| /* |
| * 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, 2006, 2007, 2008, 2009, 2010 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 "core/html/HTMLLinkElement.h" |
| |
| #include "bindings/core/v8/ScriptEventListener.h" |
| #include "core/HTMLNames.h" |
| #include "core/css/MediaList.h" |
| #include "core/css/MediaQueryEvaluator.h" |
| #include "core/css/StyleSheetContents.h" |
| #include "core/css/resolver/StyleResolver.h" |
| #include "core/dom/Attribute.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/StyleEngine.h" |
| #include "core/events/Event.h" |
| #include "core/events/EventSender.h" |
| #include "core/fetch/CSSStyleSheetResource.h" |
| #include "core/fetch/FetchRequest.h" |
| #include "core/fetch/ResourceFetcher.h" |
| #include "core/frame/FrameView.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/frame/SubresourceIntegrity.h" |
| #include "core/frame/UseCounter.h" |
| #include "core/frame/csp/ContentSecurityPolicy.h" |
| #include "core/html/CrossOriginAttribute.h" |
| #include "core/html/LinkManifest.h" |
| #include "core/html/imports/LinkImport.h" |
| #include "core/inspector/ConsoleMessage.h" |
| #include "core/loader/FrameLoader.h" |
| #include "core/loader/FrameLoaderClient.h" |
| #include "core/loader/NetworkHintsInterface.h" |
| #include "core/style/StyleInheritedData.h" |
| #include "platform/ContentType.h" |
| #include "platform/Histogram.h" |
| #include "platform/MIMETypeRegistry.h" |
| #include "platform/RuntimeEnabledFeatures.h" |
| #include "public/platform/WebIconSizesParser.h" |
| #include "public/platform/WebSize.h" |
| #include "wtf/StdLibExtras.h" |
| |
| namespace blink { |
| |
| using namespace HTMLNames; |
| |
| static LinkEventSender& linkLoadEventSender() |
| { |
| DEFINE_STATIC_LOCAL(LinkEventSender, sharedLoadEventSender, (LinkEventSender::create(EventTypeNames::load))); |
| return sharedLoadEventSender; |
| } |
| |
| static bool styleSheetTypeIsSupported(const String& type) |
| { |
| String trimmedType = ContentType(type).type(); |
| return trimmedType.isEmpty() || MIMETypeRegistry::isSupportedStyleSheetMIMEType(trimmedType); |
| } |
| |
| inline HTMLLinkElement::HTMLLinkElement(Document& document, bool createdByParser) |
| : HTMLElement(linkTag, document) |
| , m_linkLoader(LinkLoader::create(this)) |
| , m_sizes(DOMTokenList::create(this)) |
| , m_relList(RelList::create(this)) |
| , m_createdByParser(createdByParser) |
| { |
| } |
| |
| HTMLLinkElement* HTMLLinkElement::create(Document& document, bool createdByParser) |
| { |
| return new HTMLLinkElement(document, createdByParser); |
| } |
| |
| HTMLLinkElement::~HTMLLinkElement() |
| { |
| } |
| |
| void HTMLLinkElement::parseAttribute(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& value) |
| { |
| if (name == relAttr) { |
| m_relAttribute = LinkRelAttribute(value); |
| m_relList->setRelValues(value); |
| process(); |
| } else if (name == hrefAttr) { |
| // Log href attribute before logging resource fetching in process(). |
| logUpdateAttributeIfIsolatedWorldAndInDocument("link", hrefAttr, oldValue, value); |
| process(); |
| } else if (name == typeAttr) { |
| m_type = value; |
| process(); |
| } else if (name == asAttr) { |
| m_as = value; |
