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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003-2017 Apple Inc. All rights reserved.
* Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
* Copyright (C) 2011 Google 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 "HTMLLinkElement.h"
#include "Attribute.h"
#include "CachedCSSStyleSheet.h"
#include "CachedResource.h"
#include "CachedResourceLoader.h"
#include "CachedResourceRequest.h"
#include "ContentSecurityPolicy.h"
#include "CrossOriginAccessControl.h"
#include "DOMTokenList.h"
#include "Document.h"
#include "Event.h"
#include "EventNames.h"
#include "EventSender.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "HTMLAnchorElement.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "Logging.h"
#include "MediaList.h"
#include "MediaQueryEvaluator.h"
#include "MediaQueryParser.h"
#include "MouseEvent.h"
#include "RenderStyle.h"
#include "RuntimeEnabledFeatures.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include "StyleInheritedData.h"
#include "StyleResolveForDocument.h"
#include "StyleScope.h"
#include "StyleSheetContents.h"
#include "SubresourceIntegrity.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/Ref.h>
#include <wtf/SetForScope.h>
#include <wtf/StdLibExtras.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLLinkElement);
using namespace HTMLNames;
static LinkEventSender& linkLoadEventSender()
{
static NeverDestroyed<LinkEventSender> sharedLoadEventSender(eventNames().loadEvent);
return sharedLoadEventSender;
}
static LinkEventSender& linkErrorEventSender()
{
static NeverDestroyed<LinkEventSender> sharedErrorEventSender(eventNames().errorEvent);
return sharedErrorEventSender;
}
inline HTMLLinkElement::HTMLLinkElement(const QualifiedName& tagName, Document& document, bool createdByParser)
: HTMLElement(tagName, document)
, m_linkLoader(*this)
, m_disabledState(Unset)
, m_loading(false)
, m_createdByParser(createdByParser)
, m_firedLoad(false)
, m_loadedResource(false)
, m_pendingSheetType(Unknown)
{
ASSERT(hasTagName(linkTag));
}
Ref<HTMLLinkElement> HTMLLinkElement::create(const QualifiedName& tagName, Document& document, bool createdByParser)
{
return adoptRef(*new HTMLLinkElement(tagName, document, createdByParser));
}
HTMLLinkElement::~HTMLLinkElement()
{
if (m_sheet)
m_sheet->clearOwnerNode();
if (m_cachedSheet)
m_cachedSheet->removeClient(*this);
if (m_styleScope)
m_styleScope->removeStyleSheetCandidateNode(*this);
linkLoadEventSender().cancelEvent(*this);
linkErrorEventSender().cancelEvent(*this);
}
void HTMLLinkElement::setDisabledState(bool disabled)
{
DisabledState oldDisabledState = m_disabledState;
m_disabledState = disabled ? Disabled : EnabledViaScript;
if (oldDisabledState == m_disabledState)
return;
ASSERT(isConnected() || !styleSheetIsLoading());
if (!isConnected())
return;
// If we change the disabled state while the sheet is still loading, then we have to
// perform three checks:
if (styleSheetIsLoading()) {
// Check #1: The sheet becomes disabled while loading.
if (m_disabledState == Disabled)
removePendingSheet();
// Check #2: An alternate sheet becomes enabled while it is still loading.
if (m_relAttribute.isAlternate && m_disabledState == EnabledViaScript)
addPendingSheet(ActiveSheet);
// Check #3: A main sheet becomes enabled while it was still loading and
// after it was disabled via script. It takes really terrible code to make this
// happen (a double toggle for no reason essentially). This happens on
// virtualplastic.net, which manages to do about 12 enable/disables on only 3
// sheets. :)
if (!m_relAttribute.isAlternate && m_disabledState == EnabledViaScript && oldDisabledState == Disabled)
addPendingSheet(ActiveSheet);
// If the sheet is already loading just bail.
return;
}
// Load the sheet, since it's never been loaded before.
