131 lines
2.8 KiB
C++
131 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "PermissionObserver.h"
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#include "mozilla/dom/PermissionStatus.h"
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#include "mozilla/Services.h"
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#include "mozilla/UniquePtr.h"
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#include "nsIObserverService.h"
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#include "nsIPermission.h"
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#include "PermissionUtils.h"
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namespace mozilla {
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namespace dom {
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namespace {
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PermissionObserver* gInstance = nullptr;
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} // namespace
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NS_IMPL_ISUPPORTS(PermissionObserver,
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nsIObserver,
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nsISupportsWeakReference)
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PermissionObserver::PermissionObserver()
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{
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MOZ_ASSERT(!gInstance);
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}
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PermissionObserver::~PermissionObserver()
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{
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MOZ_ASSERT(mSinks.IsEmpty());
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MOZ_ASSERT(gInstance == this);
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gInstance = nullptr;
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}
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/* static */ already_AddRefed<PermissionObserver>
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PermissionObserver::GetInstance()
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{
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RefPtr<PermissionObserver> instance = gInstance;
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if (!instance) {
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instance = new PermissionObserver();
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nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
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if (NS_WARN_IF(!obs)) {
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return nullptr;
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}
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nsresult rv = obs->AddObserver(instance, "perm-changed", true);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return nullptr;
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}
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gInstance = instance;
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}
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return instance.forget();
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}
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void
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PermissionObserver::AddSink(PermissionStatus* aSink)
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{
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MOZ_ASSERT(aSink);
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MOZ_ASSERT(!mSinks.Contains(aSink));
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mSinks.AppendElement(aSink);
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}
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void
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PermissionObserver::RemoveSink(PermissionStatus* aSink)
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{
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MOZ_ASSERT(aSink);
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MOZ_ASSERT(mSinks.Contains(aSink));
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mSinks.RemoveElement(aSink);
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}
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void
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PermissionObserver::Notify(PermissionName aName, nsIPrincipal& aPrincipal)
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{
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for (auto* sink : mSinks) {
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if (sink->mName != aName) {
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continue;
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}
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nsCOMPtr<nsIPrincipal> sinkPrincipal = sink->GetPrincipal();
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if (NS_WARN_IF(!sinkPrincipal) || !aPrincipal.Equals(sinkPrincipal)) {
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continue;
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}
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sink->PermissionChanged();
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}
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}
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NS_IMETHODIMP
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PermissionObserver::Observe(nsISupports* aSubject,
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const char* aTopic,
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const char16_t* aData)
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{
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MOZ_ASSERT(!strcmp(aTopic, "perm-changed"));
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if (mSinks.IsEmpty()) {
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return NS_OK;
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}
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nsCOMPtr<nsIPermission> perm = do_QueryInterface(aSubject);
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if (!perm) {
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return NS_OK;
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}
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nsCOMPtr<nsIPrincipal> principal;
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perm->GetPrincipal(getter_AddRefs(principal));
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if (!principal) {
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return NS_OK;
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}
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nsAutoCString type;
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perm->GetType(type);
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Maybe<PermissionName> permission = TypeToPermissionName(type.get());
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if (permission) {
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Notify(permission.value(), *principal);
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}
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return NS_OK;
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}
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} // namespace dom
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} // namespace mozilla
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