Users can change ownership of their video [#510] (#888)

* [#510] Create a new route to get the list of user names

To be able to transfer ownership to a user,
we need to be able to select him from the list of users.

Because the list could be too big, we add a autocomplete feature.

This commit does the following:

* Add a API endpoint to get a list of user names by searching its name

* [#510] The user can choose the next owner of the video

To be able to transfer ownership to a user,
we need the owner to be able to select the user.

The server can autocomplete the name of the user to give the ownership.
We add a dialog for the user to actually select it.

This commit does the following:

* Create a modal for the owner to select the next one
* Opens this modal with a button into the menu *more*
* Make the dependency injection

* [#510] When the user choose the next owner, create a request in database

For the change of ownership to happen, we need to store the temporary requests.
When the user make the request, save it to database.

This commit does the following:

* Create the model to persist change ownership requests
* Add an API to manage ownership operations
* Add a route to persist an ownership request

* [#510] A user can fetch its ownership requests sent to him

To be able to accept or refuse a change of ownership,
the user must be able to fetch them.

This commit does the following:

* Add an API to list ownership for a user
* Add the query to database model

* [#510] A user can validate an ownership requests sent to him - server

The user can accept or refuse any ownership request that was sent to him.
This commit focus only on the server part.

This commit does the following:

* Add an API for the user to accept or refuse a video ownership
* Add validators to ensure security access
* Add a query to load a specific video change ownership request

* [#510] A user can validate an ownership requests sent to him - web

The user can accept or refuse any ownership request that was sent to him.
This commit focus only on the web part.

This commit does the following:

* Add a page to list user ownership changes
* Add actions to accept or refuse them
* When accepting, show a modal requiring the channel to send the video

* Correct lint - to squash

* [#510] PR reviews - to squash

This commit does the following:

* Search parameter for user autocompletion is required from middleware directly

* [#510] PR reviews - to squash with creation in database commit

This commit does the following:

* Add the status attribute in model
* Set this attribute on instance creation
* Use AccountModel method `loadLocalByName`

* [#510] PR reviews - to squash with fetch ownership

This commit does the following:

* Add the scope `FULL` for database queries with includes
* Add classic pagination middlewares

* [#510] PR reviews - to squash with ownership validation - server

This commit does the following:

* Add a middleware to validate whether a user can validate an ownership
* Change the ownership status instead of deleting the row

* [#510] PR reviews - to squash with ownership validation - client

This commit does the following:

* Correct indentation of html files with two-spaces indentation
* Use event emitter instead of function for accept event
* Update the sort of ownership change table for a decreasing order by creation date
* Add the status in ownership change table
* Use classic method syntax

* code style - to squash

* Add new user right - to squash

* Move the change to my-account instead of video-watch - to squash

As requested in pull-request, move the action to change ownership into my videos page.

The rest of the logic was not really changed.

This commit does the following:

- Move the modal into my video page
- Create the generic component `button` to keep some styles and logic

* [#510] Add tests for the new feature

To avoid regression, we add tests for all api of ownership change.

This commit does the following:

- Create an end-to-end test for ownership change
- Divide it to one test per request

* [#510] Do not send twice the same request to avoid spam

We can send several time the same request to change ownership.
However, it will spam the user.
To avoid this, we do not save a request already existing in database.

This commit does the following:

- Check whether the request exist in database
- Add tests to verify this new condition

* [#510] Change icons

Change icons so they remains logic with the rest of the application.

This commit does the following:

- Add svg for missing icons
- Add icons in `my-button` component
- Use these new icons

* [#510] Add control about the user quota

The user should be able to accept a new video only if his quota allows it.

This commit does the following:

- Update the middleware to control the quota
- Add tests verifying the control

* Correct merge

- Use new modal system
- Move button to new directory `buttons`

* PR reviews - to squash

12 files changed, 718 insertions, 2 deletions

diff --git a/server/controllers/api/users/index.ts b/server/controllers/api/users/index.ts
index 01ee73a53..faba7e208 100644
--- a/server/controllers/api/users/index.ts
+++ b/server/controllers/api/users/index.ts
@@ -18,6 +18,7 @@ import {
   setDefaultPagination,
   setDefaultSort,
   token,
+  userAutocompleteValidator,
   usersAddValidator,
   usersGetValidator,
   usersRegisterValidator,
@@ -51,6 +52,11 @@ const askSendEmailLimiter = new RateLimit({
 const usersRouter = express.Router()
 usersRouter.use('/', meRouter)
 
