5 files changed, 754 insertions, 99 deletions

diff --git a/server/models/video/video-channel.ts b/server/models/video/video-channel.ts
index 2426b3de6..112abf8cf 100644
--- a/server/models/video/video-channel.ts
+++ b/server/models/video/video-channel.ts
@@ -8,7 +8,7 @@ import {
   Default,
   DefaultScope,
   ForeignKey,
-  HasMany,
+  HasMany, IFindOptions,
   Is,
   Model,
   Scopes,
@@ -17,20 +17,22 @@ import {
   UpdatedAt
 } from 'sequelize-typescript'
 import { ActivityPubActor } from '../../../shared/models/activitypub'
-import { VideoChannel } from '../../../shared/models/videos'
+import { VideoChannel, VideoChannelSummary } from '../../../shared/models/videos'
 import {
   isVideoChannelDescriptionValid,
   isVideoChannelNameValid,
   isVideoChannelSupportValid
 } from '../../helpers/custom-validators/video-channels'
 import { sendDeleteActor } from '../../lib/activitypub/send'
-import { AccountModel } from '../account/account'
+import { AccountModel, ScopeNames as AccountModelScopeNames } from '../account/account'
 import { ActorModel, unusedActorAttributesForAPI } from '../activitypub/actor'
-import { buildTrigramSearchIndex, createSimilarityAttribute, getSort, throwIfNotValid } from '../utils'
+import { buildServerIdsFollowedBy, buildTrigramSearchIndex, createSimilarityAttribute, getSort, throwIfNotValid } from '../utils'
 import { VideoModel } from './video'
 import { CONFIG, CONSTRAINTS_FIELDS } from '../../initializers'
 import { ServerModel } from '../server/server'
 import { DefineIndexesOptions } from 'sequelize'
+import { AvatarModel } from '../avatar/avatar'
+import { VideoPlaylistModel } from './video-playlist'
 
 // FIXME: Define indexes here because there is an issue with TS and Sequelize.literal when called directly in the annotation
 const indexes: DefineIndexesOptions[] = [
@@ -44,11 +46,12 @@ const indexes: DefineIndexesOptions[] = [
   }
 ]
 
-enum ScopeNames {
+export enum ScopeNames {
   AVAILABLE_FOR_LIST = 'AVAILABLE_FOR_LIST',
   WITH_ACCOUNT = 'WITH_ACCOUNT',
   WITH_ACTOR = 'WITH_ACTOR',
-  WITH_VIDEOS = 'WITH_VIDEOS'
+  WITH_VIDEOS = 'WITH_VIDEOS',
+  SUMMARY = 'SUMMARY'
 }
 
 type AvailableForListOptions = {
@@ -64,15 +67,41 @@ type AvailableForListOptions = {
   ]
 })
 @Scopes({
-  [ScopeNames.AVAILABLE_FOR_LIST]: (options: AvailableForListOptions) => {
-    const actorIdNumber = parseInt(options.actorId + '', 10)
+  [ScopeNames.SUMMARY]: (required: boolean, withAccount: boolean) => {
+    const base: IFindOptions<VideoChannelModel> = {
+      attributes: [ 'name', 'description', 'id' ],
+      include: [
+        {
+          attributes: [ 'uuid', 'preferredUsername', 'url', 'serverId', 'avatarId' ],
+          model: ActorModel.unscoped(),
+          required: true,
+          include: [
+            {
+              attributes: [ 'host' ],
+              model: ServerModel.unscoped(),
+              required: false
+            },
+            {
+              model: AvatarModel.unscoped(),
+              required: false
+            }
+          ]
+        }
+      ]
+    }
+
+    if (withAccount === true) {
+      base.include.push({
+        model: AccountModel.scope(AccountModelScopeNames.SUMMARY),
+        required: true
+      })
+    }
 
+    return base
+  },
+  [ScopeNames.AVAILABLE_FOR_LIST]: (options: AvailableForListOptions) => {
     // Only list local channels OR channels that are on an instance followed by actorId
-    const inQueryInstanceFollow = '(' +
-      'SELECT "actor"."serverId" FROM "actorFollow" ' +
-      'INNER JOIN "actor" ON actor.id=  "actorFollow"."targetActorId" ' +
-      'WHERE "actorFollow"."actorId" = ' + actorIdNumber +
-    ')'
+    const inQueryInstanceFollow = buildServerIdsFollowedBy(options.actorId)
 
     return {
       include: [
@@ -192,6 +221,15 @@ export class VideoChannelModel extends Model<VideoChannelModel> {
   })
   Videos: VideoModel[]
 
