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

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/**
* Module dependencies
*/
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import it from 'cafy';
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import Post from '../../models/post';
import serialize from '../../serializers/post';
/**
* Show a context of a post
*
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* @param {any} params
* @param {any} user
* @return {Promise<any>}
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*/
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module.exports = (params, user) => new Promise(async (res, rej) => {
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// Get 'post_id' parameter
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const [postId, postIdErr] = it(params.post_id, 'id', true);
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if (postIdErr) return rej('invalid post_id param');
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// Get 'limit' parameter
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const [limit = 10, limitErr] = it(params.limit).expect.number().range(1, 100).get();
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if (limitErr) return rej('invalid limit param');
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// Get 'offset' parameter
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const [offset = 0, offsetErr] = it(params.offset).expect.number().min(0).get();
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if (offsetErr) return rej('invalid offset param');
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// Lookup post
const post = await Post.findOne({
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_id: postId
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});
if (post === null) {
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return rej('post not found');
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}
const context = [];
let i = 0;
async function get(id) {
i++;
const p = await Post.findOne({ _id: id });
if (i > offset) {
context.push(p);
}
if (context.length == limit) {
return;
}
if (p.reply_to_id) {
await get(p.reply_to_id);
}
}
if (post.reply_to_id) {
await get(post.reply_to_id);
}
// Serialize
res(await Promise.all(context.map(async post =>
await serialize(post, user))));
});