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-rw-r--r--dom/base/nsIGlobalObject.cpp420
1 files changed, 420 insertions, 0 deletions
diff --git a/dom/base/nsIGlobalObject.cpp b/dom/base/nsIGlobalObject.cpp
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+++ b/dom/base/nsIGlobalObject.cpp
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+/* -*- 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/. */
+
+#include "nsIGlobalObject.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/GlobalTeardownObserver.h"
+#include "mozilla/Result.h"
+#include "mozilla/StorageAccess.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/BlobURLProtocolHandler.h"
+#include "mozilla/dom/FunctionBinding.h"
+#include "mozilla/dom/Report.h"
+#include "mozilla/dom/ReportingObserver.h"
+#include "mozilla/dom/ServiceWorker.h"
+#include "mozilla/dom/ServiceWorkerRegistration.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "nsContentUtils.h"
+#include "nsThreadUtils.h"
+#include "nsGlobalWindowInner.h"
+
+// Max number of Report objects
+constexpr auto MAX_REPORT_RECORDS = 100;
+
+using mozilla::AutoSlowOperation;
+using mozilla::CycleCollectedJSContext;
+using mozilla::DOMEventTargetHelper;
+using mozilla::ErrorResult;
+using mozilla::GlobalTeardownObserver;
+using mozilla::IgnoredErrorResult;
+using mozilla::MallocSizeOf;
+using mozilla::Maybe;
+using mozilla::MicroTaskRunnable;
+using mozilla::dom::BlobURLProtocolHandler;
+using mozilla::dom::CallerType;
+using mozilla::dom::ClientInfo;
+using mozilla::dom::Report;
+using mozilla::dom::ReportingObserver;
+using mozilla::dom::ServiceWorker;
+using mozilla::dom::ServiceWorkerDescriptor;
+using mozilla::dom::ServiceWorkerRegistration;
+using mozilla::dom::ServiceWorkerRegistrationDescriptor;
+using mozilla::dom::VoidFunction;
+
+nsIGlobalObject::nsIGlobalObject()
+ : mIsDying(false), mIsScriptForbidden(false), mIsInnerWindow(false) {}
+
+bool nsIGlobalObject::IsScriptForbidden(JSObject* aCallback,
+ bool aIsJSImplementedWebIDL) const {
+ if (mIsScriptForbidden || mIsDying) {
+ return true;
+ }
+
+ if (NS_IsMainThread()) {
+ if (aIsJSImplementedWebIDL) {
+ return false;
+ }
+
+ if (!xpc::Scriptability::AllowedIfExists(aCallback)) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+nsIGlobalObject::~nsIGlobalObject() {
+ UnlinkObjectsInGlobal();
+ DisconnectGlobalTeardownObservers();
+ MOZ_DIAGNOSTIC_ASSERT(mGlobalTeardownObservers.isEmpty());
+}
+
+nsIPrincipal* nsIGlobalObject::PrincipalOrNull() const {
+ JSObject* global = GetGlobalJSObjectPreserveColor();
+ if (NS_WARN_IF(!global)) return nullptr;
+
+ return nsContentUtils::ObjectPrincipal(global);
+}
+
+void nsIGlobalObject::RegisterHostObjectURI(const nsACString& aURI) {
+ MOZ_ASSERT(!mHostObjectURIs.Contains(aURI));
+ mHostObjectURIs.AppendElement(aURI);
+}
+
+void nsIGlobalObject::UnregisterHostObjectURI(const nsACString& aURI) {
+ mHostObjectURIs.RemoveElement(aURI);
+}
+
+namespace {
+
+class UnlinkHostObjectURIsRunnable final : public mozilla::Runnable {
+ public:
+ explicit UnlinkHostObjectURIsRunnable(nsTArray<nsCString>&& aURIs)
+ : mozilla::Runnable("UnlinkHostObjectURIsRunnable"),
+ mURIs(std::move(aURIs)) {}
+
+ NS_IMETHOD Run() override {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ for (uint32_t index = 0; index < mURIs.Length(); ++index) {
+ BlobURLProtocolHandler::RemoveDataEntry(mURIs[index]);
+ }
+
+ return NS_OK;
+ }
+
+ private:
+ ~UnlinkHostObjectURIsRunnable() = default;
+
+ const nsTArray<nsCString> mURIs;
+};
+
+} // namespace
+
+void nsIGlobalObject::UnlinkObjectsInGlobal() {
+ if (!mHostObjectURIs.IsEmpty()) {
+ // BlobURLProtocolHandler is main-thread only.