+  @HasMany(() => VideoPlaylistModel, {
+    foreignKey: {
+      allowNull: false
+    },
+    onDelete: 'cascade',
+    hooks: true
+  })
+  VideoPlaylists: VideoPlaylistModel[]
+
   @BeforeDestroy
   static async sendDeleteIfOwned (instance: VideoChannelModel, options) {
     if (!instance.Actor) {
@@ -460,6 +498,20 @@ export class VideoChannelModel extends Model<VideoChannelModel> {
     return Object.assign(actor, videoChannel)
   }
 
+  toFormattedSummaryJSON (): VideoChannelSummary {
+    const actor = this.Actor.toFormattedJSON()
+
+    return {
+      id: this.id,
+      uuid: actor.uuid,
+      name: actor.name,
+      displayName: this.getDisplayName(),
+      url: actor.url,
+      host: actor.host,
+      avatar: actor.avatar
+    }
+  }
+
   toActivityPubObject (): ActivityPubActor {
     const obj = this.Actor.toActivityPubObject(this.name, 'VideoChannel')
 
diff --git a/server/models/video/video-format-utils.ts b/server/models/video/video-format-utils.ts
index a62335333..dc10fb9a2 100644
--- a/server/models/video/video-format-utils.ts
+++ b/server/models/video/video-format-utils.ts
@@ -26,12 +26,10 @@ export type VideoFormattingJSONOptions = {
     waitTranscoding?: boolean,
     scheduledUpdate?: boolean,
     blacklistInfo?: boolean
+    playlistInfo?: boolean
   }
 }
 function videoModelToFormattedJSON (video: VideoModel, options?: VideoFormattingJSONOptions): Video {
-  const formattedAccount = video.VideoChannel.Account.toFormattedJSON()
-  const formattedVideoChannel = video.VideoChannel.toFormattedJSON()
-
   const userHistory = isArray(video.UserVideoHistories) ? video.UserVideoHistories[0] : undefined
 
   const videoObject: Video = {
@@ -68,24 +66,9 @@ function videoModelToFormattedJSON (video: VideoModel, options?: VideoFormatting
     updatedAt: video.updatedAt,
     publishedAt: video.publishedAt,
     originallyPublishedAt: video.originallyPublishedAt,
-    account: {
-      id: formattedAccount.id,
-      uuid: formattedAccount.uuid,
-      name: formattedAccount.name,
-      displayName: formattedAccount.displayName,
-      url: formattedAccount.url,
-      host: formattedAccount.host,
-      avatar: formattedAccount.avatar
-    },
-    channel: {
-      id: formattedVideoChannel.id,
-      uuid: formattedVideoChannel.uuid,
-      name: formattedVideoChannel.name,
-      displayName: formattedVideoChannel.displayName,
-      url: formattedVideoChannel.url,
-      host: formattedVideoChannel.host,
-      avatar: formattedVideoChannel.avatar
-    },
+
+    account: video.VideoChannel.Account.toFormattedSummaryJSON(),
+    channel: video.VideoChannel.toFormattedSummaryJSON(),
 
     userHistory: userHistory ? {
       currentTime: userHistory.currentTime
@@ -115,6 +98,17 @@ function videoModelToFormattedJSON (video: VideoModel, options?: VideoFormatting
       videoObject.blacklisted = !!video.VideoBlacklist
       videoObject.blacklistedReason = video.VideoBlacklist ? video.VideoBlacklist.reason : null
     }
+
+    if (options.additionalAttributes.playlistInfo === true) {
+      // We filtered on a specific videoId/videoPlaylistId, that is unique
+      const playlistElement = video.VideoPlaylistElements[0]
+
+      videoObject.playlistElement = {
+        position: playlistElement.position,
+        startTimestamp: playlistElement.startTimestamp,
+        stopTimestamp: playlistElement.stopTimestamp
+      }
+    }
   }
 