if (!m_sheet && m_disabledState == EnabledViaScript)
process();
else {
ASSERT(m_styleScope);
m_styleScope->didChangeActiveStyleSheetCandidates();
}
}
void HTMLLinkElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
if (name == relAttr) {
m_relAttribute = LinkRelAttribute(document(), value);
if (m_relList)
m_relList->associatedAttributeValueChanged(value);
process();
return;
}
if (name == hrefAttr) {
bool wasLink = isLink();
setIsLink(!value.isNull() && !shouldProhibitLinks(this));
if (wasLink != isLink())
invalidateStyleForSubtree();
process();
return;
}
if (name == typeAttr) {
m_type = value;
process();
return;
}
if (name == sizesAttr) {
if (m_sizes)
m_sizes->associatedAttributeValueChanged(value);
process();
return;
}
if (name == mediaAttr) {
m_media = value.string().convertToASCIILowercase();
process();
if (m_sheet && !isDisabled())
m_styleScope->didChangeActiveStyleSheetCandidates();
return;
}
if (name == disabledAttr) {
setDisabledState(!value.isNull());
return;
}
if (name == titleAttr) {
if (m_sheet && !isInShadowTree())
m_sheet->setTitle(value);
return;
}
HTMLElement::parseAttribute(name, value);
}
bool HTMLLinkElement::shouldLoadLink()
{
Ref<Document> originalDocument = document();
if (!dispatchBeforeLoadEvent(getNonEmptyURLAttribute(hrefAttr)))
return false;
// A beforeload handler might have removed us from the document or changed the document.
if (!isConnected() || &document() != originalDocument.ptr())
return false;
return true;
}
void HTMLLinkElement::setCrossOrigin(const AtomString& value)
{
setAttributeWithoutSynchronization(crossoriginAttr, value);
}
String HTMLLinkElement::crossOrigin() const
{
return parseCORSSettingsAttribute(attributeWithoutSynchronization(crossoriginAttr));
}
void HTMLLinkElement::setAs(const AtomString& value)
{
setAttributeWithoutSynchronization(asAttr, value);
}
String HTMLLinkElement::as() const
{
String as = attributeWithoutSynchronization(asAttr);
if (equalLettersIgnoringASCIICase(as, "fetch")
|| equalLettersIgnoringASCIICase(as, "image")
|| equalLettersIgnoringASCIICase(as, "script")
|| equalLettersIgnoringASCIICase(as, "style")
|| (RuntimeEnabledFeatures::sharedFeatures().mediaPreloadingEnabled()
&& (equalLettersIgnoringASCIICase(as, "video")
|| equalLettersIgnoringASCIICase(as, "audio")))
#if ENABLE(VIDEO_TRACK)
|| equalLettersIgnoringASCIICase(as, "track")
#endif
|| equalLettersIgnoringASCIICase(as, "font"))
return as.convertToASCIILowercase();
return String();
}
void HTMLLinkElement::process()
{
if (!isConnected()) {
ASSERT(!m_sheet);
return;
}
// Prevent recursive loading of link.
if (m_isHandlingBeforeLoad)
return;
URL url = getNonEmptyURLAttribute(hrefAttr);
LinkLoadParameters params {
m_relAttribute,
url,
attributeWithoutSynchronization(asAttr),
attributeWithoutSynchronization(mediaAttr),
attributeWithoutSynchronization(typeAttr),
attributeWithoutSynchronization(crossoriginAttr),
attributeWithoutSynchronization(imagesrcsetAttr),
attributeWithoutSynchronization(imagesizesAttr)
};
m_linkLoader.loadLink(params, document());
bool treatAsStyleSheet = m_relAttribute.isStyleSheet
|| (document().settings().treatsAnyTextCSSLinkAsStylesheet() && m_type.containsIgnoringASCIICase("text/css"));
if (m_disabledState != Disabled && treatAsStyleSheet && document().frame() && url.isValid()) {
String charset = attributeWithoutSynchronization(charsetAttr);
if (charset.isEmpty())
charset = document().charset();
if (m_cachedSheet) {
removePendingSheet();
m_cachedSheet->removeClient(*this);
m_cachedSheet = nullptr;
}
{
SetForScope<bool> change(m_isHandlingBeforeLoad, true);
if (!shouldLoadLink())
return;
}
m_loading = true;
bool mediaQueryMatches = true;
if (!m_media.isEmpty()) {
Optional<RenderStyle> documentStyle;
if (document().hasLivingRenderTree())
documentStyle = Style::resolveForDocument(document());
auto media = MediaQuerySet::create(m_media, MediaQueryParserContext(document()));
LOG(MediaQueries, "HTMLLinkElement::process evaluating queries");
mediaQueryMatches = MediaQueryEvaluator { document().frame()->view()->mediaType(), document(), documentStyle ? &*documentStyle : nullptr }.evaluate(media.get());
}
// Don't hold up render tree construction and script execution on stylesheets
// that are not needed for the rendering at the moment.