+ if (NS_IsMainThread()) {
+ for (uint32_t index = 0; index < mHostObjectURIs.Length(); ++index) {
+ BlobURLProtocolHandler::RemoveDataEntry(mHostObjectURIs[index]);
+ }
+
+ mHostObjectURIs.Clear();
+ } else {
+ RefPtr<UnlinkHostObjectURIsRunnable> runnable =
+ new UnlinkHostObjectURIsRunnable(std::move(mHostObjectURIs));
+ MOZ_ASSERT(mHostObjectURIs.IsEmpty());
+
+ nsresult rv = NS_DispatchToMainThread(runnable);
+ if (NS_FAILED(rv)) {
+ NS_WARNING("Failed to dispatch a runnable to the main-thread.");
+ }
+ }
+ }
+
+ mReportRecords.Clear();
+ mReportingObservers.Clear();
+ mCountQueuingStrategySizeFunction = nullptr;
+ mByteLengthQueuingStrategySizeFunction = nullptr;
+}
+
+void nsIGlobalObject::TraverseObjectsInGlobal(
+ nsCycleCollectionTraversalCallback& cb) {
+ // Currently we only store BlobImpl objects off the the main-thread and they
+ // are not CCed.
+ if (!mHostObjectURIs.IsEmpty() && NS_IsMainThread()) {
+ for (uint32_t index = 0; index < mHostObjectURIs.Length(); ++index) {
+ BlobURLProtocolHandler::Traverse(mHostObjectURIs[index], cb);
+ }
+ }
+
+ nsIGlobalObject* tmp = this;
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReportRecords)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReportingObservers)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCountQueuingStrategySizeFunction)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mByteLengthQueuingStrategySizeFunction)
+}
+
+void nsIGlobalObject::AddGlobalTeardownObserver(
+ GlobalTeardownObserver* aObject) {
+ MOZ_DIAGNOSTIC_ASSERT(aObject);
+ MOZ_ASSERT(!aObject->isInList());
+ mGlobalTeardownObservers.insertBack(aObject);
+}
+
+void nsIGlobalObject::RemoveGlobalTeardownObserver(
+ GlobalTeardownObserver* aObject) {
+ MOZ_DIAGNOSTIC_ASSERT(aObject);
+ MOZ_ASSERT(aObject->isInList());
+ MOZ_ASSERT(aObject->GetOwnerGlobal() == this);
+ aObject->remove();
+}
+
+void nsIGlobalObject::ForEachGlobalTeardownObserver(
+ const std::function<void(GlobalTeardownObserver*, bool* aDoneOut)>& aFunc)
+ const {
+ // Protect against the function call triggering a mutation of the list
+ // while we are iterating by copying the DETH references to a temporary
+ // list.
+ AutoTArray<RefPtr<GlobalTeardownObserver>, 64> targetList;
+ for (const GlobalTeardownObserver* gto = mGlobalTeardownObservers.getFirst();
+ gto; gto = gto->getNext()) {
+ targetList.AppendElement(const_cast<GlobalTeardownObserver*>(gto));
+ }
+
+ // Iterate the target list and call the function on each one.
+ bool done = false;
+ for (auto& target : targetList) {
+ // Check to see if a previous iteration's callback triggered the removal
+ // of this target as a side-effect. If it did, then just ignore it.
+ if (target->GetOwnerGlobal() != this) {
+ continue;
+ }
+ aFunc(target, &done);
+ if (done) {
+ break;
+ }
+ }
+}
+
+void nsIGlobalObject::DisconnectGlobalTeardownObservers() {
+ ForEachGlobalTeardownObserver(
+ [&](GlobalTeardownObserver* aTarget, bool* aDoneOut) {
+ aTarget->DisconnectFromOwner();
+
+ // Calling DisconnectFromOwner() should result in
+ // RemoveGlobalTeardownObserver() being called.
