server/lib/activitypub/process/process-undo.ts

   1 import { ActivityFollow, ActivityLike, ActivityUndo } from '../../../../shared/models/activitypub'
   2 import { DislikeObject } from '../../../../shared/models/activitypub/objects'
   3 import { retryTransactionWrapper } from '../../../helpers/database-utils'
   4 import { logger } from '../../../helpers/logger'
   5 import { sequelizeTypescript } from '../../../initializers'
   6 import { AccountModel } from '../../../models/account/account'
   7 import { AccountVideoRateModel } from '../../../models/account/account-video-rate'
   8 import { ActorModel } from '../../../models/activitypub/actor'
   9 import { ActorFollowModel } from '../../../models/activitypub/actor-follow'
  10 import { VideoModel } from '../../../models/video/video'
  11 import { forwardActivity } from '../send/misc'
  12
  13 async function processUndoActivity (activity: ActivityUndo) {
  14   const activityToUndo = activity.object
  15
  16   if (activityToUndo.type === 'Like') {
  17     return processUndoLike(activity.actor, activity)
  18   } else if (activityToUndo.type === 'Create' && activityToUndo.object.type === 'Dislike') {
  19     return processUndoDislike(activity.actor, activity)
  20   } else if (activityToUndo.type === 'Follow') {
  21     return processUndoFollow(activity.actor, activityToUndo)
  22   }
  23
  24   logger.warn('Unknown activity object type %s -> %s when undo activity.', activityToUndo.type, { activity: activity.id })
  25
  26   return undefined
  27 }
  28
  29 // ---------------------------------------------------------------------------
  30
  31 export {
  32   processUndoActivity
  33 }
  34
  35 // ---------------------------------------------------------------------------
  36
  37 function processUndoLike (actorUrl: string, activity: ActivityUndo) {
  38   const options = {
  39     arguments: [ actorUrl, activity ],
  40     errorMessage: 'Cannot undo like with many retries.'
  41   }
  42
  43   return retryTransactionWrapper(undoLike, options)
  44 }
  45
  46 function undoLike (actorUrl: string, activity: ActivityUndo) {
  47   const likeActivity = activity.object as ActivityLike
  48
  49   return sequelizeTypescript.transaction(async t => {
  50     const byAccount = await AccountModel.loadByUrl(actorUrl, t)
  51     if (!byAccount) throw new Error('Unknown account ' + actorUrl)
  52
  53     const video = await VideoModel.loadByUrlAndPopulateAccount(likeActivity.object, t)
  54     if (!video) throw new Error('Unknown video ' + likeActivity.actor)
  55
  56     const rate = await AccountVideoRateModel.load(byAccount.id, video.id, t)
  57     if (!rate) throw new Error(`Unknown rate by account ${byAccount.id} for video ${video.id}.`)
  58
  59     await rate.destroy({ transaction: t })
  60     await video.decrement('likes', { transaction: t })
  61
  62     if (video.isOwned()) {
  63       // Don't resend the activity to the sender
  64       const exceptions = [ byAccount.Actor ]
  65       await forwardActivity(activity, t, exceptions)
  66     }
  67   })
  68 }
  69
  70 function processUndoDislike (actorUrl: string, activity: ActivityUndo) {
  71   const options = {
  72     arguments: [ actorUrl, activity ],
  73     errorMessage: 'Cannot undo dislike with many retries.'
  74   }
  75
  76   return retryTransactionWrapper(undoDislike, options)
  77 }
  78
  79 function undoDislike (actorUrl: string, activity: ActivityUndo) {
  80   const dislike = activity.object.object as DislikeObject
  81
  82   return sequelizeTypescript.transaction(async t => {
  83     const byAccount = await AccountModel.loadByUrl(actorUrl, t)
  84     if (!byAccount) throw new Error('Unknown account ' + actorUrl)
  85
  86     const video = await VideoModel.loadByUrlAndPopulateAccount(dislike.object, t)
  87     if (!video) throw new Error('Unknown video ' + dislike.actor)
  88
  89     const rate = await AccountVideoRateModel.load(byAccount.id, video.id, t)
  90     if (!rate) throw new Error(`Unknown rate by account ${byAccount.id} for video ${video.id}.`)
  91
  92     await rate.destroy({ transaction: t })
  93     await video.decrement('dislikes', { transaction: t })
  94
  95     if (video.isOwned()) {
  96       // Don't resend the activity to the sender
  97       const exceptions = [ byAccount.Actor ]
  98       await forwardActivity(activity, t, exceptions)
  99     }
 100   })
 101 }
 102
 103 function processUndoFollow (actorUrl: string, followActivity: ActivityFollow) {
 104   const options = {
 105     arguments: [ actorUrl, followActivity ],
 106     errorMessage: 'Cannot undo follow with many retries.'
 107   }
 108
 109   return retryTransactionWrapper(undoFollow, options)
 110 }
 111
 112 function undoFollow (actorUrl: string, followActivity: ActivityFollow) {
 113   return sequelizeTypescript.transaction(async t => {
 114     const follower = await ActorModel.loadByUrl(actorUrl, t)
 115     const following = await ActorModel.loadByUrl(followActivity.object, t)
 116     const actorFollow = await ActorFollowModel.loadByActorAndTarget(follower.id, following.id, t)
 117
 118     if (!actorFollow) throw new Error(`'Unknown actor follow ${follower.id} -> ${following.id}.`)
 119
 120     await actorFollow.destroy({ transaction: t })
 121
 122     return undefined
 123   })
 124 }