Access to the websocket request object

[abachman]

There have been a few issues requesting help with getting the remote IP address of the connected client, but they all assume aedes is not behind a reverse proxy. Specifically, the conn.socket._socket.remoteAddress value on websocket connections for aedes instances behind a reverse proxy always returns the address of the proxy, not the X-Forwarded-For header the proxy adds to all requests.

We're using proxywrap to handle raw TCP requests in proxy-protocol format, but Aedes drops the HTTP request object for websocket requests, so we're not able to access headers and get the X-Forwarded-For value.

I submitted pull request #322 to add the original HTTP request to the Aedes Client object.

No tests, but there's almost no new functionality 🤷‍♂.

The resulting code looks something like this:

const broker = new Aedes(opts);
broker.on('client', (client) => {
  if (client.req) {
    console.log(client.req.headers['x-forwarded-for'])
  }
})

Is there a better way to get this functionality without changing aedes?

related to #222