Bug 1591892 - Expose {window, self}.crossOriginIsolated r=bzbarsky

Differential Revision: https://phabricator.services.mozilla.com/D52532

--HG--
extra : moz-landing-system : lando

dom/base/nsGlobalWindowInner.cpp

@@ -2359,7 +2359,7 @@ void nsGlobalWindowInner::UpdateTopInnerWindow() {
   mTopInnerWindow->UpdateWebSocketCount(-(int32_t)mNumOfOpenWebSockets);
 }
 
-bool nsGlobalWindowInner::IsCrossOriginIsolated() const {
+bool nsGlobalWindowInner::IsSharedMemoryAllowed() const {
   MOZ_ASSERT(NS_IsMainThread());
 
   if (StaticPrefs::
@@ -2367,6 +2367,12 @@ bool nsGlobalWindowInner::IsCrossOriginIsolated() const {
     return true;
   }
 
+  return CrossOriginIsolated();
+}
+
+bool nsGlobalWindowInner::CrossOriginIsolated() const {
+  MOZ_ASSERT(NS_IsMainThread());
+
   if (!StaticPrefs::dom_postMessage_sharedArrayBuffer_withCOOP_COEP()) {
     return false;
   }

dom/base/nsGlobalWindowInner.h

@@ -940,8 +940,10 @@ class nsGlobalWindowInner final : public mozilla::dom::EventTarget,
     return GetExtantDoc() && GetExtantDoc()->IsInSyncOperation();
   }
 
+  bool IsSharedMemoryAllowed() const;
+
   // https://whatpr.org/html/4734/structured-data.html#cross-origin-isolated
-  bool IsCrossOriginIsolated() const;
+  bool CrossOriginIsolated() const;
 
  protected:
   // Web IDL helpers

dom/base/nsGlobalWindowOuter.cpp

@@ -6058,7 +6058,7 @@ void nsGlobalWindowOuter::PostMessageMozOuter(JSContext* aCx,
 
   JS::CloneDataPolicy clonePolicy;
   if (GetDocGroup() && callerInnerWindow &&
-      callerInnerWindow->IsCrossOriginIsolated()) {
+      callerInnerWindow->IsSharedMemoryAllowed()) {
     clonePolicy.allowSharedMemory();
   }
   event->Write(aCx, aMessage, aTransfer, clonePolicy, aError);

dom/webidl/WindowOrWorkerGlobalScope.webidl

@@ -14,6 +14,7 @@
 [Exposed=(Window,Worker)]
 interface mixin WindowOrWorkerGlobalScope {
   [Replaceable] readonly attribute USVString origin;
+  readonly attribute boolean crossOriginIsolated;
 
   // base64 utility methods
   [Throws]

dom/workers/Worker.cpp

@@ -104,12 +104,12 @@ void Worker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
   JS::CloneDataPolicy clonePolicy;
   if (NS_IsMainThread()) {
     nsGlobalWindowInner* win = nsContentUtils::CallerInnerWindow();
-    if (win && win->IsCrossOriginIsolated()) {
+    if (win && win->IsSharedMemoryAllowed()) {
       clonePolicy.allowSharedMemory();
     }
   } else {
     WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
-    if (worker && worker->IsCrossOriginIsolated()) {
+    if (worker && worker->IsSharedMemoryAllowed()) {
       clonePolicy.allowSharedMemory();
     }
   }

dom/workers/WorkerPrivate.cpp

@@ -3950,7 +3950,7 @@ void WorkerPrivate::PostMessageToParent(
   }
 
   JS::CloneDataPolicy clonePolicy;
-  if (IsCrossOriginIsolated()) {
+  if (IsSharedMemoryAllowed()) {
     clonePolicy.allowSharedMemory();
   }
   runnable->Write(aCx, aMessage, transferable, clonePolicy, aRv);
@@ -4974,7 +4974,7 @@ const nsAString& WorkerPrivate::Id() {
   return mId;
 }
 
-bool WorkerPrivate::IsCrossOriginIsolated() const {
+bool WorkerPrivate::IsSharedMemoryAllowed() const {
   AssertIsOnWorkerThread();
 
   if (StaticPrefs::
@@ -4982,6 +4982,12 @@ bool WorkerPrivate::IsCrossOriginIsolated() const {
     return true;
   }
 
+  return CrossOriginIsolated();
+}
+
+bool WorkerPrivate::CrossOriginIsolated() const {
+  AssertIsOnWorkerThread();
+
   if (!StaticPrefs::dom_postMessage_sharedArrayBuffer_withCOOP_COEP()) {
     return false;
   }

dom/workers/WorkerPrivate.h

@@ -896,8 +896,10 @@ class WorkerPrivate : public RelativeTimeline {
 
   const nsID& AgentClusterId() const { return mAgentClusterId; }
 
+  bool IsSharedMemoryAllowed() const;
+
   // https://whatpr.org/html/4734/structured-data.html#cross-origin-isolated
-  bool IsCrossOriginIsolated() const;
+  bool CrossOriginIsolated() const;
 
  private:
   WorkerPrivate(

dom/workers/WorkerScope.cpp

@@ -386,6 +386,10 @@ void WorkerGlobalScope::GetOrigin(nsAString& aOrigin) const {
   aOrigin = mWorkerPrivate->Origin();
 }
 
+bool WorkerGlobalScope::CrossOriginIsolated() const {
+  return mWorkerPrivate->CrossOriginIsolated();
+}
+
 void WorkerGlobalScope::Atob(const nsAString& aAtob, nsAString& aOutput,
                              ErrorResult& aRv) const {
   mWorkerPrivate->AssertIsOnWorkerThread();

dom/workers/WorkerScope.h

@@ -142,6 +142,7 @@ class WorkerGlobalScope : public DOMEventTargetHelper,
   void ClearInterval(int32_t aHandle);
 
   void GetOrigin(nsAString& aOrigin) const;
+  bool CrossOriginIsolated() const;
 
   void Atob(const nsAString& aAtob, nsAString& aOutput, ErrorResult& aRv) const;
   void Btoa(const nsAString& aBtoa, nsAString& aOutput, ErrorResult& aRv) const;