Deliver posts to remote followers

src/processor/http/deliver-post.ts

@@ -0,0 +1,94 @@
+import Channel from '../../models/channel';
+import Following from '../../models/following';
+import ChannelWatching from '../../models/channel-watching';
+import Post, { pack } from '../../models/post';
+import User, { isLocalUser } from '../../models/user';
+import stream, { publishChannelStream } from '../../publishers/stream';
+import context from '../../remote/activitypub/renderer/context';
+import renderNote from '../../remote/activitypub/renderer/note';
+import request from '../../remote/request';
+
+export default ({ data }) => Post.findOne({ _id: data.id }).then(post => {
+	const promisedPostObj = pack(post);
+	const promises = [];
+
+	// タイムラインへの投稿
+	if (!post.channelId) {
+		promises.push(
+			// Publish event to myself's stream
+			promisedPostObj.then(postObj => {
+				stream(post.userId, 'post', postObj);
+			}),
+
+			Promise.all([
+				User.findOne({ _id: post.userId }),
+
+				// Fetch all followers
+				Following.aggregate([
+					{
+						$lookup: {
+							from: 'users',
+							localField: 'followerId',
+							foreignField: '_id',
+							as: 'follower'
+						}
+					},
+					{
+					$match: {
+							followeeId: post.userId
+						}
+					}
+				], {
+					_id: false
+				})
+			]).then(([user, followers]) => Promise.all(followers.map(following => {
+				if (isLocalUser(following.follower)) {
+					// Publish event to followers stream
+					return promisedPostObj.then(postObj => {
+						stream(following.followerId, 'post', postObj);
+					});
+				}
+
+				return renderNote(user, post).then(rendered => {
+					rendered['@context'] = context;
+					return request(user, following.follower[0].account.inbox, rendered);
+				});
+			})))
+		);
+	}
+
+	// チャンネルへの投稿
+	if (post.channelId) {
+		promises.push(
+			// Increment channel index(posts count)
+			Channel.update({ _id: post.channelId }, {
+				$inc: {
+					index: 1
+				}
+			}),
+
+			// Publish event to channel
+			promisedPostObj.then(postObj => {
+				publishChannelStream(post.channelId, 'post', postObj);
+			}),
+
+			Promise.all([
+				promisedPostObj,
+
+				// Get channel watchers
+				ChannelWatching.find({
+					channelId: post.channelId,
+					// 削除されたドキュメントは除く
+					deletedAt: { $exists: false }
+				})
+			]).then(([postObj, watches]) => {
+				// チャンネルの視聴者(のタイムライン)に配信
+				watches.forEach(w => {
+					stream(w.userId, 'post', postObj);
+				});
+			})
+		);
+	}
+
+	return Promise.all(promises);
+});