18 files changed, 490 insertions, 86 deletions

diff --git a/server/controllers/api/search.ts b/server/controllers/api/search.ts
index f408e7932..87aa5d76f 100644
--- a/server/controllers/api/search.ts
+++ b/server/controllers/api/search.ts
@@ -1,22 +1,26 @@
 import * as express from 'express'
 import { buildNSFWFilter } from '../../helpers/express-utils'
-import { getFormattedObjects } from '../../helpers/utils'
+import { getFormattedObjects, getServerActor } from '../../helpers/utils'
 import { VideoModel } from '../../models/video/video'
 import {
   asyncMiddleware,
   commonVideosFiltersValidator,
   optionalAuthenticate,
   paginationValidator,
-  searchValidator,
   setDefaultPagination,
   setDefaultSearchSort,
-  videosSearchSortValidator
+  videoChannelsSearchSortValidator,
+  videoChannelsSearchValidator,
+  videosSearchSortValidator,
+  videosSearchValidator
 } from '../../middlewares'
-import { VideosSearchQuery } from '../../../shared/models/search'
-import { getOrCreateVideoAndAccountAndChannel } from '../../lib/activitypub'
+import { VideoChannelsSearchQuery, VideosSearchQuery } from '../../../shared/models/search'
+import { getOrCreateActorAndServerAndModel, getOrCreateVideoAndAccountAndChannel } from '../../lib/activitypub'
 import { logger } from '../../helpers/logger'
 import { User } from '../../../shared/models/users'
 import { CONFIG } from '../../initializers/constants'
+import { VideoChannelModel } from '../../models/video/video-channel'
+import { loadActorUrlOrGetFromWebfinger } from '../../helpers/webfinger'
 
 const searchRouter = express.Router()
 
@@ -27,21 +31,80 @@ searchRouter.get('/videos',
   setDefaultSearchSort,
   optionalAuthenticate,
   commonVideosFiltersValidator,
-  searchValidator,
+  videosSearchValidator,
   asyncMiddleware(searchVideos)
 )
 
+searchRouter.get('/video-channels',
+  paginationValidator,
+  setDefaultPagination,
+  videoChannelsSearchSortValidator,
+  setDefaultSearchSort,
+  optionalAuthenticate,
+  commonVideosFiltersValidator,
+  videoChannelsSearchValidator,
+  asyncMiddleware(searchVideoChannels)
+)
+
 // ---------------------------------------------------------------------------
 
 export { searchRouter }
 
 // ---------------------------------------------------------------------------
 
+function searchVideoChannels (req: express.Request, res: express.Response) {
+  const query: VideoChannelsSearchQuery = req.query
+  const search = query.search
+
+  const isURISearch = search.startsWith('http://') || search.startsWith('https://')
+
+  const parts = search.split('@')
+  const isHandleSearch = parts.length === 2 && parts.every(p => p.indexOf(' ') === -1)
+
+  if (isURISearch || isHandleSearch) return searchVideoChannelURI(search, isHandleSearch, res)
+
+  return searchVideoChannelsDB(query, res)
+}
+
+async function searchVideoChannelsDB (query: VideoChannelsSearchQuery, res: express.Response) {
+  const serverActor = await getServerActor()
+
+  const options = {
+    actorId: serverActor.id,
+    search: query.search,
+    start: query.start,
+    count: query.count,
+    sort: query.sort
+  }
+  const resultList = await VideoChannelModel.searchForApi(options)
+
+  return res.json(getFormattedObjects(resultList.data, resultList.total))
+}
+
+async function searchVideoChannelURI (search: string, isHandleSearch: boolean, res: express.Response) {
+  let videoChannel: VideoChannelModel
+
+  if (isUserAbleToSearchRemoteURI(res)) {
+    let uri = search
+    if (isHandleSearch) uri = await loadActorUrlOrGetFromWebfinger(search)
+
+    const actor = await getOrCreateActorAndServerAndModel(uri)
+    videoChannel = actor.VideoChannel
+  } else {
+    videoChannel = await VideoChannelModel.loadByUrlAndPopulateAccount(search)
+  }
+
+  return res.json({
+    total: videoChannel ? 1 : 0,
+    data: videoChannel ? [ videoChannel.toFormattedJSON() ] : []
+  })
+}
+
 function searchVideos (req: express.Request, res: express.Response) {
   const query: VideosSearchQuery = req.query
   const search = query.search
   if (search && (search.startsWith('http://') || search.startsWith('https://'))) {
-    return searchVideoUrl(search, res)
+    return searchVideoURI(search, res)
   }
 
   return searchVideosDB(query, res)
@@ -57,15 +120,11 @@ async function searchVideosDB (query: VideosSearchQuery, res: express.Response)
   return res.json(getFormattedObjects(resultList.data, resultList.total))
 }
 
-async function searchVideoUrl (url: string, res: express.Response) {
+async function searchVideoURI (url: string, res: express.Response) {
   let video: VideoModel
-  const user: User = res.locals.oauth ? res.locals.oauth.token.User : undefined
 
