WHEP PATCH tweak; media to file recording fix

thirdparty/StreamSaver.js

@@ -98,7 +98,7 @@ function streamSaverFunction(){
       }
 
       channel.port1.onmessage = evt => {
-		console.log(evt);
+		//console.log(evt);
         // Service worker sent us a link that we should open.
         if (evt.data.download) {
           // Special treatment for popup...
@@ -213,7 +213,7 @@ function streamSaverFunction(){
     WritableStream: global.WritableStream || ponyfill.WritableStream,
     supported: true,
     version: { full: '2.0.7', major: 2, minor: 0, dot: 7 },
-    mitm: './thirdparty/mitm.html?v=3'
+    mitm: './thirdparty/mitm.html?v=4'
   }
   
   //console.log(streamSaver);
@@ -232,6 +232,7 @@ function streamSaverFunction(){
     iframe.loaded = false
     iframe.name = 'iframe'
     iframe.isIframe = true
+	iframe.credentialless = true
     iframe.postMessage = (...args) => iframe.contentWindow.postMessage(...args)
     iframe.addEventListener('load', () => {
       iframe.loaded = true

thirdparty/mitm.html

@@ -41,7 +41,7 @@ let scope = ''
 
 function registerWorker() {
   return navigator.serviceWorker.getRegistration('./').then(swReg => {
-    return swReg || navigator.serviceWorker.register('sw.js', { scope: './' })
+    return swReg || navigator.serviceWorker.register('sw.js?v=2', { scope: './' })
   }).then(swReg => {
     const swRegTmp = swReg.installing || swReg.waiting
 
@@ -63,6 +63,11 @@ function registerWorker() {
 function onMessage (event) {
   let { data, ports, origin } = event
 
+  // Ignore messages other than from iframe parent (e.g. extensions)
+  if (event.source !== window.parent) {
+    return
+  }
+  
   // It's important to have a messageChannel, don't want to interfere
   // with other simultaneous downloads
   if (!ports || !ports.length) {