test

2022-09-14 12:22:14 +02:00 · 2022-09-07 11:18:30 +02:00 · 2022-09-07 10:56:53 +02:00
223 changed files with 10195 additions and 30764 deletions
--- a/.eslintrc
+++ b/.eslintrc
@ -1,6 +1 @@
-{
+{ "extends": "scality" }
    "extends": "scality",
    "parserOptions": {
        "ecmaVersion": 2020
    }
 }
--- a/.github/workflows/codeql.yaml
+++ b/.github/workflows/codeql.yaml
@ -1,25 +0,0 @@
 ---
 name: codeQL
 on:
  push:
    branches: [development/*, stabilization/*, hotfix/*]
  pull_request:
    branches: [development/*, stabilization/*, hotfix/*]
  workflow_dispatch:
 jobs:
  analyze:
    name: Static analysis with CodeQL
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      - name: Initialize CodeQL
        uses: github/codeql-action/init@v3
        with:
          languages: javascript, typescript
      - name: Build and analyze
        uses: github/codeql-action/analyze@v3
--- a/.github/workflows/dependency-review.yaml
+++ b/.github/workflows/dependency-review.yaml
@ -1,16 +0,0 @@
 ---
 name: dependency review
 on:
  pull_request:
    branches: [development/*, stabilization/*, hotfix/*]
 jobs:
  dependency-review:
    runs-on: ubuntu-latest
    steps:
      - name: 'Checkout Repository'
        uses: actions/checkout@v4
      - name: 'Dependency Review'
        uses: actions/dependency-review-action@v4
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@ -8,7 +8,7 @@ on:
 jobs:
  test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
    services:
      # Label used to access the service container
      redis:
@ -25,30 +25,24 @@ jobs:
          - 6379:6379
    steps:
    - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v2
-    - uses: actions/setup-node@v4
+    - 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
+    - name: run unit tests
-      run: |
+      run: yarn test
        sudo sh -c "echo '127.0.0.1 testrequestbucket.localhost' >> /etc/hosts"
    - name: test and coverage
      run: yarn --silent coverage
    - 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/delimiterVersions.md
+++ b/documentation/listingAlgos/delimiterVersions.md
@ -1,33 +0,0 @@
 # DelimiterVersions
 The DelimiterVersions 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 "Versions" and "CommonPrefixes" as a
 result.
 ## Expected Behavior
 - lists individual distinct versions of versioned buckets
 - 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 **keyMarker** and optionally a **versionIdMarker** to
  list from a specific key or version
 - can take a **maxKeys** parameter to limit how many keys can be returned
 - 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
 ![DelimiterVersions State Chart](./pics/delimiterVersionsStateChart.svg)
--- a/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
+++ b/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
@ -1,45 +0,0 @@
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  "SkippingVersions.Idle" [label="SkippingVersions",group="SkippingVersions"];
  "WaitVersionAfterPHD.Idle" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
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  "SkippingVersions.Processing" [label="SkippingVersions",group="SkippingVersions"];
  "WaitVersionAfterPHD.Processing" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
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  "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"]
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  "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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+++ b/documentation/listingAlgos/pics/delimiterVersionsStateChart.dot
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--- 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, {
+import RequestContext from './lib/policyEvaluator/RequestContext';
    actionNeedQuotaCheck,
    actionNeedQuotaCheckCopy,
    actionWithDataDeletion } 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';
@ -41,26 +33,27 @@ export * as stream from './lib/stream';
 export * as jsutil from './lib/jsutil';
 export { default as stringHash } from './lib/stringHash';
 export * as db from './lib/db';
 export * as errorUtils from './lib/errorUtils';
 export { default as shuffle } from './lib/shuffle';
 export * as models from './lib/models';
 export const algorithms = {
-    list: require('./lib/algos/list/exportAlgos'),
+    list: {
        Basic: require('./lib/algos/list/basic').List,
        Delimiter: require('./lib/algos/list/delimiter').Delimiter,
        DelimiterVersions: require('./lib/algos/list/delimiterVersions').DelimiterVersions,
        DelimiterMaster: require('./lib/algos/list/delimiterMaster').DelimiterMaster,
        MPU: require('./lib/algos/list/MPU').MultipartUploads,
    },
    listTools: {
        DelimiterTools: require('./lib/algos/list/tools'),
        Skip: require('./lib/algos/list/skip'),
    },
    cache: {
        GapSet: require('./lib/algos/cache/GapSet'),
        GapCache: require('./lib/algos/cache/GapCache'),
        LRUCache: require('./lib/algos/cache/LRUCache'),
    },
    stream: {
        MergeStream: require('./lib/algos/stream/MergeStream'),
    },
    SortedSet: require('./lib/algos/set/SortedSet'),
    Heap: require('./lib/algos/heap/Heap'),
 };
 export const policies = {
@ -70,9 +63,6 @@ export const policies = {
    RequestContext,
    requestUtils,
    actionMaps,
    actionNeedQuotaCheck,
    actionWithDataDeletion,
    actionNeedQuotaCheckCopy,
 };
 export const testing = {
@ -85,7 +75,6 @@ export const s3middleware = {
    escapeForXml,
    objectLegalHold,
    tagging,
    checkDateModifiedHeaders,
    validateConditionalHeaders,
    MD5Sum,
    NullStream,
@ -95,10 +84,8 @@ export const s3middleware = {
        ResultsCollector,
        SubStreamInterface,
    },
    prepareStream,
    processMpuParts,
    retention,
    objectRestore,
    lifecycleHelpers,
 };
@ -169,7 +156,3 @@ 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/heap/Heap.ts
+++ b/lib/algos/heap/Heap.ts
@ -1,124 +0,0 @@
 export enum HeapOrder {
    Min = -1,
    Max = 1,
 }
 export enum CompareResult {
    LT = -1,
    EQ = 0,
    GT = 1,
 }
 export type CompareFunction = (x: any, y: any) => CompareResult;
 export class Heap {
    size: number;
    _maxSize: number;
    _order: HeapOrder;
    _heap: any[];
    _cmpFn: CompareFunction;
    constructor(size: number, order: HeapOrder, cmpFn: CompareFunction) {
        this.size = 0;
        this._maxSize = size;
        this._order = order;
        this._cmpFn = cmpFn;
        this._heap = new Array<any>(this._maxSize);
    }
    _parent(i: number): number {
        return Math.floor((i - 1) / 2);
    }
    _left(i: number): number {
        return Math.floor((2 * i) + 1);
    }
    _right(i: number): number {
        return Math.floor((2 * i) + 2);
    }
    _shouldSwap(childIdx: number, parentIdx: number): boolean {
        return this._cmpFn(this._heap[childIdx], this._heap[parentIdx]) as number === this._order as number;
    }
    _swap(i: number, j: number) {
        const tmp = this._heap[i];
        this._heap[i] = this._heap[j];
        this._heap[j] = tmp;
    }
    _heapify(i: number) {
        const l = this._left(i);
        const r = this._right(i);
        let c = i;
        if (l < this.size && this._shouldSwap(l, c)) {
            c = l;
        }
        if (r < this.size && this._shouldSwap(r, c)) {
            c = r;
        }
        if (c != i) {
            this._swap(c, i);
            this._heapify(c);
        }
    }
    add(item: any): any {
        if (this.size >= this._maxSize) {
            return new Error('Max heap size reached');
        }
        ++this.size;
        let c = this.size - 1;
        this._heap[c] = item;
        while (c > 0) {
            if (!this._shouldSwap(c, this._parent(c))) {
                return null;
            }
            this._swap(c, this._parent(c));
            c = this._parent(c);
        }
        return null;
    };
    remove(): any {
        if (this.size <= 0) {
            return null;
        }
        const ret = this._heap[0];
        this._heap[0] = this._heap[this.size - 1];
        this._heapify(0);
        --this.size;
        return ret;
    };
    peek(): any {
        if (this.size <= 0) {
            return null;
        }
        return this._heap[0];
    };
 }
 export class MinHeap extends Heap {
    constructor(size: number, cmpFn: CompareFunction) {
        super(size, HeapOrder.Min, cmpFn);
    }
 }
 export class MaxHeap extends Heap {
    constructor(size: number, cmpFn: CompareFunction) {
        super(size, HeapOrder.Max, cmpFn);
    }
 } 
--- 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
+     *                    > 0: entry is accepted and included in the result
-     *                                   in the result
+     *                    = 0: entry is accepted but not included (skipping)
-     *                    FILTER_SKIP: listing may skip directly (with "gte" param) to
+     *                    < 0: entry is not accepted, listing should finish
     *                                 the key returned by the skipping() method
     *                    FILTER_END: the results are complete, listing can be stopped
     */
-    filter(/* entry: { key, value } */) {
+    filter(entry) {
-        return FILTER_ACCEPT;
+        return entry ? FILTER_SKIP : FILTER_SKIP;
    }
    /**
-     * Provides the next key at which the listing task is allowed to skip to.
+     * Provides the insight into why filter is skipping an entry. This could be
-     * This could allow to skip over:
+     * because it is skipping a range of delimited keys or a range of specific
-     * - a key prefix ending with the delimiter
+     * version when doing master version listing.
     * - 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
     *
-     * @return {string} - the next key at which the listing task is allowed to skip to
+     * @return {string} - the insight: a common prefix or a master key,
     *                                 or SKIP_NONE if there is no insight
     */
    skipping() {
        return SKIP_NONE;
--- a/lib/algos/list/MPU.js
+++ b/lib/algos/list/MPU.js
@ -1,7 +1,7 @@
 'use strict'; // eslint-disable-line strict
 const { inc, checkLimit, listingParamsMasterKeysV0ToV1,
-    FILTER_END, FILTER_ACCEPT, SKIP_NONE } = require('./tools');
+    FILTER_END, FILTER_ACCEPT } = require('./tools');
 const DEFAULT_MAX_KEYS = 1000;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
@ -163,7 +163,7 @@ class MultipartUploads {
    }
    skipping() {
-        return SKIP_NONE;
+        return '';
    }
    /**
--- a/lib/algos/list/basic.js
+++ b/lib/algos/list/basic.js
@ -2,7 +2,7 @@
 const Extension = require('./Extension').default;
-const { checkLimit, FILTER_END, FILTER_ACCEPT } = require('./tools');
+const { checkLimit, FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
 const DEFAULT_MAX_KEYS = 10000;
 /**
@ -91,7 +91,7 @@ class List extends Extension {
     *                     < 0 : listing done
     */
    filter(elem) {
-        // Check if the result array is full
+        // Check first in case of maxkeys <= 0
        if (this.keys >= this.maxKeys) {
            return FILTER_END;
        }
@ -99,7 +99,7 @@ class List extends Extension {
             this.filterKeyStartsWith !== undefined) &&
            typeof elem === 'object' &&
            !this.customFilter(elem.value)) {
-            return FILTER_ACCEPT;
+            return FILTER_SKIP;
        }
        if (typeof elem === 'object') {
            this.res.push({
--- a/lib/algos/list/delimiter.js
+++ b/lib/algos/list/delimiter.js
@ -0,0 +1,274 @@
 'use strict'; // eslint-disable-line strict
 const Extension = require('./Extension').default;
 const { inc, listingParamsMasterKeysV0ToV1,
    FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
 /**
 * Find the common prefix in the path
 *
 * @param {String} key            - path of the object
 * @param {String} delimiter      - separator
 * @param {Number} delimiterIndex - 'folder' index in the path
 * @return {String}               - CommonPrefix
 */
 function getCommonPrefix(key, delimiter, delimiterIndex) {
    return key.substring(0, delimiterIndex + delimiter.length);
 }
 /**
 * Handle object listing with parameters
 *
 * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
 * @prop {String[]} Contents           - 'files' to list
 * @prop {Boolean} IsTruncated         - truncated listing flag
 * @prop {String|undefined} NextMarker - marker per amazon format
 * @prop {Number} keys                 - count of listed keys
 * @prop {String|undefined} delimiter  - separator per amazon format
 * @prop {String|undefined} prefix     - prefix per amazon format
 * @prop {Number} maxKeys              - number of keys to list
 */
 class Delimiter extends Extension {
    /**
     * Create a new Delimiter instance
     * @constructor
     * @param {Object}  parameters                     - listing parameters
     * @param {String}  [parameters.delimiter]         - delimiter per amazon
     *                                                   format
     * @param {String}  [parameters.prefix]            - prefix per amazon
     *                                                   format
     * @param {String}  [parameters.marker]            - marker per amazon
     *                                                   format
     * @param {Number}  [parameters.maxKeys]           - number of keys to list
     * @param {Boolean} [parameters.v2]                - indicates whether v2
     *                                                   format
     * @param {String}  [parameters.startAfter]        - marker per amazon
     *                                                   format
     * @param {String}  [parameters.continuationToken] - obfuscated amazon
     *                                                   token
     * @param {Boolean} [parameters.alphabeticalOrder] - Either the result is
     *                                                   alphabetically ordered
     *                                                   or not
     * @param {RequestLogger} logger                   - The logger of the
     *                                                   request
     * @param {String} [vFormat]                       - versioning key format
     */
    constructor(parameters, logger, vFormat) {
        super(parameters, logger);
        // original listing parameters
        this.delimiter = parameters.delimiter;
        this.prefix = parameters.prefix;
        this.marker = parameters.marker;
        this.maxKeys = parameters.maxKeys || 1000;
        this.startAfter = parameters.startAfter;
        this.continuationToken = parameters.continuationToken;
        this.alphabeticalOrder =
          typeof parameters.alphabeticalOrder !== 'undefined' ?
              parameters.alphabeticalOrder : true;
        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
        // results
        this.CommonPrefixes = [];
        this.Contents = [];
        this.IsTruncated = false;
        this.NextMarker = parameters.marker;
        this.NextContinuationToken =
            parameters.continuationToken || parameters.startAfter;
        this.startMarker = parameters.v2 ? 'startAfter' : 'marker';
        this.continueMarker = parameters.v2 ? 'continuationToken' : 'marker';
        this.nextContinueMarker = parameters.v2 ?
            'NextContinuationToken' : 'NextMarker';
        if (this.delimiter !== undefined &&
            this[this.nextContinueMarker] !== undefined &&
            this[this.nextContinueMarker].startsWith(this.prefix || '')) {
            const nextDelimiterIndex =
                this[this.nextContinueMarker].indexOf(this.delimiter,
                    this.prefix ? this.prefix.length : 0);
            this[this.nextContinueMarker] =
                this[this.nextContinueMarker].slice(0, nextDelimiterIndex +
                                        this.delimiter.length);
        }
        Object.assign(this, {
            [BucketVersioningKeyFormat.v0]: {
                genMDParams: this.genMDParamsV0,
                getObjectKey: this.getObjectKeyV0,
                skipping: this.skippingV0,
            },
            [BucketVersioningKeyFormat.v1]: {
                genMDParams: this.genMDParamsV1,
                getObjectKey: this.getObjectKeyV1,
                skipping: this.skippingV1,
            },
        }[this.vFormat]);
    }
    genMDParamsV0() {
        const params = {};
        if (this.prefix) {
            params.gte = this.prefix;
            params.lt = inc(this.prefix);
        }
        const startVal = this[this.continueMarker] || this[this.startMarker];
        if (startVal) {
            if (params.gte && params.gte > startVal) {
                return params;
            }
            delete params.gte;
            params.gt = startVal;
        }
        return params;
    }
    genMDParamsV1() {
        const params = this.genMDParamsV0();
        return listingParamsMasterKeysV0ToV1(params);
    }
    /**
     * check if the max keys count has been reached and set the
     * final state of the result if it is the case
     * @return {Boolean} - indicates if the iteration has to stop
     */
    _reachedMaxKeys() {
        if (this.keys >= this.maxKeys) {
            // In cases of maxKeys <= 0 -> IsTruncated = false
            this.IsTruncated = this.maxKeys > 0;
            return true;
        }
        return false;
    }
    /**
     *  Add a (key, value) tuple to the listing
     *  Set the NextMarker to the current key
     *  Increment the keys counter
     *  @param {String} key   - The key to add
     *  @param {String} value - The value of the key
     *  @return {number}      - indicates if iteration should continue
     */
    addContents(key, value) {
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
        this.Contents.push({ key, value: this.trimMetadata(value) });
        this[this.nextContinueMarker] = key;
        ++this.keys;
        return FILTER_ACCEPT;
    }
    getObjectKeyV0(obj) {
        return obj.key;
    }
    getObjectKeyV1(obj) {
        return obj.key.slice(DbPrefixes.Master.length);
    }
    /**
     *  Filter to apply on each iteration, based on:
     *  - prefix
     *  - delimiter
     *  - maxKeys
     *  The marker is being handled directly by levelDB
     *  @param {Object} obj       - The key and value of the element
     *  @param {String} obj.key   - The key of the element
     *  @param {String} obj.value - The value of the element
     *  @return {number}          - indicates if iteration should continue
     */
    filter(obj) {
        const key = this.getObjectKey(obj);
        const value = obj.value;
        if ((this.prefix && !key.startsWith(this.prefix))
            || (this.alphabeticalOrder
                && typeof this[this.nextContinueMarker] === 'string'
                && key <= this[this.nextContinueMarker])) {
            return FILTER_SKIP;
        }
        if (this.delimiter) {
            const baseIndex = this.prefix ? this.prefix.length : 0;
            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
            if (delimiterIndex === -1) {
                return this.addContents(key, value);
            }
            return this.addCommonPrefix(key, delimiterIndex);
        }
        return this.addContents(key, value);
    }
    /**
     * Add a Common Prefix in the list
     * @param {String} key   - object name
     * @param {Number} index - after prefix starting point
     * @return {Boolean}     - indicates if iteration should continue
     */
    addCommonPrefix(key, index) {
        const commonPrefix = getCommonPrefix(key, this.delimiter, index);
        if (this.CommonPrefixes.indexOf(commonPrefix) === -1
                && this[this.nextContinueMarker] !== commonPrefix) {
            if (this._reachedMaxKeys()) {
                return FILTER_END;
            }
            this.CommonPrefixes.push(commonPrefix);
            this[this.nextContinueMarker] = commonPrefix;
            ++this.keys;
            return FILTER_ACCEPT;
        }
        return FILTER_SKIP;
    }
    /**
     * If repd happens to want to skip listing on a bucket in v0
     * versioning key format, here is an idea.
     *
     * @return {string} - the present range (NextMarker) if repd believes
     *                    that it's enough and should move on
     */
    skippingV0() {
        return this[this.nextContinueMarker];
    }
    /**
     * If repd happens to want to skip listing on a bucket in v1
     * versioning key format, here is an idea.
     *
     * @return {string} - the present range (NextMarker) if repd believes
     *                    that it's enough and should move on
     */
    skippingV1() {
        return DbPrefixes.Master + this[this.nextContinueMarker];
    }
    /**
     *  Return an object containing all mandatory fields to use once the
     *  iteration is done, doesn't show a NextMarker field if the output
     *  isn't truncated
     *  @return {Object} - following amazon format
     */
    result() {
        /* NextMarker is only provided when delimiter is used.
