9 files changed, 1057 insertions, 0 deletions

diff --git a/server/lib/activitypub/videos/federate.ts b/server/lib/activitypub/videos/federate.ts
new file mode 100644
index 000000000..bd0c54b0c
--- /dev/null
+++ b/server/lib/activitypub/videos/federate.ts
@@ -0,0 +1,36 @@
+import { Transaction } from 'sequelize/types'
+import { isArray } from '@server/helpers/custom-validators/misc'
+import { MVideoAP, MVideoAPWithoutCaption } from '@server/types/models'
+import { sendCreateVideo, sendUpdateVideo } from '../send'
+import { shareVideoByServerAndChannel } from '../share'
+
+async function federateVideoIfNeeded (videoArg: MVideoAPWithoutCaption, isNewVideo: boolean, transaction?: Transaction) {
+  const video = videoArg as MVideoAP
+
+  if (
+    // Check this is not a blacklisted video, or unfederated blacklisted video
+    (video.isBlacklisted() === false || (isNewVideo === false && video.VideoBlacklist.unfederated === false)) &&
+    // Check the video is public/unlisted and published
+    video.hasPrivacyForFederation() && video.hasStateForFederation()
+  ) {
+    // Fetch more attributes that we will need to serialize in AP object
+    if (isArray(video.VideoCaptions) === false) {
+      video.VideoCaptions = await video.$get('VideoCaptions', {
+        attributes: [ 'filename', 'language' ],
+        transaction
+      })
+    }
+
+    if (isNewVideo) {
+      // Now we'll add the video's meta data to our followers
+      await sendCreateVideo(video, transaction)
+      await shareVideoByServerAndChannel(video, transaction)
+    } else {
+      await sendUpdateVideo(video, transaction)
+    }
+  }
+}
+
+export {
+  federateVideoIfNeeded
+}
diff --git a/server/lib/activitypub/videos/fetch.ts b/server/lib/activitypub/videos/fetch.ts
new file mode 100644
index 000000000..fdcf4ee5c
--- /dev/null
+++ b/server/lib/activitypub/videos/fetch.ts
@@ -0,0 +1,202 @@
+import { checkUrlsSameHost, getAPId } from "@server/helpers/activitypub"
+import { sanitizeAndCheckVideoTorrentObject } from "@server/helpers/custom-validators/activitypub/videos"
+import { retryTransactionWrapper } from "@server/helpers/database-utils"
+import { logger } from "@server/helpers/logger"
+import { doJSONRequest, PeerTubeRequestError } from "@server/helpers/requests"
+import { fetchVideoByUrl, VideoFetchByUrlType } from "@server/helpers/video"
+import { REMOTE_SCHEME } from "@server/initializers/constants"
+import { ActorFollowScoreCache } from "@server/lib/files-cache"
+import { JobQueue } from "@server/lib/job-queue"
+import { VideoModel } from "@server/models/video/video"
+import { MVideoAccountLight, MVideoAccountLightBlacklistAllFiles, MVideoImmutable, MVideoThumbnail } from "@server/types/models"
+import { HttpStatusCode } from "@shared/core-utils"
+import { VideoObject } from "@shared/models"
+import { getOrCreateActorAndServerAndModel } from "../actor"
+import { SyncParam, syncVideoExternalAttributes } from "./shared"
+import { createVideo } from "./shared/video-create"
+import { APVideoUpdater } from "./update"
+
+async function fetchRemoteVideo (videoUrl: string): Promise<{ statusCode: number, videoObject: VideoObject }> {
+  logger.info('Fetching remote video %s.', videoUrl)
+
+  const { statusCode, body } = await doJSONRequest<any>(videoUrl, { activityPub: true })
+
+  if (sanitizeAndCheckVideoTorrentObject(body) === false || checkUrlsSameHost(body.id, videoUrl) !== true) {
+    logger.debug('Remote video JSON is not valid.', { body })
+    return { statusCode, videoObject: undefined }
+  }
+
+  return { statusCode, videoObject: body }
+}
+
+async function fetchRemoteVideoDescription (video: MVideoAccountLight) {
+  const host = video.VideoChannel.Account.Actor.Server.host
+  const path = video.getDescriptionAPIPath()
+  const url = REMOTE_SCHEME.HTTP + '://' + host + path
+
+  const { body } = await doJSONRequest<any>(url)
+  return body.description || ''
+}
+
+function getOrCreateVideoChannelFromVideoObject (videoObject: VideoObject) {
+  const channel = videoObject.attributedTo.find(a => a.type === 'Group')
+  if (!channel) throw new Error('Cannot find associated video channel to video ' + videoObject.url)
+
+  if (checkUrlsSameHost(channel.id, videoObject.id) !== true) {
+    throw new Error(`Video channel url ${channel.id} does not have the same host than video object id ${videoObject.id}`)
+  }
+
+  return getOrCreateActorAndServerAndModel(channel.id, 'all')
+}
+
+type GetVideoResult <T> = Promise<{
+  video: T
+  created: boolean
+  autoBlacklisted?: boolean
+}>
+
+type GetVideoParamAll = {
+  videoObject: { id: string } | string
+  syncParam?: SyncParam
+  fetchType?: 'all'
+  allowRefresh?: boolean
+}
+
+type GetVideoParamImmutable = {
+  videoObject: { id: string } | string
+  syncParam?: SyncParam
+  fetchType: 'only-immutable-attributes'
+  allowRefresh: false
+}
+
+type GetVideoParamOther = {
+  videoObject: { id: string } | string
+  syncParam?: SyncParam
+  fetchType?: 'all' | 'only-video'
+  allowRefresh?: boolean
+}
+
+function getOrCreateVideoAndAccountAndChannel (options: GetVideoParamAll): GetVideoResult<MVideoAccountLightBlacklistAllFiles>
+function getOrCreateVideoAndAccountAndChannel (options: GetVideoParamImmutable): GetVideoResult<MVideoImmutable>
+function getOrCreateVideoAndAccountAndChannel (
+  options: GetVideoParamOther
