */
-    getDeleted() {
-        return this._data.deleted;
-    }
-
-    /**
-    * Set isPHD flag
-    * @param {Boolean} value isPHD value
-    * @return {ObjectMD}
-    */
-    setIsPHD(value) {
-        this._data.isPHD = value;
-        return this;
-    }
-
-    /**
-    * Get isPHD flag
-    * @return {Boolean}
-    */
-    getIsPHD() {
-        return this._data.isPHD;
-    }
 }
--- a/lib/models/ObjectMDAmzRestore.ts
+++ b/lib/models/ObjectMDAmzRestore.ts
@ -1,94 +0,0 @@
-/*
- * Code based on Yutaka Oishi (Fujifilm) contributions
- * Date: 11 Sep 2020
- */
-
-/**
- * class representing the x-amz-restore of object metadata.
- *
- * @class
- */
-export default class ObjectMDAmzRestore {
-    'expiry-date': Date | string;
-    'ongoing-request': boolean;
-
-    /**
-     *
-     * @constructor
-     * @param ongoingRequest ongoing-request
-     * @param [expiryDate] expiry-date
-     * @throws case of invalid parameter
-     */
-    constructor(ongoingRequest: boolean, expiryDate?: Date | string) {
-        this.setOngoingRequest(ongoingRequest);
-        this.setExpiryDate(expiryDate);
-    }
-
-    /**
-     *
-     * @param data archiveInfo
-     * @returns true if the provided object is valid
-     */
-    static isValid(data: { 'ongoing-request': boolean; 'expiry-date': Date | string }) {
-        try {
-            // eslint-disable-next-line no-new
-            new ObjectMDAmzRestore(data['ongoing-request'], data['expiry-date']);
-            return true;
-        } catch (err) {
-            return false;
-        }
-    }
-
-    /**
-     *
-     * @returns ongoing-request
-     */
-    getOngoingRequest() {
-        return this['ongoing-request'];
-    }
-
-    /**
-     *
-     * @param value ongoing-request
-     * @throws case of invalid parameter
-     */
-    setOngoingRequest(value?: boolean) {
-        if (value === undefined) {
-            throw new Error('ongoing-request is required.');
-        } else if (typeof value !== 'boolean') {
-            throw new Error('ongoing-request must be type of boolean.');
-        }
-        this['ongoing-request'] = value;
-    }
-
-    /**
-     *
-     * @returns expiry-date
-     */
-    getExpiryDate() {
-        return this['expiry-date'];
-    }
-
-    /**
-     *
-     * @param value expiry-date
-     * @throws case of invalid parameter
-     */
-    setExpiryDate(value?: Date | string) {
-        if (value) {
-            const checkWith = (new Date(value)).getTime();
-            if (Number.isNaN(Number(checkWith))) {
-                throw new Error('expiry-date is must be a valid Date.');
-            }
-            this['expiry-date'] = value;
-        }
-    }
-
-    /**
-     *
-     * @returns itself
-     */
-    getValue() {
-        return this;
-    }
-}
--- a/lib/models/ObjectMDArchive.ts
+++ b/lib/models/ObjectMDArchive.ts
@ -1,184 +0,0 @@
-/**
- * class representing the archive of object metadata.
- *
- * @class
- */
-export default class ObjectMDArchive {
-    archiveInfo: any;
-    // @ts-ignore
-    restoreRequestedAt: Date | string;
-    // @ts-ignore
-    restoreRequestedDays: number;
-    // @ts-ignore
-    restoreCompletedAt: Date | string;
-    // @ts-ignore
-    restoreWillExpireAt: Date | string;
-
-    /**
-     *
-     * @constructor
-     * @param archiveInfo contains the archive info set by the TLP and returned by the TLP jobs
-     * @param [restoreRequestedAt] set at the time restore request is made by the client
-     * @param [restoreRequestedDays] set at the time restore request is made by the client
-     * @param [restoreCompletedAt] set at the time of successful restore
-     * @param [restoreWillExpireAt] computed and stored at the time of restore
-     * @throws case of invalid parameter
-     */
-    constructor(
-        archiveInfo: any,
-        restoreRequestedAt?: Date | string,
-        restoreRequestedDays?: number,
-        restoreCompletedAt?: Date | string,
-        restoreWillExpireAt?: Date | string,
-    ) {
-        this.setArchiveInfo(archiveInfo);
-        this.setRestoreRequestedAt(restoreRequestedAt!);
-        this.setRestoreRequestedDays(restoreRequestedDays!);
-        this.setRestoreCompletedAt(restoreCompletedAt!);
-        this.setRestoreWillExpireAt(restoreWillExpireAt!);
-    }
-
-    /**
-     *
-     * @param data archiveInfo
-     * @returns true if the provided object is valid
-     */
-    static isValid(data: {
-        archiveInfo: any;
-        restoreRequestedAt?: Date;
-        restoreRequestedDays?: number;
-        restoreCompletedAt?: Date;
-        restoreWillExpireAt?: Date;
-    }) {
-        try {
-            // eslint-disable-next-line no-new
-            new ObjectMDArchive(
-                data.archiveInfo,
-                data.restoreRequestedAt,
-                data.restoreRequestedDays,
-                data.restoreCompletedAt,
-                data.restoreWillExpireAt,
-            );
-            return true;
-        } catch (err) {
-            return false;
-        }
-    }
-
-    /**
-     *
-     * @returns archiveInfo
-     */
-    getArchiveInfo() {
-        return this.archiveInfo;
-    }
-
-    /**
-     * @param value archiveInfo
-     * @throws case of invalid parameter
-     */
-    setArchiveInfo(value: any) {
-        if (!value) {
-            throw new Error('archiveInfo is required.');
-        } else if (typeof value !== 'object') {
-            throw new Error('archiveInfo must be type of object.');
-        }
-        this.archiveInfo = value;
-    }
-
-    /**
-     *
-     * @returns restoreRequestedAt
-     */
-    getRestoreRequestedAt() {
-        return this.restoreRequestedAt;
-    }
-    /**
-     * @param value restoreRequestedAt
-     * @throws case of invalid parameter
-     */
-    setRestoreRequestedAt(value: Date | string) {
-        if (value) {
-            const checkWith = (new Date(value)).getTime();
-            if (Number.isNaN(Number(checkWith))) {
-                throw new Error('restoreRequestedAt must be a valid Date.');
-            }
-            this.restoreRequestedAt = value;
-        }
-    }
-
-    /**
-     *
-     * @returns restoreRequestedDays
-     */
-    getRestoreRequestedDays() {
-        return this.restoreRequestedDays;
-    }
-    /**
-     * @param value restoreRequestedDays
-     * @throws case of invalid parameter
-     */
-    setRestoreRequestedDays(value: number) {
-        if (value) {
-            if (isNaN(value)) {
-                throw new Error('restoreRequestedDays must be type of Number.');
-            }
-            this.restoreRequestedDays = value;
-        }
-    }
-
-    /**
-     *
-     * @returns restoreCompletedAt
-     */
-    getRestoreCompletedAt() {
-        return this.restoreCompletedAt;
-    }
-    /**
-     * @param value restoreCompletedAt
-     * @throws case of invalid parameter
-     */
-    setRestoreCompletedAt(value: Date | string) {
-        if (value) {
-            if (!this.restoreRequestedAt || !this.restoreRequestedDays) {
-                throw new Error('restoreCompletedAt must be set after restoreRequestedAt and restoreRequestedDays.');
-            }
-            const checkWith = (new Date(value)).getTime();
-            if (Number.isNaN(Number(checkWith))) {
-                throw new Error('restoreCompletedAt must be a valid Date.');
-            }
-            this.restoreCompletedAt = value;
-        }
-    }
-    /**
-     *
-     * @returns restoreWillExpireAt
-     */
-    getRestoreWillExpireAt() {
-        return this.restoreWillExpireAt;
-    }
-    /**
-     * @param value restoreWillExpireAt
-     * @throws case of invalid parameter
-     */
-    setRestoreWillExpireAt(value: Date | string) {
-        if (value) {
-            if (!this.restoreRequestedAt || !this.restoreRequestedDays) {
-                throw new Error('restoreWillExpireAt must be set after restoreRequestedAt and restoreRequestedDays.');
-            }
-            const checkWith = (new Date(value)).getTime();
-            if (Number.isNaN(Number(checkWith))) {
-                throw new Error('restoreWillExpireAt must be a valid Date.');
-            }
-            this.restoreWillExpireAt = value;
-        }
-    }
-
-    /**
-     *
-     * @returns itself
-     */
-    getValue() {
-        return this;
-    }
-}
--- a/lib/models/ObjectMDAzureInfo.ts
+++ b/lib/models/ObjectMDAzureInfo.ts
@ -1,188 +0,0 @@
-/**
- * Helper class to ease access to the Azure specific information for
- * Blob and Container objects.
- */
-export default class ObjectMDAzureInfo {
-    _data: {
-        containerPublicAccess: string;
-        containerStoredAccessPolicies: any[];
-        containerImmutabilityPolicy: any;
-        containerLegalHoldStatus: boolean;
-        containerDeletionInProgress: boolean;
-        blobType: string;
-        blobContentMD5: string;
-        blobIssuedETag: string;
-        blobCopyInfo: any;
-        blobSequenceNumber: number;
-        blobAccessTierChangeTime: Date;
-        blobUncommitted: boolean;
-    };
-
-    /**
-     * @constructor
-     * @param obj - Raw structure for the Azure info on Blob/Container
-     * @param obj.containerPublicAccess - Public access authorization
-     *   type
-     * @param obj.containerStoredAccessPolicies - Access policies
-     *   for Shared Access Signature bearer
-     * @param obj.containerImmutabilityPolicy - data immutability
-     *   policy for this container
-     * @param obj.containerLegalHoldStatus - legal hold status for
-     *   this container
-     * @param obj.containerDeletionInProgress - deletion in progress
-     *   indicator for this container
-     * @param obj.blobType - defines the type of blob for this object
-     * @param obj.blobContentMD5 - whole object MD5 sum set by the
-     *   client through the Azure API
-     * @param obj.blobIssuedETag - backup of the issued ETag on MD only
-     *   operations like Set Blob Properties and Set Blob Metadata
-     * @param obj.blobCopyInfo - information pertaining to past and
-     *   pending copy operation targeting this object
-     * @param obj.blobSequenceNumber - sequence number for a PageBlob
-     * @param obj.blobAccessTierChangeTime - date of change of tier
-     * @param obj.blobUncommitted - A block has been put for a
-     *   nonexistent blob which is about to be created
-     */
-    constructor(obj: {
-        containerPublicAccess: string;
-        containerStoredAccessPolicies: any[];
-        containerImmutabilityPolicy: any;
-        containerLegalHoldStatus: boolean;
-        containerDeletionInProgress: boolean;
-        blobType: string;
-        blobContentMD5: string;
-        blobIssuedETag: string;
-        blobCopyInfo: any;
-        blobSequenceNumber: number;
-        blobAccessTierChangeTime: Date;
-        blobUncommitted: boolean;
-    }) {
-        this._data = {
-            containerPublicAccess: obj.containerPublicAccess,
-            containerStoredAccessPolicies: obj.containerStoredAccessPolicies,
-            containerImmutabilityPolicy: obj.containerImmutabilityPolicy,
-            containerLegalHoldStatus: obj.containerLegalHoldStatus,
-            containerDeletionInProgress: obj.containerDeletionInProgress,
-            blobType: obj.blobType,
-            blobContentMD5: obj.blobContentMD5,
-            blobIssuedETag: obj.blobIssuedETag,
-            blobCopyInfo: obj.blobCopyInfo,
-            blobSequenceNumber: obj.blobSequenceNumber,
-            blobAccessTierChangeTime: obj.blobAccessTierChangeTime,
-            blobUncommitted: obj.blobUncommitted,
-        };
-    }
-
-    getContainerPublicAccess() {
-        return this._data.containerPublicAccess;
-    }
-
-    setContainerPublicAccess(containerPublicAccess: string) {
-        this._data.containerPublicAccess = containerPublicAccess;
-        return this;
-    }
-
-    getContainerStoredAccessPolicies() {
-        return this._data.containerStoredAccessPolicies;
-    }
-
-    setContainerStoredAccessPolicies(containerStoredAccessPolicies: any[]) {
-        this._data.containerStoredAccessPolicies =
-            containerStoredAccessPolicies;
-        return this;
-    }
-
-    getContainerImmutabilityPolicy() {
-        return this._data.containerImmutabilityPolicy;
-    }
-
-    setContainerImmutabilityPolicy(containerImmutabilityPolicy: any) {
-        this._data.containerImmutabilityPolicy = containerImmutabilityPolicy;
-        return this;
-    }
-
-    getContainerLegalHoldStatus() {
-        return this._data.containerLegalHoldStatus;
-    }
-
-    setContainerLegalHoldStatus(containerLegalHoldStatus: boolean) {
-        this._data.containerLegalHoldStatus = containerLegalHoldStatus;
-        return this;
-    }
-
-    getContainerDeletionInProgress() {
-        return this._data.containerDeletionInProgress;
-    }
-
-    setContainerDeletionInProgress(containerDeletionInProgress: boolean) {
-        this._data.containerDeletionInProgress = containerDeletionInProgress;
-        return this;
-    }
-
-    getBlobType() {
-        return this._data.blobType;
-    }
-
-    setBlobType(blobType: string) {
-        this._data.blobType = blobType;
-        return this;
-    }
-
-    getBlobContentMD5() {
-        return this._data.blobContentMD5;
-    }
-
-    setBlobContentMD5(blobContentMD5: string) {
-        this._data.blobContentMD5 = blobContentMD5;
-        return this;
-    }
-
-    getBlobIssuedETag() {
-        return this._data.blobIssuedETag;
-    }
-
-    setBlobIssuedETag(blobIssuedETag: string) {
-        this._data.blobIssuedETag = blobIssuedETag;
-        return this;
-    }
-
-    getBlobCopyInfo() {
-        return this._data.blobCopyInfo;
-    }
-
-    setBlobCopyInfo(blobCopyInfo: any) {
-        this._data.blobCopyInfo = blobCopyInfo;
-        return this;
-    }
-
-    getBlobSequenceNumber() {
-        return this._data.blobSequenceNumber;
-    }
-
-    setBlobSequenceNumber(blobSequenceNumber: number) {
-        this._data.blobSequenceNumber = blobSequenceNumber;
-        return this;
-    }
-
-    getBlobAccessTierChangeTime() {
-        return this._data.blobAccessTierChangeTime;
-    }
-
-    setBlobAccessTierChangeTime(blobAccessTierChangeTime: Date) {
-        this._data.blobAccessTierChangeTime = blobAccessTierChangeTime;
-        return this;
-    }
-
-    getBlobUncommitted() {
-        return this._data.blobUncommitted;
-    }
-
-    setBlobUncommitted(blobUncommitted: boolean) {
-        this._data.blobUncommitted = blobUncommitted;
-        return this;
-    }
-
-    getValue() {
-        return this._data;
-    }
-}
--- a/lib/models/ObjectMDLocation.ts
+++ b/lib/models/ObjectMDLocation.ts
@ -5,7 +5,6 @@ export type Location = BaseLocation & {
    size: number;
    dataStoreETag: string;
    dataStoreVersionId: string;
-    blockId?: string;
 };
 export type ObjectMDLocationData = {
    key: string;
@ -13,8 +12,6 @@ export type ObjectMDLocationData = {
    size: number;
    dataStoreName: string;
    dataStoreETag: string;
-    dataStoreVersionId: string;
-    blockId?: string;
    cryptoScheme?: number;
    cipheredDataKey?: string;
 };
@ -34,14 +31,10 @@ export default class ObjectMDLocation {
     * @param locationObj.dataStoreName - type of data store
     * @param locationObj.dataStoreETag - internal ETag of
     *   data part
-     * @param [locationObj.dataStoreVersionId] - versionId,
-     *   needed for cloud backends
     * @param [location.cryptoScheme] - if location data is
     * encrypted: the encryption scheme version
     * @param [location.cipheredDataKey] - if location data
     * is encrypted: the base64-encoded ciphered data key
-     * @param [locationObj.blockId] - blockId of the part,
-     *   set by the Azure Blob Service REST API frontend
     */
    constructor(locationObj: Location | (Location & Ciphered)) {
        this._data = {
@ -50,8 +43,6 @@ export default class ObjectMDLocation {
            size: locationObj.size,
            dataStoreName: locationObj.dataStoreName,
            dataStoreETag: locationObj.dataStoreETag,
-            dataStoreVersionId: locationObj.dataStoreVersionId,
-            blockId: locationObj.blockId,
        };
        if ('cryptoScheme' in locationObj) {
            this._data.cryptoScheme = locationObj.cryptoScheme;
@ -73,7 +64,6 @@ export default class ObjectMDLocation {
     * @param location - single data location info
     * @param location.key - data backend key
     * @param location.dataStoreName - type of data store
-     * @param [location.dataStoreVersionId] - data backend version ID
     * @param [location.cryptoScheme] - if location data is
     * encrypted: the encryption scheme version
     * @param [location.cipheredDataKey] - if location data
@ -81,19 +71,15 @@ export default class ObjectMDLocation {
     * @return return this
     */
    setDataLocation(location: BaseLocation | (BaseLocation & Ciphered)) {
-        [
-            'key',
-            'dataStoreName',
-            'dataStoreVersionId',
-            'cryptoScheme',
-            'cipheredDataKey',
-        ].forEach(attrName => {
-            if (location[attrName] !== undefined) {
-                this._data[attrName] = location[attrName];
-            } else {
-                delete this._data[attrName];
+        ['key', 'dataStoreName', 'cryptoScheme', 'cipheredDataKey'].forEach(
+            (attrName) => {
+                if (location[attrName] !== undefined) {
+                    this._data[attrName] = location[attrName];
+                } else {
+                    delete this._data[attrName];
+                }
            }
-        });
+        );
        return this;
    }

