ARSN-418 bump package version

bugfix: ARSN-278 handle getting versionId when object is versioning suspended
When replicating a versioning suspended object, we need to specify 'null' as the encoded versionId as the versionId contained within the object's metadata is strictly internal In the replication processor we use getVersionId() when putting/deleting a tag. It's used by the mongoClient to fetch the object from MongoDB, here again we need to specify 'null' to get the versioning suspended object (cloudserver already knows how to handle 'null' versionId and transforms it to undefined before giving it to the mongoClient) (cherry picked from commit d1cd7e8dba) (cherry picked from commit f13a5d79ea)
2024-06-18 13:55:04 +02:00 · 2024-06-18 13:53:25 +02:00
202 changed files with 9551 additions and 25235 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 @@
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-<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>
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-</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"/>
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-<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>
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-<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">
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-<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>
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-<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"/>
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-<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"/>
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-<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 +33,24 @@ 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,
+        DelimiterCurrent: require('./lib/algos/list/delimiterCurrent').DelimiterCurrent,
+        DelimiterNonCurrent: require('./lib/algos/list/delimiterNonCurrent').DelimiterNonCurrent,
+        DelimiterOrphanDeleteMarker: require('./lib/algos/list/delimiterOrphanDeleteMarker').DelimiterOrphanDeleteMarker,
+    },
    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 +67,6 @@ export const policies = {
    RequestContext,
    requestUtils,
    actionMaps,
-    actionNeedQuotaCheck,
-    actionWithDataDeletion,
-    actionNeedQuotaCheckCopy,
 };

 export const testing = {
@ -85,7 +79,6 @@ export const s3middleware = {
    escapeForXml,
    objectLegalHold,
    tagging,
-    checkDateModifiedHeaders,
    validateConditionalHeaders,
    MD5Sum,
    NullStream,
@ -95,10 +88,8 @@ export const s3middleware = {
        ResultsCollector,
        SubStreamInterface,
    },
-    prepareStream,
    processMpuParts,
    retention,
-    objectRestore,
    lifecycleHelpers,
 };

@ -169,7 +160,3 @@ 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
@ -69,16 +69,11 @@ class DelimiterCurrent extends DelimiterMaster {
        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 {
+    addContents(key, value) {
+        if (this._reachedMaxKeys()) {
+            return FILTER_END;
+        }
+
        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
            this.IsTruncated = true;
            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
@ -86,12 +81,8 @@ class DelimiterCurrent extends DelimiterMaster {
                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
                    scannedKeys: this.scannedKeys,
                });
-            return true;
+            return FILTER_END;
        }
-        return super._reachedMaxKeys();
-    }
-
-    addContents(key, value) {
        ++this.scannedKeys;
        const parsedValue = this._parse(value);
        // if parsing fails, skip the key.
@ -102,23 +93,25 @@ class DelimiterCurrent extends DelimiterMaster {
            // "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);
+                return 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;
+            this.NextMarker = key;
        }
+
+        return FILTER_ACCEPT;
    }

-    result(): object {
+    result(): ResultObject {
        const result: ResultObject = {
            Contents: this.Contents,
            IsTruncated: this.IsTruncated,
        };

        if (this.IsTruncated) {
-            result.NextMarker = this.nextMarker;
+            result.NextMarker = this.NextMarker;
        }

        return result;
--- 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
@ -52,8 +52,9 @@ class DelimiterNonCurrent extends DelimiterVersions {
    // 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) {
+    keyHandler_SkippingVersions(key, value) {
+        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 = versionId;
@ -65,7 +66,7 @@ class DelimiterNonCurrent extends DelimiterVersions {
        this.setState({
            id: 1 /* NotSkipping */,
        });
-        return this.handleKey(key, versionId, value);
+        return this.handleKey(key, value);
    }

    filter(obj) {
@ -102,7 +103,7 @@ class DelimiterNonCurrent extends DelimiterVersions {
     *  @param {String} value - The value of the key
     *  @return {undefined}
     */
-    addVersion(key, versionId, value) {
+    addContents(key, versionId, value) {
        this.nextKeyMarker = key;
        this.nextVersionIdMarker = versionId;