+): GetVideoResult<MVideoAccountLightBlacklistAllFiles | MVideoThumbnail>
+async function getOrCreateVideoAndAccountAndChannel (
+  options: GetVideoParamAll | GetVideoParamImmutable | GetVideoParamOther
+): GetVideoResult<MVideoAccountLightBlacklistAllFiles | MVideoThumbnail | MVideoImmutable> {
+  // Default params
+  const syncParam = options.syncParam || { likes: true, dislikes: true, shares: true, comments: true, thumbnail: true, refreshVideo: false }
+  const fetchType = options.fetchType || 'all'
+  const allowRefresh = options.allowRefresh !== false
+
+  // Get video url
+  const videoUrl = getAPId(options.videoObject)
+  let videoFromDatabase = await fetchVideoByUrl(videoUrl, fetchType)
+
+  if (videoFromDatabase) {
+    // If allowRefresh is true, we could not call this function using 'only-immutable-attributes' fetch type
+    if (allowRefresh === true && (videoFromDatabase as MVideoThumbnail).isOutdated()) {
+      const refreshOptions = {
+        video: videoFromDatabase as MVideoThumbnail,
+        fetchedType: fetchType,
+        syncParam
+      }
+
+      if (syncParam.refreshVideo === true) {
+        videoFromDatabase = await refreshVideoIfNeeded(refreshOptions)
+      } else {
+        await JobQueue.Instance.createJobWithPromise({
+          type: 'activitypub-refresher',
+          payload: { type: 'video', url: videoFromDatabase.url }
+        })
+      }
+    }
+
+    return { video: videoFromDatabase, created: false }
+  }
+
+  const { videoObject: fetchedVideo } = await fetchRemoteVideo(videoUrl)
+  if (!fetchedVideo) throw new Error('Cannot fetch remote video with url: ' + videoUrl)
+
+  const actor = await getOrCreateVideoChannelFromVideoObject(fetchedVideo)
+  const videoChannel = actor.VideoChannel
+
+  try {
+    const { autoBlacklisted, videoCreated } = await retryTransactionWrapper(createVideo, fetchedVideo, videoChannel, syncParam.thumbnail)
+
+    await syncVideoExternalAttributes(videoCreated, fetchedVideo, syncParam)
+
+    return { video: videoCreated, created: true, autoBlacklisted }
+  } catch (err) {
+    // Maybe a concurrent getOrCreateVideoAndAccountAndChannel call created this video
+    if (err.name === 'SequelizeUniqueConstraintError') {
+      const fallbackVideo = await fetchVideoByUrl(videoUrl, fetchType)
+      if (fallbackVideo) return { video: fallbackVideo, created: false }
+    }
+
+    throw err
+  }
+}
+
+async function refreshVideoIfNeeded (options: {
+  video: MVideoThumbnail
+  fetchedType: VideoFetchByUrlType
+  syncParam: SyncParam
+}): Promise<MVideoThumbnail> {
+  if (!options.video.isOutdated()) return options.video
+
+  // We need more attributes if the argument video was fetched with not enough joints
+  const video = options.fetchedType === 'all'
+    ? options.video as MVideoAccountLightBlacklistAllFiles
+    : await VideoModel.loadByUrlAndPopulateAccount(options.video.url)
+
+  try {
+    const { videoObject } = await fetchRemoteVideo(video.url)
+
+    if (videoObject === undefined) {
+      logger.warn('Cannot refresh remote video %s: invalid body.', video.url)
+
+      await video.setAsRefreshed()
+      return video
+    }
+
+    const channelActor = await getOrCreateVideoChannelFromVideoObject(videoObject)
+
+    const videoUpdater = new APVideoUpdater({
+      video,
+      videoObject,
+      channel: channelActor.VideoChannel
+    })
+    await videoUpdater.update()
+
+    await syncVideoExternalAttributes(video, videoObject, options.syncParam)
+
+    ActorFollowScoreCache.Instance.addGoodServerId(video.VideoChannel.Actor.serverId)
+
+    return video
+  } catch (err) {
+    if ((err as PeerTubeRequestError).statusCode === HttpStatusCode.NOT_FOUND_404) {
+      logger.info('Cannot refresh remote video %s: video does not exist anymore. Deleting it.', video.url)
+
+      // Video does not exist anymore
+      await video.destroy()
+      return undefined
+    }
+
+    logger.warn('Cannot refresh video %s.', options.video.url, { err })
+
+    ActorFollowScoreCache.Instance.addBadServerId(video.VideoChannel.Actor.serverId)
+
+    // Don't refresh in loop
+    await video.setAsRefreshed()
+    return video
+  }
+}
+
+export {
+  fetchRemoteVideo,
+  fetchRemoteVideoDescription,
+  refreshVideoIfNeeded,
+  getOrCreateVideoChannelFromVideoObject,
+  getOrCreateVideoAndAccountAndChannel
+}
diff --git a/server/lib/activitypub/videos/index.ts b/server/lib/activitypub/videos/index.ts
new file mode 100644
index 000000000..0e126c85a
--- /dev/null
+++ b/server/lib/activitypub/videos/index.ts
@@ -0,0 +1,3 @@
+export * from './federate'
+export * from './fetch'
+export * from './update'
diff --git a/server/lib/activitypub/videos/shared/index.ts b/server/lib/activitypub/videos/shared/index.ts
new file mode 100644
index 000000000..4d24fbc6a
--- /dev/null
+++ b/server/lib/activitypub/videos/shared/index.ts
@@ -0,0 +1,4 @@
+export * from './object-to-model-attributes'
+export * from './trackers'
+export * from './video-create'
+export * from './video-sync-attributes'
diff --git a/server/lib/activitypub/videos/shared/object-to-model-attributes.ts b/server/lib/activitypub/videos/shared/object-to-model-attributes.ts
new file mode 100644
index 000000000..8a8105500
--- /dev/null
+++ b/server/lib/activitypub/videos/shared/object-to-model-attributes.ts
@@ -0,0 +1,234 @@
+import { maxBy, minBy } from 'lodash'
