11 files changed, 141 insertions, 92 deletions

diff --git a/server/lib/activitypub/activity.ts b/server/lib/activitypub/activity.ts
index 1f6ec221e..0fed3e8fd 100644
--- a/server/lib/activitypub/activity.ts
+++ b/server/lib/activitypub/activity.ts
@@ -1,4 +1,5 @@
-import { ActivityType } from '@shared/models'
+import { doJSONRequest } from '@server/helpers/requests'
+import { APObjectId, ActivityObject, ActivityPubActor, ActivityType } from '@shared/models'
 
 function getAPId (object: string | { id: string }) {
   if (typeof object === 'string') return object
@@ -32,8 +33,19 @@ function buildAvailableActivities (): ActivityType[] {
   ]
 }
 
+async function fetchAPObject <T extends (ActivityObject | ActivityPubActor)> (object: APObjectId) {
+  if (typeof object === 'string') {
+    const { body } = await doJSONRequest<Exclude<T, string>>(object, { activityPub: true })
+
+    return body
+  }
+
+  return object as Exclude<T, string>
+}
+
 export {
   getAPId,
+  fetchAPObject,
   getActivityStreamDuration,
   buildAvailableActivities,
   getDurationFromActivityStream
diff --git a/server/lib/activitypub/playlists/get.ts b/server/lib/activitypub/playlists/get.ts
index bfaf52cc9..c34554d69 100644
--- a/server/lib/activitypub/playlists/get.ts
+++ b/server/lib/activitypub/playlists/get.ts
@@ -1,12 +1,12 @@
 import { VideoPlaylistModel } from '@server/models/video/video-playlist'
 import { MVideoPlaylistFullSummary } from '@server/types/models'
-import { APObject } from '@shared/models'
+import { APObjectId } from '@shared/models'
 import { getAPId } from '../activity'
 import { createOrUpdateVideoPlaylist } from './create-update'
 import { scheduleRefreshIfNeeded } from './refresh'
 import { fetchRemoteVideoPlaylist } from './shared'
 
-async function getOrCreateAPVideoPlaylist (playlistObjectArg: APObject): Promise<MVideoPlaylistFullSummary> {
+async function getOrCreateAPVideoPlaylist (playlistObjectArg: APObjectId): Promise<MVideoPlaylistFullSummary> {
   const playlistUrl = getAPId(playlistObjectArg)
 
   const playlistFromDatabase = await VideoPlaylistModel.loadByUrlWithAccountAndChannelSummary(playlistUrl)
diff --git a/server/lib/activitypub/process/process-create.ts b/server/lib/activitypub/process/process-create.ts
index 1e6e8956c..e89d1ab45 100644
--- a/server/lib/activitypub/process/process-create.ts
+++ b/server/lib/activitypub/process/process-create.ts
@@ -1,13 +1,24 @@
 import { isBlockedByServerOrAccount } from '@server/lib/blocklist'
 import { isRedundancyAccepted } from '@server/lib/redundancy'
 import { VideoModel } from '@server/models/video/video'
-import { ActivityCreate, CacheFileObject, PlaylistObject, VideoCommentObject, VideoObject, WatchActionObject } from '@shared/models'
+import {
+  AbuseObject,
+  ActivityCreate,
+  ActivityCreateObject,
+  ActivityObject,
+  CacheFileObject,
+  PlaylistObject,
+  VideoCommentObject,
+  VideoObject,
+  WatchActionObject
+} from '@shared/models'
 import { retryTransactionWrapper } from '../../../helpers/database-utils'
 import { logger } from '../../../helpers/logger'
 import { sequelizeTypescript } from '../../../initializers/database'
 import { APProcessorOptions } from '../../../types/activitypub-processor.model'
 import { MActorSignature, MCommentOwnerVideo, MVideoAccountLightBlacklistAllFiles } from '../../../types/models'
 import { Notifier } from '../../notifier'
+import { fetchAPObject } from '../activity'
 import { createOrUpdateCacheFile } from '../cache-file'
 import { createOrUpdateLocalVideoViewer } from '../local-video-viewer'
 import { createOrUpdateVideoPlaylist } from '../playlists'
@@ -15,35 +26,35 @@ import { forwardVideoRelatedActivity } from '../send/shared/send-utils'
 import { resolveThread } from '../video-comments'
 import { getOrCreateAPVideo } from '../videos'
 
