Merge pull request #17958 from overleaf/mj-web-revert-file

[web] Initial version of file reverting

GitOrigin-RevId: ef500b2c3ddf21b0acb6650c2526edd10ab2cc18

libraries/overleaf-editor-core/index.js

@@ -38,7 +38,9 @@ const {
 } = require('./lib/operation/scan_op')
 const TrackedChange = require('./lib/file_data/tracked_change')
 const TrackedChangeList = require('./lib/file_data/tracked_change_list')
+const TrackingProps = require('./lib/file_data/tracking_props')
 const Range = require('./lib/range')
+const CommentList = require('./lib/file_data/comment_list')
 
 exports.AddCommentOperation = AddCommentOperation
 exports.Author = Author
@@ -79,3 +81,5 @@ exports.RemoveOp = RemoveOp
 exports.TrackedChangeList = TrackedChangeList
 exports.TrackedChange = TrackedChange
 exports.Range = Range
+exports.CommentList = CommentList
+exports.TrackingProps = TrackingProps

services/document-updater/app/js/ProjectHistoryRedisManager.js

@@ -86,9 +86,19 @@ const ProjectHistoryRedisManager = {
     projectUpdate,
     source
   ) {
+    let docLines = projectUpdate.docLines
+    let ranges
+    if (projectUpdate.historyRangesSupport && projectUpdate.ranges) {
+      docLines = addTrackedDeletesToContent(
+        docLines,
+        projectUpdate.ranges.changes ?? []
+      )
+      ranges = HistoryConversions.toHistoryRanges(projectUpdate.ranges)
+    }
+
     projectUpdate = {
       pathname: projectUpdate.pathname,
-      docLines: projectUpdate.docLines,
+      docLines,
       url: projectUpdate.url,
       meta: {
         user_id: userId,
@@ -97,6 +107,9 @@ const ProjectHistoryRedisManager = {
       version: projectUpdate.version,
       projectHistoryId,
     }
+    if (ranges) {
+      projectUpdate.ranges = ranges
+    }
     projectUpdate[entityType] = entityId
     if (source != null) {
       projectUpdate.meta.source = source

services/document-updater/app/js/types.ts

@@ -41,6 +41,8 @@ export type CommentOp = {
   p: number
   t: string
   u?: boolean
+  // Used by project-history when restoring CommentSnapshots
+  resolved?: boolean
 }
 
 /**
@@ -54,7 +56,7 @@ export type Ranges = {
 export type Comment = {
   id: string
   op: CommentOp
-  metadata: {
+  metadata?: {
     user_id: string
     ts: string
   }

services/document-updater/test/unit/js/ProjectHistoryRedisManager/ProjectHistoryRedisManagerTests.js

@@ -125,19 +125,22 @@ describe('ProjectHistoryRedisManager', function () {
   })
 
   describe('queueAddEntity', function () {
-    beforeEach(async function () {
+    beforeEach(function () {
       this.doc_id = 1234
 
       this.rawUpdate = {
         pathname: (this.pathname = '/old'),
         docLines: (this.docLines = 'a\nb'),
         version: (this.version = 2),
-        url: (this.url = 'filestore.example.com'),
       }
 
       this.ProjectHistoryRedisManager.promises.queueOps = sinon
         .stub()
         .resolves()
+    })
+
+    it('should queue an update', async function () {
+      this.rawUpdate.url = this.url = 'filestore.example.com'
       await this.ProjectHistoryRedisManager.promises.queueAddEntity(
         this.project_id,
         this.projectHistoryId,
@@ -147,9 +150,7 @@ describe('ProjectHistoryRedisManager', function () {
         this.rawUpdate,
         this.source
       )
-    })
 
-    it('should queue an update', function () {
       const update = {
         pathname: this.pathname,
         docLines: this.docLines,
@@ -169,6 +170,190 @@ describe('ProjectHistoryRedisManager', function () {
         .should.equal(true)
     })
 
+    it('should forward history compatible ranges if history ranges support is enabled', async function () {
+      this.rawUpdate.historyRangesSupport = true
+      this.docLines = 'the quick fox jumps over the lazy dog'
+
+      const ranges = {
+        changes: [
+          {
+            op: { p: 4, i: 'quick' },
+            metadata: { ts: '2024-01-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+          {
+            op: { p: 9, d: ' brown' },
+            metadata: { ts: '2024-02-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+          {
+            op: { p: 14, i: 'jumps' },
+            metadata: { ts: '2024-02-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+        ],
+        comments: [
+          {
+            op: { p: 29, c: 'lazy', t: 'comment-1' },
+            metadata: { resolved: false },
+          },
+        ],
+      }
+      this.rawUpdate.ranges = ranges
+      this.rawUpdate.docLines = this.docLines
+
+      await this.ProjectHistoryRedisManager.promises.queueAddEntity(
+        this.project_id,
+        this.projectHistoryId,
+        'doc',
+        this.doc_id,
+        this.user_id,
+        this.rawUpdate,
+        this.source
+      )
+
+      const historyCompatibleRanges = {
+        comments: [
+          {
+            op: { p: 29, c: 'lazy', t: 'comment-1', hpos: 35 },
+            metadata: { resolved: false },
+          },
+        ],
+        changes: [
+          {
+            op: { p: 4, i: 'quick' },
+            metadata: { ts: '2024-01-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+          {
+            op: { p: 9, d: ' brown' },
+            metadata: { ts: '2024-02-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+          {
+            op: { p: 14, i: 'jumps', hpos: 20 },
+            metadata: { ts: '2024-02-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+        ],
+      }
+
+      const update = {
+        pathname: this.pathname,
+        docLines: 'the quick brown fox jumps over the lazy dog',
+        meta: {
+          user_id: this.user_id,
+          ts: new Date(),
+          source: this.source,
+        },
+        version: this.version,
+        projectHistoryId: this.projectHistoryId,
+        ranges: historyCompatibleRanges,
+        doc: this.doc_id,
+      }
+
+      expect(
+        this.ProjectHistoryRedisManager.promises.queueOps
+      ).to.have.been.calledWithExactly(this.project_id, JSON.stringify(update))
+    })
+
+    it('should not forward ranges if history ranges support is disabled', async function () {
+      this.rawUpdate.historyRangesSupport = false
+
+      const ranges = {
+        changes: [
+          {
+            op: { p: 0, i: 'foo' },
+            metadata: { ts: '2024-01-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+          {
+            op: { p: 7, d: ' baz' },
+            metadata: { ts: '2024-02-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+        ],
+        comments: [
+          {
+            op: { p: 4, c: 'bar', t: 'comment-1' },
+            metadata: { resolved: false },
+          },
+        ],
+      }
+      this.rawUpdate.ranges = ranges
+
+      await this.ProjectHistoryRedisManager.promises.queueAddEntity(
+        this.project_id,
+        this.projectHistoryId,
+        'doc',
+        this.doc_id,
+        this.user_id,
+        this.rawUpdate,
+        this.source
+      )
+
+      const update = {
+        pathname: this.pathname,
+        docLines: this.docLines,
+        meta: {
+          user_id: this.user_id,
+          ts: new Date(),
+          source: this.source,
+        },
+        version: this.version,
+        projectHistoryId: this.projectHistoryId,
+        doc: this.doc_id,
+      }
+
+      this.ProjectHistoryRedisManager.promises.queueOps
+        .calledWithExactly(this.project_id, JSON.stringify(update))
+        .should.equal(true)
+    })
+
+    it('should not forward ranges if history ranges support is undefined', async function () {
+      this.rawUpdate.historyRangesSupport = false
+
+      const ranges = {
+        changes: [
+          {
+            op: { p: 0, i: 'foo' },
+            metadata: { ts: '2024-01-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+          {
+            op: { p: 7, d: ' baz' },
+            metadata: { ts: '2024-02-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+        ],
+        comments: [
+          {
+            op: { p: 4, c: 'bar', t: 'comment-1' },
+            metadata: { resolved: false },
+          },
+        ],
+      }
+      this.rawUpdate.ranges = ranges
+
+      await this.ProjectHistoryRedisManager.promises.queueAddEntity(
+        this.project_id,
+        this.projectHistoryId,
+        'doc',
+        this.doc_id,
+        this.user_id,
+        this.rawUpdate,
+        this.source
+      )
+
+      const update = {
+        pathname: this.pathname,
+        docLines: this.docLines,
+        meta: {
+          user_id: this.user_id,
+          ts: new Date(),
+          source: this.source,
+        },
+        version: this.version,
+        projectHistoryId: this.projectHistoryId,
+        doc: this.doc_id,
+      }
+
+      this.ProjectHistoryRedisManager.promises.queueOps
+        .calledWithExactly(this.project_id, JSON.stringify(update))
+        .should.equal(true)
+    })
+  })
+
   describe('queueResyncProjectStructure', function () {
     it('should queue an update', function () {})
   })
@@ -299,6 +484,11 @@ describe('ProjectHistoryRedisManager', function () {
           this.settings.max_doc_length
         )
       })
+
+      it('should queue an update', function () {
+        this.ProjectHistoryRedisManager.promises.queueOps
+          .calledWithExactly(this.project_id, JSON.stringify(this.update))
+          .should.equal(true)
       })
     })
   })

