exploit: support saving of exploit page to disk

exploit/stage1.html

@@ -20,7 +20,9 @@
   </section>
 
   <script>
-    window.ORIGIN_URL = window.location.protocol === 'data:' ? '__START_ORIGIN__' : window.location.href;
+    window.ORIGIN_URL =
+      window.location.protocol === 'data:' ? '__START_ORIGIN__' :
+        window.location.protocol === 'file:' ? 'https://rootmy.tv' : window.location.href;
 
     window.onerror = function (err) {
       console.error(err);
@@ -171,9 +173,11 @@
         log("An unexpected error occured: " + err.toString());
       }
     }
-
     document.querySelector('#exploit').addEventListener('click', function () {
-      bootstrap('localhost', new URL('stage2.html', ORIGIN_URL).href);
+      // Allow people to download the exploit page to manually set target IP,
+      // in case direct on-tv deployment fails for some reason.
+      var target = window.location.protocol === 'file:' ? prompt('Enter IP address of Your TV') : 'localhost';
+      bootstrap(target, new URL('stage2.html', ORIGIN_URL).href);
     });
   </script>
 </body>