         * specified in v1 listing documentation
         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
         */
        const result = {
            CommonPrefixes: this.CommonPrefixes,
            Contents: this.Contents,
            IsTruncated: this.IsTruncated,
            Delimiter: this.delimiter,
        };
        if (this.parameters.v2) {
            result.NextContinuationToken = this.IsTruncated
                ? this.NextContinuationToken : undefined;
        } else {
            result.NextMarker = (this.IsTruncated && this.delimiter)
                ? this.NextMarker : undefined;
        }
        return result;
    }
 }
 module.exports = { Delimiter };
--- a/lib/algos/list/delimiter.ts
+++ b/lib/algos/list/delimiter.ts
@ -1,356 +0,0 @@
 'use strict'; // eslint-disable-line strict
 const Extension = require('./Extension').default;
 const { inc, listingParamsMasterKeysV0ToV1,
    FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
 export interface FilterState {
    id: number,
 };
 export interface FilterReturnValue {
    FILTER_ACCEPT,
    FILTER_SKIP,
    FILTER_END,
 };
 export const enum DelimiterFilterStateId {
    NotSkipping = 1,
    SkippingPrefix = 2,
 };
 export interface DelimiterFilterState_NotSkipping extends FilterState {
    id: DelimiterFilterStateId.NotSkipping,
 };
 export interface DelimiterFilterState_SkippingPrefix extends FilterState {
    id: DelimiterFilterStateId.SkippingPrefix,
    prefix: string;
 };
 type KeyHandler = (key: string, value: string) => FilterReturnValue;
 export type ResultObject = {
    CommonPrefixes: string[];
    Contents: {
        key: string;
        value: string;
    }[];
    IsTruncated: boolean;
    Delimiter ?: string;
    NextMarker ?: string;
    NextContinuationToken ?: string;
 };
 /**
 * Handle object listing with parameters
 *
 * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
 * @prop {String[]} Contents           - 'files' to list
 * @prop {Boolean} IsTruncated         - truncated listing flag
 * @prop {String|undefined} NextMarker - marker per amazon format
 * @prop {Number} keys                 - count of listed keys
 * @prop {String|undefined} delimiter  - separator per amazon format
 * @prop {String|undefined} prefix     - prefix per amazon format
 * @prop {Number} maxKeys              - number of keys to list
 */
 export class Delimiter extends Extension {
    state: FilterState;
    keyHandlers: { [id: number]: KeyHandler };
    /**
     * Create a new Delimiter instance
     * @constructor
     * @param {Object}  parameters                     - listing parameters
     * @param {String}  [parameters.delimiter]         - delimiter per amazon
     *                                                   format
     * @param {String}  [parameters.prefix]            - prefix per amazon
     *                                                   format
     * @param {String}  [parameters.marker]            - marker per amazon
     *                                                   format
     * @param {Number}  [parameters.maxKeys]           - number of keys to list
     * @param {Boolean} [parameters.v2]                - indicates whether v2
     *                                                   format
     * @param {String}  [parameters.startAfter]        - marker per amazon
     *                                                   format
     * @param {String}  [parameters.continuationToken] - obfuscated amazon
     *                                                   token
     * @param {RequestLogger} logger                   - The logger of the
     *                                                   request
     * @param {String} [vFormat]                       - versioning key format
     */
    constructor(parameters, logger, vFormat) {
        super(parameters, logger);
        // original listing parameters
        this.delimiter = parameters.delimiter;
        this.prefix = parameters.prefix;
        this.maxKeys = parameters.maxKeys || 1000;
        if (parameters.v2) {
            this.marker = parameters.continuationToken || parameters.startAfter;
        } else {
            this.marker = parameters.marker;
        }
        this.nextMarker = this.marker;
        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
        // results
        this.CommonPrefixes = [];
        this.Contents = [];
        this.IsTruncated = false;
        this.keyHandlers = {};
        Object.assign(this, {
            [BucketVersioningKeyFormat.v0]: {
                genMDParams: this.genMDParamsV0,
                getObjectKey: this.getObjectKeyV0,
                skipping: this.skippingV0,
            },
            [BucketVersioningKeyFormat.v1]: {
                genMDParams: this.genMDParamsV1,
                getObjectKey: this.getObjectKeyV1,
                skipping: this.skippingV1,
            },
        }[this.vFormat]);
        // if there is a delimiter, we may skip ranges by prefix,
        // hence using the NotSkippingPrefix flavor that checks the
        // subprefix up to the delimiter for the NotSkipping state
        if (this.delimiter) {
            this.setKeyHandler(
                DelimiterFilterStateId.NotSkipping,
                this.keyHandler_NotSkippingPrefix.bind(this));
        } else {
            // listing without a delimiter never has to skip over any
            // prefix -> use NeverSkipping flavor for the NotSkipping
            // state
            this.setKeyHandler(
                DelimiterFilterStateId.NotSkipping,
                this.keyHandler_NeverSkipping.bind(this));
        }
        this.setKeyHandler(
            DelimiterFilterStateId.SkippingPrefix,
            this.keyHandler_SkippingPrefix.bind(this));
        this.state = <DelimiterFilterState_NotSkipping> {
            id: DelimiterFilterStateId.NotSkipping,
        };
    }
    genMDParamsV0() {
        const params: { gt ?: string, gte ?: string, lt ?: string } = {};
        if (this.prefix) {
            params.gte = this.prefix;
            params.lt = inc(this.prefix);
        }
        if (this.marker && this.delimiter) {
            const commonPrefix = this.getCommonPrefix(this.marker);
            if (commonPrefix) {
                const afterPrefix = inc(commonPrefix);
                if (!params.gte || afterPrefix > params.gte) {
                    params.gte = afterPrefix;
                }
            }
        }
        if (this.marker && (!params.gte || this.marker >= params.gte)) {
            delete params.gte;
            params.gt = this.marker;
        }
        return params;
    }
    genMDParamsV1() {
        const params = this.genMDParamsV0();
        return listingParamsMasterKeysV0ToV1(params);
    }
    /**
     * check if the max keys count has been reached and set the
     * final state of the result if it is the case
     * @return {Boolean} - indicates if the iteration has to stop
     */
    _reachedMaxKeys(): boolean {
        if (this.keys >= this.maxKeys) {
            // In cases of maxKeys <= 0 -> IsTruncated = false
            this.IsTruncated = this.maxKeys > 0;
            return true;
        }
        return false;
    }
    /**
     *  Add a (key, value) tuple to the listing
     *  Set the NextMarker to the current key
     *  Increment the keys counter
     *  @param {String} key   - The key to add
     *  @param {String} value - The value of the key
     *  @return {number}      - indicates if iteration should continue
     */
    addContents(key: string, value: string): void {
        this.Contents.push({ key, value: this.trimMetadata(value) });
        ++this.keys;
        this.nextMarker = key;
    }
    getCommonPrefix(key: string): string | undefined {
        if (!this.delimiter) {
            return undefined;
        }
        const baseIndex = this.prefix ? this.prefix.length : 0;
        const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
        if (delimiterIndex === -1) {
            return undefined;
        }
        return key.substring(0, delimiterIndex + this.delimiter.length);
    }
    /**
     * Add a Common Prefix in the list
     * @param {String} commonPrefix   - common prefix to add
     * @param {String} key            - full key starting with commonPrefix
     * @return {Boolean}     - indicates if iteration should continue
     */
    addCommonPrefix(commonPrefix: string, key: string): void {
        // add the new prefix to the list
        this.CommonPrefixes.push(commonPrefix);
        ++this.keys;
        this.nextMarker = commonPrefix;
    }
    addCommonPrefixOrContents(key: string, value: string): string | undefined {
        // add the subprefix to the common prefixes if the key has the delimiter
        const commonPrefix = this.getCommonPrefix(key);
        if (commonPrefix) {
            this.addCommonPrefix(commonPrefix, key);
            return commonPrefix;
        }
        this.addContents(key, value);
        return undefined;
    }
    getObjectKeyV0(obj: { key: string }): string {
        return obj.key;
    }
    getObjectKeyV1(obj: { key: string }): string {
        return obj.key.slice(DbPrefixes.Master.length);
    }
    /**
     *  Filter to apply on each iteration, based on:
     *  - prefix
     *  - delimiter
     *  - maxKeys
     *  The marker is being handled directly by levelDB
     *  @param {Object} obj       - The key and value of the element
     *  @param {String} obj.key   - The key of the element
     *  @param {String} obj.value - The value of the element
     *  @return {number}          - indicates if iteration should continue
     */
    filter(obj: { key: string, value: string }): FilterReturnValue {
        const key = this.getObjectKey(obj);
        const value = obj.value;
        return this.handleKey(key, value);
    }
    setState(state: FilterState): void {
        this.state = state;
    }
    setKeyHandler(stateId: number, keyHandler: KeyHandler): void {
        this.keyHandlers[stateId] = keyHandler;
    }
    handleKey(key: string, value: string): FilterReturnValue {
        return this.keyHandlers[this.state.id](key, value);
    }
    keyHandler_NeverSkipping(key: string, value: string): FilterReturnValue {
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
        this.addContents(key, value);
        return FILTER_ACCEPT;
    }
    keyHandler_NotSkippingPrefix(key: string, value: string): FilterReturnValue {
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
        const commonPrefix = this.addCommonPrefixOrContents(key, value);
        if (commonPrefix) {
            // transition into SkippingPrefix state to skip all following keys
            // while they start with the same prefix
            this.setState(<DelimiterFilterState_SkippingPrefix> {
                id: DelimiterFilterStateId.SkippingPrefix,
                prefix: commonPrefix,
            });
        }
        return FILTER_ACCEPT;
    }
    keyHandler_SkippingPrefix(key: string, value: string): FilterReturnValue {
        const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
        if (key.startsWith(prefix)) {
            return FILTER_SKIP;
        }
        this.setState(<DelimiterFilterState_NotSkipping> {
            id: DelimiterFilterStateId.NotSkipping,
        });
        return this.handleKey(key, value);
    }
    skippingBase(): string | undefined {
        switch (this.state.id) {
        case DelimiterFilterStateId.SkippingPrefix:
            const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
            return inc(prefix);
        default:
            return SKIP_NONE;
        }
    }
    skippingV0() {
        return this.skippingBase();
    }
    skippingV1() {
        const skipTo = this.skippingBase();
        if (skipTo === SKIP_NONE) {
            return SKIP_NONE;
        }
        return DbPrefixes.Master + skipTo;
    }
    /**
     *  Return an object containing all mandatory fields to use once the
     *  iteration is done, doesn't show a NextMarker field if the output
     *  isn't truncated
     *  @return {Object} - following amazon format
     */
    result(): ResultObject {
        /* NextMarker is only provided when delimiter is used.
         * specified in v1 listing documentation
         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
         */
        const result: ResultObject = {
            CommonPrefixes: this.CommonPrefixes,
            Contents: this.Contents,
            IsTruncated: this.IsTruncated,
            Delimiter: this.delimiter,
        };
        if (this.parameters.v2) {
            result.NextContinuationToken = this.IsTruncated
                ? this.nextMarker : undefined;
        } else {
            result.NextMarker = (this.IsTruncated && this.delimiter)
                ? this.nextMarker : undefined;
        }
        return result;
    }
 }
--- a/lib/algos/list/delimiterCurrent.ts
+++ b/lib/algos/list/delimiterCurrent.ts
@ -1,127 +0,0 @@
 const { DelimiterMaster } = require('./delimiterMaster');
 const { FILTER_ACCEPT, FILTER_END } = require('./tools');
 type ResultObject = {
    Contents: {
        key: string;
        value: string;
    }[];
    IsTruncated: boolean;
    NextMarker ?: string;
 };
 /**
 * Handle object listing with parameters. This extends the base class DelimiterMaster
 * to return the master/current versions.
 */
 class DelimiterCurrent extends DelimiterMaster {
    /**
     * Delimiter listing of current versions.
     * @param {Object}  parameters            - listing parameters
     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
     * @param {String}  parameters.excludedDataStoreName - excluded datatore name
     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
     * @param {RequestLogger} logger          - The logger of the request
     * @param {String} [vFormat]              - versioning key format
     */
    constructor(parameters, logger, vFormat) {
        super(parameters, logger, vFormat);
        this.beforeDate = parameters.beforeDate;
        this.excludedDataStoreName = parameters.excludedDataStoreName;
        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
        this.scannedKeys = 0;
    }
    genMDParamsV0() {
        const params = super.genMDParamsV0();
        // lastModified and dataStoreName parameters are used by metadata that enables built-in filtering, 
        // a feature currently exclusive to MongoDB
        if (this.beforeDate) {
            params.lastModified = {
                lt: this.beforeDate,
            };
        }
        if (this.excludedDataStoreName) {
            params.dataStoreName = {
                ne: this.excludedDataStoreName,
            }
        }
        return params;
    }
    /**
     * Parses the stringified entry's value.
     * @param s - sringified value
     * @return - undefined if parsing fails, otherwise it contains the parsed value.
     */
    _parse(s) {
        let p;
        try {
            p = JSON.parse(s);
        } catch (e: any) {
            this.logger.warn(
                'Could not parse Object Metadata while listing',
                { err: e.toString() });
        }
        return p;
    }
    /**
     * check if the max keys count has been reached and set the
     * final state of the result if it is the case
     *
     * specialized implementation on DelimiterCurrent to also check
     * the number of scanned keys
     *
     * @return {Boolean} - indicates if the iteration has to stop
     */
    _reachedMaxKeys(): boolean {
        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
            this.IsTruncated = true;
            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
                {
                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
                    scannedKeys: this.scannedKeys,
                });
            return true;
        }
        return super._reachedMaxKeys();
    }
    addContents(key, value) {
        ++this.scannedKeys;
        const parsedValue = this._parse(value);
        // if parsing fails, skip the key.
        if (parsedValue) {
            const lastModified = parsedValue['last-modified'];
            const dataStoreName = parsedValue.dataStoreName;
            // We then check if the current version is older than the "beforeDate" and
            // "excludedDataStoreName" is not specified or if specified and the data store name is different.
            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) &&
                (!this.excludedDataStoreName || dataStoreName !== this.excludedDataStoreName)) {
                super.addContents(key, value);
            }
            // In the event of a timeout occurring before any content is added,
            // NextMarker is updated even if the object is not eligible.
            // It minimizes the amount of data that the client needs to re-process if the request times out.
            this.nextMarker = key;
        }
    }
    result(): object {
        const result: ResultObject = {
            Contents: this.Contents,
            IsTruncated: this.IsTruncated,
        };
        if (this.IsTruncated) {
            result.NextMarker = this.nextMarker;
        }
        return result;
    }
 }
 module.exports = { DelimiterCurrent };
--- a/lib/algos/list/delimiterMaster.js
+++ b/lib/algos/list/delimiterMaster.js
@ -0,0 +1,196 @@
 'use strict'; // eslint-disable-line strict
 const Delimiter = require('./delimiter').Delimiter;
 const Version = require('../../versioning/Version').Version;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { BucketVersioningKeyFormat } = VSConst;
 const { FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
 const VID_SEP = VSConst.VersionId.Separator;
 const { DbPrefixes } = VSConst;
 /**
 * Handle object listing with parameters. This extends the base class Delimiter
 * to return the raw master versions of existing objects.
 */
 class DelimiterMaster extends Delimiter {
    /**
     * Delimiter listing of master versions.
     * @param {Object}  parameters            - listing parameters
     * @param {String}  parameters.delimiter  - delimiter per amazon format
     * @param {String}  parameters.prefix     - prefix per amazon format
     * @param {String}  parameters.marker     - marker per amazon format
     * @param {Number}  parameters.maxKeys    - number of keys to list
     * @param {Boolean} parameters.v2         - indicates whether v2 format
     * @param {String}  parameters.startAfter - marker per amazon v2 format
     * @param {String}  parameters.continuationToken - obfuscated amazon token
     * @param {RequestLogger} logger          - The logger of the request
     * @param {String} [vFormat]              - versioning key format
     */
    constructor(parameters, logger, vFormat) {
        super(parameters, logger, vFormat);
        // non-PHD master version or a version whose master is a PHD version
        this.prvKey = undefined;
        this.prvPHDKey = undefined;
        this.inReplayPrefix = false;
        Object.assign(this, {
            [BucketVersioningKeyFormat.v0]: {
                filter: this.filterV0,
                skipping: this.skippingV0,
            },
            [BucketVersioningKeyFormat.v1]: {
                filter: this.filterV1,
                skipping: this.skippingV1,
            },
        }[this.vFormat]);
    }
    /**
     *  Filter to apply on each iteration for buckets in v0 format,
     *  based on:
     *  - prefix
     *  - delimiter
     *  - maxKeys
     *  The marker is being handled directly by levelDB
     *  @param {Object} obj       - The key and value of the element
     *  @param {String} obj.key   - The key of the element
     *  @param {String} obj.value - The value of the element
     *  @return {number}          - indicates if iteration should continue
     */
    filterV0(obj) {
        let key = obj.key;
        const value = obj.value;
        if (key.startsWith(DbPrefixes.Replay)) {
            this.inReplayPrefix = true;
            return FILTER_SKIP;
        }
        this.inReplayPrefix = false;
        /* Skip keys not starting with the prefix or not alphabetically
         * ordered. */
        if ((this.prefix && !key.startsWith(this.prefix))
                || (typeof this[this.nextContinueMarker] === 'string' &&
                    key <= this[this.nextContinueMarker])) {
            return FILTER_SKIP;
        }
        /* Skip version keys (<key><versionIdSeparator><version>) if we already
         * have a master version. */
        const versionIdIndex = key.indexOf(VID_SEP);
        if (versionIdIndex >= 0) {
            key = key.slice(0, versionIdIndex);
            /* - key === this.prvKey is triggered when a master version has
             *   been accepted for this key,
             * - key === this.NextMarker or this.NextContinueToken is triggered
             *   when a listing page ends on an accepted obj and the next page
             *   starts with a version of this object.
             *   In that case prvKey is default set to undefined
             *   in the constructor and comparing to NextMarker is the only
             *   way to know  we should not accept this version. This test is
             *   not redundant with the one at the beginning of this function,
             *   we are comparing here the key without the version suffix,
             * - key startsWith the previous NextMarker happens because we set
             *   NextMarker to the common prefix instead of the whole key
             *   value. (TODO: remove this test once ZENKO-1048 is fixed)
             *   */
            if (key === this.prvKey || key === this[this.nextContinueMarker] ||
                (this.delimiter &&
                key.startsWith(this[this.nextContinueMarker]))) {
                /* master version already filtered */
                return FILTER_SKIP;
            }
        }
        if (Version.isPHD(value)) {
            /* master version is a PHD version, we want to wait for the next
             * one:
             * - Set the prvKey to undefined to not skip the next version,
             * - return accept to avoid users to skip the next values in range
             *   (skip scan mechanism in metadata backend like Metadata or
             *   MongoClient). */
            this.prvKey = undefined;
            this.prvPHDKey = key;
            return FILTER_ACCEPT;
        }
        if (Version.isDeleteMarker(value)) {
            /* This entry is a deleteMarker which has not been filtered by the
             * version test. Either :
             * - it is a deleteMarker on the master version, we want to SKIP
             *   all the following entries with this key (no master version),
             * - or a deleteMarker following a PHD (setting prvKey to undefined
             *   when an entry is a PHD avoids the skip on version for the
             *   next entry). In that case we expect the master version to
             *   follow. */
            if (key === this.prvPHDKey) {
                this.prvKey = undefined;
                return FILTER_ACCEPT;
            }
            this.prvKey = key;
            return FILTER_SKIP;
        }
        this.prvKey = key;
        if (this.delimiter) {
            // check if the key has the delimiter
            const baseIndex = this.prefix ? this.prefix.length : 0;
            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
            if (delimiterIndex >= 0) {
                // try to add the prefix to the list
                return this.addCommonPrefix(key, delimiterIndex);
            }
        }
        return this.addContents(key, value);
    }
    /**
     *  Filter to apply on each iteration for buckets in v1 format,
     *  based on:
     *  - prefix
     *  - delimiter
     *  - maxKeys
     *  The marker is being handled directly by levelDB
     *  @param {Object} obj       - The key and value of the element
     *  @param {String} obj.key   - The key of the element
     *  @param {String} obj.value - The value of the element
     *  @return {number}          - indicates if iteration should continue
     */
    filterV1(obj) {
        // Filtering master keys in v1 is simply listing the master
        // keys, as the state of version keys do not change the
        // result, so we can use Delimiter method directly.
        return super.filter(obj);
    }
    skippingBase() {
        if (this[this.nextContinueMarker]) {
            // next marker or next continuation token:
            // - foo/ : skipping foo/
            // - foo  : skipping foo.
            const index = this[this.nextContinueMarker].
                lastIndexOf(this.delimiter);
            if (index === this[this.nextContinueMarker].length - 1) {
                return this[this.nextContinueMarker];
            }
            return this[this.nextContinueMarker] + VID_SEP;
        }
        return SKIP_NONE;
    }
    skippingV0() {
        if (this.inReplayPrefix) {
            return DbPrefixes.Replay;
        }
        return this.skippingBase();
    }
    skippingV1() {
        const skipTo = this.skippingBase();
        if (skipTo === SKIP_NONE) {
            return SKIP_NONE;
        }
        return DbPrefixes.Master + skipTo;
    }
 }
 module.exports = { DelimiterMaster };
--- a/lib/algos/list/delimiterMaster.ts
+++ b/lib/algos/list/delimiterMaster.ts
@ -1,620 +0,0 @@
 import {
    Delimiter,
    FilterState,
    FilterReturnValue,
    DelimiterFilterStateId,
    DelimiterFilterState_NotSkipping,
    DelimiterFilterState_SkippingPrefix,
    ResultObject,
 } from './delimiter';
 const Version = require('../../versioning/Version').Version;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { BucketVersioningKeyFormat } = VSConst;
 const { FILTER_ACCEPT, FILTER_SKIP, FILTER_END, SKIP_NONE, inc } = require('./tools');
 import { GapSetEntry } from '../cache/GapSet';
 import { GapCacheInterface } from '../cache/GapCache';
 const VID_SEP = VSConst.VersionId.Separator;
 const { DbPrefixes } = VSConst;
 export const enum DelimiterMasterFilterStateId {
    SkippingVersionsV0 = 101,
    WaitVersionAfterPHDV0 = 102,
    SkippingGapV0 = 103,
 };
 interface DelimiterMasterFilterState_SkippingVersionsV0 extends FilterState {
    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
    masterKey: string,
 };
 interface DelimiterMasterFilterState_WaitVersionAfterPHDV0 extends FilterState {
    id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
    masterKey: string,
 };
 interface DelimiterMasterFilterState_SkippingGapV0 extends FilterState {
    id: DelimiterMasterFilterStateId.SkippingGapV0,
 };
 export const enum GapCachingState {
    NoGapCache = 0, // there is no gap cache
    UnknownGap = 1, // waiting for a cache lookup
    GapLookupInProgress = 2, // asynchronous gap lookup in progress
    GapCached = 3, // an upcoming or already skippable gap is cached
    NoMoreGap = 4, // the cache doesn't have any more gaps inside the listed range
 };
 type GapCachingInfo_NoGapCache = {
    state: GapCachingState.NoGapCache;
 };
 type GapCachingInfo_NoCachedGap = {
    state: GapCachingState.UnknownGap
        | GapCachingState.GapLookupInProgress
    gapCache: GapCacheInterface;
 };
 type GapCachingInfo_GapCached = {
    state: GapCachingState.GapCached;
    gapCache: GapCacheInterface;
    gapCached: GapSetEntry;
 };
 type GapCachingInfo_NoMoreGap = {
    state: GapCachingState.NoMoreGap;
 };
 type GapCachingInfo = GapCachingInfo_NoGapCache
    | GapCachingInfo_NoCachedGap
    | GapCachingInfo_GapCached
    | GapCachingInfo_NoMoreGap;
 export const enum GapBuildingState {
    Disabled = 0, // no gap cache or no gap building needed (e.g. in V1 versioning format)
    NotBuilding = 1, // not currently building a gap (i.e. not listing within a gap)
    Building = 2, // currently building a gap (i.e. listing within a gap)
    Expired = 3, // not allowed to build due to exposure delay timeout
 };
 type GapBuildingInfo_NothingToBuild = {
    state: GapBuildingState.Disabled | GapBuildingState.Expired;
 };
 type GapBuildingParams = {
    /**
     * minimum weight for a gap to be created in the cache
     */
    minGapWeight: number;
    /**
     * trigger a cache setGap() call every N skippable keys
     */
    triggerSaveGapWeight: number;
    /**
     * timestamp to assess whether we're still inside the validity period to
     * be allowed to build gaps
     */
    initTimestamp: number;
 };
 type GapBuildingInfo_NotBuilding = {
    state: GapBuildingState.NotBuilding;
    gapCache: GapCacheInterface;
    params: GapBuildingParams;
 };
 type GapBuildingInfo_Building = {
    state: GapBuildingState.Building;
    gapCache: GapCacheInterface;
    params: GapBuildingParams;
    /**
     * Gap currently being created
     */
    gap: GapSetEntry;
    /**
     * total current weight of the gap being created
     */
    gapWeight: number;
 };
 type GapBuildingInfo = GapBuildingInfo_NothingToBuild
    | GapBuildingInfo_NotBuilding
    | GapBuildingInfo_Building;
 /**
 * Handle object listing with parameters. This extends the base class Delimiter
 * to return the raw master versions of existing objects.
