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'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 followers 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;
// 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 = {
followee_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.follower_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 }
});
// 「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,
});
});
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