server.js

const express = require('express');
const app = express();
const server = require('http').Server(app);
const io = require('socket.io')(server);
const { v4: uuidV4 } = require('uuid');

app.set('view engine', 'ejs');
app.use(express.static('public'));

app.get('/', (req, res) => {
  res.redirect(`/${uuidV4()}`);
});

app.get('/:room', (req, res) => {
  res.render('room', {
       roomId: req.params.room,
       peerPort: process.env.PEER_PORT || 3001 ,
       peerHost: process.env.PEER_HOST || 'localhost' 
    });
});

io.on('connection', socket => {
  socket.on('join-room', (roomId, userId) => {
    socket.join(roomId);
    socket.to(roomId).broadcast.emit('user-connected', userId);

    socket.on('disconnect', () => {
      socket.to(roomId).broadcast.emit('user-disconnected', userId);
    })
  })
});

app.set('port', process.env.PORT || 3000);

server.listen(app.get('port'));