Add ability for an administrator to remove any video (#61)

* Add ability for an admin to remove every video on the pod.

* Server: add BlacklistedVideos relation.

* Server: Insert in BlacklistedVideos relation upon deletion of a video.

* Server: Modify BlacklistedVideos schema to add Pod id information.

* Server: Moving insertion of a blacklisted video from the `afterDestroy` hook into the process of deletion of a video.

To avoid inserting a video when it is removed on its origin pod.
When a video is removed on its origin pod, the `afterDestroy` hook is fire, but no request is made on the delete('/:videoId') interface.
Hence, we insert into `BlacklistedVideos` only on request on delete('/:videoId') (if requirements for insertion are met).

* Server: Add removeVideoFromBlacklist hook on deletion of a video.

We are going to proceed in another way :).
We will add a new route : /:videoId/blacklist to blacklist a video.
We do not blacklist a video upon its deletion now (to distinguish a video blacklist from a regular video delete)
When we blacklist a video, the video remains in the DB, so we don't have any concern about its update. It just doesn't appear in the video list.
When we remove a video, we then have to remove it from the blacklist too.
We could also remove a video from the blacklist to 'unremove' it and make it appear again in the video list (will be another feature).

* Server: Add handler for new route post(/:videoId/blacklist)

* Client: Add isBlacklistable method

* Client: Update isRemovableBy method.

* Client: Move 'Delete video' feature from the video-list to the video-watch module.

* Server: Exclude blacklisted videos from the video list

* Server: Use findAll() in BlacklistedVideos.list() method

* Server: Fix addVideoToBlacklist function.

* Client: Add blacklist feature.

* Server: Use JavaScript Standard Style.

* Server: In checkUserCanDeleteVideo, move the callback call inside the db callback function

* Server: Modify BlacklistVideo relation

* Server: Modifiy Videos methods.

* Server: Add checkVideoIsBlacklistable method

* Server: Rewrite addVideoToBlacklist method

* Server: Fix checkVideoIsBlacklistable method

* Server: Add return to addVideoToBlacklist method

1 files changed, 53 insertions, 10 deletions

diff --git a/server/middlewares/validators/videos.js b/server/middlewares/validators/videos.js
index c07825e50..86a7e39ae 100644
--- a/server/middlewares/validators/videos.js
+++ b/server/middlewares/validators/videos.js
@@ -15,7 +15,9 @@ const validatorsVideos = {
 
   videoAbuseReport,
 
-  videoRate
+  videoRate,
+
+  videosBlacklist
 }
 
 function videosAdd (req, res, next) {
@@ -95,15 +97,10 @@ function videosRemove (req, res, next) {
     checkVideoExists(req.params.id, res, function () {
       // We need to make additional checks
 
-      if (res.locals.video.isOwned() === false) {
-        return res.status(403).send('Cannot remove video of another pod')
-      }
-
-      if (res.locals.video.Author.userId !== res.locals.oauth.token.User.id) {
-        return res.status(403).send('Cannot remove video of another user')
-      }
-
-      next()
+      // Check if the user who did the request is able to delete the video
+      checkUserCanDeleteVideo(res.locals.oauth.token.User.id, res, function () {
+        next()
+      })
     })
   })
 }
@@ -159,3 +156,49 @@ function checkVideoExists (id, res, callback) {
     callback()
   })
 }
+
+function checkUserCanDeleteVideo (userId, res, callback) {
+  // Retrieve the user who did the request
+  db.User.loadById(userId, function (err, user) {
+    if (err) {
+      logger.error('Error in video request validator.', { error: err })
+      return res.sendStatus(500)
+    }
+
+    // Check if the user can delete the video
+    //  The user can delete it if s/he an admin
+    //  Or if s/he is the video's author
+    if (user.isAdmin() === false) {
+      if (res.locals.video.isOwned() === false) {
+        return res.status(403).send('Cannot remove video of another pod')
+      }
+
+      if (res.locals.video.Author.userId !== res.locals.oauth.token.User.id) {
+        return res.status(403).send('Cannot remove video of another user')
+      }
+    }
+
+    // If we reach this comment, we can delete the video
+    callback()
+  })
+}
+
+function checkVideoIsBlacklistable (req, res, callback) {
+  if (res.locals.video.isOwned() === true) {
+        return res.status(403).send('Cannot blacklist a local video')
+  }
+
+  callback()
+}
+
+function videosBlacklist (req, res, next) {
+  req.checkParams('id', 'Should have a valid id').notEmpty().isUUID(4)
+
+  logger.debug('Checking videosBlacklist parameters', { parameters: req.params })
+
+  checkErrors(req, res, function () {
+    checkVideoExists(req.params.id, res, function() {
+      checkVideoIsBlacklistable(req, res, next)
+    })
+  })
+}