services/project-history/app/js/BlobManager.js

@@ -59,7 +59,7 @@ export function createBlobsForUpdates(
             projectId,
             historyId,
             update,
-            (err, hash) => {
+            (err, hashes) => {
               if (err) {
                 OError.tag(err, 'retry: error creating blob', {
                   projectId,
@@ -68,18 +68,18 @@ export function createBlobsForUpdates(
                 })
                 _cb(err)
               } else {
-                _cb(null, hash)
+                _cb(null, hashes)
               }
             }
           )
         })
       },
-      (error, blobHash) => {
+      (error, blobHashes) => {
         if (error) {
           if (!firstBlobCreationError) {
             firstBlobCreationError = error
           }
-          return cb(null, { update, blobHash })
+          return cb(null, { update, blobHashes })
         }
 
         extendLock(error => {
@@ -88,7 +88,7 @@ export function createBlobsForUpdates(
               firstBlobCreationError = error
             }
           }
-          cb(null, { update, blobHash })
+          cb(null, { update, blobHashes })
         })
       }
     )

services/project-history/app/js/HistoryBlobTranslator.js

@@ -0,0 +1,122 @@
+// @ts-check
+
+import {
+  Range,
+  TrackedChange,
+  TrackedChangeList,
+  CommentList,
+  Comment,
+  TrackingProps,
+} from 'overleaf-editor-core'
+import logger from '@overleaf/logger'
+import OError from '@overleaf/o-error'
+
+/**
+ * @typedef {import('./types').AddDocUpdate} AddDocUpdate
+ * @typedef {import('overleaf-editor-core/lib/types').CommentRawData} CommentRawData
+ * @typedef {import('overleaf-editor-core/lib/types').TrackedChangeRawData} TrackedChangeRawData
+ * */
+
+/**
+ *
+ * @param {AddDocUpdate} update
+ * @returns {{trackedChanges: TrackedChangeRawData[], comments: CommentRawData[]} | undefined}
+ */
+export function createRangeBlobDataFromUpdate(update) {
+  logger.debug({ update }, 'createBlobDataFromUpdate')
+
+  if (update.doc == null || update.docLines == null) {
+    throw new OError('Not an AddFileUpdate')
+  }
+  if (
+    !update.ranges ||
+    (update.ranges.changes == null && update.ranges.comments == null)
+  ) {
+    return undefined
+  }
+
+  if (
+    (!update.ranges.changes || update.ranges.changes.length === 0) &&
+    (!update.ranges.comments || update.ranges.comments.length === 0)
+  ) {
+    return undefined
+  }
+
+  const sortedRanges = [...(update.ranges.changes || [])].sort((a, b) => {
+    if (a.op.p !== b.op.p) {
+      return a.op.p - b.op.p
+    }
+    if ('i' in a.op && a.op.i != null && 'd' in b.op && b.op.d != null) {
+      // Move deletes before inserts
+      return 1
+    }
+    return -1
+  })
+
+  const tcList = new TrackedChangeList([])
+
+  for (const change of sortedRanges) {
+    if ('d' in change.op && change.op.d != null) {
+      const length = change.op.d.length
+      const range = new Range(change.op.hpos ?? change.op.p, length)
+      tcList.add(
+        new TrackedChange(
+          range,
+          new TrackingProps(
+            'delete',
+            change.metadata.user_id,
+            new Date(change.metadata.ts)
+          )
+        )
+      )
+    } else if ('i' in change.op && change.op.i != null) {
+      const length = change.op.i.length
+      const range = new Range(change.op.hpos ?? change.op.p, length)
+      tcList.add(
+        new TrackedChange(
+          range,
+          new TrackingProps(
+            'insert',
+            change.metadata.user_id,
+            new Date(change.metadata.ts)
+          )
+        )
+      )
+    }
+  }
+  const comments = [...(update.ranges.comments || [])].sort((a, b) => {
+    return a.op.p - b.op.p
+  })
+
+  /** @type {Map<string, {ranges: Range[], resolved: boolean}>} */
+  const commentMap = new Map()
+  for (const comment of comments) {
+    const range = new Range(
+      comment.op.hpos ?? comment.op.p,
+      comment.op.hlen ?? comment.op.c.length
+    )
+    const id = comment.op.t
+    if (!commentMap.has(id)) {
+      commentMap.set(id, {
+        ranges: [],
+        resolved: comment.op.resolved ?? false,
+      })
+    }
+    const entry = commentMap.get(id)
+    if (!entry) {
+      throw new Error('Comment entry not found')
+    }
+    if (entry.resolved !== (comment.op.resolved ?? false)) {
+      throw new Error('Mismatching resolved status for comment')
+    }
+    entry.ranges.push(range)
+  }
+  const commentList = new CommentList(
+    [...commentMap.entries()].map(
+      ([id, commentObj]) =>
+        new Comment(id, commentObj.ranges, commentObj.resolved)
+    )
+  )
+
+  return { trackedChanges: tcList.toRaw(), comments: commentList.toRaw() }
+}

services/project-history/app/js/HistoryStoreManager.js

@@ -16,6 +16,7 @@ import * as Versions from './Versions.js'
 import * as Errors from './Errors.js'
 import * as LocalFileWriter from './LocalFileWriter.js'
 import * as HashManager from './HashManager.js'
+import * as HistoryBlobTranslator from './HistoryBlobTranslator.js'
 