+import * as magnetUtil from 'magnet-uri'
+import { basename } from 'path'
+import { isAPVideoFileUrlMetadataObject } from '@server/helpers/custom-validators/activitypub/videos'
+import { isVideoFileInfoHashValid } from '@server/helpers/custom-validators/videos'
+import { logger } from '@server/helpers/logger'
+import { getExtFromMimetype } from '@server/helpers/video'
+import { ACTIVITY_PUB, MIMETYPES, P2P_MEDIA_LOADER_PEER_VERSION, PREVIEWS_SIZE, THUMBNAILS_SIZE } from '@server/initializers/constants'
+import { generateTorrentFileName } from '@server/lib/video-paths'
+import { VideoFileModel } from '@server/models/video/video-file'
+import { VideoStreamingPlaylistModel } from '@server/models/video/video-streaming-playlist'
+import { FilteredModelAttributes } from '@server/types'
+import { MChannelId, MStreamingPlaylist, MStreamingPlaylistVideo, MVideo, MVideoFile, MVideoId } from '@server/types/models'
+import {
+  ActivityHashTagObject,
+  ActivityMagnetUrlObject,
+  ActivityPlaylistSegmentHashesObject,
+  ActivityPlaylistUrlObject,
+  ActivityTagObject,
+  ActivityUrlObject,
+  ActivityVideoUrlObject,
+  VideoObject,
+  VideoPrivacy,
+  VideoStreamingPlaylistType
+} from '@shared/models'
+
+function getThumbnailFromIcons (videoObject: VideoObject) {
+  let validIcons = videoObject.icon.filter(i => i.width > THUMBNAILS_SIZE.minWidth)
+  // Fallback if there are not valid icons
+  if (validIcons.length === 0) validIcons = videoObject.icon
+
+  return minBy(validIcons, 'width')
+}
+
+function getPreviewFromIcons (videoObject: VideoObject) {
+  const validIcons = videoObject.icon.filter(i => i.width > PREVIEWS_SIZE.minWidth)
+
+  return maxBy(validIcons, 'width')
+}
+
+function getTagsFromObject (videoObject: VideoObject) {
+  return videoObject.tag
+    .filter(isAPHashTagObject)
+    .map(t => t.name)
+}
+
+function videoFileActivityUrlToDBAttributes (
+  videoOrPlaylist: MVideo | MStreamingPlaylistVideo,
+  urls: (ActivityTagObject | ActivityUrlObject)[]
+) {
+  const fileUrls = urls.filter(u => isAPVideoUrlObject(u)) as ActivityVideoUrlObject[]
+
+  if (fileUrls.length === 0) return []
+
+  const attributes: FilteredModelAttributes<VideoFileModel>[] = []
+  for (const fileUrl of fileUrls) {
+    // Fetch associated magnet uri
+    const magnet = urls.filter(isAPMagnetUrlObject)
+                       .find(u => u.height === fileUrl.height)
+
+    if (!magnet) throw new Error('Cannot find associated magnet uri for file ' + fileUrl.href)
+
+    const parsed = magnetUtil.decode(magnet.href)
+    if (!parsed || isVideoFileInfoHashValid(parsed.infoHash) === false) {
+      throw new Error('Cannot parse magnet URI ' + magnet.href)
+    }
+
+    const torrentUrl = Array.isArray(parsed.xs)
+      ? parsed.xs[0]
+      : parsed.xs
+
+    // Fetch associated metadata url, if any
+    const metadata = urls.filter(isAPVideoFileUrlMetadataObject)
+                         .find(u => {
+                           return u.height === fileUrl.height &&
+                             u.fps === fileUrl.fps &&
+                             u.rel.includes(fileUrl.mediaType)
+                         })
+
+    const extname = getExtFromMimetype(MIMETYPES.VIDEO.MIMETYPE_EXT, fileUrl.mediaType)
+    const resolution = fileUrl.height
+    const videoId = (videoOrPlaylist as MStreamingPlaylist).playlistUrl ? null : videoOrPlaylist.id
+    const videoStreamingPlaylistId = (videoOrPlaylist as MStreamingPlaylist).playlistUrl ? videoOrPlaylist.id : null
+
+    const attribute = {
+      extname,
+      infoHash: parsed.infoHash,
+      resolution,
+      size: fileUrl.size,
+      fps: fileUrl.fps || -1,
+      metadataUrl: metadata?.href,
+
+      // Use the name of the remote file because we don't proxify video file requests
+      filename: basename(fileUrl.href),
+      fileUrl: fileUrl.href,
+
+      torrentUrl,
+      // Use our own torrent name since we proxify torrent requests
+      torrentFilename: generateTorrentFileName(videoOrPlaylist, resolution),
+
+      // This is a video file owned by a video or by a streaming playlist
+      videoId,
+      videoStreamingPlaylistId
+    }
+
+    attributes.push(attribute)
+  }
+
+  return attributes
+}
+
+function streamingPlaylistActivityUrlToDBAttributes (video: MVideoId, videoObject: VideoObject, videoFiles: MVideoFile[]) {
+  const playlistUrls = videoObject.url.filter(u => isAPStreamingPlaylistUrlObject(u)) as ActivityPlaylistUrlObject[]
+  if (playlistUrls.length === 0) return []
+
+  const attributes: (FilteredModelAttributes<VideoStreamingPlaylistModel> & { tagAPObject?: ActivityTagObject[] })[] = []
+  for (const playlistUrlObject of playlistUrls) {
+    const segmentsSha256UrlObject = playlistUrlObject.tag.find(isAPPlaylistSegmentHashesUrlObject)
+
+    let files: unknown[] = playlistUrlObject.tag.filter(u => isAPVideoUrlObject(u)) as ActivityVideoUrlObject[]
+
+    // FIXME: backward compatibility introduced in v2.1.0
+    if (files.length === 0) files = videoFiles
+
+    if (!segmentsSha256UrlObject) {
+      logger.warn('No segment sha256 URL found in AP playlist object.', { playlistUrl: playlistUrlObject })
+      continue
+    }
+
+    const attribute = {
+      type: VideoStreamingPlaylistType.HLS,
+      playlistUrl: playlistUrlObject.href,
+      segmentsSha256Url: segmentsSha256UrlObject.href,
