1 files changed, 126 insertions, 0 deletions
diff --git a/dom/base/PostMessageEvent.h b/dom/base/PostMessageEvent.h
new file mode 100644
index 0000000000..48c4c429c7
--- /dev/null
+++ b/dom/base/PostMessageEvent.h
@@ -0,0 +1,126 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_dom_PostMessageEvent_h
+#define mozilla_dom_PostMessageEvent_h
+
+#include "js/StructuredClone.h"
+#include "js/TypeDecls.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "mozilla/dom/StructuredCloneHolder.h"
+#include "nsCOMPtr.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/MaybeOneOf.h"
+#include "mozilla/RefPtr.h"
+#include "nsThreadUtils.h"
+
+class nsGlobalWindowOuter;
+class nsGlobalWindowInner;
+class nsIPrincipal;
+class nsIURI;
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class BrowsingContext;
+class Event;
+class EventTarget;
+
+/**
+ * Class used to represent events generated by calls to Window.postMessage,
+ * which asynchronously creates and dispatches events.
+ */
+class PostMessageEvent final : public Runnable {
+ public:
+  NS_DECL_NSIRUNNABLE
+
+  // aCallerWindowID should not be 0.
+  PostMessageEvent(BrowsingContext* aSource, const nsAString& aCallerOrigin,
+                   nsGlobalWindowOuter* aTargetWindow,
+                   nsIPrincipal* aProvidedPrincipal, uint64_t aCallerWindowID,
+                   nsIURI* aCallerURI, const nsCString& aScriptLocation,
+                   const Maybe<nsID>& aCallerAgentClusterId)
+      : PostMessageEvent(aSource, aCallerOrigin, aTargetWindow,
+                         aProvidedPrincipal, aCallerWindowID, aCallerURI,
+                         aScriptLocation, false, aCallerAgentClusterId) {}
+
+  // To be used when the caller's window lives in a different process.
+  PostMessageEvent(BrowsingContext* aSource, const nsAString& aCallerOrigin,
+                   nsGlobalWindowOuter* aTargetWindow,
+                   nsIPrincipal* aProvidedPrincipal, uint64_t aCallerWindowID,
+                   nsIURI* aCallerURI, const nsCString& aScriptLocation,
+                   bool aIsFromPrivateWindow)
+      : PostMessageEvent(aSource, aCallerOrigin, aTargetWindow,
+                         aProvidedPrincipal, aCallerWindowID, aCallerURI,
+                         aScriptLocation, aIsFromPrivateWindow, Nothing()) {}
+
+  void Write(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+             JS::Handle<JS::Value> aTransfer,
+             const JS::CloneDataPolicy& aClonePolicy, ErrorResult& aError) {
+    mHolder.construct<StructuredCloneHolder>(
+        StructuredCloneHolder::CloningSupported,
+        StructuredCloneHolder::TransferringSupported,
+        JS::StructuredCloneScope::SameProcess);
+    mHolder.ref<StructuredCloneHolder>().Write(aCx, aMessage, aTransfer,
+                                               aClonePolicy, aError);
+  }
+  void UnpackFrom(const ClonedOrErrorMessageData& aMessageData) {
+    if (aMessageData.type() != ClonedOrErrorMessageData::TClonedMessageData) {
+      return;
+    }
+
+    mHolder.construct<ipc::StructuredCloneData>();
+    // FIXME Want to steal!
+    //       See https://bugzilla.mozilla.org/show_bug.cgi?id=1516349.
+    mHolder.ref<ipc::StructuredCloneData>().CopyFromClonedMessageData(
+        aMessageData);
+  }
+
+  void DispatchToTargetThread(ErrorResult& aError);
+
+ private:
+  PostMessageEvent(BrowsingContext* aSource, const nsAString& aCallerOrigin,
+                   nsGlobalWindowOuter* aTargetWindow,
+                   nsIPrincipal* aProvidedPrincipal, uint64_t aCallerWindowID,
+                   nsIURI* aCallerURI, const nsCString& aScriptLocation,
+                   bool aIsFromPrivateWindow,
+                   const Maybe<nsID>& aCallerAgentClusterId);
+  ~PostMessageEvent();
+
+  MOZ_CAN_RUN_SCRIPT void Dispatch(nsGlobalWindowInner* aTargetWindow,
+                                   Event* aEvent);
+
+  // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void DispatchError(
+      JSContext* aCx, nsGlobalWindowInner* aTargetWindow,
+      mozilla::dom::EventTarget* aEventTarget);
+
+  RefPtr<BrowsingContext> mSource;
+  nsString mCallerOrigin;
+  RefPtr<nsGlobalWindowOuter> mTargetWindow;
+  nsCOMPtr<nsIPrincipal> mProvidedPrincipal;
+  // If the postMessage call was made on a WindowProxy whose Window lives in a
+  // separate process then mHolder will contain a StructuredCloneData, else
+  // it'll contain a StructuredCloneHolder.
+  MaybeOneOf<StructuredCloneHolder, ipc::StructuredCloneData> mHolder;
+  uint64_t mCallerWindowID;
+  const Maybe<nsID> mCallerAgentClusterId;
+  nsCOMPtr<nsIURI> mCallerURI;
+  // if callerURI is null, then we can use script location for reporting errors
+  // to console
+  const Maybe<nsCString> mScriptLocation;
+  // This is only set to a relevant value if mCallerWindowID doesn't contain a
+  // value.
+  bool mIsFromPrivateWindow;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_PostMessageEvent_h