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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 "PermissionObserver.h"
#include "mozilla/dom/PermissionStatus.h"
#include "mozilla/Services.h"
#include "mozilla/UniquePtr.h"
#include "nsIObserverService.h"
#include "nsIPermission.h"
#include "PermissionUtils.h"
namespace mozilla::dom {
namespace {
PermissionObserver* gInstance = nullptr;
} // namespace
NS_IMPL_ISUPPORTS(PermissionObserver, nsIObserver, nsISupportsWeakReference)
PermissionObserver::PermissionObserver() { MOZ_ASSERT(!gInstance); }
PermissionObserver::~PermissionObserver() {
MOZ_ASSERT(mSinks.IsEmpty());
MOZ_ASSERT(gInstance == this);
gInstance = nullptr;
}
/* static */
already_AddRefed<PermissionObserver> PermissionObserver::GetInstance() {
RefPtr<PermissionObserver> instance = gInstance;
if (!instance) {
instance = new PermissionObserver();
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (NS_WARN_IF(!obs)) {
return nullptr;
}
nsresult rv = obs->AddObserver(instance, "perm-changed", true);
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
gInstance = instance;
}
return instance.forget();
}
void PermissionObserver::AddSink(PermissionStatus* aSink) {
MOZ_ASSERT(aSink);
MOZ_ASSERT(!mSinks.Contains(aSink));
mSinks.AppendElement(aSink);
}
void PermissionObserver::RemoveSink(PermissionStatus* aSink) {
MOZ_ASSERT(aSink);
MOZ_ASSERT(mSinks.Contains(aSink));
mSinks.RemoveElement(aSink);
}
void PermissionObserver::Notify(PermissionName aName,
nsIPrincipal& aPrincipal) {
for (auto* sink : mSinks) {
if (sink->mName != aName) {
continue;
}
nsCOMPtr<nsIPrincipal> sinkPrincipal = sink->GetPrincipal();
if (NS_WARN_IF(!sinkPrincipal) || !aPrincipal.Equals(sinkPrincipal)) {
continue;
}
sink->PermissionChanged();
}
}
NS_IMETHODIMP
PermissionObserver::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
MOZ_ASSERT(!strcmp(aTopic, "perm-changed"));
if (mSinks.IsEmpty()) {
return NS_OK;
}
nsCOMPtr<nsIPermission> perm = do_QueryInterface(aSubject);
if (!perm) {
return NS_OK;
}
nsCOMPtr<nsIPrincipal> principal;
perm->GetPrincipal(getter_AddRefs(principal));
if (!principal) {
return NS_OK;
}
nsAutoCString type;
perm->GetType(type);
Maybe<PermissionName> permission = TypeToPermissionName(type);
if (permission) {
Notify(permission.value(), *principal);
}
return NS_OK;
}
} // namespace mozilla::dom
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