@ -101,10 +87,6 @@ export default class ObjectMDLocation {
        return this._data.dataStoreETag;
    }

-    getDataStoreVersionId() {
-        return this._data.dataStoreVersionId;
-    }
-
    getPartNumber() {
        return Number.parseInt(this._data.dataStoreETag.split(':')[0], 10);
    }
@ -139,15 +121,6 @@ export default class ObjectMDLocation {
        return this._data.cipheredDataKey;
    }

-    getBlockId() {
-        return this._data.blockId;
-    }
-
-    setBlockId(blockId: string) {
-        this._data.blockId = blockId;
-        return this;
-    }
-
    getValue() {
        return this._data;
    }
--- a/lib/models/ReplicationConfiguration.ts
+++ b/lib/models/ReplicationConfiguration.ts
@ -1,8 +1,6 @@
 import assert from 'assert';
 import UUID from 'uuid';

-import { RequestLogger } from 'werelogs';
-
 import escapeForXml from '../s3middleware/escapeForXml';
 import errors from '../errors';
 import { isValidBucketName } from '../s3routes/routesUtils';
@ -64,8 +62,7 @@ export default class ReplicationConfiguration {
    _destination: string | null;
    _rules: Rule[] | null;
    _prevStorageClass: null;
-    _hasScalityDestination: boolean | null;
-    _preferredReadLocation: string | null;
+    _hasScalityDestination: boolean;

    /**
     * Create a ReplicationConfiguration instance
@ -87,8 +84,7 @@ export default class ReplicationConfiguration {
        this._destination = null;
        this._rules = null;
        this._prevStorageClass = null;
-        this._hasScalityDestination = null;
-        this._preferredReadLocation = null;
+        this._hasScalityDestination = false;
    }

    /**
@ -115,18 +111,6 @@ export default class ReplicationConfiguration {
        return this._rules;
    }

-    /**
-     * The preferred read location
-     * @return {string|null} - The preferred read location if defined,
-     * otherwise null
-     *
-     * FIXME ideally we should be able to specify one preferred read
-     * location for each rule
-     */
-    getPreferredReadLocation() {
-        return this._preferredReadLocation;
-    }
-
    /**
     * Get the replication configuration
     * @return - The replication configuration
@ -136,7 +120,6 @@ export default class ReplicationConfiguration {
            role: this.getRole(),
            destination: this.getDestination(),
            rules: this.getRules(),
-            preferredReadLocation: this.getPreferredReadLocation(),
        };
    }

@ -343,15 +326,7 @@ export default class ReplicationConfiguration {
            return undefined;
        }
        const storageClasses = destination.StorageClass[0].split(',');
-        const prefReadIndex = storageClasses.findIndex(storageClass =>
-            storageClass.endsWith(':preferred_read'));
-        if (prefReadIndex !== -1) {
-            const prefRead = storageClasses[prefReadIndex].split(':')[0];
-            // remove :preferred_read tag from storage class name
-            storageClasses[prefReadIndex] = prefRead;
-            this._preferredReadLocation = prefRead;
-        }
-        const isValidStorageClass = storageClasses.every(storageClass => {
+        const isValidStorageClass = storageClasses.every((storageClass) => {
            if (validStorageClasses.includes(storageClass)) {
                this._hasScalityDestination =
                    defaultEndpoint.type === undefined;
@ -361,11 +336,6 @@ export default class ReplicationConfiguration {
                (endpoint: any) => endpoint.site === storageClass
            );
            if (endpoint) {
-                // We do not support replication to cold location. 
-                // Only transition to cold location is supported.
-                if (endpoint.site && this._config.locationConstraints[endpoint.site]?.isCold) {
-                    return false;
-                }
                // If this._hasScalityDestination was not set to true in any
                // previous iteration or by a prior rule's storage class, then
                // check if the current endpoint is a Scality destination.
--- a/lib/models/index.ts
+++ b/lib/models/index.ts
@ -1,16 +1,11 @@
 export { default as ARN } from './ARN';
-export { default as BackendInfo } from './BackendInfo';
-export { default as BucketAzureInfo } from './BucketAzureInfo';
 export { default as BucketInfo } from './BucketInfo';
-export { default as BucketPolicy } from './BucketPolicy';
+export { default as ObjectMD } from './ObjectMD';
+export { default as ObjectMDLocation } from './ObjectMDLocation';
+export * as WebsiteConfiguration from './WebsiteConfiguration';
+export { default as ReplicationConfiguration } from './ReplicationConfiguration';
 export { default as LifecycleConfiguration } from './LifecycleConfiguration';
 export { default as LifecycleRule } from './LifecycleRule';
-export { default as NotificationConfiguration } from './NotificationConfiguration';
+export { default as BucketPolicy } from './BucketPolicy';
 export { default as ObjectLockConfiguration } from './ObjectLockConfiguration';
-export { default as ObjectMD } from './ObjectMD';
-export { default as ObjectMDAmzRestore } from './ObjectMDAmzRestore';
-export { default as ObjectMDArchive } from './ObjectMDArchive';
-export { default as ObjectMDAzureInfo } from './ObjectMDAzureInfo';
-export { default as ObjectMDLocation } from './ObjectMDLocation';
-export { default as ReplicationConfiguration } from './ReplicationConfiguration';
-export * as WebsiteConfiguration from './WebsiteConfiguration';
+export { default as NotificationConfiguration } from './NotificationConfiguration';
--- a/lib/network/http/server.ts
+++ b/lib/network/http/server.ts
@ -1,6 +1,5 @@
 import * as http from 'http';
 import * as https from 'https';
-import { https as HttpsAgent } from 'httpagent';
 import * as tls from 'tls';
 import * as net from 'net';
 import assert from 'assert';
@ -372,8 +371,6 @@ export default class Server {
            error: err.stack || err,
            address: sock.address(),
        });
-        // socket is not systematically destroyed
-        sock.destroy();
    }

