[history-ot] initial implementation of using doc-level history-ot (#25054)

* [history-v1-ot] initial implementation of using doc-level history-v1-ot

* [web] fix advancing of the otMigrationStage

Use 'nextStage' for the user provided, desired stage when advancing.

Co-authored-by: Brian Gough <brian.gough@overleaf.com>

* [document-updater] document size check in editor-core

* [history-ot] rename history-v1-ot to history-ot and add types

* [history-ot] apply review feedback

- remove extra !!
- merge variable assignment when processing diff-match-match output
- add helper function for getting docstore lines view of StringFileData

Co-authored-by: Alf Eaton <alf.eaton@overleaf.com>

* Revert "[document-updater] add safe rollback point for history-ot (#25283)"

This reverts commit d7230dd14a379a27d2c6ab03a006463a18979d06

Signed-off-by: Jakob Ackermann <jakob.ackermann@overleaf.com>

---------

Signed-off-by: Jakob Ackermann <jakob.ackermann@overleaf.com>
Co-authored-by: Brian Gough <brian.gough@overleaf.com>
Co-authored-by: Alf Eaton <alf.eaton@overleaf.com>
GitOrigin-RevId: 89c497782adb0427635d50d02263d6f535b12481

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

@@ -2,6 +2,8 @@ const { Project } = require('../../models/Project')
 const settings = require('@overleaf/settings')
 const { callbackify } = require('util')
 const { db, ObjectId } = require('../../infrastructure/mongodb')
+const Errors = require('../Errors/Errors')
+const { ReturnDocument } = require('mongodb-legacy')
 const safeCompilers = ['xelatex', 'pdflatex', 'latex', 'lualatex']
 
 const ProjectOptionsHandler = {
@@ -73,6 +75,21 @@ const ProjectOptionsHandler = {
     // because rangesSupportEnabled is not part of the schema?
     return db.projects.updateOne(conditions, update)
   },
+
+  async setOTMigrationStage(projectId, nextStage) {
+    const project = await db.projects.findOneAndUpdate(
+      { _id: new ObjectId(projectId) },
+      // Use $max to ensure that we never downgrade the migration stage.
+      { $max: { 'overleaf.history.otMigrationStage': nextStage } },
+      {
+        returnDocument: ReturnDocument.AFTER,
+        projection: { 'overleaf.history.otMigrationStage': 1 },
+      }
+    )
+    if (!project) throw new Errors.NotFoundError('project does not exist')
+    const { otMigrationStage } = project.overleaf.history
+    return { otMigrationStage }
+  },
 }
 
 module.exports = {