Federate likes/dislikes

12 files changed, 438 insertions, 34 deletions

diff --git a/server/lib/activitypub/process/index.ts b/server/lib/activitypub/process/index.ts
index c68312053..e25c261cc 100644
--- a/server/lib/activitypub/process/index.ts
+++ b/server/lib/activitypub/process/index.ts
@@ -5,5 +5,6 @@ export * from './process-announce'
 export * from './process-create'
 export * from './process-delete'
 export * from './process-follow'
+export * from './process-like'
 export * from './process-undo'
 export * from './process-update'
diff --git a/server/lib/activitypub/process/process-create.ts b/server/lib/activitypub/process/process-create.ts
index 1777733a0..147bbd132 100644
--- a/server/lib/activitypub/process/process-create.ts
+++ b/server/lib/activitypub/process/process-create.ts
@@ -5,9 +5,10 @@ import { logger, retryTransactionWrapper } from '../../../helpers'
 import { database as db } from '../../../initializers'
 import { AccountInstance } from '../../../models/account/account-interface'
 import { getOrCreateAccountAndServer } from '../account'
-import { sendCreateViewToVideoFollowers } from '../send/send-create'
+import { sendCreateDislikeToVideoFollowers, sendCreateViewToVideoFollowers } from '../send/send-create'
 import { getVideoChannelActivityPubUrl } from '../url'
 import { videoChannelActivityObjectToDBAttributes } from './misc'
+import { DislikeObject } from '../../../../shared/models/activitypub/objects/dislike-object'
 
 async function processCreateActivity (activity: ActivityCreate) {
   const activityObject = activity.object
@@ -16,6 +17,8 @@ async function processCreateActivity (activity: ActivityCreate) {
 
   if (activityType === 'View') {
     return processCreateView(activityObject as ViewObject)
+  } else if (activityType === 'Dislike') {
+    return processCreateDislike(account, activityObject as DislikeObject)
   } else if (activityType === 'VideoChannel') {
     return processCreateVideoChannel(account, activityObject as VideoChannelObject)
   } else if (activityType === 'Flag') {
@@ -34,6 +37,36 @@ export {
 
 // ---------------------------------------------------------------------------
 
+async function processCreateDislike (byAccount: AccountInstance, dislike: DislikeObject) {
+  const options = {
+    arguments: [ byAccount, dislike ],
+    errorMessage: 'Cannot dislike the video with many retries.'
+  }
+
+  return retryTransactionWrapper(createVideoDislike, options)
+}
+
+function createVideoDislike (byAccount: AccountInstance, dislike: DislikeObject) {
+  return db.sequelize.transaction(async t => {
+    const video = await db.Video.loadByUrlAndPopulateAccount(dislike.object)
+
+    if (!video) throw new Error('Unknown video ' + dislike.object)
+
+    const rate = {
+      type: 'dislike' as 'dislike',
+      videoId: video.id,
+      accountId: byAccount.id
+    }
+    const [ , created ] = await db.AccountVideoRate.findOrCreate({
+      where: rate,
+      defaults: rate
+    })
+    await video.increment('dislikes')
+
+    if (video.isOwned() && created === true) await sendCreateDislikeToVideoFollowers(byAccount, video, undefined)
+  })
+}
+
 async function processCreateView (view: ViewObject) {
   const video = await db.Video.loadByUrlAndPopulateAccount(view.object)
 