bool isActive = mediaQueryMatches && !isAlternate();
addPendingSheet(isActive ? ActiveSheet : InactiveSheet);
// Load stylesheets that are not needed for the rendering immediately with low priority.
Optional<ResourceLoadPriority> priority;
if (!isActive)
priority = ResourceLoadPriority::VeryLow;
if (document().settings().subresourceIntegrityEnabled())
m_integrityMetadataForPendingSheetRequest = attributeWithoutSynchronization(HTMLNames::integrityAttr);
ResourceLoaderOptions options = CachedResourceLoader::defaultCachedResourceOptions();
options.sameOriginDataURLFlag = SameOriginDataURLFlag::Set;
if (document().contentSecurityPolicy()->allowStyleWithNonce(attributeWithoutSynchronization(HTMLNames::nonceAttr)))
options.contentSecurityPolicyImposition = ContentSecurityPolicyImposition::SkipPolicyCheck;
options.integrity = m_integrityMetadataForPendingSheetRequest;
auto request = createPotentialAccessControlRequest(WTFMove(url), document(), crossOrigin(), WTFMove(options));
request.setPriority(WTFMove(priority));
request.setCharset(WTFMove(charset));
request.setInitiator(*this);
ASSERT_WITH_SECURITY_IMPLICATION(!m_cachedSheet);
m_cachedSheet = document().cachedResourceLoader().requestCSSStyleSheet(WTFMove(request)).value_or(nullptr);
if (m_cachedSheet)
m_cachedSheet->addClient(*this);
else {
// The request may have been denied if (for example) the stylesheet is local and the document is remote.
m_loading = false;
sheetLoaded();
notifyLoadedSheetAndAllCriticalSubresources(false);
}
} else if (m_sheet) {
// we no longer contain a stylesheet, e.g. perhaps rel or type was changed
clearSheet();
m_styleScope->didChangeActiveStyleSheetCandidates();
}
}
void HTMLLinkElement::clearSheet()
{
ASSERT(m_sheet);
ASSERT(m_sheet->ownerNode() == this);
m_sheet->clearOwnerNode();
m_sheet = nullptr;
}
Node::InsertedIntoAncestorResult HTMLLinkElement::insertedIntoAncestor(InsertionType insertionType, ContainerNode& parentOfInsertedTree)
{
HTMLElement::insertedIntoAncestor(insertionType, parentOfInsertedTree);
if (!insertionType.connectedToDocument)
return InsertedIntoAncestorResult::Done;
m_styleScope = &Style::Scope::forNode(*this);
m_styleScope->addStyleSheetCandidateNode(*this, m_createdByParser);
return InsertedIntoAncestorResult::NeedsPostInsertionCallback;
}
void HTMLLinkElement::didFinishInsertingNode()
{
process();
}
void HTMLLinkElement::removedFromAncestor(RemovalType removalType, ContainerNode& oldParentOfRemovedTree)
{
HTMLElement::removedFromAncestor(removalType, oldParentOfRemovedTree);
if (!removalType.disconnectedFromDocument)
return;
m_linkLoader.cancelLoad();
bool wasLoading = styleSheetIsLoading();
if (m_sheet)
clearSheet();
if (wasLoading)
removePendingSheet();
if (m_styleScope) {
m_styleScope->removeStyleSheetCandidateNode(*this);
m_styleScope = nullptr;
}
}
void HTMLLinkElement::finishParsingChildren()
{
m_createdByParser = false;
HTMLElement::finishParsingChildren();
}
void HTMLLinkElement::initializeStyleSheet(Ref<StyleSheetContents>&& styleSheet, const CachedCSSStyleSheet& cachedStyleSheet, MediaQueryParserContext context)
{
// FIXME: originClean should be turned to false except if fetch mode is CORS.