 const HTTP_REQUEST_TIMEOUT = Settings.apis.history_v1.requestTimeout
 
@@ -230,23 +231,61 @@ export function sendChanges(
   )
 }
 
-export function createBlobForUpdate(projectId, historyId, update, callback) {
+function createBlobFromString(historyId, data, fileId, callback) {
-  callback = _.once(callback)
-
-  if (update.doc != null && update.docLines != null) {
   const stringStream = new StringStream()
-    stringStream.push(update.docLines)
+  stringStream.push(data)
   stringStream.push(null)
-
   LocalFileWriter.bufferOnDisk(
     stringStream,
     '',
-      `project-${projectId}-doc-${update.doc}`,
+    fileId,
     (fsPath, cb) => {
       _createBlob(historyId, fsPath, cb)
     },
     callback
   )
+}
+
+export function createBlobForUpdate(projectId, historyId, update, callback) {
+  callback = _.once(callback)
+
+  if (update.doc != null && update.docLines != null) {
+    let ranges
+    try {
+      ranges = HistoryBlobTranslator.createRangeBlobDataFromUpdate(update)
+    } catch (error) {
+      return callback(error)
+    }
+    createBlobFromString(
+      historyId,
+      update.docLines,
+      `project-${projectId}-doc-${update.doc}`,
+      (err, fileHash) => {
+        if (err) {
+          return callback(err)
+        }
+        if (ranges) {
+          createBlobFromString(
+            historyId,
+            JSON.stringify(ranges),
+            `project-${projectId}-doc-${update.doc}-ranges`,
+            (err, rangesHash) => {
+              if (err) {
+                return callback(err)
+              }
+              logger.debug(
+                { fileHash, rangesHash },
+                'created blobs for both ranges and content'
+              )
+              return callback(null, { file: fileHash, ranges: rangesHash })
+            }
+          )
+        } else {
+          logger.debug({ fileHash }, 'created blob for content')
+          return callback(null, { file: fileHash })
+        }
+      }
+    )
   } else if (update.file != null && update.url != null) {
     // Rewrite the filestore url to point to the location in the local
     // settings for this service (this avoids problems with cross-
@@ -274,7 +313,13 @@ export function createBlobForUpdate(projectId, historyId, update, callback) {
           (fsPath, cb) => {
             _createBlob(historyId, fsPath, cb)
           },
-          callback
+          (err, fileHash) => {
+            if (err) {
+              return callback(err)
+            }
+            logger.debug({ fileHash }, 'created blob for file')
+            callback(null, { file: fileHash })
+          }
         )
       })
       .catch(err => {
@@ -291,7 +336,13 @@ export function createBlobForUpdate(projectId, historyId, update, callback) {
             (fsPath, cb) => {
               _createBlob(historyId, fsPath, cb)
             },
-            callback
+            (err, fileHash) => {
+              if (err) {
+                return callback(err)
+              }
+              logger.debug({ fileHash }, 'created empty blob for file')
+              callback(null, { file: fileHash })
+            }
           )
           emptyStream.push(null) // send an EOF signal
         } else {

services/project-history/app/js/SnapshotManager.js

@@ -185,6 +185,7 @@ async function getRangesSnapshot(projectId, version, pathname) {
           p: position,
           c: commentRangeContent,
           t: comment.id,
+          resolved: comment.resolved,
         },
       })
     }

services/project-history/app/js/UpdateTranslator.js

@@ -55,14 +55,16 @@ function _convertToChange(projectId, updateWithBlob) {
     ]
     projectVersion = update.version
   } else if (isAddUpdate(update)) {
-    operations = [
+    const op = {
-      {
       pathname: _convertPathname(update.pathname),
       file: {
-          hash: updateWithBlob.blobHash,
+        hash: updateWithBlob.blobHashes.file,
       },
-      },
+    }
-    ]
+    if (_isAddDocUpdate(update)) {
+      op.file.rangesHash = updateWithBlob.blobHashes.ranges
+    }
+    operations = [op]
     projectVersion = update.version
   } else if (isTextUpdate(update)) {
     const docLength = update.meta.history_doc_length ?? update.meta.doc_length

services/project-history/app/js/types.ts

@@ -1,3 +1,5 @@
+import { HistoryRanges } from '../../../document-updater/app/js/types'
+
 export type Update =
   | TextUpdate
   | AddDocUpdate
@@ -51,7 +53,8 @@ type ProjectUpdateBase = {
 
 export type AddDocUpdate = ProjectUpdateBase & {
   pathname: string
-  docLines: string[]
+  docLines: string
+  ranges?: HistoryRanges
 }
 
 export type AddFileUpdate = ProjectUpdateBase & {
@@ -134,7 +137,10 @@ export type CommentOp = {
 
 export type UpdateWithBlob = {
   update: Update
-  blobHash: string
+  blobHashes: {
+    file: string
+    ranges?: string
+  }
 }
 
 export type RawOrigin = {
@@ -173,6 +179,7 @@ export type CommentSnapshot = {
     p: number
     t: string
     c: string
+    resolved: boolean
   }
 }
 

services/project-history/test/acceptance/js/SendingUpdatesTests.js

@@ -30,10 +30,11 @@ function slTextUpdate(historyId, doc, userId, v, ts, op) {
   }
 }
 
-function slAddDocUpdate(historyId, doc, userId, ts, docLines) {
+function slAddDocUpdate(historyId, doc, userId, ts, docLines, ranges = {}) {
   return {
     projectHistoryId: historyId,
     pathname: doc.pathname,
+    ranges,
     docLines,
     doc: doc.id,
     meta: { user_id: userId, ts: ts.getTime() },
@@ -46,9 +47,10 @@ function slAddDocUpdateWithVersion(
   userId,
   ts,
   docLines,
-  projectVersion
+  projectVersion,
+  ranges = {}
 ) {
-  const result = slAddDocUpdate(historyId, doc, userId, ts, docLines)
+  const result = slAddDocUpdate(historyId, doc, userId, ts, docLines, ranges)
   result.version = projectVersion
   return result
 }
@@ -59,6 +61,7 @@ function slAddFileUpdate(historyId, file, userId, ts, projectId) {
     pathname: file.pathname,
     url: `http://127.0.0.1:3009/project/${projectId}/file/${file.id}`,
     file: file.id,
+    ranges: undefined,
     meta: { user_id: userId, ts: ts.getTime() },
   }
 }
@@ -132,8 +135,8 @@ function olRenameUpdate(doc, userId, ts, pathname, newPathname) {
   }
 }
 
-function olAddDocUpdate(doc, userId, ts, fileHash) {
+function olAddDocUpdate(doc, userId, ts, fileHash, rangesHash = undefined) {
-  return {
+  const update = {
     v2Authors: [userId],
     timestamp: ts.toJSON(),
     authors: [],
@@ -147,10 +150,21 @@ function olAddDocUpdate(doc, userId, ts, fileHash) {
       },
     ],
   }
+  if (rangesHash) {
+    update.operations[0].file.rangesHash = rangesHash
+  }
+  return update
 }
 
-function olAddDocUpdateWithVersion(doc, userId, ts, fileHash, version) {
+function olAddDocUpdateWithVersion(
-  const result = olAddDocUpdate(doc, userId, ts, fileHash)
+  doc,
+  userId,
+  ts,
+  fileHash,
+  version,
+  rangesHash = undefined
+) {
+  const result = olAddDocUpdate(doc, userId, ts, fileHash, rangesHash)
   result.projectVersion = version
   return result
 }
@@ -281,6 +295,115 @@ describe('Sending Updates', function () {
       )
     })
 