+      p2pMediaLoaderInfohashes: VideoStreamingPlaylistModel.buildP2PMediaLoaderInfoHashes(playlistUrlObject.href, files),
+      p2pMediaLoaderPeerVersion: P2P_MEDIA_LOADER_PEER_VERSION,
+      videoId: video.id,
+      tagAPObject: playlistUrlObject.tag
+    }
+
+    attributes.push(attribute)
+  }
+
+  return attributes
+}
+
+function videoActivityObjectToDBAttributes (videoChannel: MChannelId, videoObject: VideoObject, to: string[] = []) {
+  const privacy = to.includes(ACTIVITY_PUB.PUBLIC)
+    ? VideoPrivacy.PUBLIC
+    : VideoPrivacy.UNLISTED
+
+  const duration = videoObject.duration.replace(/[^\d]+/, '')
+  const language = videoObject.language?.identifier
+
+  const category = videoObject.category
+    ? parseInt(videoObject.category.identifier, 10)
+    : undefined
+
+  const licence = videoObject.licence
+    ? parseInt(videoObject.licence.identifier, 10)
+    : undefined
+
+  const description = videoObject.content || null
+  const support = videoObject.support || null
+
+  return {
+    name: videoObject.name,
+    uuid: videoObject.uuid,
+    url: videoObject.id,
+    category,
+    licence,
+    language,
+    description,
+    support,
+    nsfw: videoObject.sensitive,
+    commentsEnabled: videoObject.commentsEnabled,
+    downloadEnabled: videoObject.downloadEnabled,
+    waitTranscoding: videoObject.waitTranscoding,
+    isLive: videoObject.isLiveBroadcast,
+    state: videoObject.state,
+    channelId: videoChannel.id,
+    duration: parseInt(duration, 10),
+    createdAt: new Date(videoObject.published),
+    publishedAt: new Date(videoObject.published),
+
+    originallyPublishedAt: videoObject.originallyPublishedAt
+      ? new Date(videoObject.originallyPublishedAt)
+      : null,
+
+    updatedAt: new Date(videoObject.updated),
+    views: videoObject.views,
+    likes: 0,
+    dislikes: 0,
+    remote: true,
+    privacy
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  getThumbnailFromIcons,
+  getPreviewFromIcons,
+
+  getTagsFromObject,
+
+  videoActivityObjectToDBAttributes,
+
+  videoFileActivityUrlToDBAttributes,
+  streamingPlaylistActivityUrlToDBAttributes
+}
+
+// ---------------------------------------------------------------------------
+
+function isAPVideoUrlObject (url: any): url is ActivityVideoUrlObject {
+  const urlMediaType = url.mediaType
+
+  return MIMETYPES.VIDEO.MIMETYPE_EXT[urlMediaType] && urlMediaType.startsWith('video/')
+}
+
+function isAPStreamingPlaylistUrlObject (url: any): url is ActivityPlaylistUrlObject {
+  return url && url.mediaType === 'application/x-mpegURL'
+}
+
+function isAPPlaylistSegmentHashesUrlObject (tag: any): tag is ActivityPlaylistSegmentHashesObject {
+  return tag && tag.name === 'sha256' && tag.type === 'Link' && tag.mediaType === 'application/json'
+}
+
+function isAPMagnetUrlObject (url: any): url is ActivityMagnetUrlObject {
+  return url && url.mediaType === 'application/x-bittorrent;x-scheme-handler/magnet'
+}
+
+function isAPHashTagObject (url: any): url is ActivityHashTagObject {
+  return url && url.type === 'Hashtag'
+}
diff --git a/server/lib/activitypub/videos/shared/trackers.ts b/server/lib/activitypub/videos/shared/trackers.ts
new file mode 100644
index 000000000..fcb2a5091
--- /dev/null
+++ b/server/lib/activitypub/videos/shared/trackers.ts
@@ -0,0 +1,43 @@
+import { Transaction } from 'sequelize/types'
+import { buildRemoteVideoBaseUrl } from '@server/helpers/activitypub'
+import { isAPVideoTrackerUrlObject } from '@server/helpers/custom-validators/activitypub/videos'
+import { isArray } from '@server/helpers/custom-validators/misc'
+import { REMOTE_SCHEME } from '@server/initializers/constants'
+import { TrackerModel } from '@server/models/server/tracker'
+import { MVideo, MVideoWithHost } from '@server/types/models'
+import { ActivityTrackerUrlObject, VideoObject } from '@shared/models'
+
+function getTrackerUrls (object: VideoObject, video: MVideoWithHost) {
+  let wsFound = false
+
+  const trackers = object.url.filter(u => isAPVideoTrackerUrlObject(u))
+    .map((u: ActivityTrackerUrlObject) => {
+      if (isArray(u.rel) && u.rel.includes('websocket')) wsFound = true
+
+      return u.href
+    })
+
+  if (wsFound) return trackers
+
+  return [
+    buildRemoteVideoBaseUrl(video, '/tracker/socket', REMOTE_SCHEME.WS),
+    buildRemoteVideoBaseUrl(video, '/tracker/announce')
+  ]
+}
+
+async function setVideoTrackers (options: {
+  video: MVideo
+  trackers: string[]
+  transaction?: Transaction
+}) {
+  const { video, trackers, transaction } = options
+
+  const trackerInstances = await TrackerModel.findOrCreateTrackers(trackers, transaction)
+
+  await video.$set('Trackers', trackerInstances, { transaction })
+}
+
+export {
+  getTrackerUrls,
+  setVideoTrackers
+}
diff --git a/server/lib/activitypub/videos/shared/video-create.ts b/server/lib/activitypub/videos/shared/video-create.ts
new file mode 100644
index 000000000..80cc2ab37
--- /dev/null
+++ b/server/lib/activitypub/videos/shared/video-create.ts
@@ -0,0 +1,167 @@
+import { logger } from '@server/helpers/logger'
+import { sequelizeTypescript } from '@server/initializers/database'
+import { createPlaceholderThumbnail, createVideoMiniatureFromUrl } from '@server/lib/thumbnail'
+import { setVideoTags } from '@server/lib/video'
+import { autoBlacklistVideoIfNeeded } from '@server/lib/video-blacklist'