   return videoObject
diff --git a/server/models/video/video-playlist-element.ts b/server/models/video/video-playlist-element.ts
new file mode 100644
index 000000000..d76149d12
--- /dev/null
+++ b/server/models/video/video-playlist-element.ts
@@ -0,0 +1,231 @@
+import {
+  AllowNull,
+  BelongsTo,
+  Column,
+  CreatedAt,
+  DataType,
+  Default,
+  ForeignKey,
+  Is,
+  IsInt,
+  Min,
+  Model,
+  Table,
+  UpdatedAt
+} from 'sequelize-typescript'
+import { VideoModel } from './video'
+import { VideoPlaylistModel } from './video-playlist'
+import * as Sequelize from 'sequelize'
+import { getSort, throwIfNotValid } from '../utils'
+import { isActivityPubUrlValid } from '../../helpers/custom-validators/activitypub/misc'
+import { CONSTRAINTS_FIELDS } from '../../initializers'
+import { PlaylistElementObject } from '../../../shared/models/activitypub/objects/playlist-element-object'
+
+@Table({
+  tableName: 'videoPlaylistElement',
+  indexes: [
+    {
+      fields: [ 'videoPlaylistId' ]
+    },
+    {
+      fields: [ 'videoId' ]
+    },
+    {
+      fields: [ 'videoPlaylistId', 'videoId' ],
+      unique: true
+    },
+    {
+      fields: [ 'videoPlaylistId', 'position' ],
+      unique: true
+    },
+    {
+      fields: [ 'url' ],
+      unique: true
+    }
+  ]
+})
+export class VideoPlaylistElementModel extends Model<VideoPlaylistElementModel> {
+  @CreatedAt
+  createdAt: Date
+
+  @UpdatedAt
+  updatedAt: Date
+
+  @AllowNull(false)
+  @Is('VideoPlaylistUrl', value => throwIfNotValid(value, isActivityPubUrlValid, 'url'))
+  @Column(DataType.STRING(CONSTRAINTS_FIELDS.VIDEO_PLAYLISTS.URL.max))
+  url: string
+
+  @AllowNull(false)
+  @Default(1)
+  @IsInt
+  @Min(1)
+  @Column
+  position: number
+
+  @AllowNull(true)
+  @IsInt
+  @Min(0)
+  @Column
+  startTimestamp: number
+
+  @AllowNull(true)
+  @IsInt
+  @Min(0)
+  @Column
+  stopTimestamp: number
+
+  @ForeignKey(() => VideoPlaylistModel)
+  @Column
+  videoPlaylistId: number
+
+  @BelongsTo(() => VideoPlaylistModel, {
+    foreignKey: {
+      allowNull: false
+    },
+    onDelete: 'CASCADE'
+  })
+  VideoPlaylist: VideoPlaylistModel
+
+  @ForeignKey(() => VideoModel)
+  @Column
+  videoId: number
+
+  @BelongsTo(() => VideoModel, {
+    foreignKey: {
+      allowNull: false
+    },
+    onDelete: 'CASCADE'
+  })
+  Video: VideoModel
+
+  static deleteAllOf (videoPlaylistId: number, transaction?: Sequelize.Transaction) {
+    const query = {
+      where: {
+        videoPlaylistId
+      },
+      transaction
+    }
+
+    return VideoPlaylistElementModel.destroy(query)
+  }
+
+  static loadByPlaylistAndVideo (videoPlaylistId: number, videoId: number) {
+    const query = {
+      where: {
+        videoPlaylistId,
+        videoId
+      }
+    }
+
+    return VideoPlaylistElementModel.findOne(query)
+  }
+
+  static loadByPlaylistAndVideoForAP (playlistId: number | string, videoId: number | string) {
+    const playlistWhere = validator.isUUID('' + playlistId) ? { uuid: playlistId } : { id: playlistId }
+    const videoWhere = validator.isUUID('' + videoId) ? { uuid: videoId } : { id: videoId }
+
+    const query = {
+      include: [
+        {
+          attributes: [ 'privacy' ],
+          model: VideoPlaylistModel.unscoped(),
+          where: playlistWhere
+        },
+        {
+          attributes: [ 'url' ],
+          model: VideoModel.unscoped(),
+          where: videoWhere
+        }
+      ]
+    }
+
+    return VideoPlaylistElementModel.findOne(query)
+  }
+
+  static listUrlsOfForAP (videoPlaylistId: number, start: number, count: number) {
+    const query = {
+      attributes: [ 'url' ],
+      offset: start,
+      limit: count,
+      order: getSort('position'),
+      where: {
+        videoPlaylistId
+      }
+    }
+
+    return VideoPlaylistElementModel
+      .findAndCountAll(query)
+      .then(({ rows, count }) => {
+        return { total: count, data: rows.map(e => e.url) }
+      })
+  }
+
+  static getNextPositionOf (videoPlaylistId: number, transaction?: Sequelize.Transaction) {
+    const query = {
+      where: {
+        videoPlaylistId
+      },
+      transaction
+    }
+
+    return VideoPlaylistElementModel.max('position', query)
+      .then(position => position ? position + 1 : 1)
+  }
+
+  static reassignPositionOf (
+    videoPlaylistId: number,
+    firstPosition: number,
+    endPosition: number,
+    newPosition: number,
+    transaction?: Sequelize.Transaction
+  ) {
+    const query = {
+      where: {