diff --git a/server/lib/activitypub/process/process-like.ts b/server/lib/activitypub/process/process-like.ts
new file mode 100644
index 000000000..d77b30f24
--- /dev/null
+++ b/server/lib/activitypub/process/process-like.ts
@@ -0,0 +1,50 @@
+import { ActivityLike } from '../../../../shared/models/activitypub/activity'
+import { database as db } from '../../../initializers'
+import { AccountInstance } from '../../../models/account/account-interface'
+import { getOrCreateAccountAndServer } from '../account'
+import { sendLikeToVideoFollowers } from '../send/send-like'
+import { retryTransactionWrapper } from '../../../helpers/database-utils'
+
+async function processLikeActivity (activity: ActivityLike) {
+  const account = await getOrCreateAccountAndServer(activity.actor)
+
+  return processLikeVideo(account, activity.object)
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  processLikeActivity
+}
+
+// ---------------------------------------------------------------------------
+
+async function processLikeVideo (byAccount: AccountInstance, videoUrl: string) {
+  const options = {
+    arguments: [ byAccount, videoUrl ],
+    errorMessage: 'Cannot like the video with many retries.'
+  }
+
+  return retryTransactionWrapper(createVideoLike, options)
+}
+
+function createVideoLike (byAccount: AccountInstance, videoUrl: string) {
+  return db.sequelize.transaction(async t => {
+    const video = await db.Video.loadByUrlAndPopulateAccount(videoUrl)
+
+    if (!video) throw new Error('Unknown video ' + videoUrl)
+
+    const rate = {
+      type: 'like' as 'like',
+      videoId: video.id,
+      accountId: byAccount.id
+    }
+    const [ , created ] = await db.AccountVideoRate.findOrCreate({
+      where: rate,
+      defaults: rate
+    })
+    await video.increment('likes')
+
+    if (video.isOwned() && created === true) await sendLikeToVideoFollowers(byAccount, video, undefined)
+  })
+}
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
+  })
+}
diff --git a/server/lib/activitypub/process/process.ts b/server/lib/activitypub/process/process.ts
index 613597341..942bce0e6 100644
--- a/server/lib/activitypub/process/process.ts
+++ b/server/lib/activitypub/process/process.ts
@@ -1,4 +1,5 @@
 import { Activity, ActivityType } from '../../../../shared/models/activitypub/activity'
+import { logger } from '../../../helpers/logger'
 import { AccountInstance } from '../../../models/account/account-interface'
 import { processAcceptActivity } from './process-accept'
 import { processAddActivity } from './process-add'
@@ -6,9 +7,9 @@ import { processAnnounceActivity } from './process-announce'
 import { processCreateActivity } from './process-create'
 import { processDeleteActivity } from './process-delete'
 import { processFollowActivity } from './process-follow'
+import { processLikeActivity } from './process-like'
 import { processUndoActivity } from './process-undo'
 import { processUpdateActivity } from './process-update'
-import { logger } from '../../../helpers/logger'
 
 const processActivity: { [ P in ActivityType ]: (activity: Activity, inboxAccount?: AccountInstance) => Promise<any> } = {
   Create: processCreateActivity,
@@ -18,7 +19,8 @@ const processActivity: { [ P in ActivityType ]: (activity: Activity, inboxAccoun
   Follow: processFollowActivity,
   Accept: processAcceptActivity,
   Announce: processAnnounceActivity,
-  Undo: processUndoActivity
+  Undo: processUndoActivity,
+  Like: processLikeActivity
 }
 
 async function processActivities (activities: Activity[], inboxAccount?: AccountInstance) {
diff --git a/server/lib/activitypub/send/index.ts b/server/lib/activitypub/send/index.ts
index 5f15dd4b5..ee8f3ad7e 100644
--- a/server/lib/activitypub/send/index.ts
+++ b/server/lib/activitypub/send/index.ts
@@ -4,4 +4,6 @@ export * from './send-announce'
 export * from './send-create'
 export * from './send-delete'
 export * from './send-follow'
+export * from './send-like'
+export * from './send-undo'
 export * from './send-update'
diff --git a/server/lib/activitypub/send/misc.ts b/server/lib/activitypub/send/misc.ts
index f3dc5c148..41a039b19 100644
--- a/server/lib/activitypub/send/misc.ts
+++ b/server/lib/activitypub/send/misc.ts
@@ -3,6 +3,7 @@ import { logger } from '../../../helpers/logger'
 import { ACTIVITY_PUB, database as db } from '../../../initializers'
 import { AccountInstance } from '../../../models/account/account-interface'
 import { activitypubHttpJobScheduler } from '../../jobs/activitypub-http-job-scheduler/activitypub-http-job-scheduler'
+import { VideoInstance } from '../../../models/video/video-interface'
 
 async function broadcastToFollowers (
   data: any,
@@ -41,6 +42,27 @@ async function unicastTo (data: any, byAccount: AccountInstance, toAccountUrl: s
   return activitypubHttpJobScheduler.createJob(t, 'activitypubHttpUnicastHandler', jobPayload)
 }
 
