app.js

var auth_middleware = function() {
  return function(req, res, next) {
    var urlp= url.parse(req.url, true)
    if( urlp.query.login_with ) {
      req.authenticate([urlp.query.login_with], function(error, authenticated) {
        if( error ) {
          // Something has gone awry, behave as you wish.
          console.log( error );
          res.end();
        } else {
          if( authenticated === undefined ) {
            // The authentication strategy requires some more browser interaction, suggest you do nothing here!
          } else {
            // We've either failed to authenticate, or succeeded (req.isAuthenticated() will confirm, as will the value of the received argument)
            next();
          }
        }
      });
    } else {
      next();
    }
  }
};


var app = express.createServer(
  express.bodyParser(),
  express.static(__dirname + "/public"),
  express.cookieParser(),
  auth_middleware(),
  express.session({ secret: 'htuayreve', isAuth: false, store: new express.session.MemoryStore({ reapInterval: -1 }) })
);

app.configure(function(){
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use( 
    auth({strategies: [ 
            auth.Twitter({consumerKey: conf.twit.consumerKey, consumerSecret: conf.twit.consumerSecret}) ],
          logoutHandler: require('./lib/ca-events').redirectOnLogout("/")
    }));
});