4 files changed, 85 insertions, 15 deletions

diff --git a/server/controllers/activitypub/client.ts b/server/controllers/activitypub/client.ts
index e0ab3188b..717473912 100644
--- a/server/controllers/activitypub/client.ts
+++ b/server/controllers/activitypub/client.ts
@@ -114,5 +114,6 @@ async function videoChannelController (req: express.Request, res: express.Respon
 async function videoCommentController (req: express.Request, res: express.Response, next: express.NextFunction) {
   const videoComment: VideoCommentModel = res.locals.videoComment
 
-  return res.json(videoComment.toActivityPubObject())
+  const threadParentComments = await VideoCommentModel.listThreadParentComments(videoComment, undefined)
+  return res.json(videoComment.toActivityPubObject(threadParentComments))
 }
diff --git a/server/lib/activitypub/send/misc.ts b/server/lib/activitypub/send/misc.ts
index 05f327b29..4aa514c15 100644
--- a/server/lib/activitypub/send/misc.ts
+++ b/server/lib/activitypub/send/misc.ts
@@ -5,6 +5,7 @@ import { ACTIVITY_PUB } from '../../../initializers'
 import { ActorModel } from '../../../models/activitypub/actor'
 import { ActorFollowModel } from '../../../models/activitypub/actor-follow'
 import { VideoModel } from '../../../models/video/video'
+import { VideoCommentModel } from '../../../models/video/video-comment'
 import { VideoShareModel } from '../../../models/video/video-share'
 import { activitypubHttpJobScheduler, ActivityPubHttpPayload } from '../../jobs/activitypub-http-job-scheduler'
 
@@ -84,6 +85,34 @@ function getOriginVideoAudience (video: VideoModel, actorsInvolvedInVideo: Actor
   }
 }
 
+function getOriginVideoCommentAudience (
+  videoComment: VideoCommentModel,
+  threadParentComments: VideoCommentModel[],
+  actorsInvolvedInVideo: ActorModel[],
+  isOrigin = false
+) {
+  const to = [ ACTIVITY_PUB.PUBLIC ]
+  const cc = [ ]
+
+  // Owner of the video we comment
+  if (isOrigin === false) {
+    cc.push(videoComment.Video.VideoChannel.Account.Actor.url)
+  }
+
+  // Followers of the poster
+  cc.push(videoComment.Account.Actor.followersUrl)
+
+  // Send to actors we reply to
+  for (const parentComment of threadParentComments) {
+    cc.push(parentComment.Account.Actor.url)
+  }
+
+  return {
+    to,
+    cc: cc.concat(actorsInvolvedInVideo.map(a => a.followersUrl))
+  }
+}
+
 function getObjectFollowersAudience (actorsInvolvedInObject: ActorModel[]) {
   return {
     to: actorsInvolvedInObject.map(a => a.followersUrl),
@@ -92,10 +121,10 @@ function getObjectFollowersAudience (actorsInvolvedInObject: ActorModel[]) {
 }
 
 async function getActorsInvolvedInVideo (video: VideoModel, t: Transaction) {
-  const actorsToForwardView = await VideoShareModel.loadActorsByShare(video.id, t)
-  actorsToForwardView.push(video.VideoChannel.Account.Actor)
+  const actors = await VideoShareModel.loadActorsByShare(video.id, t)
+  actors.push(video.VideoChannel.Account.Actor)
 
-  return actorsToForwardView
+  return actors
 }
 
 async function getAudience (actorSender: ActorModel, t: Transaction, isPublic = true) {
@@ -138,5 +167,6 @@ export {
   getActorsInvolvedInVideo,
   getObjectFollowersAudience,
   forwardActivity,
-  audiencify
+  audiencify,
+  getOriginVideoCommentAudience
 }
diff --git a/server/lib/activitypub/send/send-create.ts b/server/lib/activitypub/send/send-create.ts
index 2f5cdc8c5..e2ee639d9 100644
--- a/server/lib/activitypub/send/send-create.ts
+++ b/server/lib/activitypub/send/send-create.ts
@@ -8,7 +8,8 @@ import { VideoAbuseModel } from '../../../models/video/video-abuse'
 import { VideoCommentModel } from '../../../models/video/video-comment'
 import { getVideoAbuseActivityPubUrl, getVideoDislikeActivityPubUrl, getVideoViewActivityPubUrl } from '../url'
 import {
-  audiencify, broadcastToFollowers, getActorsInvolvedInVideo, getAudience, getObjectFollowersAudience, getOriginVideoAudience,
+  audiencify, broadcastToFollowers, getActorsInvolvedInVideo, getAudience, getObjectFollowersAudience,
+  getOriginVideoAudience, getOriginVideoCommentAudience,
   unicastTo
 } from './misc'
 