+import { VideoModel } from '@server/models/video/video'
+import { VideoCaptionModel } from '@server/models/video/video-caption'
+import { VideoFileModel } from '@server/models/video/video-file'
+import { VideoLiveModel } from '@server/models/video/video-live'
+import { VideoStreamingPlaylistModel } from '@server/models/video/video-streaming-playlist'
+import {
+  MChannelAccountLight,
+  MStreamingPlaylistFilesVideo,
+  MThumbnail,
+  MVideoCaption,
+  MVideoFullLight,
+  MVideoThumbnail
+} from '@server/types/models'
+import { ThumbnailType, VideoObject } from '@shared/models'
+import {
+  getPreviewFromIcons,
+  getTagsFromObject,
+  getThumbnailFromIcons,
+  streamingPlaylistActivityUrlToDBAttributes,
+  videoActivityObjectToDBAttributes,
+  videoFileActivityUrlToDBAttributes
+} from './object-to-model-attributes'
+import { getTrackerUrls, setVideoTrackers } from './trackers'
+
+async function createVideo (videoObject: VideoObject, channel: MChannelAccountLight, waitThumbnail = false) {
+  logger.debug('Adding remote video %s.', videoObject.id)
+
+  const videoData = await videoActivityObjectToDBAttributes(channel, videoObject, videoObject.to)
+  const video = VideoModel.build(videoData) as MVideoThumbnail
+
+  const promiseThumbnail = createVideoMiniatureFromUrl({
+    downloadUrl: getThumbnailFromIcons(videoObject).url,
+    video,
+    type: ThumbnailType.MINIATURE
+  }).catch(err => {
+    logger.error('Cannot create miniature from url.', { err })
+    return undefined
+  })
+
+  let thumbnailModel: MThumbnail
+  if (waitThumbnail === true) {
+    thumbnailModel = await promiseThumbnail
+  }
+
+  const { autoBlacklisted, videoCreated } = await sequelizeTypescript.transaction(async t => {
+    try {
+      const sequelizeOptions = { transaction: t }
+
+      const videoCreated = await video.save(sequelizeOptions) as MVideoFullLight
+      videoCreated.VideoChannel = channel
+
+      if (thumbnailModel) await videoCreated.addAndSaveThumbnail(thumbnailModel, t)
+
+      const previewIcon = getPreviewFromIcons(videoObject)
+      if (previewIcon) {
+        const previewModel = createPlaceholderThumbnail({
+          fileUrl: previewIcon.url,
+          video: videoCreated,
+          type: ThumbnailType.PREVIEW,
+          size: previewIcon
+        })
+
+        await videoCreated.addAndSaveThumbnail(previewModel, t)
+      }
+
+      // Process files
+      const videoFileAttributes = videoFileActivityUrlToDBAttributes(videoCreated, videoObject.url)
+
+      const videoFilePromises = videoFileAttributes.map(f => VideoFileModel.create(f, { transaction: t }))
+      const videoFiles = await Promise.all(videoFilePromises)
+
+      const streamingPlaylistsAttributes = streamingPlaylistActivityUrlToDBAttributes(videoCreated, videoObject, videoFiles)
+      videoCreated.VideoStreamingPlaylists = []
+
+      for (const playlistAttributes of streamingPlaylistsAttributes) {
+        const playlist = await VideoStreamingPlaylistModel.create(playlistAttributes, { transaction: t }) as MStreamingPlaylistFilesVideo
+        playlist.Video = videoCreated
+
+        const playlistFiles = videoFileActivityUrlToDBAttributes(playlist, playlistAttributes.tagAPObject)
+        const videoFilePromises = playlistFiles.map(f => VideoFileModel.create(f, { transaction: t }))
+        playlist.VideoFiles = await Promise.all(videoFilePromises)
+
+        videoCreated.VideoStreamingPlaylists.push(playlist)
+      }
+
+      // Process tags
+      const tags = getTagsFromObject(videoObject)
+      await setVideoTags({ video: videoCreated, tags, transaction: t })
+
+      // Process captions
+      const videoCaptionsPromises = videoObject.subtitleLanguage.map(c => {
+        const caption = new VideoCaptionModel({
+          videoId: videoCreated.id,
+          filename: VideoCaptionModel.generateCaptionName(c.identifier),
+          language: c.identifier,
+          fileUrl: c.url
+        }) as MVideoCaption
+
+        return VideoCaptionModel.insertOrReplaceLanguage(caption, t)
+      })
+      await Promise.all(videoCaptionsPromises)
+
+      // Process trackers
+      {
+        const trackers = getTrackerUrls(videoObject, videoCreated)
+        await setVideoTrackers({ video: videoCreated, trackers, transaction: t })
+      }
+
+      videoCreated.VideoFiles = videoFiles
+
+      if (videoCreated.isLive) {
+        const videoLive = new VideoLiveModel({
+          streamKey: null,
+          saveReplay: videoObject.liveSaveReplay,
+          permanentLive: videoObject.permanentLive,
+          videoId: videoCreated.id
+        })
+
+        videoCreated.VideoLive = await videoLive.save({ transaction: t })
+      }
+
+      // We added a video in this channel, set it as updated
+      await channel.setAsUpdated(t)
+
+      const autoBlacklisted = await autoBlacklistVideoIfNeeded({
+        video: videoCreated,
+        user: undefined,
+        isRemote: true,
+        isNew: true,
+        transaction: t
+      })
+
+      logger.info('Remote video with uuid %s inserted.', videoObject.uuid)
+
+      return { autoBlacklisted, videoCreated }
+    } catch (err) {
+      // FIXME: Use rollback hook when https://github.com/sequelize/sequelize/pull/13038 is released
+      // Remove thumbnail
+      if (thumbnailModel) await thumbnailModel.removeThumbnail()