+    it('should send ranges to the history store', function (done) {
+      const fileHash = '49e886093b3eacbc12b99a1eb5aeaa44a6b9d90e'
+      const rangesHash = 'fa9a429ff518bc9e5b2507a96ff0646b566eca65'
+
+      const historyRanges = {
+        trackedChanges: [
+          {
+            range: { pos: 4, length: 3 },
+            tracking: {
+              type: 'delete',
+              userId: 'user-id-1',
+              ts: '2024-01-01T00:00:00.000Z',
+            },
+          },
+        ],
+        comments: [
+          {
+            ranges: [{ pos: 0, length: 3 }],
+            id: 'comment-id-1',
+          },
+        ],
+      }
+
+      // We need to set up the ranges mock first, as we will call it last..
+      const createRangesBlob = MockHistoryStore()
+        .put(`/api/projects/${historyId}/blobs/${rangesHash}`, historyRanges)
+        .reply(201)
+
+      const createBlob = MockHistoryStore()
+        .put(`/api/projects/${historyId}/blobs/${fileHash}`, 'foo barbaz')
+        .reply(201)
+
+      const addFile = MockHistoryStore()
+        .post(`/api/projects/${historyId}/legacy_changes`, body => {
+          expect(body).to.deep.equal([
+            olAddDocUpdate(
+              this.doc,
+              this.userId,
+              this.timestamp,
+              fileHash,
+              rangesHash
+            ),
+          ])
+          return true
+        })
+        .query({ end_version: 0 })
+        .reply(204)
+
+      async.series(
+        [
+          cb => {
+            ProjectHistoryClient.pushRawUpdate(
+              this.projectId,
+              slAddDocUpdate(
+                historyId,
+                this.doc,
+                this.userId,
+                this.timestamp,
+                'foo barbaz',
+                {
+                  changes: [
+                    {
+                      op: { p: 4, d: 'bar' },
+                      metadata: {
+                        ts: 1704067200000,
+                        user_id: 'user-id-1',
+                      },
+                    },
+                  ],
+                  comments: [
+                    {
+                      op: {
+                        p: 0,
+                        c: 'foo',
+                        t: 'comment-id-1',
+                      },
+                      metadata: { resolved: false },
+                    },
+                  ],
+                }
+              ),
+              cb
+            )
+          },
+          cb => {
+            ProjectHistoryClient.flushProject(this.projectId, cb)
+          },
+        ],
+        error => {
+          if (error) {
+            return done(error)
+          }
+          assert(
+            createBlob.isDone(),
+            '/api/projects/:historyId/blobs/:hash should have been called to create content blob'
+          )
+          assert(
+            createRangesBlob.isDone(),
+            '/api/projects/:historyId/blobs/:hash should have been called to create ranges blob'
+          )
+          assert(
+            addFile.isDone(),
+            `/api/projects/${historyId}/changes should have been called`
+          )
+          done()
+        }
+      )
+    })
+
     it('should strip non-BMP characters in add doc updates before sending to the history store', function (done) {
       const fileHash = '11509fe05a41f9cdc51ea081342b5a4fc7c8d0fc'
 

services/project-history/test/unit/js/BlobManager/BlobManagerTests.js

@@ -53,7 +53,9 @@ describe('BlobManager', function () {
       beforeEach(function (done) {
         this.UpdateTranslator.isAddUpdate.returns(true)
         this.blobHash = 'test hash'
-        this.HistoryStoreManager.createBlobForUpdate.yields(null, this.blobHash)
+        this.HistoryStoreManager.createBlobForUpdate.yields(null, {
+          file: this.blobHash,
+        })
         this.BlobManager.createBlobsForUpdates(
           this.project_id,
           this.historyId,
@@ -79,7 +81,7 @@ describe('BlobManager', function () {
       it('should call the callback with the updates', function () {
         const updatesWithBlobs = this.updates.map(update => ({
           update,
-          blobHash: this.blobHash,
+          blobHashes: { file: this.blobHash },
         }))
         this.callback.calledWith(null, updatesWithBlobs).should.equal(true)
       })
@@ -92,7 +94,9 @@ describe('BlobManager', function () {
         this.HistoryStoreManager.createBlobForUpdate
           .onFirstCall()
           .yields(new Error('random failure'))
-        this.HistoryStoreManager.createBlobForUpdate.yields(null, this.blobHash)
+        this.HistoryStoreManager.createBlobForUpdate.yields(null, {
+          file: this.blobHash,
+        })
         this.BlobManager.createBlobsForUpdates(
           this.project_id,
           this.historyId,
@@ -118,7 +122,7 @@ describe('BlobManager', function () {
       it('should call the callback with the updates', function () {
         const updatesWithBlobs = this.updates.map(update => ({
           update,
-          blobHash: this.blobHash,
+          blobHashes: { file: this.blobHash },
         }))
         this.callback.calledWith(null, updatesWithBlobs).should.equal(true)
       })

services/project-history/test/unit/js/HistoryBlobTranslator/HistoryBlobTranslatorTests.js