+function getOriginVideoAudience (video: VideoInstance) {
+  return {
+    to: [ video.VideoChannel.Account.url ],
+    cc: [ video.VideoChannel.Account.url + '/followers' ]
+  }
+}
+
+function getVideoFollowersAudience (video: VideoInstance) {
+  return {
+    to: [ video.VideoChannel.Account.url + '/followers' ],
+    cc: []
+  }
+}
+
+async function getAccountsToForwardVideoAction (byAccount: AccountInstance, video: VideoInstance) {
+  const accountsToForwardView = await db.VideoShare.loadAccountsByShare(video.id)
+  accountsToForwardView.push(video.VideoChannel.Account)
+
+  return accountsToForwardView
+}
+
 async function getAudience (accountSender: AccountInstance, isPublic = true) {
   const followerInboxUrls = await accountSender.getFollowerSharedInboxUrls()
 
@@ -64,5 +86,8 @@ async function getAudience (accountSender: AccountInstance, isPublic = true) {
 export {
   broadcastToFollowers,
   unicastTo,
-  getAudience
+  getAudience,
+  getOriginVideoAudience,
+  getAccountsToForwardVideoAction,
+  getVideoFollowersAudience
 }
diff --git a/server/lib/activitypub/send/send-create.ts b/server/lib/activitypub/send/send-create.ts
index e5fb212b7..6afe67ee6 100644
--- a/server/lib/activitypub/send/send-create.ts
+++ b/server/lib/activitypub/send/send-create.ts
@@ -1,11 +1,17 @@
 import { Transaction } from 'sequelize'
 import { ActivityCreate } from '../../../../shared/models/activitypub/activity'
+import { getServerAccount } from '../../../helpers/utils'
 import { AccountInstance, VideoChannelInstance, VideoInstance } from '../../../models'
 import { VideoAbuseInstance } from '../../../models/video/video-abuse-interface'
-import { broadcastToFollowers, getAudience, unicastTo } from './misc'
-import { getVideoAbuseActivityPubUrl, getVideoViewActivityPubUrl } from '../url'
-import { getServerAccount } from '../../../helpers/utils'
-import { database as db } from '../../../initializers'
+import { getVideoAbuseActivityPubUrl, getVideoDislikeActivityPubUrl, getVideoViewActivityPubUrl } from '../url'
+import {
+  broadcastToFollowers,
+  getAccountsToForwardVideoAction,
+  getAudience,
+  getOriginVideoAudience,
+  getVideoFollowersAudience,
+  unicastTo
+} from './misc'
 
 async function sendCreateVideoChannel (videoChannel: VideoChannelInstance, t: Transaction) {
   const byAccount = videoChannel.Account
@@ -29,7 +35,7 @@ async function sendCreateViewToOrigin (byAccount: AccountInstance, video: VideoI
   const url = getVideoViewActivityPubUrl(byAccount, video)
   const viewActivity = createViewActivityData(byAccount, video)
 
-  const audience = { to: [ video.VideoChannel.Account.url ], cc: [ video.VideoChannel.Account.url + '/followers' ] }
+  const audience = getOriginVideoAudience(video)
   const data = await createActivityData(url, byAccount, viewActivity, audience)
 
   return unicastTo(data, byAccount, video.VideoChannel.Account.sharedInboxUrl, t)
@@ -39,16 +45,35 @@ async function sendCreateViewToVideoFollowers (byAccount: AccountInstance, video
   const url = getVideoViewActivityPubUrl(byAccount, video)
   const viewActivity = createViewActivityData(byAccount, video)
 
-  const audience = { to: [ video.VideoChannel.Account.url + '/followers' ], cc: [] }
+  const audience = getVideoFollowersAudience(video)
   const data = await createActivityData(url, byAccount, viewActivity, audience)
 
   const serverAccount = await getServerAccount()
-  const accountsToForwardView = await db.VideoShare.loadAccountsByShare(video.id)
-  accountsToForwardView.push(video.VideoChannel.Account)
+  const accountsToForwardView = await getAccountsToForwardVideoAction(byAccount, video)
+
+  const followersException = [ byAccount ]
+  return broadcastToFollowers(data, serverAccount, accountsToForwardView, t, followersException)
+}
+
+async function sendCreateDislikeToOrigin (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const url = getVideoDislikeActivityPubUrl(byAccount, video)
+  const dislikeActivity = createDislikeActivityData(byAccount, video)
+
+  const audience = getOriginVideoAudience(video)
+  const data = await createActivityData(url, byAccount, dislikeActivity, audience)
+
+  return unicastTo(data, byAccount, video.VideoChannel.Account.sharedInboxUrl, t)
+}
 
