wip

src/api/endpoints/users/followers.ts

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+'use strict';
+
+/**
+ * Module dependencies
+ */
+import it from '../../it';
+import User from '../../models/user';
+import Following from '../../models/following';
+import serialize from '../../serializers/user';
+import getFriends from '../../common/get-friends';
+
+/**
+ * Get followers of a user
+ *
+ * @param {any} params
+ * @param {any} me
+ * @return {Promise<any>}
+ */
+module.exports = (params, me) =>
+	new Promise(async (res, rej) =>
+{
+	// Get 'user_id' parameter
+	const [userId, userIdErr] = it(params.user_id, 'id', true);
+	if (userIdErr) return rej('invalid user_id param');
+
+	// Get 'iknow' parameter
+	const [iknow, iknowErr] = it(params.iknow).expect.boolean().default(false).qed();
+	if (iknowErr) return rej('invalid iknow param');
+
+	// Get 'limit' parameter
+	const [limit, limitErr] = it(params.limit).expect.number().range(1, 100).default(10).qed();
+	if (limitErr) return rej('invalid limit param');
+
+	// Get 'cursor' parameter
+	const [cursor, cursorErr] = it(params.cursor).expect.id().default(null).qed();
+	if (cursorErr) return rej('invalid cursor param');
+
+	// Lookup user
+	const user = await User.findOne({
+		_id: userId
+	}, {
+		fields: {
+			_id: true
+		}
+	});
+
+	if (user === null) {
+		return rej('user not found');
+	}
+
+	// Construct query
+	const query = {
+		followee_id: user._id,
+		deleted_at: { $exists: false }
+	} as any;
+
+	// 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.follower_id = {
+			$in: myFriends
+		};
+	}
+
+	// カーソルが指定されている場合
+	if (cursor) {
+		query._id = {
+			$lt: cursor
+		};
+	}
+
+	// Get followers
+	const following = await Following
+		.find(query, {
+			limit: limit + 1,
+			sort: { _id: -1 }
+		});
+
+	// 「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.follower_id, me, { detail: true })));
+
+	// Response
+	res({
+		users: users,
+		next: inStock ? following[following.length - 1]._id : null,
+	});
+});