84 lines
1.5 KiB
JavaScript
84 lines
1.5 KiB
JavaScript
'use strict';
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/**
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* Module dependencies
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*/
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import * as mongo from 'mongodb';
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import Post from '../../models/post';
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import serialize from '../../serializers/post';
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/**
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* Show a context of a post
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*
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* @param {Object} params
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* @param {Object} user
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* @return {Promise<object>}
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*/
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module.exports = (params, user) =>
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new Promise(async (res, rej) =>
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{
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// Get 'post_id' parameter
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const postId = params.post_id;
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if (postId === undefined || postId === null) {
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return rej('post_id is required');
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}
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// Get 'limit' parameter
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let limit = params.limit;
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if (limit !== undefined && limit !== null) {
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limit = parseInt(limit, 10);
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// From 1 to 100
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if (!(1 <= limit && limit <= 100)) {
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return rej('invalid limit range');
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}
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} else {
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limit = 10;
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}
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// Get 'offset' parameter
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let offset = params.offset;
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if (offset !== undefined && offset !== null) {
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offset = parseInt(offset, 10);
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} else {
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offset = 0;
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}
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// Lookup post
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const post = await Post.findOne({
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_id: new mongo.ObjectID(postId)
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});
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if (post === null) {
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return rej('post not found', 'POST_NOT_FOUND');
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}
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const context = [];
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let i = 0;
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async function get(id) {
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i++;
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const p = await Post.findOne({ _id: id });
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if (i > offset) {
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context.push(p);
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}
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if (context.length == limit) {
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return;
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}
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if (p.reply_to_id) {
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await get(p.reply_to_id);
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}
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}
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if (post.reply_to_id) {
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await get(post.reply_to_id);
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}
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// Serialize
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res(await Promise.all(context.map(async post =>
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await serialize(post, user))));
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});
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