   // Check if we can fetch a remote video with the URL
-  if (
-    CONFIG.SEARCH.REMOTE_URI.ANONYMOUS === true ||
-    (CONFIG.SEARCH.REMOTE_URI.USERS === true && user !== undefined)
-  ) {
+  if (isUserAbleToSearchRemoteURI(res)) {
     try {
       const syncParam = {
         likes: false,
@@ -76,8 +135,8 @@ async function searchVideoUrl (url: string, res: express.Response) {
         refreshVideo: false
       }
 
-      const res = await getOrCreateVideoAndAccountAndChannel(url, syncParam)
-      video = res ? res.video : undefined
+      const result = await getOrCreateVideoAndAccountAndChannel(url, syncParam)
+      video = result ? result.video : undefined
     } catch (err) {
       logger.info('Cannot search remote video %s.', url)
     }
@@ -90,3 +149,10 @@ async function searchVideoUrl (url: string, res: express.Response) {
     data: video ? [ video.toFormattedJSON() ] : []
   })
 }
+
+function isUserAbleToSearchRemoteURI (res: express.Response) {
+  const user: User = res.locals.oauth ? res.locals.oauth.token.User : undefined
+
+  return CONFIG.SEARCH.REMOTE_URI.ANONYMOUS === true ||
+    (CONFIG.SEARCH.REMOTE_URI.USERS === true && user !== undefined)
+}
diff --git a/server/controllers/api/users/me.ts b/server/controllers/api/users/me.ts
index 2300f5dbe..000c706b5 100644
--- a/server/controllers/api/users/me.ts
+++ b/server/controllers/api/users/me.ts
@@ -20,7 +20,8 @@ import {
   deleteMeValidator,
   userSubscriptionsSortValidator,
   videoImportsSortValidator,
-  videosSortValidator
+  videosSortValidator,
+  areSubscriptionsExistValidator
 } from '../../../middlewares/validators'
 import { AccountVideoRateModel } from '../../../models/account/account-video-rate'
 import { UserModel } from '../../../models/account/user'
@@ -99,7 +100,6 @@ meRouter.post('/me/avatar/pick',
 
 meRouter.get('/me/subscriptions/videos',
   authenticate,
-  authenticate,
   paginationValidator,
   videosSortValidator,
   setDefaultSort,
@@ -108,6 +108,12 @@ meRouter.get('/me/subscriptions/videos',
   asyncMiddleware(getUserSubscriptionVideos)
 )
 
+meRouter.get('/me/subscriptions/exist',
+  authenticate,
+  areSubscriptionsExistValidator,
+  asyncMiddleware(areSubscriptionsExist)
+)
+
 meRouter.get('/me/subscriptions',
   authenticate,
   paginationValidator,
@@ -143,6 +149,37 @@ export {
 
 // ---------------------------------------------------------------------------
 
+async function areSubscriptionsExist (req: express.Request, res: express.Response) {
+  const uris = req.query.uris as string[]
+  const user = res.locals.oauth.token.User as UserModel
+
+  const handles = uris.map(u => {
+    let [ name, host ] = u.split('@')
+    if (host === CONFIG.WEBSERVER.HOST) host = null
+
+    return { name, host, uri: u }
+  })
+
+  const results = await ActorFollowModel.listSubscribedIn(user.Account.Actor.id, handles)
+
+  const existObject: { [id: string ]: boolean } = {}
+  for (const handle of handles) {
+    const obj = results.find(r => {
+      const server = r.ActorFollowing.Server
+
+      return r.ActorFollowing.preferredUsername === handle.name &&
+        (
+          (!server && !handle.host) ||
+          (server.host === handle.host)
+        )
+    })
+
+    existObject[handle.uri] = obj !== undefined
+  }
+
+  return res.json(existObject)
+}
+
 async function addUserSubscription (req: express.Request, res: express.Response) {
   const user = res.locals.oauth.token.User as UserModel
   const [ name, host ] = req.body.uri.split('@')
diff --git a/server/controllers/api/video-channel.ts b/server/controllers/api/video-channel.ts
index 3f51f03f4..bd08d7a08 100644
--- a/server/controllers/api/video-channel.ts
+++ b/server/controllers/api/video-channel.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { getFormattedObjects } from '../../helpers/utils'
+import { getFormattedObjects, getServerActor } from '../../helpers/utils'
 import {
   asyncMiddleware,
   asyncRetryTransactionMiddleware,
@@ -95,7 +95,8 @@ export {
 // ---------------------------------------------------------------------------
 
 async function listVideoChannels (req: express.Request, res: express.Response, next: express.NextFunction) {
-  const resultList = await VideoChannelModel.listForApi(req.query.start, req.query.count, req.query.sort)
+  const serverActor = await getServerActor()
+  const resultList = await VideoChannelModel.listForApi(serverActor.id, req.query.start, req.query.count, req.query.sort)
 
   return res.json(getFormattedObjects(resultList.data, resultList.total))
 }
diff --git a/server/helpers/custom-validators/activitypub/actor.ts b/server/helpers/custom-validators/activitypub/actor.ts
index c3a62c12d..6958b2b00 100644
--- a/server/helpers/custom-validators/activitypub/actor.ts
+++ b/server/helpers/custom-validators/activitypub/actor.ts
@@ -1,6 +1,6 @@
 import * as validator from 'validator'
 import { CONSTRAINTS_FIELDS } from '../../../initializers'
-import { exists } from '../misc'
+import { exists, isArray } from '../misc'
 import { truncate } from 'lodash'
 import { isActivityPubUrlValid, isBaseActivityValid, setValidAttributedTo } from './misc'
 import { isHostValid } from '../servers'
@@ -119,10 +119,15 @@ function isValidActorHandle (handle: string) {
   return isHostValid(parts[1])
 }
 
