blob: c7f15f5176593c4da0029f0abd52d6b7dab96b3a [file] [log] [blame]
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Stefan Schimanski (1Stein@gmx.de)
* Copyright (C) 2004-2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "HTMLPlugInElement.h"
#include "BridgeJSC.h"
#include "CSSPropertyNames.h"
#include "Document.h"
#include "Event.h"
#include "EventHandler.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameTree.h"
#include "HTMLNames.h"
#include "HitTestResult.h"
#include "Logging.h"
#include "MIMETypeRegistry.h"
#include "Page.h"
#include "PluginData.h"
#include "PluginViewBase.h"
#include "RenderEmbeddedObject.h"
#include "RenderLayer.h"
#include "RenderView.h"
#include "RenderWidget.h"
#include "ScriptController.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "SubframeLoader.h"
#include "Widget.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLPlugInElement);
using namespace HTMLNames;
HTMLPlugInElement::HTMLPlugInElement(const QualifiedName& tagName, Document& document)
: HTMLFrameOwnerElement(tagName, document)
, m_swapRendererTimer(*this, &HTMLPlugInElement::swapRendererTimerFired)
{
setHasCustomStyleResolveCallbacks();
}
HTMLPlugInElement::~HTMLPlugInElement()
{
ASSERT(!m_instance); // cleared in detach()
}
bool HTMLPlugInElement::willRespondToMouseClickEvents()
{
if (isDisabledFormControl())
return false;
auto renderer = this->renderer();
return renderer && renderer->isWidget();
}
void HTMLPlugInElement::willDetachRenderers()
{
m_instance = nullptr;
if (m_isCapturingMouseEvents) {
if (RefPtr<Frame> frame = document().frame())
frame->eventHandler().setCapturingMouseEventsElement(nullptr);
m_isCapturingMouseEvents = false;
}
}
void HTMLPlugInElement::resetInstance()
{
m_instance = nullptr;
}
JSC::Bindings::Instance* HTMLPlugInElement::bindingsInstance()
{
RefPtr frame = document().frame();
if (!frame)
return nullptr;
// If the host dynamically turns off JavaScript (or Java) we will still return
// the cached allocated Bindings::Instance. Not supporting this edge-case is OK.
if (!m_instance) {
if (RefPtr widget = pluginWidget())
m_instance = frame->script().createScriptInstanceForWidget(widget.get());
}
return m_instance.get();
}
bool HTMLPlugInElement::guardedDispatchBeforeLoadEvent(const String& sourceURL)
{
// FIXME: Our current plug-in loading design can't guarantee the following
// assertion is true, since plug-in loading can be initiated during layout,
// and synchronous layout can be initiated in a beforeload event handler!
// See <http://webkit.org/b/71264>.
// ASSERT(!m_inBeforeLoadEventHandler);
m_inBeforeLoadEventHandler = true;
// static_cast is used to avoid a compile error since dispatchBeforeLoadEvent
// is intentionally undefined on this class.
bool beforeLoadAllowedLoad = static_cast<HTMLFrameOwnerElement*>(this)->dispatchBeforeLoadEvent(sourceURL);
m_inBeforeLoadEventHandler = false;
return beforeLoadAllowedLoad;
}
Widget* HTMLPlugInElement::pluginWidget(PluginLoadingPolicy loadPolicy) const
{
if (m_inBeforeLoadEventHandler) {
// The plug-in hasn't loaded yet, and it makes no sense to try to load if beforeload handler happened to touch the plug-in element.
// That would recursively call beforeload for the same element.
return nullptr;
}
RenderWidget* renderWidget = loadPolicy == PluginLoadingPolicy::Load ? renderWidgetLoadingPlugin() : this->renderWidget();
if (!renderWidget)
return nullptr;
return renderWidget->widget();
}
RenderWidget* HTMLPlugInElement::renderWidgetLoadingPlugin() const
{
RefPtr<FrameView> view = document().view();
if (!view || (!view->inUpdateEmbeddedObjects() && !view->layoutContext().isInLayout() && !view->isPainting())) {
// Needs to load the plugin immediatedly because this function is called
// when JavaScript code accesses the plugin.
// FIXME: <rdar://16893708> Check if dispatching events here is safe.
document().updateLayoutIgnorePendingStylesheets(Document::RunPostLayoutTasks::Synchronously);
}
return renderWidget(); // This will return nullptr if the renderer is not a RenderWidget.