@@ -0,0 +1,476 @@
+import { expect } from 'chai'
+import { createRangeBlobDataFromUpdate } from '../../../../app/js/HistoryBlobTranslator.js'
+
+/** @typedef {import("../../../../app/js/types").AddDocUpdate} AddDocUpdate */
+
+/**
+ *
+ * @param {string} pathname s
+ * @param {string} docLines
+ * @param {AddDocUpdate["ranges"]} ranges
+ * @returns {AddDocUpdate}
+ */
+const update = (pathname, docLines, ranges) => {
+  return {
+    pathname,
+    docLines,
+    ranges,
+    version: 'version-1',
+    projectHistoryId: 'project-id',
+    doc: 'doc',
+    meta: {
+      user_id: 'user-id',
+      ts: 0,
+    },
+  }
+}
+
+describe('HistoryBlobTranslator', function () {
+  describe('createBlobDataFromUpdate', function () {
+    beforeEach(function () {
+      this.text = 'the quick brown fox jumps over the lazy dog'
+    })
+    describe('for update with no ranges', function () {
+      beforeEach(function () {
+        this.result = createRangeBlobDataFromUpdate(
+          update('pathname', this.text, undefined)
+        )
+      })
+
+      it('should not return ranges', function () {
+        expect(this.result).to.be.undefined
+      })
+    })
+
+    describe('for update with empty ranges object', function () {
+      beforeEach(function () {
+        this.result = createRangeBlobDataFromUpdate(
+          update('pathname', this.text, {})
+        )
+      })
+
+      it('should not return ranges', function () {
+        expect(this.result).to.be.undefined
+      })
+    })
+
+    describe('for update with ranges object with empty lists', function () {
+      beforeEach(function () {
+        this.result = createRangeBlobDataFromUpdate(
+          update('pathname', this.text, { changes: [], comments: [] })
+        )
+      })
+
+      it('should not return ranges', function () {
+        expect(this.result).to.be.undefined
+      })
+    })
+
+    describe('for update with ranges object with only comments', function () {
+      it('should return unmoved ranges', function () {
+        const result = createRangeBlobDataFromUpdate(
+          update('pathname', this.text, {
+            comments: [
+              {
+                op: { c: 'quick', p: 4, t: 'comment-1', resolved: false },
+              },
+            ],
+          })
+        )
+        expect(result).to.deep.equal({
+          comments: [
+            {
+              id: 'comment-1',
+              ranges: [{ pos: 4, length: 5 }],
+            },
+          ],
+          trackedChanges: [],
+        })
+      })
+
+      it('should merge comments ranges into a single comment by id', function () {
+        const result = createRangeBlobDataFromUpdate(
+          update('pathname', this.text, {
+            comments: [
+              {
+                op: { c: 'quick', p: 4, t: 'comment-1', resolved: false },
+              },
+              {
+                op: { c: 'jumps', p: 20, t: 'comment-1', resolved: false },
+              },
+            ],
+          })
+        )
+        expect(result).to.deep.equal({
+          comments: [
+            {
+              id: 'comment-1',
+              ranges: [
+                { pos: 4, length: 5 },
+                { pos: 20, length: 5 },
+              ],
+            },
+          ],
+          trackedChanges: [],
+        })
+      })
+
+      it('should not merge ranges into a single comment if id differs', function () {
+        const result = createRangeBlobDataFromUpdate(
+          update('pathname', this.text, {
+            comments: [
+              {
+                op: { c: 'quick', p: 4, t: 'comment-1', resolved: false },
+              },
+              {
+                op: { c: 'jumps', p: 20, t: 'comment-2', resolved: false },
+              },
+            ],
+          })
+        )
+        expect(result).to.deep.equal({
+          comments: [
+            {
+              id: 'comment-1',
+              ranges: [{ pos: 4, length: 5 }],
+            },
+            {
+              id: 'comment-2',
+              ranges: [{ pos: 20, length: 5 }],
+            },
+          ],
+          trackedChanges: [],
+        })
+      })
+    })
+
+    describe('for update with ranges object with only tracked insertions', function () {
+      it('should translate into history tracked insertions', function () {
+        const result = createRangeBlobDataFromUpdate(
+          update('pathname', this.text, {
+            changes: [
+              {
+                op: { p: 4, i: 'quick' },
+                metadata: {
+                  ts: '2024-01-01T00:00:00.000Z',
+                  user_id: 'user-1',
+                },
+              },
+              {
+                op: { p: 10, i: 'brown' },
+                metadata: {
+                  ts: '2023-01-01T00:00:00.000Z',
+                  user_id: 'user-2',
+                },
+              },
+            ],
+          })
+        )
+        expect(result).to.deep.equal({
+          comments: [],
+          trackedChanges: [
+            {
+              range: { pos: 4, length: 5 },
+              tracking: {
+                type: 'insert',
+                userId: 'user-1',
+                ts: '2024-01-01T00:00:00.000Z',
+              },
+            },
+            {
+              range: { pos: 10, length: 5 },
+              tracking: {
+                type: 'insert',
+                userId: 'user-2',
+                ts: '2023-01-01T00:00:00.000Z',
+              },
+            },
+          ],
+        })
+      })
+    })
+
+    describe('for update with ranges object with mixed tracked changes', function () {
+      describe('with tracked deletions before insertions', function () {
+        it('should insert tracked deletions before insertions', function () {
+          const text = 'the quickrapid brown fox jumps over the lazy dog'
+          const result = createRangeBlobDataFromUpdate(
+            update('pathname', text, {
+              changes: [
+                {
+                  op: { p: 4, d: 'quick' },
+                  metadata: {
+                    ts: '2024-01-01T00:00:00.000Z',
+                    user_id: 'user-1',
+                  },
+                },
+                {
+                  op: { p: 4, hpos: 9, i: 'rapid' },
+                  metadata: {
+                    ts: '2023-01-01T00:00:00.000Z',
+                    user_id: 'user-2',
+                  },
+                },
+              ],
+            })
+          )
+
+          expect(result).to.deep.equal({
+            comments: [],
+            trackedChanges: [
+              {
+                range: { pos: 4, length: 5 },
+                tracking: {
+                  type: 'delete',
+                  userId: 'user-1',
+                  ts: '2024-01-01T00:00:00.000Z',
+                },
+              },
+              {
+                range: { pos: 9, length: 5 },
+                tracking: {
+                  type: 'insert',
+                  userId: 'user-2',
+                  ts: '2023-01-01T00:00:00.000Z',
+                },
+              },
+            ],
+          })
+        })
+      })
+
+      describe('with tracked insertions before deletions', function () {
+        it('should insert tracked deletions before insertions', function () {
+          const text = 'the quickrapid brown fox jumps over the lazy dog'
+          const result = createRangeBlobDataFromUpdate(
+            update('pathname', text, {
+              changes: [
+                {
+                  op: { p: 4, hpos: 9, i: 'rapid' },
+                  metadata: {
+                    ts: '2023-01-01T00:00:00.000Z',
+                    user_id: 'user-2',
+                  },
+                },
+                {
+                  op: { p: 4, d: 'quick' },
+                  metadata: {
+                    ts: '2024-01-01T00:00:00.000Z',
+                    user_id: 'user-1',
+                  },
+                },
+              ],
+            })
+          )
+
+          expect(result).to.deep.equal({
+            comments: [],
+            trackedChanges: [
+              {
+                range: { pos: 4, length: 5 },
+                tracking: {
+                  type: 'delete',
+                  userId: 'user-1',
+                  ts: '2024-01-01T00:00:00.000Z',
+                },
+              },
+              {
+                range: { pos: 9, length: 5 },
+                tracking: {
+                  type: 'insert',
+                  userId: 'user-2',
+                  ts: '2023-01-01T00:00:00.000Z',
+                },
+              },
+            ],
+          })
+        })
+      })
+
+      it('should adjust positions', function () {
+        const text = 'the quick brown fox jumps over the lazy dog'
+        const result = createRangeBlobDataFromUpdate(
+          update('pathname', text, {
+            changes: [
+              {
+                op: { p: 4, i: 'quick' },
+                metadata: {
+                  ts: '2024-01-01T00:00:00.000Z',
+                  user_id: 'user-1',
+                },
+              },
+              {
+                op: { p: 10, d: 'brown' },
+                metadata: {
+                  ts: '2023-01-01T00:00:00.000Z',
+                  user_id: 'user-2',
+                },
+              },
+              {
+                op: { p: 30, hpos: 35, i: 'lazy' },
+                metadata: {
+                  ts: '2022-01-01T00:00:00.000Z',
+                  user_id: 'user-2',
+                },
+              },
+            ],
+          })
+        )
+        expect(result).to.deep.equal({
+          comments: [],
+          trackedChanges: [
+            {
+              range: { pos: 4, length: 5 },
+              tracking: {
+                type: 'insert',
+                userId: 'user-1',
+                ts: '2024-01-01T00:00:00.000Z',
+              },
+            },
+            {
+              range: { pos: 10, length: 5 },
+              tracking: {
+                type: 'delete',
+                userId: 'user-2',
+                ts: '2023-01-01T00:00:00.000Z',
+              },
+            },
+            {
+              range: { pos: 35, length: 4 },
+              tracking: {
+                type: 'insert',
+                userId: 'user-2',
+                ts: '2022-01-01T00:00:00.000Z',
+              },
+            },
+          ],
+        })
+      })
+    })
+
+    describe('for update with ranges object with mixed tracked changes and comments', function () {
+      it('should adjust positions', function () {
+        const text = 'the quick brown fox jumps over the lazy dog'
+        const result = createRangeBlobDataFromUpdate(
+          update('pathname', text, {
+            comments: [
+              {
+                op: { c: 'quick', p: 4, t: 'comment-1', resolved: false },
+              },
+              {
+                op: {
+                  c: 'fox',
+                  p: 11,
+                  hpos: 16,
+                  t: 'comment-2',
+                  resolved: false,
+                },
+              },
+            ],
+            changes: [
+              {
+                op: { p: 4, i: 'quick' },
+                metadata: {
+                  ts: '2024-01-01T00:00:00.000Z',
+                  user_id: 'user-1',
+                },
+              },
+              {
+                op: { p: 10, d: 'brown' },
+                metadata: {
+                  ts: '2023-01-01T00:00:00.000Z',
+                  user_id: 'user-2',
+                },
+              },
+              {
+                op: { p: 30, hpos: 35, i: 'lazy' },
+                metadata: {
+                  ts: '2022-01-01T00:00:00.000Z',
+                  user_id: 'user-2',
+                },
+              },
+            ],
+          })
+        )
+        expect(result).to.deep.equal({
+          comments: [
+            {
+              ranges: [{ pos: 4, length: 5 }],
+              id: 'comment-1',
+            },
+            {
+              ranges: [{ pos: 16, length: 3 }],
+              id: 'comment-2',
+            },
+          ],
+          trackedChanges: [
+            {
+              range: { pos: 4, length: 5 },
+              tracking: {
+                type: 'insert',
+                userId: 'user-1',
+                ts: '2024-01-01T00:00:00.000Z',
+              },
+            },
+            {
+              range: { pos: 10, length: 5 },
+              tracking: {
+                type: 'delete',
+                userId: 'user-2',
+                ts: '2023-01-01T00:00:00.000Z',
+              },
+            },
+            {
+              range: { pos: 35, length: 4 },
+              tracking: {
+                type: 'insert',
+                userId: 'user-2',
+                ts: '2022-01-01T00:00:00.000Z',
+              },
+            },
+          ],
+        })
+      })
+
+      it('should adjust comment length', function () {
+        const text = 'the quick brown fox jumps over the lazy dog'
+        const result = createRangeBlobDataFromUpdate(
+          update('pathname', text, {
+            comments: [
+              {
+                op: { c: 'quick fox', p: 4, t: 'comment-1', resolved: false },
+              },
+            ],
+            changes: [
+              {
+                op: { p: 10, d: 'brown ' },
+                metadata: {
+                  ts: '2023-01-01T00:00:00.000Z',
+                  user_id: 'user-2',
+                },
+              },
+            ],
+          })
+        )
+        expect(result).to.deep.equal({
+          comments: [
+            {
+              ranges: [{ pos: 4, length: 9 }],
+              id: 'comment-1',
+            },
+          ],
+          trackedChanges: [
+            {
+              range: { pos: 10, length: 6 },
+              tracking: {
+                type: 'delete',
+                userId: 'user-2',
+                ts: '2023-01-01T00:00:00.000Z',
+              },
+            },
+          ],
+        })
+      })
+    })
+  })
+})

