1 files changed, 88 insertions, 11 deletions

diff --git a/server/lib/activitypub/process/process-undo.ts b/server/lib/activitypub/process/process-undo.ts
index 610b800fb..caa835714 100644
--- a/server/lib/activitypub/process/process-undo.ts
+++ b/server/lib/activitypub/process/process-undo.ts
@@ -1,20 +1,20 @@
-import { ActivityUndo } from '../../../../shared/models/activitypub/activity'
+import { ActivityCreate, ActivityFollow, ActivityLike, ActivityUndo } from '../../../../shared/models/activitypub/activity'
 import { logger } from '../../../helpers/logger'
 import { database as db } from '../../../initializers'
+import { retryTransactionWrapper } from '../../../helpers/database-utils'
+import { DislikeObject } from '../../../../shared/models/activitypub/objects/dislike-object'
+import { sendUndoLikeToVideoFollowers } from '../send/send-undo'
+import { sendUndoDislikeToVideoFollowers } from '../index'
 
 async function processUndoActivity (activity: ActivityUndo) {
   const activityToUndo = activity.object
 
-  if (activityToUndo.type === 'Follow') {
-    const follower = await db.Account.loadByUrl(activity.actor)
-    const following = await db.Account.loadByUrl(activityToUndo.object)
-    const accountFollow = await db.AccountFollow.loadByAccountAndTarget(follower.id, following.id)
-
-    if (!accountFollow) throw new Error(`'Unknown account follow ${follower.id} -> ${following.id}.`)
-
-    await accountFollow.destroy()
-
-    return undefined
+  if (activityToUndo.type === 'Like') {
+    return processUndoLike(activity.actor, activityToUndo)
+  } else if (activityToUndo.type === 'Create' && activityToUndo.object.type === 'Dislike') {
+    return processUndoDislike(activity.actor, activityToUndo.object)
+  } else if (activityToUndo.type === 'Follow') {
+    return processUndoFollow(activity.actor, activityToUndo)
   }
 
   logger.warn('Unknown activity object type %s -> %s when undo activity.', activityToUndo.type, { activity: activity.id })
@@ -29,3 +29,80 @@ export {
 }
 
 // ---------------------------------------------------------------------------
+
+function processUndoLike (actor: string, likeActivity: ActivityLike) {
+  const options = {
+    arguments: [ actor, likeActivity ],
+    errorMessage: 'Cannot undo like with many retries.'
+  }
+
+  return retryTransactionWrapper(undoLike, options)
+}
+
+function undoLike (actor: string, likeActivity: ActivityLike) {
+  return db.sequelize.transaction(async t => {
+    const byAccount = await db.Account.loadByUrl(actor, t)
+    if (!byAccount) throw new Error('Unknown account ' + actor)
+
+    const video = await db.Video.loadByUrlAndPopulateAccount(likeActivity.object)
+    if (!video) throw new Error('Unknown video ' + likeActivity.actor)
+
+    const rate = await db.AccountVideoRate.load(byAccount.id, video.id, t)
+    if (!rate) throw new Error(`Unknown rate by account ${byAccount.id} for video ${video.id}.`)
+
+    await rate.destroy({ transaction: t })
+    await video.decrement('likes')
+
+    if (video.isOwned()) await sendUndoLikeToVideoFollowers(byAccount, video, t)
+  })
+}
+
+function processUndoDislike (actor: string, dislikeCreateActivity: DislikeObject) {
+  const options = {
+    arguments: [ actor, dislikeCreateActivity ],
+    errorMessage: 'Cannot undo dislike with many retries.'
+  }
+
+  return retryTransactionWrapper(undoDislike, options)
+}
+
+function undoDislike (actor: string, dislike: DislikeObject) {
+  return db.sequelize.transaction(async t => {
+    const byAccount = await db.Account.loadByUrl(actor, t)
+    if (!byAccount) throw new Error('Unknown account ' + actor)
+
+    const video = await db.Video.loadByUrlAndPopulateAccount(dislike.object)
+    if (!video) throw new Error('Unknown video ' + dislike.actor)
+
+    const rate = await db.AccountVideoRate.load(byAccount.id, video.id, t)
+    if (!rate) throw new Error(`Unknown rate by account ${byAccount.id} for video ${video.id}.`)
+
+    await rate.destroy({ transaction: t })
+    await video.decrement('dislikes')
+
+    if (video.isOwned()) await sendUndoDislikeToVideoFollowers(byAccount, video, t)
+  })
+}
+
+function processUndoFollow (actor: string, followActivity: ActivityFollow) {
+  const options = {
+    arguments: [ actor, followActivity ],
+    errorMessage: 'Cannot undo follow with many retries.'
+  }
+
+  return retryTransactionWrapper(undoFollow, options)
+}
+
+function undoFollow (actor: string, followActivity: ActivityFollow) {
+  return db.sequelize.transaction(async t => {
+    const follower = await db.Account.loadByUrl(actor, t)
+    const following = await db.Account.loadByUrl(followActivity.object, t)
+    const accountFollow = await db.AccountFollow.loadByAccountAndTarget(follower.id, following.id, t)
+
+    if (!accountFollow) throw new Error(`'Unknown account follow ${follower.id} -> ${following.id}.`)
+
+    await accountFollow.destroy({ transaction: t })
+
+    return undefined
+  })
+}