From d1419f9430dcfc0876a55319d093fb07b2537b59 Mon Sep 17 00:00:00 2001
From: mattmcclaskey <matt@kasmweb.com>
Date: Mon, 20 Mar 2023 15:25:32 -0400
Subject: [PATCH] KASM-4146 check browser support for webrtc

---
 app/ui.js   | 5 +++++
 core/rfb.js | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/app/ui.js b/app/ui.js
index 4c4e3ef1..c51a0e66 100644
--- a/app/ui.js
+++ b/app/ui.js
@@ -2175,6 +2175,11 @@ const UI = {
 
     toggleWebRTC() {
         if (UI.rfb) {
+            if (typeof RTCPeerConnection === 'undefined') {
+                UI.showStatus('This browser does not support WebRTC UDP Data Channels.', 'warn', 5000, true);
+                return;
+            }
+
             if (UI.getSetting('enable_webrtc')) {
                 UI.rfb.enableWebRTC = true;
             } else {
diff --git a/core/rfb.js b/core/rfb.js
index 58557019..4f17fcef 100644
--- a/core/rfb.js
+++ b/core/rfb.js
@@ -1074,7 +1074,7 @@ export default class RFB extends EventTargetMixin {
         this._resendClipboardNextUserDrivenEvent = true;
 
         // WebRTC UDP datachannel inits
-        {
+        if (typeof RTCPeerConnection !== 'undefined') {
             this._udpBuffer = new Map();
 
             this._udpPeer = new RTCPeerConnection({
@@ -1179,7 +1179,7 @@ export default class RFB extends EventTargetMixin {
             }
         }
 
-	    if (this._useUdp) {
+	    if (this._useUdp && typeof RTCPeerConnection !== 'undefined') {
             setTimeout(function() { this._sendUdpUpgrade() }.bind(this), 3000);
         }