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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 "StorageNotifierService.h"
#include "StorageUtils.h"
#include "mozilla/dom/StorageEvent.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/StaticPtr.h"
#include "nsThreadUtils.h"
namespace mozilla::dom {
namespace {
// This boolean is used to avoid the creation of the service after been
// distroyed on shutdown.
bool gStorageShuttingDown = false;
StaticRefPtr<StorageNotifierService> gStorageNotifierService;
} // namespace
/* static */
StorageNotifierService* StorageNotifierService::GetOrCreate() {
MOZ_ASSERT(NS_IsMainThread());
if (!gStorageNotifierService && !gStorageShuttingDown) {
gStorageNotifierService = new StorageNotifierService();
ClearOnShutdown(&gStorageNotifierService);
}
return gStorageNotifierService;
}
StorageNotifierService::StorageNotifierService() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!gStorageNotifierService);
}
StorageNotifierService::~StorageNotifierService() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!gStorageNotifierService);
gStorageShuttingDown = true;
}
/* static */
void StorageNotifierService::Broadcast(StorageEvent* aEvent,
const char16_t* aStorageType,
bool aPrivateBrowsing,
bool aImmediateDispatch) {
MOZ_ASSERT(NS_IsMainThread());
RefPtr<StorageNotifierService> service = gStorageNotifierService;
if (!service) {
return;
}
RefPtr<StorageEvent> event = aEvent;
for (const auto& observer : service->mObservers.ForwardRange()) {
// Enforce that the source storage area's private browsing state matches
// this window's state. These flag checks and their maintenance independent
// from the principal's OriginAttributes matter because chrome docshells
// that are part of private browsing windows can be private browsing without
// having their OriginAttributes set (because they have the system
// principal).
if (aPrivateBrowsing != observer->IsPrivateBrowsing()) {
continue;
}
// No reasons to continue if the principal of the event doesn't match with
// the window's one.
if (!StorageUtils::PrincipalsEqual(
aEvent->GetPrincipal(), observer->GetEffectiveStoragePrincipal())) {
continue;
}
const auto pinnedObserver = observer;
RefPtr<Runnable> r = NS_NewRunnableFunction(
"StorageNotifierService::Broadcast",
[pinnedObserver, event, aStorageType, aPrivateBrowsing,
aImmediateDispatch]() {
// Check principals again. EffectiveStoragePrincipal may be changed
// when relaxed.
if (!aImmediateDispatch &&
!StorageUtils::PrincipalsEqual(
event->GetPrincipal(),
pinnedObserver->GetEffectiveStoragePrincipal())) {
return;
}
pinnedObserver->ObserveStorageNotification(event, aStorageType,
aPrivateBrowsing);
});
if (aImmediateDispatch) {
r->Run();
} else {
nsCOMPtr<nsIEventTarget> et = pinnedObserver->GetEventTarget();
if (et) {
et->Dispatch(r.forget());
}
}
}
}
void StorageNotifierService::Register(StorageNotificationObserver* aObserver) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aObserver);
MOZ_ASSERT(!mObservers.Contains(aObserver));
mObservers.AppendElement(aObserver);
}
void StorageNotifierService::Unregister(
StorageNotificationObserver* aObserver) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aObserver);
// No assertion about mObservers containing aObserver because window calls
// this method multiple times.
mObservers.RemoveElement(aObserver);
}
} // namespace mozilla::dom
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