server.js

import express from 'express'
import path from 'path'
import { createServer } from 'http'
import { Server } from 'socket.io'
import { toBuffer } from 'qrcode'
import fetch from 'node-fetch'
import Helper from './lib/helper.js'

function connect(conn, PORT) {
    let app = global.app = express()
    let server = global.server = createServer(app)
    let _qr = 'invalid'
    
    conn.ev.on('connection.update', function appQR({ qr }) {
        if (qr) _qr = qr
    })
    
    app.use(async (req, res) => {
        res.setHeader('content-type', 'image/png')
        res.end(await toBuffer(_qr))
    })
    app.use(express.static(path.join(Helper.__dirname(import.meta.url), 'views')))
    
    let io = new Server(server)
    io.on('connection', socket => {
        let { unpipeEmit } = pipeEmit(conn, socket, 'conn-')
        socket.once('disconnect', unpipeEmit)
    })

    server.listen(PORT, () => {
        console.log('App listened on port', PORT)
        if (opts['keepalive']) keepAlive()
    })
}

function pipeEmit(event, event2, prefix = '') {
    let old = event.emit
    event.emit = function (event, ...args) {
        old.emit(event, ...args)
        event2.emit(prefix + event, ...args)
    }
    return {
        unpipeEmit() {
            event.emit = old
        }
    }
}

function keepAlive() {
    const url = `https://${process.env.REPL_SLUG}.${process.env.REPL_OWNER}.repl.co`
    if (/(\/\/|\.)undefined\./.test(url)) return
    setInterval(() => {
        fetch(url).catch(console.error)
    }, 5 * 1000 * 60)
}


export default connect