| /* |
| * 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) |
| * |
| * 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 "CSSStyleSelector.h" |
| #include "Document.h" |
| #include "Frame.h" |
| #include "FrameLoader.h" |
| #include "FrameLoaderClient.h" |
| #include "FrameTree.h" |
| #include "FrameView.h" |
| #include "HTMLNames.h" |
| #include "HTMLParserIdioms.h" |
| #include "MediaList.h" |
| #include "MediaQueryEvaluator.h" |
| #include "Page.h" |
| #include "ResourceHandle.h" |
| #include "ScriptEventListener.h" |
| #include "Settings.h" |
| #include <wtf/StdLibExtras.h> |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| inline HTMLLinkElement::HTMLLinkElement(const QualifiedName& tagName, Document* document, bool createdByParser) |
| : HTMLElement(tagName, document) |
| #if ENABLE(LINK_PREFETCH) |
| , m_onloadTimer(this, &HTMLLinkElement::onloadTimerFired) |
| #endif |
| , m_disabledState(Unset) |
| , m_loading(false) |
| , m_createdByParser(createdByParser) |
| , m_isInShadowTree(false) |
| , m_pendingSheetType(None) |
| { |
| ASSERT(hasTagName(linkTag)); |
| } |
| |
| PassRefPtr<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); |
| removePendingSheet(); |
| } |
| |
| #if ENABLE(LINK_PREFETCH) |
| if (m_cachedLinkResource) |
| m_cachedLinkResource->removeClient(this); |
| #endif |
| } |
| |
| void HTMLLinkElement::setDisabledState(bool _disabled) |
| { |
| 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 (isLoading()) { |
| // 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.m_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_relAttribute.m_isAlternate && m_disabledState == EnabledViaScript && oldDisabledState == Disabled) |
| addPendingSheet(Blocking); |
| |
| // 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 |
| document()->styleSelectorChanged(DeferRecalcStyle); // Update the style selector. |
| } |
| } |
| |
| StyleSheet* HTMLLinkElement::sheet() const |
| { |
| return m_sheet.get(); |
| } |
| |
| void HTMLLinkElement::parseMappedAttribute(Attribute* attr) |
| { |
| if (attr->name() == relAttr) { |
| tokenizeRelAttribute(attr->value(), m_relAttribute); |
| process(); |
| } else if (attr->name() == hrefAttr) { |
| m_url = document()->completeURL(stripLeadingAndTrailingHTMLSpaces(attr->value())); |
| process(); |
| } else if (attr->name() == typeAttr) { |
| m_type = attr->value(); |
| process(); |
| } else if (attr->name() == mediaAttr) { |
| m_media = attr->value().string().lower(); |
| process(); |
| } else if (attr->name() == disabledAttr) |
| setDisabledState(!attr->isNull()); |
| else if (attr->name() == onbeforeloadAttr) |
| setAttributeEventListener(eventNames().beforeloadEvent, createAttributeEventListener(this, attr)); |
| #if ENABLE(LINK_PREFETCH) |
| else if (attr->name() == onloadAttr) |
| setAttributeEventListener(eventNames().loadEvent, createAttributeEventListener(this, attr)); |
| else if (attr->name() == onerrorAttr) |
| setAttributeEventListener(eventNames().errorEvent, createAttributeEventListener(this, attr)); |
| #endif |
| else { |
| if (attr->name() == titleAttr && m_sheet) |
| m_sheet->setTitle(attr->value()); |
| HTMLElement::parseMappedAttribute(attr); |
| } |
| } |
| |
| void HTMLLinkElement::tokenizeRelAttribute(const AtomicString& rel, RelAttribute& relAttribute) |
| { |
| relAttribute.m_isStyleSheet = false; |
| relAttribute.m_isIcon = false; |
| relAttribute.m_isAlternate = false; |
| relAttribute.m_isDNSPrefetch = false; |
| #if ENABLE(LINK_PREFETCH) |
| relAttribute.m_isLinkPrefetch = false; |
| relAttribute.m_isLinkSubresource = false; |
| #endif |
| #ifdef ANDROID_APPLE_TOUCH_ICON |
| relAttribute.m_isTouchIcon = false; |
| relAttribute.m_isPrecomposedTouchIcon = false; |
| #endif |
| if (equalIgnoringCase(rel, "stylesheet")) |
| relAttribute.m_isStyleSheet = true; |
| else if (equalIgnoringCase(rel, "icon") || equalIgnoringCase(rel, "shortcut icon")) |
| relAttribute.m_isIcon = true; |
| #ifdef ANDROID_APPLE_TOUCH_ICON |
