Initial commit 🍀

src/api/endpoints/users/following.js

@@ -0,0 +1,102 @@
+'use strict';
+
+/**
+ * Module dependencies
+ */
+import * as mongo from 'mongodb';
+import User from '../../models/user';
+import Following from '../../models/following';
+import serialize from '../../serializers/user';
+import getFriends from '../../common/get-friends';
+
+/**
+ * Get following users of a user
+ *
+ * @param {Object} params
+ * @param {Object} me
+ * @return {Promise<object>}
+ */
+module.exports = (params, me) =>
+	new Promise(async (res, rej) =>
+{
+	// Get 'user_id' parameter
+	const userId = params.user_id;
+	if (userId === undefined || userId === null) {
+		return rej('user_id is required');
+	}
+
+	// Get 'iknow' parameter
+	const iknow = params.iknow === 'true';
+
+	// Get 'limit' parameter
+	let limit = params.limit;
+	if (limit !== undefined && limit !== null) {
+		limit = parseInt(limit, 10);
+
+		// From 1 to 100
+		if (!(1 <= limit && limit <= 100)) {
+			return rej('invalid limit range');
+		}
+	} else {
+		limit = 10;
+	}
+
+	// Get 'cursor' parameter
+	const cursor = params.cursor || null;
+
+	// Lookup user
+	const user = await User.findOne({
+		_id: new mongo.ObjectID(userId)
+	});
+
+	if (user === null) {
+		return rej('user not found');
+	}
+
+	// Construct query
+	const query = {
+		follower_id: user._id,
+		deleted_at: { $exists: false }
+	};
+
+	// ログインしていてかつ iknow フラグがあるとき
+	if (me && iknow) {
+		// Get my friends
+		const myFriends = await getFriends(me._id);
+
+		query.followee_id = {
+			$in: myFriends
+		};
+	}
+
+	// カーソルが指定されている場合
+	if (cursor) {
+		query._id = {
+			$lt: new mongo.ObjectID(cursor)
+		};
+	}
+
+	// Get followers
+	const following = await Following
+		.find(query, {}, {
+			limit: limit + 1,
+			sort: { _id: -1 }
+		})
+		.toArray();
+
+	// 「次のページ」があるかどうか
+	const inStock = following.length === limit + 1;
+	if (inStock) {
+		following.pop();
+	}
+
+	// Serialize
+	const users = await Promise.all(following.map(async f =>
+		await serialize(f.followee_id, me, { detail: true })));
+
+	// Response
+	res({
+		users: users,
+		next: inStock ? following[following.length - 1]._id : null,
+	});
+});