}
bool HTMLPlugInElement::hasPresentationalHintsForAttribute(const QualifiedName& name) const
{
if (name == widthAttr || name == heightAttr || name == vspaceAttr || name == hspaceAttr || name == alignAttr)
return true;
return HTMLFrameOwnerElement::hasPresentationalHintsForAttribute(name);
}
void HTMLPlugInElement::collectPresentationalHintsForAttribute(const QualifiedName& name, const AtomString& value, MutableStyleProperties& style)
{
if (name == widthAttr)
addHTMLLengthToStyle(style, CSSPropertyWidth, value);
else if (name == heightAttr)
addHTMLLengthToStyle(style, CSSPropertyHeight, value);
else if (name == vspaceAttr) {
addHTMLLengthToStyle(style, CSSPropertyMarginTop, value);
addHTMLLengthToStyle(style, CSSPropertyMarginBottom, value);
} else if (name == hspaceAttr) {
addHTMLLengthToStyle(style, CSSPropertyMarginLeft, value);
addHTMLLengthToStyle(style, CSSPropertyMarginRight, value);
} else if (name == alignAttr)
applyAlignmentAttributeToStyle(value, style);
else
HTMLFrameOwnerElement::collectPresentationalHintsForAttribute(name, value, style);
}
void HTMLPlugInElement::defaultEventHandler(Event& event)
{
// Firefox seems to use a fake event listener to dispatch events to plug-in (tested with mouse events only).
// This is observable via different order of events - in Firefox, event listeners specified in HTML attributes fires first, then an event
// gets dispatched to plug-in, and only then other event listeners fire. Hopefully, this difference does not matter in practice.
// FIXME: Mouse down and scroll events are passed down to plug-in via custom code in EventHandler; these code paths should be united.
auto renderer = this->renderer();
if (!is<RenderWidget>(renderer))
return;
if (is<RenderEmbeddedObject>(*renderer) && downcast<RenderEmbeddedObject>(*renderer).isPluginUnavailable())
downcast<RenderEmbeddedObject>(*renderer).handleUnavailablePluginIndicatorEvent(&event);
// Don't keep the widget alive over the defaultEventHandler call, since that can do things like navigate.
{
RefPtr<Widget> widget = downcast<RenderWidget>(*renderer).widget();
if (!widget)
return;
widget->handleEvent(event);
if (event.defaultHandled())
return;
}
HTMLFrameOwnerElement::defaultEventHandler(event);
}
bool HTMLPlugInElement::isKeyboardFocusable(KeyboardEvent*) const
{
// FIXME: Why is this check needed?
if (!document().page())
return false;
RefPtr<Widget> widget = pluginWidget();
if (!is<PluginViewBase>(widget))
return false;
return downcast<PluginViewBase>(*widget).supportsKeyboardFocus();
}
bool HTMLPlugInElement::isPluginElement() const
{
return true;
}
bool HTMLPlugInElement::isUserObservable() const
{
// No widget - can't be anything to see or hear here.
RefPtr<Widget> widget = pluginWidget(PluginLoadingPolicy::DoNotLoad);
if (!is<PluginViewBase>(widget))
return false;
PluginViewBase& pluginView = downcast<PluginViewBase>(*widget);
// If audio is playing (or might be) then the plugin is detectable.
if (pluginView.audioHardwareActivity() != AudioHardwareActivityType::IsInactive)
return true;
// If the plugin is visible and not vanishingly small in either dimension it is detectable.
return pluginView.isVisible() && pluginView.width() > 2 && pluginView.height() > 2;
}
bool HTMLPlugInElement::supportsFocus() const
{
if (HTMLFrameOwnerElement::supportsFocus())
return true;
if (useFallbackContent() || !is<RenderEmbeddedObject>(renderer()))
return false;
return !downcast<RenderEmbeddedObject>(*renderer()).isPluginUnavailable();
}
RenderPtr<RenderElement> HTMLPlugInElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
return createRenderer<RenderEmbeddedObject>(*this, WTFMove(style));
}
void HTMLPlugInElement::swapRendererTimerFired()
{
ASSERT(displayState() == PreparingPluginReplacement);
if (userAgentShadowRoot())
return;
// Create a shadow root, which will trigger the code to add a snapshot container
// and reattach, thus making a new Renderer.
