text: var http        = require('http');
  var express		= require('express');
  var fs			= require('fs');
  var io			= require('socket.io');
  var crypto		= require('crypto');
  
  var app       	= express();
  var staticDir 	= express.static;
  var server    	= http.createServer(app);
  
  io = io(server);
  
  var opts = {
  	port: process.env.PORT || 1948,
  	baseDir : __dirname + '/../../'
  };
  
  io.on( 'connection', function( socket ) {
  	socket.on('multiplex-statechanged', function(data) {
  		if (typeof data.secret == 'undefined' || data.secret == null || data.secret === '') return;
  		if (createHash(data.secret) === data.socketId) {
  			data.secret = null;
  			socket.broadcast.emit(data.socketId, data);
  		};
  	});
  });
  
  [ 'css', 'js', 'plugin', 'lib', 'course' ].forEach(function(dir) {
  	app.use('/' + dir, staticDir(opts.baseDir + dir));
  });
  
  app.get("/", function(req, res) {
  	res.writeHead(200, {'Content-Type': 'text/html'});
  
  	var stream = fs.createReadStream(opts.baseDir + '/index.html');
  	stream.on('error', function( error ) {
  		res.write('<style>body{font-family: sans-serif;}</style><h2>reveal.js multiplex server.</h2><a href="/token">Generate token</a>');
  		res.end();
  	});
  	stream.on('readable', function() {
  		stream.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
  server.listen( opts.port || null );
  
  var brown = '\033[33m',
  	green = '\033[32m',
  	reset = '\033[0m';
  
  console.log( brown + "reveal.js:" + reset + " Multiplex running on port " + green + opts.port + reset );