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' ].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 );