+usersRouter.get('/autocomplete',
+  userAutocompleteValidator,
+  asyncMiddleware(autocompleteUsers)
+)
+
 usersRouter.get('/',
   authenticate,
   ensureUserHasRight(UserRight.MANAGE_USERS),
@@ -222,6 +228,12 @@ function getUser (req: express.Request, res: express.Response, next: express.Nex
   return res.json((res.locals.user as UserModel).toFormattedJSON())
 }
 
+async function autocompleteUsers (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const resultList = await UserModel.autocomplete(req.query.search as string)
+
+  return res.json(resultList)
+}
+
 async function listUsers (req: express.Request, res: express.Response, next: express.NextFunction) {
   const resultList = await UserModel.listForApi(req.query.start, req.query.count, req.query.sort)
 
diff --git a/server/controllers/api/videos/index.ts b/server/controllers/api/videos/index.ts
index be803490b..0c9e6c2d1 100644
--- a/server/controllers/api/videos/index.ts
+++ b/server/controllers/api/videos/index.ts
@@ -49,6 +49,7 @@ import { abuseVideoRouter } from './abuse'
 import { blacklistRouter } from './blacklist'
 import { videoCommentRouter } from './comment'
 import { rateVideoRouter } from './rate'
+import { ownershipVideoRouter } from './ownership'
 import { VideoFilter } from '../../../../shared/models/videos/video-query.type'
 import { buildNSFWFilter, createReqFiles } from '../../../helpers/express-utils'
 import { ScheduleVideoUpdateModel } from '../../../models/video/schedule-video-update'
@@ -84,6 +85,7 @@ videosRouter.use('/', rateVideoRouter)
 videosRouter.use('/', videoCommentRouter)
 videosRouter.use('/', videoCaptionsRouter)
 videosRouter.use('/', videoImportsRouter)
+videosRouter.use('/', ownershipVideoRouter)
 