+        videoPlaylistId,
+        position: {
+          [Sequelize.Op.gte]: firstPosition,
+          [Sequelize.Op.lte]: endPosition
+        }
+      },
+      transaction
+    }
+
+    return VideoPlaylistElementModel.update({ position: Sequelize.literal(`${newPosition} + "position" - ${firstPosition}`) }, query)
+  }
+
+  static increasePositionOf (
+    videoPlaylistId: number,
+    fromPosition: number,
+    toPosition?: number,
+    by = 1,
+    transaction?: Sequelize.Transaction
+  ) {
+    const query = {
+      where: {
+        videoPlaylistId,
+        position: {
+          [Sequelize.Op.gte]: fromPosition
+        }
+      },
+      transaction
+    }
+
+    return VideoPlaylistElementModel.increment({ position: by }, query)
+  }
+
+  toActivityPubObject (): PlaylistElementObject {
+    const base: PlaylistElementObject = {
+      id: this.url,
+      type: 'PlaylistElement',
+
+      url: this.Video.url,
+      position: this.position
+    }
+
+    if (this.startTimestamp) base.startTimestamp = this.startTimestamp
+    if (this.stopTimestamp) base.stopTimestamp = this.stopTimestamp
+
+    return base
+  }
+}
diff --git a/server/models/video/video-playlist.ts b/server/models/video/video-playlist.ts
new file mode 100644
index 000000000..93b8c2f58
--- /dev/null
+++ b/server/models/video/video-playlist.ts
@@ -0,0 +1,381 @@
+import {
+  AllowNull,
+  BeforeDestroy,
+  BelongsTo,
+  Column,
+  CreatedAt,
+  DataType,
+  Default,
+  ForeignKey,
+  HasMany,
+  Is,
+  IsUUID,
+  Model,
+  Scopes,
+  Table,
+  UpdatedAt
+} from 'sequelize-typescript'
+import * as Sequelize from 'sequelize'
+import { VideoPlaylistPrivacy } from '../../../shared/models/videos/playlist/video-playlist-privacy.model'
+import { buildServerIdsFollowedBy, buildWhereIdOrUUID, getSort, throwIfNotValid } from '../utils'
+import {
+  isVideoPlaylistDescriptionValid,
+  isVideoPlaylistNameValid,
+  isVideoPlaylistPrivacyValid
+} from '../../helpers/custom-validators/video-playlists'
+import { isActivityPubUrlValid } from '../../helpers/custom-validators/activitypub/misc'
+import { CONFIG, CONSTRAINTS_FIELDS, STATIC_PATHS, THUMBNAILS_SIZE, VIDEO_PLAYLIST_PRIVACIES } from '../../initializers'
+import { VideoPlaylist } from '../../../shared/models/videos/playlist/video-playlist.model'
+import { AccountModel, ScopeNames as AccountScopeNames } from '../account/account'
+import { ScopeNames as VideoChannelScopeNames, VideoChannelModel } from './video-channel'
+import { join } from 'path'
+import { VideoPlaylistElementModel } from './video-playlist-element'
+import { PlaylistObject } from '../../../shared/models/activitypub/objects/playlist-object'
+import { activityPubCollectionPagination } from '../../helpers/activitypub'
+import { remove } from 'fs-extra'
+import { logger } from '../../helpers/logger'
+
+enum ScopeNames {
+  AVAILABLE_FOR_LIST = 'AVAILABLE_FOR_LIST',
+  WITH_VIDEOS_LENGTH = 'WITH_VIDEOS_LENGTH',
+  WITH_ACCOUNT_AND_CHANNEL = 'WITH_ACCOUNT_AND_CHANNEL'
+}
+
+type AvailableForListOptions = {
+  followerActorId: number
+  accountId?: number,
+  videoChannelId?: number
+  privateAndUnlisted?: boolean
+}
+
+@Scopes({
+  [ScopeNames.WITH_VIDEOS_LENGTH]: {
+    attributes: {
+      include: [
+        [
+          Sequelize.literal('(SELECT COUNT("id") FROM "videoPlaylistElement" WHERE "videoPlaylistId" = "VideoPlaylistModel"."id")'),
+          'videosLength'
+        ]
+      ]
+    }
+  },
+  [ScopeNames.WITH_ACCOUNT_AND_CHANNEL]: {
+    include: [
+      {
+        model: () => AccountModel.scope(AccountScopeNames.SUMMARY),
+        required: true
+      },
+      {
+        model: () => VideoChannelModel.scope(VideoChannelScopeNames.SUMMARY),
+        required: false
+      }
+    ]
+  },
+  [ScopeNames.AVAILABLE_FOR_LIST]: (options: AvailableForListOptions) => {
+    // Only list local playlists OR playlists that are on an instance followed by actorId
+    const inQueryInstanceFollow = buildServerIdsFollowedBy(options.followerActorId)
+    const actorWhere = {
+      [ Sequelize.Op.or ]: [
+        {
+          serverId: null
+        },
+        {
+          serverId: {
+            [ Sequelize.Op.in ]: Sequelize.literal(inQueryInstanceFollow)
+          }
+        }
+      ]
+    }
+
+    const whereAnd: any[] = []
+
+    if (options.privateAndUnlisted !== true) {
+      whereAnd.push({
+        privacy: VideoPlaylistPrivacy.PUBLIC
+      })
+    }
+
+    if (options.accountId) {
+      whereAnd.push({
+        ownerAccountId: options.accountId