-  // Don't forward view to server that sent it to us
-  const index = accountsToForwardView.findIndex(a => a.id === byAccount.id)
-  if (index) accountsToForwardView.splice(index, 1)
+async function sendCreateDislikeToVideoFollowers (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const url = getVideoDislikeActivityPubUrl(byAccount, video)
+  const dislikeActivity = createDislikeActivityData(byAccount, video)
+
+  const audience = getVideoFollowersAudience(video)
+  const data = await createActivityData(url, byAccount, dislikeActivity, audience)
+
+  const accountsToForwardView = await getAccountsToForwardVideoAction(byAccount, video)
+  const serverAccount = await getServerAccount()
 
   const followersException = [ byAccount ]
   return broadcastToFollowers(data, serverAccount, accountsToForwardView, t, followersException)
@@ -71,6 +96,16 @@ async function createActivityData (url: string, byAccount: AccountInstance, obje
   return activity
 }
 
+function createDislikeActivityData (byAccount: AccountInstance, video: VideoInstance) {
+  const obj = {
+    type: 'Dislike',
+    actor: byAccount.url,
+    object: video.url
+  }
+
+  return obj
+}
+
 // ---------------------------------------------------------------------------
 
 export {
@@ -78,7 +113,10 @@ export {
   sendVideoAbuse,
   createActivityData,
   sendCreateViewToOrigin,
-  sendCreateViewToVideoFollowers
+  sendCreateViewToVideoFollowers,
+  sendCreateDislikeToOrigin,
+  sendCreateDislikeToVideoFollowers,
+  createDislikeActivityData
 }
 
 // ---------------------------------------------------------------------------
diff --git a/server/lib/activitypub/send/send-like.ts b/server/lib/activitypub/send/send-like.ts
new file mode 100644
index 000000000..70a7d886f
--- /dev/null
+++ b/server/lib/activitypub/send/send-like.ts
@@ -0,0 +1,60 @@
+import { Transaction } from 'sequelize'
+import { ActivityLike } from '../../../../shared/models/activitypub/activity'
+import { getServerAccount } from '../../../helpers/utils'
+import { AccountInstance, VideoInstance } from '../../../models'
+import { getVideoLikeActivityPubUrl } from '../url'
+import {
+  broadcastToFollowers,
+  getAccountsToForwardVideoAction,
+  getAudience,
+  getOriginVideoAudience,
+  getVideoFollowersAudience,
+  unicastTo
+} from './misc'
+
+async function sendLikeToOrigin (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const url = getVideoLikeActivityPubUrl(byAccount, video)
+
+  const audience = getOriginVideoAudience(video)
+  const data = await likeActivityData(url, byAccount, video, audience)
+
+  return unicastTo(data, byAccount, video.VideoChannel.Account.sharedInboxUrl, t)
+}
+
+async function sendLikeToVideoFollowers (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const url = getVideoLikeActivityPubUrl(byAccount, video)
+
+  const audience = getVideoFollowersAudience(video)
+  const data = await likeActivityData(url, byAccount, video, audience)
+
+  const accountsToForwardView = await getAccountsToForwardVideoAction(byAccount, video)
+  const serverAccount = await getServerAccount()
+
+  const followersException = [ byAccount ]
+  return broadcastToFollowers(data, serverAccount, accountsToForwardView, t, followersException)
+}
+
+async function likeActivityData (url: string, byAccount: AccountInstance, video: VideoInstance, audience?: { to: string[], cc: string[] }) {
+  if (!audience) {
+    audience = await getAudience(byAccount)
+  }
+
+  const activity: ActivityLike = {
+    type: 'Like',
+    id: url,
+    actor: byAccount.url,
+    to: audience.to,
+    cc: audience.cc,
+    object: video.url
+  }
+
+  return activity
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  sendLikeToOrigin,
+  sendLikeToVideoFollowers,
+  likeActivityData
+}
diff --git a/server/lib/activitypub/send/send-undo.ts b/server/lib/activitypub/send/send-undo.ts
index 77bee6639..53fddd0cb 100644
--- a/server/lib/activitypub/send/send-undo.ts
+++ b/server/lib/activitypub/send/send-undo.ts
@@ -1,10 +1,14 @@
 import { Transaction } from 'sequelize'
-import { ActivityFollow, ActivityUndo } from '../../../../shared/models/activitypub/activity'
+import { ActivityCreate, ActivityFollow, ActivityLike, ActivityUndo } from '../../../../shared/models/activitypub/activity'
 import { AccountInstance } from '../../../models'
 import { AccountFollowInstance } from '../../../models/account/account-follow-interface'
-import { unicastTo } from './misc'
+import { broadcastToFollowers, getAccountsToForwardVideoAction, unicastTo } from './misc'
 import { followActivityData } from './send-follow'
-import { getAccountFollowActivityPubUrl, getUndoActivityPubUrl } from '../url'
+import { getAccountFollowActivityPubUrl, getUndoActivityPubUrl, getVideoDislikeActivityPubUrl, getVideoLikeActivityPubUrl } from '../url'
+import { VideoInstance } from '../../../models/video/video-interface'
+import { likeActivityData } from './send-like'
+import { createActivityData, createDislikeActivityData } from './send-create'
+import { getServerAccount } from '../../../helpers/utils'
 