+function areValidActorHandles (handles: string[]) {
+  return isArray(handles) && handles.every(h => isValidActorHandle(h))
+}
+
 // ---------------------------------------------------------------------------
 
 export {
   normalizeActor,
+  areValidActorHandles,
   isActorEndpointsObjectValid,
   isActorPublicKeyObjectValid,
   isActorTypeValid,
diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index 46b63c5e9..9beb9b7c2 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -43,7 +43,8 @@ const SORTABLE_COLUMNS = {
   FOLLOWERS: [ 'createdAt' ],
   FOLLOWING: [ 'createdAt' ],
 
-  VIDEOS_SEARCH: [ 'match', 'name', 'duration', 'createdAt', 'publishedAt', 'views', 'likes' ]
+  VIDEOS_SEARCH: [ 'match', 'name', 'duration', 'createdAt', 'publishedAt', 'views', 'likes' ],
+  VIDEO_CHANNELS_SEARCH: [ 'match', 'displayName' ]
 }
 
 const OAUTH_LIFETIME = {
diff --git a/server/lib/activitypub/process/process-update.ts b/server/lib/activitypub/process/process-update.ts
index 07a5ff92f..d2ad738a2 100644
--- a/server/lib/activitypub/process/process-update.ts
+++ b/server/lib/activitypub/process/process-update.ts
@@ -7,7 +7,7 @@ import { AccountModel } from '../../../models/account/account'
 import { ActorModel } from '../../../models/activitypub/actor'
 import { VideoChannelModel } from '../../../models/video/video-channel'
 import { fetchAvatarIfExists, getOrCreateActorAndServerAndModel, updateActorAvatarInstance, updateActorInstance } from '../actor'
-import { getOrCreateVideoAndAccountAndChannel, getOrCreateVideoChannel, updateVideoFromAP } from '../videos'
+import { getOrCreateVideoAndAccountAndChannel, getOrCreateVideoChannelFromVideoObject, updateVideoFromAP } from '../videos'
 import { sanitizeAndCheckVideoTorrentObject } from '../../../helpers/custom-validators/activitypub/videos'
 
 async function processUpdateActivity (activity: ActivityUpdate) {
@@ -40,7 +40,7 @@ async function processUpdateVideo (actor: ActorModel, activity: ActivityUpdate)
   }
 
   const { video } = await getOrCreateVideoAndAccountAndChannel(videoObject.id)
-  const channelActor = await getOrCreateVideoChannel(videoObject)
+  const channelActor = await getOrCreateVideoChannelFromVideoObject(videoObject)
 
   return updateVideoFromAP(video, videoObject, actor, channelActor, activity.to)
 }
diff --git a/server/lib/activitypub/videos.ts b/server/lib/activitypub/videos.ts
index 388c31fe5..6c2095897 100644
--- a/server/lib/activitypub/videos.ts
+++ b/server/lib/activitypub/videos.ts
@@ -174,7 +174,7 @@ function videoFileActivityUrlToDBAttributes (videoCreated: VideoModel, videoObje
   return attributes
 }
 
-function getOrCreateVideoChannel (videoObject: VideoTorrentObject) {
+function getOrCreateVideoChannelFromVideoObject (videoObject: VideoTorrentObject) {
   const channel = videoObject.attributedTo.find(a => a.type === 'Group')
   if (!channel) throw new Error('Cannot find associated video channel to video ' + videoObject.url)
 
@@ -251,7 +251,7 @@ async function getOrCreateVideoAndAccountAndChannel (
   const { videoObject: fetchedVideo } = await fetchRemoteVideo(videoUrl)
   if (!fetchedVideo) throw new Error('Cannot fetch remote video with url: ' + videoUrl)
 
-  const channelActor = await getOrCreateVideoChannel(fetchedVideo)
+  const channelActor = await getOrCreateVideoChannelFromVideoObject(fetchedVideo)
   const video = await retryTransactionWrapper(createVideo, fetchedVideo, channelActor, syncParam.thumbnail)
 
   // Process outside the transaction because we could fetch remote data
@@ -329,7 +329,7 @@ async function refreshVideoIfNeeded (video: VideoModel): Promise<VideoModel> {
       return video
     }
 