-async function processCreateActivity (options: APProcessorOptions<ActivityCreate>) {
+async function processCreateActivity (options: APProcessorOptions<ActivityCreate<ActivityCreateObject>>) {
   const { activity, byActor } = options
 
   // Only notify if it is not from a fetcher job
   const notify = options.fromFetch !== true
-  const activityObject = activity.object
+  const activityObject = await fetchAPObject<Exclude<ActivityObject, AbuseObject>>(activity.object)
   const activityType = activityObject.type
 
   if (activityType === 'Video') {
-    return processCreateVideo(activity, notify)
+    return processCreateVideo(activityObject, notify)
   }
 
   if (activityType === 'Note') {
     // Comments will be fetched from videos
     if (options.fromFetch) return
 
-    return retryTransactionWrapper(processCreateVideoComment, activity, byActor, notify)
+    return retryTransactionWrapper(processCreateVideoComment, activity, activityObject, byActor, notify)
   }
 
   if (activityType === 'WatchAction') {
-    return retryTransactionWrapper(processCreateWatchAction, activity)
+    return retryTransactionWrapper(processCreateWatchAction, activityObject)
   }
 
   if (activityType === 'CacheFile') {
-    return retryTransactionWrapper(processCreateCacheFile, activity, byActor)
+    return retryTransactionWrapper(processCreateCacheFile, activity, activityObject, byActor)
   }
 
   if (activityType === 'Playlist') {
-    return retryTransactionWrapper(processCreatePlaylist, activity, byActor)
+    return retryTransactionWrapper(processCreatePlaylist, activity, activityObject, byActor)
   }
 
   logger.warn('Unknown activity object type %s when creating activity.', activityType, { activity: activity.id })
@@ -58,9 +69,7 @@ export {
 
 // ---------------------------------------------------------------------------
 
-async function processCreateVideo (activity: ActivityCreate, notify: boolean) {
-  const videoToCreateData = activity.object as VideoObject
-
+async function processCreateVideo (videoToCreateData: VideoObject, notify: boolean) {
   const syncParam = { rates: false, shares: false, comments: false, thumbnail: true, refreshVideo: false }
   const { video, created } = await getOrCreateAPVideo({ videoObject: videoToCreateData, syncParam })
 
@@ -69,11 +78,13 @@ async function processCreateVideo (activity: ActivityCreate, notify: boolean) {
   return video
 }
 
-async function processCreateCacheFile (activity: ActivityCreate, byActor: MActorSignature) {
+async function processCreateCacheFile (
+  activity: ActivityCreate<CacheFileObject | string>,
+  cacheFile: CacheFileObject,
+  byActor: MActorSignature
+) {
   if (await isRedundancyAccepted(activity, byActor) !== true) return
 
-  const cacheFile = activity.object as CacheFileObject
-
   const { video } = await getOrCreateAPVideo({ videoObject: cacheFile.object })
 
   await sequelizeTypescript.transaction(async t => {
@@ -87,9 +98,7 @@ async function processCreateCacheFile (activity: ActivityCreate, byActor: MActor
   }
 }
 
-async function processCreateWatchAction (activity: ActivityCreate) {
-  const watchAction = activity.object as WatchActionObject
-
+async function processCreateWatchAction (watchAction: WatchActionObject) {
   if (watchAction.actionStatus !== 'CompletedActionStatus') return
 
   const video = await VideoModel.loadByUrl(watchAction.object)
@@ -100,8 +109,12 @@ async function processCreateWatchAction (activity: ActivityCreate) {
   })
 }
 
-async function processCreateVideoComment (activity: ActivityCreate, byActor: MActorSignature, notify: boolean) {
-  const commentObject = activity.object as VideoCommentObject
+async function processCreateVideoComment (
+  activity: ActivityCreate<VideoCommentObject | string>,
+  commentObject: VideoCommentObject,
+  byActor: MActorSignature,
+  notify: boolean
+) {
   const byAccount = byActor.Account
 
   if (!byAccount) throw new Error('Cannot create video comment with the non account actor ' + byActor.url)
@@ -144,8 +157,11 @@ async function processCreateVideoComment (activity: ActivityCreate, byActor: MAc
   if (created && notify) Notifier.Instance.notifyOnNewComment(comment)
 }
 