+ MOZ_DIAGNOSTIC_ASSERT(aTarget->GetOwnerGlobal() != this);
+ });
+}
+
+Maybe<ClientInfo> nsIGlobalObject::GetClientInfo() const {
+ // By default globals do not expose themselves as a client. Only real
+ // window and worker globals are currently considered clients.
+ return Maybe<ClientInfo>();
+}
+
+Maybe<nsID> nsIGlobalObject::GetAgentClusterId() const {
+ Maybe<ClientInfo> ci = GetClientInfo();
+ if (ci.isSome()) {
+ return ci.value().AgentClusterId();
+ }
+ return mozilla::Nothing();
+}
+
+Maybe<ServiceWorkerDescriptor> nsIGlobalObject::GetController() const {
+ // By default globals do not have a service worker controller. Only real
+ // window and worker globals can currently be controlled as a client.
+ return Maybe<ServiceWorkerDescriptor>();
+}
+
+RefPtr<ServiceWorker> nsIGlobalObject::GetOrCreateServiceWorker(
+ const ServiceWorkerDescriptor& aDescriptor) {
+ MOZ_DIAGNOSTIC_ASSERT(false,
+ "this global should not have any service workers");
+ return nullptr;
+}
+
+RefPtr<ServiceWorkerRegistration> nsIGlobalObject::GetServiceWorkerRegistration(
+ const mozilla::dom::ServiceWorkerRegistrationDescriptor& aDescriptor)
+ const {
+ MOZ_DIAGNOSTIC_ASSERT(false,
+ "this global should not have any service workers");
+ return nullptr;
+}
+
+RefPtr<ServiceWorkerRegistration>
+nsIGlobalObject::GetOrCreateServiceWorkerRegistration(
+ const ServiceWorkerRegistrationDescriptor& aDescriptor) {
+ MOZ_DIAGNOSTIC_ASSERT(
+ false, "this global should not have any service worker registrations");
+ return nullptr;
+}
+
+mozilla::StorageAccess nsIGlobalObject::GetStorageAccess() {
+ return mozilla::StorageAccess::eDeny;
+}
+
+nsPIDOMWindowInner* nsIGlobalObject::GetAsInnerWindow() {
+ if (MOZ_LIKELY(mIsInnerWindow)) {
+ return static_cast<nsPIDOMWindowInner*>(
+ static_cast<nsGlobalWindowInner*>(this));
+ }
+ return nullptr;
+}
+
+size_t nsIGlobalObject::ShallowSizeOfExcludingThis(MallocSizeOf aSizeOf) const {
+ size_t rtn = mHostObjectURIs.ShallowSizeOfExcludingThis(aSizeOf);
+ return rtn;
+}
+
+class QueuedMicrotask : public MicroTaskRunnable {
+ public:
+ QueuedMicrotask(nsIGlobalObject* aGlobal, VoidFunction& aCallback)
+ : mGlobal(aGlobal), mCallback(&aCallback) {}
+
+ MOZ_CAN_RUN_SCRIPT_BOUNDARY void Run(AutoSlowOperation& aAso) final {
+ IgnoredErrorResult rv;
+ MOZ_KnownLive(mCallback)->Call(static_cast<ErrorResult&>(rv));
+ }
+
+ bool Suppressed() final { return mGlobal->IsInSyncOperation(); }
+
+ private:
+ nsCOMPtr<nsIGlobalObject> mGlobal;
+ RefPtr<VoidFunction> mCallback;
+};
+
+void nsIGlobalObject::QueueMicrotask(VoidFunction& aCallback) {
+ CycleCollectedJSContext* context = CycleCollectedJSContext::Get();
+ if (context) {
+ RefPtr<MicroTaskRunnable> mt = new QueuedMicrotask(this, aCallback);
+ context->DispatchToMicroTask(mt.forget());
+ }
+}
+
+void nsIGlobalObject::RegisterReportingObserver(ReportingObserver* aObserver,
+ bool aBuffered) {
+ MOZ_ASSERT(aObserver);
+
+ if (mReportingObservers.Contains(aObserver)) {
+ return;
+ }
+
+ if (NS_WARN_IF(
