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