index.js

var express   = require('express');
var fs        = require('fs');
var io        = require('socket.io');
var _         = require('underscore');
var Mustache  = require('mustache');
var crypto		= require('crypto');

var app       = express.createServer();
var staticDir = express.static;

io            = io.listen(app);

var opts = {
	port :      1948,
	baseDir :   __dirname + '/../../'
};

io.sockets.on('connection', function(socket) {
	socket.on('slidechanged', function(slideData) {
		console.log(slideData);
		if (createHash(slideData.secret) === slideData.socketId) {
			slideData.secret = null;
			socket.broadcast.emit(slideData.socketId, slideData);
		};
	});
});

app.configure(function() {
	[ 'css', 'js', 'plugin', 'lib' ].forEach(function(dir) {
		app.use('/' + dir, staticDir(opts.baseDir + dir));
	});
});

app.get("/", function(req, res) {
	fs.createReadStream(opts.baseDir + '/index.html').pipe(res);
});

app.get("/token", function(req,res) {
	var ts = new Date().getTime();
	var rand = Math.floor(Math.random()*9999999);
	var secret = ts.toString() + rand.toString();
	res.send({secret: secret, socketId: createHash(secret)});
});

var createHash = function(secret) {
	var cipher = crypto.createCipher('blowfish', secret);
	return(cipher.final('hex'));
};

// Actually listen
app.listen(opts.port || null);

var brown = '\033[33m', 
	green = '\033[32m', 
	reset = '\033[0m';

var slidesLocation = "http://localhost" + ( opts.port ? ( ':' + opts.port ) : '' );

console.log( brown + "reveal.js - Speaker Notes" + reset );
console.log( "1. Open the slides at " + green + slidesLocation + reset );
console.log( "2. Click on the link your JS console to go to the notes page" );
console.log( "3. Advance through your slides and your notes will advance automatically" );