+
+      throw err
+    }
+  })
+
+  if (waitThumbnail === false) {
+    // Error is already caught above
+    // eslint-disable-next-line @typescript-eslint/no-floating-promises
+    promiseThumbnail.then(thumbnailModel => {
+      if (!thumbnailModel) return
+
+      thumbnailModel = videoCreated.id
+
+      return thumbnailModel.save()
+    })
+  }
+
+  return { autoBlacklisted, videoCreated }
+}
+
+export {
+  createVideo
+}
diff --git a/server/lib/activitypub/videos/shared/video-sync-attributes.ts b/server/lib/activitypub/videos/shared/video-sync-attributes.ts
new file mode 100644
index 000000000..181893c68
--- /dev/null
+++ b/server/lib/activitypub/videos/shared/video-sync-attributes.ts
@@ -0,0 +1,75 @@
+import { logger } from '@server/helpers/logger'
+import { JobQueue } from '@server/lib/job-queue'
+import { AccountVideoRateModel } from '@server/models/account/account-video-rate'
+import { VideoCommentModel } from '@server/models/video/video-comment'
+import { VideoShareModel } from '@server/models/video/video-share'
+import { MVideo } from '@server/types/models'
+import { ActivitypubHttpFetcherPayload, VideoObject } from '@shared/models'
+import { crawlCollectionPage } from '../../crawl'
+import { addVideoShares } from '../../share'
+import { addVideoComments } from '../../video-comments'
+import { createRates } from '../../video-rates'
+
+import Bluebird = require('bluebird')
+
+type SyncParam = {
+  likes: boolean
+  dislikes: boolean
+  shares: boolean
+  comments: boolean
+  thumbnail: boolean
+  refreshVideo?: boolean
+}
+
+async function syncVideoExternalAttributes (video: MVideo, fetchedVideo: VideoObject, syncParam: SyncParam) {
+  logger.info('Adding likes/dislikes/shares/comments of video %s.', video.uuid)
+
+  const jobPayloads: ActivitypubHttpFetcherPayload[] = []
+
+  if (syncParam.likes === true) {
+    const handler = items => createRates(items, video, 'like')
+    const cleaner = crawlStartDate => AccountVideoRateModel.cleanOldRatesOf(video.id, 'like' as 'like', crawlStartDate)
+
+    await crawlCollectionPage<string>(fetchedVideo.likes, handler, cleaner)
+      .catch(err => logger.error('Cannot add likes of video %s.', video.uuid, { err, rootUrl: fetchedVideo.likes }))
+  } else {
+    jobPayloads.push({ uri: fetchedVideo.likes, videoId: video.id, type: 'video-likes' as 'video-likes' })
+  }
+
+  if (syncParam.dislikes === true) {
+    const handler = items => createRates(items, video, 'dislike')
+    const cleaner = crawlStartDate => AccountVideoRateModel.cleanOldRatesOf(video.id, 'dislike' as 'dislike', crawlStartDate)
+
+    await crawlCollectionPage<string>(fetchedVideo.dislikes, handler, cleaner)
+      .catch(err => logger.error('Cannot add dislikes of video %s.', video.uuid, { err, rootUrl: fetchedVideo.dislikes }))
+  } else {
+    jobPayloads.push({ uri: fetchedVideo.dislikes, videoId: video.id, type: 'video-dislikes' as 'video-dislikes' })
+  }
+
+  if (syncParam.shares === true) {
+    const handler = items => addVideoShares(items, video)
+    const cleaner = crawlStartDate => VideoShareModel.cleanOldSharesOf(video.id, crawlStartDate)
+
+    await crawlCollectionPage<string>(fetchedVideo.shares, handler, cleaner)
+      .catch(err => logger.error('Cannot add shares of video %s.', video.uuid, { err, rootUrl: fetchedVideo.shares }))
+  } else {
+    jobPayloads.push({ uri: fetchedVideo.shares, videoId: video.id, type: 'video-shares' as 'video-shares' })
+  }
+
+  if (syncParam.comments === true) {
+    const handler = items => addVideoComments(items)
+    const cleaner = crawlStartDate => VideoCommentModel.cleanOldCommentsOf(video.id, crawlStartDate)
+
+    await crawlCollectionPage<string>(fetchedVideo.comments, handler, cleaner)
+      .catch(err => logger.error('Cannot add comments of video %s.', video.uuid, { err, rootUrl: fetchedVideo.comments }))
+  } else {
+    jobPayloads.push({ uri: fetchedVideo.comments, videoId: video.id, type: 'video-comments' as 'video-comments' })
+  }
+
+  await Bluebird.map(jobPayloads, payload => JobQueue.Instance.createJobWithPromise({ type: 'activitypub-http-fetcher', payload }))
+}
+
+export {
+  SyncParam,
+  syncVideoExternalAttributes
+}
diff --git a/server/lib/activitypub/videos/update.ts b/server/lib/activitypub/videos/update.ts
new file mode 100644
index 000000000..444b51628
--- /dev/null
+++ b/server/lib/activitypub/videos/update.ts
@@ -0,0 +1,293 @@
+import { Transaction } from 'sequelize/types'
+import { deleteNonExistingModels, resetSequelizeInstance } from '@server/helpers/database-utils'
+import { logger } from '@server/helpers/logger'
+import { sequelizeTypescript } from '@server/initializers/database'
+import { Notifier } from '@server/lib/notifier'
+import { PeerTubeSocket } from '@server/lib/peertube-socket'
+import { createPlaceholderThumbnail, createVideoMiniatureFromUrl } from '@server/lib/thumbnail'
+import { setVideoTags } from '@server/lib/video'
+import { autoBlacklistVideoIfNeeded } from '@server/lib/video-blacklist'
+import { VideoCaptionModel } from '@server/models/video/video-caption'
+import { VideoFileModel } from '@server/models/video/video-file'
+import { VideoLiveModel } from '@server/models/video/video-live'
+import { VideoStreamingPlaylistModel } from '@server/models/video/video-streaming-playlist'
+import {