 videosRouter.get('/categories', listVideoCategories)
 videosRouter.get('/licences', listVideoLicences)
diff --git a/server/controllers/api/videos/ownership.ts b/server/controllers/api/videos/ownership.ts
new file mode 100644
index 000000000..fc42f5fff
--- /dev/null
+++ b/server/controllers/api/videos/ownership.ts
@@ -0,0 +1,117 @@
+import * as express from 'express'
+import { logger } from '../../../helpers/logger'
+import { sequelizeTypescript } from '../../../initializers'
+import {
+  asyncMiddleware,
+  asyncRetryTransactionMiddleware,
+  authenticate,
+  paginationValidator,
+  setDefaultPagination,
+  videosAcceptChangeOwnershipValidator,
+  videosChangeOwnershipValidator,
+  videosTerminateChangeOwnershipValidator
+} from '../../../middlewares'
+import { AccountModel } from '../../../models/account/account'
+import { VideoModel } from '../../../models/video/video'
+import { VideoChangeOwnershipModel } from '../../../models/video/video-change-ownership'
+import { VideoChangeOwnershipStatus } from '../../../../shared/models/videos'
+import { VideoChannelModel } from '../../../models/video/video-channel'
+import { getFormattedObjects } from '../../../helpers/utils'
+
+const ownershipVideoRouter = express.Router()
+
+ownershipVideoRouter.post('/:videoId/give-ownership',
+  authenticate,
+  asyncMiddleware(videosChangeOwnershipValidator),
+  asyncRetryTransactionMiddleware(giveVideoOwnership)
+)
+
+ownershipVideoRouter.get('/ownership',
+  authenticate,
+  paginationValidator,
+  setDefaultPagination,
+  asyncRetryTransactionMiddleware(listVideoOwnership)
+)
+
+ownershipVideoRouter.post('/ownership/:id/accept',
+  authenticate,
+  asyncMiddleware(videosTerminateChangeOwnershipValidator),
+  asyncMiddleware(videosAcceptChangeOwnershipValidator),
+  asyncRetryTransactionMiddleware(acceptOwnership)
+)
+
+ownershipVideoRouter.post('/ownership/:id/refuse',
+  authenticate,
+  asyncMiddleware(videosTerminateChangeOwnershipValidator),
+  asyncRetryTransactionMiddleware(refuseOwnership)
+)
+
+// ---------------------------------------------------------------------------
+
+export {
+  ownershipVideoRouter
+}
+
+// ---------------------------------------------------------------------------
+
+async function giveVideoOwnership (req: express.Request, res: express.Response) {
+  const videoInstance = res.locals.video as VideoModel
+  const initiatorAccount = res.locals.oauth.token.User.Account as AccountModel
+  const nextOwner = res.locals.nextOwner as AccountModel
+
+  await sequelizeTypescript.transaction(async t => {
+    await VideoChangeOwnershipModel.findOrCreate({
+      where: {
+        initiatorAccountId: initiatorAccount.id,
+        nextOwnerAccountId: nextOwner.id,
+        videoId: videoInstance.id,
+        status: VideoChangeOwnershipStatus.WAITING
+      },
+      defaults: {
+        initiatorAccountId: initiatorAccount.id,
+        nextOwnerAccountId: nextOwner.id,
+        videoId: videoInstance.id,
+        status: VideoChangeOwnershipStatus.WAITING
+      }
+    })
+    logger.info('Ownership change for video %s created.', videoInstance.name)
+    return res.type('json').status(204).end()
+  })
+}
+
+async function listVideoOwnership (req: express.Request, res: express.Response) {
+  const currentAccount = res.locals.oauth.token.User.Account as AccountModel
+  const resultList = await VideoChangeOwnershipModel.listForApi(
+    currentAccount.id,
+    req.query.start || 0,
+    req.query.count || 10,
+    req.query.sort || 'createdAt'
+  )
+
+  return res.json(getFormattedObjects(resultList.data, resultList.total))
+}
+
+async function acceptOwnership (req: express.Request, res: express.Response) {
+  return sequelizeTypescript.transaction(async t => {
+    const videoChangeOwnership = res.locals.videoChangeOwnership as VideoChangeOwnershipModel
+    const targetVideo = videoChangeOwnership.Video
+    const channel = res.locals.videoChannel as VideoChannelModel
+
+    targetVideo.set('channelId', channel.id)
+
+    await targetVideo.save()
+    videoChangeOwnership.set('status', VideoChangeOwnershipStatus.ACCEPTED)
+    await videoChangeOwnership.save()
+
+    return res.sendStatus(204)
+  })
+}
+
+async function refuseOwnership (req: express.Request, res: express.Response) {
+  return sequelizeTypescript.transaction(async t => {
+    const videoChangeOwnership = res.locals.videoChangeOwnership as VideoChangeOwnershipModel
+    videoChangeOwnership.set('status', VideoChangeOwnershipStatus.REFUSED)
+    await videoChangeOwnership.save()
+    return res.sendStatus(204)
+  })
+}
diff --git a/server/helpers/custom-validators/video-ownership.ts b/server/helpers/custom-validators/video-ownership.ts
new file mode 100644
index 000000000..aaa0c736b
--- /dev/null
+++ b/server/helpers/custom-validators/video-ownership.ts
@@ -0,0 +1,42 @@
+import { Response } from 'express'
+import * as validator from 'validator'
+import { VideoChangeOwnershipModel } from '../../models/video/video-change-ownership'
+import { UserModel } from '../../models/account/user'
+
+export async function doesChangeVideoOwnershipExist (id: string, res: Response): Promise<boolean> {
+  const videoChangeOwnership = await loadVideoChangeOwnership(id)
+
+  if (!videoChangeOwnership) {
+    res.status(404)
+      .json({ error: 'Video change ownership not found' })
+      .end()
+
+    return false
+  }
+
+  res.locals.videoChangeOwnership = videoChangeOwnership
+  return true
+}
+
+async function loadVideoChangeOwnership (id: string): Promise<VideoChangeOwnershipModel | undefined> {
+  if (validator.isInt(id)) {
+    return VideoChangeOwnershipModel.load(parseInt(id, 10))
+  }
+
+  return undefined
+}
+
+export function checkUserCanTerminateOwnershipChange (
+  user: UserModel,
+  videoChangeOwnership: VideoChangeOwnershipModel,
+  res: Response
+): boolean {
+  if (videoChangeOwnership.NextOwner.userId === user.Account.userId) {
+    return true
+  }
+
+  res.status(403)
+    .json({ error: 'Cannot terminate an ownership change of another user' })
+    .end()
+  return false
+}
diff --git a/server/initializers/database.ts b/server/initializers/database.ts
index 78bc8101c..b68e1a882 100644
--- a/server/initializers/database.ts
+++ b/server/initializers/database.ts
@@ -26,6 +26,7 @@ import { ScheduleVideoUpdateModel } from '../models/video/schedule-video-update'
 import { VideoCaptionModel } from '../models/video/video-caption'
 import { VideoImportModel } from '../models/video/video-import'
 import { VideoViewModel } from '../models/video/video-views'
+import { VideoChangeOwnershipModel } from '../models/video/video-change-ownership'
 
 require('pg').defaults.parseInt8 = true // Avoid BIGINT to be converted to string
 