-async function processCreatePlaylist (activity: ActivityCreate, byActor: MActorSignature) {
-  const playlistObject = activity.object as PlaylistObject
+async function processCreatePlaylist (
+  activity: ActivityCreate<PlaylistObject | string>,
+  playlistObject: PlaylistObject,
+  byActor: MActorSignature
+) {
   const byAccount = byActor.Account
 
   if (!byAccount) throw new Error('Cannot create video playlist with the non account actor ' + byActor.url)
diff --git a/server/lib/activitypub/process/process-dislike.ts b/server/lib/activitypub/process/process-dislike.ts
index 44e349b22..4e270f917 100644
--- a/server/lib/activitypub/process/process-dislike.ts
+++ b/server/lib/activitypub/process/process-dislike.ts
@@ -1,5 +1,5 @@
 import { VideoModel } from '@server/models/video/video'
-import { ActivityCreate, ActivityDislike, DislikeObject } from '@shared/models'
+import { ActivityDislike } from '@shared/models'
 import { retryTransactionWrapper } from '../../../helpers/database-utils'
 import { sequelizeTypescript } from '../../../initializers/database'
 import { AccountVideoRateModel } from '../../../models/account/account-video-rate'
@@ -7,7 +7,7 @@ import { APProcessorOptions } from '../../../types/activitypub-processor.model'
 import { MActorSignature } from '../../../types/models'
 import { federateVideoIfNeeded, getOrCreateAPVideo } from '../videos'
 
-async function processDislikeActivity (options: APProcessorOptions<ActivityCreate | ActivityDislike>) {
+async function processDislikeActivity (options: APProcessorOptions<ActivityDislike>) {
   const { activity, byActor } = options
   return retryTransactionWrapper(processDislike, activity, byActor)
 }
@@ -20,11 +20,8 @@ export {
 
 // ---------------------------------------------------------------------------
 
-async function processDislike (activity: ActivityCreate | ActivityDislike, byActor: MActorSignature) {
-  const dislikeObject = activity.type === 'Dislike'
-    ? activity.object
-    : (activity.object as DislikeObject).object
-
+async function processDislike (activity: ActivityDislike, byActor: MActorSignature) {
+  const dislikeObject = activity.object
   const byAccount = byActor.Account
 
   if (!byAccount) throw new Error('Cannot create dislike with the non account actor ' + byActor.url)
diff --git a/server/lib/activitypub/process/process-flag.ts b/server/lib/activitypub/process/process-flag.ts
index 10f58ef27..bea285670 100644
--- a/server/lib/activitypub/process/process-flag.ts
+++ b/server/lib/activitypub/process/process-flag.ts
@@ -3,7 +3,7 @@ import { AccountModel } from '@server/models/account/account'
 import { VideoModel } from '@server/models/video/video'
 import { VideoCommentModel } from '@server/models/video/video-comment'
 import { abusePredefinedReasonsMap } from '@shared/core-utils/abuse'
-import { AbuseObject, AbuseState, ActivityCreate, ActivityFlag } from '@shared/models'
+import { AbuseState, ActivityFlag } from '@shared/models'
 import { retryTransactionWrapper } from '../../../helpers/database-utils'
 import { logger } from '../../../helpers/logger'
 import { sequelizeTypescript } from '../../../initializers/database'
@@ -11,7 +11,7 @@ import { getAPId } from '../../../lib/activitypub/activity'
 import { APProcessorOptions } from '../../../types/activitypub-processor.model'
 import { MAccountDefault, MActorSignature, MCommentOwnerVideo } from '../../../types/models'
 
-async function processFlagActivity (options: APProcessorOptions<ActivityCreate | ActivityFlag>) {
+async function processFlagActivity (options: APProcessorOptions<ActivityFlag>) {
   const { activity, byActor } = options
 
   return retryTransactionWrapper(processCreateAbuse, activity, byActor)
@@ -25,9 +25,7 @@ export {
 
 // ---------------------------------------------------------------------------
 
-async function processCreateAbuse (activity: ActivityCreate | ActivityFlag, byActor: MActorSignature) {
-  const flag = activity.type === 'Flag' ? activity : (activity.object as AbuseObject)
-
+async function processCreateAbuse (flag: ActivityFlag, byActor: MActorSignature) {
   const account = byActor.Account
   if (!account) throw new Error('Cannot create abuse with the non account actor ' + byActor.url)
 
