Bug 1657701 - Localize the media control Firefox is now playing fallback text r=alwu,zbraniecki

Differential Revision: https://phabricator.services.mozilla.com/D91514

browser/base/content/test/static/browser_all_files_referenced.js

@@ -223,6 +223,9 @@ var whitelist = [
 
   // services/fxaccounts/RustFxAccount.js
   { file: "resource://gre/modules/RustFxAccount.js" },
+
+  // dom/media/mediacontrol/MediaControlService.cpp
+  { file: "resource://gre/localization/en-US/dom/media.ftl" },
 ];
 
 if (AppConstants.NIGHTLY_BUILD && AppConstants.platform != "win") {

dom/locales/en-US/dom/media.ftl

@@ -0,0 +1,5 @@
+# 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/.
+
+mediastatus-fallback-title = { -brand-short-name } is playing media

dom/locales/jar.mn

@@ -3,6 +3,8 @@
 # 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/.
 
+[localization] @AB_CD@.jar:
+  dom                                                          (%dom/**/*.ftl)
 
 @AB_CD@.jar:
   locale/@AB_CD@/global/css.properties                         (%chrome/layout/css.properties)

dom/media/mediacontrol/MediaControlService.cpp

@@ -6,14 +6,16 @@
 
 #include "MediaController.h"
 #include "MediaControlUtils.h"
-
 #include "mozilla/Assertions.h"
+#include "mozilla/intl/Localization.h"
 #include "mozilla/Logging.h"
 #include "mozilla/Services.h"
 #include "mozilla/StaticPtr.h"
 #include "nsIObserverService.h"
 #include "nsXULAppAPI.h"
 
+using mozilla::intl::Localization;
+
 #undef LOG
 #define LOG(msg, ...)                        \
   MOZ_LOG(gMediaControlLog, LogLevel::Debug, \
@@ -111,6 +113,24 @@ void MediaControlService::Init() {
   MOZ_ASSERT(mMediaControlKeyManager->IsOpened());
   mMediaControlKeyManager->AddListener(mMediaKeysHandler.get());
   mControllerManager = MakeUnique<ControllerManager>(this);
+
+  // Initialize the fallback title
+  nsCOMPtr<nsIGlobalObject> global =
+      xpc::NativeGlobal(xpc::PrivilegedJunkScope());
+  RefPtr<Localization> l10n = Localization::Create(global, true, {});
+  l10n->AddResourceId(u"branding/brand.ftl"_ns);
+  l10n->AddResourceId(u"dom/media.ftl"_ns);
+  {
+    AutoSafeJSContext cx;
+
+    nsAutoCString translation;
+    ErrorResult rv;
+    l10n->FormatValueSync(cx, "mediastatus-fallback-title"_ns, {}, translation,
+                          rv);
+    if (!rv.Failed()) {
+      mFallbackTitle = NS_ConvertUTF8toUTF16(translation);
+    }
+  }
 }
 
 MediaControlService::~MediaControlService() {
@@ -262,6 +282,10 @@ MediaSessionPlaybackState MediaControlService::GetMainControllerPlaybackState()
                              : MediaSessionPlaybackState::None;
 }
 
+nsString MediaControlService::GetFallbackTitle() const {
+  return mFallbackTitle;
+}
+
 // Following functions belong to ControllerManager
 MediaControlService::ControllerManager::ControllerManager(
     MediaControlService* aService)

dom/media/mediacontrol/MediaControlService.h

@@ -82,6 +82,11 @@ class MediaControlService final : public nsIObserver {
   MediaMetadataBase GetMainControllerMediaMetadata() const;
   MediaSessionPlaybackState GetMainControllerPlaybackState() const;
 
+  // Media title that should be used as a fallback. This commonly used
+  // when playing media in private browsing mode and we are trying to avoid
+  // exposing potentially sensitive titles.
+  nsString GetFallbackTitle() const;
+
  private:
   MediaControlService();
   ~MediaControlService();
@@ -166,6 +171,7 @@ class MediaControlService final : public nsIObserver {
   RefPtr<MediaControlKeyListener> mMediaKeysHandler;
   MediaEventProducer<uint64_t> mMediaControllerAmountChangedEvent;
   UniquePtr<ControllerManager> mControllerManager;
+  nsString mFallbackTitle;
 };
 
 }  // namespace dom

dom/media/mediacontrol/MediaStatusManager.cpp

@@ -198,9 +198,8 @@ MediaMetadataBase MediaStatusManager::CreateDefaultMetadata() const {
 }
 
 nsString MediaStatusManager::GetDefaultTitle() const {
-  // TODO : maybe need l10n? (bug1657701)
-  nsString defaultTitle;
-  defaultTitle.AssignLiteral("Firefox is playing media");
+  RefPtr<MediaControlService> service = MediaControlService::GetService();
+  nsString defaultTitle = service->GetFallbackTitle();
 
   RefPtr<CanonicalBrowsingContext> bc =
       CanonicalBrowsingContext::Get(mTopLevelBrowsingContextId);

dom/media/mediacontrol/tests/head.js

@@ -220,13 +220,23 @@ function isCurrentMetadataEqualTo(metadata) {
  * the `options`.
  */
 async function isGivenTabUsingDefaultMetadata(tab, options = {}) {
+  const localization = new Localization([
+    "branding/brand.ftl",
+    "dom/media.ftl",
+  ]);
+  const fallbackTitle = await localization.formatValue(
+    "mediastatus-fallback-title"
+  );
+  ok(fallbackTitle.length > 0, "l10n fallback title is not empty");
+
   const metadata = tab.linkedBrowser.browsingContext.mediaController.getMetadata();
+
   await SpecialPowers.spawn(
     tab.linkedBrowser,
-    [metadata.title, options.isPrivateBrowsing],
-    (title, isPrivateBrowsing) => {
+    [metadata.title, fallbackTitle, options.isPrivateBrowsing],
+    (title, fallbackTitle, isPrivateBrowsing) => {
       if (isPrivateBrowsing || !content.document.title.length) {
-        is(title, "Firefox is playing media", "Using a generic default title");
+        is(title, fallbackTitle, "Using a generic default fallback title");
       } else {
         is(
           title,