From 2ccaeeb341ffe8c2609039bf4c6d8835b4650316 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Wed, 10 Jan 2018 17:18:12 +0100
Subject: Fetch remote AP objects

---
 server/lib/activitypub/video-comments.ts | 156 +++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 server/lib/activitypub/video-comments.ts

(limited to 'server/lib/activitypub/video-comments.ts')

diff --git a/server/lib/activitypub/video-comments.ts b/server/lib/activitypub/video-comments.ts
new file mode 100644
index 000000000..17c86a381
--- /dev/null
+++ b/server/lib/activitypub/video-comments.ts
@@ -0,0 +1,156 @@
+import { VideoCommentObject } from '../../../shared/models/activitypub/objects/video-comment-object'
+import { isVideoCommentObjectValid } from '../../helpers/custom-validators/activitypub/video-comments'
+import { logger } from '../../helpers/logger'
+import { doRequest } from '../../helpers/requests'
+import { ACTIVITY_PUB } from '../../initializers'
+import { ActorModel } from '../../models/activitypub/actor'
+import { VideoModel } from '../../models/video/video'
+import { VideoCommentModel } from '../../models/video/video-comment'
+import { getOrCreateActorAndServerAndModel } from './actor'
+import { getOrCreateAccountAndVideoAndChannel } from './videos'
+
+async function videoCommentActivityObjectToDBAttributes (video: VideoModel, actor: ActorModel, comment: VideoCommentObject) {
+  let originCommentId: number = null
+  let inReplyToCommentId: number = null
+
+  // If this is not a reply to the video (thread), create or get the parent comment
+  if (video.url !== comment.inReplyTo) {
+    const [ parent ] = await addVideoComment(video, comment.inReplyTo)
+    if (!parent) {
+      logger.warn('Cannot fetch or get parent comment %s of comment %s.', comment.inReplyTo, comment.id)
+      return undefined
+    }
+
+    originCommentId = parent.originCommentId || parent.id
+    inReplyToCommentId = parent.id
+  }
+
+  return {
+    url: comment.url,
+    text: comment.content,
+    videoId: video.id,
+    accountId: actor.Account.id,
+    inReplyToCommentId,
+    originCommentId,
+    createdAt: new Date(comment.published),
+    updatedAt: new Date(comment.updated)
+  }
+}
+
+async function addVideoComments (instance: VideoModel, commentUrls: string[]) {
+  for (const commentUrl of commentUrls) {
+    await addVideoComment(instance, commentUrl)
+  }
+}
+
+async function addVideoComment (videoInstance: VideoModel, commentUrl: string) {
+  logger.info('Fetching remote video comment %s.', commentUrl)
+
+  const { body } = await doRequest({
+    uri: commentUrl,
+    json: true,
+    activityPub: true
+  })
+
+  if (isVideoCommentObjectValid(body) === false) {
+    logger.debug('Remote video comment JSON is not valid.', { body })
+    return undefined
+  }
+
+  const actorUrl = body.attributedTo
+  if (!actorUrl) return []
+
+  const actor = await getOrCreateActorAndServerAndModel(actorUrl)
+  const entry = await videoCommentActivityObjectToDBAttributes(videoInstance, actor, body)
+  if (!entry) return []
+
+  return VideoCommentModel.findOrCreate({
+    where: {
+      url: body.id
+    },
+    defaults: entry
+  })
+}
+
+async function resolveThread (url: string, comments: VideoCommentModel[] = []) {
+   // Already have this comment?
+  const commentFromDatabase = await VideoCommentModel.loadByUrlAndPopulateReplyAndVideo(url)
+  if (commentFromDatabase) {
+    let parentComments = comments.concat([ commentFromDatabase ])
+
+    // Speed up things and resolve directly the thread
+    if (commentFromDatabase.InReplyToVideoComment) {
+      const data = await VideoCommentModel.listThreadParentComments(commentFromDatabase, undefined, 'DESC')
+      console.log(data)
+
+      parentComments = parentComments.concat(data)
+    }
+
+    return resolveThread(commentFromDatabase.Video.url, parentComments)
+  }
+
+  try {
+    // Maybe it's a reply to a video?
+    const { video } = await getOrCreateAccountAndVideoAndChannel(url)
+
+    if (comments.length !== 0) {
+      const firstReply = comments[ comments.length - 1 ]
+      firstReply.inReplyToCommentId = null
+      firstReply.originCommentId = null
+      firstReply.videoId = video.id
+      comments[comments.length - 1] = await firstReply.save()
+
+      for (let i = comments.length - 2; i >= 0; i--) {
+        const comment = comments[ i ]
+        comment.originCommentId = firstReply.id
+        comment.inReplyToCommentId = comments[ i + 1 ].id
+        comment.videoId = video.id
+
+        comments[i] = await comment.save()
+      }
+    }
+
+    return { video, parents: comments }
+  } catch (err) {
+    logger.debug('Cannot get or create account and video and channel for reply %s, fetch comment', url, err)
+
+    if (comments.length > ACTIVITY_PUB.MAX_RECURSION_COMMENTS) {
+      throw new Error('Recursion limit reached when resolving a thread')
+    }
+
+    const { body } = await doRequest({
+      uri: url,
+      json: true,
+      activityPub: true
+    })
+
+    if (isVideoCommentObjectValid(body) === false) {
+      throw new Error('Remote video comment JSON is not valid :' + JSON.stringify(body))
+    }
+
+    const actorUrl = body.attributedTo
+    if (!actorUrl) throw new Error('Miss attributed to in comment')
+
+    const actor = await getOrCreateActorAndServerAndModel(actorUrl)
+    const comment = new VideoCommentModel({
+      url: body.url,
+      text: body.content,
+      videoId: null,
+      accountId: actor.Account.id,
+      inReplyToCommentId: null,
+      originCommentId: null,
+      createdAt: new Date(body.published),
+      updatedAt: new Date(body.updated)
+    })
+
+    return resolveThread(body.inReplyTo, comments.concat([ comment ]))
+  }
+
+}
+
+export {
+  videoCommentActivityObjectToDBAttributes,
+  addVideoComments,
+  addVideoComment,
+  resolveThread
+}
-- 
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