@ -130,7 +131,7 @@ class DelimiterNonCurrent extends DelimiterVersions {
                    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.Contents.push({ key, value: s });
                        ++this.keys;
                    }
                }
--- a/lib/algos/list/delimiterOrphanDeleteMarker.js
+++ b/lib/algos/list/delimiterOrphanDeleteMarker.js
@ -64,7 +64,7 @@ class DelimiterOrphanDeleteMarker extends DelimiterVersions {
            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.Contents.push({ key: this.keyName, value: s });
                this.nextKeyMarker = this.keyName;
                ++this.keys;
            }
@ -148,7 +148,7 @@ class DelimiterOrphanDeleteMarker extends DelimiterVersions {
     *  @param {String} value - The value of the key
     *  @return {undefined}
     */
-    addVersion(key, versionId, value) {
+    addContents(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.
@ -189,7 +189,7 @@ class DelimiterOrphanDeleteMarker extends DelimiterVersions {
        }

        const result = {
-            Contents: this.Versions,
+            Contents: this.Contents,
            IsTruncated: this.IsTruncated,
        };

--- 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/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 +122,8 @@ 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
@ -1,4 +1,3 @@
-import * as crypto from 'crypto';
 import * as constants from '../constants';
 import * as VersionIDUtils from '../versioning/VersionID';
 import { VersioningConstants } from '../versioning/constants';
@ -6,8 +5,6 @@ import ObjectMDLocation, {
    ObjectMDLocationData,
    Location,
 } from './ObjectMDLocation';
-import ObjectMDAmzRestore from './ObjectMDAmzRestore';
-import ObjectMDArchive from './ObjectMDArchive';

 export type ACL = {
    Canned: string;
@ -32,7 +29,6 @@ export type ReplicationInfo = {
    role: string;
    storageType: string;
    dataStoreVersionId: string;
-    isNFS: boolean | null;
 };

 export type ObjectMDData = {
@ -40,26 +36,24 @@ 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 +73,6 @@ 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 +101,9 @@ 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 +158,6 @@ 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 +170,6 @@ 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 +179,6 @@ 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 +198,9 @@ export default class ObjectMD {
                role: '',
                storageType: '',
                dataStoreVersionId: '',
-                isNFS: null,
            },
            dataStoreName: '',
            originOp: '',
-            deleted: false,
-            isPHD: false,
        };
    }

@ -462,50 +430,6 @@ 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 +570,6 @@ 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 +675,6 @@ 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 +781,6 @@ 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
     *
@ -1014,20 +860,6 @@ 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 +875,6 @@ export default class ObjectMD {
        role: string;
        storageType?: string;
        dataStoreVersionId?: string;
-        isNFS?: boolean;
    }) {
        const {
            status,
@ -1054,7 +885,6 @@ export default class ObjectMD {
            role,
            storageType,
            dataStoreVersionId,
-            isNFS,
        } = replicationInfo;
        this._data.replicationInfo = {
            status,
@ -1065,7 +895,6 @@ export default class ObjectMD {
            role,
            storageType: storageType || '',
            dataStoreVersionId: dataStoreVersionId || '',
-            isNFS: isNFS || null,
        };
        return this;
    }
@ -1084,24 +913,6 @@ 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 +963,6 @@ 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 +1044,6 @@ 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 +1053,6 @@ 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 +1064,6 @@ 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 +1144,4 @@ 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 +90,6 @@ export class ProbeServer extends httpServer {
            return;
        }

