server.js

const express =require('express')
const passport=require('passport')
const cors = require('cors')
const app= express()
const server= require('http').Server(app)
const bodyParser = require('body-parser')
const cookieSession = require('cookie-session')
require('./passport-setup')
const io=require('socket.io')(server)
const { v4: uuidV4 } = require('uuid') //to generate dynamic url
var nodemailer = require('nodemailer');
const { content } = require('googleapis/build/src/apis/content')
const { profile } = require('console')
require('dotenv').config();
var transporter = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: process.env.EMAIL,
    pass: process.env.PASSWORD
  }
});

app.set('view engine', 'ejs') // to render our front end pages,Files from views directory will be rendered
app.use(express.static('public')) //we will keep all static front-end files like javascript and css here in this folder. this function makes them accessible
app.use(cors())
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())
app.use(cookieSession({
    name: 'gmeet',
    keys: ['key1', 'key2']
  }))

  const isLoggedIn = (req, res, next) => {
    if (req.user) {
        next();
    } else {
        res.sendStatus(401);
    }
}
app.use(passport.initialize());
app.use(passport.session());
username = "";
app.get('/',(req,res)=>{
    res.render('home')
})




app.get('/meeting',(req,res)=>{
    res.redirect(`/${uuidV4()}`)
})  //This tells server that on getting request through path '/' do the function written inside

app.get('/failed', (req,res)=>{
    res.send('Login Failed')
})

app.get('/good',isLoggedIn, (req,res)=>{
    res.redirect('/meeting')
})

app.get('/logout',(req,res)=>{
  req.session=null;
  req.logout();
  res.render('logout')
})


app.get('/google',
  passport.authenticate('google', { scope: ['profile','email'] }));

app.get('/google/callback', 
  passport.authenticate('google', { failureRedirect: '/failed' }),
  function(req, res) {
    
    res.redirect('/good');
  });

app.get('/:room',(req,res)=>{
    username = req.user.name.givenName;
    console.log(req.user)
    res.render('room',{roomId: req.params.room})
})
io.on('connection', socket=>{
    socket.on('join-room',(roomId,userId)=>{
        socket.join(roomId)
        socket.to(roomId).emit('user-connected',userId)

        socket.on('message', (message) => {
         const formattedMessage = username + ' : ' +message;
         console.log(username);
          io.to(roomId).emit('createMessage', formattedMessage);
        });
      socket.on('newStroke', (coordinates) => {
        socket.to(roomId).emit('newStroke', coordinates)
      });


      socket.on('stroke', coordinates => {
          io.to(roomId).emit('draw', coordinates)
      }); 
      
      socket.on('mail',content=>{
        sendnow(content);
      })


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

    })
})
server.listen('3000')




function sendnow(content)
{
  var mailOptions = {
    from: 'aman.music420@gmail.com',
    to: content.address,
    subject: 'Meeting Invitiation',
    text: content.txt
  };
  
  transporter.sendMail(mailOptions, function(error, info){
    if (error) {
      console.log(error);
    } else {
      console.log('Email sent: ' + info.response);
    }
  });
}