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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, 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);
}
#ifdef ANDROID_INSTRUMENT
void* HTMLLinkElement::operator new(size_t size)
{
return Node::operator new(size);
}
void* HTMLLinkElement::operator new[](size_t size)
{
return Node::operator new[](size);
}
void HTMLLinkElement::operator delete(void* p, size_t size)
{
Node::operator delete(p, size);
}
void HTMLLinkElement::operator delete[](void* p, size_t size)
{
Node::operator delete[](p, size);
}
#endif
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();
}
}