Sharkey/src/api/endpoints/users/followers.ts

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