@@ -75,6 +76,7 @@ async function initDatabaseModels (silent: boolean) {
     AccountVideoRateModel,
     UserModel,
     VideoAbuseModel,
+    VideoChangeOwnershipModel,
     VideoChannelModel,
     VideoShareModel,
     VideoFileModel,
diff --git a/server/middlewares/validators/users.ts b/server/middlewares/validators/users.ts
index a595c39ec..d13c50c84 100644
--- a/server/middlewares/validators/users.ts
+++ b/server/middlewares/validators/users.ts
@@ -290,6 +290,10 @@ const usersVerifyEmailValidator = [
   }
 ]
 
+const userAutocompleteValidator = [
+  param('search').isString().not().isEmpty().withMessage('Should have a search parameter')
+]
+
 // ---------------------------------------------------------------------------
 
 export {
@@ -307,7 +311,8 @@ export {
   usersAskResetPasswordValidator,
   usersResetPasswordValidator,
   usersAskSendVerifyEmailValidator,
-  usersVerifyEmailValidator
+  usersVerifyEmailValidator,
+  userAutocompleteValidator
 }
 
 // ---------------------------------------------------------------------------
diff --git a/server/middlewares/validators/videos.ts b/server/middlewares/validators/videos.ts
index a2c866152..9befbc9ee 100644
--- a/server/middlewares/validators/videos.ts
+++ b/server/middlewares/validators/videos.ts
@@ -1,7 +1,7 @@
 import * as express from 'express'
 import 'express-validator'
 import { body, param, ValidationChain } from 'express-validator/check'
-import { UserRight, VideoPrivacy } from '../../../shared'
+import { UserRight, VideoChangeOwnershipStatus, VideoPrivacy } from '../../../shared'
 import {
   isBooleanValid,
   isDateValid,
@@ -37,6 +37,10 @@ import { areValidationErrors } from './utils'
 import { cleanUpReqFiles } from '../../helpers/express-utils'
 import { VideoModel } from '../../models/video/video'
 import { UserModel } from '../../models/account/user'
+import { checkUserCanTerminateOwnershipChange, doesChangeVideoOwnershipExist } from '../../helpers/custom-validators/video-ownership'
+import { VideoChangeOwnershipAccept } from '../../../shared/models/videos/video-change-ownership-accept.model'
+import { VideoChangeOwnershipModel } from '../../models/video/video-change-ownership'
+import { AccountModel } from '../../models/account/account'
 
 const videosAddValidator = getCommonVideoAttributes().concat([
   body('videofile')
@@ -217,6 +221,78 @@ const videosShareValidator = [
   }
 ]
 
+const videosChangeOwnershipValidator = [
+  param('videoId').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
+
+  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    logger.debug('Checking changeOwnership parameters', { parameters: req.params })
+
+    if (areValidationErrors(req, res)) return
+    if (!await isVideoExist(req.params.videoId, res)) return
+
+    // Check if the user who did the request is able to change the ownership of the video
+    if (!checkUserCanManageVideo(res.locals.oauth.token.User, res.locals.video, UserRight.CHANGE_VIDEO_OWNERSHIP, res)) return
+
+    const nextOwner = await AccountModel.loadLocalByName(req.body.username)
+    if (!nextOwner) {
+      res.status(400)
+        .type('json')
+        .end()
+      return
+    }
+    res.locals.nextOwner = nextOwner
+
+    return next()
+  }
+]
+
+const videosTerminateChangeOwnershipValidator = [
+  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
+
+  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    logger.debug('Checking changeOwnership parameters', { parameters: req.params })
+
+    if (areValidationErrors(req, res)) return
+    if (!await doesChangeVideoOwnershipExist(req.params.id, res)) return
+
+    // Check if the user who did the request is able to change the ownership of the video
+    if (!checkUserCanTerminateOwnershipChange(res.locals.oauth.token.User, res.locals.videoChangeOwnership, res)) return
+
+    return next()
+  },
+  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    const videoChangeOwnership = res.locals.videoChangeOwnership as VideoChangeOwnershipModel
+
+    if (videoChangeOwnership.status === VideoChangeOwnershipStatus.WAITING) {
+      return next()
+    } else {
+      res.status(403)
+        .json({ error: 'Ownership already accepted or refused' })
+        .end()
+      return
+    }
+  }
+]
+
+const videosAcceptChangeOwnershipValidator = [
+  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    const body = req.body as VideoChangeOwnershipAccept
+    if (!await isVideoChannelOfAccountExist(body.channelId, res.locals.oauth.token.User, res)) return
+
+    const user = res.locals.oauth.token.User
+    const videoChangeOwnership = res.locals.videoChangeOwnership as VideoChangeOwnershipModel
+    const isAble = await user.isAbleToUploadVideo(videoChangeOwnership.Video.getOriginalFile())
+    if (isAble === false) {
+      res.status(403)
+        .json({ error: 'The user video quota is exceeded with this video.' })
+        .end()
+      return
+    }
+
+    return next()
+  }
+]
+
 function getCommonVideoAttributes () {
   return [
     body('thumbnailfile')
@@ -295,6 +371,10 @@ export {
 