    /**
@ -410,11 +407,7 @@ export default class Server {
                    method: 'arsenal.network.Server.start',
                    port: this._port,
                });
-                this._https.agent = new HttpsAgent.Agent(this._https, {
-                    // Do not enforce the maximum number of sockets for the
-                    // main server, as it might be able to serve more clients.
-                    maxSockets: false,
-                });
+                this._https.agent = new https.Agent(this._https);
                this._server = https.createServer(this._https,
                    (req, res) => this._onRequest(req, res));
            } else {
@ -435,6 +428,7 @@ export default class Server {
            this._server.on('connection', sock => {
                // Setting no delay of the socket to the value configured
                // TODO fix this
+                // @ts-expect-errors
                sock.setNoDelay(this.isNoDelay());
                sock.on('error', err => this._logger.info(
                    'socket error - request rejected', { error: err }));
--- a/lib/network/index.ts
+++ b/lib/network/index.ts
@ -3,12 +3,10 @@ import * as utils from './http/utils';
 import RESTServer from './rest/RESTServer';
 import RESTClient from './rest/RESTClient';
 import * as ProbeServer from './probe/ProbeServer';
-import HealthProbeServer from './probe/HealthProbeServer';
-import * as Utils from './probe/Utils';

 export const http = { server, utils };
 export const rest = { RESTServer, RESTClient };
-export const probe = { ProbeServer, HealthProbeServer, Utils };
+export const probe = { ProbeServer };

 export { default as RoundRobin } from './RoundRobin';
 export { default as kmip } from './kmip';
--- a/lib/network/kmip/codec/ttlv.ts
+++ b/lib/network/kmip/codec/ttlv.ts
@ -20,7 +20,7 @@ function _ttlvPadVector(vec: any[]) {
    return vec;
 }

-function _throwError(logger: werelogs.Logger, msg: string, data?: LogDictionary) {
+function _throwError(logger: werelogs.Logger, msg: string, data?: LogDictionnary) {
    logger.error(msg, data);
    throw Error(msg);
 }
--- a/lib/network/probe/HealthProbeServer.ts
+++ b/lib/network/probe/HealthProbeServer.ts
@ -1,94 +0,0 @@
-import * as http from 'http';
-import httpServer from '../http/server';
-import * as werelogs from 'werelogs';
-import errors from '../../errors';
-import ZenkoMetrics from '../../metrics/ZenkoMetrics';
-import { sendSuccess, sendError } from './Utils';
-
-function checkStub(_log: any) {
-    // eslint-disable-line
-    return true;
-}
-
-export default class HealthProbeServer extends httpServer {
-    logging: werelogs.Logger;
-    _reqHandlers: { [key: string]: any };
-    _livenessCheck: (log: any) => boolean;
-    _readinessCheck: (log: any) => boolean;
-
-    constructor(params: {
-        port: number;
-        bindAddress: string;
-        livenessCheck?: (log: any) => boolean;
-        readinessCheck?: (log: any) => boolean;
-    }) {
-        const logging = new werelogs.Logger('HealthProbeServer');
-        super(params.port, logging);
-        this.logging = logging;
-        this.setBindAddress(params.bindAddress || 'localhost');
-        // hooking our request processing function by calling the
-        // parent's method for that
-        this.onRequest(this._onRequest);
-        this._reqHandlers = {
-            '/_/health/liveness': this._onLiveness.bind(this),
-            '/_/health/readiness': this._onReadiness.bind(this),
-            '/_/monitoring/metrics': this._onMetrics.bind(this),
-        };
-        this._livenessCheck = params.livenessCheck || checkStub;
-        this._readinessCheck = params.readinessCheck || checkStub;
-    }
-
-    onLiveCheck(f: (log: any) => boolean) {
-        this._livenessCheck = f;
-    }
-
-    onReadyCheck(f: (log: any) => boolean) {
-        this._readinessCheck = f;
-    }
-
-    _onRequest(req: http.IncomingMessage, res: http.ServerResponse) {
-        const log = this.logging.newRequestLogger();
-        log.debug('request received', { method: req.method, url: req.url });
-
-        if (req.method !== 'GET') {
-            sendError(res, log, errors.MethodNotAllowed);
-        } else if (req.url && req.url in this._reqHandlers) {
-            this._reqHandlers[req.url](req, res, log);
-        } else {
-            sendError(res, log, errors.InvalidURI);
-        }
-    }
-
-    _onLiveness(
-        _req: http.IncomingMessage,
-        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
-    ) {
-        if (this._livenessCheck(log)) {
-            sendSuccess(res, log);
-        } else {
-            sendError(res, log, errors.ServiceUnavailable);
-        }
-    }
-
-    _onReadiness(
-        _req: http.IncomingMessage,
-        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
-    ) {
-        if (this._readinessCheck(log)) {
-            sendSuccess(res, log);
-        } else {
-            sendError(res, log, errors.ServiceUnavailable);
-        }
-    }
-
-    // expose metrics to Prometheus
-    async _onMetrics(_req: http.IncomingMessage, res: http.ServerResponse) {
-        const metrics = await ZenkoMetrics.asPrometheus();
-        res.writeHead(200, {
-            'Content-Type': ZenkoMetrics.asPrometheusContentType(),
-        });
-        res.end(metrics);
-    }
-}
--- a/lib/network/probe/ProbeServer.ts
+++ b/lib/network/probe/ProbeServer.ts
@ -4,19 +4,22 @@ import * as werelogs from 'werelogs';
 import errors from '../../errors';

 export const DEFAULT_LIVE_ROUTE = '/_/live';
-export const DEFAULT_READY_ROUTE = '/_/ready';
-export const DEFAULT_METRICS_ROUTE = '/metrics';
+export const DEFAULT_READY_ROUTE = '/_/live';
+export const DEFAULT_METRICS_ROUTE = '/_/metrics';

 /**
- * ProbeDelegate is used to handle probe checks.
- * You can sendSuccess and sendError from Utils to handle success
- * and failure conditions.
+ * ProbeDelegate is used to determine if a probe is successful or
+ * if any errors are present.
+ * If everything is working as intended, it is a no-op.
+ * Otherwise, return a string representing what is failing.
 * @callback ProbeDelegate
 * @param res - HTTP response for writing
 * @param log - Werelogs instance for logging if you choose to
+ * @return String representing issues to report. An empty
+ * string or undefined is used to represent no issues.
 */

-export type ProbeDelegate = (res: http.ServerResponse, log: werelogs.RequestLogger) => string | void
+export type ProbeDelegate = (res: http.ServerResponse, log: RequestLogger) => string | void

 export type ProbeServerParams = {
    port: number;
@ -87,6 +90,12 @@ export class ProbeServer extends httpServer {
            return;
        }

-        this._handlers.get(req.url ?? '')?.(res, log);
+        const probeResponse = this._handlers.get(req.url!)!(res, log);
+        if (probeResponse !== undefined && probeResponse !== '') {
+            // Return an internal error with the response
+            errors.InternalError
+                .customizeDescription(probeResponse)
+                .writeResponse(res);
+        }
    }
 }
--- a/lib/network/probe/Utils.ts
+++ b/lib/network/probe/Utils.ts
@ -1,49 +0,0 @@
-import * as http from 'http';
-
-import { RequestLogger } from 'werelogs';
-
-import { ArsenalError } from '../../errors';
-
-/**
- * Send a successful HTTP response of 200 OK
- * @param res - HTTP response for writing
- * @param log - Werelogs instance for logging if you choose to
- * @param [message] - Message to send as response, defaults to OK
- */
-export function sendSuccess(
-    res: http.ServerResponse,
-    log: RequestLogger,
-    message = 'OK'
-) {
-    log.debug('replying with success');
-    res.writeHead(200);
-    res.end(message);
-}
-
-/**
- * Send an Arsenal Error response
- * @param res - HTTP response for writing
- * @param log - Werelogs instance for logging if you choose to
- * @param error - Error to send back to the user
- * @param [optMessage] - Message to use instead of the errors message
- */
-export function sendError(
-    res: http.ServerResponse,
-    log: RequestLogger,
-    error: ArsenalError,
-    optMessage?: string
-) {
-    const message = optMessage || error.description || '';
-    log.debug('sending back error response', {
-        httpCode: error.code,
-        errorType: error.message,
-        error: message,
-    });
-    res.writeHead(error.code);
-    res.end(
-        JSON.stringify({
-            errorType: error.message,
-            errorMessage: message,
-        })
-    );
-}
--- a/lib/network/rest/RESTClient.ts
+++ b/lib/network/rest/RESTClient.ts
@ -4,7 +4,7 @@ import * as werelogs from 'werelogs';
 import * as constants from '../../constants';
 import * as utils from './utils';
 import errors, { ArsenalError } from '../../errors';
-import { http as HttpAgent } from 'httpagent';
+import HttpAgent from 'agentkeepalive';
 import * as stream from 'stream';

 function setRequestUids(reqHeaders: http.IncomingHttpHeaders, reqUids: string) {
@ -71,9 +71,8 @@ function makeErrorFromHTTPResponse(response: http.IncomingMessage) {
 export default class RESTClient {
    host: string;
    port: number;
-    httpAgent: http.Agent;
+    httpAgent: HttpAgent;
    logging: werelogs.Logger;
-    isPassthrough: boolean;

    /**
     * Interface to the data file server
@ -89,19 +88,17 @@ export default class RESTClient {
        host: string;
        port: number;
        logApi: { Logger: typeof werelogs.Logger };
-        isPassthrough?: boolean;
    }) {
        assert(params.host);
        assert(params.port);

        this.host = params.host;
        this.port = params.port;
-        this.isPassthrough = params.isPassthrough || false;
        this.logging = new (params.logApi || werelogs).Logger('DataFileRESTClient');
-        this.httpAgent = new HttpAgent.Agent({
+        this.httpAgent = new HttpAgent({
            keepAlive: true,
            freeSocketTimeout: constants.httpClientFreeSocketTimeout,
-        }) as http.Agent;
+        });
    }

    /** Destroy the HTTP agent, forcing a close of the remaining open connections */
@ -119,18 +116,16 @@ export default class RESTClient {
        method: string,
        headers: http.OutgoingHttpHeaders | null,
        key: string | null,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
        responseCb: (res: http.IncomingMessage) => void,
    ) {
        const reqHeaders = headers || {};
        const urlKey = key || '';
-        const prefix = this.isPassthrough ?
-            constants.passthroughFileURL : constants.dataFileURL;
        const reqParams = {
            hostname: this.host,
            port: this.port,
            method,
-            path: encodeURI(`${prefix}/${urlKey}`),
+            path: `${constants.dataFileURL}/${urlKey}`,
            headers: reqHeaders,
            agent: this.httpAgent,
        };
--- a/lib/network/rest/RESTServer.ts
+++ b/lib/network/rest/RESTServer.ts
@ -4,7 +4,7 @@ import * as werelogs from 'werelogs';
 import * as http from 'http';
 import httpServer from '../http/server';
 import * as constants from '../../constants';
-import { parseURL } from './utils';
+import * as utils from './utils';
 import * as httpUtils from '../http/utils';
 import errors, { ArsenalError } from '../../errors';

@ -25,7 +25,7 @@ function setContentRange(

 function sendError(
    res: http.ServerResponse,
-    log: werelogs.RequestLogger,
+    log: RequestLogger,
    error: ArsenalError,
    optMessage?: string,
 ) {
@ -38,6 +38,42 @@ function sendError(
        errorMessage: message })}\n`);
 }