-    const channelActor = await getOrCreateVideoChannel(videoObject)
+    const channelActor = await getOrCreateVideoChannelFromVideoObject(videoObject)
     const account = await AccountModel.load(channelActor.VideoChannel.accountId)
     return updateVideoFromAP(video, videoObject, account.Actor, channelActor)
 
@@ -440,7 +440,7 @@ export {
   videoActivityObjectToDBAttributes,
   videoFileActivityUrlToDBAttributes,
   createVideo,
-  getOrCreateVideoChannel,
+  getOrCreateVideoChannelFromVideoObject,
   addVideoShares,
   createRates
 }
diff --git a/server/middlewares/validators/follows.ts b/server/middlewares/validators/follows.ts
index faefc1179..73fa28be9 100644
--- a/server/middlewares/validators/follows.ts
+++ b/server/middlewares/validators/follows.ts
@@ -38,7 +38,7 @@ const removeFollowingValidator = [
     if (areValidationErrors(req, res)) return
 
     const serverActor = await getServerActor()
-    const follow = await ActorFollowModel.loadByActorAndTargetNameAndHost(serverActor.id, SERVER_ACTOR_NAME, req.params.host)
+    const follow = await ActorFollowModel.loadByActorAndTargetNameAndHostForAPI(serverActor.id, SERVER_ACTOR_NAME, req.params.host)
 
     if (!follow) {
       return res
diff --git a/server/middlewares/validators/search.ts b/server/middlewares/validators/search.ts
index e516c4c41..8baf643a5 100644
--- a/server/middlewares/validators/search.ts
+++ b/server/middlewares/validators/search.ts
@@ -5,7 +5,7 @@ import { query } from 'express-validator/check'
 import { isNumberArray, isStringArray, isNSFWQueryValid } from '../../helpers/custom-validators/search'
 import { isBooleanValid, isDateValid, toArray } from '../../helpers/custom-validators/misc'
 
-const searchValidator = [
+const videosSearchValidator = [
   query('search').optional().not().isEmpty().withMessage('Should have a valid search'),
 
   query('startDate').optional().custom(isDateValid).withMessage('Should have a valid start date'),
@@ -15,7 +15,19 @@ const searchValidator = [
   query('durationMax').optional().isInt().withMessage('Should have a valid max duration'),
 
   (req: express.Request, res: express.Response, next: express.NextFunction) => {
-    logger.debug('Checking search query', { parameters: req.query })
+    logger.debug('Checking videos search query', { parameters: req.query })
+
+    if (areValidationErrors(req, res)) return
+
+    return next()
+  }
+]
+
+const videoChannelsSearchValidator = [
+  query('search').not().isEmpty().withMessage('Should have a valid search'),
+
+  (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    logger.debug('Checking video channels search query', { parameters: req.query })
 
     if (areValidationErrors(req, res)) return
 
@@ -61,5 +73,6 @@ const commonVideosFiltersValidator = [
 
 export {
   commonVideosFiltersValidator,
-  searchValidator
+  videoChannelsSearchValidator,
+  videosSearchValidator
 }
diff --git a/server/middlewares/validators/sort.ts b/server/middlewares/validators/sort.ts
index b30e97e61..08dcc2680 100644
--- a/server/middlewares/validators/sort.ts
+++ b/server/middlewares/validators/sort.ts
@@ -8,6 +8,7 @@ const SORTABLE_JOBS_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.JOBS)
 const SORTABLE_VIDEO_ABUSES_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.VIDEO_ABUSES)
 const SORTABLE_VIDEOS_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.VIDEOS)
 const SORTABLE_VIDEOS_SEARCH_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.VIDEOS_SEARCH)
+const SORTABLE_VIDEO_CHANNELS_SEARCH_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.VIDEO_CHANNELS_SEARCH)
 const SORTABLE_VIDEO_IMPORTS_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.VIDEO_IMPORTS)
 const SORTABLE_VIDEO_COMMENT_THREADS_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.VIDEO_COMMENT_THREADS)
 const SORTABLE_BLACKLISTS_COLUMNS = createSortableColumns(SORTABLE_COLUMNS.BLACKLISTS)
@@ -23,6 +24,7 @@ const videoAbusesSortValidator = checkSort(SORTABLE_VIDEO_ABUSES_COLUMNS)
 const videosSortValidator = checkSort(SORTABLE_VIDEOS_COLUMNS)
 const videoImportsSortValidator = checkSort(SORTABLE_VIDEO_IMPORTS_COLUMNS)
 const videosSearchSortValidator = checkSort(SORTABLE_VIDEOS_SEARCH_COLUMNS)
+const videoChannelsSearchSortValidator = checkSort(SORTABLE_VIDEO_CHANNELS_SEARCH_COLUMNS)
 const videoCommentThreadsSortValidator = checkSort(SORTABLE_VIDEO_COMMENT_THREADS_COLUMNS)
 const blacklistSortValidator = checkSort(SORTABLE_BLACKLISTS_COLUMNS)
 const videoChannelsSortValidator = checkSort(SORTABLE_VIDEO_CHANNELS_COLUMNS)
@@ -45,5 +47,6 @@ export {
   followingSortValidator,
   jobsSortValidator,
   videoCommentThreadsSortValidator,
-  userSubscriptionsSortValidator
+  userSubscriptionsSortValidator,
+  videoChannelsSearchSortValidator
 }
diff --git a/server/middlewares/validators/user-subscriptions.ts b/server/middlewares/validators/user-subscriptions.ts
index d8c26c742..c5f8d9d4c 100644
--- a/server/middlewares/validators/user-subscriptions.ts
+++ b/server/middlewares/validators/user-subscriptions.ts
@@ -1,12 +1,13 @@
 import * as express from 'express'
 import 'express-validator'
-import { body, param } from 'express-validator/check'
+import { body, param, query } from 'express-validator/check'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { ActorFollowModel } from '../../models/activitypub/actor-follow'
-import { isValidActorHandle } from '../../helpers/custom-validators/activitypub/actor'
+import { areValidActorHandles, isValidActorHandle } from '../../helpers/custom-validators/activitypub/actor'
 import { UserModel } from '../../models/account/user'
 import { CONFIG } from '../../initializers'
+import { toArray } from '../../helpers/custom-validators/misc'
 