 */
 export class DelimiterMaster extends Delimiter {
    _gapCaching: GapCachingInfo;
    _gapBuilding: GapBuildingInfo;
    _refreshedBuildingParams: GapBuildingParams | null;
    /**
     * Delimiter listing of master versions.
     * @param {Object}  parameters            - listing parameters
     * @param {String}  [parameters.delimiter]  - delimiter per amazon format
     * @param {String}  [parameters.prefix]     - prefix per amazon format
     * @param {String}  [parameters.marker]     - marker per amazon format
     * @param {Number}  [parameters.maxKeys]    - number of keys to list
     * @param {Boolean} [parameters.v2]         - indicates whether v2 format
     * @param {String}  [parameters.startAfter] - marker per amazon v2 format
     * @param {String}  [parameters.continuationToken] - obfuscated amazon token
     * @param {RequestLogger} logger            - The logger of the request
     * @param {String}  [vFormat="v0"]          - versioning key format
     */
    constructor(parameters, logger, vFormat?: string) {
        super(parameters, logger, vFormat);
        if (this.vFormat === BucketVersioningKeyFormat.v0) {
            // override Delimiter's implementation of NotSkipping for
            // DelimiterMaster logic (skipping versions and special
            // handling of delete markers and PHDs)
            this.setKeyHandler(
                DelimiterFilterStateId.NotSkipping,
                this.keyHandler_NotSkippingPrefixNorVersionsV0.bind(this));
            // add extra state handlers specific to DelimiterMaster with v0 format
            this.setKeyHandler(
                DelimiterMasterFilterStateId.SkippingVersionsV0,
                this.keyHandler_SkippingVersionsV0.bind(this));
            this.setKeyHandler(
                DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
                this.keyHandler_WaitVersionAfterPHDV0.bind(this));
            this.setKeyHandler(
                DelimiterMasterFilterStateId.SkippingGapV0,
                this.keyHandler_SkippingGapV0.bind(this));
            if (this.marker) {
                // distinct initial state to include some special logic
                // before the first master key is found that does not have
                // to be checked afterwards
                this.state = <DelimiterMasterFilterState_SkippingVersionsV0> {
                    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
                    masterKey: this.marker,
                };
            } else {
                this.state = <DelimiterFilterState_NotSkipping> {
                    id: DelimiterFilterStateId.NotSkipping,
                };
            }
        } else {
            // save base implementation of the `NotSkipping` state in
            // Delimiter before overriding it with ours, to be able to call it from there
            this.keyHandler_NotSkipping_Delimiter = this.keyHandlers[DelimiterFilterStateId.NotSkipping];
            this.setKeyHandler(
                DelimiterFilterStateId.NotSkipping,
                this.keyHandler_NotSkippingPrefixNorVersionsV1.bind(this));
        }
        // in v1, we can directly use Delimiter's implementation,
        // which is already set to the proper state
        // default initialization of the gap cache and building states, can be
        // set by refreshGapCache()
        this._gapCaching = {
            state: GapCachingState.NoGapCache,
        };
        this._gapBuilding = {
            state: GapBuildingState.Disabled,
        };
        this._refreshedBuildingParams = null;
    }
    /**
     * Get the validity period left before a refresh of the gap cache is needed
     * to continue building new gaps.
     *
     * @return {number|null} one of:
     * - the remaining time in milliseconds in which gaps can be added to the
     *   cache before a call to refreshGapCache() is required
     * - or 0 if there is no time left and a call to refreshGapCache() is required
     *   to resume caching gaps
     * - or null if refreshing the cache is never needed (because the gap cache
     *   is either not available or not used)
     */
    getGapBuildingValidityPeriodMs(): number | null {
        let gapBuilding;
        switch (this._gapBuilding.state) {
        case GapBuildingState.Disabled:
            return null;
        case GapBuildingState.Expired:
            return 0;
        case GapBuildingState.NotBuilding:
            gapBuilding = <GapBuildingInfo_NotBuilding> this._gapBuilding;
            break;
        case GapBuildingState.Building:
            gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
            break;
        }
        const { gapCache, params } = gapBuilding;
        const elapsedTime = Date.now() - params.initTimestamp;
        return Math.max(gapCache.exposureDelayMs - elapsedTime, 0);
    }
    /**
     * Refresh the gaps caching logic (gaps are series of current delete markers
     * in V0 bucket metadata format). It has two effects:
     *
     * - starts exposing existing and future gaps from the cache to efficiently
     *   skip over series of current delete markers that have been seen and cached
     *   earlier
     *
     * - enables building and caching new gaps (or extend existing ones), for a
     *   limited time period defined by the `gapCacheProxy.exposureDelayMs` value
     *   in milliseconds. To refresh the validity period and resume building and
     *   caching new gaps, one must restart a new listing from the database (starting
     *   at the current listing key, included), then call refreshGapCache() again.
     *
     * @param {GapCacheInterface} gapCacheProxy - API proxy to the gaps cache
     *   (the proxy should handle prefixing object keys with the bucket name)
     * @param {number} [minGapWeight=100] - minimum weight of a gap for it to be
     *   added in the cache
     * @param {number} [triggerSaveGapWeight] - cumulative weight to wait for
     *   before saving the current building gap. Cannot be greater than
     *   `gapCacheProxy.maxGapWeight` (the value is thresholded to `maxGapWeight`
     *   otherwise). Defaults to `gapCacheProxy.maxGapWeight / 2`.
     * @return {undefined}
     */
    refreshGapCache(
        gapCacheProxy: GapCacheInterface,
        minGapWeight?: number,
        triggerSaveGapWeight?: number
    ): void {
        if (this.vFormat !== BucketVersioningKeyFormat.v0) {
            return;
        }
        if (this._gapCaching.state === GapCachingState.NoGapCache) {
            this._gapCaching = {
                state: GapCachingState.UnknownGap,
                gapCache: gapCacheProxy,
            };
        }
        const refreshedBuildingParams: GapBuildingParams = {
            minGapWeight: minGapWeight || 100,
            triggerSaveGapWeight: triggerSaveGapWeight
                || Math.trunc(gapCacheProxy.maxGapWeight / 2),
            initTimestamp: Date.now(),
        };
        if (this._gapBuilding.state === GapBuildingState.Building) {
            // refreshed params will be applied as soon as the current building gap is saved
            this._refreshedBuildingParams = refreshedBuildingParams;
        } else {
            this._gapBuilding = {
                state: GapBuildingState.NotBuilding,
                gapCache: gapCacheProxy,
                params: refreshedBuildingParams,
            };
        }
    }
    /**
     * Trigger a lookup of the closest upcoming or already skippable gap.
     *
     * @param {string} fromKey - lookup a gap not before 'fromKey'
     * @return {undefined} - the lookup is asynchronous and its
     * response is handled inside this function
     */
    _triggerGapLookup(gapCaching: GapCachingInfo_NoCachedGap, fromKey: string): void {
        this._gapCaching = {
            state: GapCachingState.GapLookupInProgress,
            gapCache: gapCaching.gapCache,
        };
        const maxKey = this.prefix ? inc(this.prefix) : undefined;
        gapCaching.gapCache.lookupGap(fromKey, maxKey).then(_gap => {
            const gap = <GapSetEntry | null> _gap;
            if (gap) {
                this._gapCaching = {
                    state: GapCachingState.GapCached,
                    gapCache: gapCaching.gapCache,
                    gapCached: gap,
                };
            } else {
                this._gapCaching = {
                    state: GapCachingState.NoMoreGap,
                };
            }
        });
    }
    _checkGapOnMasterDeleteMarker(key: string): FilterReturnValue {
        switch (this._gapBuilding.state) {
        case GapBuildingState.Disabled:
        case GapBuildingState.Expired:
            break;
        case GapBuildingState.NotBuilding:
            this._createBuildingGap(key, 1);
            break;
        case GapBuildingState.Building:
            this._updateBuildingGap(key);
            break;
        }
        if (this._gapCaching.state === GapCachingState.GapCached) {
            const { gapCached } = this._gapCaching;
            if (key >= gapCached.firstKey) {
                if (key <= gapCached.lastKey) {
                    // we are inside the last looked up cached gap: transition to
                    // 'SkippingGapV0' state
                    this.setState(<DelimiterMasterFilterState_SkippingGapV0> {
                        id: DelimiterMasterFilterStateId.SkippingGapV0,
                    });
                    // cut the current gap before skipping, it will be merged or
                    // chained with the existing one (depending on its weight)
                    if (this._gapBuilding.state === GapBuildingState.Building) {
                        // substract 1 from the weight because we are going to chain this gap,
                        // which has an overlap of one key.
                        this._gapBuilding.gap.weight -= 1;
                        this._cutBuildingGap();
                    }
                    return FILTER_SKIP;
                }
                // as we are past the cached gap, we will need another lookup
                this._gapCaching = {
                    state: GapCachingState.UnknownGap,
                    gapCache: this._gapCaching.gapCache,
                };
            }
        }
        if (this._gapCaching.state === GapCachingState.UnknownGap) {
            this._triggerGapLookup(this._gapCaching, key);
        }
        return FILTER_ACCEPT;
    }
    filter_onNewMasterKeyV0(key: string, value: string): FilterReturnValue {
        // if this master key is a delete marker, accept it without
        // adding the version to the contents
        if (Version.isDeleteMarker(value)) {
            // update the state to start skipping versions of the new master key
            this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
                id: DelimiterMasterFilterStateId.SkippingVersionsV0,
                masterKey: key,
            });
            return this._checkGapOnMasterDeleteMarker(key);
        }
        if (Version.isPHD(value)) {
            // master version is a PHD version: wait for the first
            // following version that will be considered as the actual
            // master key
            this.setState(<DelimiterMasterFilterState_WaitVersionAfterPHDV0> {
                id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
                masterKey: key,
            });
            return FILTER_ACCEPT;
        }
        // cut the current gap as soon as a non-deleted entry is seen
        this._cutBuildingGap();
        if (key.startsWith(DbPrefixes.Replay)) {
            // skip internal replay prefix entirely
            this.setState(<DelimiterFilterState_SkippingPrefix> {
                id: DelimiterFilterStateId.SkippingPrefix,
                prefix: DbPrefixes.Replay,
            });
            return FILTER_SKIP;
        }
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
        const commonPrefix = this.addCommonPrefixOrContents(key, value);
        if (commonPrefix) {
            // transition into SkippingPrefix state to skip all following keys
            // while they start with the same prefix
            this.setState(<DelimiterFilterState_SkippingPrefix> {
                id: DelimiterFilterStateId.SkippingPrefix,
                prefix: commonPrefix,
            });
            return FILTER_ACCEPT;
        }
        // update the state to start skipping versions of the new master key
        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
            masterKey: key,
        });
        return FILTER_ACCEPT;
    }
    keyHandler_NotSkippingPrefixNorVersionsV0(key: string, value: string): FilterReturnValue {
        return this.filter_onNewMasterKeyV0(key, value);
    }
    filter_onNewMasterKeyV1(key: string, value: string): FilterReturnValue {
        // if this master key is a delete marker, accept it without
        // adding the version to the contents
        if (Version.isDeleteMarker(value)) {
            return FILTER_ACCEPT;
        }
        // use base Delimiter's implementation
        return this.keyHandler_NotSkipping_Delimiter(key, value);
    }
    keyHandler_NotSkippingPrefixNorVersionsV1(key: string, value: string): FilterReturnValue {
        return this.filter_onNewMasterKeyV1(key, value);
    }
    keyHandler_SkippingVersionsV0(key: string, value: string): FilterReturnValue {
        /* In the SkippingVersionsV0 state, skip all version keys
         * (<key><versionIdSeparator><version>) */
        const versionIdIndex = key.indexOf(VID_SEP);
        if (versionIdIndex !== -1) {
            // version keys count in the building gap weight because they must
            // also be listed until skipped
            if (this._gapBuilding.state === GapBuildingState.Building) {
                this._updateBuildingGap(key);
            }
            return FILTER_SKIP;
        }
        return this.filter_onNewMasterKeyV0(key, value);
    }
    keyHandler_WaitVersionAfterPHDV0(key: string, value: string): FilterReturnValue {
        // After a PHD key is encountered, the next version key of the
        // same object if it exists is the new master key, hence
        // consider it as such and call 'onNewMasterKeyV0' (the test
        // 'masterKey == phdKey' is probably redundant when we already
        // know we have a versioned key, since all objects in v0 have
        // a master key, but keeping it in doubt)
        const { masterKey: phdKey } = <DelimiterMasterFilterState_WaitVersionAfterPHDV0> this.state;
        const versionIdIndex = key.indexOf(VID_SEP);
        if (versionIdIndex !== -1) {
            const masterKey = key.slice(0, versionIdIndex);
            if (masterKey === phdKey) {
                return this.filter_onNewMasterKeyV0(masterKey, value);
            }
        }
        return this.filter_onNewMasterKeyV0(key, value);
    }
    keyHandler_SkippingGapV0(key: string, value: string): FilterReturnValue {
        const { gapCache, gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
        if (key <= gapCached.lastKey) {
            return FILTER_SKIP;
        }
        this._gapCaching = {
            state: GapCachingState.UnknownGap,
            gapCache,
        };
        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
        });
        // Start a gap with weight=0 from the latest skippable key. This will
        // allow to extend the gap just skipped with a chained gap in case
        // other delete markers are seen after the existing gap is skipped.
        this._createBuildingGap(gapCached.lastKey, 0, gapCached.weight);
        return this.handleKey(key, value);
    }
    skippingBase(): string | undefined {
        switch (this.state.id) {
        case DelimiterMasterFilterStateId.SkippingVersionsV0:
            const { masterKey } = <DelimiterMasterFilterState_SkippingVersionsV0> this.state;
            return masterKey + inc(VID_SEP);
        case DelimiterMasterFilterStateId.SkippingGapV0:
            const { gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
            return gapCached.lastKey;
        default:
            return super.skippingBase();
        }
    }
    result(): ResultObject {
        this._cutBuildingGap();
        return super.result();
    }
    _checkRefreshedBuildingParams(params: GapBuildingParams): GapBuildingParams {
        if (this._refreshedBuildingParams) {
            const newParams = this._refreshedBuildingParams;
            this._refreshedBuildingParams = null;
            return newParams;
        }
        return params;
    }
    /**
     * Save the gap being built if allowed (i.e. still within the
     * allocated exposure time window).
     *
     * @return {boolean} - true if the gap was saved, false if we are
     * outside the allocated exposure time window.
     */
    _saveBuildingGap(): boolean {
        const { gapCache, params, gap, gapWeight } =
              <GapBuildingInfo_Building> this._gapBuilding;
        const totalElapsed = Date.now() - params.initTimestamp;
        if (totalElapsed >= gapCache.exposureDelayMs) {
            this._gapBuilding = {
                state: GapBuildingState.Expired,
            };
            this._refreshedBuildingParams = null;
            return false;
        }
        const { firstKey, lastKey, weight } = gap;
        gapCache.setGap(firstKey, lastKey, weight);
        this._gapBuilding = {
            state: GapBuildingState.Building,
            gapCache,
            params: this._checkRefreshedBuildingParams(params),
            gap: {
                firstKey: gap.lastKey,
                lastKey: gap.lastKey,
                weight: 0,
            },
            gapWeight,
        };
        return true;
    }
    /**
     * Create a new gap to be extended afterwards
     *
     * @param {string} newKey - gap's first key
     * @param {number} startWeight - initial weight of the building gap (usually 0 or 1)
     * @param {number} [cachedWeight] - if continuing a cached gap, weight of the existing
     *   cached portion
     * @return {undefined}
     */
    _createBuildingGap(newKey: string, startWeight: number, cachedWeight?: number): void {
        if (this._gapBuilding.state === GapBuildingState.NotBuilding) {
            const { gapCache, params } = <GapBuildingInfo_NotBuilding> this._gapBuilding;
            this._gapBuilding = {
                state: GapBuildingState.Building,
                gapCache,
                params: this._checkRefreshedBuildingParams(params),
                gap: {
                    firstKey: newKey,
                    lastKey: newKey,
                    weight: startWeight,
                },
                gapWeight: (cachedWeight || 0) + startWeight,
            };
        }
    }
    _updateBuildingGap(newKey: string): void {
        const gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
        const { params, gap } = gapBuilding;
        gap.lastKey = newKey;
        gap.weight += 1;
        gapBuilding.gapWeight += 1;
        // the GapCache API requires updating a gap regularly because it can only split
        // it once per update, by the known last key. In practice the default behavior
        // is to trigger an update after a number of keys that is half the maximum weight.
        // It is also useful for other listings to benefit from the cache sooner.
        if (gapBuilding.gapWeight >= params.minGapWeight &&
            gap.weight >= params.triggerSaveGapWeight) {
            this._saveBuildingGap();
        }
    }
    _cutBuildingGap(): void {
        if (this._gapBuilding.state === GapBuildingState.Building) {
            let gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
            let { gapCache, params, gap, gapWeight } = gapBuilding;
            // only set gaps that are significant enough in weight and
            // with a non-empty extension
            if (gapWeight >= params.minGapWeight && gap.weight > 0) {
                // we're done if we were not allowed to save the gap
                if (!this._saveBuildingGap()) {
                    return;
                }
                // params may have been refreshed, reload them
                gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
                params = gapBuilding.params;
            }
            this._gapBuilding = {
                state: GapBuildingState.NotBuilding,
                gapCache,
                params,
            };
        }
    }
 }
--- a/lib/algos/list/delimiterNonCurrent.js
+++ b/lib/algos/list/delimiterNonCurrent.js
@ -1,202 +0,0 @@
 const { DelimiterVersions } = require('./delimiterVersions');
 const { FILTER_END, FILTER_SKIP } = require('./tools');
 const TRIM_METADATA_MIN_BLOB_SIZE = 10000;
 /**
 * Handle object listing with parameters. This extends the base class DelimiterVersions
 * to return the raw non-current versions objects.