+  MChannelAccountLight,
+  MChannelDefault,
+  MStreamingPlaylistFilesVideo,
+  MThumbnail,
+  MVideoAccountLightBlacklistAllFiles,
+  MVideoCaption,
+  MVideoFile,
+  MVideoFullLight
+} from '@server/types/models'
+import { ThumbnailType, VideoObject, VideoPrivacy } from '@shared/models'
+import {
+  getPreviewFromIcons,
+  getTagsFromObject,
+  getThumbnailFromIcons,
+  getTrackerUrls,
+  setVideoTrackers,
+  streamingPlaylistActivityUrlToDBAttributes,
+  videoActivityObjectToDBAttributes,
+  videoFileActivityUrlToDBAttributes
+} from './shared'
+
+export class APVideoUpdater {
+  private readonly video: MVideoAccountLightBlacklistAllFiles
+  private readonly videoObject: VideoObject
+  private readonly channel: MChannelDefault
+  private readonly overrideTo: string[]
+
+  private readonly wasPrivateVideo: boolean
+  private readonly wasUnlistedVideo: boolean
+
+  private readonly videoFieldsSave: any
+
+  private readonly oldVideoChannel: MChannelAccountLight
+
+  constructor (options: {
+    video: MVideoAccountLightBlacklistAllFiles
+    videoObject: VideoObject
+    channel: MChannelDefault
+    overrideTo?: string[]
+  }) {
+    this.video = options.video
+    this.videoObject = options.videoObject
+    this.channel = options.channel
+    this.overrideTo = options.overrideTo
+
+    this.wasPrivateVideo = this.video.privacy === VideoPrivacy.PRIVATE
+    this.wasUnlistedVideo = this.video.privacy === VideoPrivacy.UNLISTED
+
+    this.oldVideoChannel = this.video.VideoChannel
+
+    this.videoFieldsSave = this.video.toJSON()
+  }
+
+  async update () {
+    logger.debug('Updating remote video "%s".', this.videoObject.uuid, { videoObject: this.videoObject, channel: this.channel })
+
+    try {
+      const thumbnailModel = await this.tryToGenerateThumbnail()
+
+      const videoUpdated = await sequelizeTypescript.transaction(async t => {
+        this.checkChannelUpdateOrThrow()
+
+        const videoUpdated = await this.updateVideo(t)
+
+        await this.processIcons(videoUpdated, thumbnailModel, t)
+        await this.processWebTorrentFiles(videoUpdated, t)
+        await this.processStreamingPlaylists(videoUpdated, t)
+        await this.processTags(videoUpdated, t)
+        await this.processTrackers(videoUpdated, t)
+        await this.processCaptions(videoUpdated, t)
+        await this.processLive(videoUpdated, t)
+
+        return videoUpdated
+      })
+
+      await autoBlacklistVideoIfNeeded({
+        video: videoUpdated,
+        user: undefined,
+        isRemote: true,
+        isNew: false,
+        transaction: undefined
+      })
+
+      // Notify our users?
+      if (this.wasPrivateVideo || this.wasUnlistedVideo) {
+        Notifier.Instance.notifyOnNewVideoIfNeeded(videoUpdated)
+      }
+
+      if (videoUpdated.isLive) {
+        PeerTubeSocket.Instance.sendVideoLiveNewState(videoUpdated)
+        PeerTubeSocket.Instance.sendVideoViewsUpdate(videoUpdated)
+      }
+
+      logger.info('Remote video with uuid %s updated', this.videoObject.uuid)
+
+      return videoUpdated
+    } catch (err) {
+      this.catchUpdateError(err)
+    }
+  }
+
+  private tryToGenerateThumbnail (): Promise<MThumbnail> {
+    return createVideoMiniatureFromUrl({
+      downloadUrl: getThumbnailFromIcons(this.videoObject).url,
+      video: this.video,
+      type: ThumbnailType.MINIATURE
+    }).catch(err => {
+      logger.warn('Cannot generate thumbnail of %s.', this.videoObject.id, { err })
+
+      return undefined
+    })
+  }
+
+  // Check we can update the channel: we trust the remote server
+  private checkChannelUpdateOrThrow () {
+    if (!this.oldVideoChannel.Actor.serverId || !this.channel.Actor.serverId) {
+      throw new Error('Cannot check old channel/new channel validity because `serverId` is null')
+    }
+
+    if (this.oldVideoChannel.Actor.serverId !== this.channel.Actor.serverId) {
+      throw new Error(`New channel ${this.channel.Actor.url} is not on the same server than new channel ${this.oldVideoChannel.Actor.url}`)
+    }
+  }
+
+  private updateVideo (transaction: Transaction) {
+    const to = this.overrideTo || this.videoObject.to
+    const videoData = videoActivityObjectToDBAttributes(this.channel, this.videoObject, to)
+    this.video.name = videoData.name
+    this.video.uuid = videoData.uuid
+    this.video.url = videoData.url
+    this.video.category = videoData.category
+    this.video.licence = videoData.licence
+    this.video.language = videoData.language
+    this.video.description = videoData.description
+    this.video.support = videoData.support
+    this.video.nsfw = videoData.nsfw
+    this.video.commentsEnabled = videoData.commentsEnabled
+    this.video.downloadEnabled = videoData.downloadEnabled
+    this.video.waitTranscoding = videoData.waitTranscoding
+    this.video.state = videoData.state
+    this.video.duration = videoData.duration
+    this.video.createdAt = videoData.createdAt
+    this.video.publishedAt = videoData.publishedAt
+    this.video.originallyPublishedAt = videoData.originallyPublishedAt
+    this.video.privacy = videoData.privacy
+    this.video.channelId = videoData.channelId
+    this.video.views = videoData.views
+    this.video.isLive = videoData.isLive
+
+    // Ensures we update the updated video attribute
+    this.video.changed('updatedAt', true)
+
