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/*
* Copyright (C) 2006, 2007 Rob Buis
* Copyright (C) 2008-2016 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 "InlineStyleSheetOwner.h"
#include "CommonAtomStrings.h"
#include "ContentSecurityPolicy.h"
#include "ElementInlines.h"
#include "Logging.h"
#include "MediaList.h"
#include "MediaQueryParser.h"
#include "MediaQueryParserContext.h"
#include "PluginDocument.h"
#include "ScriptableDocumentParser.h"
#include "ShadowRoot.h"
#include "StyleScope.h"
#include "StyleSheetContents.h"
#include "StyleSheetContentsCache.h"
#include "TextNodeTraversal.h"
#include <wtf/HashMap.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
static CSSParserContext parserContextForElement(const Element& element)
{
auto* shadowRoot = element.containingShadowRoot();
// User agent shadow trees can't contain document-relative URLs. Use blank URL as base allowing cross-document sharing.
auto& baseURL = shadowRoot && shadowRoot->mode() == ShadowRootMode::UserAgent ? aboutBlankURL() : element.document().baseURL();
CSSParserContext result = CSSParserContext { element.document(), baseURL, element.document().characterSetWithUTF8Fallback() };
if (shadowRoot && shadowRoot->mode() == ShadowRootMode::UserAgent)
result.mode = UASheetMode;
return result;
}
InlineStyleSheetOwner::InlineStyleSheetOwner(Document& document, bool createdByParser)
: m_isParsingChildren(createdByParser)
, m_loading(false)
, m_startTextPosition()
{
if (createdByParser && document.scriptableDocumentParser() && !document.isInDocumentWrite())
m_startTextPosition = document.scriptableDocumentParser()->textPosition();
}
InlineStyleSheetOwner::~InlineStyleSheetOwner()
{
if (m_sheet)
clearSheet();
}
void InlineStyleSheetOwner::insertedIntoDocument(Element& element)
{
m_styleScope = Style::Scope::forNode(element);
m_styleScope->addStyleSheetCandidateNode(element, m_isParsingChildren);
if (m_isParsingChildren)
return;
createSheetFromTextContents(element);
}
void InlineStyleSheetOwner::removedFromDocument(Element& element)
{
if (CheckedPtr scope = m_styleScope.get()) {
if (scope->hasPendingSheet(element))
scope->removePendingSheet(element);
scope->removeStyleSheetCandidateNode(element);
}
if (m_sheet)
clearSheet();
}
void InlineStyleSheetOwner::clearDocumentData(Element& element)
{
if (RefPtr sheet = m_sheet)
sheet->clearOwnerNode();
if (CheckedPtr scope = m_styleScope.get())
scope->removeStyleSheetCandidateNode(element);
}
void InlineStyleSheetOwner::childrenChanged(Element& element)
{
if (m_isParsingChildren)
return;
if (!element.isConnected())
return;
createSheetFromTextContents(element);
}
void InlineStyleSheetOwner::finishParsingChildren(Element& element)
{
if (element.isConnected())
createSheetFromTextContents(element);
m_isParsingChildren = false;
}
void InlineStyleSheetOwner::createSheetFromTextContents(Element& element)
{
createSheet(element, TextNodeTraversal::contentsAsString(element));
}
void InlineStyleSheetOwner::clearSheet()
{
ASSERT(m_sheet);
RefPtr sheet = std::exchange(m_sheet, nullptr);
sheet->clearOwnerNode();
}
inline bool isValidCSSContentType(const AtomString& type)
{
// https://html.spec.whatwg.org/multipage/semantics.html#update-a-style-block
if (type.isEmpty())
return true;
return equalLettersIgnoringASCIICase(type, "text/css"_s);
}
void InlineStyleSheetOwner::createSheet(Element& element, const String& text)
{
ASSERT(element.isConnected());
Ref document = element.document();
if (RefPtr sheet = m_sheet) {
if (sheet->isLoading() && m_styleScope)
CheckedRef { *m_styleScope }->removePendingSheet(element);
clearSheet();
}
if (!isValidCSSContentType(m_contentType))
return;
ASSERT(document->contentSecurityPolicy());
if (!document->checkedContentSecurityPolicy()->allowInlineStyle(document->url().string(), m_startTextPosition.m_line, text, CheckUnsafeHashes::No, element, element.nonce(), element.isInUserAgentShadowTree() || is<PluginDocument>(document))) {
element.notifyLoadedSheetAndAllCriticalSubresources(true);
return;
}
auto mediaQueries = MQ::MediaQueryParser::parse(m_media, MediaQueryParserContext(document));
if (CheckedPtr scope = m_styleScope.get())
scope->addPendingSheet(element);
Style::StyleSheetContentsCache::Key cacheKey { text, parserContextForElement(element) };
if (RefPtr cachedSheet = Style::StyleSheetContentsCache::singleton().get(cacheKey)) {
ASSERT(cachedSheet->isCacheableWithNoBaseURLDependency());
Ref sheet = CSSStyleSheet::createInline(*cachedSheet, element, m_startTextPosition);
m_sheet = sheet.copyRef();
sheet->setMediaQueries(WTFMove(mediaQueries));
if (!element.isInShadowTree())
sheet->setTitle(element.title());
sheetLoaded(element);
element.notifyLoadedSheetAndAllCriticalSubresources(false);
return;
}
m_loading = true;
Ref contents = StyleSheetContents::create(String(), cacheKey.second);
Ref sheet = CSSStyleSheet::createInline(contents.get(), element, m_startTextPosition);
m_sheet = sheet.copyRef();
sheet->setMediaQueries(WTFMove(mediaQueries));
if (!element.isInShadowTree())
sheet->setTitle(element.title());
contents->parseString(text);
m_loading = false;
contents->checkLoaded();
if (contents->isCacheableWithNoBaseURLDependency())
Style::StyleSheetContentsCache::singleton().add(WTFMove(cacheKey), contents);
}
bool InlineStyleSheetOwner::isLoading() const
{
if (m_loading)
return true;
return m_sheet && m_sheet->isLoading();
}
bool InlineStyleSheetOwner::sheetLoaded(Element& element)
{
if (isLoading())
return false;
if (CheckedPtr scope = m_styleScope.get())
scope->removePendingSheet(element);
return true;
}
void InlineStyleSheetOwner::startLoadingDynamicSheet(Element& element)
{
if (CheckedPtr scope = m_styleScope.get(); scope && !scope->hasPendingSheet(element))
scope->addPendingSheet(element);
}
}
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