-        this._handlers.get(req.url ?? '')?.(res, log);
+        this._handlers.get(req.url!)!(res, log);
    }
 }
--- 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/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: `${l.name}-cosmos-pfsd`,
-                                port: 80,
-                            },
-                        };
-                    }
-                    break;
-                case 'location-scality-hdclient-v2':
-                    location.type = 'scality';
-                    if (l.details && l.details.bootstrapList) {
-                        location.details = {
-                            supportsVersioning: true,
-                            connector: {
-                                hdclient: {
-                                    bootstrap: l.details.bootstrapList,
-                                },
-                            },
-                        };
-                    }
-                    break;
-                default:
-                    log.info('unknown location type', {
-                        locationType: l.locationType,
-                    });
-                    return acc;
-            }
-            return { ...acc, [location.name]: location };
-        },
-        {}
-    );
-}
--- a/lib/policy/userPolicySchema.json
+++ b/lib/policy/userPolicySchema.json
@ -38,10 +38,6 @@
            "type": "string",
            "pattern": "^arn:aws:iam::[0-9]{12}:saml-provider/[\\w._-]{1,128}$"
        },
-        "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/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/lib/s3routes/routes/routePOST.ts
+++ b/lib/s3routes/routes/routePOST.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
@ -58,14 +56,6 @@ export default function routePOST(
                    corsHeaders));
    }

-    // POST Object restore
-    if (query.restore !== undefined) {
-        return api.callApiMethod('objectRestore', request, response,
-            log, (err, statusCode, resHeaders) =>
-                routesUtils.responseNoBody(err, resHeaders, response,
-                    statusCode, log));
-    }
-
    return routesUtils.responseNoBody(errors.NotImplemented, null, response,
        200, log);
 }
--- a/lib/s3routes/routes/routePUT.ts
+++ b/lib/s3routes/routes/routePUT.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
@ -105,13 +103,6 @@ export default function routePUT(
                    return routesUtils.responseNoBody(err, corsHeaders,
                        response, 200, log);
                });
-        } else if (query.quota !== undefined) {
-            api.callApiMethod('bucketUpdateQuota', request, response,
-                log, (err, resHeaders) => {
-                    routesUtils.statsReport500(err, statsClient);
-                    return routesUtils.responseNoBody(err, resHeaders, response,
-                        200, log);
-                });
        } else {
            // PUT bucket
            return api.callApiMethod('bucketPut', request, response, log,
--- a/lib/s3routes/routes/routeWebsite.ts
+++ b/lib/s3routes/routes/routeWebsite.ts
@ -1,5 +1,3 @@
-import { RequestLogger } from 'werelogs';
-
 import * as routesUtils from '../routesUtils';
 import errors from '../../errors';
 import * as http from 'http';
@ -11,7 +9,7 @@ export default function routerWebsite(
    api: { callApiMethod: routesUtils.CallApiMethod },
    log: RequestLogger,
    statsClient?: StatsClient,
-    dataRetrievalParams?: any,
+    dataRetrievalFn?: any,
 ) {
    const { bucketName, query } = request as any
    log.debug('routing request', { method: 'routerWebsite' });
@ -29,11 +27,6 @@ export default function routerWebsite(
                routesUtils.statsReport500(err, statsClient);
                // request being redirected
                if (redirectInfo) {
-                    if (err && redirectInfo.withError) {
-                        return routesUtils.redirectRequestOnError(err,
-                            'GET', redirectInfo, dataGetInfo, dataRetrievalParams,
-                            response, resMetaHeaders, log)
-                    }
                    // note that key might have been modified in websiteGet
                    // api to add index document
                    return routesUtils.redirectRequest(redirectInfo,
@ -45,7 +38,7 @@ export default function routerWebsite(
                // user has their own error page
                if (err && dataGetInfo) {
                    return routesUtils.streamUserErrorPage(err, dataGetInfo,
-                        dataRetrievalParams, response, resMetaHeaders, log);
+                        dataRetrievalFn, response, resMetaHeaders, log);
                }
                // send default error html response
                if (err) {
@ -55,7 +48,7 @@ export default function routerWebsite(
                }
                // no error, stream data
                return routesUtils.responseStreamData(null, query,
-                    resMetaHeaders, dataGetInfo, dataRetrievalParams, response,
+                    resMetaHeaders, dataGetInfo, dataRetrievalFn, response,
                    undefined, log);
            });
    }
@ -64,11 +57,6 @@ export default function routerWebsite(
            (err, resMetaHeaders, redirectInfo, key) => {
                routesUtils.statsReport500(err, statsClient);
                if (redirectInfo) {
-                    if (err && redirectInfo.withError) {
-                        return routesUtils.redirectRequestOnError(err,
-                            'HEAD', redirectInfo, null, dataRetrievalParams,
-                            response, resMetaHeaders, log)
-                    }
                    return routesUtils.redirectRequest(redirectInfo,
                        // TODO ARSN-217 encrypted does not exists in request.connection
                        // @ts-ignore
--- a/lib/s3routes/routesUtils.ts
+++ b/lib/s3routes/routesUtils.ts
@ -1,16 +1,11 @@
 import * as url from 'url';
-import * as http from 'http';
-import { eachSeries } from 'async';
-
-import { RequestLogger } from 'werelogs';
-
 import * as ipCheck from '../ipCheck';
 import errors, { ArsenalError } from '../errors';
 import * as constants from '../constants';
+import { eachSeries } from 'async';
 import DataWrapper from '../storage/data/DataWrapper';
+import * as http from 'http';
 import StatsClient from '../metrics/StatsClient';
-import { objectKeyByteLimit } from '../constants';
-const jsutil = require('../jsutil');