+/**
+ * Parse the given url and return a pathInfo object. Sanity checks are
+ * performed.
+ *
+ * @param urlStr - URL to parse
+ * @param expectKey - whether the command expects to see a
+ *   key in the URL
+ * @return a pathInfo object with URL items containing the
+ * following attributes:
+ *   - pathInfo.service {String} - The name of REST service ("DataFile")
+ *   - pathInfo.key {String} - The requested key
+ */
+function parseURL(urlStr: string, expectKey: boolean) {
+    const urlObj = url.parse(urlStr);
+    const pathInfo = utils.explodePath(urlObj.path!);
+    if (pathInfo.service !== constants.dataFileURL) {
+        throw errors.InvalidAction.customizeDescription(
+            `unsupported service '${pathInfo.service}'`);
+    }
+    if (expectKey && pathInfo.key === undefined) {
+        throw errors.MissingParameter.customizeDescription(
+            'URL is missing key');
+    }
+    if (!expectKey && pathInfo.key !== undefined) {
+        // note: we may implement rewrite functionality by allowing a
+        // key in the URL, though we may still provide the new key in
+        // the Location header to keep immutability property and
+        // atomicity of the update (we would just remove the old
+        // object when the new one has been written entirely in this
+        // case, saving a request over an equivalent PUT + DELETE).
+        throw errors.InvalidURI.customizeDescription(
+            'PUT url cannot contain a key');
+    }
+    return pathInfo;
+}
+
 /**
 * @class
 * @classdesc REST Server interface
@ -68,6 +104,7 @@ export default class RESTServer extends httpServer {
    }) {
        assert(params.port);

+        // @ts-expect-error
        werelogs.configure({
            level: params.log.logLevel,
            dump: params.log.dumpLevel,
@ -141,7 +178,7 @@ export default class RESTServer extends httpServer {
    _onPut(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let size: number;
        try {
@ -183,7 +220,7 @@ export default class RESTServer extends httpServer {
    _onGet(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let pathInfo: ReturnType<typeof parseURL>;
        let rangeSpec: ReturnType<typeof httpUtils.parseRangeSpec> | undefined =
@ -266,7 +303,7 @@ export default class RESTServer extends httpServer {
    _onDelete(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let pathInfo: ReturnType<typeof parseURL>;
        try {
--- a/lib/network/rest/utils.ts
+++ b/lib/network/rest/utils.ts
@ -1,16 +1,6 @@
 import errors from '../../errors';
-import * as constants from '../../constants';
-import * as url from 'url';
-const passthroughPrefixLength = constants.passthroughFileURL.length;

 export function explodePath(path: string) {
-    if (path.startsWith(constants.passthroughFileURL)) {
-        const key = path.slice(passthroughPrefixLength + 1);
-        return {
-            service: constants.passthroughFileURL,
-            key: key.length > 0 ? key : undefined,
-        };
-    }
    const pathMatch = /^(\/[a-zA-Z0-9]+)(\/([0-9a-f]*))?$/.exec(path);
    if (pathMatch) {
        return {
@ -20,41 +10,4 @@ export function explodePath(path: string) {
        };
    }
    throw errors.InvalidURI.customizeDescription('malformed URI');
-}
-
-/**
- * Parse the given url and return a pathInfo object. Sanity checks are
- * performed.
- *
- * @param urlStr - URL to parse
- * @param expectKey - whether the command expects to see a
- *   key in the URL
- * @return a pathInfo object with URL items containing the
- * following attributes:
- *   - pathInfo.service {String} - The name of REST service ("DataFile")
- *   - pathInfo.key {String} - The requested key
- */
-export function parseURL(urlStr: string, expectKey: boolean) {
-    const urlObj = url.parse(urlStr);
-    const pathInfo = explodePath(decodeURI(urlObj.path!));
-    if ((pathInfo.service !== constants.dataFileURL)
-        && (pathInfo.service !== constants.passthroughFileURL)) {
-        throw errors.InvalidAction.customizeDescription(
-            `unsupported service '${pathInfo.service}'`);
-    }
-    if (expectKey && pathInfo.key === undefined) {
-        throw errors.MissingParameter.customizeDescription(
-            'URL is missing key');
-    }
-    if (!expectKey && pathInfo.key !== undefined) {
-        // note: we may implement rewrite functionality by allowing a
-        // key in the URL, though we may still provide the new key in
-        // the Location header to keep immutability property and
-        // atomicity of the update (we would just remove the old
-        // object when the new one has been written entirely in this
-        // case, saving a request over an equivalent PUT + DELETE).
-        throw errors.InvalidURI.customizeDescription(
-            'PUT url cannot contain a key');
-    }
-    return pathInfo;
-}
+};
--- a/lib/network/rpc/rpc.ts
+++ b/lib/network/rpc/rpc.ts
@ -1,6 +1,6 @@
 import ioClient from 'socket.io-client';
 import * as http from 'http';
-import { Server as IOServer } from 'socket.io';
+import io from 'socket.io';
 import * as sioStream from './sio-stream';
 import async from 'async';
 import assert from 'assert';
@ -497,7 +497,7 @@ export function RPCServer(params: {
    assert(params.logger);

    const httpServer = http.createServer();
-    const server = new IOServer(httpServer, { maxHttpBufferSize: 1e8 });
+    const server = io(httpServer);
    const log = params.logger;

    /**
@ -508,7 +508,7 @@ export function RPCServer(params: {
     *
     * @param {BaseService} serviceList - list of services to register
     */
-    (server as any).registerServices = function registerServices(...serviceList: any[]) {
+    server.registerServices = function registerServices(...serviceList: any[]) {
        serviceList.forEach(service => {
            const sock = this.of(service.namespace);
            sock.on('connection', conn => {
@ -536,7 +536,7 @@ export function RPCServer(params: {
        });
    };

-    (server as any).listen = function listen(port, bindAddress = undefined) {
+    server.listen = function listen(port, bindAddress = undefined) {
        httpServer.listen(port, bindAddress);
    };

--- a/lib/patches/locationConstraints.ts
+++ b/lib/patches/locationConstraints.ts
@ -1,209 +0,0 @@
-import { URL } from 'url';
-import { decryptSecret } from '../executables/pensieveCreds/utils';
-import { Logger } from 'werelogs';
-
-export type LocationType =
-    | 'location-mem-v1'
-    | 'location-file-v1'
-    | 'location-azure-v1'
-    | 'location-ceph-radosgw-s3-v1'
-    | 'location-scality-ring-s3-v1'
-    | 'location-aws-s3-v1'
-    | 'location-wasabi-v1'
-    | 'location-do-spaces-v1'
-    | 'location-gcp-v1'
-    | 'location-scality-sproxyd-v1'
-    | 'location-nfs-mount-v1'
-    | 'location-scality-hdclient-v2';
-
-export interface OverlayLocations {
-    [key: string]: {
-        name: string;
-        objectId: string;
-        details?: any;
-        locationType: string;
-        sizeLimitGB?: number;
-        isTransient?: boolean;
-        legacyAwsBehavior?: boolean;
-    };
-}
-
-export type Location = {
-    type:
-        | 'mem'
-        | 'file'
-        | 'azure'
-        | 'aws_s3'
-        | 'gcp'
-        | 'scality'
-        | 'pfs'
-        | 'scality';
-    name: string;
-    objectId: string;
-    details: { [key: string]: any };
-    locationType: string;
-    sizeLimitGB: number | null;
-    isTransient: boolean;
-    legacyAwsBehavior: boolean;
-};
-
-export function patchLocations(
-    overlayLocations: OverlayLocations | undefined | null,
-    creds: any,
-    log: Logger
-) {
-    const locs = overlayLocations ?? {};
-    return Object.entries(locs).reduce<{ [key: string]: Location }>(
-        (acc, [k, l]) => {
-            const location: Location = {
-                type: 'mem',
-                name: k,
-                objectId: l.objectId,
-                details: l.details || {},
-                locationType: l.locationType,
-                sizeLimitGB: l.sizeLimitGB || null,
-                isTransient: Boolean(l.isTransient),
-                legacyAwsBehavior: Boolean(l.legacyAwsBehavior),
-            };
-            let supportsVersioning = false;
-            let pathStyle = process.env.CI_CEPH !== undefined;
-
-            switch (l.locationType) {
-                case 'location-mem-v1':
-                    location.type = 'mem';
-                    location.details = { supportsVersioning: true };
-                    break;
-                case 'location-file-v1':
-                    location.type = 'file';
-                    location.details = { supportsVersioning: true };
-                    break;
-                case 'location-azure-v1':
-                    location.type = 'azure';
-                    if (l.details.secretKey && l.details.secretKey.length > 0) {
-                        location.details = {
-                            bucketMatch: l.details.bucketMatch,
-                            azureStorageEndpoint: l.details.endpoint,
-                            azureStorageAccountName: l.details.accessKey,
-                            azureStorageAccessKey: decryptSecret(
-                                creds,
-                                l.details.secretKey
-                            ),
-                            azureContainerName: l.details.bucketName,
-                        };
-                    }
-                    break;
-                case 'location-ceph-radosgw-s3-v1':
-                case 'location-scality-ring-s3-v1':
-                    pathStyle = true; // fallthrough
-                case 'location-aws-s3-v1':
-                case 'location-wasabi-v1':
-                    supportsVersioning = true; // fallthrough
-                case 'location-do-spaces-v1':
-                    location.type = 'aws_s3';
-                    if (l.details.secretKey && l.details.secretKey.length > 0) {
-                        let https = true;
-                        let awsEndpoint =
-                            l.details.endpoint || 's3.amazonaws.com';
-                        if (awsEndpoint.includes('://')) {
-                            const url = new URL(awsEndpoint);
-                            awsEndpoint = url.host;
-                            https = url.protocol.includes('https');
-                        }
-
-                        location.details = {
-                            credentials: {
-                                accessKey: l.details.accessKey,
-                                secretKey: decryptSecret(
-                                    creds,
-                                    l.details.secretKey
-                                ),
-                            },
-                            bucketName: l.details.bucketName,
-                            bucketMatch: l.details.bucketMatch,
-                            serverSideEncryption: Boolean(
-                                l.details.serverSideEncryption
-                            ),
-                            region: l.details.region,
-                            awsEndpoint,
-                            supportsVersioning,
-                            pathStyle,
-                            https,
-                        };
-                    }
-                    break;
-                case 'location-gcp-v1':
-                    location.type = 'gcp';
-                    if (l.details.secretKey && l.details.secretKey.length > 0) {
-                        location.details = {
-                            credentials: {
-                                accessKey: l.details.accessKey,
-                                secretKey: decryptSecret(
-                                    creds,
-                                    l.details.secretKey
-                                ),
-                            },
-                            bucketName: l.details.bucketName,
-                            mpuBucketName: l.details.mpuBucketName,
-                            bucketMatch: l.details.bucketMatch,
-                            gcpEndpoint:
-                                l.details.endpoint || 'storage.googleapis.com',
-                            https: true,
-                        };
-                    }
-                    break;
-                case 'location-scality-sproxyd-v1':
-                    location.type = 'scality';
-                    if (
-                        l.details &&
-                        l.details.bootstrapList &&
-                        l.details.proxyPath
-                    ) {
-                        location.details = {
-                            supportsVersioning: true,
-                            connector: {
-                                sproxyd: {
-                                    chordCos: l.details.chordCos || null,
-                                    bootstrap: l.details.bootstrapList,
-                                    path: l.details.proxyPath,
-                                },
-                            },
-                        };
-                    }
-                    break;
-                case 'location-nfs-mount-v1':
-                    location.type = 'pfs';
-                    if (l.details) {
-                        location.details = {
-                            supportsVersioning: true,
-                            bucketMatch: true,
-                            pfsDaemonEndpoint: {
-                                host: `${l.name}-cosmos-pfsd`,
-                                port: 80,
-                            },
-                        };
-                    }
-                    break;
-                case 'location-scality-hdclient-v2':
-                    location.type = 'scality';
-                    if (l.details && l.details.bootstrapList) {
-                        location.details = {
-                            supportsVersioning: true,
-                            connector: {
-                                hdclient: {
-                                    bootstrap: l.details.bootstrapList,
-                                },
-                            },
-                        };
-                    }
-                    break;
-                default:
-                    log.info('unknown location type', {
-                        locationType: l.locationType,
-                    });
-                    return acc;
-            }
-            return { ...acc, [location.name]: location };
-        },
-        {}
-    );
-}
--- a/lib/policy/resourcePolicySchema.json
+++ b/lib/policy/resourcePolicySchema.json
@ -38,7 +38,7 @@
        },
        "principalAWSUserArn": {
            "type": "string",
-            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,2017}$"
+            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,64}$"
        },
        "principalAWSRoleArn": {
            "type": "string",
@ -360,9 +360,6 @@
            "type": "string",
            "const": "2012-10-17"
        },
-        "Id": {
-            "type": "string"
-        },
        "Statement": {
            "oneOf": [
                {
--- a/lib/policy/userPolicySchema.json
+++ b/lib/policy/userPolicySchema.json
@ -28,7 +28,7 @@
        },
        "principalAWSUserArn": {
            "type": "string",
-            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,2017}$"
+            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,64}$"
        },
        "principalAWSRoleArn": {
            "type": "string",
@ -38,10 +38,6 @@
            "type": "string",
            "pattern": "^arn:aws:iam::[0-9]{12}:saml-provider/[\\w._-]{1,128}$"
        },
-        "principalFederatedOidcIdp": {
-            "type": "string",
-            "pattern": "^(?:http(s)?:\/\/)?[\\w.-]+(?:\\.[\\w\\.-]+)+[\\w\\-\\._~:/?#[\\]@!\\$&'\\(\\)\\*\\+,;=.]+$"
-        },
        "principalAWSItem": {
            "type": "object",
            "properties": {
@ -102,9 +98,6 @@
                    "oneOf": [
                        {
                            "$ref": "#/definitions/principalFederatedSamlIdp"
-                        },
-                        {
-                            "$ref": "#/definitions/principalFederatedOidcIdp"
                        }
                    ]
                }
--- a/lib/policyEvaluator/RequestContext.ts
+++ b/lib/policyEvaluator/RequestContext.ts
@ -12,39 +12,13 @@ import {
    actionMapSSO,
    actionMapSTS,
    actionMapMetadata,
-    actionMapScuba,
 } from './utils/actionMaps';