+    return this.video.save({ transaction }) as Promise<MVideoFullLight>
+  }
+
+  private async processIcons (videoUpdated: MVideoFullLight, thumbnailModel: MThumbnail, t: Transaction) {
+    if (thumbnailModel) await videoUpdated.addAndSaveThumbnail(thumbnailModel, t)
+
+    // Don't fetch the preview that could be big, create a placeholder instead
+    const previewIcon = getPreviewFromIcons(this.videoObject)
+    if (videoUpdated.getPreview() && previewIcon) {
+      const previewModel = createPlaceholderThumbnail({
+        fileUrl: previewIcon.url,
+        video: videoUpdated,
+        type: ThumbnailType.PREVIEW,
+        size: previewIcon
+      })
+      await videoUpdated.addAndSaveThumbnail(previewModel, t)
+    }
+  }
+
+  private async processWebTorrentFiles (videoUpdated: MVideoFullLight, t: Transaction) {
+    const videoFileAttributes = videoFileActivityUrlToDBAttributes(videoUpdated, this.videoObject.url)
+    const newVideoFiles = videoFileAttributes.map(a => new VideoFileModel(a))
+
+    // Remove video files that do not exist anymore
+    const destroyTasks = deleteNonExistingModels(videoUpdated.VideoFiles, newVideoFiles, t)
+    await Promise.all(destroyTasks)
+
+    // Update or add other one
+    const upsertTasks = newVideoFiles.map(f => VideoFileModel.customUpsert(f, 'video', t))
+    videoUpdated.VideoFiles = await Promise.all(upsertTasks)
+  }
+
+  private async processStreamingPlaylists (videoUpdated: MVideoFullLight, t: Transaction) {
+    const streamingPlaylistAttributes = streamingPlaylistActivityUrlToDBAttributes(videoUpdated, this.videoObject, videoUpdated.VideoFiles)
+    const newStreamingPlaylists = streamingPlaylistAttributes.map(a => new VideoStreamingPlaylistModel(a))
+
+    // Remove video playlists that do not exist anymore
+    const destroyTasks = deleteNonExistingModels(videoUpdated.VideoStreamingPlaylists, newStreamingPlaylists, t)
+    await Promise.all(destroyTasks)
+
+    let oldStreamingPlaylistFiles: MVideoFile[] = []
+    for (const videoStreamingPlaylist of videoUpdated.VideoStreamingPlaylists) {
+      oldStreamingPlaylistFiles = oldStreamingPlaylistFiles.concat(videoStreamingPlaylist.VideoFiles)
+    }
+
+    videoUpdated.VideoStreamingPlaylists = []
+
+    for (const playlistAttributes of streamingPlaylistAttributes) {
+      const streamingPlaylistModel = await VideoStreamingPlaylistModel.upsert(playlistAttributes, { returning: true, transaction: t })
+                                 .then(([ streamingPlaylist ]) => streamingPlaylist as MStreamingPlaylistFilesVideo)
+      streamingPlaylistModel.Video = videoUpdated
+
+      const newVideoFiles: MVideoFile[] = videoFileActivityUrlToDBAttributes(streamingPlaylistModel, playlistAttributes.tagAPObject)
+        .map(a => new VideoFileModel(a))
+      const destroyTasks = deleteNonExistingModels(oldStreamingPlaylistFiles, newVideoFiles, t)
+      await Promise.all(destroyTasks)
+
+      // Update or add other one
+      const upsertTasks = newVideoFiles.map(f => VideoFileModel.customUpsert(f, 'streaming-playlist', t))
+      streamingPlaylistModel.VideoFiles = await Promise.all(upsertTasks)
+
+      videoUpdated.VideoStreamingPlaylists.push(streamingPlaylistModel)
+    }
+  }
+
+  private async processTags (videoUpdated: MVideoFullLight, t: Transaction) {
+    const tags = getTagsFromObject(this.videoObject)
+    await setVideoTags({ video: videoUpdated, tags, transaction: t })
+  }
+
+  private async processTrackers (videoUpdated: MVideoFullLight, t: Transaction) {
+    const trackers = getTrackerUrls(this.videoObject, videoUpdated)
+    await setVideoTrackers({ video: videoUpdated, trackers, transaction: t })
+  }
+
+  private async processCaptions (videoUpdated: MVideoFullLight, t: Transaction) {
+    // Update captions
+    await VideoCaptionModel.deleteAllCaptionsOfRemoteVideo(videoUpdated.id, t)
+
+    const videoCaptionsPromises = this.videoObject.subtitleLanguage.map(c => {
+      const caption = new VideoCaptionModel({
+        videoId: videoUpdated.id,
+        filename: VideoCaptionModel.generateCaptionName(c.identifier),
+        language: c.identifier,
+        fileUrl: c.url
+      }) as MVideoCaption
+
+      return VideoCaptionModel.insertOrReplaceLanguage(caption, t)
+    })
+
+    await Promise.all(videoCaptionsPromises)
+  }
+
+  private async processLive (videoUpdated: MVideoFullLight, t: Transaction) {
+    // Create or update existing live
+    if (this.video.isLive) {
+      const [ videoLive ] = await VideoLiveModel.upsert({
+        saveReplay: this.videoObject.liveSaveReplay,
+        permanentLive: this.videoObject.permanentLive,
+        videoId: this.video.id
+      }, { transaction: t, returning: true })
+
+      videoUpdated.VideoLive = videoLive
+      return
+    }
+
+    // Delete existing live if it exists
+    await VideoLiveModel.destroy({
+      where: {
+        videoId: this.video.id
+      },
+      transaction: t
+    })
+
+    videoUpdated.VideoLive = null
+  }
+
+  private catchUpdateError (err: Error) {
+    if (this.video !== undefined && this.videoFieldsSave !== undefined) {
+      resetSequelizeInstance(this.video, this.videoFieldsSave)
+    }
+
+    // This is just a debug because we will retry the insert
+    logger.debug('Cannot update the remote video.', { err })
+    throw err
+  }
+}