 */
 class DelimiterNonCurrent extends DelimiterVersions {
    /**
     * Delimiter listing of non-current versions.
     * @param {Object}  parameters                  - listing parameters
     * @param {String}  parameters.keyMarker        - key marker
     * @param {String}  parameters.versionIdMarker  - version id marker
     * @param {String}  parameters.beforeDate       - limit the response to keys with stale date older than beforeDate.
     * “stale date” is the date on when a version becomes non-current.
     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
     * @param {String} parameters.excludedDataStoreName - exclude dataStoreName matches from the versions
     * @param {RequestLogger} logger                - The logger of the request
     * @param {String} [vFormat]                    - versioning key format
     */
    constructor(parameters, logger, vFormat) {
        super(parameters, logger, vFormat);
        this.beforeDate = parameters.beforeDate;
        this.excludedDataStoreName = parameters.excludedDataStoreName;
        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
        // internal state
        this.prevKey = null;
        this.staleDate = null;
        this.scannedKeys = 0;
    }
    getLastModified(value) {
        let lastModified;
        try {
            const v = JSON.parse(value);
            lastModified = v['last-modified'];
        } catch (e) {
            this.logger.warn('could not parse Object Metadata while listing',
                {
                    method: 'getLastModified',
                    err: e.toString(),
                });
        }
        return lastModified;
    }
    // Overwrite keyHandler_SkippingVersions to include the last version from the previous listing.
    // The creation (last-modified) date of this version will be the stale date for the following version.
    // eslint-disable-next-line camelcase
    keyHandler_SkippingVersions(key, versionId, value) {
        if (key === this.keyMarker) {
            // since the nonversioned key equals the marker, there is
            // necessarily a versionId in this key
            const _versionId = versionId;
            if (_versionId < this.versionIdMarker) {
                // skip all versions until marker
                return FILTER_SKIP;
            }
        }
        this.setState({
            id: 1 /* NotSkipping */,
        });
        return this.handleKey(key, versionId, value);
    }
    filter(obj) {
        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
            this.IsTruncated = true;
            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
                {
                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
                    scannedKeys: this.scannedKeys,
                });
            return FILTER_END;
        }
        ++this.scannedKeys;
        return super.filter(obj);
    }
    /**
     * NOTE: Each version of a specific key is sorted from the latest to the oldest
     * thanks to the way version ids are generated.
     * DESCRIPTION: Skip the version if it represents the master key, but keep its last-modified date in memory,
     * which will be the stale date of the following version.
     * The following version is pushed only:
     * - if the "stale date" (picked up from the previous version) is available (JSON.parse has not failed),
     * - if "beforeDate" is not specified or if specified and the "stale date" is older.
     * - if "excludedDataStoreName" is not specified or if specified and the data store name is different
     * The in-memory "stale date" is then updated with the version's last-modified date to be used for
     * the following version.
     * The process stops and returns the available results if either:
     * - no more metadata key is left to be processed
     * - the listing reaches the maximum number of key to be returned
     * - the internal timeout is reached
     *  @param {String} key   - The key to add
     *  @param {String} versionId - The version id
     *  @param {String} value - The value of the key
     *  @return {undefined}
     */
    addVersion(key, versionId, value) {
        this.nextKeyMarker = key;
        this.nextVersionIdMarker = versionId;
        // Skip the version if it represents the non-current version, but keep its last-modified date,
        // which will be the stale date of the following version.
        const isCurrentVersion = key !== this.prevKey;
        if (isCurrentVersion) {
            this.staleDate = this.getLastModified(value);
            this.prevKey = key;
            return;
        }
        // The following version is pushed only:
        // - if the "stale date" (picked up from the previous version) is available (JSON.parse has not failed),
        // - if "beforeDate" is not specified or if specified and the "stale date" is older.
        // - if "excludedDataStoreName" is not specified or if specified and the data store name is different
        let lastModified;
        if (this.staleDate && (!this.beforeDate || this.staleDate < this.beforeDate)) {
            const parsedValue = this._parse(value);
            // if parsing fails, skip the key.
            if (parsedValue) {
                const dataStoreName = parsedValue.dataStoreName;
                lastModified = parsedValue['last-modified'];
                if (!this.excludedDataStoreName || dataStoreName !== this.excludedDataStoreName) {
                    const s = this._stringify(parsedValue, this.staleDate);
                    // check that _stringify succeeds to only push objects with a defined staleDate.
                    if (s) {
                        this.Versions.push({ key, value: s });
                        ++this.keys;
                    }
                }
            }
        }
        // The in-memory "stale date" is then updated with the version's last-modified date to be used for
        // the following version.
        this.staleDate = lastModified || this.getLastModified(value);
        return;
    }
    /**
     * Parses the stringified entry's value and remove the location property if too large.
     * @param {string} s - sringified value
     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
     */
    _parse(s) {
        let p;
        try {
            p = JSON.parse(s);
            if (s.length >= TRIM_METADATA_MIN_BLOB_SIZE) {
                delete p.location;
            }
        } catch (e) {
            this.logger.warn('Could not parse Object Metadata while listing', {
                method: 'DelimiterNonCurrent._parse',
                err: e.toString(),
            });
        }
        return p;
    }
    _stringify(parsedMD, staleDate) {
        const p = parsedMD;
        let s = undefined;
        p.staleDate = staleDate;
        try {
            s = JSON.stringify(p);
        } catch (e) {
            this.logger.warn('could not stringify Object Metadata while listing', {
                method: 'DelimiterNonCurrent._stringify',
                err: e.toString(),
            });
        }
        return s;
    }
    result() {
        const { Versions, IsTruncated, NextKeyMarker, NextVersionIdMarker } = super.result();
        const result = {
            Contents: Versions,
            IsTruncated,
        };
        if (NextKeyMarker) {
            result.NextKeyMarker = NextKeyMarker;
        }
        if (NextVersionIdMarker) {
            result.NextVersionIdMarker = NextVersionIdMarker;
        }
        return result;
    }
 }
 module.exports = { DelimiterNonCurrent };
--- a/lib/algos/list/delimiterOrphanDeleteMarker.js
+++ b/lib/algos/list/delimiterOrphanDeleteMarker.js
@ -1,204 +0,0 @@
 const DelimiterVersions = require('./delimiterVersions').DelimiterVersions;
 const { FILTER_END } = require('./tools');
 const TRIM_METADATA_MIN_BLOB_SIZE = 10000;
 /**
 * Handle object listing with parameters. This extends the base class DelimiterVersions
 * to return the orphan delete markers. Orphan delete markers are also
 * refered as expired object delete marker.
 * They are delete marker with zero noncurrent versions.
 */
 class DelimiterOrphanDeleteMarker extends DelimiterVersions {
    /**
     * Delimiter listing of orphan delete markers.
     * @param {Object}  parameters            - listing parameters
     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
     * @param {RequestLogger} logger          - The logger of the request
     * @param {String} [vFormat]              - versioning key format
     */
    constructor(parameters, logger, vFormat) {
        const {
            marker,
            maxKeys,
            prefix,
            beforeDate,
            maxScannedLifecycleListingEntries,
        } = parameters;
        const versionParams = {
            // The orphan delete marker logic uses the term 'marker' instead of 'keyMarker',
            // as the latter could suggest the presence of a 'versionIdMarker'.
            keyMarker: marker,
            maxKeys,
            prefix,
        };
        super(versionParams, logger, vFormat);
        this.maxScannedLifecycleListingEntries = maxScannedLifecycleListingEntries;
        this.beforeDate = beforeDate;
        // this.prevKeyName is used as a marker for the next listing when the current one reaches its entry limit.
        // We cannot rely on this.keyName, as it contains the name of the current key.
        // In the event of a listing interruption due to reaching the maximum scanned entries,
        // relying on this.keyName would cause the next listing to skip the current key because S3 starts
        // listing after the marker.
        this.prevKeyName = null;
        this.keyName = null;
        this.value = null;
        this.scannedKeys = 0;
    }
    _reachedMaxKeys() {
        if (this.keys >= this.maxKeys) {
            return true;
        }
        return false;
    }
    _addOrphan() {
        const parsedValue = this._parse(this.value);
        // if parsing fails, skip the key.
        if (parsedValue) {
            const lastModified = parsedValue['last-modified'];
            const isDeleteMarker = parsedValue.isDeleteMarker;
            // We then check if the orphan version is a delete marker and if it is older than the "beforeDate"
            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) && isDeleteMarker) {
                // Prefer returning an untrimmed data rather than stopping the service in case of parsing failure.
                const s = this._stringify(parsedValue) || this.value;
                this.Versions.push({ key: this.keyName, value: s });
                this.nextKeyMarker = this.keyName;
                ++this.keys;
            }
        }
    }
    /**
     * Parses the stringified entry's value and remove the location property if too large.
     * @param {string} s - sringified value
     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
     */
    _parse(s) {
        let p;
        try {
            p = JSON.parse(s);
            if (s.length >= TRIM_METADATA_MIN_BLOB_SIZE) {
                delete p.location;
            }
        } catch (e) {
            this.logger.warn('Could not parse Object Metadata while listing', {
                method: 'DelimiterOrphanDeleteMarker._parse',
                err: e.toString(),
            });
        }
        return p;
    }
    _stringify(value) {
        const p = value;
        let s = undefined;
        try {
            s = JSON.stringify(p);
        } catch (e) {
            this.logger.warn('could not stringify Object Metadata while listing',
                {
                    method: 'DelimiterOrphanDeleteMarker._stringify',
                    err: e.toString(),
                });
        }
        return s;
    }
    /**
     * The purpose of _isMaxScannedEntriesReached is to restrict the number of scanned entries,
     * thus controlling resource overhead (CPU...).
     * @return {boolean} isMaxScannedEntriesReached - true if the maximum limit on the number
     * of entries scanned has been reached, false otherwise.
    */
    _isMaxScannedEntriesReached() {
        return this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries;
    }
    filter(obj) {
        if (this._isMaxScannedEntriesReached()) {
            this.nextKeyMarker = this.prevKeyName;
            this.IsTruncated = true;
            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
                {
                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
                    scannedKeys: this.scannedKeys,
                });
            return FILTER_END;
        }
        ++this.scannedKeys;
        return super.filter(obj);
    }
    /**
     * NOTE: Each version of a specific key is sorted from the latest to the oldest
     * thanks to the way version ids are generated.
     * DESCRIPTION: For a given key, the latest version is kept in memory since it is the current version.
     * If the following version reference a new key, it means that the previous one was an orphan version.
     * We then check if the orphan version is a delete marker and if it is older than the "beforeDate"
     * The process stops and returns the available results if either:
     * - no more metadata key is left to be processed
     * - the listing reaches the maximum number of key to be returned
     * - the internal timeout is reached
     * NOTE: we cannot leverage MongoDB to list keys older than "beforeDate"
     * because then we will not be able to assess its orphanage.
     *  @param {String} key   - The object key.
     * @param {String} versionId   - The object version id.
     *  @param {String} value - The value of the key
     *  @return {undefined}
     */
    addVersion(key, versionId, value) {
        // For a given key, the youngest version is kept in memory since it represents the current version.
        if (key !== this.keyName) {
            // If this.value is defined, it means that <this.keyName, this.value> pair is "allowed" to be an orphan.
            if (this.value) {
                this._addOrphan();
            }
            this.prevKeyName = this.keyName;
            this.keyName = key;
            this.value = value;
            return;
        }
        // If the key is not the current version, we can skip it in the next listing
        // in the case where the current listing is interrupted due to reaching the maximum scanned entries.
        this.prevKeyName = key;
        this.keyName = key;
        this.value = null;
        return;
    }
    result() {
        // Only check for remaining last orphan delete marker if the listing is not interrupted.
        // This will help avoid false positives.
        if (!this._isMaxScannedEntriesReached()) {
            // The following check makes sure the last orphan delete marker is not forgotten.
            if (this.keys < this.maxKeys) {
                if (this.value) {
                    this._addOrphan();
                }
            // The following make sure that if makeKeys is reached, isTruncated is set to true.
            // We moved the "isTruncated" from _reachedMaxKeys to make sure we take into account the last entity
            // if listing is truncated right before the last entity and the last entity is a orphan delete marker.
            } else {
                this.IsTruncated = this.maxKeys > 0;
            }
        }
        const result = {
            Contents: this.Versions,
            IsTruncated: this.IsTruncated,
        };
        if (this.IsTruncated) {
            result.NextMarker = this.nextKeyMarker;
        }
        return result;
    }
 }
 module.exports = { DelimiterOrphanDeleteMarker };
--- a/lib/algos/list/delimiterVersions.js
+++ b/lib/algos/list/delimiterVersions.js
@ -0,0 +1,283 @@
 'use strict'; // eslint-disable-line strict
 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 } =
    require('./tools');
 const VID_SEP = VSConst.VersionId.Separator;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
 /**
 * 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 DelimiterVersions extends Delimiter {
    constructor(parameters, logger, vFormat) {
        super(parameters, logger, vFormat);
        // specific to version listing
        this.keyMarker = parameters.keyMarker;
        this.versionIdMarker = parameters.versionIdMarker;
        // internal state
        this.masterKey = undefined;
        this.masterVersionId = undefined;
        // listing results
        this.NextMarker = parameters.keyMarker;
        this.NextVersionIdMarker = undefined;
        this.inReplayPrefix = false;
        Object.assign(this, {
            [BucketVersioningKeyFormat.v0]: {
                genMDParams: this.genMDParamsV0,
                filter: this.filterV0,
                skipping: this.skippingV0,
            },
            [BucketVersioningKeyFormat.v1]: {
                genMDParams: this.genMDParamsV1,
                filter: this.filterV1,
                skipping: this.skippingV1,
            },
        }[this.vFormat]);
    }
    genMDParamsV0() {
        const params = {};
        if (this.parameters.prefix) {
            params.gte = this.parameters.prefix;
            params.lt = inc(this.parameters.prefix);
        }
        if (this.parameters.keyMarker) {
            if (params.gte && params.gte > this.parameters.keyMarker) {
                return params;
            }
            delete params.gte;
            if (this.parameters.versionIdMarker) {
                // versionIdMarker should always come with keyMarker
                // but may not be the other way around
                params.gt = this.parameters.keyMarker
                    + VID_SEP
                    + this.parameters.versionIdMarker;
            } else {
                params.gt = inc(this.parameters.keyMarker + VID_SEP);
            }
        }
        return params;
    }
    genMDParamsV1() {
        // return an array of two listing params sets to ask for
        // synchronized listing of M and V ranges
        const params = [{}, {}];
        if (this.parameters.prefix) {
            params[0].gte = DbPrefixes.Master + this.parameters.prefix;
            params[0].lt = DbPrefixes.Master + inc(this.parameters.prefix);
            params[1].gte = DbPrefixes.Version + this.parameters.prefix;
            params[1].lt = DbPrefixes.Version + inc(this.parameters.prefix);
        } else {
            params[0].gte = DbPrefixes.Master;
            params[0].lt = inc(DbPrefixes.Master); // stop after the last master key
            params[1].gte = DbPrefixes.Version;
            params[1].lt = inc(DbPrefixes.Version); // stop after the last version key
        }
        if (this.parameters.keyMarker) {
            if (params[1].gte <= DbPrefixes.Version + this.parameters.keyMarker) {
                delete params[0].gte;
                delete params[1].gte;
                params[0].gt = DbPrefixes.Master + inc(this.parameters.keyMarker + VID_SEP);
                if (this.parameters.versionIdMarker) {
                    // versionIdMarker should always come with keyMarker
                    // but may not be the other way around
                    params[1].gt = DbPrefixes.Version
                        + this.parameters.keyMarker
                        + VID_SEP
                        + this.parameters.versionIdMarker;
                } else {
                    params[1].gt = DbPrefixes.Version
                        + inc(this.parameters.keyMarker + VID_SEP);
                }
            }
        }
        return params;
    }
    /**
     * Used to synchronize listing of M and V prefixes by object key
     *
     * @param {object} masterObj object listed from first range
     * returned by genMDParamsV1() (the master keys range)
     * @param {object} versionObj object listed from second range
     * returned by genMDParamsV1() (the version keys range)
     * @return {number} comparison result:
     *   * -1 if master key < version key
     *   * 1 if master key > version key
     */
    compareObjects(masterObj, versionObj) {
        const masterKey = masterObj.key.slice(DbPrefixes.Master.length);
        const versionKey = versionObj.key.slice(DbPrefixes.Version.length);
        return masterKey < versionKey ? -1 : 1;
    }
    /**
     *  Add a (key, versionId, value) tuple to the listing.
     *  Set the NextMarker to the current key
     *  Increment the keys counter
     *  @param {object} obj             - the entry to add to the listing result
     *  @param {String} obj.key         - The key to add
     *  @param {String} obj.versionId   - versionId
     *  @param {String} obj.value       - The value of the key
     *  @return {Boolean} - indicates if iteration should continue
     */
    addContents(obj) {
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
        this.Contents.push({
            key: obj.key,
            value: this.trimMetadata(obj.value),
            versionId: obj.versionId,
        });
        this.NextMarker = obj.key;
        this.NextVersionIdMarker = obj.versionId;
        ++this.keys;
        return FILTER_ACCEPT;
    }
    /**
     *  Filter to apply on each iteration if bucket is in v0
     *  versioning key 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) {
        if (obj.key.startsWith(DbPrefixes.Replay)) {
            this.inReplayPrefix = true;
            return FILTER_SKIP;
        }
        this.inReplayPrefix = false;
        if (Version.isPHD(obj.value)) {
            // return accept to avoid skipping the next values in range
            return FILTER_ACCEPT;
        }
        return this.filterCommon(obj.key, obj.value);
    }
    /**
     *  Filter to apply on each iteration if bucket is in v1
     *  versioning key 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) {
        if (Version.isPHD(obj.value)) {
            // return accept to avoid skipping the next values in range
            return FILTER_ACCEPT;
        }
        // this function receives both M and V keys, but their prefix
        // length is the same so we can remove their prefix without
        // looking at the type of key
        return this.filterCommon(obj.key.slice(DbPrefixes.Master.length),
            obj.value);
    }
    filterCommon(key, value) {
        if (this.prefix && !key.startsWith(this.prefix)) {
            return FILTER_SKIP;
        }
        let nonversionedKey;
        let versionId = undefined;
        const versionIdIndex = key.indexOf(VID_SEP);
        if (versionIdIndex < 0) {
            nonversionedKey = key;
            this.masterKey = key;
            this.masterVersionId =
                Version.from(value).getVersionId() || 'null';
            versionId = this.masterVersionId;
        } else {
            nonversionedKey = key.slice(0, versionIdIndex);
            versionId = key.slice(versionIdIndex + 1);
            // skip a version key if it is the master version
            if (this.masterKey === nonversionedKey && this.masterVersionId === versionId) {
                return FILTER_SKIP;
            }
            this.masterKey = undefined;
            this.masterVersionId = undefined;
        }
        if (this.delimiter) {
            const baseIndex = this.prefix ? this.prefix.length : 0;
            const delimiterIndex = nonversionedKey.indexOf(this.delimiter, baseIndex);
            if (delimiterIndex >= 0) {
                return this.addCommonPrefix(nonversionedKey, delimiterIndex);
            }
        }
        return this.addContents({ key: nonversionedKey, value, versionId });
    }
    skippingV0() {
        if (this.inReplayPrefix) {
            return DbPrefixes.Replay;
        }
        if (this.NextMarker) {
            const index = this.NextMarker.lastIndexOf(this.delimiter);
            if (index === this.NextMarker.length - 1) {
                return this.NextMarker;
            }
        }
        return SKIP_NONE;
    }
    skippingV1() {
        const skipV0 = this.skippingV0();
        if (skipV0 === SKIP_NONE) {
            return SKIP_NONE;
        }
        // skip to the same object key in both M and V range listings
        return [DbPrefixes.Master + skipV0,
            DbPrefixes.Version + skipV0];
    }
    /**
     *  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
         */
        return {
            CommonPrefixes: this.CommonPrefixes,
            Versions: this.Contents,
            IsTruncated: this.IsTruncated,
            NextKeyMarker: this.IsTruncated ? this.NextMarker : undefined,
            NextVersionIdMarker: this.IsTruncated ?