diff --git a/server/lib/activitypub/process/process-undo.ts b/server/lib/activitypub/process/process-undo.ts
index 99423a72b..25f68724d 100644
--- a/server/lib/activitypub/process/process-undo.ts
+++ b/server/lib/activitypub/process/process-undo.ts
@@ -1,6 +1,14 @@
 import { VideoModel } from '@server/models/video/video'
-import { ActivityAnnounce, ActivityFollow, ActivityLike, ActivityUndo, CacheFileObject } from '../../../../shared/models/activitypub'
-import { DislikeObject } from '../../../../shared/models/activitypub/objects'
+import {
+  ActivityAnnounce,
+  ActivityCreate,
+  ActivityDislike,
+  ActivityFollow,
+  ActivityLike,
+  ActivityUndo,
+  ActivityUndoObject,
+  CacheFileObject
+} from '../../../../shared/models/activitypub'
 import { retryTransactionWrapper } from '../../../helpers/database-utils'
 import { logger } from '../../../helpers/logger'
 import { sequelizeTypescript } from '../../../initializers/database'
@@ -11,10 +19,11 @@ import { VideoRedundancyModel } from '../../../models/redundancy/video-redundanc
 import { VideoShareModel } from '../../../models/video/video-share'
 import { APProcessorOptions } from '../../../types/activitypub-processor.model'
 import { MActorSignature } from '../../../types/models'
+import { fetchAPObject } from '../activity'
 import { forwardVideoRelatedActivity } from '../send/shared/send-utils'
 import { federateVideoIfNeeded, getOrCreateAPVideo } from '../videos'
 
-async function processUndoActivity (options: APProcessorOptions<ActivityUndo>) {
+async function processUndoActivity (options: APProcessorOptions<ActivityUndo<ActivityUndoObject>>) {
   const { activity, byActor } = options
   const activityToUndo = activity.object
 
@@ -23,8 +32,10 @@ async function processUndoActivity (options: APProcessorOptions<ActivityUndo>) {
   }
 
   if (activityToUndo.type === 'Create') {
-    if (activityToUndo.object.type === 'CacheFile') {
-      return retryTransactionWrapper(processUndoCacheFile, byActor, activity)
+    const objectToUndo = await fetchAPObject<CacheFileObject>(activityToUndo.object)
+
+    if (objectToUndo.type === 'CacheFile') {
+      return retryTransactionWrapper(processUndoCacheFile, byActor, activity, objectToUndo)
     }
   }
 
@@ -53,8 +64,8 @@ export {
 
 // ---------------------------------------------------------------------------
 
-async function processUndoLike (byActor: MActorSignature, activity: ActivityUndo) {
-  const likeActivity = activity.object as ActivityLike
+async function processUndoLike (byActor: MActorSignature, activity: ActivityUndo<ActivityLike>) {
+  const likeActivity = activity.object
 
   const { video: onlyVideo } = await getOrCreateAPVideo({ videoObject: likeActivity.object })
   // We don't care about likes of remote videos
@@ -78,12 +89,10 @@ async function processUndoLike (byActor: MActorSignature, activity: ActivityUndo
   })
 }
 
-async function processUndoDislike (byActor: MActorSignature, activity: ActivityUndo) {
-  const dislike = activity.object.type === 'Dislike'
-    ? activity.object
-    : activity.object.object as DislikeObject
+async function processUndoDislike (byActor: MActorSignature, activity: ActivityUndo<ActivityDislike>) {
+  const dislikeActivity = activity.object
 
-  const { video: onlyVideo } = await getOrCreateAPVideo({ videoObject: dislike.object })
+  const { video: onlyVideo } = await getOrCreateAPVideo({ videoObject: dislikeActivity.object })
   // We don't care about likes of remote videos
   if (!onlyVideo.isOwned()) return
 
@@ -91,7 +100,7 @@ async function processUndoDislike (byActor: MActorSignature, activity: ActivityU
     if (!byActor.Account) throw new Error('Unknown account ' + byActor.url)
 
     const video = await VideoModel.loadFull(onlyVideo.id, t)
-    const rate = await AccountVideoRateModel.loadByAccountAndVideoOrUrl(byActor.Account.id, video.id, dislike.id, t)
+    const rate = await AccountVideoRateModel.loadByAccountAndVideoOrUrl(byActor.Account.id, video.id, dislikeActivity.id, t)
     if (!rate || rate.type !== 'dislike') {
       logger.warn(`Unknown dislike by account %d for video %d.`, byActor.Account.id, video.id)
       return
@@ -107,9 +116,11 @@ async function processUndoDislike (byActor: MActorSignature, activity: ActivityU
 