 const userSubscriptionAddValidator = [
   body('uri').custom(isValidActorHandle).withMessage('Should have a valid URI to follow (username@domain)'),
@@ -20,6 +21,20 @@ const userSubscriptionAddValidator = [
   }
 ]
 
+const areSubscriptionsExistValidator = [
+  query('uris')
+    .customSanitizer(toArray)
+    .custom(areValidActorHandles).withMessage('Should have a valid uri array'),
+
+  (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    logger.debug('Checking areSubscriptionsExistValidator parameters', { parameters: req.query })
+
+    if (areValidationErrors(req, res)) return
+
+    return next()
+  }
+]
+
 const userSubscriptionGetValidator = [
   param('uri').custom(isValidActorHandle).withMessage('Should have a valid URI to unfollow'),
 
@@ -32,7 +47,7 @@ const userSubscriptionGetValidator = [
     if (host === CONFIG.WEBSERVER.HOST) host = null
 
     const user: UserModel = res.locals.oauth.token.User
-    const subscription = await ActorFollowModel.loadByActorAndTargetNameAndHost(user.Account.Actor.id, name, host)
+    const subscription = await ActorFollowModel.loadByActorAndTargetNameAndHostForAPI(user.Account.Actor.id, name, host)
 
     if (!subscription || !subscription.ActorFollowing.VideoChannel) {
       return res
@@ -51,8 +66,7 @@ const userSubscriptionGetValidator = [
 // ---------------------------------------------------------------------------
 
 export {
+  areSubscriptionsExistValidator,
   userSubscriptionAddValidator,
   userSubscriptionGetValidator
 }
-
-// ---------------------------------------------------------------------------
diff --git a/server/models/account/account.ts b/server/models/account/account.ts
index 07539a04e..6bbfc6f4e 100644
--- a/server/models/account/account.ts
+++ b/server/models/account/account.ts
@@ -29,18 +29,8 @@ import { UserModel } from './user'
 @DefaultScope({
   include: [
     {
-      model: () => ActorModel,
-      required: true,
-      include: [
-        {
-          model: () => ServerModel,
-          required: false
-        },
-        {
-          model: () => AvatarModel,
-          required: false
-        }
-      ]
+      model: () => ActorModel, // Default scope includes avatar and server
+      required: true
     }
   ]
 })
diff --git a/server/models/activitypub/actor-follow.ts b/server/models/activitypub/actor-follow.ts
index b2d7ace66..81fcf7001 100644
--- a/server/models/activitypub/actor-follow.ts
+++ b/server/models/activitypub/actor-follow.ts
@@ -26,7 +26,7 @@ import { ACTOR_FOLLOW_SCORE } from '../../initializers'
 import { FOLLOW_STATES } from '../../initializers/constants'
 import { ServerModel } from '../server/server'
 import { getSort } from '../utils'
-import { ActorModel } from './actor'
+import { ActorModel, unusedActorAttributesForAPI } from './actor'
 import { VideoChannelModel } from '../video/video-channel'
 import { IIncludeOptions } from '../../../node_modules/sequelize-typescript/lib/interfaces/IIncludeOptions'
 import { AccountModel } from '../account/account'
@@ -167,8 +167,11 @@ export class ActorFollowModel extends Model<ActorFollowModel> {
     return ActorFollowModel.findOne(query)
   }
 
