SEChat.js

var cheerio = require('cheerio');
var Promise = require("bluebird");
var request = Promise.promisifyAll(require('request'));
var WebSocket = require('ws');

var email = "SE email",
	password = "SE pw",
	roomid = 17;

var j = request.jar()
request.getAsync({url:"https://stackoverflow.com/users/login", jar:j}).then(function(response){
    var $ = cheerio.load(response[0].body)
    var fkey = $("input[name=fkey]").attr('value')
    return request.postAsync({url:"https://stackoverflow.com/users/login", form: {email:email,password:password,fkey:fkey}, jar:j})
}).then(function(response){
    return request.getAsync({url:"http://chat.stackoverflow.com/rooms/"+roomid, jar:j})
}).then(function(response){
    var $ = cheerio.load(response[0].body)
    var fkey = $("input[name=fkey]").attr('value')
    var url, time;
    request.postAsync({url:"http://chat.stackoverflow.com/ws-auth",form:{fkey:fkey,roomid:roomid}, jar:j}).then(function(response){
        url=JSON.parse(response[0].body).url
        return request.postAsync({url:"http://chat.stackoverflow.com/chats/"+roomid+"/events", form:{fkey:fkey}, jar:j})
    }).then(function(response){
        time=JSON.parse(response[0].body).time
            
        function send(text, prefix){
            request.post({url:"http://chat.stackoverflow.com/chats/"+roomid+"/messages/new",form:{fkey:fkey,text:prefix?prefix+' '+text:text}, jar:j})
        }
            
        console.log(url+"?l="+time)
        var ws = new WebSocket(url+"?l="+time, null, {headers:{ 
            'Origin': 'http://chat.stackoverflow.com'/*,
            'Cookie': j.getCookieString('http://stackoverflow.com')*/
        }});
        var r = 'r'+roomid;
        ws.on('message', function(message) {
            console.log('received:', message);
            var m = JSON.parse(message);
            if (m[r].e){
                m[r].e.forEach(function(ev){
                    if (ev.event_type<=2 && ev.content.indexOf('??')===0){
                        if (ev.content.indexOf('??help')===0)
                            send('[eval bot](https://gist.github.com/cauburtin/42e76693363f543b3f79)', ':'+ev.message_id)
                        else
                            send(eval(ev.content.slice(2)), ':'+ev.message_id)
                    }
                })
            }
        });
        ws.on('open', function() {
            console.log('opened')
        });
        ws.on('error', function(e) {
            console.log(e)
        });
    })

})