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

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'use strict';
/**
* Module dependencies
*/
import * as mongo from 'mongodb';
import Post from '../../models/post';
import getFriends from '../../common/get-friends';
import serialize from '../../serializers/post';
/**
* Get timeline of myself
*
* @param {Object} params
* @param {Object} user
* @param {Object} app
* @return {Promise<object>}
*/
module.exports = (params, user, app) =>
new Promise(async (res, rej) =>
{
// 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;
}
const since = params.since_id || null;
const max = params.max_id || null;
// Check if both of since_id and max_id is specified
if (since !== null && max !== null) {
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
}
};
if (since !== null) {
sort._id = 1;
query._id = {
$gt: new mongo.ObjectID(since)
};
} else if (max !== null) {
query._id = {
$lt: new mongo.ObjectID(max)
};
}
// 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)
)));
});