tor-browser

commit d2c66790e1eb1254120756f33b7e0af3ed0769a8
parent c14352afe04ae145b13cf0d752beaed5db22f6a2
Author: Jan-Ivar Bruaroey <jib@mozilla.com>
Date:   Fri, 31 Oct 2025 15:54:28 +0000

Bug 1913599 - Interventions for some websites relying on createEncodedStreams(). r=twisniewski,webcompat-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D268638

Diffstat:
M
browser/extensions/webcompat/data/interventions.json
 | 
116
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
browser/extensions/webcompat/injections/js/bug1913599-shim-createencodedstreams.js
 | 
92
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 208 insertions(+), 0 deletions(-)
diff --git a/browser/extensions/webcompat/data/interventions.json b/browser/extensions/webcompat/data/interventions.json
@@ -5273,6 +5273,122 @@
       }
     ]
   },
+  "1913599": {
+    "label": "createEncodedStreams shim test-page",
+    "bugs": {
+      "1913599": {
+        "issue": "broken-meetings",
+        "matches": ["https://jan-ivar.github.io/*"]
+      }
+    },
+    "interventions": [
+      {
+        "platforms": ["all"],
+        "only_channels": ["nightly"],
+        "content_scripts": {
+          "all_frames": true,
+          "js": ["bug1913599-shim-createencodedstreams.js"]
+        }
+      }
+    ]
+  },
+  "1896361": {
+    "label": "Meta Messenger",
+    "bugs": {
+      "1896361": {
+        "issue": "broken-meetings",
+        "matches": ["https://www.facebook.com/*", "https://www.messenger.com/*"]
+      }
+    },
+    "interventions": [
+      {
+        "platforms": ["all"],
+        "only_channels": ["nightly"],
+        "content_scripts": {
+          "all_frames": true,
+          "js": ["bug1913599-shim-createencodedstreams.js"]
+        }
+      }
+    ]
+  },
+  "1896424": {
+    "label": "meet.google.com legacy group calls (exploratory)",
+    "bugs": {
+      "1896424": {
+        "issue": "broken-meetings",
+        "matches": ["https://meet.google.com/calling/*"]
+      }
+    },
+    "interventions": [
+      {
+        "platforms": [],
+        "only_channels": ["nightly"],
+        "not_platforms": ["android"],
+        "ua_string": ["Chrome_with_FxQuantum"],
+        "content_scripts": {
+          "all_frames": true,
+          "js": ["bug1913599-shim-createencodedstreams.js"]
+        }
+      }
+    ]
+  },
+  "1902507": {
+    "label": "riverside.fm",
+    "bugs": {
+      "1902507": {
+        "issue": "broken-meetings",
+        "matches": ["https://riverside.fm/*"]
+      }
+    },
+    "interventions": [
+      {
+        "platforms": ["all"],
+        "only_channels": ["nightly"],
+        "content_scripts": {
+          "all_frames": true,
+          "js": ["bug1913599-shim-createencodedstreams.js"]
+        }
+      }
+    ]
+  },
+  "1902508": {
+    "label": "goto.com",
+    "bugs": {
+      "1902508": {
+        "issue": "broken-meetings",
+        "matches": ["https://*.goto.com/*"]
+      }
+    },
+    "interventions": [
+      {
+        "platforms": ["all"],
+        "only_channels": ["nightly"],
+        "content_scripts": {
+          "all_frames": true,
+          "js": ["bug1913599-shim-createencodedstreams.js"]
+        }
+      }
+    ]
+  },
+  "1904141": {
+    "label": "mega.nz",
+    "bugs": {
+      "1904141": {
+        "issue": "broken-meetings",
+        "matches": ["https://mega.nz/*"]
+      }
+    },
+    "interventions": [
+      {
+        "platforms": ["all"],
+        "only_channels": ["nightly"],
+        "content_scripts": {
+          "all_frames": true,
+          "js": ["bug1913599-shim-createencodedstreams.js"]
+        }
+      }
+    ]
+  },
   "1973019": {
     "label": "mitsukoshi.mistore.jp",
     "bugs": {
diff --git a/browser/extensions/webcompat/injections/js/bug1913599-shim-createencodedstreams.js b/browser/extensions/webcompat/injections/js/bug1913599-shim-createencodedstreams.js
@@ -0,0 +1,92 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Bug 1913599 - Sites that depend on legacy createEncodedStreams()
+ *
+ * Several websites that offer end-to-end encrypted communication in
+ * Chrome fail to work in Firefox, either ghosting the button that
+ * offers this feature or erroring with a message like "Voice/Video
+ * calling is not supported on this browser".
+ *
+ * These webpages rely on the older Chrome-only createEncodedStreams()
+ * API instead of the standard RTCRtpScriptTransform API now available
+ * in all browsers. The following shims the former using the latter.
+ *
+ * Note: this shim has inherent performance limitations being on
+ * main thread. Websites are encouraged to upgrade to the standard
+ * worker-based API directly for optimal performance in Firefox.
+ */
+
+/* globals exportFunction, cloneInto */
+
+console.info(
+  "createEncodedStreams() is being shimmed for compatibility reasons. Please consider updating to the RTCRtpScriptTransform API for optimal performance! See https://bugzil.la/1913599 for details."
+);
+
+const win = window.wrappedJSObject;
+if (!win.RTCRtpSender.prototype.createEncodedStreams) {
+  win.RTCRtpSender.prototype.createEncodedStreams =
+    win.RTCRtpReceiver.prototype.createEncodedStreams = exportFunction(
+      function createEncodedStreams() {
+        let onrtctransform; // appease linter
+        function work() {
+          const originals = [];
+          onrtctransform = async ({ transformer: { readable, writable } }) => {
+            const diverter = new TransformStream({
+              transform: (original, controller) => {
+                originals.push(original);
+                controller.enqueue(original);
+              },
+            });
+            const reinserter = new TransformStream({
+              transform: (frame, controller) => {
+                const original = originals.shift();
+                original.data = frame.data;
+                controller.enqueue(original);
+              },
+            });
+            self.postMessage(
+              { readable: diverter.readable, writable: reinserter.writable },
+              { transfer: [diverter.readable, reinserter.writable] }
+            );
+            await readable
+              .pipeThrough({
+                writable: diverter.writable,
+                readable: reinserter.readable,
+              })
+              .pipeTo(writable);
+          };
+        }
+        this._worker = new Worker(
+          `data:text/javascript,(${work.toString()})()`
+        );
+        this.transform = new window.RTCRtpScriptTransform(this._worker);
+        this._dummy = onrtctransform; // appease linter
+        const readableNow = new TransformStream();
+        const writableNow = new TransformStream();
+        const haveData = new Promise(
+          r => (this._worker.onmessage = e => r(e.data))
+        );
+        haveData
+          .then(({ readable }) => readable.pipeTo(readableNow.writable))
+          .catch(e => readableNow.writable.abort(e));
+        haveData
+          .then(({ writable }) => writableNow.readable.pipeTo(writable))
+          .catch(e => writableNow.readable.cancel(e));
+
+        const result = new win.Object();
+        result.readable = cloneInto(readableNow.readable, window, {
+          wrapReflectors: true,
+        });
+        result.writable = cloneInto(writableNow.writable, window, {
+          wrapReflectors: true,
+        });
+        return result;
+      },
+      window
+    );
+}