Add local domain - fixes #2

Author: benfrancis

package-lock.json

@@ -20,6 +20,7 @@
   },
   "dependencies": {
     "dbus": "^1.0.7",
+    "dnssd": "^0.4.1",
     "dompurify": "^2.0.12",
     "express": "^4.17.1",
     "jsonwebtoken": "^8.5.1",

package.json

@@ -0,0 +1,33 @@
+'use strict';
+
+const dnssd = require('dnssd');
+
+/**
+ * The broadcast service advertises a .local domain for the kiosk's web server
+ * using DNS-SD, which resolves to its local IP address using mDNS.
+ */
+class Broadcast {
+
+  /**
+   * Start the broadcast service.
+   * 
+   * @param {number} port Port number of HTTP server to broadcast.
+   */
+   start(port) {
+    const broadcast = new dnssd.Advertisement(
+      dnssd.tcp('http'),
+      port,
+      {
+        'name': 'Krellian Kiosk',
+        'host': 'kiosk'
+      }
+    );
+    broadcast.on('error', (e) => {
+      console.error('Error broadcasting local domain ' + e);
+    });
+    broadcast.start();
+    console.log('Broadcasting local domain kiosk.local...');
+  }
+}
+
+module.exports = new Broadcast();

services/broadcast.js

@@ -1,6 +1,7 @@
 const express = require('express');
 const router = require('./router');
 const database = require('./database');
+const broadcast = require('./broadcast');
 const credentials = require('./models/credentials');
 const network = require('./models/network');
 const userAgent = require('./models/user-agent');
@@ -43,6 +44,10 @@ var Services = {
 
     // Start user agent
     userAgent.start();
+
+    // Start DNS-SD broadcast
+    broadcast.start(port);
+
   },
 
   setChrome: function(chrome) {