-  static loadByActorAndTargetNameAndHost (actorId: number, targetName: string, targetHost: string, t?: Sequelize.Transaction) {
+  static loadByActorAndTargetNameAndHostForAPI (actorId: number, targetName: string, targetHost: string, t?: Sequelize.Transaction) {
     const actorFollowingPartInclude: IIncludeOptions = {
+      attributes: {
+        exclude: unusedActorAttributesForAPI
+      },
       model: ActorModel,
       required: true,
       as: 'ActorFollowing',
@@ -177,7 +180,7 @@ export class ActorFollowModel extends Model<ActorFollowModel> {
       },
       include: [
         {
-          model: VideoChannelModel,
+          model: VideoChannelModel.unscoped(),
           required: false
         }
       ]
@@ -200,17 +203,79 @@ export class ActorFollowModel extends Model<ActorFollowModel> {
         actorId
       },
       include: [
-        {
-          model: ActorModel,
-          required: true,
-          as: 'ActorFollower'
-        },
         actorFollowingPartInclude
       ],
       transaction: t
     }
 
     return ActorFollowModel.findOne(query)
+      .then(result => {
+        if (result && result.ActorFollowing.VideoChannel) {
+          result.ActorFollowing.VideoChannel.Actor = result.ActorFollowing
+        }
+
+        return result
+      })
+  }
+
+  static listSubscribedIn (actorId: number, targets: { name: string, host?: string }[]) {
+    const whereTab = targets
+      .map(t => {
+        if (t.host) {
+          return {
+            [ Sequelize.Op.and ]: [
+              {
+                '$preferredUsername$': t.name
+              },
+              {
+                '$host$': t.host
+              }
+            ]
+          }
+        }
+
+        return {
+          [ Sequelize.Op.and ]: [
+            {
+              '$preferredUsername$': t.name
+            },
+            {
+              '$serverId$': null
+            }
+          ]
+        }
+      })
+
+    const query = {
+      attributes: [],
+      where: {
+        [ Sequelize.Op.and ]: [
+          {
+            [ Sequelize.Op.or ]: whereTab
+          },
+          {
+            actorId
+          }
+        ]
+      },
+      include: [
+        {
+          attributes: [ 'preferredUsername' ],
+          model: ActorModel.unscoped(),
+          required: true,
+          as: 'ActorFollowing',
+          include: [
+            {
+              attributes: [ 'host' ],
+              model: ServerModel.unscoped(),
+              required: false
+            }
+          ]
+        }
+      ]
+    }
+
+    return ActorFollowModel.findAll(query)
   }
 
   static listFollowingForApi (id: number, start: number, count: number, sort: string) {
@@ -248,6 +313,7 @@ export class ActorFollowModel extends Model<ActorFollowModel> {
 
   static listSubscriptionsForApi (id: number, start: number, count: number, sort: string) {
     const query = {
+      attributes: [],
       distinct: true,
       offset: start,
       limit: count,
@@ -257,6 +323,9 @@ export class ActorFollowModel extends Model<ActorFollowModel> {
       },
       include: [
         {
+          attributes: {
+            exclude: unusedActorAttributesForAPI
+          },
           model: ActorModel,
           as: 'ActorFollowing',
           required: true,
@@ -266,8 +335,24 @@ export class ActorFollowModel extends Model<ActorFollowModel> {
               required: true,
               include: [
                 {
-                  model: AccountModel,
+                  attributes: {
+                    exclude: unusedActorAttributesForAPI
+                  },
+                  model: ActorModel,
                   required: true
+                },
+                {
+                  model: AccountModel,
+                  required: true,
+                  include: [
+                    {
+                      attributes: {
+                        exclude: unusedActorAttributesForAPI
+                      },
+                      model: ActorModel,
+                      required: true
+                    }
+                  ]
                 }
               ]
             }
diff --git a/server/models/activitypub/actor.ts b/server/models/activitypub/actor.ts
index 2abf40713..ec0b4b2d9 100644
--- a/server/models/activitypub/actor.ts
+++ b/server/models/activitypub/actor.ts
@@ -42,6 +42,16 @@ enum ScopeNames {
   FULL = 'FULL'
 }
 
+export const unusedActorAttributesForAPI = [
+  'publicKey',
+  'privateKey',
+  'inboxUrl',
+  'outboxUrl',
+  'sharedInboxUrl',
+  'followersUrl',
+  'followingUrl'
+]
+
 @DefaultScope({
   include: [
     {
diff --git a/server/models/video/video-channel.ts b/server/models/video/video-channel.ts
index 9f80e0b8d..7d717fc68 100644
--- a/server/models/video/video-channel.ts
+++ b/server/models/video/video-channel.ts
@@ -12,6 +12,7 @@ import {
   Is,
   Model,
   Scopes,
+  Sequelize,
   Table,
   UpdatedAt
 } from 'sequelize-typescript'
@@ -24,19 +25,36 @@ import {
 } from '../../helpers/custom-validators/video-channels'
 import { sendDeleteActor } from '../../lib/activitypub/send'
 import { AccountModel } from '../account/account'
-import { ActorModel } from '../activitypub/actor'
-import { getSort, throwIfNotValid } from '../utils'
+import { ActorModel, unusedActorAttributesForAPI } from '../activitypub/actor'
+import { buildTrigramSearchIndex, createSimilarityAttribute, getSort, throwIfNotValid } from '../utils'
 import { VideoModel } from './video'
 import { CONSTRAINTS_FIELDS } from '../../initializers'
-import { AvatarModel } from '../avatar/avatar'
 import { ServerModel } from '../server/server'
+import { DefineIndexesOptions } from 'sequelize'
+
+// FIXME: Define indexes here because there is an issue with TS and Sequelize.literal when called directly in the annotation
+const indexes: DefineIndexesOptions[] = [
+  buildTrigramSearchIndex('video_channel_name_trigram', 'name'),
+
+  {
+    fields: [ 'accountId' ]
+  },
+  {
+    fields: [ 'actorId' ]
+  }
+]
 
 enum ScopeNames {
+  AVAILABLE_FOR_LIST = 'AVAILABLE_FOR_LIST',
   WITH_ACCOUNT = 'WITH_ACCOUNT',
   WITH_ACTOR = 'WITH_ACTOR',
   WITH_VIDEOS = 'WITH_VIDEOS'
 }
 