                this.NextVersionIdMarker : undefined,
            Delimiter: this.delimiter,
        };
    }
 }
 module.exports = { DelimiterVersions };
--- a/lib/algos/list/delimiterVersions.ts
+++ b/lib/algos/list/delimiterVersions.ts
@ -1,535 +0,0 @@
 'use strict'; // eslint-disable-line strict
 const Extension = require('./Extension').default;
 import {
    FilterState,
    FilterReturnValue,
 } from './delimiter';
 const Version = require('../../versioning/Version').Version;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { inc, FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } =
    require('./tools');
 const VID_SEP = VSConst.VersionId.Separator;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
 export const enum DelimiterVersionsFilterStateId {
    NotSkipping = 1,
    SkippingPrefix = 2,
    SkippingVersions = 3,
 };
 export interface DelimiterVersionsFilterState_NotSkipping extends FilterState {
    id: DelimiterVersionsFilterStateId.NotSkipping,
 };
 export interface DelimiterVersionsFilterState_SkippingPrefix extends FilterState {
    id: DelimiterVersionsFilterStateId.SkippingPrefix,
    prefix: string;
 };
 export interface DelimiterVersionsFilterState_SkippingVersions extends FilterState {
    id: DelimiterVersionsFilterStateId.SkippingVersions,
    gt: string;
 };
 type KeyHandler = (key: string, versionId: string | undefined, value: string) => FilterReturnValue;
 type ResultObject = {
    CommonPrefixes: string[],
    Versions: {
        key: string;
        value: string;
        versionId: string;
    }[];
    IsTruncated: boolean;
    Delimiter ?: string;
    NextKeyMarker ?: string;
    NextVersionIdMarker ?: string;
 };
 type GenMDParamsItem = {
    gt ?: string,
    gte ?: string,
    lt ?: 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 DelimiterVersions extends Extension {
    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;
        // specific to version listing
        this.keyMarker = parameters.keyMarker;
        this.versionIdMarker = parameters.versionIdMarker;
        // internal state
        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;
        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 (this.vFormat === BucketVersioningKeyFormat.v0) {
            this.setKeyHandler(
                DelimiterVersionsFilterStateId.NotSkipping,
                this.keyHandler_NotSkippingV0.bind(this));
        } else {
            this.setKeyHandler(
                DelimiterVersionsFilterStateId.NotSkipping,
                this.keyHandler_NotSkippingV1.bind(this));
        }
        this.setKeyHandler(
            DelimiterVersionsFilterStateId.SkippingPrefix,
            this.keyHandler_SkippingPrefix.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}${this.versionIdMarker}`,
            };
        } else {
            this.state = <DelimiterVersionsFilterState_NotSkipping> {
                id: DelimiterVersionsFilterStateId.NotSkipping,
            };
        }
    }
    genMDParamsV0() {
        const params: GenMDParamsItem = {};
        if (this.prefix) {
            params.gte = this.prefix;
            params.lt = inc(this.prefix);
        }
        if (this.keyMarker && this.delimiter) {
            const commonPrefix = this.getCommonPrefix(this.keyMarker);
            if (commonPrefix) {
                const afterPrefix = inc(commonPrefix);
                if (!params.gte || afterPrefix > params.gte) {
                    params.gte = afterPrefix;
                }
            }
        }
        if (this.keyMarker && (!params.gte || this.keyMarker >= params.gte)) {
            delete params.gte;
            if (this.versionIdMarker) {
                // start from the beginning of versions so we can
                // check if there's a null key and fetch it
                // (afterwards, we can skip the rest of versions until
                // we reach versionIdMarker)
                params.gte = `${this.keyMarker}${VID_SEP}`;
            } else {
                params.gt = `${this.keyMarker}${inc(VID_SEP)}`;
            }
        }
        return params;
    }
    genMDParamsV1() {
        // return an array of two listing params sets to ask for
        // synchronized listing of M and V ranges
        const v0Params: GenMDParamsItem = this.genMDParamsV0();
        const mParams: GenMDParamsItem = {};
        const vParams: GenMDParamsItem = {};
        if (v0Params.gt) {
            mParams.gt = `${DbPrefixes.Master}${v0Params.gt}`;
            vParams.gt = `${DbPrefixes.Version}${v0Params.gt}`;
        } else if (v0Params.gte) {
            mParams.gte = `${DbPrefixes.Master}${v0Params.gte}`;
            vParams.gte = `${DbPrefixes.Version}${v0Params.gte}`;
        } else {
            mParams.gte = DbPrefixes.Master;
            vParams.gte = DbPrefixes.Version;
        }
        if (v0Params.lt) {
            mParams.lt = `${DbPrefixes.Master}${v0Params.lt}`;
            vParams.lt = `${DbPrefixes.Version}${v0Params.lt}`;
        } else {
            mParams.lt = inc(DbPrefixes.Master);
            vParams.lt = inc(DbPrefixes.Version);
        }
        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
     *
     * @param {object} masterObj object listed from first range
     * returned by genMDParamsV1() (the master keys range)
     * @param {object} versionObj object listed from second range
     * returned by genMDParamsV1() (the version keys range)
     * @return {number} comparison result:
     *   * -1 if master key < version key
     *   * 1 if master key > version key
     */
    compareObjects(masterObj, versionObj) {
        const masterKey = masterObj.key.slice(DbPrefixes.Master.length);
        const versionKey = versionObj.key.slice(DbPrefixes.Version.length);
        return masterKey < versionKey ? -1 : 1;
    }
    /**
     * Parse a listing key into its nonversioned key and version ID components
     *
     * @param {string} key - full listing key
     * @return {object} obj
     * @return {string} obj.key - nonversioned part of key
     * @return {string} [obj.versionId] - version ID in the key
     */
    parseKey(fullKey: string): { key: string, versionId ?: string } {
        const versionIdIndex = fullKey.indexOf(VID_SEP);
        if (versionIdIndex === -1) {
            return { key: fullKey };
        }
        const nonversionedKey: string = fullKey.slice(0, versionIdIndex);
        let versionId: string = fullKey.slice(versionIdIndex + 1);
        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
     *  Increment the keys counter
     *  @param {String} key         - The key to add
     *  @param {String} versionId   - versionId
     *  @param {String} value       - The value of the key
     *  @return {undefined}
     */
    addVersion(key: string, versionId: string, value: string) {
        this.Versions.push({
            key,
            versionId,
            value: this.trimMetadata(value),
        });
        this.nextKeyMarker = key;
        this.nextVersionIdMarker = versionId;
        ++this.keys;
    }
    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
     * @return {undefined}
     */
    addCommonPrefix(commonPrefix: string): void {
        // add the new prefix to the list
        this.CommonPrefixes.push(commonPrefix);
        ++this.keys;
        this.nextKeyMarker = commonPrefix;
        this.nextVersionIdMarker = undefined;
    }
    /**
     * Cache the current null key, to save it for outputting it later at
     * the correct position
     *
     * @param {String} key        - nonversioned key of the null key
     * @param {String} versionId  - real version ID of the null key
     * @param {String} value      - value of the null key
     * @return {undefined}
     */
    cacheNullKey(key: string, versionId: string, value: string): void {
        this.nullKey = { key, versionId, value };
    }
    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;
        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);
    }
    setState(state: FilterState): void {
        this.state = state;
    }
    setKeyHandler(stateId: number, keyHandler: KeyHandler): void {
        this.keyHandlers[stateId] = keyHandler;
    }
    handleKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
        return this.keyHandlers[this.state.id](key, versionId, value);
    }
    keyHandler_NotSkippingV0(key: string, versionId: string | undefined, value: string): FilterReturnValue {
        if (key.startsWith(DbPrefixes.Replay)) {
            // skip internal replay prefix entirely
            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
                id: DelimiterVersionsFilterStateId.SkippingPrefix,
                prefix: DbPrefixes.Replay,
            });
            return FILTER_SKIP;
        }
        if (Version.isPHD(value)) {
            return FILTER_ACCEPT;
        }
        return this.filter_onNewKey(key, versionId, 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);
    }
    filter_onNewKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
        if (this._reachedMaxKeys()) {
            return FILTER_END;
        }
        if (versionId === undefined) {
            this.masterKey = key;
            this.masterVersionId = Version.from(value).getVersionId() || 'null';
            this.addKey(this.masterKey, this.masterVersionId, value);
        } else {
            if (this.masterKey === key && this.masterVersionId === versionId) {
                // do not add a version key if it is the master version
                return FILTER_ACCEPT;
            }
            this.addKey(key, versionId, value);
        }
        return FILTER_ACCEPT;
    }
    keyHandler_SkippingPrefix(key: string, versionId: string | undefined, value: string): FilterReturnValue {
        const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
        if (key.startsWith(prefix)) {
            return FILTER_SKIP;
        }
        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
            id: DelimiterVersionsFilterStateId.NotSkipping,
        });
        return this.handleKey(key, versionId, value);
    }
    keyHandler_SkippingVersions(key: string, versionId: string | undefined, value: string): FilterReturnValue {
        if (key === this.keyMarker) {
            // since the nonversioned key equals the marker, there is
            // necessarily a versionId in this key
            const _versionId = <string> versionId;
            if (_versionId < this.versionIdMarker) {
                // skip all versions until marker
                return FILTER_SKIP;
            }
            if (_versionId === this.versionIdMarker) {
                // nothing left to skip, so return ACCEPT, but don't add this version
                return FILTER_ACCEPT;
            }
        }
        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
            id: DelimiterVersionsFilterStateId.NotSkipping,
        });
        return this.handleKey(key, versionId, value);
    }
    skippingBase(): string | undefined {
        switch (this.state.id) {
        case DelimiterVersionsFilterStateId.SkippingPrefix:
            const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
            return inc(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`;
        default:
            return SKIP_NONE;
        }
    }
    skippingV0() {
        return this.skippingBase();
    }
    skippingV1() {
        const skipTo = this.skippingBase();
        if (skipTo === SKIP_NONE) {
            return SKIP_NONE;
        }
        // skip to the same object key in both M and V range listings
        return [
            `${DbPrefixes.Master}${skipTo}`,
            `${DbPrefixes.Version}${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() {
        // Add the last null key if still in cache (when it is the
        // last version of the last key)
        //
        // NOTE: _reachedMaxKeys sets IsTruncated to true when it
        // returns true. Here we want this because either:
        //
        // - we did not reach the max keys yet so the result is not
        // - truncated, and there is still room for the null key in
        // - the results
        //
        // - OR we reached it already while having to process a new
        //   key (so the result is truncated even without the null key)
        //
        // - OR we are *just* below the limit but the null key to add
        //   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);
        }
        const result: ResultObject = {
            CommonPrefixes: this.CommonPrefixes,
            Versions: this.Versions,
            IsTruncated: this.IsTruncated,
        };
        if (this.delimiter) {
            result.Delimiter = this.delimiter;
        }
        if (this.IsTruncated) {
            result.NextKeyMarker = this.nextKeyMarker;
            if (this.nextVersionIdMarker) {
                result.NextVersionIdMarker = this.nextVersionIdMarker;
            }
        };
        return result;
    }
 }
 module.exports = { DelimiterVersions };
--- a/lib/algos/list/exportAlgos.js
+++ b/lib/algos/list/exportAlgos.js
@ -6,7 +6,4 @@ module.exports = {
    DelimiterMaster: require('./delimiterMaster')
        .DelimiterMaster,
    MPU: require('./MPU').MultipartUploads,
    DelimiterCurrent: require('./delimiterCurrent').DelimiterCurrent,
    DelimiterNonCurrent: require('./delimiterNonCurrent').DelimiterNonCurrent,
    DelimiterOrphanDeleteMarker: require('./delimiterOrphanDeleteMarker').DelimiterOrphanDeleteMarker,
 };
--- a/lib/algos/list/skip.js
+++ b/lib/algos/list/skip.js
@ -52,21 +52,21 @@ class Skip {
        assert(this.skipRangeCb);
        const filteringResult = this.extension.filter(entry);
-        const skipTo = this.extension.skipping();
+        const skippingRange = this.extension.skipping();
        if (filteringResult === FILTER_END) {
            this.listingEndCb();
        } else if (filteringResult === FILTER_SKIP
-                   && skipTo !== SKIP_NONE) {
+                   && skippingRange !== SKIP_NONE) {
            if (++this.streakLength >= MAX_STREAK_LENGTH) {
                let newRange;
-                if (Array.isArray(skipTo)) {
+                if (Array.isArray(skippingRange)) {
                    newRange = [];
-                    for (let i = 0; i < skipTo.length; ++i) {
+                    for (let i = 0; i < skippingRange.length; ++i) {
-                        newRange.push(skipTo[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, {
+    return callback(null, userInfo, authorizationResults, streamingV4Params);
        accountQuota: info.accountQuota || {},
    });
 }
 export type AuthV4RequestParams = {
@ -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 vaultUtilities from './in_memory/vaultUtilities';
-import * as inMemoryBackend from './backends/in_memory/Backend';
+import * as backend from './in_memory/Backend';
-import baseBackend from './backends/base';
+import validateAuthConfig from './in_memory/validateAuthConfig';
-import chainBackend from './backends/ChainBackend';
+import AuthLoader from './in_memory/AuthLoader';
 import validateAuthConfig from './backends/in_memory/validateAuthConfig';
 import AuthLoader from './backends/in_memory/AuthLoader';
 import Vault from './Vault';
 let vault: Vault | null = null;
@ -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,
+    proxyPath: string,
-    sessionToken?: string,
+    sessionToken: string
    payload?: 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);
@ -234,8 +215,7 @@ 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,
@ -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 inMemory = { backend, validateAuthConfig, AuthLoader }
 export const backends = { baseBackend, chainBackend }
 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 * as crypto from 'crypto';
-import { Logger } from 'werelogs';
+import errors from '../../errors';
 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(service: string, indexer: Indexer) {
-     * @constructor
+        this.service = service;
     * @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);
        this.indexer = indexer;
        this.formatResponse = formatter;
    }
    // CODEQUALITY-TODO-SYNC Should be synchronous
    verifySignatureV2(
        stringToSign: string,
        signatureFromRequest: string,
        accessKey: string,
-        options: any,
+        options: { algo: 'SHA256' | 'SHA1' },
-        callback: any,
+        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,
+        _options: { algo: 'SHA256' | 'SHA1' },
-        callback: any,
+        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 Backend {
-class S3AuthBackend extends InMemoryBackend {
+    constructor(authdata: Accounts) {
-    /**
+        super('s3', new Indexer(authdata));
     * @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);
    }
-    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/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++) {
+    const encoded: string[] = [];
-        let ch = input.charAt(i);
+
-        if ((ch >= 'A' && ch <= 'Z') ||
+    const charArray = Array.from(input);
-            (ch >= 'a' && ch <= 'z') ||
+    for (const ch of charArray) {
-            (ch >= '0' && ch <= '9') ||
+        switch (true) {
-            ch === '_' || ch === '-' ||
+            case ch >= 'A' && ch <= 'Z':
-            ch === '~' || ch === '.') {
+            case ch >= 'a' && ch <= 'z':
-            encoded = encoded.concat(ch);
+            case ch >= '0' && ch <= '9':
-        } else if (ch === ' ') {
+            case ch === '-':
-            encoded = encoded.concat('%20');
+            case ch === '_':
-        } else if (ch === '/') {
+            case ch === '~':
-            encoded = encoded.concat(slash);
+            case ch === '.':
-        } else if (ch === '*') {
+                encoded.push(ch);
-            encoded = encoded.concat(star);
+                break;
-        } else {
+            case ch === '/':
-            if (ch >= '\uD800' && ch <= '\uDBFF') {
+                encoded.push(slash);
-                // If this character is a high surrogate peek the next character
+                break;
-                // and join it with this one if the next character is a low
+            case ch === '*':
-                // surrogate.
+                encoded.push(star);
-                // Otherwise the encoded URI will contain the two surrogates as
+                break;
-                // two distinct UTF-8 sequences which is not valid UTF-8.
+            case ch === ' ':
-                if (i + 1 < input.length) {
+                encoded.push('%20');
-                    const ch2 = input.charAt(i + 1);
+                break;
-                    if (ch2 >= '\uDC00' && ch2 <= '\uDFFF') {
+            default:
-                        i++;
+                encoded.push(_toHexUTF8(ch));
-                        ch += ch2;
+                break;
        }
    }
-            }
+    return encoded.join('');
            encoded = encoded.concat(_toHexUTF8(ch));
        }
    }
    return encoded;
 }
--- a/lib/auth/v4/headerAuthCheck.ts
+++ b/lib/auth/v4/headerAuthCheck.ts
@ -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
@ -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/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
+const iamSecurityTokenSizeMin = 128;
-export const vaultGeneratedIamSecurityTokenSizeMin = 128;
+const iamSecurityTokenSizeMax = 128;
-// Safe to assume that a typical token size is less than 8192 bytes
+// Security token is an hex string (no real format from amazon)
-export const vaultGeneratedIamSecurityTokenSizeMax = 8192;
+const iamSecurityTokenPattern = new RegExp(
-// Base-64
+    `^[a-f0-9]{${iamSecurityTokenSizeMin},${iamSecurityTokenSizeMax}}$`,
-export const vaultGeneratedIamSecurityTokenPattern = /^[A-Za-z0-9/+=]*$/;
+);
 // info about the iam security token
 export const iamSecurityToken = {
-    min: vaultGeneratedIamSecurityTokenSizeMin,
+    min: iamSecurityTokenSizeMin,
-    max: vaultGeneratedIamSecurityTokenSizeMax,
+    max: iamSecurityTokenSizeMax,
-    pattern: vaultGeneratedIamSecurityTokenPattern,
+    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,
+export const mdModelVersion = 3;
 //     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;
 /*
 * 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 externalBackends = { aws_s3: true, azure: true, gcp: true, pfs: true }
-export const replicationBackends = { aws_s3: true, azure: true, gcp: true };
+export const hasCopyPartBackends = { aws_s3: true, gcp: true }
-// hex digest of sha256 hash of empty string:
+export const versioningNotImplBackends = { azure: true, gcp: true }
-export const emptyStringHash = crypto.createHash('sha256')
+export const mpuMDStoredExternallyBackend = { aws_s3: true, gcp: true }
    .update('', 'binary').digest('hex');
 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;
+// hex digest of sha256 hash of empty string:
-// GCP Object Tagging Prefix
+export const emptyStringHash = crypto.createHash('sha256').update('', 'binary').digest('hex');
 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';
 // Default expiration value of the S3 pre-signed URL duration
 // 604800 seconds (seven days).
 export const legacyLocations = ['sproxyd', 'legacy'];
 export const defaultPreSignedURLExpiry = 7 * 24 * 60 * 60;
 // Regex for ISO-8601 formatted date
 export const shortIso8601Regex = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z/;
@ -132,21 +96,16 @@ export const supportedNotificationEvents = new Set([
    's3:ObjectRemoved:*',
    's3:ObjectRemoved:Delete',
    's3:ObjectRemoved:DeleteMarkerCreated',
    's3:Replication:OperationFailedReplication',
    's3:ObjectTagging:*',
    's3:ObjectTagging:Put',
    's3:ObjectTagging:Delete',
    's3:ObjectAcl:Put',
    's3:ObjectRestore:*',
    's3:ObjectRestore:Post',
    's3:ObjectRestore:Completed',
    's3:ObjectRestore:Delete',
    's3:LifecycleTransition',
    's3:LifecycleExpiration:*',
    's3:LifecycleExpiration:DeleteMarkerCreated',
    's3:LifecycleExpiration:Delete',
 ]);
 export const notificationArnPrefix = 'arn:scality:bucketnotif';
 // some of the available data backends  (if called directly rather
 // than through the multiple backend gateway) need a key provided
 // as a string as first parameter of the get/delete methods.
 export const clientsRequireStringKey = { sproxyd: true, cdmi: true };
 // HTTP server keep-alive timeout is set to a higher value than
 // client's free sockets timeout to avoid the risk of triggering
 // ECONNRESET errors if the server closes the connection at the
@ -163,15 +122,7 @@ export const supportedLifecycleRules = [
    'expiration',
    'noncurrentVersionExpiration',
    'abortIncompleteMultipartUpload',
    'transitions',
    'noncurrentVersionTransition',
 ];
 // Maximum number of buckets to cache (bucket metadata)
 export const maxCachedBuckets = process.env.METADATA_MAX_CACHED_BUCKETS ?