| process(); |
| } else if (name == sizesAttr) { |
| m_sizes->setValue(value); |
| } else if (name == mediaAttr) { |
| m_media = value.lower(); |
| process(); |
| } else if (name == scopeAttr) { |
| m_scope = value; |
| process(); |
| } else if (name == disabledAttr) { |
| UseCounter::count(document(), UseCounter::HTMLLinkElementDisabled); |
| if (LinkStyle* link = linkStyle()) |
| link->setDisabledState(!value.isNull()); |
| } else { |
| if (name == titleAttr) { |
| if (LinkStyle* link = linkStyle()) |
| link->setSheetTitle(value); |
| } |
| |
| HTMLElement::parseAttribute(name, oldValue, value); |
| } |
| } |
| |
| bool HTMLLinkElement::shouldLoadLink() |
| { |
| return isConnected(); |
| } |
| |
| bool HTMLLinkElement::loadLink(const String& type, const String& as, const String& media, const KURL& url) |
| { |
| return m_linkLoader->loadLink(m_relAttribute, crossOriginAttributeValue(fastGetAttribute(HTMLNames::crossoriginAttr)), type, as, media, url, document(), NetworkHintsInterfaceImpl()); |
| } |
| |
| LinkResource* HTMLLinkElement::linkResourceToProcess() |
| { |
| bool visible = isConnected() && !isInShadowTree(); |
| if (!visible) { |
| ASSERT(!linkStyle() || !linkStyle()->hasSheet()); |
| return nullptr; |
| } |
| |
| if (!m_link) { |
| if (m_relAttribute.isImport()) { |
| m_link = LinkImport::create(this); |
| } else if (m_relAttribute.isManifest()) { |
| m_link = LinkManifest::create(this); |
| } else if (RuntimeEnabledFeatures::linkServiceWorkerEnabled() && m_relAttribute.isServiceWorker()) { |
| if (document().frame()) |
| m_link = document().frame()->loader().client()->createServiceWorkerLinkResource(this); |
| } else { |
| LinkStyle* link = LinkStyle::create(this); |
| if (fastHasAttribute(disabledAttr)) { |
| UseCounter::count(document(), UseCounter::HTMLLinkElementDisabled); |
| link->setDisabledState(true); |
| } |
| m_link = link; |
| } |
| } |
| |
| return m_link.get(); |
| } |
| |
| LinkStyle* HTMLLinkElement::linkStyle() const |
| { |
| if (!m_link || m_link->type() != LinkResource::Style) |
| return nullptr; |
| return static_cast<LinkStyle*>(m_link.get()); |
| } |
| |
| LinkImport* HTMLLinkElement::linkImport() const |
| { |
| if (!m_link || m_link->type() != LinkResource::Import) |
| return nullptr; |
| return static_cast<LinkImport*>(m_link.get()); |
| } |
| |
| Document* HTMLLinkElement::import() const |
| { |
| if (LinkImport* link = linkImport()) |
| return link->importedDocument(); |
| return nullptr; |
| } |
| |
| void HTMLLinkElement::process() |
| { |
| if (LinkResource* link = linkResourceToProcess()) |
| link->process(); |
| } |
| |
| Node::InsertionNotificationRequest HTMLLinkElement::insertedInto(ContainerNode* insertionPoint) |
| { |
| HTMLElement::insertedInto(insertionPoint); |
| logAddElementIfIsolatedWorldAndInDocument("link", relAttr, hrefAttr); |
| if (!insertionPoint->isConnected()) |
| return InsertionDone; |
| |
| if (isInShadowTree()) { |
| String message = "HTML element <link> is ignored in shadow tree."; |
| document().addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel, message)); |
| return InsertionDone; |
| } |
| |
| document().styleEngine().addStyleSheetCandidateNode(this); |
| |
| process(); |
| |
| if (m_link) |