@@ -35,11 +36,12 @@ async function sendVideoAbuse (byActor: ActorModel, videoAbuse: VideoAbuseModel,
 
 async function sendCreateVideoCommentToOrigin (comment: VideoCommentModel, t: Transaction) {
   const byActor = comment.Account.Actor
+  const threadParentComments = await VideoCommentModel.listThreadParentComments(comment, t)
+  const commentObject = comment.toActivityPubObject(threadParentComments)
 
   const actorsInvolvedInVideo = await getActorsInvolvedInVideo(comment.Video, t)
-  const audience = getOriginVideoAudience(comment.Video, actorsInvolvedInVideo)
+  const audience = getOriginVideoCommentAudience(comment, threadParentComments, actorsInvolvedInVideo)
 
-  const commentObject = comment.toActivityPubObject()
   const data = await createActivityData(comment.url, byActor, commentObject, t, audience)
 
   return unicastTo(data, byActor, comment.Video.VideoChannel.Account.Actor.sharedInboxUrl, t)
@@ -47,15 +49,15 @@ async function sendCreateVideoCommentToOrigin (comment: VideoCommentModel, t: Tr
 
 async function sendCreateVideoCommentToVideoFollowers (comment: VideoCommentModel, t: Transaction) {
   const byActor = comment.Account.Actor
+  const threadParentComments = await VideoCommentModel.listThreadParentComments(comment, t)
+  const commentObject = comment.toActivityPubObject(threadParentComments)
 
-  const actorsToForwardView = await getActorsInvolvedInVideo(comment.Video, t)
-  const audience = getObjectFollowersAudience(actorsToForwardView)
-
-  const commentObject = comment.toActivityPubObject()
+  const actorsInvolvedInVideo = await getActorsInvolvedInVideo(comment.Video, t)
+  const audience = getOriginVideoCommentAudience(comment, threadParentComments, actorsInvolvedInVideo)
   const data = await createActivityData(comment.url, byActor, commentObject, t, audience)
 
   const followersException = [ byActor ]
-  return broadcastToFollowers(data, byActor, actorsToForwardView, t, followersException)
+  return broadcastToFollowers(data, byActor, actorsInvolvedInVideo, t, followersException)
 }
 
 async function sendCreateViewToOrigin (byActor: ActorModel, video: VideoModel, t: Transaction) {
diff --git a/server/models/video/video-comment.ts b/server/models/video/video-comment.ts
index 66fca2484..dbb2fe429 100644
--- a/server/models/video/video-comment.ts
+++ b/server/models/video/video-comment.ts
@@ -3,6 +3,7 @@ import {
   AfterDestroy, AllowNull, BelongsTo, Column, CreatedAt, DataType, ForeignKey, IFindOptions, Is, Model, Scopes, Table,
   UpdatedAt
 } from 'sequelize-typescript'
+import { ActivityTagObject } from '../../../shared/models/activitypub/objects/common-objects'
 import { VideoCommentObject } from '../../../shared/models/activitypub/objects/video-comment-object'
 import { VideoComment } from '../../../shared/models/videos/video-comment.model'
 import { isActivityPubUrlValid } from '../../helpers/custom-validators/activitypub/misc'
@@ -270,6 +271,30 @@ export class VideoCommentModel extends Model<VideoCommentModel> {
       })
   }
 
+  static listThreadParentComments (comment: VideoCommentModel, t: Sequelize.Transaction) {
+    const query = {
+      order: [ [ 'createdAt', 'ASC' ] ],
+      where: {
+        [ Sequelize.Op.or ]: [
+          { id: comment.getThreadId() },
+          { originCommentId: comment.getThreadId() }
+        ],
+        id: {
+          [ Sequelize.Op.ne ]: comment.id
+        }
+      },
+      transaction: t
+    }
+
+    return VideoCommentModel
+      .scope([ ScopeNames.WITH_ACCOUNT ])
+      .findAll(query)
+  }
+
+  getThreadId (): number {
+    return this.originCommentId || this.id
+  }
+
   isOwned () {
     return this.Account.isOwned()
   }
@@ -289,7 +314,7 @@ export class VideoCommentModel extends Model<VideoCommentModel> {
     } as VideoComment
   }
 
-  toActivityPubObject (): VideoCommentObject {
+  toActivityPubObject (threadParentComments: VideoCommentModel[]): VideoCommentObject {
     let inReplyTo: string
     // New thread, so in AS we reply to the video
     if (this.inReplyToCommentId === null) {
@@ -298,6 +323,17 @@ export class VideoCommentModel extends Model<VideoCommentModel> {
       inReplyTo = this.InReplyToVideoComment.url
     }
 
+    const tag: ActivityTagObject[] = []
+    for (const parentComment of threadParentComments) {
+      const actor = parentComment.Account.Actor
+
+      tag.push({
+        type: 'Mention',
+        href: actor.url,
+        name: `@${actor.preferredUsername}@${actor.getHost()}`
+      })
+    }
+
     return {
       type: 'Note' as 'Note',
       id: this.url,
@@ -306,7 +342,8 @@ export class VideoCommentModel extends Model<VideoCommentModel> {
       updated: this.updatedAt.toISOString(),
       published: this.createdAt.toISOString(),
       url: this.url,
-      attributedTo: this.Account.Actor.url
+      attributedTo: this.Account.Actor.url,
+      tag
     }
   }
 }