app.js

// Including libraries

var app = require('http').createServer(handler),
	io = require('socket.io').listen(app),
	static = require('node-static'); // for serving files

// This will make all the files in the current folder
// accessible from the web
var fileServer = new static.Server('./');
	
// This is the port for our web server.
var port = process.env.PORT || 8080;
app.listen(port, function(){
  console.log("Listening on port "+port);
});

// If the URL of the socket server is opened in a browser
function handler (request, response) {

	request.addListener('end', function () {
        fileServer.serve(request, response);
    });
}

// config required for heroku
io.configure(function () { 
  io.set("transports", ["xhr-polling"]); 
  io.set("polling duration", 10); 
});

// Listen for incoming connections from clients
io.sockets.on('connection', function (socket) {

	// Start listening for mouse move events
	socket.on('mousemove', function (data) {
		
		// This line sends the event (broadcasts it)
		// to everyone except the originating client.
		socket.broadcast.emit('moving', data);
	});

  socket.on('textEntry', function(data){
    socket.broadcast.emit('writeText', data);
  });
});