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/* -*- 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/ProcessActor.h"
#include "nsContentUtils.h"
#include "mozJSComponentLoader.h"
#include "mozilla/ContentBlockingAllowList.h"
#include "mozilla/Logging.h"
#include "mozilla/dom/JSActorService.h"
#include "mozilla/dom/JSProcessActorParent.h"
#include "mozilla/dom/JSProcessActorChild.h"
namespace mozilla {
namespace dom {
void ProcessActor::ConstructActor(const nsACString& aName,
JS::MutableHandleObject aActor,
ErrorResult& aRv) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
JSActor::Type actorType = GetSide();
MOZ_ASSERT_IF(actorType == JSActor::Type::Parent, XRE_IsParentProcess());
// Constructing an actor requires a running script, so push an AutoEntryScript
// onto the stack.
AutoEntryScript aes(xpc::PrivilegedJunkScope(), "ProcessActor construction");
JSContext* cx = aes.cx();
RefPtr<JSActorService> actorSvc = JSActorService::GetSingleton();
if (!actorSvc) {
aRv.ThrowInvalidStateError(
"While constructing JSProcessActor, could not acquire JSActorService.");
return;
}
RefPtr<JSProcessActorProtocol> proto =
actorSvc->GetJSProcessActorProtocol(aName);
if (!proto) {
aRv.ThrowNotFoundError(nsPrintfCString("No such JSProcessActor '%s'",
PromiseFlatCString(aName).get()));
return;
}
if (!proto->Matches(GetRemoteType())) {
aRv.ThrowTypeMismatchError(
nsPrintfCString("JSProcessActor '%s' does not match this process",
PromiseFlatCString(aName).get()));
return;
}
// Load the module using mozJSComponentLoader.
RefPtr<mozJSComponentLoader> loader = mozJSComponentLoader::Get();
MOZ_ASSERT(loader);
JS::RootedObject global(cx);
JS::RootedObject exports(cx);
const JSProcessActorProtocol::Sided* side;
if (actorType == JSActor::Type::Parent) {
side = &proto->Parent();
} else {
side = &proto->Child();
}
// Support basic functionally such as SendAsyncMessage and SendQuery for
// unspecified moduleURI.
if (!side->mModuleURI) {
RefPtr<JSActor> actor;
if (actorType == JSActor::Type::Parent) {
actor = new JSProcessActorParent();
} else {
actor = new JSProcessActorChild();
}
JS::Rooted<JS::Value> wrapper(cx);
if (!ToJSValue(cx, actor, &wrapper)) {
aRv.NoteJSContextException(cx);
return;
}
MOZ_ASSERT(wrapper.isObject());
aActor.set(&wrapper.toObject());
return;
}
aRv = loader->Import(cx, side->mModuleURI.ref(), &global, &exports);
if (aRv.Failed()) {
return;
}
MOZ_ASSERT(exports, "null exports!");
// Load the specific property from our module.
JS::RootedValue ctor(cx);
nsAutoCString ctorName(aName);
ctorName.Append(actorType == JSActor::Type::Parent
? NS_LITERAL_CSTRING("Parent")
: NS_LITERAL_CSTRING("Child"));
if (!JS_GetProperty(cx, exports, ctorName.get(), &ctor)) {
aRv.NoteJSContextException(cx);
return;
}
if (NS_WARN_IF(!ctor.isObject())) {
nsPrintfCString message("Could not find actor constructor '%s'",
PromiseFlatCString(ctorName).get());
aRv.ThrowNotFoundError(message);
return;
}
// Invoke the constructor loaded from the module.
if (!JS::Construct(cx, ctor, JS::HandleValueArray::empty(), aActor)) {
aRv.NoteJSContextException(cx);
return;
}
}
} // namespace dom
} // namespace mozilla
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