   videoRateValidator,
 
+  videosChangeOwnershipValidator,
+  videosTerminateChangeOwnershipValidator,
+  videosAcceptChangeOwnershipValidator,
+
   getCommonVideoAttributes
 }
 
diff --git a/server/models/account/user.ts b/server/models/account/user.ts
index 89265774b..4b13e47a0 100644
--- a/server/models/account/user.ts
+++ b/server/models/account/user.ts
@@ -39,6 +39,7 @@ import { AccountModel } from './account'
 import { NSFWPolicyType } from '../../../shared/models/videos/nsfw-policy.type'
 import { values } from 'lodash'
 import { NSFW_POLICY_TYPES } from '../../initializers'
+import { VideoFileModel } from '../video/video-file'
 
 enum ScopeNames {
   WITH_VIDEO_CHANNEL = 'WITH_VIDEO_CHANNEL'
@@ -393,4 +394,15 @@ export class UserModel extends Model<UserModel> {
                       return parseInt(total, 10)
                     })
   }
+
+  static autocomplete (search: string) {
+    return UserModel.findAll({
+      where: {
+        username: {
+          [Sequelize.Op.like]: `%${search}%`
+        }
+      }
+    })
+      .then(u => u.map(u => u.username))
+  }
 }
diff --git a/server/models/video/video-change-ownership.ts b/server/models/video/video-change-ownership.ts
new file mode 100644
index 000000000..c9cff5054
--- /dev/null
+++ b/server/models/video/video-change-ownership.ts
@@ -0,0 +1,127 @@
+import { AllowNull, BelongsTo, Column, CreatedAt, ForeignKey, Model, Scopes, Table, UpdatedAt } from 'sequelize-typescript'
+import { AccountModel } from '../account/account'
+import { VideoModel } from './video'
+import { VideoChangeOwnership, VideoChangeOwnershipStatus } from '../../../shared/models/videos'
+import { getSort } from '../utils'
+import { VideoFileModel } from './video-file'
+
+enum ScopeNames {
+  FULL = 'FULL'
+}
+
+@Table({
+  tableName: 'videoChangeOwnership',
+  indexes: [
+    {
+      fields: ['videoId']
+    },
+    {
+      fields: ['initiatorAccountId']
+    },
+    {
+      fields: ['nextOwnerAccountId']
+    }
+  ]
+})
+@Scopes({
+  [ScopeNames.FULL]: {
+    include: [
+      {
+        model: () => AccountModel,
+        as: 'Initiator',
+        required: true
+      },
+      {
+        model: () => AccountModel,
+        as: 'NextOwner',
+        required: true
+      },
+      {
+        model: () => VideoModel,
+        required: true,
+        include: [{ model: () => VideoFileModel }]
+      }
+    ]
+  }
+})
+export class VideoChangeOwnershipModel extends Model<VideoChangeOwnershipModel> {
+  @CreatedAt
+  createdAt: Date
+
+  @UpdatedAt
+  updatedAt: Date
+
+  @AllowNull(false)
+  @Column
+  status: VideoChangeOwnershipStatus
+
+  @ForeignKey(() => AccountModel)
+  @Column
+  initiatorAccountId: number
+
+  @BelongsTo(() => AccountModel, {
+    foreignKey: {
+      name: 'initiatorAccountId',
+      allowNull: false
+    },
+    onDelete: 'cascade'
+  })
+  Initiator: AccountModel
+
+  @ForeignKey(() => AccountModel)
+  @Column
+  nextOwnerAccountId: number
+
+  @BelongsTo(() => AccountModel, {
+    foreignKey: {
+      name: 'nextOwnerAccountId',
+      allowNull: false
+    },
+    onDelete: 'cascade'
+  })
+  NextOwner: AccountModel
+
+  @ForeignKey(() => VideoModel)
+  @Column
+  videoId: number
+
+  @BelongsTo(() => VideoModel, {
+    foreignKey: {
+      allowNull: false
+    },
+    onDelete: 'cascade'
+  })
+  Video: VideoModel
+
+  static listForApi (nextOwnerId: number, start: number, count: number, sort: string) {
+    return VideoChangeOwnershipModel.scope(ScopeNames.FULL).findAndCountAll({
+      offset: start,
+      limit: count,
+      order: getSort(sort),
+      where: {
+        nextOwnerAccountId: nextOwnerId
+      }
+    })
+      .then(({ rows, count }) => ({ total: count, data: rows }))
+  }
+
+  static load (id: number) {
+    return VideoChangeOwnershipModel.scope(ScopeNames.FULL).findById(id)
+  }
+
+  toFormattedJSON (): VideoChangeOwnership {
+    return {
+      id: this.id,
+      status: this.status,
+      initiatorAccount: this.Initiator.toFormattedJSON(),
+      nextOwnerAccount: this.NextOwner.toFormattedJSON(),
+      video: {
