server.js

var https = require('https');
var fs = require('fs'); // Using the filesystem module
var url =  require('url');

var options = {
  key: fs.readFileSync('my-key.pem'),
  cert: fs.readFileSync('my-cert.pem')
};

function handleIt(req, res) {
	var parsedUrl = url.parse(req.url);

	var path = parsedUrl.pathname;
	if (path == "/") {
		path = "index.html";
	}

	fs.readFile(__dirname + path,

		// Callback function for reading
		function (err, fileContents) {
			// if there is an error
			if (err) {
				res.writeHead(500);
				return res.end('Error loading ' + req.url);
			}
			// Otherwise, send the data, the contents of the file
			res.writeHead(200);
			res.end(fileContents);
  		}
  	);

	// Send a log message to the console
	console.log("Got a request " + req.url);
}

var httpServer = https.createServer(options, handleIt);
httpServer.listen(8080);


var numUsers = 0;

// WebSocket Portion
// WebSockets work with the HTTP server
var io = require('socket.io').listen(httpServer);

// Register a callback function to run when we have an individual connection
// This is run for each individual user that connects
io.sockets.on('connection',
  // We are given a websocket object in our function
  function(socket) {

    numUsers++;
    console.log("We have a new client: " + socket.id);

    socket.on('dataurl', function(data) {
      io.sockets.emit('dataurl', data);
    });

    socket.on('draw',
      // Run this function when a message is sent
      function(data) {
        console.log(data);

        // Call "broadcast" to send it to all clients (except sender), this is equal to
        // socket.broadcast.emit('message', data);
        //socket.broadcast.send(data);

        // To all clients, on io.sockets instead
        io.sockets.emit('draw', data);
      }
    );

    // When this user emits, client side: socket.emit('otherevent',some data);
    socket.on('otherevent', function(data) {
      // Data comes in as whatever was sent, including objects
      console.log("Received: 'otherevent' " + data);
    });


    socket.on('disconnect', function() {
      console.log("Client has disconnected");
      numUsers--;
    });
  }
);