From 0740711fdeadb4765a2e1f495ed85b4846ef926f Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sun, 23 Jun 2019 12:42:22 +0200
Subject: Began presentation

---
 presentation/plugin/multiplex/index.js | 64 ++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 presentation/plugin/multiplex/index.js

(limited to 'presentation/plugin/multiplex/index.js')

diff --git a/presentation/plugin/multiplex/index.js b/presentation/plugin/multiplex/index.js
new file mode 100644
index 0000000..b4f3c7f
--- /dev/null
+++ b/presentation/plugin/multiplex/index.js
@@ -0,0 +1,64 @@
+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);
\ No newline at end of file
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