| else if (equalIgnoringCase(rel, "apple-touch-icon")) |
| relAttribute.m_isTouchIcon = true; |
| else if (equalIgnoringCase(rel, "apple-touch-icon-precomposed")) |
| relAttribute.m_isPrecomposedTouchIcon = true; |
| #endif |
| else if (equalIgnoringCase(rel, "dns-prefetch")) |
| relAttribute.m_isDNSPrefetch = true; |
| else if (equalIgnoringCase(rel, "alternate stylesheet") || equalIgnoringCase(rel, "stylesheet alternate")) { |
| relAttribute.m_isStyleSheet = true; |
| relAttribute.m_isAlternate = true; |
| } else { |
| // Tokenize the rel attribute and set bits based on specific keywords that we find. |
| String relString = rel.string(); |
| relString.replace('\n', ' '); |
| Vector<String> list; |
| relString.split(' ', list); |
| Vector<String>::const_iterator end = list.end(); |
| for (Vector<String>::const_iterator it = list.begin(); it != end; ++it) { |
| if (equalIgnoringCase(*it, "stylesheet")) |
| relAttribute.m_isStyleSheet = true; |
| else if (equalIgnoringCase(*it, "alternate")) |
| relAttribute.m_isAlternate = true; |
| else if (equalIgnoringCase(*it, "icon")) |
| relAttribute.m_isIcon = true; |
| #if ENABLE(LINK_PREFETCH) |
| else if (equalIgnoringCase(*it, "prefetch")) |
| relAttribute.m_isLinkPrefetch = true; |
| else if (equalIgnoringCase(*it, "subresource")) |
| relAttribute.m_isLinkSubresource = true; |
| #endif |
| } |
| } |
| } |
| |
| bool HTMLLinkElement::checkBeforeLoadEvent() |
| { |
| RefPtr<Document> originalDocument = document(); |
| if (!dispatchBeforeLoadEvent(m_url)) |
| return false; |
| // A beforeload handler might have removed us from the document or changed the document. |
| if (!inDocument() || document() != originalDocument) |
| return false; |
| return true; |
| } |
| |
| void HTMLLinkElement::process() |
| { |
| if (!inDocument() || m_isInShadowTree) { |
| ASSERT(!m_sheet); |
| return; |
| } |
| |
| String type = m_type.lower(); |
| |
| // IE extension: location of small icon for locationbar / bookmarks |
| // We'll record this URL per document, even if we later only use it in top level frames |
| if (m_relAttribute.m_isIcon && m_url.isValid() && !m_url.isEmpty()) { |
| if (!checkBeforeLoadEvent()) |
| return; |
| document()->setIconURL(m_url.string(), type); |
| } |
| |
| #ifdef ANDROID_APPLE_TOUCH_ICON |
| if ((m_relAttribute.m_isTouchIcon || m_relAttribute.m_isPrecomposedTouchIcon) && m_url.isValid() |
| && !m_url.isEmpty() && document()->frame()) |
| document()->frame()->loader()->client() |
| ->dispatchDidReceiveTouchIconURL(m_url.string(), |
| m_relAttribute.m_isPrecomposedTouchIcon); |
| #endif |
| |
| if (m_relAttribute.m_isDNSPrefetch) { |
| Settings* settings = document()->settings(); |
| // FIXME: The href attribute of the link element can be in "//hostname" form, and we shouldn't attempt |
| // to complete that as URL <https://bugs.webkit.org/show_bug.cgi?id=48857>. |
| if (settings && settings->dnsPrefetchingEnabled() && m_url.isValid() && !m_url.isEmpty()) |
| ResourceHandle::prepareForURL(m_url); |
| } |
| |
| #if ENABLE(LINK_PREFETCH) |
| if ((m_relAttribute.m_isLinkPrefetch || m_relAttribute.m_isLinkSubresource) && m_url.isValid() && document()->frame()) { |
| if (!checkBeforeLoadEvent()) |
| return; |
| ResourceLoadPriority priority = ResourceLoadPriorityUnresolved; |
| if (m_relAttribute.m_isLinkSubresource) |
| priority = ResourceLoadPriorityLow; |
| |
| m_cachedLinkResource = document()->cachedResourceLoader()->requestLinkResource(m_url, priority); |
| if (m_cachedLinkResource) |
| m_cachedLinkResource->addClient(this); |
| } |
| #endif |
| |
| bool acceptIfTypeContainsTextCSS = document()->page() && document()->page()->settings() && document()->page()->settings()->treatsAnyTextCSSLinkAsStylesheet(); |
| |
| if (m_disabledState != Disabled && (m_relAttribute.m_isStyleSheet || (acceptIfTypeContainsTextCSS && type.contains("text/css"))) |
| && document()->frame() && m_url.isValid()) { |
| |
| String charset = getAttribute(charsetAttr); |