+      })
+    }
+
+    if (options.videoChannelId) {
+      whereAnd.push({
+        videoChannelId: options.videoChannelId
+      })
+    }
+
+    const where = {
+      [Sequelize.Op.and]: whereAnd
+    }
+
+    const accountScope = {
+      method: [ AccountScopeNames.SUMMARY, actorWhere ]
+    }
+
+    return {
+      where,
+      include: [
+        {
+          model: AccountModel.scope(accountScope),
+          required: true
+        },
+        {
+          model: VideoChannelModel.scope(VideoChannelScopeNames.SUMMARY),
+          required: false
+        }
+      ]
+    }
+  }
+})
+
+@Table({
+  tableName: 'videoPlaylist',
+  indexes: [
+    {
+      fields: [ 'ownerAccountId' ]
+    },
+    {
+      fields: [ 'videoChannelId' ]
+    },
+    {
+      fields: [ 'url' ],
+      unique: true
+    }
+  ]
+})
+export class VideoPlaylistModel extends Model<VideoPlaylistModel> {
+  @CreatedAt
+  createdAt: Date
+
+  @UpdatedAt
+  updatedAt: Date
+
+  @AllowNull(false)
+  @Is('VideoPlaylistName', value => throwIfNotValid(value, isVideoPlaylistNameValid, 'name'))
+  @Column
+  name: string
+
+  @AllowNull(true)
+  @Is('VideoPlaylistDescription', value => throwIfNotValid(value, isVideoPlaylistDescriptionValid, 'description'))
+  @Column
+  description: string
+
+  @AllowNull(false)
+  @Is('VideoPlaylistPrivacy', value => throwIfNotValid(value, isVideoPlaylistPrivacyValid, 'privacy'))
+  @Column
+  privacy: VideoPlaylistPrivacy
+
+  @AllowNull(false)
+  @Is('VideoPlaylistUrl', value => throwIfNotValid(value, isActivityPubUrlValid, 'url'))
+  @Column(DataType.STRING(CONSTRAINTS_FIELDS.VIDEO_PLAYLISTS.URL.max))
+  url: string
+
+  @AllowNull(false)
+  @Default(DataType.UUIDV4)
+  @IsUUID(4)
+  @Column(DataType.UUID)
+  uuid: string
+
+  @ForeignKey(() => AccountModel)
+  @Column
+  ownerAccountId: number
+
+  @BelongsTo(() => AccountModel, {
+    foreignKey: {
+      allowNull: false
+    },
+    onDelete: 'CASCADE'
+  })
+  OwnerAccount: AccountModel
+
+  @ForeignKey(() => VideoChannelModel)
+  @Column
+  videoChannelId: number
+
+  @BelongsTo(() => VideoChannelModel, {
+    foreignKey: {
+      allowNull: false
+    },
+    onDelete: 'CASCADE'
+  })
+  VideoChannel: VideoChannelModel
+
+  @HasMany(() => VideoPlaylistElementModel, {
+    foreignKey: {
+      name: 'videoPlaylistId',
+      allowNull: false
+    },
+    onDelete: 'cascade'
+  })
+  VideoPlaylistElements: VideoPlaylistElementModel[]
+
+  // Calculated field
+  videosLength?: number
+
+  @BeforeDestroy
+  static async removeFiles (instance: VideoPlaylistModel) {
+    logger.info('Removing files of video playlist %s.', instance.url)
+
+    return instance.removeThumbnail()
+  }
+
+  static listForApi (options: {
+    followerActorId: number
+    start: number,
+    count: number,
+    sort: string,
+    accountId?: number,
+    videoChannelId?: number,
+    privateAndUnlisted?: boolean
+  }) {
+    const query = {
+      offset: options.start,
+      limit: options.count,
+      order: getSort(options.sort)
+    }
+
+    const scopes = [
+      {
+        method: [
+          ScopeNames.AVAILABLE_FOR_LIST,
+          {
+            followerActorId: options.followerActorId,
+            accountId: options.accountId,
+            videoChannelId: options.videoChannelId,
+            privateAndUnlisted: options.privateAndUnlisted
+          } as AvailableForListOptions
+        ]
+      } as any, // FIXME: typings
+      ScopeNames.WITH_VIDEOS_LENGTH
+    ]
+
+    return VideoPlaylistModel
+      .scope(scopes)
+      .findAndCountAll(query)
+      .then(({ rows, count }) => {
+        return { total: count, data: rows }
+      })
+  }
+
+  static listUrlsOfForAP (accountId: number, start: number, count: number) {
+    const query = {
+      attributes: [ 'url' ],
+      offset: start,
+      limit: count,
+      where: {
+        ownerAccountId: accountId
+      }
+    }
+
+    return VideoPlaylistModel.findAndCountAll(query)
+                             .then(({ rows, count }) => {
+                               return { total: count, data: rows.map(p => p.url) }
+                             })
+  }
+
+  static doesPlaylistExist (url: string) {
+    const query = {
+      attributes: [],
+      where: {
+        url
+      }
+    }
+
+    return VideoPlaylistModel
+      .findOne(query)
+      .then(e => !!e)
+  }
+
+  static load (id: number | string, transaction: Sequelize.Transaction) {
+    const where = buildWhereIdOrUUID(id)
+
+    const query = {
+      where,
