var express = require('express')
  , MongoStore = require('connect-mongo')(express)
  , ioSession = require('socket.io-session');

var app = express();

var sessionKey = 'secret key'
var memoryStore = new MongoStore({ db: 'name', url: MONGO_URI + '/name' });
app.use(express.cookieParser());
app.use(express.session({ secret: sessionKey, store: memoryStore }));

var io = require('socket.io').listen(server);
io.set('authorization', ioSession(express.cookieParser(sessionKey), memoryStore));

io.on('connection', function (socket) {
  console.log(socket.handshake.session);
})

ioSession(cookieParser, memoryStore, [session sid key], [authorization(data, accept)])