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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
#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
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);
}