+type AvailableForListOptions = {
+  actorId: number
+}
+
 @DefaultScope({
   include: [
     {
@@ -46,23 +64,57 @@ enum ScopeNames {
   ]
 })
 @Scopes({
-  [ScopeNames.WITH_ACCOUNT]: {
-    include: [
-      {
-        model: () => AccountModel.unscoped(),
-        required: true,
-        include: [
-          {
-            model: () => ActorModel.unscoped(),
-            required: true,
-            include: [
+  [ScopeNames.AVAILABLE_FOR_LIST]: (options: AvailableForListOptions) => {
+    const actorIdNumber = parseInt(options.actorId + '', 10)
+
+    // Only list local channels OR channels that are on an instance followed by actorId
+    const inQueryInstanceFollow = '(' +
+      'SELECT "actor"."serverId" FROM "actor" ' +
+      'INNER JOIN "actorFollow" ON "actorFollow"."targetActorId" = actor.id ' +
+      'WHERE "actorFollow"."actorId" = ' + actorIdNumber +
+    ')'
+
+    return {
+      include: [
+        {
+          attributes: {
+            exclude: unusedActorAttributesForAPI
+          },
+          model: ActorModel,
+          where: {
+            [Sequelize.Op.or]: [
+              {
+                serverId: null
+              },
               {
-                model: () => AvatarModel.unscoped(),
-                required: false
+                serverId: {
+                  [ Sequelize.Op.in ]: Sequelize.literal(inQueryInstanceFollow)
+                }
               }
             ]
           }
-        ]
+        },
+        {
+          model: AccountModel,
+          required: true,
+          include: [
+            {
+              attributes: {
+                exclude: unusedActorAttributesForAPI
+              },
+              model: ActorModel, // Default scope includes avatar and server
+              required: true
+            }
+          ]
+        }
+      ]
+    }
+  },
+  [ScopeNames.WITH_ACCOUNT]: {
+    include: [
+      {
+        model: () => AccountModel,
+        required: true
       }
     ]
   },
@@ -79,14 +131,7 @@ enum ScopeNames {
 })
 @Table({
   tableName: 'videoChannel',
-  indexes: [
-    {
-      fields: [ 'accountId' ]
-    },
-    {
-      fields: [ 'actorId' ]
-    }
-  ]
+  indexes
 })
 export class VideoChannelModel extends Model<VideoChannelModel> {
 
@@ -170,15 +215,61 @@ export class VideoChannelModel extends Model<VideoChannelModel> {
     return VideoChannelModel.count(query)
   }
 
-  static listForApi (start: number, count: number, sort: string) {
+  static listForApi (actorId: number, start: number, count: number, sort: string) {
     const query = {
       offset: start,
       limit: count,
       order: getSort(sort)
     }
 
+    const scopes = {
+      method: [ ScopeNames.AVAILABLE_FOR_LIST, { actorId } as AvailableForListOptions ]
+    }
     return VideoChannelModel
-      .scope([ ScopeNames.WITH_ACTOR, ScopeNames.WITH_ACCOUNT ])
+      .scope(scopes)
+      .findAndCountAll(query)
+      .then(({ rows, count }) => {
+        return { total: count, data: rows }
+      })
+  }
+
+  static searchForApi (options: {
+    actorId: number
+    search: string
+    start: number
+    count: number
+    sort: string
+  }) {
+    const attributesInclude = []
+    const escapedSearch = VideoModel.sequelize.escape(options.search)
+    const escapedLikeSearch = VideoModel.sequelize.escape('%' + options.search + '%')
+    attributesInclude.push(createSimilarityAttribute('VideoChannelModel.name', options.search))
+
+    const query = {
+      attributes: {
+        include: attributesInclude
+      },
+      offset: options.start,
+      limit: options.count,
+      order: getSort(options.sort),
+      where: {
+        id: {
+          [ Sequelize.Op.in ]: Sequelize.literal(
+            '(' +
+              'SELECT id FROM "videoChannel" WHERE ' +
+              'lower(immutable_unaccent("name")) % lower(immutable_unaccent(' + escapedSearch + ')) OR ' +
+              'lower(immutable_unaccent("name")) LIKE lower(immutable_unaccent(' + escapedLikeSearch + '))' +
+            ')'
+          )
+        }
+      }
+    }
+
+    const scopes = {
+      method: [ ScopeNames.AVAILABLE_FOR_LIST, { actorId: options.actorId } as AvailableForListOptions ]
+    }
+    return VideoChannelModel
+      .scope(scopes)
       .findAndCountAll(query)
       .then(({ rows, count }) => {
         return { total: count, data: rows }
@@ -239,7 +330,25 @@ export class VideoChannelModel extends Model<VideoChannelModel> {
     }
 