Optional<bool> originClean;
if (cachedStyleSheet.options().mode == FetchOptions::Mode::Cors)
originClean = cachedStyleSheet.isCORSSameOrigin();
m_sheet = CSSStyleSheet::create(WTFMove(styleSheet), *this, originClean);
m_sheet->setMediaQueries(MediaQuerySet::create(m_media, context));
if (!isInShadowTree())
m_sheet->setTitle(title());
if (!m_sheet->canAccessRules())
m_sheet->contents().setAsOpaque();
}
void HTMLLinkElement::setCSSStyleSheet(const String& href, const URL& baseURL, const String& charset, const CachedCSSStyleSheet* cachedStyleSheet)
{
if (!isConnected()) {
ASSERT(!m_sheet);
return;
}
auto frame = makeRefPtr(document().frame());
if (!frame)
return;
// Completing the sheet load may cause scripts to execute.
Ref<HTMLLinkElement> protectedThis(*this);
if (!cachedStyleSheet->errorOccurred() && !matchIntegrityMetadata(*cachedStyleSheet, m_integrityMetadataForPendingSheetRequest)) {
document().addConsoleMessage(MessageSource::Security, MessageLevel::Error, makeString("Cannot load stylesheet ", cachedStyleSheet->url().stringCenterEllipsizedToLength(), ". Failed integrity metadata check."));
m_loading = false;
sheetLoaded();
notifyLoadedSheetAndAllCriticalSubresources(true);
return;
}
CSSParserContext parserContext(document(), baseURL, charset);
auto cachePolicy = frame->loader().subresourceCachePolicy(baseURL);
if (auto restoredSheet = const_cast<CachedCSSStyleSheet*>(cachedStyleSheet)->restoreParsedStyleSheet(parserContext, cachePolicy, frame->loader())) {
ASSERT(restoredSheet->isCacheable());
ASSERT(!restoredSheet->isLoading());
initializeStyleSheet(restoredSheet.releaseNonNull(), *cachedStyleSheet, MediaQueryParserContext(document()));
m_loading = false;
sheetLoaded();
notifyLoadedSheetAndAllCriticalSubresources(false);
return;
}
auto styleSheet = StyleSheetContents::create(href, parserContext);
initializeStyleSheet(styleSheet.copyRef(), *cachedStyleSheet, MediaQueryParserContext(document()));
// FIXME: Set the visibility option based on m_sheet being clean or not.
// Best approach might be to set it on the style sheet content itself or its context parser otherwise.
styleSheet.get().parseAuthorStyleSheet(cachedStyleSheet, &document().securityOrigin());
m_loading = false;
styleSheet.get().notifyLoadedSheet(cachedStyleSheet);
styleSheet.get().checkLoaded();
if (styleSheet.get().isCacheable())
const_cast<CachedCSSStyleSheet*>(cachedStyleSheet)->saveParsedStyleSheet(WTFMove(styleSheet));
}
bool HTMLLinkElement::styleSheetIsLoading() const
{
if (m_loading)
return true;
if (!m_sheet)
return false;
return m_sheet->contents().isLoading();
}
DOMTokenList& HTMLLinkElement::sizes()
{
if (!m_sizes)
m_sizes = makeUnique<DOMTokenList>(*this, sizesAttr);
return *m_sizes;
}
void HTMLLinkElement::linkLoaded()
{
m_loadedResource = true;
if (!m_relAttribute.isLinkPrefetch || m_allowPrefetchLoadAndErrorForTesting)
linkLoadEventSender().dispatchEventSoon(*this);
}
void HTMLLinkElement::linkLoadingErrored()
{
if (!m_relAttribute.isLinkPrefetch || m_allowPrefetchLoadAndErrorForTesting)
linkErrorEventSender().dispatchEventSoon(*this);
}
bool HTMLLinkElement::sheetLoaded()
{
if (!styleSheetIsLoading()) {
removePendingSheet();
return true;
}
return false;
}
void HTMLLinkElement::dispatchPendingLoadEvents()
{
linkLoadEventSender().dispatchPendingEvents();
}
void HTMLLinkElement::dispatchPendingEvent(LinkEventSender* eventSender)
{
ASSERT_UNUSED(eventSender, eventSender == &linkLoadEventSender() || eventSender == &linkErrorEventSender());
if (m_loadedResource)
dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
else
dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
}
DOMTokenList& HTMLLinkElement::relList()
{
if (!m_relList)
m_relList = makeUnique<DOMTokenList>(*this, HTMLNames::relAttr, [](Document& document, StringView token) {
return LinkRelAttribute::isSupported(document, token);
});
return *m_relList;
}
void HTMLLinkElement::notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred)
{
if (m_firedLoad)
return;
m_loadedResource = !errorOccurred;
linkLoadEventSender().dispatchEventSoon(*this);
m_firedLoad = true;
}
void HTMLLinkElement::startLoadingDynamicSheet()
{
// We don't support multiple active sheets.