| m_link->ownerInserted(); |
| |
| return InsertionDone; |
| } |
| |
| void HTMLLinkElement::removedFrom(ContainerNode* insertionPoint) |
| { |
| // Store the result of isInShadowTree() here before Node::removedFrom(..) clears the flags. |
| bool wasInShadowTree = isInShadowTree(); |
| HTMLElement::removedFrom(insertionPoint); |
| if (!insertionPoint->isConnected()) |
| return; |
| |
| m_linkLoader->released(); |
| |
| if (wasInShadowTree) { |
| ASSERT(!linkStyle() || !linkStyle()->hasSheet()); |
| return; |
| } |
| document().styleEngine().removeStyleSheetCandidateNode(this); |
| |
| StyleSheet* removedSheet = sheet(); |
| |
| if (m_link) |
| m_link->ownerRemoved(); |
| |
| document().styleEngine().setNeedsActiveStyleUpdate(removedSheet, FullStyleUpdate); |
| } |
| |
| void HTMLLinkElement::finishParsingChildren() |
| { |
| m_createdByParser = false; |
| HTMLElement::finishParsingChildren(); |
| } |
| |
| bool HTMLLinkElement::styleSheetIsLoading() const |
| { |
| return linkStyle() && linkStyle()->styleSheetIsLoading(); |
| } |
| |
| void HTMLLinkElement::linkLoaded() |
| { |
| dispatchEvent(Event::create(EventTypeNames::load)); |
| } |
| |
| void HTMLLinkElement::linkLoadingErrored() |
| { |
| dispatchEvent(Event::create(EventTypeNames::error)); |
| } |
| |
| void HTMLLinkElement::didStartLinkPrerender() |
| { |
| dispatchEvent(Event::create(EventTypeNames::webkitprerenderstart)); |
| } |
| |
| void HTMLLinkElement::didStopLinkPrerender() |
| { |
| dispatchEvent(Event::create(EventTypeNames::webkitprerenderstop)); |
| } |
| |
| void HTMLLinkElement::didSendLoadForLinkPrerender() |
| { |
| dispatchEvent(Event::create(EventTypeNames::webkitprerenderload)); |
| } |
| |
| void HTMLLinkElement::didSendDOMContentLoadedForLinkPrerender() |
| { |
| dispatchEvent(Event::create(EventTypeNames::webkitprerenderdomcontentloaded)); |
| } |
| |
| void HTMLLinkElement::valueWasSet() |
| { |
| setSynchronizedLazyAttribute(HTMLNames::sizesAttr, m_sizes->value()); |
| WebVector<WebSize> webIconSizes = WebIconSizesParser::parseIconSizes(m_sizes->value()); |
| m_iconSizes.resize(webIconSizes.size()); |
| for (size_t i = 0; i < webIconSizes.size(); ++i) |
| m_iconSizes[i] = webIconSizes[i]; |
| process(); |
| } |
| |
| bool HTMLLinkElement::sheetLoaded() |
| { |
| ASSERT(linkStyle()); |
| return linkStyle()->sheetLoaded(); |
| } |
| |
| void HTMLLinkElement::notifyLoadedSheetAndAllCriticalSubresources(LoadedSheetErrorStatus errorStatus) |
| { |
| ASSERT(linkStyle()); |
| linkStyle()->notifyLoadedSheetAndAllCriticalSubresources(errorStatus); |
| } |
| |
| void HTMLLinkElement::dispatchPendingLoadEvents() |
| { |
| linkLoadEventSender().dispatchPendingEvents(); |
| } |
| |
| void HTMLLinkElement::dispatchPendingEvent(LinkEventSender* eventSender) |
| { |
| ASSERT_UNUSED(eventSender, eventSender == &linkLoadEventSender()); |
| ASSERT(m_link); |
| if (m_link->hasLoaded()) |
| linkLoaded(); |
| else |
| linkLoadingErrored(); |
| } |
| |
| void HTMLLinkElement::scheduleEvent() |
| { |
| linkLoadEventSender().dispatchEventSoon(this); |
| } |
| |
| void HTMLLinkElement::startLoadingDynamicSheet() |
| { |
| ASSERT(linkStyle()); |
| linkStyle()->startLoadingDynamicSheet(); |
| } |
| |