services/project-history/test/unit/js/HistoryStoreManager/HistoryStoreManagerTests.js

@@ -390,7 +390,7 @@ describe('HistoryStoreManager', function () {
           this.projectId,
           this.historyId,
           this.update,
-          (err, hash) => {
+          (err, { file: hash }) => {
             if (err) {
               return done(err)
             }

services/project-history/test/unit/js/SnapshotManager/SnapshotManagerTests.js

@@ -780,6 +780,12 @@ Four five six\
         expect(this.data.comments[2].op.p).to.eq(20)
         expect(this.data.comments[2].op.c).to.eq('ov')
       })
+
+      it('should put resolved status in op', function () {
+        expect(this.data.comments[0].op.resolved).to.be.false
+        expect(this.data.comments[1].op.resolved).to.be.false
+        expect(this.data.comments[2].op.resolved).to.be.false
+      })
     })
 
     describe('with multiple tracked changes and comments', function () {
@@ -919,6 +925,7 @@ Four five six\
                 c: '',
                 p: 4,
                 t: 'comment-1',
+                resolved: false,
               },
             },
             {
@@ -926,6 +933,7 @@ Four five six\
                 c: 'brown',
                 p: 4,
                 t: 'comment-1',
+                resolved: false,
               },
             },
             {
@@ -933,6 +941,7 @@ Four five six\
                 c: '',
                 p: 29,
                 t: 'comment-1',
+                resolved: false,
               },
             },
             {
@@ -940,6 +949,7 @@ Four five six\
                 c: 'the',
                 p: 0,
                 t: 'comment-2',
+                resolved: true,
               },
             },
             {
@@ -947,6 +957,7 @@ Four five six\
                 c: 'the',
                 p: 25,
                 t: 'comment-2',
+                resolved: true,
               },
             },
           ],

services/project-history/test/unit/js/UpdateTranslator/UpdateTranslatorTests.js

@@ -34,7 +34,7 @@ describe('UpdateTranslator', function () {
               ts: this.timestamp,
             },
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 
@@ -72,7 +72,7 @@ describe('UpdateTranslator', function () {
               ts: this.timestamp,
             },
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 
@@ -180,7 +180,7 @@ describe('UpdateTranslator', function () {
               ts: this.timestamp,
             },
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
         {
           update: {
@@ -192,7 +192,7 @@ describe('UpdateTranslator', function () {
               ts: this.timestamp,
             },
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 
@@ -291,7 +291,7 @@ describe('UpdateTranslator', function () {
             },
             url: 'filestore.example.com/test*test.png',
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 
@@ -329,7 +329,7 @@ describe('UpdateTranslator', function () {
             },
             url: 'filestore.example.com/test.png',
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 
@@ -367,7 +367,7 @@ describe('UpdateTranslator', function () {
             },
             url: 'filestore.example.com/folder/test.png',
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 
@@ -405,7 +405,7 @@ describe('UpdateTranslator', function () {
               ts: this.timestamp,
             },
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 
@@ -442,7 +442,7 @@ describe('UpdateTranslator', function () {
               ts: this.timestamp,
             },
           },
-          blobHash: this.mockBlobHash,
+          blobHashes: { file: this.mockBlobHash },
         },
       ]
 

services/web/app/src/Features/DocumentUpdater/DocumentUpdaterHandler.js

@@ -7,6 +7,7 @@ const logger = require('@overleaf/logger')
 const metrics = require('@overleaf/metrics')
 const { promisify } = require('util')
 const { promisifyMultiResult } = require('@overleaf/promise-utils')
+const ProjectGetter = require('../Project/ProjectGetter')
 
 module.exports = {
   flushProjectToMongo,
@@ -296,16 +297,38 @@ function updateProjectStructure(
     return callback()
   }
 
+  ProjectGetter.getProjectWithoutLock(
+    projectId,
+    { overleaf: true },
+    (err, project) => {
+      if (err) {
+        return callback(err)
+      }
+      const historyRangesSupport = _.get(
+        project,
+        'overleaf.history.rangesSupportEnabled',
+        false
+      )
       const {
         deletes: docDeletes,
         adds: docAdds,
         renames: docRenames,
-  } = _getUpdates('doc', changes.oldDocs, changes.newDocs)
+      } = _getUpdates(
+        'doc',
+        changes.oldDocs,
+        changes.newDocs,
+        historyRangesSupport
+      )
       const {
         deletes: fileDeletes,
         adds: fileAdds,
         renames: fileRenames,
-  } = _getUpdates('file', changes.oldFiles, changes.newFiles)
+      } = _getUpdates(
+        'file',
+        changes.oldFiles,
+        changes.newFiles,
+        historyRangesSupport
+      )
       const updates = [].concat(
         docDeletes,
         fileDeletes,
@@ -346,6 +369,8 @@ function updateProjectStructure(
         callback
       )
     }
+  )
+}
 
 function _makeRequest(options, projectId, metricsKey, callback) {
   const timer = new metrics.Timer(metricsKey)
@@ -380,7 +405,12 @@ function _makeRequest(options, projectId, metricsKey, callback) {
   )
 }
 