+ !mReportingObservers.AppendElement(aObserver, mozilla::fallible))) {
+ return;
+ }
+
+ if (!aBuffered) {
+ return;
+ }
+
+ for (Report* report : mReportRecords) {
+ aObserver->MaybeReport(report);
+ }
+}
+
+void nsIGlobalObject::UnregisterReportingObserver(
+ ReportingObserver* aObserver) {
+ MOZ_ASSERT(aObserver);
+ mReportingObservers.RemoveElement(aObserver);
+}
+
+void nsIGlobalObject::BroadcastReport(Report* aReport) {
+ MOZ_ASSERT(aReport);
+
+ for (ReportingObserver* observer : mReportingObservers) {
+ observer->MaybeReport(aReport);
+ }
+
+ if (NS_WARN_IF(!mReportRecords.AppendElement(aReport, mozilla::fallible))) {
+ return;
+ }
+
+ while (mReportRecords.Length() > MAX_REPORT_RECORDS) {
+ mReportRecords.RemoveElementAt(0);
+ }
+}
+
+void nsIGlobalObject::NotifyReportingObservers() {
+ for (auto& observer : mReportingObservers.Clone()) {
+ // MOZ_KnownLive because the clone of 'mReportingObservers' is guaranteed to
+ // keep it alive.
+ //
+ // This can go away once
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=1620312 is fixed.
+ MOZ_KnownLive(observer)->MaybeNotify();
+ }
+}
+
+void nsIGlobalObject::RemoveReportRecords() {
+ mReportRecords.Clear();
+
+ for (auto& observer : mReportingObservers) {
+ observer->ForgetReports();
+ }
+}
+
+already_AddRefed<mozilla::dom::Function>
+nsIGlobalObject::GetCountQueuingStrategySizeFunction() {
+ return do_AddRef(mCountQueuingStrategySizeFunction);
+}
+
+void nsIGlobalObject::SetCountQueuingStrategySizeFunction(
+ mozilla::dom::Function* aFunction) {
+ mCountQueuingStrategySizeFunction = aFunction;
+}
+
+already_AddRefed<mozilla::dom::Function>
+nsIGlobalObject::GetByteLengthQueuingStrategySizeFunction() {
+ return do_AddRef(mByteLengthQueuingStrategySizeFunction);
+}
+
+void nsIGlobalObject::SetByteLengthQueuingStrategySizeFunction(
+ mozilla::dom::Function* aFunction) {
+ mByteLengthQueuingStrategySizeFunction = aFunction;
+}
+
+mozilla::Result<mozilla::ipc::PrincipalInfo, nsresult>
+nsIGlobalObject::GetStorageKey() {
+ return mozilla::Err(NS_ERROR_NOT_AVAILABLE);
+}
+
+mozilla::Result<bool, nsresult> nsIGlobalObject::HasEqualStorageKey(
+ const mozilla::ipc::PrincipalInfo& aStorageKey) {
+ auto result = GetStorageKey();
+ if (result.isErr()) {
+ return result.propagateErr();
+ }
+
+ const auto& storageKey = result.inspect();
+
+ return mozilla::ipc::StorageKeysEqual(storageKey, aStorageKey);
+}
+
+mozilla::RTPCallerType nsIGlobalObject::GetRTPCallerType() const {
+ if (PrincipalOrNull() && PrincipalOrNull()->IsSystemPrincipal()) {
+ return RTPCallerType::SystemPrincipal;
+ }
+
+ if (ShouldResistFingerprinting(RFPTarget::ReduceTimerPrecision)) {
+ return RTPCallerType::ResistFingerprinting;
+ }
+
+ if (CrossOriginIsolated()) {
+ return RTPCallerType::CrossOriginIsolated;
+ }
+
+ return RTPCallerType::Normal;
+}
+
+bool nsIGlobalObject::ShouldResistFingerprinting(CallerType aCallerType,
+ RFPTarget aTarget) const {
+ return aCallerType != CallerType::System &&
+ ShouldResistFingerprinting(aTarget);
+}