+        id: this.Video.id,
+        uuid: this.Video.uuid,
+        url: this.Video.url,
+        name: this.Video.name
+      },
+      createdAt: this.createdAt
+    }
+  }
+}
diff --git a/server/tests/api/videos/video-change-ownership.ts b/server/tests/api/videos/video-change-ownership.ts
new file mode 100644
index 000000000..275be40be
--- /dev/null
+++ b/server/tests/api/videos/video-change-ownership.ts
@@ -0,0 +1,262 @@
+/* tslint:disable:no-unused-expression */
+
+import * as chai from 'chai'
+import 'mocha'
+import {
+  acceptChangeOwnership,
+  changeVideoOwnership,
+  createUser,
+  flushTests,
+  getMyUserInformation,
+  getVideoChangeOwnershipList,
+  getVideosList,
+  killallServers,
+  refuseChangeOwnership,
+  runServer,
+  ServerInfo,
+  setAccessTokensToServers,
+  uploadVideo,
+  userLogin
+} from '../../utils'
+import { waitJobs } from '../../utils/server/jobs'
+import { User } from '../../../../shared/models/users'
+
+const expect = chai.expect
+
+describe('Test video change ownership - nominal', function () {
+  let server: ServerInfo = undefined
+  const firstUser = {
+    username: 'first',
+    password: 'My great password'
+  }
+  const secondUser = {
+    username: 'second',
+    password: 'My other password'
+  }
+  let firstUserAccessToken = ''
+  let secondUserAccessToken = ''
+  let lastRequestChangeOwnershipId = undefined
+
+  before(async function () {
+    this.timeout(50000)
+
+    // Run one server
+    await flushTests()
+    server = await runServer(1)
+    await setAccessTokensToServers([server])
+
+    const videoQuota = 42000000
+    await createUser(server.url, server.accessToken, firstUser.username, firstUser.password, videoQuota)
+    await createUser(server.url, server.accessToken, secondUser.username, secondUser.password, videoQuota)
+
+    firstUserAccessToken = await userLogin(server, firstUser)
+    secondUserAccessToken = await userLogin(server, secondUser)
+
+    // Upload some videos on the server
+    const video1Attributes = {
+      name: 'my super name',
+      description: 'my super description'
+    }
+    await uploadVideo(server.url, firstUserAccessToken, video1Attributes)
+
+    await waitJobs(server)
+
+    const res = await getVideosList(server.url)
+    const videos = res.body.data
+
+    expect(videos.length).to.equal(1)
+
+    server.video = videos.find(video => video.name === 'my super name')
+  })
+
+  it('Should not have video change ownership', async function () {
+    const resFirstUser = await getVideoChangeOwnershipList(server.url, firstUserAccessToken)
+
+    expect(resFirstUser.body.total).to.equal(0)
+    expect(resFirstUser.body.data).to.be.an('array')
+    expect(resFirstUser.body.data.length).to.equal(0)
+
+    const resSecondUser = await getVideoChangeOwnershipList(server.url, secondUserAccessToken)
+
+    expect(resSecondUser.body.total).to.equal(0)
+    expect(resSecondUser.body.data).to.be.an('array')
+    expect(resSecondUser.body.data.length).to.equal(0)
+  })
+
+  it('Should send a request to change ownership of a video', async function () {
+    this.timeout(15000)
+
+    await changeVideoOwnership(server.url, firstUserAccessToken, server.video.id, secondUser.username)
+  })
+
+  it('Should only return a request to change ownership for the second user', async function () {
+    const resFirstUser = await getVideoChangeOwnershipList(server.url, firstUserAccessToken)
+
+    expect(resFirstUser.body.total).to.equal(0)
+    expect(resFirstUser.body.data).to.be.an('array')
+    expect(resFirstUser.body.data.length).to.equal(0)
+
+    const resSecondUser = await getVideoChangeOwnershipList(server.url, secondUserAccessToken)
+
+    expect(resSecondUser.body.total).to.equal(1)
+    expect(resSecondUser.body.data).to.be.an('array')
+    expect(resSecondUser.body.data.length).to.equal(1)
+
+    lastRequestChangeOwnershipId = resSecondUser.body.data[0].id
+  })
+
+  it('Should accept the same change ownership request without crashing', async function () {
+    this.timeout(10000)
+
+    await changeVideoOwnership(server.url, firstUserAccessToken, server.video.id, secondUser.username)
