fune/dom/ipc/jsactor/JSWindowActorChild.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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/. */

#include "mozilla/dom/JSWindowActorBinding.h"
#include "mozilla/dom/JSWindowActorChild.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/WindowGlobalChild.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/dom/WindowProxyHolder.h"
#include "mozilla/dom/MessageManagerBinding.h"
#include "mozilla/dom/BrowsingContext.h"
#include "nsGlobalWindowInner.h"

namespace mozilla::dom {

JSWindowActorChild::~JSWindowActorChild() { MOZ_ASSERT(!mManager); }

JSObject* JSWindowActorChild::WrapObject(JSContext* aCx,
                                         JS::Handle<JSObject*> aGivenProto) {
  return JSWindowActorChild_Binding::Wrap(aCx, this, aGivenProto);
}

WindowGlobalChild* JSWindowActorChild::GetManager() const { return mManager; }

void JSWindowActorChild::Init(const nsACString& aName,
                              WindowGlobalChild* aManager) {
  MOZ_ASSERT(!mManager, "Cannot Init() a JSWindowActorChild twice!");
  SetName(aName);
  mManager = aManager;

  InvokeCallback(CallbackFunction::ActorCreated);
}

void JSWindowActorChild::SendRawMessage(
    const JSActorMessageMeta& aMeta, Maybe<ipc::StructuredCloneData>&& aData,
    Maybe<ipc::StructuredCloneData>&& aStack, ErrorResult& aRv) {
  if (NS_WARN_IF(!CanSend() || !mManager || !mManager->CanSend())) {
    aRv.ThrowInvalidStateError("JSWindowActorChild cannot send at the moment");
    return;
  }

  if (mManager->IsInProcess()) {
    SendRawMessageInProcess(
        aMeta, std::move(aData), std::move(aStack),
        [manager{mManager}]() { return manager->GetParentActor(); });
    return;
  }

  size_t length = 0;
  if (aData) {
    length += aData->DataLength();
  }
  if (aStack) {
    length += aStack->DataLength();
  }

  if (NS_WARN_IF(!AllowMessage(aMeta, length))) {
    aRv.ThrowDataCloneError(
        nsPrintfCString("JSWindowActorChild serialization error: data too "
                        "large, in actor '%s'",
                        PromiseFlatCString(aMeta.actorName()).get()));
    return;
  }

  // Cross-process case - send data over WindowGlobalChild to other side.
  ContentChild* cc = ContentChild::GetSingleton();
  Maybe<ClonedMessageData> msgData;
  if (aData) {
    msgData.emplace();
    if (NS_WARN_IF(!aData->BuildClonedMessageDataForChild(cc, *msgData))) {
      aRv.ThrowDataCloneError(
          nsPrintfCString("JSWindowActorChild serialization error: cannot "
                          "clone, in actor '%s'",
                          PromiseFlatCString(aMeta.actorName()).get()));
      return;
    }
  }

  Maybe<ClonedMessageData> stackData;
  if (aStack) {
    stackData.emplace();
    if (!aStack->BuildClonedMessageDataForChild(cc, *stackData)) {
      stackData.reset();
    }
  }

  if (NS_WARN_IF(!mManager->SendRawMessage(aMeta, msgData, stackData))) {
    aRv.ThrowOperationError(
        nsPrintfCString("JSWindowActorChild send error in actor '%s'",
                        PromiseFlatCString(aMeta.actorName()).get()));
    return;
  }
}

Document* JSWindowActorChild::GetDocument(ErrorResult& aRv) {
  if (!mManager) {
    ThrowStateErrorForGetter("document", aRv);
    return nullptr;
  }

  nsGlobalWindowInner* window = mManager->GetWindowGlobal();
  return window ? window->GetDocument() : nullptr;
}

BrowsingContext* JSWindowActorChild::GetBrowsingContext(ErrorResult& aRv) {
  if (!mManager) {
    ThrowStateErrorForGetter("browsingContext", aRv);
    return nullptr;
  }

  return mManager->BrowsingContext();
}

nsIDocShell* JSWindowActorChild::GetDocShell(ErrorResult& aRv) {
  if (!mManager) {
    ThrowStateErrorForGetter("docShell", aRv);
    return nullptr;
  }

  return mManager->BrowsingContext()->GetDocShell();
}

Nullable<WindowProxyHolder> JSWindowActorChild::GetContentWindow(
    ErrorResult& aRv) {
  if (!mManager) {
    ThrowStateErrorForGetter("contentWindow", aRv);
    return nullptr;
  }

  if (nsGlobalWindowInner* window = mManager->GetWindowGlobal()) {
    if (window->IsCurrentInnerWindow()) {
      return WindowProxyHolder(window->GetBrowsingContext());
    }
  }

  return nullptr;
}

void JSWindowActorChild::ClearManager() { mManager = nullptr; }

NS_IMPL_CYCLE_COLLECTION_INHERITED(JSWindowActorChild, JSActor, mManager)

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(JSWindowActorChild, JSActor)
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JSWindowActorChild)
NS_INTERFACE_MAP_END_INHERITING(JSActor)

NS_IMPL_ADDREF_INHERITED(JSWindowActorChild, JSActor)
NS_IMPL_RELEASE_INHERITED(JSWindowActorChild, JSActor)

}  // namespace mozilla::dom