2 files changed, 57 insertions, 11 deletions

diff --git a/server/middlewares/oauth.ts b/server/middlewares/oauth.ts
index 5233b66bd..8c1df2c3e 100644
--- a/server/middlewares/oauth.ts
+++ b/server/middlewares/oauth.ts
@@ -28,9 +28,24 @@ function authenticate (req: express.Request, res: express.Response, next: expres
   })
 }
 
+function authenticatePromiseIfNeeded (req: express.Request, res: express.Response) {
+  return new Promise(resolve => {
+    // Already authenticated? (or tried to)
+    if (res.locals.oauth && res.locals.oauth.token.User) return resolve()
+
+    if (res.locals.authenticated === false) return res.sendStatus(401)
+
+    authenticate(req, res, () => {
+      return resolve()
+    })
+  })
+}
+
 function optionalAuthenticate (req: express.Request, res: express.Response, next: express.NextFunction) {
   if (req.header('authorization')) return authenticate(req, res, next)
 
+  res.locals.authenticated = false
+
   return next()
 }
 
@@ -53,6 +68,7 @@ function token (req: express.Request, res: express.Response, next: express.NextF
 
 export {
   authenticate,
+  authenticatePromiseIfNeeded,
   optionalAuthenticate,
   token
 }
diff --git a/server/middlewares/validators/videos/videos.ts b/server/middlewares/validators/videos/videos.ts
index bf21bca8c..051a19e16 100644
--- a/server/middlewares/validators/videos/videos.ts
+++ b/server/middlewares/validators/videos/videos.ts
@@ -31,8 +31,8 @@ import {
 } from '../../../helpers/custom-validators/videos'
 import { getDurationFromVideoFile } from '../../../helpers/ffmpeg-utils'
 import { logger } from '../../../helpers/logger'
-import { CONSTRAINTS_FIELDS } from '../../../initializers'
-import { authenticate } from '../../oauth'
+import { CONFIG, CONSTRAINTS_FIELDS } from '../../../initializers'
+import { authenticatePromiseIfNeeded } from '../../oauth'
 import { areValidationErrors } from '../utils'
 import { cleanUpReqFiles } from '../../../helpers/express-utils'
 import { VideoModel } from '../../../models/video/video'
@@ -43,6 +43,7 @@ import { VideoChangeOwnershipModel } from '../../../models/video/video-change-ow
 import { AccountModel } from '../../../models/account/account'
 import { VideoFetchType } from '../../../helpers/video'
 import { isNSFWQueryValid, isNumberArray, isStringArray } from '../../../helpers/custom-validators/search'
+import { getServerActor } from '../../../helpers/utils'
 
 const videosAddValidator = getCommonVideoAttributes().concat([
   body('videofile')
@@ -127,6 +128,31 @@ const videosUpdateValidator = getCommonVideoAttributes().concat([
   }
 ])
 
+async function checkVideoFollowConstraints (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const video: VideoModel = res.locals.video
+
+  // Anybody can watch local videos
+  if (video.isOwned() === true) return next()
+
+  // Logged user
+  if (res.locals.oauth) {
+    // Users can search or watch remote videos
+    if (CONFIG.SEARCH.REMOTE_URI.USERS === true) return next()
+  }
+
+  // Anybody can search or watch remote videos
+  if (CONFIG.SEARCH.REMOTE_URI.ANONYMOUS === true) return next()
+
+  // Check our instance follows an actor that shared this video
+  const serverActor = await getServerActor()
+  if (await VideoModel.checkVideoHasInstanceFollow(video.id, serverActor.id) === true) return next()
+
+  return res.status(403)
+            .json({
+              error: 'Cannot get this video regarding follow constraints.'
+            })
+}
+
 const videosCustomGetValidator = (fetchType: VideoFetchType) => {
   return [
     param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
@@ -141,17 +167,20 @@ const videosCustomGetValidator = (fetchType: VideoFetchType) => {
 
       // Video private or blacklisted
       if (video.privacy === VideoPrivacy.PRIVATE || video.VideoBlacklist) {
-        return authenticate(req, res, () => {
-          const user: UserModel = res.locals.oauth.token.User
+        await authenticatePromiseIfNeeded(req, res)
+
+        const user: UserModel = res.locals.oauth ? res.locals.oauth.token.User : null
 
-          // Only the owner or a user that have blacklist rights can see the video
-          if (video.VideoChannel.Account.userId !== user.id && !user.hasRight(UserRight.MANAGE_VIDEO_BLACKLIST)) {
-            return res.status(403)
-                      .json({ error: 'Cannot get this private or blacklisted video.' })
-          }
+        // Only the owner or a user that have blacklist rights can see the video
+        if (
+          !user ||
+          (video.VideoChannel.Account.userId !== user.id && !user.hasRight(UserRight.MANAGE_VIDEO_BLACKLIST))
+        ) {
+          return res.status(403)
+                    .json({ error: 'Cannot get this private or blacklisted video.' })
+        }
 
-          return next()
-        })
+        return next()
       }
 
       // Video is public, anyone can access it
@@ -376,6 +405,7 @@ export {
   videosAddValidator,
   videosUpdateValidator,
   videosGetValidator,
+  checkVideoFollowConstraints,
   videosCustomGetValidator,
   videosRemoveValidator,