+  })
+
+  it('Should not create multiple change ownership requests while one is waiting', async function () {
+    this.timeout(10000)
+
+    const resSecondUser = await getVideoChangeOwnershipList(server.url, secondUserAccessToken)
+
+    expect(resSecondUser.body.total).to.equal(1)
+    expect(resSecondUser.body.data).to.be.an('array')
+    expect(resSecondUser.body.data.length).to.equal(1)
+  })
+
+  it('Should not be possible to refuse the change of ownership from first user', async function () {
+    this.timeout(10000)
+
+    await refuseChangeOwnership(server.url, firstUserAccessToken, lastRequestChangeOwnershipId, 403)
+  })
+
+  it('Should be possible to refuse the change of ownership from second user', async function () {
+    this.timeout(10000)
+
+    await refuseChangeOwnership(server.url, secondUserAccessToken, lastRequestChangeOwnershipId)
+  })
+
+  it('Should send a new request to change ownership of a video', async function () {
+    this.timeout(15000)
+
+    await changeVideoOwnership(server.url, firstUserAccessToken, server.video.id, secondUser.username)
+  })
+
+  it('Should return two requests to change ownership for the second user', async function () {
+    const resFirstUser = await getVideoChangeOwnershipList(server.url, firstUserAccessToken)
+
+    expect(resFirstUser.body.total).to.equal(0)
+    expect(resFirstUser.body.data).to.be.an('array')
+    expect(resFirstUser.body.data.length).to.equal(0)
+
+    const resSecondUser = await getVideoChangeOwnershipList(server.url, secondUserAccessToken)
+
+    expect(resSecondUser.body.total).to.equal(2)
+    expect(resSecondUser.body.data).to.be.an('array')
+    expect(resSecondUser.body.data.length).to.equal(2)
+
+    lastRequestChangeOwnershipId = resSecondUser.body.data[0].id
+  })
+
+  it('Should not be possible to accept the change of ownership from first user', async function () {
+    this.timeout(10000)
+
+    const secondUserInformationResponse = await getMyUserInformation(server.url, secondUserAccessToken)
+    const secondUserInformation: User = secondUserInformationResponse.body
+    const channelId = secondUserInformation.videoChannels[0].id
+    await acceptChangeOwnership(server.url, firstUserAccessToken, lastRequestChangeOwnershipId, channelId, 403)
+  })
+
+  it('Should be possible to accept the change of ownership from second user', async function () {
+    this.timeout(10000)
+
+    const secondUserInformationResponse = await getMyUserInformation(server.url, secondUserAccessToken)
+    const secondUserInformation: User = secondUserInformationResponse.body
+    const channelId = secondUserInformation.videoChannels[0].id
+    await acceptChangeOwnership(server.url, secondUserAccessToken, lastRequestChangeOwnershipId, channelId)
+  })
+
+  after(async function () {
+    killallServers([server])
+  })
+})
+
+describe('Test video change ownership - quota too small', function () {
+  let server: ServerInfo = undefined
+  const firstUser = {
+    username: 'first',
+    password: 'My great password'
+  }
+  const secondUser = {
+    username: 'second',
+    password: 'My other password'
+  }
+  let firstUserAccessToken = ''
+  let secondUserAccessToken = ''
+  let lastRequestChangeOwnershipId = undefined
+
+  before(async function () {
+    this.timeout(50000)
+
+    // Run one server
+    await flushTests()
+    server = await runServer(1)
+    await setAccessTokensToServers([server])
+
+    const videoQuota = 42000000
+    const limitedVideoQuota = 10
+    await createUser(server.url, server.accessToken, firstUser.username, firstUser.password, videoQuota)
+    await createUser(server.url, server.accessToken, secondUser.username, secondUser.password, limitedVideoQuota)
+
+    firstUserAccessToken = await userLogin(server, firstUser)
+    secondUserAccessToken = await userLogin(server, secondUser)
+
+    // Upload some videos on the server
+    const video1Attributes = {
+      name: 'my super name',
+      description: 'my super description'
+    }