 async function sendUndoFollow (accountFollow: AccountFollowInstance, t: Transaction) {
   const me = accountFollow.AccountFollower
@@ -19,15 +23,72 @@ async function sendUndoFollow (accountFollow: AccountFollowInstance, t: Transact
   return unicastTo(data, me, following.inboxUrl, t)
 }
 
+async function sendUndoLikeToOrigin (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const likeUrl = getVideoLikeActivityPubUrl(byAccount, video)
+  const undoUrl = getUndoActivityPubUrl(likeUrl)
+
+  const object = await likeActivityData(likeUrl, byAccount, video)
+  const data = await undoActivityData(undoUrl, byAccount, object)
+
+  return unicastTo(data, byAccount, video.VideoChannel.Account.sharedInboxUrl, t)
+}
+
+async function sendUndoLikeToVideoFollowers (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const likeUrl = getVideoLikeActivityPubUrl(byAccount, video)
+  const undoUrl = getUndoActivityPubUrl(likeUrl)
+
+  const object = await likeActivityData(likeUrl, byAccount, video)
+  const data = await undoActivityData(undoUrl, byAccount, object)
+
+  const accountsToForwardView = await getAccountsToForwardVideoAction(byAccount, video)
+  const serverAccount = await getServerAccount()
+
+  const followersException = [ byAccount ]
+  return broadcastToFollowers(data, serverAccount, accountsToForwardView, t, followersException)
+}
+
+async function sendUndoDislikeToOrigin (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const dislikeUrl = getVideoDislikeActivityPubUrl(byAccount, video)
+  const undoUrl = getUndoActivityPubUrl(dislikeUrl)
+
+  const dislikeActivity = createDislikeActivityData(byAccount, video)
+  const object = await createActivityData(undoUrl, byAccount, dislikeActivity)
+
+  const data = await undoActivityData(undoUrl, byAccount, object)
+
+  return unicastTo(data, byAccount, video.VideoChannel.Account.sharedInboxUrl, t)
+}
+
+async function sendUndoDislikeToVideoFollowers (byAccount: AccountInstance, video: VideoInstance, t: Transaction) {
+  const dislikeUrl = getVideoDislikeActivityPubUrl(byAccount, video)
+  const undoUrl = getUndoActivityPubUrl(dislikeUrl)
+
+  const dislikeActivity = createDislikeActivityData(byAccount, video)
+  const object = await createActivityData(undoUrl, byAccount, dislikeActivity)
+
+  const data = await undoActivityData(undoUrl, byAccount, object)
+
+  const accountsToForwardView = await getAccountsToForwardVideoAction(byAccount, video)
+  const serverAccount = await getServerAccount()
+
+  const followersException = [ byAccount ]
+  return broadcastToFollowers(data, serverAccount, accountsToForwardView, t, followersException)
+}
+
+
 // ---------------------------------------------------------------------------
 
 export {
-  sendUndoFollow
+  sendUndoFollow,
+  sendUndoLikeToOrigin,
+  sendUndoLikeToVideoFollowers,
+  sendUndoDislikeToOrigin,
+  sendUndoDislikeToVideoFollowers
 }
 
 // ---------------------------------------------------------------------------
 
-async function undoActivityData (url: string, byAccount: AccountInstance, object: ActivityFollow) {
+async function undoActivityData (url: string, byAccount: AccountInstance, object: ActivityFollow | ActivityLike | ActivityCreate) {
   const activity: ActivityUndo = {
     type: 'Undo',
     id: url,
diff --git a/server/lib/activitypub/url.ts b/server/lib/activitypub/url.ts
index d98561e33..17395a99b 100644
--- a/server/lib/activitypub/url.ts
+++ b/server/lib/activitypub/url.ts
@@ -25,6 +25,14 @@ function getVideoViewActivityPubUrl (byAccount: AccountInstance, video: VideoIns
   return video.url + '#views/' + byAccount.uuid + '/' + new Date().toISOString()
 }
 