     return VideoChannelModel
-      .scope([ ScopeNames.WITH_ACTOR, ScopeNames.WITH_ACCOUNT ])
+      .scope([ ScopeNames.WITH_ACCOUNT ])
+      .findOne(query)
+  }
+
+  static loadByUrlAndPopulateAccount (url: string) {
+    const query = {
+      include: [
+        {
+          model: ActorModel,
+          required: true,
+          where: {
+            url
+          }
+        }
+      ]
+    }
+
+    return VideoChannelModel
+      .scope([ ScopeNames.WITH_ACCOUNT ])
       .findOne(query)
   }
 
diff --git a/server/tests/api/check-params/user-subscriptions.ts b/server/tests/api/check-params/user-subscriptions.ts
index 6a6dd9a6f..9fba99ac8 100644
--- a/server/tests/api/check-params/user-subscriptions.ts
+++ b/server/tests/api/check-params/user-subscriptions.ts
@@ -202,6 +202,46 @@ describe('Test user subscriptions API validators', function () {
     })
   })
 
+  describe('When checking if subscriptions exist', async function () {
+    const existPath = path + '/exist'
+
+    it('Should fail with a non authenticated user', async function () {
+      await makeGetRequest({
+        url: server.url,
+        path: existPath,
+        statusCodeExpected: 401
+      })
+    })
+
+    it('Should fail with bad URIs', async function () {
+      await makeGetRequest({
+        url: server.url,
+        path: existPath,
+        query: { uris: 'toto' },
+        token: server.accessToken,
+        statusCodeExpected: 400
+      })
+
+      await makeGetRequest({
+        url: server.url,
+        path: existPath,
+        query: { 'uris[]': 1 },
+        token: server.accessToken,
+        statusCodeExpected: 400
+      })
+    })
+
+    it('Should succeed with the correct parameters', async function () {
+      await makeGetRequest({
+        url: server.url,
+        path: existPath,
+        query: { 'uris[]': 'coucou@localhost:9001' },
+        token: server.accessToken,
+        statusCodeExpected: 200
+      })
+    })
+  })
+
   describe('When removing a subscription', function () {
     it('Should fail with a non authenticated user', async function () {
       await makeDeleteRequest({
diff --git a/server/tests/api/users/user-subscriptions.ts b/server/tests/api/users/user-subscriptions.ts
index cb7d94b0b..65b80540c 100644
--- a/server/tests/api/users/user-subscriptions.ts
+++ b/server/tests/api/users/user-subscriptions.ts
@@ -12,7 +12,7 @@ import {
   listUserSubscriptions,
   listUserSubscriptionVideos,
   removeUserSubscription,
-  getUserSubscription
+  getUserSubscription, areSubscriptionsExist
 } from '../../utils/users/user-subscriptions'
 
 const expect = chai.expect
@@ -128,6 +128,23 @@ describe('Test users subscriptions', function () {
     }
   })
 
+  it('Should return the existing subscriptions', async function () {
+    const uris = [
+      'user3_channel@localhost:9003',
+      'root2_channel@localhost:9001',
+      'root_channel@localhost:9001',
+      'user3_channel@localhost:9001'
+    ]
+
+    const res = await areSubscriptionsExist(servers[ 0 ].url, users[ 0 ].accessToken, uris)
+    const body = res.body
+
+    expect(body['user3_channel@localhost:9003']).to.be.true
+    expect(body['root2_channel@localhost:9001']).to.be.false
+    expect(body['root_channel@localhost:9001']).to.be.true
+    expect(body['user3_channel@localhost:9001']).to.be.false
+  })
+
   it('Should list subscription videos', async function () {
     {
       const res = await listUserSubscriptionVideos(servers[0].url, servers[0].accessToken)
diff --git a/server/tests/utils/users/user-subscriptions.ts b/server/tests/utils/users/user-subscriptions.ts
index 852f590cf..b0e7da7cc 100644
--- a/server/tests/utils/users/user-subscriptions.ts
+++ b/server/tests/utils/users/user-subscriptions.ts
@@ -58,9 +58,22 @@ function removeUserSubscription (url: string, token: string, uri: string, status
   })
 }
 
+function areSubscriptionsExist (url: string, token: string, uris: string[], statusCodeExpected = 200) {
+  const path = '/api/v1/users/me/subscriptions/exist'
+
+  return makeGetRequest({
+    url,
+    path,
+    query: { 'uris[]': uris },
+    token,
+    statusCodeExpected
+  })
+}
+
 // ---------------------------------------------------------------------------
 
 export {
+  areSubscriptionsExist,
   addUserSubscription,
   listUserSubscriptions,
   getUserSubscription,