| bool HTMLLinkElement::isURLAttribute(const Attribute& attribute) const |
| { |
| return attribute.name().localName() == hrefAttr || HTMLElement::isURLAttribute(attribute); |
| } |
| |
| bool HTMLLinkElement::hasLegalLinkAttribute(const QualifiedName& name) const |
| { |
| return name == hrefAttr || HTMLElement::hasLegalLinkAttribute(name); |
| } |
| |
| const QualifiedName& HTMLLinkElement::subResourceAttributeName() const |
| { |
| // If the link element is not css, ignore it. |
| if (equalIgnoringCase(getAttribute(typeAttr), "text/css")) { |
| // FIXME: Add support for extracting links of sub-resources which |
| // are inside style-sheet such as @import, @font-face, url(), etc. |
| return hrefAttr; |
| } |
| return HTMLElement::subResourceAttributeName(); |
| } |
| |
| KURL HTMLLinkElement::href() const |
| { |
| return document().completeURL(getAttribute(hrefAttr)); |
| } |
| |
| const AtomicString& HTMLLinkElement::rel() const |
| { |
| return getAttribute(relAttr); |
| } |
| |
| const AtomicString& HTMLLinkElement::type() const |
| { |
| return getAttribute(typeAttr); |
| } |
| |
| bool HTMLLinkElement::async() const |
| { |
| return fastHasAttribute(HTMLNames::asyncAttr); |
| } |
| |
| IconType HTMLLinkElement::getIconType() const |
| { |
| return m_relAttribute.getIconType(); |
| } |
| |
| const Vector<IntSize>& HTMLLinkElement::iconSizes() const |
| { |
| return m_iconSizes; |
| } |
| |
| DOMTokenList* HTMLLinkElement::sizes() const |
| { |
| return m_sizes.get(); |
| } |
| |
| DEFINE_TRACE(HTMLLinkElement) |
| { |
| visitor->trace(m_link); |
| visitor->trace(m_sizes); |
| visitor->trace(m_linkLoader); |
| visitor->trace(m_relList); |
| HTMLElement::trace(visitor); |
| LinkLoaderClient::trace(visitor); |
| DOMTokenListObserver::trace(visitor); |
| } |
| |
| DEFINE_TRACE_WRAPPERS(HTMLLinkElement) |
| { |
| visitor->traceWrappers(m_relList); |
| HTMLElement::traceWrappers(visitor); |
| } |
| |
| LinkStyle* LinkStyle::create(HTMLLinkElement* owner) |
| { |
| return new LinkStyle(owner); |
| } |
| |
| LinkStyle::LinkStyle(HTMLLinkElement* owner) |
| : LinkResource(owner) |
| , m_disabledState(Unset) |
| , m_pendingSheetType(None) |
| , m_loading(false) |
| , m_firedLoad(false) |
| , m_loadedSheet(false) |
| , m_fetchFollowingCORS(false) |
| { |
| } |
| |
| LinkStyle::~LinkStyle() |
| { |
| } |
| |
| Document& LinkStyle::document() |
| { |
| return m_owner->document(); |
| } |
| |
| enum StyleSheetCacheStatus { |
| StyleSheetNewEntry, |
| StyleSheetInDiskCache, |
| StyleSheetInMemoryCache, |
| StyleSheetCacheStatusCount, |
| }; |
| |
| void LinkStyle::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource* cachedStyleSheet) |
| { |
| if (!m_owner->isInDocumentTree()) { |
| // While the stylesheet is asynchronously loading, the owner can be moved out of a document tree. |
| // In that case, cancel any processing on the loaded content. |
| m_loading = false; |
| removePendingSheet(); |
| if (m_sheet) |
| clearSheet(); |
| return; |
| } |
| |
| // See the comment in PendingScript.cpp about why this check is necessary |
| // here, instead of in the resource fetcher. https://crbug.com/500701. |