Ref<HTMLPlugInElement> protectedThis(*this);
ensureUserAgentShadowRoot();
}
void HTMLPlugInElement::setDisplayState(DisplayState state)
{
if (state == m_displayState)
return;
m_displayState = state;
m_swapRendererTimer.stop();
if (displayState() == PreparingPluginReplacement)
m_swapRendererTimer.startOneShot(0_s);
}
void HTMLPlugInElement::didAddUserAgentShadowRoot(ShadowRoot&)
{
}
bool HTMLPlugInElement::requestObject(const String&, const String&, const Vector<String>&, const Vector<String>&)
{
return false;
}
bool HTMLPlugInElement::isBelowSizeThreshold() const
{
auto* renderObject = renderer();
if (!is<RenderEmbeddedObject>(renderObject))
return true;
auto& renderEmbeddedObject = downcast<RenderEmbeddedObject>(*renderObject);
return renderEmbeddedObject.isPluginUnavailable() && renderEmbeddedObject.pluginUnavailabilityReason() == RenderEmbeddedObject::PluginTooSmall;
}
bool HTMLPlugInElement::setReplacement(RenderEmbeddedObject::PluginUnavailabilityReason reason, const String& unavailabilityDescription)
{
if (!is<RenderEmbeddedObject>(renderer()))
return false;
if (reason == RenderEmbeddedObject::UnsupportedPlugin)
document().addConsoleMessage(MessageSource::JS, MessageLevel::Warning, "Tried to use an unsupported plug-in."_s);
Ref<HTMLPlugInElement> protectedThis(*this);
downcast<RenderEmbeddedObject>(*renderer()).setPluginUnavailabilityReasonWithDescription(reason, unavailabilityDescription);
bool replacementIsObscured = isReplacementObscured();
// hittest in isReplacementObscured() method could destroy the renderer. Let's refetch it.
if (is<RenderEmbeddedObject>(renderer()))
downcast<RenderEmbeddedObject>(*renderer()).setUnavailablePluginIndicatorIsHidden(replacementIsObscured);
return replacementIsObscured;
}
bool HTMLPlugInElement::isReplacementObscured()
{
Ref topDocument = document().topDocument();
RefPtr topFrameView = topDocument->view();
if (!topFrameView)
return false;
topFrameView->updateLayoutAndStyleIfNeededRecursive();
// Updating the layout may have detached this document from the top document.
auto* renderView = topDocument->renderView();
if (!renderView || !document().view() || &document().topDocument() != topDocument.ptr())
return false;
if (!renderer() || !is<RenderEmbeddedObject>(*renderer()))
return false;
auto& pluginRenderer = downcast<RenderEmbeddedObject>(*renderer());
// Check the opacity of each layer containing the element or its ancestors.
float opacity = 1.0;
for (auto* layer = pluginRenderer.enclosingLayer(); layer; layer = layer->parent()) {
opacity *= layer->renderer().style().opacity();
if (opacity < 0.1)
return true;
}
// Calculate the absolute rect for the blocked plugin replacement text.
LayoutPoint absoluteLocation(pluginRenderer.absoluteBoundingBoxRect().location());
LayoutRect rect = pluginRenderer.unavailablePluginIndicatorBounds(absoluteLocation);
if (rect.isEmpty())
return true;
auto viewRect = document().view()->convertToRootView(snappedIntRect(rect));
auto x = viewRect.x();
auto y = viewRect.y();
auto width = viewRect.width();
auto height = viewRect.height();
// Hit test the center and near the corners of the replacement text to ensure
// it is visible and is not masked by other elements.
constexpr OptionSet<HitTestRequest::Type> hitType { HitTestRequest::Type::ReadOnly, HitTestRequest::Type::Active, HitTestRequest::Type::IgnoreClipping, HitTestRequest::Type::DisallowUserAgentShadowContent, HitTestRequest::Type::AllowChildFrameContent };
HitTestResult result;
HitTestLocation location { LayoutPoint { viewRect.center() } };
ASSERT(!renderView->needsLayout());
ASSERT(!renderView->document().needsStyleRecalc());
bool hit = topDocument->hitTest(hitType, location, result);
if (!hit || result.innerNode() != &pluginRenderer.frameOwnerElement())
return true;
location = LayoutPoint(x, y);
hit = topDocument->hitTest(hitType, location, result);
if (!hit || result.innerNode() != &pluginRenderer.frameOwnerElement())
return true;
location = LayoutPoint(x + width, y);
hit = topDocument->hitTest(hitType, location, result);
if (!hit || result.innerNode() != &pluginRenderer.frameOwnerElement())
return true;
location = LayoutPoint(x + width, y + height);
hit = topDocument->hitTest(hitType, location, result);
if (!hit || result.innerNode() != &pluginRenderer.frameOwnerElement())
return true;
location = LayoutPoint(x, y + height);
hit = topDocument->hitTest(hitType, location, result);
if (!hit || result.innerNode() != &pluginRenderer.frameOwnerElement())
return true;
return false;
}
bool HTMLPlugInElement::canLoadScriptURL(const URL&) const
{
// FIXME: Probably want to at least check canAddSubframe.
return true;
}
}