| if (charset.isEmpty() && document()->frame()) |
| charset = document()->charset(); |
| |
| if (m_cachedSheet) { |
| removePendingSheet(); |
| m_cachedSheet->removeClient(this); |
| m_cachedSheet = 0; |
| } |
| |
| if (!checkBeforeLoadEvent()) |
| return; |
| |
| m_loading = true; |
| |
| bool mediaQueryMatches = true; |
| if (!m_media.isEmpty()) { |
| RefPtr<RenderStyle> documentStyle = CSSStyleSelector::styleForDocument(document()); |
| RefPtr<MediaList> media = MediaList::createAllowingDescriptionSyntax(m_media); |
| MediaQueryEvaluator evaluator(document()->frame()->view()->mediaType(), document()->frame(), documentStyle.get()); |
| mediaQueryMatches = evaluator.eval(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 blocking = mediaQueryMatches && !isAlternate(); |
| addPendingSheet(blocking ? Blocking : NonBlocking); |
| |
| // Load stylesheets that are not needed for the rendering immediately with low priority. |
| ResourceLoadPriority priority = blocking ? ResourceLoadPriorityUnresolved : ResourceLoadPriorityVeryLow; |
| m_cachedSheet = document()->cachedResourceLoader()->requestCSSStyleSheet(m_url, charset, priority); |
| |
| 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; |
| removePendingSheet(); |
| } |
| } else if (m_sheet) { |
| // we no longer contain a stylesheet, e.g. perhaps rel or type was changed |
| m_sheet = 0; |
| document()->styleSelectorChanged(DeferRecalcStyle); |
| } |
| } |
| |
| void HTMLLinkElement::insertedIntoDocument() |
| { |
| HTMLElement::insertedIntoDocument(); |
| |
| m_isInShadowTree = isInShadowTree(); |
| if (m_isInShadowTree) |
| return; |
| |
| document()->addStyleSheetCandidateNode(this, m_createdByParser); |
| |
| process(); |
| } |
| |
| void HTMLLinkElement::removedFromDocument() |
| { |
| HTMLElement::removedFromDocument(); |
| |
| if (m_isInShadowTree) { |
| ASSERT(!m_sheet); |
| return; |
| } |
| document()->removeStyleSheetCandidateNode(this); |
| |
| if (m_sheet) { |
| ASSERT(m_sheet->ownerNode() == this); |
| m_sheet->clearOwnerNode(); |
| m_sheet = 0; |
| } |
| |
| if (document()->renderer()) |
| document()->styleSelectorChanged(DeferRecalcStyle); |
| } |
| |
| void HTMLLinkElement::finishParsingChildren() |
| { |
| m_createdByParser = false; |
| HTMLElement::finishParsingChildren(); |
| } |
| |
| void HTMLLinkElement::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CachedCSSStyleSheet* sheet) |
| { |
| if (!inDocument()) { |
| ASSERT(!m_sheet); |
| return; |
| } |
| |
| m_sheet = CSSStyleSheet::create(this, href, baseURL, charset); |
| |
| bool strictParsing = !document()->inQuirksMode(); |
| bool enforceMIMEType = strictParsing; |
| bool crossOriginCSS = false; |
| bool validMIMEType = false; |
| bool needsSiteSpecificQuirks = document()->page() && document()->page()->settings()->needsSiteSpecificQuirks(); |
| |
| // Check to see if we should enforce the MIME type of the CSS resource in strict mode. |
| // Running in iWeb 2 is one example of where we don't want to - <rdar://problem/6099748> |
| if (enforceMIMEType && document()->page() && !document()->page()->settings()->enforceCSSMIMETypeInNoQuirksMode()) |
| enforceMIMEType = false; |
| |
| #if defined(BUILDING_ON_TIGER) || defined(BUILDING_ON_LEOPARD) |
| if (enforceMIMEType && needsSiteSpecificQuirks) { |
| // Covers both http and https, with or without "www." |
| if (baseURL.string().contains("mcafee.com/japan/", false)) |
| enforceMIMEType = false; |
| } |
| #endif |
| |
| String sheetText = sheet->sheetText(enforceMIMEType, &validMIMEType); |
| m_sheet->parseString(sheetText, strictParsing); |
| |
| // If we're loading a stylesheet cross-origin, and the MIME type is not |
| // standard, require the CSS to at least start with a syntactically |
| // valid CSS rule. |
| // This prevents an attacker playing games by injecting CSS strings into |
| // HTML, XML, JSON, etc. etc. |
| if (!document()->securityOrigin()->canRequest(baseURL)) |
| crossOriginCSS = true; |
| |