+      transaction
+    }
+
+    return VideoPlaylistModel
+      .scope([ ScopeNames.WITH_ACCOUNT_AND_CHANNEL, ScopeNames.WITH_VIDEOS_LENGTH ])
+      .findOne(query)
+  }
+
+  static getPrivacyLabel (privacy: VideoPlaylistPrivacy) {
+    return VIDEO_PLAYLIST_PRIVACIES[privacy] || 'Unknown'
+  }
+
+  getThumbnailName () {
+    const extension = '.jpg'
+
+    return 'playlist-' + this.uuid + extension
+  }
+
+  getThumbnailUrl () {
+    return CONFIG.WEBSERVER.URL + STATIC_PATHS.THUMBNAILS + this.getThumbnailName()
+  }
+
+  getThumbnailStaticPath () {
+    return join(STATIC_PATHS.THUMBNAILS, this.getThumbnailName())
+  }
+
+  removeThumbnail () {
+    const thumbnailPath = join(CONFIG.STORAGE.THUMBNAILS_DIR, this.getThumbnailName())
+    return remove(thumbnailPath)
+      .catch(err => logger.warn('Cannot delete thumbnail %s.', thumbnailPath, { err }))
+  }
+
+  isOwned () {
+    return this.OwnerAccount.isOwned()
+  }
+
+  toFormattedJSON (): VideoPlaylist {
+    return {
+      id: this.id,
+      uuid: this.uuid,
+      isLocal: this.isOwned(),
+
+      displayName: this.name,
+      description: this.description,
+      privacy: {
+        id: this.privacy,
+        label: VideoPlaylistModel.getPrivacyLabel(this.privacy)
+      },
+
+      thumbnailPath: this.getThumbnailStaticPath(),
+
+      videosLength: this.videosLength,
+
+      createdAt: this.createdAt,
+      updatedAt: this.updatedAt,
+
+      ownerAccount: this.OwnerAccount.toFormattedSummaryJSON(),
+      videoChannel: this.VideoChannel.toFormattedSummaryJSON()
+    }
+  }
+
+  toActivityPubObject (): Promise<PlaylistObject> {
+    const handler = (start: number, count: number) => {
+      return VideoPlaylistElementModel.listUrlsOfForAP(this.id, start, count)
+    }
+
+    return activityPubCollectionPagination(this.url, handler, null)
+      .then(o => {
+        return Object.assign(o, {
+          type: 'Playlist' as 'Playlist',
+          name: this.name,
+          content: this.description,
+          uuid: this.uuid,
+          attributedTo: this.VideoChannel ? [ this.VideoChannel.Actor.url ] : [],
+          icon: {
+            type: 'Image' as 'Image',
+            url: this.getThumbnailUrl(),
+            mediaType: 'image/jpeg' as 'image/jpeg',
+            width: THUMBNAILS_SIZE.width,
+            height: THUMBNAILS_SIZE.height
+          }
+        })
+      })
+  }
+}
diff --git a/server/models/video/video.ts b/server/models/video/video.ts
index 4516b9c7b..7a102b058 100644
--- a/server/models/video/video.ts
+++ b/server/models/video/video.ts
@@ -40,7 +40,7 @@ import {
   isVideoDurationValid,
   isVideoLanguageValid,
   isVideoLicenceValid,
-  isVideoNameValid, isVideoOriginallyPublishedAtValid,
+  isVideoNameValid,
   isVideoPrivacyValid,
   isVideoStateValid,
   isVideoSupportValid
@@ -52,7 +52,9 @@ import {
   ACTIVITY_PUB,
   API_VERSION,
   CONFIG,
-  CONSTRAINTS_FIELDS, HLS_PLAYLIST_DIRECTORY, HLS_REDUNDANCY_DIRECTORY,
+  CONSTRAINTS_FIELDS,
+  HLS_PLAYLIST_DIRECTORY,
+  HLS_REDUNDANCY_DIRECTORY,
   PREVIEWS_SIZE,
   REMOTE_SCHEME,
   STATIC_DOWNLOAD_PATHS,
@@ -70,10 +72,17 @@ import { AccountVideoRateModel } from '../account/account-video-rate'
 import { ActorModel } from '../activitypub/actor'
 import { AvatarModel } from '../avatar/avatar'
 import { ServerModel } from '../server/server'
-import { buildBlockedAccountSQL, buildTrigramSearchIndex, createSimilarityAttribute, getVideoSort, throwIfNotValid } from '../utils'
+import {
+  buildBlockedAccountSQL,
+  buildTrigramSearchIndex,
+  buildWhereIdOrUUID,
+  createSimilarityAttribute,
+  getVideoSort,
+  throwIfNotValid
+} from '../utils'
 import { TagModel } from './tag'
 import { VideoAbuseModel } from './video-abuse'
-import { VideoChannelModel } from './video-channel'
+import { VideoChannelModel, ScopeNames as VideoChannelScopeNames } from './video-channel'
 import { VideoCommentModel } from './video-comment'
 import { VideoFileModel } from './video-file'
 import { VideoShareModel } from './video-share'
@@ -91,11 +100,11 @@ import {
   videoModelToFormattedDetailsJSON,
   videoModelToFormattedJSON
 } from './video-format-utils'
-import * as validator from 'validator'
 import { UserVideoHistoryModel } from '../account/user-video-history'
 import { UserModel } from '../account/user'
 import { VideoImportModel } from './video-import'
 import { VideoStreamingPlaylistModel } from './video-streaming-playlist'
+import { VideoPlaylistElementModel } from './video-playlist-element'
 
