rudeshark.net/src/api/endpoints/channels/posts.ts

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2017-10-31 16:10:30 +01:00
/**
* Module dependencies
*/
import $ from 'cafy';
import { default as Channel, IChannel } from '../../models/channel';
import { default as Post, IPost } from '../../models/post';
import serialize from '../../serializers/post';
/**
* Show a posts of a channel
*
* @param {any} params
* @param {any} user
* @return {Promise<any>}
*/
module.exports = (params, user) => new Promise(async (res, rej) => {
// Get 'limit' parameter
const [limit = 1000, limitErr] = $(params.limit).optional.number().range(1, 1000).$;
if (limitErr) return rej('invalid limit param');
// Get 'since_id' parameter
const [sinceId, sinceIdErr] = $(params.since_id).optional.id().$;
if (sinceIdErr) return rej('invalid since_id param');
// Get 'max_id' parameter
const [maxId, maxIdErr] = $(params.max_id).optional.id().$;
if (maxIdErr) return rej('invalid max_id param');
// Check if both of since_id and max_id is specified
if (sinceId && maxId) {
return rej('cannot set since_id and max_id');
}
// Get 'channel_id' parameter
const [channelId, channelIdErr] = $(params.channel_id).id().$;
if (channelIdErr) return rej('invalid channel_id param');
// Fetch channel
const channel: IChannel = await Channel.findOne({
_id: channelId
});
if (channel === null) {
return rej('channel not found');
}
//#region Construct query
const sort = {
_id: -1
};
const query = {
channel_id: channel._id
} as any;
if (sinceId) {
sort._id = 1;
query._id = {
$gt: sinceId
};
} else if (maxId) {
query._id = {
$lt: maxId
};
}
//#endregion Construct query
// Issue query
const posts = await Post
.find(query, {
limit: limit,
sort: sort
});
// Serialize
res(await Promise.all(posts.map(async (post) =>
await serialize(post, user)
)));
});