egirlskey/src/api/endpoints/posts/timeline.ts

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'use strict';
/**
* Module dependencies
*/
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import it from '../../it';
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import Post from '../../models/post';
import getFriends from '../../common/get-friends';
import serialize from '../../serializers/post';
/**
* Get timeline of myself
*
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* @param {any} params
* @param {any} user
* @param {any} app
* @return {Promise<any>}
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*/
module.exports = (params, user, app) =>
new Promise(async (res, rej) =>
{
// 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 'since_id' parameter
const [sinceId, sinceIdErr] = it(params.since_id).expect.id().qed();
if (sinceIdErr) return rej('invalid since_id param');
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// Get 'max_id' parameter
const [maxId, maxIdErr] = it(params.max_id).expect.id().qed();
if (maxIdErr) return rej('invalid max_id param');
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// Check if both of since_id and max_id is specified
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if (sinceId && maxId) {
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return rej('cannot set since_id and max_id');
}
// ID list of the user itself and other users who the user follows
const followingIds = await getFriends(user._id);
// Construct query
const sort = {
_id: -1
};
const query = {
user_id: {
$in: followingIds
}
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} as any;
if (sinceId) {
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sort._id = 1;
query._id = {
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$gt: sinceId
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};
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} else if (maxId) {
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query._id = {
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$lt: maxId
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};
}
// Issue query
const timeline = await Post
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.find(query, {
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limit: limit,
sort: sort
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});
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// Serialize
res(await Promise.all(timeline.map(async post =>
await serialize(post, user)
)));
});