 // FIXME: Define indexes here because there is an issue with TS and Sequelize.literal when called directly in the annotation
 const indexes: Sequelize.DefineIndexesOptions[] = [
@@ -175,6 +184,9 @@ export enum ScopeNames {
 
 type ForAPIOptions = {
   ids: number[]
+
+  videoPlaylistId?: number
+
   withFiles?: boolean
 }
 
@@ -182,6 +194,7 @@ type AvailableForListIDsOptions = {
   serverAccountId: number
   followerActorId: number
   includeLocalVideos: boolean
+
   filter?: VideoFilter
   categoryOneOf?: number[]
   nsfw?: boolean
@@ -189,9 +202,14 @@ type AvailableForListIDsOptions = {
   languageOneOf?: string[]
   tagsOneOf?: string[]
   tagsAllOf?: string[]
+
   withFiles?: boolean
+
   accountId?: number
   videoChannelId?: number
+
+  videoPlaylistId?: number
+
   trendingDays?: number
   user?: UserModel,
   historyOfUser?: UserModel
@@ -199,62 +217,17 @@ type AvailableForListIDsOptions = {
 
 @Scopes({
   [ ScopeNames.FOR_API ]: (options: ForAPIOptions) => {
-    const accountInclude = {
-      attributes: [ 'id', 'name' ],
-      model: AccountModel.unscoped(),
-      required: true,
-      include: [
-        {
-          attributes: [ 'id', 'uuid', 'preferredUsername', 'url', 'serverId', 'avatarId' ],
-          model: ActorModel.unscoped(),
-          required: true,
-          include: [
-            {
-              attributes: [ 'host' ],
-              model: ServerModel.unscoped(),
-              required: false
-            },
-            {
-              model: AvatarModel.unscoped(),
-              required: false
-            }
-          ]
-        }
-      ]
-    }
-
-    const videoChannelInclude = {
-      attributes: [ 'name', 'description', 'id' ],
-      model: VideoChannelModel.unscoped(),
-      required: true,
-      include: [
-        {
-          attributes: [ 'uuid', 'preferredUsername', 'url', 'serverId', 'avatarId' ],
-          model: ActorModel.unscoped(),
-          required: true,
-          include: [
-            {
-              attributes: [ 'host' ],
-              model: ServerModel.unscoped(),
-              required: false
-            },
-            {
-              model: AvatarModel.unscoped(),
-              required: false
-            }
-          ]
-        },
-        accountInclude
-      ]
-    }
-
     const query: IFindOptions<VideoModel> = {
       where: {
         id: {
           [ Sequelize.Op.any ]: options.ids
         }
       },
-      include: [ videoChannelInclude ]
+      include: [
+        {
+          model: VideoChannelModel.scope(VideoChannelScopeNames.SUMMARY)
+        }
+      ]
     }
 
     if (options.withFiles === true) {
@@ -264,6 +237,13 @@ type AvailableForListIDsOptions = {
       })
     }
 