-export const actionNeedQuotaCheck = {
+const _actionNeedQuotaCheck = {
    objectPut: true,
-    objectPutVersion: true,
    objectPutPart: true,
-    objectRestore: true,
 };

-/**
- * This variable describes APIs that change the bytes
- * stored, requiring quota updates
- */
-export const actionWithDataDeletion = {
-    objectDelete: true,
-    objectDeleteVersion: true,
-    multipartDelete: true,
-    multiObjectDelete: true,
-};
-
-/**
- * The function returns true if the current API call is a copy object
- * and the action requires a quota evaluation logic, post retrieval
- * of the object metadata.
- * @param {string} action - the action being performed
- * @param {string} currentApi - the current API being called
- * @return {boolean} - whether the action requires a quota check
- */
-export function actionNeedQuotaCheckCopy(action: string, currentApi: string) {
-    return action === 'objectGet' && (currentApi === 'objectCopy' || currentApi === 'objectPutCopyPart');
-}
-
 function _findAction(service: string, method: string) {
    switch (service) {
        case 's3':
@ -62,8 +36,6 @@ function _findAction(service: string, method: string) {
            return actionMapSTS[method];
        case 'metadata':
            return actionMapMetadata[method];
-        case 'scuba':
-            return actionMapScuba[method];
        default:
            return undefined;
    }
@ -133,10 +105,6 @@ function _buildArn(
            return `arn:scality:metadata::${requesterInfo!.accountid}:` +
            `${generalResource}/`;
        }
-        case 'scuba': {
-            return `arn:scality:scuba::${requesterInfo!.accountid}:` +
-            `${generalResource}${specificResource ? '/' + specificResource : ''}`;
-        }
        default:
            return undefined;
    }
@ -151,9 +119,7 @@ export type RequesterInfo = {
    principalType: string;
    principaltype: string;
    userid: string;
-    username: string;
-    keycloakGroup: string;
-    keycloakRole: string;
+    username: string,
 }

 /**
@ -205,7 +171,6 @@ export default class RequestContext {
    _needTagEval: boolean;
    _foundAction?: string;
    _foundResource?: string;
-    _objectLockRetentionDays?: number | null;

    constructor(
        headers: { [key: string]: string | string[] },
@ -227,7 +192,6 @@ export default class RequestContext {
        requestObjTags?: string,
        existingObjTag?: string,
        needTagEval?: false,
-        objectLockRetentionDays?: number,
    ) {
        this._headers = headers;
        this._query = query;
@ -256,12 +220,10 @@ export default class RequestContext {
        this._securityToken = securityToken;
        this._policyArn = policyArn;
        this._action = action;
-        this._needQuota = actionNeedQuotaCheck[apiMethod] === true
-            || actionWithDataDeletion[apiMethod] === true;
+        this._needQuota = _actionNeedQuotaCheck[apiMethod] === true;
        this._requestObjTags = requestObjTags || null;
        this._existingObjTag = existingObjTag || null;
        this._needTagEval = needTagEval || false;
-        this._objectLockRetentionDays = objectLockRetentionDays || null;
        return this;
    }

@ -293,7 +255,6 @@ export default class RequestContext {
            requestObjTags: this._requestObjTags,
            existingObjTag: this._existingObjTag,
            needTagEval: this._needTagEval,
-            objectLockRetentionDays: this._objectLockRetentionDays,
        };
        return JSON.stringify(requestInfo);
    }
@ -334,7 +295,6 @@ export default class RequestContext {
            obj.requestObjTags,
            obj.existingObjTag,
            obj.needTagEval,
-            obj.objectLockRetentionDays,
        );
    }

@ -738,24 +698,4 @@ export default class RequestContext {
    getNeedTagEval() {
        return this._needTagEval;
    }
-
-    /**
-     * Get object lock retention days
-     *
-     * @returns objectLockRetentionDays - object lock retention days 
-     */
-    getObjectLockRetentionDays() {
-        return this._objectLockRetentionDays;
-    }
-
-    /**
-     * Set object lock retention days
-     *
-     * @param objectLockRetentionDays - object lock retention days
-     * @returns itself
-     */
-    setObjectLockRetentionDays(objectLockRetentionDays: number) {
-        this._objectLockRetentionDays = objectLockRetentionDays;
-        return this;
-    }
 }
--- a/lib/policyEvaluator/evaluator.ts
+++ b/lib/policyEvaluator/evaluator.ts
@ -310,7 +310,6 @@ export function evaluatePolicy(
 }

 /**
- * @deprecated Upgrade to standardEvaluateAllPolicies
 * Evaluate whether a request is permitted under a policy.
 * @param requestContext - Info necessary to
 * evaluate permission
@ -326,16 +325,6 @@ export function evaluateAllPolicies(
    allPolicies: any[],
    log: Logger,
 ): string {
-    return standardEvaluateAllPolicies(requestContext, allPolicies, log).verdict;
-}
-export function standardEvaluateAllPolicies(
-    requestContext: RequestContext,
-    allPolicies: any[],
-    log: Logger,
-): {
-    verdict: string;
-    isImplicit: boolean;
-} {
    log.trace('evaluating all policies');
    let allow = false;
    let allowWithTagCondition = false;
@ -344,10 +333,7 @@ export function standardEvaluateAllPolicies(
        const singlePolicyVerdict = evaluatePolicy(requestContext, allPolicies[i], log);
        // If there is any Deny, just return Deny
        if (singlePolicyVerdict === 'Deny') {
-            return {
-                verdict: 'Deny',
-                isImplicit: false,
-            };
+            return 'Deny';
        }
        if (singlePolicyVerdict === 'Allow') {
            allow = true;
@ -358,7 +344,6 @@ export function standardEvaluateAllPolicies(
        } // else 'Neutral'
    }
    let verdict;
-    let isImplicit = false;
    if (allow) {
        if (denyWithTagCondition) {
            verdict = 'NeedTagConditionEval';
@ -370,9 +355,8 @@ export function standardEvaluateAllPolicies(
            verdict = 'NeedTagConditionEval';
        } else {
            verdict = 'Deny';
-            isImplicit = true;
        }
    }
-    log.trace('result of evaluating all policies', { verdict, isImplicit });
-    return { verdict, isImplicit };
+    log.trace('result of evaluating all policies', { verdict });
+    return verdict;
 }
--- a/lib/policyEvaluator/utils/actionMaps.ts
+++ b/lib/policyEvaluator/utils/actionMaps.ts
@ -33,7 +33,6 @@ const sharedActionMap = {
    bypassGovernanceRetention: 's3:BypassGovernanceRetention',
    listMultipartUploads: 's3:ListBucketMultipartUploads',
    listParts: 's3:ListMultipartUploadParts',
-    metadataSearch: 's3:MetadataSearch',
    multipartDelete: 's3:AbortMultipartUpload',
    objectDelete: 's3:DeleteObject',
    objectDeleteTagging: 's3:DeleteObjectTagging',
@ -48,14 +47,6 @@ const sharedActionMap = {
    objectPutLegalHold: 's3:PutObjectLegalHold',
    objectPutRetention: 's3:PutObjectRetention',
    objectPutTagging: 's3:PutObjectTagging',
-    objectRestore: 's3:RestoreObject',
-    objectPutVersion: 's3:PutObjectVersion',
-};
-
-const actionMapBucketQuotas = {
-    bucketGetQuota: 'scality:GetBucketQuota',
-    bucketUpdateQuota: 'scality:UpdateBucketQuota',
-    bucketDeleteQuota: 'scality:DeleteBucketQuota',
 };

 // action map used for request context
@ -71,7 +62,6 @@ const actionMapRQ = {
    initiateMultipartUpload: 's3:PutObject',
    objectDeleteVersion: 's3:DeleteObjectVersion',
    objectDeleteTaggingVersion: 's3:DeleteObjectVersionTagging',
-    objectGetArchiveInfo: 'scality:GetObjectArchiveInfo',
    objectGetVersion: 's3:GetObjectVersion',
    objectGetACLVersion: 's3:GetObjectVersionAcl',
    objectGetTaggingVersion: 's3:GetObjectVersionTagging',
@ -80,17 +70,14 @@ const actionMapRQ = {
    objectPutTaggingVersion: 's3:PutObjectVersionTagging',
    serviceGet: 's3:ListAllMyBuckets',
    objectReplicate: 's3:ReplicateObject',
-    objectGetRetentionVersion: 's3:GetObjectRetention',
-    objectPutRetentionVersion: 's3:PutObjectRetention',
-    objectGetLegalHoldVersion: 's3:GetObjectLegalHold',
-    objectPutLegalHoldVersion: 's3:PutObjectLegalHold',
+    objectPutRetentionVersion: 's3:PutObjectVersionRetention',
+    objectPutLegalHoldVersion: 's3:PutObjectVersionLegalHold',
    listObjectVersions: 's3:ListBucketVersions',
    ...sharedActionMap,
-    ...actionMapBucketQuotas,
 };

 // action map used for bucket policies
-const actionMapBP = actionMapRQ;
+const actionMapBP = { ...sharedActionMap };