| if (!cachedStyleSheet->errorOccurred() && m_owner->fastHasAttribute(HTMLNames::integrityAttr) && cachedStyleSheet->resourceBuffer() && !SubresourceIntegrity::CheckSubresourceIntegrity(*m_owner, cachedStyleSheet->resourceBuffer()->data(), cachedStyleSheet->resourceBuffer()->size(), KURL(baseURL, href), *cachedStyleSheet)) { |
| m_loading = false; |
| removePendingSheet(); |
| notifyLoadedSheetAndAllCriticalSubresources(Node::ErrorOccurredLoadingSubresource); |
| return; |
| } |
| |
| CSSParserContext parserContext(m_owner->document(), nullptr, baseURL, charset); |
| |
| DEFINE_STATIC_LOCAL(EnumerationHistogram, restoredCachedStyleSheetHistogram, ("Blink.RestoredCachedStyleSheet", 2)); |
| DEFINE_STATIC_LOCAL(EnumerationHistogram, restoredCachedStyleSheet2Histogram, ("Blink.RestoredCachedStyleSheet2", StyleSheetCacheStatusCount)); |
| |
| if (StyleSheetContents* restoredSheet = const_cast<CSSStyleSheetResource*>(cachedStyleSheet)->restoreParsedStyleSheet(parserContext)) { |
| ASSERT(restoredSheet->isCacheableForResource()); |
| ASSERT(!restoredSheet->isLoading()); |
| |
| if (m_sheet) |
| clearSheet(); |
| m_sheet = CSSStyleSheet::create(restoredSheet, m_owner); |
| m_sheet->setMediaQueries(MediaQuerySet::create(m_owner->media())); |
| m_sheet->setTitle(m_owner->title()); |
| setCrossOriginStylesheetStatus(m_sheet.get()); |
| |
| m_loading = false; |
| restoredSheet->checkLoaded(); |
| |
| restoredCachedStyleSheetHistogram.count(true); |
| restoredCachedStyleSheet2Histogram.count(StyleSheetInMemoryCache); |
| return; |
| } |
| restoredCachedStyleSheetHistogram.count(false); |
| StyleSheetCacheStatus cacheStatus = cachedStyleSheet->response().wasCached() ? StyleSheetInDiskCache : StyleSheetNewEntry; |
| restoredCachedStyleSheet2Histogram.count(cacheStatus); |
| |
| StyleSheetContents* styleSheet = StyleSheetContents::create(href, parserContext); |
| |
| if (m_sheet) |
| clearSheet(); |
| |
| m_sheet = CSSStyleSheet::create(styleSheet, m_owner); |
| m_sheet->setMediaQueries(MediaQuerySet::create(m_owner->media())); |
| m_sheet->setTitle(m_owner->title()); |
| setCrossOriginStylesheetStatus(m_sheet.get()); |
| |
| styleSheet->parseAuthorStyleSheet(cachedStyleSheet, m_owner->document().getSecurityOrigin()); |
| |
| m_loading = false; |
| styleSheet->notifyLoadedSheet(cachedStyleSheet); |
| styleSheet->checkLoaded(); |
| |
| if (styleSheet->isCacheableForResource()) |
| const_cast<CSSStyleSheetResource*>(cachedStyleSheet)->saveParsedStyleSheet(styleSheet); |
| clearResource(); |
| } |
| |
| bool LinkStyle::sheetLoaded() |
| { |
| if (!styleSheetIsLoading()) { |
| removePendingSheet(); |
| return true; |
| } |
| return false; |
| } |
| |
| void LinkStyle::notifyLoadedSheetAndAllCriticalSubresources(Node::LoadedSheetErrorStatus errorStatus) |
| { |
| if (m_firedLoad) |
| return; |
| m_loadedSheet = (errorStatus == Node::NoErrorLoadingSubresource); |
| if (m_owner) |
| m_owner->scheduleEvent(); |
| m_firedLoad = true; |
| } |
| |
| void LinkStyle::startLoadingDynamicSheet() |
| { |
| ASSERT(m_pendingSheetType < Blocking); |
| addPendingSheet(Blocking); |
| } |
| |
| void LinkStyle::clearSheet() |
| { |
| ASSERT(m_sheet); |
| ASSERT(m_sheet->ownerNode() == m_owner); |
| m_sheet.release()->clearOwnerNode(); |
| } |
| |
| bool LinkStyle::styleSheetIsLoading() const |
| { |