 export type CallApiMethod = (
    methodName: string,
@ -149,15 +144,6 @@ const XMLResponseBackend = {
            '<Error>',
                `<Code>${errCode.message}</Code>`,
                `<Message>${errCode.description}</Message>`,
-        );
-        const invalidArguments = errCode.metadata.get('invalidArguments') || [];
-        invalidArguments.forEach((invalidArgument, index) => {
-            const counter = index + 1;
-            const { ArgumentName, ArgumentValue } = invalidArgument as any;
-            xml.push(`<ArgumentName${counter}>${ArgumentName}</ArgumentName${counter}>`);
-            xml.push(`<ArgumentValue${counter}>${ArgumentValue}</ArgumentValue${counter}>`);
-        });
-        xml.push(
                '<Resource></Resource>',
                `<RequestId>${log.getSerializedUids()}</RequestId>`,
            '</Error>',
@ -227,18 +213,9 @@ const JSONResponseBackend = {
            "requestId": "4442587FB7D0A2F9"
        }
        */
-        const invalidArguments = errCode.metadata.get('invalidArguments') || [];
-        const invalids = invalidArguments.reduce((acc, invalidArgument, index) => {
-            const counter = index + 1;
-            const { ArgumentName, ArgumentValue } = invalidArgument as any;
-            const name = `ArgumentName${counter}`;
-            const value = `ArgumentValue${counter}`;
-            return { ...acc, [name]: ArgumentName, [value]: ArgumentValue };
-        }, {});
        const data = JSON.stringify({
            code: errCode.message,
            message: errCode.description,
-            ...invalids,
            resource: null,
            requestId: log.getSerializedUids(),
        });
@ -385,18 +362,12 @@ function retrieveData(
        response.destroy();
        responseDestroyed = true;
    };
-
-    const _destroyReadable = (readable: http.IncomingMessage | null) => {
-        // s3-data sends Readable stream only which does not implement destroy
-        if (readable && readable.destroy) {
-            readable.destroy();
-        }
-    };
-
    // the S3-client might close the connection while we are processing it
    response.once('close', () => {
        responseDestroyed = true;
-        _destroyReadable(currentStream);
+        if (currentStream) {
+            currentStream.destroy();
+        }
    });

