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