 // action map for all relevant s3 actions
 const actionMapS3 = {
@ -138,7 +125,6 @@ const actionMonitoringMapS3 = {
    initiateMultipartUpload: 'CreateMultipartUpload',
    listMultipartUploads: 'ListMultipartUploads',
    listParts: 'ListParts',
-    metadataSearch: 'MetadataSearch',
    multiObjectDelete: 'DeleteObjects',
    multipartDelete: 'AbortMultipartUpload',
    objectCopy: 'CopyObject',
@ -157,17 +143,7 @@ const actionMonitoringMapS3 = {
    objectPutPart: 'UploadPart',
    objectPutRetention: 'PutObjectRetention',
    objectPutTagging: 'PutObjectTagging',
-    objectRestore: 'RestoreObject',
    serviceGet: 'ListBuckets',
-    bucketGetQuota: 'GetBucketQuota',
-    bucketUpdateQuota: 'UpdateBucketQuota',
-    bucketDeleteQuota: 'DeleteBucketQuota', 
-};
-
-const actionMapAccountQuotas = {
-    UpdateAccountQuota : 'scality:UpdateAccountQuota',
-    DeleteAccountQuota : 'scality:DeleteAccountQuota',
-    GetAccountQuota : 'scality:GetAccountQuota',
 };

 const actionMapIAM = {
@ -192,7 +168,6 @@ const actionMapIAM = {
    getPolicyVersion: 'iam:GetPolicyVersion',
    getUser: 'iam:GetUser',
    listAccessKeys: 'iam:ListAccessKeys',
-    listEntitiesForPolicy: 'iam:ListEntitiesForPolicy',
    listGroupPolicies: 'iam:ListGroupPolicies',
    listGroups: 'iam:ListGroups',
    listGroupsForUser: 'iam:ListGroupsForUser',
@ -211,7 +186,6 @@ const actionMapIAM = {
    tagUser: 'iam:TagUser',
    unTagUser: 'iam:UntagUser',
    listUserTags: 'iam:ListUserTags',
-    ...actionMapAccountQuotas,
 };

 const actionMapSSO = {
@ -227,14 +201,6 @@ const actionMapMetadata = {
    default: 'metadata:bucketd',
 };

-const actionMapScuba = {
-    GetMetrics: 'scuba:GetMetrics',
-    AdminStartIngest: 'scuba:AdminStartIngest',
-    AdminStopIngest: 'scuba:AdminStopIngest',
-    AdminReadRaftCseq: 'scuba:AdminReadRaftCseq',
-    AdminTriggerRepair: 'scuba:AdminTriggerRepair',
-};
-
 export {
    actionMapRQ,
    actionMapBP,
@ -244,5 +210,4 @@ export {
    actionMapSSO,
    actionMapSTS,
    actionMapMetadata,
-    actionMapScuba,
 };
--- a/lib/policyEvaluator/utils/checkArnMatch.ts
+++ b/lib/policyEvaluator/utils/checkArnMatch.ts
@ -1,5 +1,5 @@
 import { handleWildcardInResource } from './wildcards';
-import { policyArnAllowedEmptyAccountId } from '../../constants';
+
 /**
 * Checks whether an ARN from a request matches an ARN in a policy
 * to compare against each portion of the ARN from the request
@ -38,10 +38,9 @@ export default function checkArnMatch(
        const requestSegment = caseSensitive ? requestArnArr[j] :
            requestArnArr[j].toLowerCase();
        const policyArnArr = policyArn.split(':');
-        // We want to allow an empty account ID for utapi and scuba service ARNs to not
+        // We want to allow an empty account ID for utapi service ARNs to not
        // break compatibility.
-        if (j === 4 && policyArnAllowedEmptyAccountId.includes(policyArnArr[2])
-            && policyArnArr[4] === '') {
+        if (j === 4 && policyArnArr[2] === 'utapi' && policyArnArr[4] === '') {
            continue;
        } else if (!segmentRegEx.test(requestSegment)) {
            return false;
--- a/lib/policyEvaluator/utils/conditions.ts
+++ b/lib/policyEvaluator/utils/conditions.ts
@ -142,8 +142,6 @@ export function findConditionKey(
    // header
    case 's3:ObjLocationConstraint': return headers['x-amz-meta-scal-location-constraint'];
    case 'sts:ExternalId': return requestContext.getRequesterExternalId();
-    case 'keycloak:groups': return requesterInfo.keycloakGroup;
-    case 'keycloak:roles': return requesterInfo.keycloakRole;
    case 'iam:PolicyArn': return requestContext.getPolicyArn();
    // s3:ExistingObjectTag - Used to check that existing object tag has
    // specific tag key and value. Extraction of correct tag key is done in CloudServer.
@ -168,9 +166,6 @@ export function findConditionKey(
        return requestContext.getNeedTagEval() && requestContext.getRequestObjTags()
            ? getTagKeys(requestContext.getRequestObjTags()!)
            : undefined;
-    // The maximum retention period is 100 years.
-    case 's3:object-lock-remaining-retention-days':
-        return requestContext.getObjectLockRetentionDays() || undefined;
    default:
        return undefined;
    }
--- a/lib/s3middleware/azureHelpers/ResultsCollector.ts
+++ b/lib/s3middleware/azureHelpers/ResultsCollector.ts
@ -30,7 +30,7 @@ export default class ResultsCollector extends EventEmitter {
     * @emits ResultCollector#done
     * @emits ResultCollector#error
     */
-    pushResult(err: Error | null | undefined, subPartIndex: number) {
+    pushResult(err: Error | undefined, subPartIndex: number) {
        this._results.push({
            error: err,
            subPartIndex,
--- a/lib/s3middleware/azureHelpers/mpuUtils.ts
+++ b/lib/s3middleware/azureHelpers/mpuUtils.ts
@ -1,15 +1,11 @@
 import assert from 'assert';
 import * as crypto from 'crypto';
 import * as stream from 'stream';
-import azure from '@azure/storage-blob';
-
-import { RequestLogger } from 'werelogs';
-
 import ResultsCollector from './ResultsCollector';
 import SubStreamInterface from './SubStreamInterface';
 import * as objectUtils from '../objectUtils';
 import MD5Sum from '../MD5Sum';
-import errors, { ArsenalError } from '../../errors';
+import errors from '../../errors';

 export const splitter = '|';
 export const overviewMpuKey = 'azure_mpu';
@ -65,7 +61,7 @@ export const getBlockId = (
    const paddedSubPart = padString(subPartIndex, 'subPart');
    const blockId = `${uploadId}${splitter}partNumber${paddedPartNumber}` +
        `${splitter}subPart${paddedSubPart}${splitter}`;
-    return Buffer.from(padString(blockId, 'part')).toString('base64');
+    return padString(blockId, 'part');
 };

 export const getSummaryPartId = (partNumber: number, eTag: string, size: number) => {
@ -104,17 +100,10 @@ export const getSubPartIds = (
 ) => [...Array(part.numberSubParts).keys()].map(subPartIndex =>
        getBlockId(uploadId, part.partNumber, subPartIndex));

-type ErrorWrapperFn = (
-    s3Method: string,
-    azureMethod: string,
-    command: (client: azure.ContainerClient) => Promise<any>,
-    log: RequestLogger,
-    cb: (err: ArsenalError | null | undefined) => void,
-) => void
-
+// TODO Better type this
 export const putSinglePart = (
-    errorWrapperFn: ErrorWrapperFn,
-    request: stream.Readable,
+    errorWrapperFn: (first: string, second: string, third: any, log: any, cb: any) => void,
+    request: any,
    params: {
        bucketName: string;
        partNumber: number;
@ -125,44 +114,44 @@ export const putSinglePart = (
    },
    dataStoreName: string,
    log: RequestLogger,
-    cb: (err: ArsenalError | null | undefined, dataStoreETag?: string, size?: number) => void,
+    cb: any,
 ) => {
    const { bucketName, partNumber, size, objectKey, contentMD5, uploadId }
        = params;
    const blockId = getBlockId(uploadId, partNumber, 0);
    const passThrough = new stream.PassThrough();
    const options = contentMD5
-        ? { transactionalContentMD5: objectUtils.getMD5Buffer(contentMD5) }
+        ? { useTransactionalMD5: true, transactionalContentMD5: contentMD5 }
        : {};
    request.pipe(passThrough);
-    return errorWrapperFn('uploadPart', 'createBlockFromStream', async client => {
-        try {
-            const result = await client.getBlockBlobClient(objectKey)
-                .stageBlock(blockId, () => passThrough, size, options);
-            const md5 = result.contentMD5 || '';
-            const eTag = objectUtils.getHexMD5(md5);
-            return eTag
-        } catch (err: any) {
-            log.error('Error from Azure data backend uploadPart',
-                { error: err.message, dataStoreName });
-            if (err.code === 'ContainerNotFound') {
-                throw errors.NoSuchBucket;
-            }
-            if (err.code === 'InvalidMd5') {
-                throw errors.InvalidDigest;
-            }
-            if (err.code === 'Md5Mismatch') {
-                throw errors.BadDigest;
-            }
-            throw errors.InternalError.customizeDescription(
-                `Error returned from Azure: ${err.message}`
-            );
-        }    
-    }, log, cb);
+    return errorWrapperFn('uploadPart', 'createBlockFromStream',
+        [blockId, bucketName, objectKey, passThrough, size, options,
+            (err: any | null, result: any) => {
+                if (err) {
+                    log.error('Error from Azure data backend uploadPart',
+                        { error: err.message, dataStoreName });
+                    if (err.code === 'ContainerNotFound') {
+                        return cb(errors.NoSuchBucket);
+                    }
+                    if (err.code === 'InvalidMd5') {
+                        return cb(errors.InvalidDigest);
+                    }
+                    if (err.code === 'Md5Mismatch') {
+                        return cb(errors.BadDigest);
+                    }
+                    return cb(errors.InternalError.customizeDescription(
+                        `Error returned from Azure: ${err.message}`),
+                    );
+                }
+                const md5 = result.headers['content-md5'] || '';
+                const eTag = objectUtils.getHexMD5(md5);
+                return cb(null, eTag, size);
+            }], log, cb);
 };

-const putNextSubPart = (
-    errorWrapperFn: ErrorWrapperFn,
+// TODO type this
+export const putNextSubPart = (
+    errorWrapperFn: any,
    partParams: {
        uploadId: string;
        partNumber: number;
@ -170,10 +159,11 @@ const putNextSubPart = (
        objectKey: string;
    },
    subPartInfo: { lastPartIndex: number; lastPartSize: number },
-    subPartStream: stream.Readable,
+    subPartStream: any,
    subPartIndex: number,
    resultsCollector: ResultsCollector,
    log: RequestLogger,
+    cb: any,
 ) => {
    const { uploadId, partNumber, bucketName, objectKey } = partParams;
    const subPartSize = getSubPartSize(
@ -181,20 +171,14 @@ const putNextSubPart = (
    const subPartId = getBlockId(uploadId, partNumber,
        subPartIndex);
    resultsCollector.pushOp();
-    errorWrapperFn('uploadPart', 'createBlockFromStream', async client => {
-        try {
-            const result = await client.getBlockBlobClient(objectKey)
-                .stageBlock(subPartId, () => subPartStream, subPartSize, {});
-            resultsCollector.pushResult(null, subPartIndex);
-        } catch (err: any) {
-            resultsCollector.pushResult(err, subPartIndex);
-        }
-    }, log, () => {});
+    errorWrapperFn('uploadPart', 'createBlockFromStream',
+        [subPartId, bucketName, objectKey, subPartStream, subPartSize,
+            {}, err => resultsCollector.pushResult(err, subPartIndex)], log, cb);
 };

 export const putSubParts = (
-    errorWrapperFn: ErrorWrapperFn,
-    request: stream.Readable,
+    errorWrapperFn: any,
+    request: any,
    params: {
        uploadId: string;
        partNumber: number;
@ -204,7 +188,7 @@ export const putSubParts = (
    },
    dataStoreName: string,
    log: RequestLogger,
-    cb: (err: ArsenalError | null | undefined, dataStoreETag?: string) => void,
+    cb: any,
 ) => {
    const subPartInfo = getSubPartInfo(params.size);
    const resultsCollector = new ResultsCollector();
@ -243,13 +227,14 @@ export const putSubParts = (
        const totalLength = streamInterface.getTotalBytesStreamed();
        log.trace('successfully put subparts to Azure',
            { numberSubParts, totalLength });
-        hashedStream.on('hashed', () => cb(null, hashedStream.completedHash));
+        hashedStream.on('hashed', () => cb(null, hashedStream.completedHash,
+            totalLength));