    Number(process.env.METADATA_MAX_CACHED_BUCKETS) : 1000;
 export const validRestoreObjectTiers = new Set(['Expedited', 'Standard', 'Bulk']);
 export const maxBatchingConcurrentOperations = 5;
 /** For policy resource arn check we allow empty account ID to not break compatibility */
 export const policyArnAllowedEmptyAccountId = ['utapi', 'scuba'];
--- a/lib/db.ts
+++ b/lib/db.ts
@ -148,7 +148,7 @@ export class IndexTransaction {
                'missing condition for conditional put'
            );
        }
-        if (typeof condition.notExists !== 'string' && typeof condition.exists !== 'string') {
+        if (typeof condition.notExists !== 'string') {
            throw propError(
                'unsupportedConditionalOperation',
                'missing key or supported condition'
--- a/lib/errors/arsenalErrors.ts
+++ b/lib/errors/arsenalErrors.ts
@ -690,11 +690,6 @@ export const ReportNotPresent: ErrorFormat = {
        'The request was rejected because the credential report does not exist. To generate a credential report, use GenerateCredentialReport.',
 };
 export const Found: ErrorFormat = {
    code: 302,
    description: 'Resource Found'
 };
 // ------------- Special non-AWS S3 errors -------------
 export const MPUinProgress: ErrorFormat = {
@ -1042,15 +1037,3 @@ export const AuthMethodNotImplemented: ErrorFormat = {
    description: 'AuthMethodNotImplemented',
    code: 501,
 };
 // --------------------- quotaErros ---------------------
 export const NoSuchQuota: ErrorFormat = {
    code: 404,
    description: 'The specified resource does not have a quota.',
 };
 export const QuotaExceeded: ErrorFormat = {
    code: 429,
    description: 'The quota set for the resource is exceeded.',
 };
--- a/lib/errors/index.ts
+++ b/lib/errors/index.ts
@ -2,7 +2,7 @@ import type { ServerResponse } from 'http';
 import * as rawErrors from './arsenalErrors';
 /** All possible errors names. */
-export type Name = keyof typeof rawErrors;
+export type Name = keyof typeof rawErrors
 /** Object containing all errors names. It has the format { [Name]: "Name" } */
 export type Names = { [Name_ in Name]: Name_ };
 /** Mapping used to determine an error type. It has the format { [Name]: boolean } */
@ -13,7 +13,7 @@ export type Errors = { [_ in Name]: ArsenalError };
 // This object is reused constantly through createIs, we store it there
 // to avoid recomputation.
 const isBase = Object.fromEntries(
-    Object.keys(rawErrors).map((key) => [key, false])
+    Object.keys(rawErrors).map(key => [key, false])
 ) as Is;
 // This allows to conditionally add the old behavior of errors to properly
@ -32,7 +32,7 @@ export const allowUnsafeErrComp = (
 // the Proxy will return false.
 const createIs = (type: Name): Is => {
    const get = (is: Is, value: string | symbol) => is[value] ?? false;
-    const final = Object.freeze({ ...isBase, [type]: true });
+    const final = Object.freeze({ ...isBase, [type]: true })
    return new Proxy(final, { get });
 };
@ -46,18 +46,13 @@ export class ArsenalError extends Error {
    /** Object used to determine the error type.
     * Example: error.is.InternalError */
    #is: Is;
    /** A map of error metadata (can be extra fields
     * that only show in debug mode) */
    #metadata: Map<string, Object[]>;
-    private constructor(type: Name, code: number, description: string,
+    private constructor(type: Name, code: number, description: string) {
        metadata?: Map<string, Object[]>) {
        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);
+        return new ArsenalError(type, code, description);
        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;
    }
    /** 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",
+    "mocha": "2.5.3",
-    "async": "~2.6.1",
+    "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;
    }
-    /**
+    /** increment value of a key by 1 and set a ttl */
    * 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
     */
    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 and set a ttl */
     * 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
     */
    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);
    }
-    /**
+    /** execute a batch of commands */
     * 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
    */
    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 value - value within sorted set. Can specify
+     * @param {function} cb - callback
     *   multiple values within an array
     * @param 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)]);
+            reqsKeys.push(['get', this._buildKey(`${id}:requests`, d)]);
-            req500sKeys.push(['get', this.buildKey(`${id}:500s`, 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/metrics/ZenkoMetrics.ts
+++ b/lib/metrics/ZenkoMetrics.ts
@ -1,19 +1,26 @@
 import promClient from 'prom-client';
 const collectDefaultMetricsIntervalMs =
    process.env.COLLECT_DEFAULT_METRICS_INTERVAL_MS !== undefined ?
        Number.parseInt(process.env.COLLECT_DEFAULT_METRICS_INTERVAL_MS, 10) :
        10000;
 promClient.collectDefaultMetrics({ timeout: collectDefaultMetricsIntervalMs });
 export default class ZenkoMetrics {
-    static createCounter(params: promClient.CounterConfiguration<string>) {
+    static createCounter(params: promClient.CounterConfiguration) {
        return new promClient.Counter(params);
    }
-    static createGauge(params: promClient.GaugeConfiguration<string>) {
+    static createGauge(params: promClient.GaugeConfiguration) {
        return new promClient.Gauge(params);
    }
-    static createHistogram(params: promClient.HistogramConfiguration<string>) {
+    static createHistogram(params: promClient.HistogramConfiguration) {
        return new promClient.Histogram(params);
    }
-    static createSummary(params: promClient.SummaryConfiguration<string>) {
+    static createSummary(params: promClient.SummaryConfiguration) {
        return new promClient.Summary(params);
    }
@ -21,15 +28,11 @@ export default class ZenkoMetrics {
        return promClient.register.getSingleMetric(name);
    }
-    static async asPrometheus() {
+    static asPrometheus() {
        return promClient.register.metrics();
    }
    static asPrometheusContentType() {
        return promClient.register.contentType;
    }
    static collectDefaultMetrics() {
        return promClient.collectDefaultMetrics();
    }
 }
--- 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
+// BucketInfoModelVersion.md can be found in the root of this repository
-// of this repository
+const modelVersion = 10;
 const modelVersion = 16;
 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>;
+    _tags?: { key: string; value: string }[] | null;
    _readLocationConstraint: string | null;
    _isNFS: boolean | null;
    _azureInfo: any | null;
    _ingestion: { status: 'enabled' | 'disabled' } | null;
    _capabilities?: Capabilities;
    _quotaMax: number | 0;
    /**
    * Represents all bucket information.
    * @constructor
-    * @param name - bucket name
+    * @param {string} name - bucket name
-    * @param owner - bucket owner's name
+    * @param {string} owner - bucket owner's name
-    * @param ownerDisplayName - owner's display name
+    * @param {string} ownerDisplayName - owner's display name
-    * @param creationDate - creation date of bucket
+    * @param {object} creationDate - creation date of bucket
-    * @param mdBucketModelVersion - bucket model version
+    * @param {number} mdBucketModelVersion - bucket model version
-    * @param [acl] - bucket ACLs (no need to copy
+    * @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 {boolean} transient - flag indicating whether bucket is transient
-    * @param deleted - flag indicating whether attempt to delete
+    * @param {boolean} deleted - flag indicating whether attempt to delete
-    * @param serverSideEncryption - sse information for this bucket
+    * @param {object} serverSideEncryption - sse information for this bucket
-    * @param serverSideEncryption.cryptoScheme -
+    * @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 {object} versioningConfiguration - versioning configuration
-    * @param versioningConfiguration.Status - versioning status
+    * @param {string} versioningConfiguration.Status - versioning status
-    * @param versioningConfiguration.MfaDelete - versioning mfa delete
+    * @param {object} versioningConfiguration.MfaDelete - versioning mfa delete
-    * @param locationConstraint - locationConstraint for bucket that
+    * @param {string} locationConstraint - locationConstraint for bucket
-    * also includes the ingestion flag
+    * @param {WebsiteConfiguration} [websiteConfiguration] - website
    * @param [websiteConfiguration] - website
    * configuration
-    * @param [cors] - collection of CORS rules to apply
+    * @param {object[]} [cors] - collection of CORS rules to apply
-    * @param [cors[].id] - optional ID to identify rule
+    * @param {string} [cors[].id] - optional ID to identify rule
-    * @param cors[].allowedMethods - methods allowed for CORS request
+    * @param {string[]} cors[].allowedMethods - methods allowed for CORS request
-    * @param cors[].allowedOrigins - origins allowed for CORS request
+    * @param {string[]} cors[].allowedOrigins - origins allowed for CORS request
-    * @param [cors[].allowedHeaders] - headers allowed in an OPTIONS
+    * @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 {string[]} [cors[].exposeHeaders] - headers expose to applications
-    * @param [replicationConfiguration] - replication configuration
+    * @param {object} [replicationConfiguration] - replication configuration
-    * @param [lifecycleConfiguration] - lifecycle configuration
+    * @param {object} [lifecycleConfiguration] - lifecycle configuration
-    * @param [bucketPolicy] - bucket policy
+    * @param {object} [bucketPolicy] - bucket policy
-    * @param [uid] - unique identifier for the bucket, necessary
+    * @param {string} [uid] - unique identifier for the bucket, necessary
-    * @param readLocationConstraint - readLocationConstraint for bucket
+    * @param {boolean} [objectLockEnabled] - true when object lock enabled
-    * addition for use with lifecycle operations
+    * @param {object} [objectLockConfiguration] - object lock configuration
-    * @param [isNFS] - whether the bucket is on NFS
+    * @param {object} [notificationConfiguration] - bucket notification configuration
-    * @param [ingestionConfig] - object for ingestion status: en/dis
+    * @param {object[]} [tags] - bucket tags
    * @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
    */
    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> | [],
+        tags?: { key: string; value: string }[],
        capabilities?: Capabilities,
        quotaMax?: number | 0,
    ) {
        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) {
-        if (tags === undefined) {
+            assert(Array.isArray(tags));
            tags = [] as BucketTag[];
        }
        assert.strictEqual(areTagsValid(tags), true);
        if (quotaMax) {
            assert.strictEqual(typeof quotaMax, 'number');
            assert(quotaMax >= 0, 'Quota cannot be negative');
        }
        // 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._tags = tags || null;
        this._capabilities = capabilities || undefined;
        this._quotaMax = quotaMax || 0;
        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.bucketPolicy, obj.uid, obj.objectLockEnabled,
-            obj.ingestion, obj.azureInfo, obj.objectLockEnabled,
+            obj.objectLockConfiguration, obj.notificationConfiguration, obj.tags);
            obj.objectLockConfiguration, obj.notificationConfiguration, obj.tags,
            obj.capabilities, obj.quotaMax);
    }
    /**
@ -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._bucketPolicy, data._uid, data._objectLockEnabled,
-            data._isNFS, data._ingestion, data._azureInfo,
+            data._objectLockConfiguration, data._notificationConfiguration, data._tags);
            data._objectLockEnabled, data._objectLockConfiguration,
            data._notificationConfiguration, data._tags, data._capabilities,
            data._quotaMax);
    }
    /**
@ -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
@ -869,7 +508,6 @@ export default class LifecycleConfiguration {
     *              days: <value>,
     *              date: <value>,
     *              deleteMarker: <value>
     *              newerNoncurrentVersions: <value>,
     *          },
     *      ],
     * }
@ -882,20 +520,14 @@ export default class LifecycleConfiguration {
                actionName: string;
                days?: number;
                date?: number;
-                deleteMarker?: boolean;
+                deleteMarker?: boolean
                newerNoncurrentVersions?: number
            }[];
        } = {
            propName: 'actions',
            actions: [],
        };
-        const validActions = [
+        const validActions = ['AbortIncompleteMultipartUpload',
-            'AbortIncompleteMultipartUpload',
+            'Expiration', 'NoncurrentVersionExpiration'];
            'Expiration',
            'NoncurrentVersionExpiration',
            'NoncurrentVersionTransition',
            'Transition',
        ];
        validActions.forEach(a => {
            if (rule[a]) {
                actionsObj.actions.push({ actionName: `${a}` });
@ -912,14 +544,7 @@ export default class LifecycleConfiguration {
            if (action.error) {
                actionsObj.error = action.error;
            } else {
-                const actionTimes = [
+                const actionTimes = ['days', 'date', 'deleteMarker'];
                    'days',
                    'date',
                    'deleteMarker',
                    'transition',
                    'nonCurrentVersionTransition',
                    'newerNoncurrentVersions'
                ];
                actionTimes.forEach(t => {
                    if (action[t]) {
                        // eslint-disable-next-line no-param-reassign
@ -1013,9 +638,12 @@ export default class LifecycleConfiguration {
            return { error };
        }
        if (subExp.Date) {
-            const error = this._checkDate(subExp.Date[0]);
+            const isoRegex = new RegExp('^(-?(?:[1-9][0-9]*)?[0-9]{4})-' +
-            if (error) {
+                '(1[0-2]|0[1-9])-(3[01]|0[1-9]|[12][0-9])T(2[0-3]|[01][0-9])' +
-                expObj.error = error;
+                ':([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];
            }
@ -1065,7 +693,6 @@ export default class LifecycleConfiguration {
     * nvExpObj = {
     *      error: <error>,
     *      days: <value>,
     *      newerNoncurrentVersions: <value>,
     * }
     */
    _parseNoncurrentVersionExpiration(rule: any) {
@ -1076,41 +703,14 @@ export default class LifecycleConfiguration {
                'NoncurrentDays');
            return { error };
        }
        const actionParams: {
            error?: ArsenalError;
            days: number;
            newerNoncurrentVersions: number;
        } = {
            days: 0,
            newerNoncurrentVersions: 0,
        };
        const daysInt = parseInt(subNVExp.NoncurrentDays[0], 10);
        if (daysInt < 1) {
            const msg = 'NoncurrentDays is not a positive integer';
            const error = errors.InvalidArgument.customizeDescription(msg);
            return { error };
        } else {
-            actionParams.days = daysInt;
+            return { days: daysInt };
        }
        if (subNVExp.NewerNoncurrentVersions) {
            const newerVersionsInt = parseInt(subNVExp.NewerNoncurrentVersions[0], 10);
            if (Number.isNaN(newerVersionsInt) || newerVersionsInt < 1) {
                const msg = 'NewerNoncurrentVersions is not a positive integer';
                const error = errors.InvalidArgument.customizeDescription(msg);
                return { error };
            }
            actionParams.newerNoncurrentVersions = newerVersionsInt;
        } else {
            actionParams.newerNoncurrentVersions = 0;
        }
        return actionParams;
    }
    /**
@ -1153,30 +753,6 @@ 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');
                }
            });
        });
    }
@ -1226,24 +802,14 @@ export default class LifecycleConfiguration {
            }
            const Actions = actions.map(action => {
-                const {
+                const { actionName, days, date, deleteMarker } = action;
                    actionName,
                    days,
                    date,
                    deleteMarker,
                    nonCurrentVersionTransition,
                    transition,
                    newerNoncurrentVersions,
                } = action;
                let Action: any;
                if (actionName === 'AbortIncompleteMultipartUpload') {
                    Action = `<${actionName}><DaysAfterInitiation>${days}` +
                        `</DaysAfterInitiation></${actionName}>`;
                } else if (actionName === 'NoncurrentVersionExpiration') {
-                    const Days = `<NoncurrentDays>${days}</NoncurrentDays>`;
+                    Action = `<${actionName}><NoncurrentDays>${days}` +
-                    const NewerVersions = newerNoncurrentVersions ?
+                        `</NoncurrentDays></${actionName}>`;
                        `<NewerNoncurrentVersions>${newerNoncurrentVersions}</NewerNoncurrentVersions>` : '';
                    Action = `<${actionName}>${Days}${NewerVersions}</${actionName}>`;
                } else if (actionName === 'Expiration') {
                    const Days = days ? `<Days>${days}</Days>` : '';
                    const Date = date ? `<Date>${date}</Date>` : '';
@ -1253,40 +819,6 @@ export default class LifecycleConfiguration {
                    Action = `<${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>`;
@ -1320,18 +852,13 @@ export default class LifecycleConfiguration {
            }
            actions.forEach(action => {
-                const { actionName, days, date, deleteMarker, newerNoncurrentVersions } = action;
+                const { actionName, days, date, deleteMarker } = action;
                if (actionName === 'AbortIncompleteMultipartUpload') {
                    entry.addAbortMPU(days!);
                    return;
                }
                if (actionName === 'NoncurrentVersionExpiration') {
-                    entry.addNCVExpiration('NoncurrentDays', days!);
+                    entry.addNCVExpiration(days!);
                    if (newerNoncurrentVersions) {
                        entry.addNCVExpiration('NewerNoncurrentVersions', newerNoncurrentVersions!);
                    }
                    return;
                }
                if (actionName === 'Expiration') {
@ -1368,16 +895,6 @@ export type Rule = {
        days?: number;
        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
@ -10,10 +10,6 @@ export type Expiration = {
    Date?: number | boolean;
    Days?: number | boolean;
 };
 export type NoncurrentExpiration = {
    NoncurrentDays: number | null;
    NewerNoncurrentVersions: number | null;
 };
 /**
 * @class LifecycleRule
@ -25,10 +21,9 @@ export default class LifecycleRule {
    status: Status;
    tags: Tags;
    expiration?: Expiration;
-    ncvExpiration?: NoncurrentExpiration;
+    ncvExpiration?: { NoncurrentDays: number };
    abortMPU?: { DaysAfterInitiation: number };
    transitions?: any[];
    ncvTransitions?: any[];
    prefix?: string;
    constructor(id: string, status: Status) {
@ -43,10 +38,9 @@ export default class LifecycleRule {
            ID: string;
            Status: Status;
            Expiration?: Expiration;
-            NoncurrentVersionExpiration?: NoncurrentExpiration;
+            NoncurrentVersionExpiration?: { NoncurrentDays: number };
            AbortIncompleteMultipartUpload?: { DaysAfterInitiation: number };
            Transitions?: any[];
            NoncurrentVersionTransitions?: any[];
            Filter?: Filter;
            Prefix?: '';
        } = { ID: this.id, Status: this.status };
@ -55,7 +49,7 @@ export default class LifecycleRule {
            rule.Expiration = this.expiration;
        }
        if (this.ncvExpiration) {
-            rule.NoncurrentVersionExpiration = this.ncvExpiration
+            rule.NoncurrentVersionExpiration = this.ncvExpiration;
        }
        if (this.abortMPU) {
            rule.AbortIncompleteMultipartUpload = this.abortMPU;
@ -63,9 +57,6 @@ export default class LifecycleRule {
        if (this.transitions) {
            rule.Transitions = this.transitions;
        }
        if (this.ncvTransitions) {
            rule.NoncurrentVersionTransitions = this.ncvTransitions;
        }
        const filter = this.buildFilter();
@ -145,24 +136,15 @@ export default class LifecycleRule {
    /**
     * NoncurrentVersionExpiration
-     * @param prop - Property must be defined in `validProps`
+     * @param days - NoncurrentDays
     * @param value - integer for `NoncurrentDays` and `NewerNoncurrentVersions` 
     */
-    addNCVExpiration(prop: 'NoncurrentDays' | 'NewerNoncurrentVersions', value: number): this;
+    addNCVExpiration(days: number) {
-    addNCVExpiration(prop: string, value: number) {
+        this.ncvExpiration = { NoncurrentDays: days };
        const validProps = ['NoncurrentDays', 'NewerNoncurrentVersions'];
        if (validProps.includes(prop)) {
            this.ncvExpiration = this.ncvExpiration || {
                NoncurrentDays: null,
                NewerNoncurrentVersions: null,
            };
            this.ncvExpiration[prop] = value;
        }
        return this;
    }
    /**
-     * abortincompletemultipartupload
+     * AbortIncompleteMultipartUpload
     * @param days - DaysAfterInitiation
     */
    addAbortMPU(days: number) {
@ -178,13 +160,4 @@ export default class LifecycleRule {
        this.transitions = transitions;
        return this;
    }
    /**
     * NonCurrentVersionTransitions
     * @param nvcTransitions - NonCurrentVersionTransitions 
     */
    addNCVTransitions(nvcTransitions) {
        this.ncvTransitions = nvcTransitions;
        return this;
    }
 }
--- a/lib/models/ObjectMD.ts
+++ b/lib/models/ObjectMD.ts
@ -1,13 +1,9 @@
 import * as crypto from 'crypto';
 import * as constants from '../constants';
 import * as VersionIDUtils from '../versioning/VersionID';
 import { VersioningConstants } from '../versioning/constants';
 import ObjectMDLocation, {
    ObjectMDLocationData,
    Location,
 } from './ObjectMDLocation';
 import ObjectMDAmzRestore from './ObjectMDAmzRestore';
 import ObjectMDArchive from './ObjectMDArchive';
 export type ACL = {
    Canned: string;
@ -32,7 +28,6 @@ export type ReplicationInfo = {
    role: string;
    storageType: string;
    dataStoreVersionId: string;
    isNFS: boolean | null;
 };
 export type ObjectMDData = {
@ -40,33 +35,30 @@ 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;
+    // TODO: Handle this as a utility function for all object puts
-    archive?: ObjectMDArchive;
+    // 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[];
-    // versionId, isNull, isNull2, nullVersionId and isDeleteMarker
+    // versionId, isNull, nullVersionId and isDeleteMarker
    // should be undefined when not set explicitly
    isNull?: boolean;
    isNull2?: boolean;
    nullVersionId?: string;
    nullUploadId?: string;
    isDeleteMarker?: boolean;
@ -79,17 +71,6 @@ 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 +99,9 @@ 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._data['last-modified'] = new Date().toJSON();
            this.setLastModified(dt);
            this.setCreationTime(dt);
        }
        // set latest md model version now that we ensured
        // backward-compat conversion
@ -183,8 +156,6 @@ 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 +168,6 @@ 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: [],
@ -207,11 +177,9 @@ export default class ObjectMD {
            },
            key: '',
            location: null,
            azureInfo: undefined,
            // versionId, isNull, nullVersionId and isDeleteMarker
            // should be undefined when not set explicitly
            isNull: undefined,
            isNull2: undefined,
            nullVersionId: undefined,
            nullUploadId: undefined,
            isDeleteMarker: undefined,
@ -227,12 +195,9 @@ export default class ObjectMD {
                role: '',
                storageType: '',
                dataStoreVersionId: '',
                isNFS: null,
            },
            dataStoreName: '',
            originOp: '',
            deleted: false,
            isPHD: false,
        };
    }
@ -462,50 +427,6 @@ 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 +567,6 @@ 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 +672,6 @@ 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
     *
@ -836,31 +692,6 @@ export default class ObjectMD {
        return this._data.isNull || false;
    }
    /**
     * Set metadata isNull2 value
     *
     * @param isNull2 - Whether new version is null or not AND has
     * been put with a Cloudserver handling null keys (i.e. supporting
     * S3C-7352)
     * @return itself
     */
    setIsNull2(isNull2: boolean) {
        this._data.isNull2 = isNull2;
        return this;
    }
    /**
     * Get metadata isNull2 value
     *
     * @return isNull2 - Whether new version is null or not AND has
     * been put with a Cloudserver handling null keys (i.e. supporting
     * S3C-7352)
     */
    getIsNull2() {
        return this._data.isNull2 || false;
    }
    /**
     * Set metadata nullVersionId value
     *
@ -922,19 +753,6 @@ export default class ObjectMD {
        return this._data.isDeleteMarker || false;
    }
    /**
     * Get if the object is a multipart upload (MPU)
     *
     * The function checks the "content-md5" field: if it contains a
     * dash ('-') it is a MPU, as the content-md5 string ends with
     * "-[nbparts]" for MPUs.