-function _getUpdates(entityType, oldEntities, newEntities) {
+function _getUpdates(
+  entityType,
+  oldEntities,
+  newEntities,
+  historyRangesSupport
+) {
   if (!oldEntities) {
     oldEntities = []
   }
@@ -431,6 +461,8 @@ function _getUpdates(entityType, oldEntities, newEntities) {
         id,
         pathname: newEntity.path,
         docLines: newEntity.docLines,
+        ranges: newEntity.ranges,
+        historyRangesSupport,
         url: newEntity.url,
         hash: newEntity.file != null ? newEntity.file.hash : undefined,
       })

services/web/app/src/Features/History/HistoryController.js

@@ -100,6 +100,27 @@ module.exports = HistoryController = {
     )
   },
 
+  revertFile(req, res, next) {
+    const { project_id: projectId } = req.params
+    const { version, pathname } = req.body
+    const userId = SessionManager.getLoggedInUserId(req.session)
+    RestoreManager.revertFile(
+      userId,
+      projectId,
+      version,
+      pathname,
+      function (err, entity) {
+        if (err) {
+          return next(err)
+        }
+        res.json({
+          type: entity.type,
+          id: entity._id,
+        })
+      }
+    )
+  },
+
   getLabels(req, res, next) {
     const projectId = req.params.Project_id
     HistoryController._makeRequest(

services/web/app/src/Features/History/RestoreManager.js

@@ -6,6 +6,8 @@ const EditorController = require('../Editor/EditorController')
 const Errors = require('../Errors/Errors')
 const moment = require('moment')
 const { callbackifyAll } = require('@overleaf/promise-utils')
+const { fetchJson } = require('@overleaf/fetch-utils')
+const ProjectLocator = require('../Project/ProjectLocator')
 
 const RestoreManager = {
   async restoreFileFromV2(userId, projectId, version, pathname) {
@@ -39,6 +41,62 @@ const RestoreManager = {
     )
   },
 
+  async revertFile(userId, projectId, version, pathname) {
+    const fsPath = await RestoreManager._writeFileVersionToDisk(
+      projectId,
+      version,
+      pathname
+    )
+    const basename = Path.basename(pathname)
+    let dirname = Path.dirname(pathname)
+    if (dirname === '.') {
+      // no directory
+      dirname = ''
+    }
+    const parentFolderId = await RestoreManager._findOrCreateFolder(
+      projectId,
+      dirname
+    )
+    let fileExists = true
+    try {
+      // TODO: Is there a better way of doing this?
+      await ProjectLocator.promises.findElementByPath({
+        projectId,
+        path: pathname,
+      })
+    } catch (error) {
+      fileExists = false
+    }
+    if (fileExists) {
+      throw new Errors.InvalidError('File already exists')
+    }
+
+    const importInfo = await FileSystemImportManager.promises.importFile(
+      fsPath,
+      pathname
+    )
+    if (importInfo.type !== 'doc') {
+      // TODO: Handle binary files
+      throw new Errors.InvalidError('File is not editable')
+    }
+
+    const ranges = await RestoreManager._getRangesFromHistory(
+      projectId,
+      version,
+      pathname
+    )
+
+    return await EditorController.promises.addDocWithRanges(
+      projectId,
+      parentFolderId,
+      basename,
+      importInfo.lines,
+      ranges,
+      'revert',
+      userId
+    )
+  },
+
   async _findOrCreateFolder(projectId, dirname) {
     const { lastFolder } = await EditorController.promises.mkdirp(
       projectId,
@@ -74,6 +132,13 @@ const RestoreManager = {
     }/project/${projectId}/version/${version}/${encodeURIComponent(pathname)}`
     return await FileWriter.promises.writeUrlToDisk(projectId, url)
   },
+
+  async _getRangesFromHistory(projectId, version, pathname) {
+    const url = `${
+      Settings.apis.project_history.url
+    }/project/${projectId}/ranges/version/${version}/${encodeURIComponent(pathname)}`
+    return await fetchJson(url)
+  },
 }
 
 module.exports = { ...callbackifyAll(RestoreManager), promises: RestoreManager }

services/web/app/src/Features/Project/ProjectEntityUpdateHandler.js

@@ -397,6 +397,7 @@ const ProjectEntityUpdateHandler = {
               doc,
               path: docPath,
               docLines: docLines.join('\n'),
+              ranges,
             },
           ]
           DocumentUpdaterHandler.updateProjectStructure(

services/web/app/src/Features/Uploads/FileSystemImportManager.js

@@ -10,9 +10,11 @@ const logger = require('@overleaf/logger')
 module.exports = {
   addEntity: callbackify(addEntity),
   importDir: callbackify(importDir),
+  importFile: callbackify(importDir),
   promises: {
     addEntity,
     importDir,
+    importFile,
   },
 }
 

services/web/app/src/router.js

@@ -769,6 +769,11 @@ function initialize(webRouter, privateApiRouter, publicApiRouter) {
     AuthorizationMiddleware.ensureUserCanWriteProjectContent,
     HistoryController.restoreFileFromV2
   )
+  webRouter.post(
+    '/project/:project_id/revert_file',
+    AuthorizationMiddleware.ensureUserCanWriteProjectContent,
+    HistoryController.revertFile
+  )
   webRouter.get(
     '/project/:project_id/version/:version/zip',
     RateLimiterMiddleware.rateLimit(rateLimiters.downloadProjectRevision),

services/web/test/unit/src/DocumentUpdater/DocumentUpdaterHandlerTests.js

@@ -44,6 +44,9 @@ describe('DocumentUpdaterHandler', function () {
         '../../models/Project': {
           Project: (this.Project = {}),
         },
+        '../Project/ProjectGetter': (this.ProjectGetter = {
+          getProjectWithoutLock: sinon.stub(),
+        }),
         '../../Features/Project/ProjectLocator': {},
         '@overleaf/metrics': {
           Timer: class {
@@ -52,6 +55,9 @@ describe('DocumentUpdaterHandler', function () {
         },
       },
     })
+    this.ProjectGetter.getProjectWithoutLock
+      .withArgs(this.project_id)
+      .yields(null, this.project)
   })
 
   describe('flushProjectToMongo', function () {
@@ -1116,8 +1122,10 @@ describe('DocumentUpdaterHandler', function () {
               id: this.docId.toString(),
               pathname: '/foo',
               docLines: 'a\nb',
+              historyRangesSupport: false,
               url: undefined,
               hash: undefined,
+              ranges: undefined,
             },
           ]
 
@@ -1169,7 +1177,9 @@ describe('DocumentUpdaterHandler', function () {
               pathname: '/bar',
               url: 'filestore.example.com/file',
               docLines: undefined,
+              historyRangesSupport: false,
               hash: '12345',
+              ranges: undefined,
             },
           ]
 
@@ -1280,8 +1290,10 @@ describe('DocumentUpdaterHandler', function () {
               id: this.docId.toString(),
               pathname: '/foo.doc',
               docLines: 'hello there',
+              historyRangesSupport: false,
               url: undefined,
               hash: undefined,
+              ranges: undefined,
             },
           ]
 