        // in case the hashed event was already emitted before the
        // event handler was registered:
        if (hashedStream.completedHash) {
            hashedStream.removeAllListeners('hashed');
-            return cb(null, hashedStream.completedHash);
+            return cb(null, hashedStream.completedHash, totalLength);
        }
        return undefined;
    });
@ -257,7 +242,7 @@ export const putSubParts = (
    const currentStream = streamInterface.getCurrentStream();
    // start first put to Azure before we start streaming the data
    putNextSubPart(errorWrapperFn, params, subPartInfo,
-        currentStream, 0, resultsCollector, log);
+        currentStream, 0, resultsCollector, log, cb);

    request.pipe(hashedStream);
    hashedStream.on('end', () => {
@ -277,8 +262,8 @@ export const putSubParts = (
            }
            const { nextStream, subPartIndex } =
                streamInterface.transitionToNextStream();
-            putNextSubPart(errorWrapperFn, params, subPartInfo, nextStream,
-                subPartIndex, resultsCollector, log);
+            putNextSubPart(errorWrapperFn, params, subPartInfo,
+                nextStream, subPartIndex, resultsCollector, log, cb);
            streamInterface.write(firstChunk);
        } else {
            streamInterface.write(data);
--- a/lib/s3middleware/lifecycleHelpers/LifecycleDateTime.ts
+++ b/lib/s3middleware/lifecycleHelpers/LifecycleDateTime.ts
@ -1,25 +1,19 @@
-import { scaleMsPerDay } from '../objectUtils';
-const msInOneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.
+const oneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.

 export default class LifecycleDateTime {
    _transitionOneDayEarlier?: boolean;
    _expireOneDayEarlier?: boolean;
-    _timeProgressionFactor?: number;
-    _scaledMsPerDay: number;

    constructor(params?: {
        transitionOneDayEarlier: boolean;
        expireOneDayEarlier: boolean;
-        timeProgressionFactor: number;
    }) {
        this._transitionOneDayEarlier = params?.transitionOneDayEarlier;
        this._expireOneDayEarlier = params?.expireOneDayEarlier;
-        this._timeProgressionFactor = params?.timeProgressionFactor || 1;
-        this._scaledMsPerDay = scaleMsPerDay(this._timeProgressionFactor);
    }

    getCurrentDate() {
-        const timeTravel = this._expireOneDayEarlier ? msInOneDay : 0;
+        const timeTravel = this._expireOneDayEarlier ? oneDay : 0;
        return Date.now() + timeTravel;
    }

@ -31,7 +25,7 @@ export default class LifecycleDateTime {
    findDaysSince(date: Date) {
        const now = this.getCurrentDate();
        const diff = now - date.getTime();
-        return Math.floor(diff / this._scaledMsPerDay);
+        return Math.floor(diff / (1000 * 60 * 60 * 24));
    }

    /**
@ -58,25 +52,8 @@ export default class LifecycleDateTime {
        }
        if (transition.Days !== undefined) {
            const lastModifiedTime = this.getTimestamp(lastModified);
-            const timeTravel = this._transitionOneDayEarlier ? -msInOneDay : 0;
-            return lastModifiedTime + (transition.Days * this._scaledMsPerDay) + timeTravel;
-        }
-    }
-
-    /**
-     * Find the Unix time at which the non-current version transition should occur.
-     * @param transition - A non-current version transition from the lifecycle non-current version transitions
-     * @param lastModified - The object's last modified date
-     * @return - The normalized transition timestamp
-     */
-    getNCVTransitionTimestamp(
-        transition: { NoncurrentDays?: number },
-        lastModified: string,
-    ) {
-        if (transition.NoncurrentDays !== undefined) {
-            const lastModifiedTime = this.getTimestamp(lastModified);
-            const timeTravel = this._transitionOneDayEarlier ? -msInOneDay : 0;
-            return lastModifiedTime + (transition.NoncurrentDays * this._scaledMsPerDay) + timeTravel;
+            const timeTravel = this._transitionOneDayEarlier ? -oneDay : 0;
+            return lastModifiedTime + (transition.Days * oneDay) + timeTravel;
        }
    }
 }
--- a/lib/s3middleware/lifecycleHelpers/LifecycleUtils.ts
+++ b/lib/s3middleware/lifecycleHelpers/LifecycleUtils.ts
@ -61,47 +61,6 @@ export default class LifecycleUtils {
        return trans1 > trans2 ? transition1 : transition2;
    }

-    /**
-    * Compare two non-current version transition rules and return the one that is most recent.
-    * @param params - The function parameters
-    * @param params.transition1 - A non-current version transition from the current rule
-    * @param params.transition2 - A non-current version transition from the previous rule
-    * @param params.lastModified - The object's last modified
-    * date
-    * @return The most applicable transition rule
-    */
-    compareNCVTransitions(params: {
-        lastModified: string;
-        transition1: any;
-        transition2?: any;
-    }): number | undefined;
-    compareNCVTransitions(params: {
-        lastModified: string;
-        transition1?: any;
-        transition2: any;
-    }): number | undefined;
-    compareNCVTransitions(params: {
-        lastModified: string;
-        transition1: any;
-        transition2: any;
-    }): number | undefined;
-    compareNCVTransitions(params: {
-        lastModified: string;
-        transition1?: any;
-        transition2?: any;
-    }) {
-        const { transition1, transition2, lastModified } = params;
-        if (transition1 === undefined) {
-            return transition2;
-        }
-        if (transition2 === undefined) {
-            return transition1;
-        }
-        const trans1 = this._datetime.getNCVTransitionTimestamp(transition1!, lastModified)!;
-        const trans2 = this._datetime.getNCVTransitionTimestamp(transition2!, lastModified)!;
-        return trans1 > trans2 ? transition1 : transition2;
-    }
-
    // TODO Fix This
    /**
    * Find the most relevant trantition rule for the given transitions array
@ -139,42 +98,6 @@ export default class LifecycleUtils {
        });
    }

-    /**
-    * Find the most relevant non-current version transition rule for the given transitions array
-    * and any previously stored non-current version transition from another rule.
-    * @param params - The function parameters
-    * @param params.transitions - Array of lifecycle non-current version transitions
-    * @param params.lastModified - The object's last modified
-    * date
-    * @return The most applicable non-current version transition rule
-    */
-    getApplicableNCVTransition(params: {
-        store: any;
-        currentDate: Date;
-        transitions: any[];
-        lastModified: string;
-    }) {
-        const { transitions, store, lastModified, currentDate } = params;
-        const transition = transitions.reduce((result, transition) => {
-            const isApplicable = // Is the transition time in the past?
-            this._datetime.getTimestamp(currentDate) >=
-                this._datetime.getNCVTransitionTimestamp(transition, lastModified)!;
-            if (!isApplicable) {
-                return result;
-            }
-            return this.compareNCVTransitions({
-                transition1: transition,
-                transition2: result,
-                lastModified,
-            });
-        }, undefined);
-        return this.compareNCVTransitions({
-            transition1: transition,
-            transition2: store.NoncurrentVersionTransition,
-            lastModified,
-        });
-    }
-
    // TODO
    /**
    * Filter out all rules based on `Status` and `Filter` (Prefix and Tags)
@ -318,17 +241,7 @@ export default class LifecycleUtils {
                    currentDate,
                });
            }
-
-            const ncvt = 'NoncurrentVersionTransitions';
-            const hasNoncurrentVersionTransitions = Array.isArray(rule[ncvt]) && rule[ncvt].length > 0;
-            if (hasNoncurrentVersionTransitions && this._supportedRules.includes('noncurrentVersionTransition')) {
-                store.NoncurrentVersionTransition = this.getApplicableNCVTransition({
-                    transitions: rule.NoncurrentVersionTransitions,
-                    lastModified: metadata.LastModified,
-                    store,
-                    currentDate,
-                });
-            }
+            // TODO: Add support for NoncurrentVersionTransitions.
            return store;
        }, {});
        // Do not transition to a location where the object is already stored.
@ -336,12 +249,6 @@ export default class LifecycleUtils {
            && applicableRules.Transition.StorageClass === metadata.StorageClass) {
            applicableRules.Transition = undefined;
        }
-
-        if (applicableRules.NoncurrentVersionTransition
-            && applicableRules.NoncurrentVersionTransition.StorageClass === metadata.StorageClass) {
-            applicableRules.NoncurrentVersionTransition = undefined;
-        }
-
        return applicableRules;
        /* eslint-enable no-param-reassign */
    }
--- a/lib/s3middleware/objectRestore.ts
+++ b/lib/s3middleware/objectRestore.ts
@ -1,110 +0,0 @@
-import {parseStringPromise} from 'xml2js';
-import errors, {ArsenalError} from '../errors';
-import * as werelogs from 'werelogs';
-import {validRestoreObjectTiers} from "../constants";
-
-/*
-    Format of xml request:
-    <RestoreRequest>
-      <Days>integer</Days>
-      <Tier>Standard|Bulk|Expedited</Tier>
-    </RestoreRequest>
-*/
-
-/**
- * validate restore request xml
- * @param restoreRequest - parsed restore request object
- * @return{ArsenalError|undefined} - error on failure, undefined on success
- */
-function validateRestoreRequest(restoreRequest?: any) {
-    if (!restoreRequest) {
-        const desc = 'request xml does not contain RestoreRequest';
-        return errors.MalformedXML.customizeDescription(desc);
-    }
-    if (!restoreRequest.Days || !restoreRequest.Days[0]) {
-        const desc = 'request xml does not contain RestoreRequest.Days';
-        return errors.MalformedXML.customizeDescription(desc);
-    }
-    // RestoreRequest.Days must be greater than or equal to 1
-    const daysValue = Number.parseInt(restoreRequest.Days[0], 10);
-    if (Number.isNaN(daysValue)) {
-        const desc = `RestoreRequest.Days is invalid type. [${restoreRequest.Days[0]}]`;
-        return errors.MalformedXML.customizeDescription(desc);
-    }
-    if (daysValue < 1) {
-        const desc = `RestoreRequest.Days must be greater than 0. [${restoreRequest.Days[0]}]`;
-        return errors.MalformedXML.customizeDescription(desc);
-    }
-    if (daysValue > 2147483647) {
-        const desc = `RestoreRequest.Days must be less than 2147483648. [${restoreRequest.Days[0]}]`;
-        return errors.MalformedXML.customizeDescription(desc);
-    }
-    if (restoreRequest.Tier && restoreRequest.Tier[0] && !validRestoreObjectTiers.has(restoreRequest.Tier[0])) {
-        const desc = `RestoreRequest.Tier is invalid value. [${restoreRequest.Tier[0]}]`;
-        return errors.MalformedXML.customizeDescription(desc);
-    }
-    return undefined;
-}
-
-/**
- * parseRestoreRequestXml - Parse and validate xml body, returning callback with
- * object restoreReqObj: { days: <value>, tier: <value> }
- * @param xml - xml body to parse and validate
- * @param log - Werelogs logger
- * @param cb - callback to server
- * @return - calls callback with object restore request or error
- */
-export async function parseRestoreRequestXml(
-    xml: string,
-    log: werelogs.Logger,
-    cb: (err: ArsenalError | null, data?: any) => void,
-) {
-    let result;
-    try {
-        result = await parseStringPromise(xml);
-    } catch (err) {
-        log.debug('xml parsing failed', {
-            error: err,
-            method: 'parseRestoreXml',
-            xml,
-        });
-        return cb(errors.MalformedXML);
-    }
-    if (!result) {
-        const desc = 'request xml is undefined or empty';
-        return cb(errors.MalformedXML.customizeDescription(desc));
-    }
-    const restoreRequest = result.RestoreRequest;
-    const restoreReqError = validateRestoreRequest(restoreRequest);
-    if (restoreReqError) {
-        log.debug('restore request validation failed', {
-            error: restoreReqError,
-            method: 'validateRestoreRequest',
-            xml,
-        });
-        return cb(restoreReqError);
-    }
-    // If do not specify Tier, set "Standard"
-    return cb(null, {
-        days: Number.parseInt(restoreRequest.Days, 10),
-        tier: restoreRequest.Tier && restoreRequest.Tier[0] ? restoreRequest.Tier[0] : 'Standard',
-    });
-}
-
-/**
- * convertToXml - Convert restore request info object to xml
- * @param days - restore days
- * @param tier - restore tier
- * @return - returns restore request information xml string
- */
-export function convertToXml(days: string, tier: string) {
-    if (!(days && tier)) {
-        return '';
-    }
-    return [
-        '<RestoreRequest xmlns="http://s3.amazonaws.com/doc/2006-03-01/">',
-        `<Days>${days}</Days>`,
-        `<Tier>${tier}</Tier>`,
-        '</RestoreRequest>',
-    ].join('');
-}
--- a/lib/s3middleware/objectUtils.ts
+++ b/lib/s3middleware/objectUtils.ts
@ -1,21 +1,5 @@
-const msInOneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.
-
-export const getMD5Buffer = (base64MD5: WithImplicitCoercion<string> | Uint8Array) =>
-    base64MD5 instanceof Uint8Array ? base64MD5 : Buffer.from(base64MD5, 'base64')
-
-export const getHexMD5 = (base64MD5: WithImplicitCoercion<string> | Uint8Array) =>
-    getMD5Buffer(base64MD5).toString('hex');
+export const getHexMD5 = (base64MD5: WithImplicitCoercion<string>) =>
+    Buffer.from(base64MD5, 'base64').toString('hex');