ASSERT(m_pendingSheetType < ActiveSheet);
addPendingSheet(ActiveSheet);
}
bool HTMLLinkElement::isURLAttribute(const Attribute& attribute) const
{
return attribute.name().localName() == hrefAttr || HTMLElement::isURLAttribute(attribute);
}
void HTMLLinkElement::defaultEventHandler(Event& event)
{
if (MouseEvent::canTriggerActivationBehavior(event)) {
handleClick(event);
return;
}
HTMLElement::defaultEventHandler(event);
}
void HTMLLinkElement::handleClick(Event& event)
{
event.setDefaultHandled();
URL url = href();
if (url.isNull())
return;
RefPtr<Frame> frame = document().frame();
if (!frame)
return;
frame->loader().urlSelected(url, target(), &event, LockHistory::No, LockBackForwardList::No, MaybeSendReferrer, document().shouldOpenExternalURLsPolicyToPropagate());
}
URL HTMLLinkElement::href() const
{
return document().completeURL(attributeWithoutSynchronization(hrefAttr));
}
const AtomString& HTMLLinkElement::rel() const
{
return attributeWithoutSynchronization(relAttr);
}
String HTMLLinkElement::target() const
{
return attributeWithoutSynchronization(targetAttr);
}
const AtomString& HTMLLinkElement::type() const
{
return attributeWithoutSynchronization(typeAttr);
}
Optional<LinkIconType> HTMLLinkElement::iconType() const
{
return m_relAttribute.iconType;
}
void HTMLLinkElement::addSubresourceAttributeURLs(ListHashSet<URL>& urls) const
{
HTMLElement::addSubresourceAttributeURLs(urls);
// Favicons are handled by a special case in LegacyWebArchive::create()
if (m_relAttribute.iconType)
return;
if (!m_relAttribute.isStyleSheet)
return;
// Append the URL of this link element.
addSubresourceURL(urls, href());
if (auto styleSheet = makeRefPtr(this->sheet())) {
styleSheet->contents().traverseSubresources([&] (auto& resource) {
urls.add(resource.url());
return false;
});
}
}
void HTMLLinkElement::addPendingSheet(PendingSheetType type)
{
if (type <= m_pendingSheetType)
return;
m_pendingSheetType = type;
if (m_pendingSheetType == InactiveSheet)
return;
ASSERT(m_styleScope);
m_styleScope->addPendingSheet(*this);
}
void HTMLLinkElement::removePendingSheet()
{
PendingSheetType type = m_pendingSheetType;
m_pendingSheetType = Unknown;
if (type == Unknown)
return;
ASSERT(m_styleScope);
if (type == InactiveSheet) {
// Document just needs to know about the sheet for exposure through document.styleSheets
m_styleScope->didChangeActiveStyleSheetCandidates();
return;
}
m_styleScope->removePendingSheet(*this);
}
} // namespace WebCore