@@ -1337,6 +1349,128 @@ describe('DocumentUpdaterHandler', function () {
           )
         })
       })
+
+      describe('when ranges are present', function () {
+        beforeEach(function () {
+          this.docId = new ObjectId()
+          this.ranges = {
+            changes: [
+              {
+                op: { p: 0, i: 'foo' },
+                metadata: { ts: '2024-01-01T00:00:00.000Z', user_id: 'user-1' },
+              },
+              {
+                op: { p: 7, d: ' baz' },
+                metadata: { ts: '2024-02-01T00:00:00.000Z', user_id: 'user-1' },
+              },
+            ],
+            comments: [
+              {
+                op: { p: 4, c: 'bar', t: 'comment-1' },
+                metadata: { resolved: false },
+              },
+            ],
+          }
+          this.changes = {
+            newDocs: [
+              {
+                path: '/foo',
+                docLines: 'foo\nbar',
+                doc: { _id: this.docId },
+                ranges: this.ranges,
+              },
+            ],
+            newProject: { version: this.version },
+          }
+        })
+
+        it('should forward ranges', function (done) {
+          const updates = [
+            {
+              type: 'add-doc',
+              id: this.docId.toString(),
+              pathname: '/foo',
+              docLines: 'foo\nbar',
+              historyRangesSupport: false,
+              url: undefined,
+              hash: undefined,
+              ranges: this.ranges,
+            },
+          ]
+
+          this.handler.updateProjectStructure(
+            this.project_id,
+            this.projectHistoryId,
+            this.user_id,
+            this.changes,
+            this.source,
+            () => {
+              this.request
+                .calledWith({
+                  url: this.url,
+                  method: 'POST',
+                  json: {
+                    updates,
+                    userId: this.user_id,
+                    version: this.version,
+                    projectHistoryId: this.projectHistoryId,
+                    source: this.source,
+                  },
+                  timeout: 30 * 1000,
+                })
+                .should.equal(true)
+              done()
+            }
+          )
+        })
+
+        it('should include flag when history ranges support is enabled', function (done) {
+          this.ProjectGetter.getProjectWithoutLock
+            .withArgs(this.project_id)
+            .yields(null, {
+              _id: this.project_id,
+              overleaf: { history: { rangesSupportEnabled: true } },
+            })
+
+          const updates = [
+            {
+              type: 'add-doc',
+              id: this.docId.toString(),
+              pathname: '/foo',
+              docLines: 'foo\nbar',
+              historyRangesSupport: true,
+              url: undefined,
+              hash: undefined,
+              ranges: this.ranges,
+            },
+          ]
+
+          this.handler.updateProjectStructure(
+            this.project_id,
+            this.projectHistoryId,
+            this.user_id,
+            this.changes,
+            this.source,
+            () => {
+              this.request
+                .calledWith({
+                  url: this.url,
+                  method: 'POST',
+                  json: {
+                    updates,
+                    userId: this.user_id,
+                    version: this.version,
+                    projectHistoryId: this.projectHistoryId,
+                    source: this.source,
+                  },
+                  timeout: 30 * 1000,
+                })
+                .should.equal(true)
+              done()
+            }
+          )
+        })
+      })
     })
   })
 })

services/web/test/unit/src/History/RestoreManagerTests.js

@@ -22,6 +22,7 @@ describe('RestoreManager', function () {
         '../Editor/EditorController': (this.EditorController = {
           promises: {},
         }),
+        '../Project/ProjectLocator': (this.ProjectLocator = { promises: {} }),
       },
     })
     this.user_id = 'mock-user-id'
@@ -196,4 +197,119 @@ describe('RestoreManager', function () {
       })
     })
   })
+
+  describe('revertFile', function () {
+    beforeEach(function () {
+      this.RestoreManager.promises._writeFileVersionToDisk = sinon
+        .stub()
+        .resolves((this.fsPath = '/tmp/path/on/disk'))
+      this.RestoreManager.promises._findOrCreateFolder = sinon
+        .stub()
+        .resolves((this.folder_id = 'mock-folder-id'))
+      this.FileSystemImportManager.promises.addEntity = sinon
+        .stub()
+        .resolves((this.entity = 'mock-entity'))
+      this.RestoreManager.promises._getRangesFromHistory = sinon
+        .stub()
+        .rejects()
+    })
+
+    describe('with an existing file in the current project', function () {
+      beforeEach(function () {
+        this.pathname = 'foo.tex'
+        this.ProjectLocator.promises.findElementByPath = sinon.stub().resolves()
+      })
+
+      it('should reject', function () {
+        expect(
+          this.RestoreManager.promises.revertFile(
+            this.user_id,
+            this.project_id,
+            this.version,
+            this.pathname
+          )
+        )
+          .to.eventually.be.rejectedWith('File already exists')
+          .and.be.instanceOf(Errors.InvalidError)
+      })
+    })
+
+    describe('when reverting a binary file', function () {
+      beforeEach(function () {
+        this.pathname = 'foo.png'
+        this.FileSystemImportManager.promises.importFile = sinon
+          .stub()
+          .resolves({ type: 'binary' })
+      })
+      it('should reject', function () {
+        expect(
+          this.RestoreManager.promises.revertFile(
+            this.user_id,
+            this.project_id,
+            this.version,
+            this.pathname
+          )
+        )
+          .to.eventually.be.rejectedWith('File is not editable')
+          .and.be.instanceOf(Errors.InvalidError)
+      })
+    })
+
+    describe("when reverting a file that doesn't current exist", function () {
+      beforeEach(async function () {
+        this.pathname = 'foo.tex'
+        this.ProjectLocator.promises.findElementByPath = sinon.stub().rejects()
+        this.tracked_changes = [
+          {
+            op: { pos: 4, i: 'bar' },
+            metadata: { ts: '2024-01-01T00:00:00.000Z', user_id: 'user-1' },
+          },
+          {
+            op: { pos: 8, d: 'qux' },
+            metadata: { ts: '2024-01-01T00:00:00.000Z', user_id: 'user-2' },
+          },
+        ]
+        this.comments = [{ op: { t: 'comment-1', p: 0, c: 'foo' } }]
+        this.FileSystemImportManager.promises.importFile = sinon
+          .stub()
+          .resolves({ type: 'doc', lines: ['foo', 'bar', 'baz'] })
+        this.RestoreManager.promises._getRangesFromHistory = sinon
+          .stub()
+          .resolves({ changes: this.tracked_changes, comment: this.comments })
+        this.EditorController.promises.addDocWithRanges = sinon
+          .stub()
+          .resolves(
+            (this.addedFile = { doc: 'mock-doc', folderId: 'mock-folder' })
+          )
+        this.data = await this.RestoreManager.promises.revertFile(
+          this.user_id,
+          this.project_id,
+          this.version,
+          this.pathname
+        )
+      })
+
+      it('should import the file', function () {
+        expect(
+          this.EditorController.promises.addDocWithRanges
+        ).to.have.been.calledWith(
+          this.project_id,
+          this.folder_id,
+          'foo.tex',
+          ['foo', 'bar', 'baz'],
+          { changes: this.tracked_changes, comment: this.comments }
+        )
+      })
+
+      it('should return the created entity', function () {
+        expect(this.data).to.equal(this.addedFile)
+      })
+
+      it('should look up ranges', function () {
+        expect(
+          this.RestoreManager.promises._getRangesFromHistory
+        ).to.have.been.calledWith(this.project_id, this.version, this.pathname)
+      })
+    })
+  })
 })

services/web/test/unit/src/Project/ProjectEntityUpdateHandlerTests.js

@@ -554,6 +554,7 @@ describe('ProjectEntityUpdateHandler', function () {
             doc: this.newDoc,
             path: this.path,
             docLines: this.docLines.join('\n'),
+            ranges: {},
           },
         ]
         this.DocumentUpdaterHandler.updateProjectStructure.should.have.been.calledWith(