 export const getBase64MD5 = (hexMD5: WithImplicitCoercion<string>) =>
    Buffer.from(hexMD5, 'hex').toString('base64');
-
-
-/**
- * Calculates the number of scaled milliseconds per day based on the given time progression factor.
- * This function is intended for testing and simulation purposes only.
- * @param {number} timeProgressionFactor - The desired time progression factor for scaling.
- * @returns {number} The number of scaled milliseconds per day.
- * If the result is 0, the minimum value of 1 millisecond is returned.
- */
-export const scaleMsPerDay = (timeProgressionFactor: number): number =>
-    Math.round(msInOneDay / (timeProgressionFactor || 1)) || 1;
--- a/lib/s3middleware/tagging.ts
+++ b/lib/s3middleware/tagging.ts
@ -3,11 +3,6 @@ import * as werelogs from 'werelogs';
 import errors, { ArsenalError } from '../errors';
 import escapeForXml from './escapeForXml';

-export interface BucketTag {
-    Key: string;
-    Value: string;
-};
-
 const errorInvalidArgument = () => errors.InvalidArgument
    .customizeDescription('The header \'x-amz-tagging\' shall be ' +
  'encoded as UTF-8 then URLEncoded URL query parameters without ' +
@ -37,15 +32,6 @@ export const _validator = {
        && tag.Key[0] !== undefined && tag.Value[0] !== undefined
        && typeof tag.Key[0] === 'string' && typeof tag.Value[0] === 'string',

-    // Allowed characters are letters, whitespace, and numbers, plus
-    // the following special characters: + - = . _ : /
-    // Maximum key length: 128 Unicode characters
-    // Maximum value length: 256 Unicode characters
-    validateTagObjectStructure: (tag: BucketTag) => tag
-        && Object.keys(tag).length === 2
-        && typeof tag.Key === 'string' && typeof tag.Value === 'string'
-        && tag.Key.length >= 1 && tag.Value.length >= 1,
-
    validateXMLStructure: (result: any) =>
        result && Object.keys(result).length === 1 &&
        result.Tagging &&
@ -114,47 +100,12 @@ function _validateTags(tags: Array<{ Key: string[], Value: string[] }>) {
    }
    // not repeating keys
    if (tags.length > Object.keys(tagsResult).length) {
-        return errors.InvalidTag.customizeDescription(
-            'Cannot provide multiple Tags with the same key'
-        );
+        return errors.InvalidTag.customizeDescription('Cannot provide ' +
+        'multiple Tags with the same key');
    }
    return tagsResult;
 }

-/** areTagsValid - Validate bucket tags
-* @param tags - tags parsed from xml to be validated
-* @return result - true if the tags are valide, false otherwise
-*/
-export function areTagsValid(tags: Array<BucketTag>) {
-    if (tags.length === 0) {
-        return true;
-    }
-    // Maximum number of tags per resource: 50
-    if (tags.length > 50) {
-        return false;
-    }
-
-    const tagsResult = {};
-    for (const tag of tags) {
-        if (!_validator.validateTagObjectStructure(tag)) {
-            return false;
-        }
-        const { Key: key, Value: value } = tag;
-
-        const result = _validator.validateKeyValue(key, value);
-        if (result instanceof Error) {
-            return false;
-        }
-
-        tagsResult[key] = value;
-    }
-    // not repeating keys
-    if (tags.length > Object.keys(tagsResult).length) {
-        return false;
-    }
-    return true;
-}
-
 /** parseTagXml - Parse and validate xml body, returning callback with object
 * tags : { key: value}
 * @param xml - xml body to parse and validate
--- a/lib/s3middleware/validateConditionalHeaders.ts
+++ b/lib/s3middleware/validateConditionalHeaders.ts
@ -77,34 +77,6 @@ export function _checkUnmodifiedSince(
    return { present: false, error: null };
 }

-/**
- * checks 'if-modified-since' and 'if-unmodified-since' headers if included in
- * request against last-modified date of object
- * @param headers - headers from request object
- * @param lastModified - last modified date of object
- * @return contains modifiedSince and unmodifiedSince res objects
- */
-export function checkDateModifiedHeaders(
-    headers: http.IncomingHttpHeaders,
-    lastModified: string,
-) {
-    const lastModifiedDate = new Date(lastModified);
-    lastModifiedDate.setMilliseconds(0);
-    const millis = lastModifiedDate.getTime();
-
-    const ifModifiedSinceHeader = headers['if-modified-since'] ||
-        headers['x-amz-copy-source-if-modified-since'];
-    const ifUnmodifiedSinceHeader = headers['if-unmodified-since'] ||
-        headers['x-amz-copy-source-if-unmodified-since'];
-
-    const modifiedSinceRes = _checkModifiedSince(ifModifiedSinceHeader?.toString(),
-        millis);
-    const unmodifiedSinceRes = _checkUnmodifiedSince(ifUnmodifiedSinceHeader?.toString(),
-        millis);
-
-    return { modifiedSinceRes, unmodifiedSinceRes };
-}
-
 /**
 * validateConditionalHeaders - validates 'if-modified-since',
 * 'if-unmodified-since', 'if-match' or 'if-none-match' headers if included in
@ -120,14 +92,21 @@ export function validateConditionalHeaders(
    lastModified: string,
    contentMD5: string,
 ): {} | { present: boolean; error: ArsenalError } {
+    const lastModifiedDate = new Date(lastModified);
+    lastModifiedDate.setMilliseconds(0);
+    const millis = lastModifiedDate.getTime();
    const ifMatchHeader = headers['if-match'] ||
        headers['x-amz-copy-source-if-match'];
    const ifNoneMatchHeader = headers['if-none-match'] ||
        headers['x-amz-copy-source-if-none-match'];
+    const ifModifiedSinceHeader = headers['if-modified-since'] ||
+        headers['x-amz-copy-source-if-modified-since'];
+    const ifUnmodifiedSinceHeader = headers['if-unmodified-since'] ||
+        headers['x-amz-copy-source-if-unmodified-since'];
    const etagMatchRes = _checkEtagMatch(ifMatchHeader?.toString(), contentMD5);
    const etagNoneMatchRes = _checkEtagNoneMatch(ifNoneMatchHeader?.toString(), contentMD5);
-    const { modifiedSinceRes, unmodifiedSinceRes } =
-        checkDateModifiedHeaders(headers, lastModified);
+    const modifiedSinceRes = _checkModifiedSince(ifModifiedSinceHeader?.toString(), millis);
+    const unmodifiedSinceRes = _checkUnmodifiedSince(ifUnmodifiedSinceHeader?.toString(), millis);
    // If-Unmodified-Since condition evaluates to false and If-Match
    // is not present, then return the error. Otherwise, If-Unmodified-Since is
    // silent when If-Match match, and when If-Match does not match, it's the
--- a/lib/s3routes/routes.ts
+++ b/lib/s3routes/routes.ts
@ -1,7 +1,4 @@
 import assert from 'assert';
-
-import { RequestLogger } from 'werelogs';
-
 import errors from '../errors';
 import routeGET from './routes/routeGET';
 import routePUT from './routes/routePUT';
@ -13,7 +10,7 @@ import * as routesUtils from './routesUtils';
 import routeWebsite from './routes/routeWebsite';
 import * as http from 'http';
 import StatsClient from '../metrics/StatsClient';
-import { objectKeyByteLimit } from '../constants';
+
 import * as requestUtils from '../../lib/policyEvaluator/requestUtils';

 const routeMap = {
@ -67,14 +64,8 @@ function checkBucketAndKey(
            blacklistedPrefixes.object);
        if (!result.isValid) {
            log.debug('invalid object key', { objectKey });
-            if (result.invalidPrefix) {
-                return errors.InvalidArgument.customizeDescription('Invalid ' +
-                    'prefix - object key cannot start with ' +
-                    `"${result.invalidPrefix}".`);
-            }
-            return errors.KeyTooLong.customizeDescription('Object key is too ' +
-                'long. Maximum number of bytes allowed in keys is ' +
-                `${objectKeyByteLimit}.`);
+            return errors.InvalidArgument.customizeDescription('Object key ' +
+            `must not start with "${result.invalidPrefix}".`);
        }
    }
    if ((reqQuery.partNumber || reqQuery.uploadId)
@ -219,8 +210,7 @@ export default function routes(
        // @ts-ignore
        logger.newRequestLogger());

-    if (!req.url!.startsWith('/_/healthcheck') &&
-        !req.url!.startsWith('/_/report')) {
+    if (!req.url!.startsWith('/_/healthcheck')) {
        log.info('received request', clientInfo);
    }

--- a/lib/s3routes/routes/routeDELETE.ts
+++ b/lib/s3routes/routes/routeDELETE.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import StatsClient from '../../metrics/StatsClient';
@ -43,8 +41,6 @@ export default function routeDELETE(
            return call('bucketDeleteEncryption');
        } else if (query?.tagging !== undefined) {
            return call('bucketDeleteTagging');
-        } else if (query?.quota !== undefined) {
-            return call('bucketDeleteQuota');
        }
        call('bucketDelete');
    } else {
--- a/lib/s3routes/routes/routeGET.ts
+++ b/lib/s3routes/routes/routeGET.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
@ -58,10 +56,6 @@ export default function routerGET(
            call('bucketGetNotification');
        } else if (query.encryption !== undefined) {
            call('bucketGetEncryption');
-        } else if (query.search !== undefined) {
-            call('metadataSearch')
-        } else if (query.quota !== undefined) {
-            call('bucketGetQuota');
        } else {
            // GET bucket
            call('bucketGet');
--- a/lib/s3routes/routes/routeHEAD.ts
+++ b/lib/s3routes/routes/routeHEAD.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import StatsClient from '../../metrics/StatsClient';
--- a/lib/s3routes/routes/routeOPTIONS.ts
+++ b/lib/s3routes/routes/routeOPTIONS.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
bert-e	5bef996cc0	Merge branch 'bugfix/ARSN-347/revert-commit' into tmp/octopus/w/7.70/bugfix/ARSN-347/revert-commit	2023-06-08 12:23:43 +00:00
Nicolas Humbert	7db4845b73	Revert "bf: ARSN-340 bump socket.io dep to 4.6.1" This reverts commit `af3fd17ec2`.	2023-06-08 07:55:56 -04:00