Introduce processor

src/server/api/endpoints/following/create.ts

@@ -0,0 +1,84 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import User, { pack as packUser } from '../../models/user';
+import Following from '../../models/following';
+import notify from '../../common/notify';
+import event from '../../event';
+
+/**
+ * Follow a user
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	const follower = user;
+
+	// Get 'user_id' parameter
+	const [userId, userIdErr] = $(params.user_id).id().$;
+	if (userIdErr) return rej('invalid user_id param');
+
+	// 自分自身
+	if (user._id.equals(userId)) {
+		return rej('followee is yourself');
+	}
+
+	// Get followee
+	const followee = await User.findOne({
+		_id: userId
+	}, {
+		fields: {
+			data: false,
+			'account.profile': false
+		}
+	});
+
+	if (followee === null) {
+		return rej('user not found');
+	}
+
+	// Check if already following
+	const exist = await Following.findOne({
+		follower_id: follower._id,
+		followee_id: followee._id,
+		deleted_at: { $exists: false }
+	});
+
+	if (exist !== null) {
+		return rej('already following');
+	}
+
+	// Create following
+	await Following.insert({
+		created_at: new Date(),
+		follower_id: follower._id,
+		followee_id: followee._id
+	});
+
+	// Send response
+	res();
+
+	// Increment following count
+	User.update(follower._id, {
+		$inc: {
+			following_count: 1
+		}
+	});
+
+	// Increment followers count
+	User.update({ _id: followee._id }, {
+		$inc: {
+			followers_count: 1
+		}
+	});
+
+	// Publish follow event
+	event(follower._id, 'follow', await packUser(followee, follower));
+	event(followee._id, 'followed', await packUser(follower, followee));
+
+	// Notify
+	notify(followee._id, follower._id, 'follow');
+});