 // ---------------------------------------------------------------------------
 
-async function processUndoCacheFile (byActor: MActorSignature, activity: ActivityUndo) {
-  const cacheFileObject = activity.object.object as CacheFileObject
-
+async function processUndoCacheFile (
+  byActor: MActorSignature,
+  activity: ActivityUndo<ActivityCreate<CacheFileObject>>,
+  cacheFileObject: CacheFileObject
+) {
   const { video } = await getOrCreateAPVideo({ videoObject: cacheFileObject.object })
 
   return sequelizeTypescript.transaction(async t => {
diff --git a/server/lib/activitypub/process/process-update.ts b/server/lib/activitypub/process/process-update.ts
index 4afdbd430..9caa74e04 100644
--- a/server/lib/activitypub/process/process-update.ts
+++ b/server/lib/activitypub/process/process-update.ts
@@ -1,5 +1,5 @@
 import { isRedundancyAccepted } from '@server/lib/redundancy'
-import { ActivityUpdate, CacheFileObject, VideoObject } from '../../../../shared/models/activitypub'
+import { ActivityUpdate, ActivityUpdateObject, CacheFileObject, VideoObject } from '../../../../shared/models/activitypub'
 import { ActivityPubActor } from '../../../../shared/models/activitypub/activitypub-actor'
 import { PlaylistObject } from '../../../../shared/models/activitypub/objects/playlist-object'
 import { isCacheFileObjectValid } from '../../../helpers/custom-validators/activitypub/cache-file'
@@ -10,16 +10,18 @@ import { sequelizeTypescript } from '../../../initializers/database'
 import { ActorModel } from '../../../models/actor/actor'
 import { APProcessorOptions } from '../../../types/activitypub-processor.model'
 import { MActorFull, MActorSignature } from '../../../types/models'
+import { fetchAPObject } from '../activity'
 import { APActorUpdater } from '../actors/updater'
 import { createOrUpdateCacheFile } from '../cache-file'
 import { createOrUpdateVideoPlaylist } from '../playlists'
 import { forwardVideoRelatedActivity } from '../send/shared/send-utils'
 import { APVideoUpdater, getOrCreateAPVideo } from '../videos'
 
-async function processUpdateActivity (options: APProcessorOptions<ActivityUpdate>) {
+async function processUpdateActivity (options: APProcessorOptions<ActivityUpdate<ActivityUpdateObject>>) {
   const { activity, byActor } = options
 
-  const objectType = activity.object.type
+  const object = await fetchAPObject(activity.object)
+  const objectType = object.type
 
   if (objectType === 'Video') {
     return retryTransactionWrapper(processUpdateVideo, activity)
@@ -28,17 +30,17 @@ async function processUpdateActivity (options: APProcessorOptions<ActivityUpdate
   if (objectType === 'Person' || objectType === 'Application' || objectType === 'Group') {
     // We need more attributes
     const byActorFull = await ActorModel.loadByUrlAndPopulateAccountAndChannel(byActor.url)
-    return retryTransactionWrapper(processUpdateActor, byActorFull, activity)
+    return retryTransactionWrapper(processUpdateActor, byActorFull, object)
   }
 
   if (objectType === 'CacheFile') {
     // We need more attributes
     const byActorFull = await ActorModel.loadByUrlAndPopulateAccountAndChannel(byActor.url)
-    return retryTransactionWrapper(processUpdateCacheFile, byActorFull, activity)
+    return retryTransactionWrapper(processUpdateCacheFile, byActorFull, activity, object)
   }
 
   if (objectType === 'Playlist') {
-    return retryTransactionWrapper(processUpdatePlaylist, byActor, activity)
+    return retryTransactionWrapper(processUpdatePlaylist, byActor, activity, object)
   }
 
   return undefined
@@ -52,7 +54,7 @@ export {
 
 // ---------------------------------------------------------------------------
 
-async function processUpdateVideo (activity: ActivityUpdate) {
+async function processUpdateVideo (activity: ActivityUpdate<VideoObject | string>) {
   const videoObject = activity.object as VideoObject
 
   if (sanitizeAndCheckVideoTorrentObject(videoObject) === false) {
@@ -72,11 +74,13 @@ async function processUpdateVideo (activity: ActivityUpdate) {
   return updater.update(activity.to)
 }
 
