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// Copyright 2025 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/clipboard/clipboard_change_event_controller.h"
#include <string_view>
#include "base/containers/fixed_flat_set.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/navigator.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/modules/clipboard/clipboard_change_event.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
#include "ui/base/clipboard/clipboard_constants.h"
namespace blink {
ClipboardChangeEventController::ClipboardChangeEventController(
Navigator& navigator,
EventTarget* event_target)
: Supplement<Navigator>(navigator),
PlatformEventController(*navigator.DomWindow()),
FocusChangedObserver(navigator.DomWindow()->GetFrame()->GetPage()),
event_target_(event_target) {}
void ClipboardChangeEventController::FocusedFrameChanged() {
ExecutionContext* context = GetExecutionContext();
if (!context) {
return;
}
LocalDOMWindow& window = *To<LocalDOMWindow>(context);
if (window.document()->hasFocus()) {
if (fire_clipboardchange_on_focus_) {
UseCounter::Count(GetExecutionContext(),
WebFeature::kClipboardChangeEventFiredAfterFocusGain);
OnClipboardChanged();
}
}
}
ExecutionContext* ClipboardChangeEventController::GetExecutionContext() const {
return GetSupplementable()->DomWindow();
}
void ClipboardChangeEventController::DidUpdateData() {
OnClipboardChanged();
}
bool ClipboardChangeEventController::HasLastData() {
return true;
}
void ClipboardChangeEventController::RegisterWithDispatcher() {
SystemClipboard* clipboard = GetSystemClipboard();
if (clipboard) {
clipboard->AddController(this, GetSupplementable()->DomWindow());
}
}
void ClipboardChangeEventController::UnregisterWithDispatcher() {
SystemClipboard* clipboard = GetSystemClipboard();
if (clipboard) {
clipboard->RemoveController(this);
}
}
SystemClipboard* ClipboardChangeEventController::GetSystemClipboard() const {
ExecutionContext* context = GetExecutionContext();
if (!context) {
return nullptr;
}
LocalFrame* local_frame = To<LocalDOMWindow>(context)->GetFrame();
return local_frame->GetSystemClipboard();
}
// Helper function to filter and only allow standard MIME types
Vector<String> FilterForStandardMimeTypes(const Vector<String>& types) {
// Static list of allowed standard MIME types
// https://w3c.github.io/clipboard-apis/#mandatory-data-types-x
constexpr auto kAllowedMimeTypesSet =
base::MakeFixedFlatSet<std::string_view>(
{ui::kMimeTypePlainText, ui::kMimeTypeHtml, ui::kMimeTypePng});
Vector<String> filtered_types;
for (const auto& type : types) {
if (kAllowedMimeTypesSet.contains(type.Utf8())) {
filtered_types.push_back(type);
}
}
return filtered_types;
}
void ClipboardChangeEventController::Trace(Visitor* visitor) const {
Supplement<Navigator>::Trace(visitor);
PlatformEventController::Trace(visitor);
FocusChangedObserver::Trace(visitor);
visitor->Trace(event_target_);
}
void ClipboardChangeEventController::OnClipboardChanged() {
ExecutionContext* context = GetExecutionContext();
if (!context) {
return;
}
LocalDOMWindow& window = *To<LocalDOMWindow>(context);
CHECK(window.IsSecureContext()); // [SecureContext] in IDL
if (window.document()->hasFocus()) {
fire_clipboardchange_on_focus_ = false;
if (event_target_) {
Vector<String> available_types =
GetSystemClipboard()->ReadAvailableTypes();
Vector<String> standard_types =
FilterForStandardMimeTypes(available_types);
event_target_->DispatchEvent(
*ClipboardChangeEvent::Create(standard_types));
UseCounter::Count(GetExecutionContext(),
WebFeature::kClipboardChangeEventFired);
}
} else {
// Schedule a clipboardchange event when the page regains focus
fire_clipboardchange_on_focus_ = true;
}
}
} // namespace blink
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