+function getVideoLikeActivityPubUrl (byAccount: AccountInstance, video: VideoInstance) {
+  return byAccount.url + '#likes/' + video.id
+}
+
+function getVideoDislikeActivityPubUrl (byAccount: AccountInstance, video: VideoInstance) {
+  return byAccount.url + '#dislikes/' + video.id
+}
+
 function getAccountFollowActivityPubUrl (accountFollow: AccountFollowInstance) {
   const me = accountFollow.AccountFollower
   const following = accountFollow.AccountFollowing
@@ -61,5 +69,7 @@ export {
   getAnnounceActivityPubUrl,
   getUpdateActivityPubUrl,
   getUndoActivityPubUrl,
-  getVideoViewActivityPubUrl
+  getVideoViewActivityPubUrl,
+  getVideoLikeActivityPubUrl,
+  getVideoDislikeActivityPubUrl
 }
diff --git a/server/lib/activitypub/videos.ts b/server/lib/activitypub/videos.ts
index 944244893..acee4fe16 100644
--- a/server/lib/activitypub/videos.ts
+++ b/server/lib/activitypub/videos.ts
@@ -1,9 +1,20 @@
 import { join } from 'path'
 import * as request from 'request'
+import { Transaction } from 'sequelize'
 import { ActivityIconObject } from '../../../shared/index'
 import { doRequest, doRequestAndSaveToFile } from '../../helpers/requests'
 import { CONFIG, REMOTE_SCHEME, STATIC_PATHS } from '../../initializers/constants'
+import { AccountInstance } from '../../models/account/account-interface'
 import { VideoInstance } from '../../models/video/video-interface'
+import { sendLikeToOrigin } from './index'
+import { sendCreateDislikeToOrigin, sendCreateDislikeToVideoFollowers } from './send/send-create'
+import { sendLikeToVideoFollowers } from './send/send-like'
+import {
+  sendUndoDislikeToOrigin,
+  sendUndoDislikeToVideoFollowers,
+  sendUndoLikeToOrigin,
+  sendUndoLikeToVideoFollowers
+} from './send/send-undo'
 
 function fetchRemoteVideoPreview (video: VideoInstance) {
   // FIXME: use url
@@ -37,8 +48,42 @@ function generateThumbnailFromUrl (video: VideoInstance, icon: ActivityIconObjec
   return doRequestAndSaveToFile(options, thumbnailPath)
 }
 
+function sendVideoRateChangeToFollowers (account: AccountInstance, video: VideoInstance, likes: number, dislikes: number, t: Transaction) {
+  const tasks: Promise<any>[] = []
+
+  // Undo Like
+  if (likes < 0) tasks.push(sendUndoLikeToVideoFollowers(account, video, t))
+  // Like
+  if (likes > 0) tasks.push(sendLikeToVideoFollowers(account, video, t))
+
+  // Undo Dislike
+  if (dislikes < 0) tasks.push(sendUndoDislikeToVideoFollowers(account, video, t))
+  // Dislike
+  if (dislikes > 0) tasks.push(sendCreateDislikeToVideoFollowers(account, video, t))
+
+  return Promise.all(tasks)
+}
+
+function sendVideoRateChangeToOrigin (account: AccountInstance, video: VideoInstance, likes: number, dislikes: number, t: Transaction) {
+  const tasks: Promise<any>[] = []
+
+  // Undo Like
+  if (likes < 0) tasks.push(sendUndoLikeToOrigin(account, video, t))
+  // Like
+  if (likes > 0) tasks.push(sendLikeToOrigin(account, video, t))
+
+  // Undo Dislike
+  if (dislikes < 0) tasks.push(sendUndoDislikeToOrigin(account, video, t))
+  // Dislike
+  if (dislikes > 0) tasks.push(sendCreateDislikeToOrigin(account, video, t))
+
+  return Promise.all(tasks)
+}
+
 export {
   fetchRemoteVideoPreview,
   fetchRemoteVideoDescription,
-  generateThumbnailFromUrl
+  generateThumbnailFromUrl,
+  sendVideoRateChangeToFollowers,
+  sendVideoRateChangeToOrigin
 }