-async function processUpdateCacheFile (byActor: MActorSignature, activity: ActivityUpdate) {
+async function processUpdateCacheFile (
+  byActor: MActorSignature,
+  activity: ActivityUpdate<CacheFileObject | string>,
+  cacheFileObject: CacheFileObject
+) {
   if (await isRedundancyAccepted(activity, byActor) !== true) return
 
-  const cacheFileObject = activity.object as CacheFileObject
-
   if (!isCacheFileObjectValid(cacheFileObject)) {
     logger.debug('Cache file object sent by update is not valid.', { cacheFileObject })
     return undefined
@@ -96,19 +100,19 @@ async function processUpdateCacheFile (byActor: MActorSignature, activity: Activ
   }
 }
 
-async function processUpdateActor (actor: MActorFull, activity: ActivityUpdate) {
-  const actorObject = activity.object as ActivityPubActor
-
+async function processUpdateActor (actor: MActorFull, actorObject: ActivityPubActor) {
   logger.debug('Updating remote account "%s".', actorObject.url)
 
   const updater = new APActorUpdater(actorObject, actor)
   return updater.update()
 }
 
-async function processUpdatePlaylist (byActor: MActorSignature, activity: ActivityUpdate) {
-  const playlistObject = activity.object as PlaylistObject
+async function processUpdatePlaylist (
+  byActor: MActorSignature,
+  activity: ActivityUpdate<PlaylistObject | string>,
+  playlistObject: PlaylistObject
+) {
   const byAccount = byActor.Account
-
   if (!byAccount) throw new Error('Cannot update video playlist with the non account actor ' + byActor.url)
 
   await createOrUpdateVideoPlaylist(playlistObject, activity.to)
diff --git a/server/lib/activitypub/send/send-create.ts b/server/lib/activitypub/send/send-create.ts
index 0e996ab80..2cd4db14d 100644
--- a/server/lib/activitypub/send/send-create.ts
+++ b/server/lib/activitypub/send/send-create.ts
@@ -1,6 +1,14 @@
 import { Transaction } from 'sequelize'
 import { getServerActor } from '@server/models/application/application'
-import { ActivityAudience, ActivityCreate, ContextType, VideoPlaylistPrivacy, VideoPrivacy } from '@shared/models'
+import {
+  ActivityAudience,
+  ActivityCreate,
+  ActivityCreateObject,
+  ContextType,
+  VideoCommentObject,
+  VideoPlaylistPrivacy,
+  VideoPrivacy
+} from '@shared/models'
 import { logger, loggerTagsFactory } from '../../../helpers/logger'
 import { VideoCommentModel } from '../../../models/video/video-comment'
 import {
@@ -107,7 +115,7 @@ async function sendCreateVideoComment (comment: MCommentOwnerVideo, transaction:
 
   const byActor = comment.Account.Actor
   const threadParentComments = await VideoCommentModel.listThreadParentComments(comment, transaction)
-  const commentObject = comment.toActivityPubObject(threadParentComments)
+  const commentObject = comment.toActivityPubObject(threadParentComments) as VideoCommentObject
 
   const actorsInvolvedInComment = await getActorsInvolvedInVideo(comment.Video, transaction)
   // Add the actor that commented too
@@ -168,7 +176,12 @@ async function sendCreateVideoComment (comment: MCommentOwnerVideo, transaction:
   })
 }
 
-function buildCreateActivity (url: string, byActor: MActorLight, object: any, audience?: ActivityAudience): ActivityCreate {
+function buildCreateActivity <T extends ActivityCreateObject> (
+  url: string,
+  byActor: MActorLight,
+  object: T,
+  audience?: ActivityAudience
+): ActivityCreate<T> {
   if (!audience) audience = getAudience(byActor)
 
   return audiencify(
@@ -176,7 +189,9 @@ function buildCreateActivity (url: string, byActor: MActorLight, object: any, au
       type: 'Create' as 'Create',
       id: url + '/activity',
       actor: byActor.url,
-      object: audiencify(object, audience)
+      object: typeof object === 'string'
+        ? object
+        : audiencify(object, audience)
     },
     audience
   )
diff --git a/server/lib/activitypub/send/send-undo.ts b/server/lib/activitypub/send/send-undo.ts
index b8eb47ff6..b0b48c9c4 100644
--- a/server/lib/activitypub/send/send-undo.ts
+++ b/server/lib/activitypub/send/send-undo.ts
@@ -1,14 +1,5 @@
 import { Transaction } from 'sequelize'
-import {
-  ActivityAnnounce,
-  ActivityAudience,
-  ActivityCreate,
-  ActivityDislike,
-  ActivityFollow,
-  ActivityLike,
-  ActivityUndo,
-  ContextType
-} from '@shared/models'
+import { ActivityAudience, ActivityDislike, ActivityLike, ActivityUndo, ActivityUndoObject, ContextType } from '@shared/models'
 import { logger } from '../../../helpers/logger'
 import { VideoModel } from '../../../models/video/video'
 import {
@@ -128,12 +119,12 @@ export {
 