     *
     * @return Whether object is a multipart upload
     */
    isMultipartUpload() {
        return this.getContentMd5().includes('-');
    }
    /**
     * Set metadata versionId value
     *
@ -952,9 +770,6 @@ export default class ObjectMD {
     * @return The object versionId
     */
    getVersionId() {
        if (this.getIsNull()) {
            return VersioningConstants.ExternalNullVersionId;
        }
        return this._data.versionId;
    }
@ -962,16 +777,13 @@ export default class ObjectMD {
     * Get metadata versionId value in encoded form (the one visible
     * to the S3 API user)
     *
-     * @return {undefined|string} The encoded object versionId
+     * @return The encoded object versionId
     */
    getEncodedVersionId() {
        const versionId = this.getVersionId();
-        if (versionId === VersioningConstants.ExternalNullVersionId) {
+        if (versionId) {
            return versionId;
        } else if (versionId) {
            return VersionIDUtils.encode(versionId);
        }
        return undefined;
    }
    /**
@ -1014,20 +826,6 @@ 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 +841,6 @@ export default class ObjectMD {
        role: string;
        storageType?: string;
        dataStoreVersionId?: string;
        isNFS?: boolean;
    }) {
        const {
            status,
@ -1054,7 +851,6 @@ export default class ObjectMD {
            role,
            storageType,
            dataStoreVersionId,
            isNFS,
        } = replicationInfo;
        this._data.replicationInfo = {
            status,
@ -1065,7 +861,6 @@ export default class ObjectMD {
            role,
            storageType: storageType || '',
            dataStoreVersionId: dataStoreVersionId || '',
            isNFS: isNFS || null,
        };
        return this;
    }
@ -1084,24 +879,6 @@ 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 +929,6 @@ 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 +1010,6 @@ 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 +1019,6 @@ 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 +1030,6 @@ 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 +1110,4 @@ 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', 'cryptoScheme', 'cipheredDataKey'].forEach(
-            'key',
+            (attrName) => {
            'dataStoreName',
            'dataStoreVersionId',
            '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;
+    _hasScalityDestination: boolean;
    _preferredReadLocation: string | null;
    /**
     * 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._hasScalityDestination = false;
        this._preferredReadLocation = null;
    }
    /**
@ -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 =>
+        const isValidStorageClass = storageClasses.every((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 => {
            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 NotificationConfiguration } from './NotificationConfiguration';
 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';
--- 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';
@ -367,13 +366,12 @@ export default class Server {
     * @param sock - Socket
     */
    _onClientError(err: Error, sock: net.Socket | tls.TLSSocket) {
        console.log(err)
        this._logger.error('client error', {
            method: 'arsenal.network.Server._onClientError',
            error: err.stack || err,
            address: sock.address(),
        });
        // socket is not systematically destroyed
        sock.destroy();
    }
    /**
@ -410,11 +408,7 @@ export default class Server {
                    method: 'arsenal.network.Server.start',
                    port: this._port,
                });
-                this._https.agent = new HttpsAgent.Agent(this._https, {
+                this._https.agent = new https.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._server = https.createServer(this._https,
                    (req, res) => this._onRequest(req, res));
            } else {
@ -435,6 +429,7 @@ 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_READY_ROUTE = '/_/live';
-export const DEFAULT_METRICS_ROUTE = '/metrics';
+export const DEFAULT_METRICS_ROUTE = '/_/metrics';
 /**
- * ProbeDelegate is used to handle probe checks.
+ * ProbeDelegate is used to determine if a probe is successful or
- * You can sendSuccess and sendError from Utils to handle success
+ * if any errors are present.
- * and failure conditions.
+ * If everything is working as intended, it is a no-op.
 * Otherwise, return a string representing what is failing.
 * @callback ProbeDelegate
 * @param res - HTTP response for writing
 * @param log - Werelogs instance for logging if you choose to
 * @return String representing issues to report. An empty
 * string or undefined is used to represent no issues.
 */
-export type ProbeDelegate = (res: http.ServerResponse, log: werelogs.RequestLogger) => string | void
+export type ProbeDelegate = (res: http.ServerResponse, log: RequestLogger) => string | void
 export type ProbeServerParams = {
    port: number;
@ -87,6 +90,12 @@ export class ProbeServer extends httpServer {
            return;
        }
-        this._handlers.get(req.url ?? '')?.(res, log);
+        const probeResponse = this._handlers.get(req.url!)!(res, log);
        if (probeResponse !== undefined && probeResponse !== '') {
            // Return an internal error with the response
            errors.InternalError
                .customizeDescription(probeResponse)
                .writeResponse(res);
        }
    }
 }
--- a/lib/network/probe/Utils.ts
+++ b/lib/network/probe/Utils.ts
@ -1,49 +0,0 @@
 import * as http from 'http';
 import { RequestLogger } from 'werelogs';
 import { ArsenalError } from '../../errors';
 /**
 * Send a successful HTTP response of 200 OK
 * @param res - HTTP response for writing
 * @param log - Werelogs instance for logging if you choose to
 * @param [message] - Message to send as response, defaults to OK
 */
 export function sendSuccess(
    res: http.ServerResponse,
    log: RequestLogger,
    message = 'OK'
 ) {
    log.debug('replying with success');
    res.writeHead(200);
    res.end(message);
 }
 /**
 * Send an Arsenal Error response
 * @param res - HTTP response for writing
 * @param log - Werelogs instance for logging if you choose to
 * @param error - Error to send back to the user
 * @param [optMessage] - Message to use instead of the errors message
 */
 export function sendError(
    res: http.ServerResponse,
    log: RequestLogger,
    error: ArsenalError,
    optMessage?: string
 ) {
    const message = optMessage || error.description || '';
    log.debug('sending back error response', {
        httpCode: error.code,
        errorType: error.message,
        error: message,
    });
    res.writeHead(error.code);
    res.end(
        JSON.stringify({
            errorType: error.message,
            errorMessage: message,
        })
    );
 }
--- a/lib/network/rest/RESTClient.ts
+++ b/lib/network/rest/RESTClient.ts
@ -4,7 +4,7 @@ import * as werelogs from 'werelogs';
 import * as constants from '../../constants';
 import * as utils from './utils';
 import errors, { ArsenalError } from '../../errors';
-import { http as HttpAgent } from 'httpagent';
+import HttpAgent from 'agentkeepalive';
 import * as stream from 'stream';
 function setRequestUids(reqHeaders: http.IncomingHttpHeaders, reqUids: string) {
@ -71,9 +71,8 @@ function makeErrorFromHTTPResponse(response: http.IncomingMessage) {
 export default class RESTClient {
    host: string;
    port: number;
-    httpAgent: http.Agent;
+    httpAgent: HttpAgent;
    logging: werelogs.Logger;
    isPassthrough: boolean;
    /**
     * Interface to the data file server
@ -89,19 +88,17 @@ export default class RESTClient {
        host: string;
        port: number;
        logApi: { Logger: typeof werelogs.Logger };
        isPassthrough?: boolean;
    }) {
        assert(params.host);
        assert(params.port);
        this.host = params.host;
        this.port = params.port;
        this.isPassthrough = params.isPassthrough || false;
        this.logging = new (params.logApi || werelogs).Logger('DataFileRESTClient');
-        this.httpAgent = new HttpAgent.Agent({
+        this.httpAgent = new HttpAgent({
            keepAlive: true,
            freeSocketTimeout: constants.httpClientFreeSocketTimeout,
-        }) as http.Agent;
+        });
    }
    /** Destroy the HTTP agent, forcing a close of the remaining open connections */
@ -119,18 +116,16 @@ export default class RESTClient {
        method: string,
        headers: http.OutgoingHttpHeaders | null,
        key: string | null,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
        responseCb: (res: http.IncomingMessage) => void,
    ) {
        const reqHeaders = headers || {};
        const urlKey = key || '';
        const prefix = this.isPassthrough ?
            constants.passthroughFileURL : constants.dataFileURL;
        const reqParams = {
            hostname: this.host,
            port: this.port,
            method,
-            path: encodeURI(`${prefix}/${urlKey}`),
+            path: `${constants.dataFileURL}/${urlKey}`,
            headers: reqHeaders,
            agent: this.httpAgent,
        };
--- a/lib/network/rest/RESTServer.ts
+++ b/lib/network/rest/RESTServer.ts
@ -4,7 +4,7 @@ import * as werelogs from 'werelogs';
 import * as http from 'http';
 import httpServer from '../http/server';
 import * as constants from '../../constants';
-import { parseURL } from './utils';
+import * as utils from './utils';
 import * as httpUtils from '../http/utils';
 import errors, { ArsenalError } from '../../errors';
@ -25,7 +25,7 @@ function setContentRange(
 function sendError(
    res: http.ServerResponse,
-    log: werelogs.RequestLogger,
+    log: RequestLogger,
    error: ArsenalError,
    optMessage?: string,
 ) {
@ -38,6 +38,42 @@ function sendError(
        errorMessage: message })}\n`);
 }
 /**
 * Parse the given url and return a pathInfo object. Sanity checks are
 * performed.
 *
 * @param urlStr - URL to parse
 * @param expectKey - whether the command expects to see a
 *   key in the URL
 * @return a pathInfo object with URL items containing the
 * following attributes:
 *   - pathInfo.service {String} - The name of REST service ("DataFile")
 *   - pathInfo.key {String} - The requested key
 */
 function parseURL(urlStr: string, expectKey: boolean) {
    const urlObj = url.parse(urlStr);
    const pathInfo = utils.explodePath(urlObj.path!);
    if (pathInfo.service !== constants.dataFileURL) {
        throw errors.InvalidAction.customizeDescription(
            `unsupported service '${pathInfo.service}'`);
    }
    if (expectKey && pathInfo.key === undefined) {
        throw errors.MissingParameter.customizeDescription(
            'URL is missing key');
    }
    if (!expectKey && pathInfo.key !== undefined) {
        // note: we may implement rewrite functionality by allowing a
        // key in the URL, though we may still provide the new key in
        // the Location header to keep immutability property and
        // atomicity of the update (we would just remove the old
        // object when the new one has been written entirely in this
        // case, saving a request over an equivalent PUT + DELETE).
        throw errors.InvalidURI.customizeDescription(
            'PUT url cannot contain a key');
    }
    return pathInfo;
 }
 /**
 * @class
 * @classdesc REST Server interface
@ -68,6 +104,7 @@ export default class RESTServer extends httpServer {
    }) {
        assert(params.port);
        // @ts-expect-error
        werelogs.configure({
            level: params.log.logLevel,
            dump: params.log.dumpLevel,
@ -141,7 +178,7 @@ export default class RESTServer extends httpServer {
    _onPut(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let size: number;
        try {
@ -183,7 +220,7 @@ export default class RESTServer extends httpServer {
    _onGet(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let pathInfo: ReturnType<typeof parseURL>;
        let rangeSpec: ReturnType<typeof httpUtils.parseRangeSpec> | undefined =
@ -266,7 +303,7 @@ export default class RESTServer extends httpServer {
    _onDelete(
        req: http.IncomingMessage,
        res: http.ServerResponse,
-        log: werelogs.RequestLogger,
+        log: RequestLogger,
    ) {
        let pathInfo: ReturnType<typeof parseURL>;
        try {
--- a/lib/network/rest/utils.ts
+++ b/lib/network/rest/utils.ts
@ -1,16 +1,6 @@
 import errors from '../../errors';
 import * as constants from '../../constants';
 import * as url from 'url';
 const passthroughPrefixLength = constants.passthroughFileURL.length;
 export function explodePath(path: string) {
    if (path.startsWith(constants.passthroughFileURL)) {
        const key = path.slice(passthroughPrefixLength + 1);
        return {
            service: constants.passthroughFileURL,
            key: key.length > 0 ? key : undefined,
        };
    }
    const pathMatch = /^(\/[a-zA-Z0-9]+)(\/([0-9a-f]*))?$/.exec(path);
    if (pathMatch) {
        return {
@ -20,41 +10,4 @@ export function explodePath(path: string) {
        };
    }
    throw errors.InvalidURI.customizeDescription('malformed URI');
-}
+};
 /**
 * Parse the given url and return a pathInfo object. Sanity checks are
 * performed.
 *
 * @param urlStr - URL to parse
 * @param expectKey - whether the command expects to see a
 *   key in the URL
 * @return a pathInfo object with URL items containing the
 * following attributes:
 *   - pathInfo.service {String} - The name of REST service ("DataFile")
 *   - pathInfo.key {String} - The requested key
 */
 export function parseURL(urlStr: string, expectKey: boolean) {
    const urlObj = url.parse(urlStr);
    const pathInfo = explodePath(decodeURI(urlObj.path!));
    if ((pathInfo.service !== constants.dataFileURL)
        && (pathInfo.service !== constants.passthroughFileURL)) {
        throw errors.InvalidAction.customizeDescription(
            `unsupported service '${pathInfo.service}'`);
    }
    if (expectKey && pathInfo.key === undefined) {
        throw errors.MissingParameter.customizeDescription(
            'URL is missing key');
    }
    if (!expectKey && pathInfo.key !== undefined) {
        // note: we may implement rewrite functionality by allowing a
        // key in the URL, though we may still provide the new key in
        // the Location header to keep immutability property and
        // atomicity of the update (we would just remove the old
        // object when the new one has been written entirely in this
        // case, saving a request over an equivalent PUT + DELETE).
        throw errors.InvalidURI.customizeDescription(
            'PUT url cannot contain a key');
    }
    return pathInfo;
 }
--- a/lib/network/rpc/rpc.ts
+++ b/lib/network/rpc/rpc.ts
@ -1,6 +1,6 @@
 import ioClient from 'socket.io-client';
 import * as http from 'http';
-import { Server as IOServer } from 'socket.io';
+import io from 'socket.io';
 import * as sioStream from './sio-stream';
 import async from 'async';
 import assert from 'assert';
@ -497,7 +497,7 @@ export function RPCServer(params: {
    assert(params.logger);
    const httpServer = http.createServer();
-    const server = new IOServer(httpServer, { maxHttpBufferSize: 1e8 });
+    const server = io(httpServer);
    const log = params.logger;
    /**
@ -508,7 +508,7 @@ export function RPCServer(params: {
     *
     * @param {BaseService} serviceList - list of services to register
     */
-    (server as any).registerServices = function registerServices(...serviceList: any[]) {
+    server.registerServices = function registerServices(...serviceList: any[]) {
        serviceList.forEach(service => {
            const sock = this.of(service.namespace);
            sock.on('connection', conn => {
@ -536,7 +536,7 @@ export function RPCServer(params: {
        });
    };
-    (server as any).listen = function listen(port, bindAddress = undefined) {
+    server.listen = function listen(port, bindAddress = undefined) {
        httpServer.listen(port, bindAddress);
    };
--- a/lib/patches/locationConstraints.ts
+++ b/lib/patches/locationConstraints.ts
@ -1,209 +0,0 @@
 import { URL } from 'url';
 import { decryptSecret } from '../executables/pensieveCreds/utils';
 import { Logger } from 'werelogs';
 export type LocationType =
    | 'location-mem-v1'
    | 'location-file-v1'
    | 'location-azure-v1'
    | 'location-ceph-radosgw-s3-v1'
    | 'location-scality-ring-s3-v1'
    | 'location-aws-s3-v1'
    | 'location-wasabi-v1'
    | 'location-do-spaces-v1'
    | 'location-gcp-v1'
    | 'location-scality-sproxyd-v1'
    | 'location-nfs-mount-v1'
    | 'location-scality-hdclient-v2';
 export interface OverlayLocations {
    [key: string]: {
        name: string;
        objectId: string;
        details?: any;
        locationType: string;
        sizeLimitGB?: number;
        isTransient?: boolean;
        legacyAwsBehavior?: boolean;
    };
 }
 export type Location = {
    type:
        | 'mem'
        | 'file'
        | 'azure'
        | 'aws_s3'
        | 'gcp'
        | 'scality'
        | 'pfs'
        | 'scality';
    name: string;
    objectId: string;
    details: { [key: string]: any };
    locationType: string;
    sizeLimitGB: number | null;
    isTransient: boolean;
    legacyAwsBehavior: boolean;
 };
 export function patchLocations(
    overlayLocations: OverlayLocations | undefined | null,
    creds: any,
    log: Logger
 ) {
    const locs = overlayLocations ?? {};
    return Object.entries(locs).reduce<{ [key: string]: Location }>(
        (acc, [k, l]) => {
            const location: Location = {
                type: 'mem',
                name: k,
                objectId: l.objectId,
                details: l.details || {},
                locationType: l.locationType,
                sizeLimitGB: l.sizeLimitGB || null,
                isTransient: Boolean(l.isTransient),
                legacyAwsBehavior: Boolean(l.legacyAwsBehavior),
            };
            let supportsVersioning = false;
            let pathStyle = process.env.CI_CEPH !== undefined;
            switch (l.locationType) {
                case 'location-mem-v1':
                    location.type = 'mem';
                    location.details = { supportsVersioning: true };
                    break;
                case 'location-file-v1':
                    location.type = 'file';
                    location.details = { supportsVersioning: true };
                    break;
                case 'location-azure-v1':
                    location.type = 'azure';
                    if (l.details.secretKey && l.details.secretKey.length > 0) {
                        location.details = {
                            bucketMatch: l.details.bucketMatch,
                            azureStorageEndpoint: l.details.endpoint,
                            azureStorageAccountName: l.details.accessKey,
                            azureStorageAccessKey: decryptSecret(
                                creds,
                                l.details.secretKey
                            ),
                            azureContainerName: l.details.bucketName,
                        };
                    }
                    break;
                case 'location-ceph-radosgw-s3-v1':
                case 'location-scality-ring-s3-v1':
                    pathStyle = true; // fallthrough
                case 'location-aws-s3-v1':
                case 'location-wasabi-v1':
                    supportsVersioning = true; // fallthrough
                case 'location-do-spaces-v1':
                    location.type = 'aws_s3';
                    if (l.details.secretKey && l.details.secretKey.length > 0) {
                        let https = true;
                        let awsEndpoint =
                            l.details.endpoint || 's3.amazonaws.com';
                        if (awsEndpoint.includes('://')) {
                            const url = new URL(awsEndpoint);
                            awsEndpoint = url.host;
                            https = url.protocol.includes('https');
                        }
                        location.details = {
                            credentials: {
                                accessKey: l.details.accessKey,
                                secretKey: decryptSecret(
                                    creds,
                                    l.details.secretKey
                                ),
                            },
                            bucketName: l.details.bucketName,
                            bucketMatch: l.details.bucketMatch,
                            serverSideEncryption: Boolean(
                                l.details.serverSideEncryption
                            ),
                            region: l.details.region,
                            awsEndpoint,
                            supportsVersioning,
                            pathStyle,
                            https,
                        };
                    }
                    break;
                case 'location-gcp-v1':
                    location.type = 'gcp';
                    if (l.details.secretKey && l.details.secretKey.length > 0) {
                        location.details = {
                            credentials: {
                                accessKey: l.details.accessKey,
                                secretKey: decryptSecret(
                                    creds,
                                    l.details.secretKey
                                ),
                            },
                            bucketName: l.details.bucketName,
                            mpuBucketName: l.details.mpuBucketName,
                            bucketMatch: l.details.bucketMatch,
                            gcpEndpoint:
                                l.details.endpoint || 'storage.googleapis.com',
                            https: true,
                        };
                    }
                    break;
                case 'location-scality-sproxyd-v1':
                    location.type = 'scality';
                    if (
                        l.details &&
                        l.details.bootstrapList &&
                        l.details.proxyPath
                    ) {
                        location.details = {
                            supportsVersioning: true,
                            connector: {
                                sproxyd: {
                                    chordCos: l.details.chordCos || null,
                                    bootstrap: l.details.bootstrapList,
                                    path: l.details.proxyPath,
                                },
                            },
                        };
                    }
                    break;
                case 'location-nfs-mount-v1':
                    location.type = 'pfs';
                    if (l.details) {
                        location.details = {
                            supportsVersioning: true,
                            bucketMatch: true,
                            pfsDaemonEndpoint: {
                                host: `${l.name}-cosmos-pfsd`,
                                port: 80,
                            },
                        };
                    }
                    break;
                case 'location-scality-hdclient-v2':
                    location.type = 'scality';
                    if (l.details && l.details.bootstrapList) {
                        location.details = {
                            supportsVersioning: true,
                            connector: {
                                hdclient: {
                                    bootstrap: l.details.bootstrapList,
                                },
                            },
                        };
                    }
                    break;
                default:
                    log.info('unknown location type', {
                        locationType: l.locationType,
                    });
                    return acc;
            }
            return { ...acc, [location.name]: location };
        },
        {}
    );
 }
--- a/lib/policy/resourcePolicySchema.json
+++ b/lib/policy/resourcePolicySchema.json
@ -38,7 +38,7 @@
        },
        "principalAWSUserArn": {
            "type": "string",
-            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,2017}$"
+            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,64}$"
        },
        "principalAWSRoleArn": {
            "type": "string",
@ -360,9 +360,6 @@
            "type": "string",
            "const": "2012-10-17"
        },
        "Id": {
            "type": "string"
        },
        "Statement": {
            "oneOf": [
                {
--- a/lib/policy/userPolicySchema.json
+++ b/lib/policy/userPolicySchema.json
@ -28,7 +28,7 @@
        },
        "principalAWSUserArn": {
            "type": "string",
-            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,2017}$"
+            "pattern": "^arn:aws:iam::[0-9]{12}:user/(?!\\*)[\\w+=,.@ -/]{1,64}$"
        },
        "principalAWSRoleArn": {
            "type": "string",
@ -38,10 +38,6 @@
            "type": "string",
            "pattern": "^arn:aws:iam::[0-9]{12}:saml-provider/[\\w._-]{1,128}$"
        },
        "principalFederatedOidcIdp": {
            "type": "string",
            "pattern": "^(?:http(s)?:\/\/)?[\\w.-]+(?:\\.[\\w\\.-]+)+[\\w\\-\\._~:/?#[\\]@!\\$&'\\(\\)\\*\\+,;=.]+$"
        },
        "principalAWSItem": {
            "type": "object",
            "properties": {
@ -102,9 +98,6 @@
                    "oneOf": [
                        {
                            "$ref": "#/definitions/principalFederatedSamlIdp"
                        },
                        {
                            "$ref": "#/definitions/principalFederatedOidcIdp"
                        }
                    ]
                }
--- a/lib/policyEvaluator/RequestContext.ts
+++ b/lib/policyEvaluator/RequestContext.ts
@ -12,39 +12,13 @@ import {
    actionMapSSO,
    actionMapSTS,
    actionMapMetadata,
    actionMapScuba,
 } from './utils/actionMaps';
-export const actionNeedQuotaCheck = {
+const _actionNeedQuotaCheck = {
    objectPut: true,
    objectPutVersion: true,
    objectPutPart: true,
    objectRestore: true,
 };
 /**
 * This variable describes APIs that change the bytes
 * stored, requiring quota updates
 */
 export const actionWithDataDeletion = {
    objectDelete: true,
    objectDeleteVersion: true,
    multipartDelete: true,
    multiObjectDelete: true,
 };
 /**
 * The function returns true if the current API call is a copy object
 * and the action requires a quota evaluation logic, post retrieval
 * of the object metadata.