| if (m_loading) |
| return true; |
| if (!m_sheet) |
| return false; |
| return m_sheet->contents()->isLoading(); |
| } |
| |
| void LinkStyle::addPendingSheet(PendingSheetType type) |
| { |
| if (type <= m_pendingSheetType) |
| return; |
| m_pendingSheetType = type; |
| |
| if (m_pendingSheetType == NonBlocking) |
| return; |
| m_owner->document().styleEngine().addPendingSheet(m_styleEngineContext); |
| } |
| |
| void LinkStyle::removePendingSheet() |
| { |
| PendingSheetType type = m_pendingSheetType; |
| m_pendingSheetType = None; |
| |
| if (type == None) |
| return; |
| if (type == NonBlocking) { |
| // Tell StyleEngine to re-compute styleSheets of this m_owner's treescope. |
| m_owner->document().styleEngine().modifiedStyleSheetCandidateNode(m_owner); |
| return; |
| } |
| |
| m_owner->document().styleEngine().removePendingSheet(m_owner, m_styleEngineContext); |
| } |
| |
| void LinkStyle::setDisabledState(bool disabled) |
| { |
| LinkStyle::DisabledState oldDisabledState = m_disabledState; |
| m_disabledState = disabled ? Disabled : EnabledViaScript; |
| if (oldDisabledState != m_disabledState) { |
| // 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_owner->relAttribute().isAlternate() && m_disabledState == EnabledViaScript) |
| addPendingSheet(Blocking); |
| |
| // 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_owner->relAttribute().isAlternate() && m_disabledState == EnabledViaScript && oldDisabledState == Disabled) |
| addPendingSheet(Blocking); |
| |
| // If the sheet is already loading just bail. |
| return; |
| } |
| |
| if (m_sheet) { |
| m_sheet->setDisabled(disabled); |
| return; |
| } |
| |
| if (m_disabledState == EnabledViaScript && m_owner->shouldProcessStyle()) |
| process(); |
| } |
| } |
| |
| void LinkStyle::setCrossOriginStylesheetStatus(CSSStyleSheet* sheet) |
| { |
| if (m_fetchFollowingCORS && resource() && !resource()->errorOccurred()) { |
| // Record the security origin the CORS access check succeeded at, if cross origin. |
| // Only origins that are script accessible to it may access the stylesheet's rules. |
| sheet->setAllowRuleAccessFromOrigin(m_owner->document().getSecurityOrigin()); |
| } |
| m_fetchFollowingCORS = false; |
| } |
| |
| void LinkStyle::process() |
| { |
| ASSERT(m_owner->shouldProcessStyle()); |
| String type = m_owner->typeValue().lower(); |
| String as = m_owner->asValue().lower(); |
| String media = m_owner->media().lower(); |
| LinkRequestBuilder builder(m_owner); |
| |
| if (m_owner->relAttribute().getIconType() != InvalidIcon && builder.url().isValid() && !builder.url().isEmpty()) { |
| if (!m_owner->shouldLoadLink()) |
| return; |
| if (!document().getSecurityOrigin()->canDisplay(builder.url())) |
| return; |
| if (!document().contentSecurityPolicy()->allowImageFromSource(builder.url())) |
| return; |
| if (document().frame() && document().frame()->loader().client()) |
| document().frame()->loader().client()->dispatchDidChangeIcons(m_owner->relAttribute().getIconType()); |
| } |
| |
| if (!m_owner->loadLink(type, as, media, builder.url())) |
| return; |
| |
| if (m_disabledState != Disabled && m_owner->relAttribute().isStyleSheet() && styleSheetTypeIsSupported(type) && shouldLoadResource() && builder.url().isValid()) { |