+    await uploadVideo(server.url, firstUserAccessToken, video1Attributes)
+
+    await waitJobs(server)
+
+    const res = await getVideosList(server.url)
+    const videos = res.body.data
+
+    expect(videos.length).to.equal(1)
+
+    server.video = videos.find(video => video.name === 'my super name')
+  })
+
+  it('Should send a request to change ownership of a video', async function () {
+    this.timeout(15000)
+
+    await changeVideoOwnership(server.url, firstUserAccessToken, server.video.id, secondUser.username)
+  })
+
+  it('Should only return a request to change ownership for the second user', async function () {
+    const resFirstUser = await getVideoChangeOwnershipList(server.url, firstUserAccessToken)
+
+    expect(resFirstUser.body.total).to.equal(0)
+    expect(resFirstUser.body.data).to.be.an('array')
+    expect(resFirstUser.body.data.length).to.equal(0)
+
+    const resSecondUser = await getVideoChangeOwnershipList(server.url, secondUserAccessToken)
+
+    expect(resSecondUser.body.total).to.equal(1)
+    expect(resSecondUser.body.data).to.be.an('array')
+    expect(resSecondUser.body.data.length).to.equal(1)
+
+    lastRequestChangeOwnershipId = resSecondUser.body.data[0].id
+  })
+
+  it('Should not be possible to accept the change of ownership from second user because of exceeded quota', async function () {
+    this.timeout(10000)
+
+    const secondUserInformationResponse = await getMyUserInformation(server.url, secondUserAccessToken)
+    const secondUserInformation: User = secondUserInformationResponse.body
+    const channelId = secondUserInformation.videoChannels[0].id
+    await acceptChangeOwnership(server.url, secondUserAccessToken, lastRequestChangeOwnershipId, channelId, 403)
+  })
+
+  after(async function () {
+    killallServers([server])
+  })
+})
diff --git a/server/tests/utils/index.ts b/server/tests/utils/index.ts
index 391db18cf..897389824 100644
--- a/server/tests/utils/index.ts
+++ b/server/tests/utils/index.ts
@@ -13,5 +13,6 @@ export * from './videos/video-abuses'
 export * from './videos/video-blacklist'
 export * from './videos/video-channels'
 export * from './videos/videos'
+export * from './videos/video-change-ownership'
 export * from './feeds/feeds'
 export * from './search/videos'
diff --git a/server/tests/utils/videos/video-change-ownership.ts b/server/tests/utils/videos/video-change-ownership.ts
new file mode 100644
index 000000000..f288692ea
--- /dev/null
+++ b/server/tests/utils/videos/video-change-ownership.ts
@@ -0,0 +1,54 @@
+import * as request from 'supertest'
+
+function changeVideoOwnership (url: string, token: string, videoId: number | string, username) {
+  const path = '/api/v1/videos/' + videoId + '/give-ownership'
+
+  return request(url)
+    .post(path)
+    .set('Accept', 'application/json')
+    .set('Authorization', 'Bearer ' + token)
+    .send({ username })
+    .expect(204)
+}
+
+function getVideoChangeOwnershipList (url: string, token: string) {
+  const path = '/api/v1/videos/ownership'
+
+  return request(url)
+    .get(path)
+    .query({ sort: '-createdAt' })
+    .set('Accept', 'application/json')
+    .set('Authorization', 'Bearer ' + token)
+    .expect(200)
+    .expect('Content-Type', /json/)
+}
+
+function acceptChangeOwnership (url: string, token: string, ownershipId: string, channelId: number, expectedStatus = 204) {
+  const path = '/api/v1/videos/ownership/' + ownershipId + '/accept'
+
+  return request(url)
+    .post(path)
+    .set('Accept', 'application/json')
+    .set('Authorization', 'Bearer ' + token)
+    .send({ channelId })
+    .expect(expectedStatus)
+}
+
+function refuseChangeOwnership (url: string, token: string, ownershipId: string, expectedStatus = 204) {
+  const path = '/api/v1/videos/ownership/' + ownershipId + '/refuse'
+
+  return request(url)
+    .post(path)
+    .set('Accept', 'application/json')
+    .set('Authorization', 'Bearer ' + token)
+    .expect(expectedStatus)
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  changeVideoOwnership,
+  getVideoChangeOwnershipList,
+  acceptChangeOwnership,
+  refuseChangeOwnership
+}