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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/manifest/manifest_change_notifier.h"
#include <utility>
#include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/modules/manifest/manifest_manager.h"
namespace blink {
ManifestChangeNotifier::ManifestChangeNotifier(LocalDOMWindow& window)
: window_(window), manifest_change_observer_(&window) {}
ManifestChangeNotifier::~ManifestChangeNotifier() = default;
void ManifestChangeNotifier::Trace(Visitor* visitor) const {
visitor->Trace(window_);
visitor->Trace(manifest_change_observer_);
}
void ManifestChangeNotifier::DidChangeManifest() {
// Manifests are not considered when the current page has a unique origin.
if (!ManifestManager::From(*window_)->CanFetchManifest())
return;
if (report_task_scheduled_)
return;
// Changing the manifest URL can trigger multiple notifications; the manifest
// URL update may involve removing the old manifest link before adding the new
// one, triggering multiple calls to DidChangeManifest(). Coalesce changes
// during a single event loop task to avoid sending spurious notifications to
// the browser.
//
// During document load, coalescing is disabled to maintain relative ordering
// of this notification and the favicon URL reporting.
if (!window_->GetFrame()->IsLoading()) {
report_task_scheduled_ = true;
window_->GetTaskRunner(TaskType::kInternalLoading)
->PostTask(FROM_HERE,
WTF::BindOnce(&ManifestChangeNotifier::ReportManifestChange,
WrapWeakPersistent(this)));
return;
}
ReportManifestChange();
}
void ManifestChangeNotifier::ReportManifestChange() {
report_task_scheduled_ = false;
if (!window_ || !window_->GetFrame())
return;
auto manifest_url = ManifestManager::From(*window_)->ManifestURL();
EnsureManifestChangeObserver();
DCHECK(manifest_change_observer_.is_bound());
manifest_change_observer_->ManifestUrlChanged(manifest_url);
}
void ManifestChangeNotifier::EnsureManifestChangeObserver() {
if (manifest_change_observer_.is_bound())
return;
AssociatedInterfaceProvider* provider =
window_->GetFrame()->GetRemoteNavigationAssociatedInterfaces();
if (!provider)
return;
provider->GetInterface(
manifest_change_observer_.BindNewEndpointAndPassReceiver(
window_->GetTaskRunner(TaskType::kInternalLoading)));
}
} // namespace blink
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