App.js (node.js server) for one-page OAuth flow. See post [here](http://nicholasjacob.com/Javascript/2012/05/27/oauth--websockets-avoiding-the-redirect/)

example.js

// App.js
// the main logic of the application.
// this handles pretty much everything that goes on
// author: nickjacob

// generate faux-guid
function S4() { return (((1+Math.random())*0x10000)|0).toString(16).substring(1); };
function guid() { return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4()); };
// actual app
var Express = require('express')
  , app = Express.createServer(Express.favicon(),Express.static(__dirname))
  , io = require('socket.io').listen(app)
  , OhAuth = require('ohauth');

var cK = 'client_key', cS = 'client_secret';
	ohAuth = new OhAuth(OhAuth.strategies.twitter(cK,cS,'http://my-app.com'),app);
// users for auth
Users = {};

/** express config **/
app.configure(function(){
	app.use(Express.cookieParser());
	app.use(Express.bodyParser());
	app.use(app.router);	
});
// basic express configuration
app.listen(8080);	
app.get('/', function (req, res) {
	res.sendfile(__dirname + '/index.html');
});
// lets a socket associate itself with a session
app.get('/register',function(req,res){
	req.session.guid = guid();
	Users[req.session.guid] = {};
	Users[req.session.guid].credentials = req.session.credentials;
	res.send(req.session.guid);
});
// this finishes the oauth; done in a separate window.
app.get('/oauth/success',function(req,res){
	Users[req.session.guid].credentials = req.session.credentials;
	Users[req.session.guid].socket.emit('auth_complete',req.session.credentials);
	// the above settings block, now we can claim some success for the user
	res.sendfile(__dirname+'/success.html');
});


// socket.io -- connection passes new socket, we bind eventlisteners
io.sockets.on('connection',function(socket){	
	// this is the second leg of the registration process 
	socket.on('finish_register',function(guid){
		Users[guid].socket = socket;
		socket.guid = guid; // both ways
	});
});

from post: OAuth & One-Page Apps: Avoiding the Redirect