Implement like

src/services/post/reaction/create.ts

@@ -0,0 +1,94 @@
+import { IUser, pack as packUser, isLocalUser, isRemoteUser } from '../../../models/user';
+import Post, { IPost, pack as packPost } from '../../../models/post';
+import PostReaction from '../../../models/post-reaction';
+import { publishPostStream } from '../../../publishers/stream';
+import notify from '../../../publishers/notify';
+import pushSw from '../../../publishers/push-sw';
+import PostWatching from '../../../models/post-watching';
+import watch from '../watch';
+import renderLike from '../../../remote/activitypub/renderer/like';
+import { deliver } from '../../../queue';
+import context from '../../../remote/activitypub/renderer/context';
+
+export default async (user: IUser, post: IPost, reaction: string) => new Promise(async (res, rej) => {
+	// Myself
+	if (post.userId.equals(user._id)) {
+		return rej('cannot react to my post');
+	}
+
+	// if already reacted
+	const exist = await PostReaction.findOne({
+		postId: post._id,
+		userId: user._id
+	});
+
+	if (exist !== null) {
+		return rej('already reacted');
+	}
+
+	// Create reaction
+	await PostReaction.insert({
+		createdAt: new Date(),
+		postId: post._id,
+		userId: user._id,
+		reaction
+	});
+
+	res();
+
+	const inc = {};
+	inc[`reactionCounts.${reaction}`] = 1;
+
+	// Increment reactions count
+	await Post.update({ _id: post._id }, {
+		$inc: inc
+	});
+
+	publishPostStream(post._id, 'reacted');
+
+	// Notify
+	notify(post.userId, user._id, 'reaction', {
+		postId: post._id,
+		reaction: reaction
+	});
+
+	pushSw(post.userId, 'reaction', {
+		user: await packUser(user, post.userId),
+		post: await packPost(post, post.userId),
+		reaction: reaction
+	});
+
+	// Fetch watchers
+	PostWatching
+		.find({
+			postId: post._id,
+			userId: { $ne: user._id }
+		}, {
+			fields: {
+				userId: true
+			}
+		})
+		.then(watchers => {
+			watchers.forEach(watcher => {
+				notify(watcher.userId, user._id, 'reaction', {
+					postId: post._id,
+					reaction: reaction
+				});
+			});
+		});
+
+	// ユーザーがローカルユーザーかつ自動ウォッチ設定がオンならばこの投稿をWatchする
+	if (isLocalUser(user) && user.account.settings.autoWatch !== false) {
+		watch(user._id, post);
+	}
+
+	//#region 配信
+	const content = renderLike(user, post);
+	content['@context'] = context;
+
+	// リアクターがローカルユーザーかつリアクション対象がリモートユーザーの投稿なら配送
+	if (isLocalUser(user) && isRemoteUser(post._user)) {
+		deliver(user, content, post._user.account.inbox).save();
+	}
+	//#endregion
+});