 * @param {string} action - the action being performed
 * @param {string} currentApi - the current API being called
 * @return {boolean} - whether the action requires a quota check
 */
 export function actionNeedQuotaCheckCopy(action: string, currentApi: string) {
    return action === 'objectGet' && (currentApi === 'objectCopy' || currentApi === 'objectPutCopyPart');
 }
 function _findAction(service: string, method: string) {
    switch (service) {
        case 's3':
@ -62,8 +36,6 @@ function _findAction(service: string, method: string) {
            return actionMapSTS[method];
        case 'metadata':
            return actionMapMetadata[method];
        case 'scuba':
            return actionMapScuba[method];
        default:
            return undefined;
    }
@ -133,10 +105,6 @@ function _buildArn(
            return `arn:scality:metadata::${requesterInfo!.accountid}:` +
            `${generalResource}/`;
        }
        case 'scuba': {
            return `arn:scality:scuba::${requesterInfo!.accountid}:` +
            `${generalResource}${specificResource ? '/' + specificResource : ''}`;
        }
        default:
            return undefined;
    }
@ -151,9 +119,7 @@ export type RequesterInfo = {
    principalType: string;
    principaltype: string;
    userid: string;
-    username: string;
+    username: string,
    keycloakGroup: string;
    keycloakRole: 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
+        this._needQuota = _actionNeedQuotaCheck[apiMethod] === true;
            || actionWithDataDeletion[apiMethod] === true;
        this._requestObjTags = requestObjTags || null;
        this._existingObjTag = existingObjTag || null;
        this._needTagEval = needTagEval || false;
        this._objectLockRetentionDays = objectLockRetentionDays || null;
        return this;
    }
@ -293,7 +255,6 @@ export default class RequestContext {
            requestObjTags: this._requestObjTags,
            existingObjTag: this._existingObjTag,
            needTagEval: this._needTagEval,
            objectLockRetentionDays: this._objectLockRetentionDays,
        };
        return JSON.stringify(requestInfo);
    }
@ -334,7 +295,6 @@ export default class RequestContext {
            obj.requestObjTags,
            obj.existingObjTag,
            obj.needTagEval,
            obj.objectLockRetentionDays,
        );
    }
@ -738,24 +698,4 @@ export default class RequestContext {
    getNeedTagEval() {
        return this._needTagEval;
    }
    /**
     * Get object lock retention days
     *
     * @returns objectLockRetentionDays - object lock retention days 
     */
    getObjectLockRetentionDays() {
        return this._objectLockRetentionDays;
    }
    /**
     * Set object lock retention days
     *
     * @param objectLockRetentionDays - object lock retention days
     * @returns itself
     */
    setObjectLockRetentionDays(objectLockRetentionDays: number) {
        this._objectLockRetentionDays = objectLockRetentionDays;
        return this;
    }
 }
--- a/lib/policyEvaluator/evaluator.ts
+++ b/lib/policyEvaluator/evaluator.ts
@ -310,7 +310,6 @@ export function evaluatePolicy(
 }
 /**
 * @deprecated Upgrade to standardEvaluateAllPolicies
 * Evaluate whether a request is permitted under a policy.
 * @param requestContext - Info necessary to
 * evaluate permission
@ -326,16 +325,6 @@ export function evaluateAllPolicies(
    allPolicies: any[],
    log: Logger,
 ): string {
    return standardEvaluateAllPolicies(requestContext, allPolicies, log).verdict;
 }
 export function standardEvaluateAllPolicies(
    requestContext: RequestContext,
    allPolicies: any[],
    log: Logger,
 ): {
    verdict: string;
    isImplicit: boolean;
 } {
    log.trace('evaluating all policies');
    let allow = false;
    let allowWithTagCondition = false;
@ -344,10 +333,7 @@ export function standardEvaluateAllPolicies(
        const singlePolicyVerdict = evaluatePolicy(requestContext, allPolicies[i], log);
        // If there is any Deny, just return Deny
        if (singlePolicyVerdict === 'Deny') {
-            return {
+            return 'Deny';
                verdict: 'Deny',
                isImplicit: false,
            };
        }
        if (singlePolicyVerdict === 'Allow') {
            allow = true;
@ -358,7 +344,6 @@ export function standardEvaluateAllPolicies(
        } // else 'Neutral'
    }
    let verdict;
    let isImplicit = false;
    if (allow) {
        if (denyWithTagCondition) {
            verdict = 'NeedTagConditionEval';
@ -370,9 +355,8 @@ export function standardEvaluateAllPolicies(
            verdict = 'NeedTagConditionEval';
        } else {
            verdict = 'Deny';
            isImplicit = true;
        }
    }
-    log.trace('result of evaluating all policies', { verdict, isImplicit });
+    log.trace('result of evaluating all policies', { verdict });
-    return { verdict, isImplicit };
+    return verdict;
 }
--- a/lib/policyEvaluator/utils/actionMaps.ts
+++ b/lib/policyEvaluator/utils/actionMaps.ts
@ -4,14 +4,14 @@ const sharedActionMap = {
    bucketDeleteEncryption: 's3:PutEncryptionConfiguration',
    bucketDeletePolicy: 's3:DeleteBucketPolicy',
    bucketDeleteWebsite: 's3:DeleteBucketWebsite',
-    bucketDeleteTagging: 's3:PutBucketTagging',
+    bucketDeleteTagging: 's3:DeleteBucketTagging',
    bucketGet: 's3:ListBucket',
    bucketGetACL: 's3:GetBucketAcl',
    bucketGetCors: 's3:GetBucketCORS',
    bucketGetEncryption: 's3:GetEncryptionConfiguration',
    bucketGetLifecycle: 's3:GetLifecycleConfiguration',
    bucketGetLocation: 's3:GetBucketLocation',
-    bucketGetNotification: 's3:GetBucketNotification',
+    bucketGetNotification: 's3:GetBucketNotificationConfiguration',
    bucketGetObjectLock: 's3:GetBucketObjectLockConfiguration',
    bucketGetPolicy: 's3:GetBucketPolicy',
    bucketGetReplication: 's3:GetReplicationConfiguration',
@ -23,7 +23,7 @@ const sharedActionMap = {
    bucketPutCors: 's3:PutBucketCORS',
    bucketPutEncryption: 's3:PutEncryptionConfiguration',
    bucketPutLifecycle: 's3:PutLifecycleConfiguration',
-    bucketPutNotification: 's3:PutBucketNotification',
+    bucketPutNotification: 's3:PutBucketNotificationConfiguration',
    bucketPutObjectLock: 's3:PutBucketObjectLockConfiguration',
    bucketPutPolicy: 's3:PutBucketPolicy',
    bucketPutReplication: 's3:PutReplicationConfiguration',
@ -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',
@ -42,20 +41,11 @@ const sharedActionMap = {
    objectGetLegalHold: 's3:GetObjectLegalHold',
    objectGetRetention: 's3:GetObjectRetention',
    objectGetTagging: 's3:GetObjectTagging',
    objectHead: 's3:GetObject',
    objectPut: 's3:PutObject',
    objectPutACL: 's3:PutObjectAcl',
    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
@ -65,35 +55,36 @@ const actionMapRQ = {
    // see http://docs.aws.amazon.com/AmazonS3/latest/API/
    // RESTBucketDELETEcors.html
    bucketDeleteCors: 's3:PutBucketCORS',
-    bucketDeleteReplication: 's3:PutReplicationConfiguration',
+    bucketDeleteReplication: 's3:DeleteReplicationConfiguration',
-    bucketDeleteLifecycle: 's3:PutLifecycleConfiguration',
+    bucketDeleteLifecycle: 's3:DeleteLifecycleConfiguration',
    completeMultipartUpload: 's3:PutObject',
    initiateMultipartUpload: 's3:PutObject',
    objectDeleteVersion: 's3:DeleteObjectVersion',
    objectDeleteTaggingVersion: 's3:DeleteObjectVersionTagging',
    objectGetArchiveInfo: 'scality:GetObjectArchiveInfo',
    objectGetVersion: 's3:GetObjectVersion',
    objectGetACLVersion: 's3:GetObjectVersionAcl',
    objectGetTaggingVersion: 's3:GetObjectVersionTagging',
    objectHead: 's3:GetObject',
    objectPutACLVersion: 's3:PutObjectVersionAcl',
    objectPutPart: 's3:PutObject',
    objectPutTaggingVersion: 's3:PutObjectVersionTagging',
    serviceGet: 's3:ListAllMyBuckets',
    objectReplicate: 's3:ReplicateObject',
-    objectGetRetentionVersion: 's3:GetObjectRetention',
+    objectPutRetentionVersion: 's3:PutObjectVersionRetention',
-    objectPutRetentionVersion: 's3:PutObjectRetention',
+    objectPutLegalHoldVersion: 's3:PutObjectVersionLegalHold',
    objectGetLegalHoldVersion: 's3:GetObjectLegalHold',
    objectPutLegalHoldVersion: 's3:PutObjectLegalHold',
    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 = {
    // TODO
    // @ts-ignore
    bucketGetNotification: 's3:GetBucketNotification',
    // @ts-ignore
    bucketPutNotification: 's3:PutBucketNotification',
    ...sharedActionMap,
    ...actionMapRQ,
    ...actionMapBP,
@ -113,7 +104,7 @@ const actionMonitoringMapS3 = {
    bucketGetCors: 'GetBucketCors',
    bucketGetLifecycle: 'GetBucketLifecycleConfiguration',
    bucketGetLocation: 'GetBucketLocation',
-    bucketGetNotification: 'GetBucketNotification',
+    bucketGetNotification: 'GetBucketNotificationConfiguration',
    bucketGetObjectLock: 'GetObjectLockConfiguration',
    bucketGetPolicy: 'GetBucketPolicy',
    bucketGetReplication: 'GetBucketReplication',
@ -126,7 +117,7 @@ const actionMonitoringMapS3 = {
    bucketPutACL: 'PutBucketAcl',
    bucketPutCors: 'PutBucketCors',
    bucketPutLifecycle: 'PutBucketLifecycleConfiguration',
-    bucketPutNotification: 'PutBucketNotification',
+    bucketPutNotification: 'PutBucketNotificationConfiguration',
    bucketPutObjectLock: 'PutObjectLockConfiguration',
    bucketPutPolicy: 'PutBucketPolicy',
    bucketPutReplication: 'PutBucketReplication',
@ -138,7 +129,6 @@ const actionMonitoringMapS3 = {
    initiateMultipartUpload: 'CreateMultipartUpload',
    listMultipartUploads: 'ListMultipartUploads',
    listParts: 'ListParts',
    metadataSearch: 'MetadataSearch',
    multiObjectDelete: 'DeleteObjects',
    multipartDelete: 'AbortMultipartUpload',
    objectCopy: 'CopyObject',
@ -157,17 +147,7 @@ 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 +172,6 @@ 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 +190,6 @@ const actionMapIAM = {
    tagUser: 'iam:TagUser',
    unTagUser: 'iam:UntagUser',
    listUserTags: 'iam:ListUserTags',
    ...actionMapAccountQuotas,
 };
 const actionMapSSO = {
@ -227,14 +205,6 @@ 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 +214,4 @@ 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])
+        if (j === 4 && policyArnArr[2] === 'utapi' && policyArnArr[4] === '') {
            && 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 = (
+// TODO Better type this
    s3Method: string,
    azureMethod: string,
    command: (client: azure.ContainerClient) => Promise<any>,
    log: RequestLogger,
    cb: (err: ArsenalError | null | undefined) => void,
 ) => void
 export const putSinglePart = (
-    errorWrapperFn: ErrorWrapperFn,
+    errorWrapperFn: (first: string, second: string, third: any, log: any, cb: any) => void,
-    request: stream.Readable,
+    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 => {
+    return errorWrapperFn('uploadPart', 'createBlockFromStream',
-        try {
+        [blockId, bucketName, objectKey, passThrough, size, options,
-            const result = await client.getBlockBlobClient(objectKey)
+            (err: any | null, result: any) => {
-                .stageBlock(blockId, () => passThrough, size, options);
+                if (err) {
            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;
+                        return cb(errors.NoSuchBucket);
                    }
                    if (err.code === 'InvalidMd5') {
-                throw errors.InvalidDigest;
+                        return cb(errors.InvalidDigest);
                    }
                    if (err.code === 'Md5Mismatch') {
-                throw errors.BadDigest;
+                        return cb(errors.BadDigest);
                    }
-            throw errors.InternalError.customizeDescription(
+                    return cb(errors.InternalError.customizeDescription(
-                `Error returned from Azure: ${err.message}`
+                        `Error returned from Azure: ${err.message}`),
                    );
                }
-    }, log, cb);
+                const md5 = result.headers['content-md5'] || '';
                const eTag = objectUtils.getHexMD5(md5);
                return cb(null, eTag, size);
            }], log, cb);
 };
-const putNextSubPart = (
+// TODO type this
-    errorWrapperFn: ErrorWrapperFn,
+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 => {
+    errorWrapperFn('uploadPart', 'createBlockFromStream',
-        try {
+        [subPartId, bucketName, objectKey, subPartStream, subPartSize,
-            const result = await client.getBlockBlobClient(objectKey)
+            {}, err => resultsCollector.pushResult(err, subPartIndex)], log, cb);
                .stageBlock(subPartId, () => subPartStream, subPartSize, {});
            resultsCollector.pushResult(null, subPartIndex);
        } catch (err: any) {
            resultsCollector.pushResult(err, subPartIndex);
        }
    }, log, () => {});
 };
 export const putSubParts = (
-    errorWrapperFn: ErrorWrapperFn,
+    errorWrapperFn: any,
-    request: stream.Readable,
+    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,
+            putNextSubPart(errorWrapperFn, params, subPartInfo,
-                subPartIndex, resultsCollector, log);
+                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 oneDay = 24 * 60 * 60 * 1000; // Milliseconds in a day.
 const msInOneDay = 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;
+            const timeTravel = this._transitionOneDayEarlier ? -oneDay : 0;
-            return lastModifiedTime + (transition.Days * this._scaledMsPerDay) + timeTravel;
+            return lastModifiedTime + (transition.Days * oneDay) + 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;
        }
    }
 }
--- 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)
@ -284,7 +207,6 @@ export default class LifecycleUtils {
                // Names are long, so obscuring a bit
                const ncve = 'NoncurrentVersionExpiration';
                const ncd = 'NoncurrentDays';
                const nncv = 'NewerNoncurrentVersions';
                if (!store[ncve]) {
                    store[ncve] = {};
@ -292,7 +214,6 @@ export default class LifecycleUtils {
                if (!store[ncve][ncd] || rule[ncve][ncd] < store[ncve][ncd]) {
                    store[ncve].ID = rule.ID;
                    store[ncve][ncd] = rule[ncve][ncd];
                    store[ncve][nncv] = rule[ncve][nncv];
                }
            }
            if (rule.AbortIncompleteMultipartUpload
@ -318,17 +239,7 @@ export default class LifecycleUtils {
                    currentDate,
                });
            }
-
+            // TODO: Add support for NoncurrentVersionTransitions.
            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,
                });
            }
            return store;
        }, {});
        // Do not transition to a location where the object is already stored.
@ -336,12 +247,6 @@ 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 getHexMD5 = (base64MD5: WithImplicitCoercion<string>) =>
-
+    Buffer.from(base64MD5, 'base64').toString('hex');
 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 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(
+        return errors.InvalidTag.customizeDescription('Cannot provide ' +
-            'Cannot provide multiple Tags with the same key'
+        '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 } =
+    const modifiedSinceRes = _checkModifiedSince(ifModifiedSinceHeader?.toString(), millis);
-        checkDateModifiedHeaders(headers, lastModified);
+    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('Object key ' +
-                return errors.InvalidArgument.customizeDescription('Invalid ' +
+            `must not start with "${result.invalidPrefix}".`);
                    '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}.`);
        }
    }
    if ((reqQuery.partNumber || reqQuery.uploadId)
@ -219,8 +210,7 @@ export default function routes(
        // @ts-ignore
        logger.newRequestLogger());
-    if (!req.url!.startsWith('/_/healthcheck') &&
+    if (!req.url!.startsWith('/_/healthcheck')) {
        !req.url!.startsWith('/_/report')) {
        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/Show More
+++ b/Show More
Author	SHA1	Message	Date
williamlardier	7be560cdef	test	2022-09-14 12:22:14 +02:00
williamlardier	4b19cd6777	test	2022-09-07 11:18:30 +02:00
williamlardier	bf82a803ed	test	2022-09-07 10:56:53 +02:00