    const {
@ -413,7 +384,6 @@ function retrieveData(
    return eachSeries(locations,
        (current, next) => data.get(current, response, log,
            (err: any, readable: http.IncomingMessage) => {
-                const cbOnce = jsutil.once(next);
                // NB: readable is of IncomingMessage type
                if (err) {
                    log.error('failed to get object', {
@ -421,7 +391,7 @@ function retrieveData(
                        method: 'retrieveData',
                    });
                    _destroyResponse();
-                    return cbOnce(err);
+                    return next(err);
                }
                // response.isclosed is set by the S3 server. Might happen if
                // the S3-client closes the connection before the first request
@ -430,24 +400,24 @@ function retrieveData(
                if (responseDestroyed || response.isclosed) {
                    log.debug(
                        'response destroyed before readable could stream');
-                    _destroyReadable(readable);
+                    readable.destroy();
                    const responseErr = new Error();
                    // @ts-ignore
                    responseErr.code = 'ResponseError';
                    responseErr.message = 'response closed by client request before all data sent';
-                    return cbOnce(responseErr);
+                    return next(responseErr);
                }
                // readable stream successfully consumed
                readable.on('end', () => {
                    currentStream = null;
                    log.debug('readable stream end reached');
-                    return cbOnce();
+                    return next();
                });
                // errors on server side with readable stream
                readable.on('error', err => {
                    log.error('error piping data from source');
                    _destroyResponse();
-                    return cbOnce(err);
+                    return next(err);
                });
                currentStream = readable;
                return readable.pipe(response, { end: false });
@ -694,8 +664,6 @@ export function streamUserErrorPage(
    log: RequestLogger,
 ) {
    setCommonResponseHeaders(corsHeaders, response, log);
-    response.setHeader('x-amz-error-code', err.message);
-    response.setHeader('x-amz-error-message', err.description);
    response.writeHead(err.code, { 'Content-type': 'text/html' });
    response.on('finish', () => {
        // TODO ARSN-216 Fix logger
@ -878,7 +846,7 @@ export function redirectRequest(
    }
    let redirectLocation = justPath ? `/${redirectKey}` :
        `${redirectProtocol}://${redirectHostName}/${redirectKey}`;
-    if (!redirectKey && redirectLocationHeader && redirectLocation !== '/') {
+    if (!redirectKey && redirectLocationHeader) {
        // remove hanging slash
        redirectLocation = redirectLocation.slice(0, -1);
    }
@ -895,52 +863,6 @@ export function redirectRequest(
    return undefined;
 }

-/**
- * redirectRequestOnError - redirect with an error body
- * @param err - arsenal error object
- * @param method - HTTP method
- * @param routingInfo - info for routing
- * @param [routingInfo.withError] - flag to differentiate from routing rules
- * @param [routingInfo.location] - location header
- * @param dataLocations --
- *   - array of locations to get streams from backend
- * @param retrieveDataParams - params to create instance of
- * data retrieval function
- * @param response - response object
- * @param corsHeaders - CORS-related response headers
- * @param log - Werelogs instance
- */
-export function redirectRequestOnError(
-    err: ArsenalError,
-    method: 'HEAD' | 'GET',
-    routingInfo: {
-        withError: true;
-        location: string;
-    },
-    dataLocations: { size: string | number }[] | null,
-    retrieveDataParams: any,
-    response: http.ServerResponse,
-    corsHeaders: { [key: string]: string },
-    log: RequestLogger,
-) {
-    response.setHeader('Location', routingInfo.location);
-
-    if (!dataLocations && err.is.Found) {
-        if (method === 'HEAD') {
-            return errorHeaderResponse(err, response, corsHeaders, log);
-        }
-        response.setHeader('x-amz-error-code', err.message);
-        response.setHeader('x-amz-error-message', err.description);
-        return errorHtmlResponse(err, false, '', response, corsHeaders, log);
-    }
-
-    // This is reached only for website error document (GET only)
-    const overrideErrorCode = err.flatten();
-    overrideErrorCode.code = 301;
-    return streamUserErrorPage(ArsenalError.unflatten(overrideErrorCode)!,
-        dataLocations || [], retrieveDataParams, response, corsHeaders, log);
-}
-
 /**
 * Get bucket name and object name from the request
 * @param request - http request object
@ -1155,9 +1077,6 @@ export function isValidObjectKey(objectKey: string, prefixBlacklist: string[]) {
    if (invalidPrefix) {
        return { isValid: false, invalidPrefix };
    }
-    if (Buffer.byteLength(objectKey, 'utf8') > objectKeyByteLimit) {
-        return { isValid: false };
-    }
    return { isValid: true };
 }

--- a/Show More
+++ b/Show More