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-rw-r--r--dom/permission/PermissionObserver.cpp131
1 files changed, 131 insertions, 0 deletions
diff --git a/dom/permission/PermissionObserver.cpp b/dom/permission/PermissionObserver.cpp
new file mode 100644
index 000000000..beda385e7
--- /dev/null
+++ b/dom/permission/PermissionObserver.cpp
@@ -0,0 +1,131 @@
+/* -*- 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 {
+namespace 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.get());
+ if (permission) {
+ Notify(permission.value(), *principal);
+ }
+
+ return NS_OK;
+}
+
+} // namespace dom
+} // namespace mozilla