webtaks slack bot npm stats

webtask.js

'use latest';

const express = require('express');
const request = require('request');
const moment  = require('moment');
const { fromExpress } = require('webtask-tools');

const app = express();

app.get('/', (req, res)=> {
    const period = `last-month`;
    const { text } = req.query;
    const packageName = text;
    
    if (!packageName) {
        res.status(500).send('You need to tell me which package!')
    }

    request(`https://api.npmjs.org/downloads/range/${period}/${packageName}`,  (error, response, body) => {
        if (error) {
            return res.status(500).send('Ups!.. something was wrong');
        }

        const {error:apiError, downloads, end} = JSON.parse(body);
       
        if (apiError) {
            return res.status(500).send(apiError);
        }
        const stat = stats(downloads, end);
        res.send(`Downloads for <https://www.npmjs.com/${packageName}|${packageName}> *${stat.day}* _last day_ *${stat.week}* _last week_ and *${stat.month}* _last month_`);
    });
    
});

const stats = (downloads, end) => {
    
    const lastDay = moment(end);
    const lastWeek = lastDay.clone().subtract(7, 'days');
    
    const day = downloads.filter((v) => moment(v.day).isSame(lastDay, 'day')).map((v)=> { console.log(v); return v.downloads}).reduce((prev, curr)=> prev+curr, 0);
    const week = downloads.filter((v) => moment(v.day).isAfter(lastWeek)).map((v)=> v.downloads).reduce((prev, curr)=> prev+curr);
    const month = downloads.map((v)=> v.downloads).reduce((prev, curr)=> prev+curr);
    
    return {
        day,
        week,
        month
    };
}

module.exports = fromExpress(app);