+    if (options.videoPlaylistId) {
+      query.include.push({
+        model: VideoPlaylistElementModel.unscoped(),
+        required: true
+      })
+    }
+
     return query
   },
   [ ScopeNames.AVAILABLE_FOR_LIST_IDS ]: (options: AvailableForListIDsOptions) => {
@@ -315,6 +295,17 @@ type AvailableForListIDsOptions = {
       Object.assign(query.where, privacyWhere)
     }
 
+    if (options.videoPlaylistId) {
+      query.include.push({
+        attributes: [],
+        model: VideoPlaylistElementModel.unscoped(),
+        required: true,
+        where: {
+          videoPlaylistId: options.videoPlaylistId
+        }
+      })
+    }
+
     if (options.filter || options.accountId || options.videoChannelId) {
       const videoChannelInclude: IIncludeOptions = {
         attributes: [],
@@ -772,6 +763,15 @@ export class VideoModel extends Model<VideoModel> {
   })
   Tags: TagModel[]
 
+  @HasMany(() => VideoPlaylistElementModel, {
+    foreignKey: {
+      name: 'videoId',
+      allowNull: false
+    },
+    onDelete: 'cascade'
+  })
+  VideoPlaylistElements: VideoPlaylistElementModel[]
+
   @HasMany(() => VideoAbuseModel, {
     foreignKey: {
       name: 'videoId',
@@ -1118,6 +1118,7 @@ export class VideoModel extends Model<VideoModel> {
     accountId?: number,
     videoChannelId?: number,
     followerActorId?: number
+    videoPlaylistId?: number,
     trendingDays?: number,
     user?: UserModel,
     historyOfUser?: UserModel
@@ -1157,6 +1158,7 @@ export class VideoModel extends Model<VideoModel> {
       withFiles: options.withFiles,
       accountId: options.accountId,
       videoChannelId: options.videoChannelId,
+      videoPlaylistId: options.videoPlaylistId,
       includeLocalVideos: options.includeLocalVideos,
       user: options.user,
       historyOfUser: options.historyOfUser,
@@ -1280,7 +1282,7 @@ export class VideoModel extends Model<VideoModel> {
   }
 
   static load (id: number | string, t?: Sequelize.Transaction) {
-    const where = VideoModel.buildWhereIdOrUUID(id)
+    const where = buildWhereIdOrUUID(id)
     const options = {
       where,
       transaction: t
@@ -1290,7 +1292,7 @@ export class VideoModel extends Model<VideoModel> {
   }
 
   static loadWithRights (id: number | string, t?: Sequelize.Transaction) {
-    const where = VideoModel.buildWhereIdOrUUID(id)
+    const where = buildWhereIdOrUUID(id)
     const options = {
       where,
       transaction: t
@@ -1300,7 +1302,7 @@ export class VideoModel extends Model<VideoModel> {
   }
 
   static loadOnlyId (id: number | string, t?: Sequelize.Transaction) {
-    const where = VideoModel.buildWhereIdOrUUID(id)
+    const where = buildWhereIdOrUUID(id)
 
     const options = {
       attributes: [ 'id' ],
@@ -1353,7 +1355,7 @@ export class VideoModel extends Model<VideoModel> {
   }
 
   static loadAndPopulateAccountAndServerAndTags (id: number | string, t?: Sequelize.Transaction, userId?: number) {
-    const where = VideoModel.buildWhereIdOrUUID(id)
+    const where = buildWhereIdOrUUID(id)
 
     const options = {
       order: [ [ 'Tags', 'name', 'ASC' ] ],
@@ -1380,7 +1382,7 @@ export class VideoModel extends Model<VideoModel> {
   }
 
   static loadForGetAPI (id: number | string, t?: Sequelize.Transaction, userId?: number) {
-    const where = VideoModel.buildWhereIdOrUUID(id)
+    const where = buildWhereIdOrUUID(id)
 
     const options = {
       order: [ [ 'Tags', 'name', 'ASC' ] ],
@@ -1582,10 +1584,6 @@ export class VideoModel extends Model<VideoModel> {
     return VIDEO_STATES[ id ] || 'Unknown'
   }
 
-  static buildWhereIdOrUUID (id: number | string) {
-    return validator.isInt('' + id) ? { id } : { uuid: id }
-  }
-
   getOriginalFile () {
     if (Array.isArray(this.VideoFiles) === false) return undefined
 
@@ -1598,7 +1596,6 @@ export class VideoModel extends Model<VideoModel> {
   }
 
   getThumbnailName () {
-    // We always have a copy of the thumbnail
     const extension = '.jpg'
     return this.uuid + extension
   }