| if (crossOriginCSS && !validMIMEType && !m_sheet->hasSyntacticallyValidCSSHeader()) |
| m_sheet = CSSStyleSheet::create(this, href, baseURL, charset); |
| |
| if (strictParsing && needsSiteSpecificQuirks) { |
| // Work around <https://bugs.webkit.org/show_bug.cgi?id=28350>. |
| DEFINE_STATIC_LOCAL(const String, slashKHTMLFixesDotCss, ("/KHTMLFixes.css")); |
| DEFINE_STATIC_LOCAL(const String, mediaWikiKHTMLFixesStyleSheet, ("/* KHTML fix stylesheet */\n/* work around the horizontal scrollbars */\n#column-content { margin-left: 0; }\n\n")); |
| // There are two variants of KHTMLFixes.css. One is equal to mediaWikiKHTMLFixesStyleSheet, |
| // while the other lacks the second trailing newline. |
| if (baseURL.string().endsWith(slashKHTMLFixesDotCss) && !sheetText.isNull() && mediaWikiKHTMLFixesStyleSheet.startsWith(sheetText) |
| && sheetText.length() >= mediaWikiKHTMLFixesStyleSheet.length() - 1) { |
| ASSERT(m_sheet->length() == 1); |
| ExceptionCode ec; |
| m_sheet->deleteRule(0, ec); |
| } |
| } |
| |
| m_sheet->setTitle(title()); |
| |
| RefPtr<MediaList> media = MediaList::createAllowingDescriptionSyntax(m_media); |
| m_sheet->setMedia(media.get()); |
| |
| m_loading = false; |
| m_sheet->checkLoaded(); |
| } |
| |
| bool HTMLLinkElement::isLoading() const |
| { |
| if (m_loading) |
| return true; |
| if (!m_sheet) |
| return false; |
| return static_cast<CSSStyleSheet *>(m_sheet.get())->isLoading(); |
| } |
| |
| #if ENABLE(LINK_PREFETCH) |
| void HTMLLinkElement::onloadTimerFired(Timer<HTMLLinkElement>* timer) |
| { |
| ASSERT_UNUSED(timer, timer == &m_onloadTimer); |
| if (m_cachedLinkResource->errorOccurred()) |
| dispatchEvent(Event::create(eventNames().errorEvent, false, false)); |
| else |
| dispatchEvent(Event::create(eventNames().loadEvent, false, false)); |
| |
| m_cachedLinkResource->removeClient(this); |
| m_cachedLinkResource = 0; |
| } |
| |
| void HTMLLinkElement::notifyFinished(CachedResource* resource) |
| { |
| m_onloadTimer.startOneShot(0); |
| ASSERT(m_cachedLinkResource.get() == resource); |
| } |
| #endif |
| |
| bool HTMLLinkElement::sheetLoaded() |
| { |
| if (!isLoading()) { |
| removePendingSheet(); |
| return true; |
| } |
| return false; |
| } |
| |
| bool HTMLLinkElement::isURLAttribute(Attribute *attr) const |
| { |
| return attr->name() == hrefAttr; |
| } |
| |
| KURL HTMLLinkElement::href() const |
| { |
| return document()->completeURL(getAttribute(hrefAttr)); |
| } |
| |
| String HTMLLinkElement::rel() const |
| { |
| return getAttribute(relAttr); |
| } |
| |
| String HTMLLinkElement::target() const |
| { |
| return getAttribute(targetAttr); |
| } |
| |
| String HTMLLinkElement::type() const |
| { |
| return getAttribute(typeAttr); |
| } |
| |
| void HTMLLinkElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const |
| { |
| HTMLElement::addSubresourceAttributeURLs(urls); |
| |
| // Favicons are handled by a special case in LegacyWebArchive::create() |
| if (m_relAttribute.m_isIcon) |
| return; |
| |
| if (!m_relAttribute.m_isStyleSheet) |
| return; |
| |
| // Append the URL of this link element. |
| addSubresourceURL(urls, href()); |
| |
| // Walk the URLs linked by the linked-to stylesheet. |
| if (StyleSheet* styleSheet = const_cast<HTMLLinkElement*>(this)->sheet()) |
| styleSheet->addSubresourceStyleURLs(urls); |
| } |
| |
| void HTMLLinkElement::addPendingSheet(PendingSheetType type) |
| { |
| if (type <= m_pendingSheetType) |
| return; |
| m_pendingSheetType = type; |
| |
| if (m_pendingSheetType == NonBlocking) |
| return; |
| document()->addPendingSheet(); |
| } |
| |
| void HTMLLinkElement::removePendingSheet() |
| { |
| PendingSheetType type = m_pendingSheetType; |
| m_pendingSheetType = None; |
| |
| if (type == None) |
| return; |
| if (type == NonBlocking) { |
| // Document::removePendingSheet() triggers the style selector recalc for blocking sheets. |
| document()->styleSelectorChanged(RecalcStyleImmediately); |
| return; |
| } |
| document()->removePendingSheet(); |
| } |
| |
| } |