 // ---------------------------------------------------------------------------
 
-function undoActivityData (
+function undoActivityData <T extends ActivityUndoObject> (
   url: string,
   byActor: MActorAudience,
-  object: ActivityFollow | ActivityLike | ActivityDislike | ActivityCreate | ActivityAnnounce,
+  object: T,
   audience?: ActivityAudience
-): ActivityUndo {
+): ActivityUndo<T> {
   if (!audience) audience = getAudience(byActor)
 
   return audiencify(
@@ -151,7 +142,7 @@ async function sendUndoVideoRelatedActivity (options: {
   byActor: MActor
   video: MVideoAccountLight
   url: string
-  activity: ActivityFollow | ActivityCreate | ActivityAnnounce
+  activity: ActivityUndoObject
   contextType: ContextType
   transaction: Transaction
 }) {
diff --git a/server/lib/activitypub/send/send-update.ts b/server/lib/activitypub/send/send-update.ts
index 3d2b437e4..f3fb741c6 100644
--- a/server/lib/activitypub/send/send-update.ts
+++ b/server/lib/activitypub/send/send-update.ts
@@ -1,6 +1,6 @@
 import { Transaction } from 'sequelize'
 import { getServerActor } from '@server/models/application/application'
-import { ActivityAudience, ActivityUpdate, VideoPlaylistPrivacy, VideoPrivacy } from '@shared/models'
+import { ActivityAudience, ActivityUpdate, ActivityUpdateObject, VideoPlaylistPrivacy, VideoPrivacy } from '@shared/models'
 import { logger } from '../../../helpers/logger'
 import { AccountModel } from '../../../models/account/account'
 import { VideoModel } from '../../../models/video/video'
@@ -137,7 +137,12 @@ export {
 
 // ---------------------------------------------------------------------------
 
-function buildUpdateActivity (url: string, byActor: MActorLight, object: any, audience?: ActivityAudience): ActivityUpdate {
+function buildUpdateActivity (
+  url: string,
+  byActor: MActorLight,
+  object: ActivityUpdateObject,
+  audience?: ActivityAudience
+): ActivityUpdate<ActivityUpdateObject> {
   if (!audience) audience = getAudience(byActor)
 
   return audiencify(
diff --git a/server/lib/activitypub/videos/get.ts b/server/lib/activitypub/videos/get.ts
index 14ba55034..92387c5d4 100644
--- a/server/lib/activitypub/videos/get.ts
+++ b/server/lib/activitypub/videos/get.ts
@@ -3,7 +3,7 @@ import { logger } from '@server/helpers/logger'
 import { JobQueue } from '@server/lib/job-queue'
 import { loadVideoByUrl, VideoLoadByUrlType } from '@server/lib/model-loaders'
 import { MVideoAccountLightBlacklistAllFiles, MVideoImmutable, MVideoThumbnail } from '@server/types/models'
-import { APObject } from '@shared/models'
+import { APObjectId } from '@shared/models'
 import { getAPId } from '../activity'
 import { refreshVideoIfNeeded } from './refresh'
 import { APVideoCreator, fetchRemoteVideo, SyncParam, syncVideoExternalAttributes } from './shared'
@@ -15,21 +15,21 @@ type GetVideoResult <T> = Promise<{
 }>
 
 type GetVideoParamAll = {
-  videoObject: APObject
+  videoObject: APObjectId
   syncParam?: SyncParam
   fetchType?: 'all'
   allowRefresh?: boolean
 }
 
 type GetVideoParamImmutable = {
-  videoObject: APObject
+  videoObject: APObjectId
   syncParam?: SyncParam
   fetchType: 'only-immutable-attributes'
   allowRefresh: false
 }
 
 type GetVideoParamOther = {
-  videoObject: APObject
+  videoObject: APObjectId
   syncParam?: SyncParam
   fetchType?: 'all' | 'only-video'
   allowRefresh?: boolean