How to share sessions with Socket.IO 1.x and Express 4.x?

Question

How can I share a session with Socket.io 1.0 and Express 4.x? I use a Redis Store, but I believe it should not matter. I know I have to use a middleware to look at cookies a

Answer 1

Now, the original accepted answer doesn't work for me either. Same as @Rahil051, I used express-socket.io-session module, and it still works. This module uses cookie-parser, to parse session id before entering express-session middleware. I think it's silmiar to @pootzko, @Mustafa and @Kosar's answer.

I'm using these modules:

"dependencies": 
{
  "debug": "^2.6.1",
  "express": "^4.14.1",
  "express-session": "^1.15.1",
  "express-socket.io-session": "^1.3.2
  "socket.io": "^1.7.3"
}

check out the data in socket.handshake:

const debug = require('debug')('ws');
const sharedsession = require('express-socket.io-session');

module.exports = (server, session) => {
    const io = require('socket.io').listen(server);
    let connections = [];

    io.use(sharedsession(session, {
        autoSave: true,
    }));

    io.use(function (socket, next) {
        debug('check handshake %s', JSON.stringify(socket.handshake, null, 2));
        debug('check headers %s', JSON.stringify(socket.request.headers));
        debug('check socket.id %s', JSON.stringify(socket.id));
        next();
    });

    io.sockets.on('connection', (socket) => {
        connections.push(socket);
    });
};