| if (resource()) { |
| removePendingSheet(); |
| clearResource(); |
| clearFetchFollowingCORS(); |
| } |
| |
| if (!m_owner->shouldLoadLink()) |
| return; |
| |
| m_loading = true; |
| |
| String title = m_owner->title(); |
| if (!title.isEmpty() && !m_owner->isAlternate() && m_disabledState != EnabledViaScript) |
| document().styleEngine().setPreferredStylesheetSetNameIfNotSet(title); |
| |
| bool mediaQueryMatches = true; |
| LocalFrame* frame = loadingFrame(); |
| if (!m_owner->media().isEmpty() && frame) { |
| MediaQuerySet* media = MediaQuerySet::create(m_owner->media()); |
| MediaQueryEvaluator evaluator(frame); |
| mediaQueryMatches = evaluator.eval(media); |
| } |
| |
| // Don't hold up layout tree construction and script execution on stylesheets |
| // that are not needed for the layout at the moment. |
| bool blocking = mediaQueryMatches && !m_owner->isAlternate() && m_owner->isCreatedByParser(); |
| addPendingSheet(blocking ? Blocking : NonBlocking); |
| |
| // Load stylesheets that are not needed for the layout immediately with low priority. |
| // When the link element is created by scripts, load the stylesheets asynchronously but in high priority. |
| bool lowPriority = !mediaQueryMatches || m_owner->isAlternate(); |
| FetchRequest request = builder.build(lowPriority); |
| CrossOriginAttributeValue crossOrigin = crossOriginAttributeValue(m_owner->fastGetAttribute(HTMLNames::crossoriginAttr)); |
| if (crossOrigin != CrossOriginAttributeNotSet) { |
| request.setCrossOriginAccessControl(document().getSecurityOrigin(), crossOrigin); |
| setFetchFollowingCORS(); |
| } |
| |
| String integrityAttr = m_owner->fastGetAttribute(HTMLNames::integrityAttr); |
| if (!integrityAttr.isEmpty()) { |
| IntegrityMetadataSet metadataSet; |
| SubresourceIntegrity::parseIntegrityAttribute(integrityAttr, metadataSet); |
| request.setIntegrityMetadata(metadataSet); |
| } |
| setResource(CSSStyleSheetResource::fetch(request, document().fetcher())); |
| |
| if (m_loading && !resource()) { |
| // The request may have been denied if (for example) the stylesheet is local and the document is remote, or if there was a Content Security Policy Failure. |
| // setCSSStyleSheet() can be called synchronuosly in setResource() and thus resource() is null and |m_loading| is false in such cases even if the request succeeds. |
| m_loading = false; |
| removePendingSheet(); |
| notifyLoadedSheetAndAllCriticalSubresources(Node::ErrorOccurredLoadingSubresource); |
| } |
| } else if (m_sheet) { |
| // we no longer contain a stylesheet, e.g. perhaps rel or type was changed |
| StyleSheet* removedSheet = m_sheet.get(); |
| clearSheet(); |
| document().styleEngine().setNeedsActiveStyleUpdate(removedSheet, FullStyleUpdate); |
| } |
| } |
| |
| void LinkStyle::setSheetTitle(const String& title) |
| { |
| if (m_sheet) |
| m_sheet->setTitle(title); |
| } |
| |
| void LinkStyle::ownerRemoved() |
| { |
| if (m_sheet) |
| clearSheet(); |
| |
| if (styleSheetIsLoading()) |
| removePendingSheet(); |
| } |
| |
| DEFINE_TRACE(LinkStyle) |
| { |
| visitor->trace(m_sheet); |
| LinkResource::trace(visitor); |
| ResourceOwner<StyleSheetResource>::trace(visitor); |
| } |
| |
| } // namespace blink |