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/*
* (C) 1999-2003 Lars Knoll (knoll@kde.org)
* (C) 2002-2003 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2002-2024 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 "StyleRuleImport.h"
#include "CSSStyleSheet.h"
#include "CachedCSSStyleSheet.h"
#include "CachedResourceLoader.h"
#include "CachedResourceRequest.h"
#include "CachedResourceRequestInitiatorTypes.h"
#include "Document.h"
#include "DocumentInlines.h"
#include "MediaList.h"
#include "MediaQueryParserContext.h"
#include "Page.h"
#include "SecurityOrigin.h"
#include "StyleSheetContents.h"
#include <wtf/StdLibExtras.h>
namespace WebCore {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(StyleRuleImport);
Ref<StyleRuleImport> StyleRuleImport::create(const String& href, MQ::MediaQueryList&& mediaQueries, std::optional<CascadeLayerName>&& cascadeLayerName, SupportsCondition&& supportsCondition)
{
return adoptRef(*new StyleRuleImport(href, WTFMove(mediaQueries), WTFMove(cascadeLayerName), WTFMove(supportsCondition)));
}
StyleRuleImport::StyleRuleImport(const String& href, MQ::MediaQueryList&& mediaQueries, std::optional<CascadeLayerName>&& cascadeLayerName, SupportsCondition&& supportsCondition)
: StyleRuleBase(StyleRuleType::Import)
, m_styleSheetClient(this)
, m_strHref(href)
, m_mediaQueries(WTFMove(mediaQueries))
, m_cascadeLayerName(WTFMove(cascadeLayerName))
, m_supportsCondition(WTFMove(supportsCondition))
{
}
void StyleRuleImport::cancelLoad()
{
if (!isLoading())
return;
m_loading = false;
if (m_parentStyleSheet)
m_parentStyleSheet->checkLoaded();
}
StyleRuleImport::~StyleRuleImport()
{
if (m_styleSheet)
m_styleSheet->clearOwnerRule();
if (m_cachedSheet)
m_cachedSheet->removeClient(m_styleSheetClient);
}
void StyleRuleImport::setCSSStyleSheet(const String& href, const URL& baseURL, ASCIILiteral charset, const CachedCSSStyleSheet* cachedStyleSheet)
{
if (m_styleSheet)
m_styleSheet->clearOwnerRule();
CSSParserContext context = m_parentStyleSheet ? m_parentStyleSheet->parserContext() : HTMLStandardMode;
context.charset = charset;
if (!baseURL.isNull())
context.baseURL = baseURL;
Document* document = m_parentStyleSheet ? m_parentStyleSheet->singleOwnerDocument() : nullptr;
m_styleSheet = StyleSheetContents::create(this, href, context);
if ((m_parentStyleSheet && m_parentStyleSheet->isContentOpaque()) || !cachedStyleSheet->isCORSSameOrigin())
m_styleSheet->setAsOpaque();
bool parseSucceeded = m_styleSheet->parseAuthorStyleSheet(cachedStyleSheet, document ? &document->securityOrigin() : nullptr);
m_loading = false;
if (m_parentStyleSheet) {
if (parseSucceeded)
m_parentStyleSheet->notifyLoadedSheet(cachedStyleSheet);
else
m_parentStyleSheet->setLoadErrorOccured();
m_parentStyleSheet->checkLoaded();
}
}
bool StyleRuleImport::isLoading() const
{
return m_loading || (m_styleSheet && m_styleSheet->isLoading());
}
void StyleRuleImport::requestStyleSheet()
{
if (!m_parentStyleSheet)
return;
auto* document = m_parentStyleSheet->singleOwnerDocument();
if (!document)
return;
auto* page = document->page();
if (!page)
return;
URL absURL;
if (!m_parentStyleSheet->baseURL().isNull())
// use parent styleheet's URL as the base URL
absURL = URL(m_parentStyleSheet->baseURL(), m_strHref);
else
absURL = document->completeURL(m_strHref);
// Check for a cycle in our import chain. If we encounter a stylesheet
// in our parent chain with the same URL, then just bail.
StyleSheetContents* rootSheet = m_parentStyleSheet;
for (StyleSheetContents* sheet = m_parentStyleSheet; sheet; sheet = sheet->parentStyleSheet()) {
if (equalIgnoringFragmentIdentifier(absURL, sheet->baseURL())
|| equalIgnoringFragmentIdentifier(absURL, document->completeURL(sheet->originalURL())))
return;
rootSheet = sheet;
}
// FIXME: Skip Content Security Policy check when stylesheet is in a user agent shadow tree.
// See <https://bugs.webkit.org/show_bug.cgi?id=146663>.
CachedResourceRequest request(absURL, CachedResourceLoader::defaultCachedResourceOptions(), std::nullopt, String(m_parentStyleSheet->charset()));
request.setInitiatorType(cachedResourceRequestInitiatorTypes().css);
if (m_cachedSheet)
m_cachedSheet->removeClient(m_styleSheetClient);
if (m_parentStyleSheet->isUserStyleSheet()) {
ResourceLoaderOptions options {
SendCallbackPolicy::DoNotSendCallbacks,
ContentSniffingPolicy::SniffContent,
DataBufferingPolicy::BufferData,
StoredCredentialsPolicy::Use,
ClientCredentialPolicy::MayAskClientForCredentials,
FetchOptions::Credentials::Include,
SecurityCheckPolicy::SkipSecurityCheck,
FetchOptions::Mode::NoCors,
CertificateInfoPolicy::DoNotIncludeCertificateInfo,
ContentSecurityPolicyImposition::SkipPolicyCheck,
DefersLoadingPolicy::AllowDefersLoading,
CachingPolicy::AllowCaching
};
options.loadedFromOpaqueSource = m_parentStyleSheet->isContentOpaque() ? LoadedFromOpaqueSource::Yes : LoadedFromOpaqueSource::No;
request.setOptions(WTFMove(options));
m_cachedSheet = document->protectedCachedResourceLoader()->requestUserCSSStyleSheet(*page, WTFMove(request));
} else {
auto options = request.options();
options.loadedFromOpaqueSource = m_parentStyleSheet->isContentOpaque() ? LoadedFromOpaqueSource::Yes : LoadedFromOpaqueSource::No;
request.setOptions(WTFMove(options));
m_cachedSheet = document->protectedCachedResourceLoader()->requestCSSStyleSheet(WTFMove(request)).value_or(nullptr);
}
if (m_cachedSheet) {
// if the import rule is issued dynamically, the sheet may be
// removed from the pending sheet count, so let the doc know
// the sheet being imported is pending.
if (m_parentStyleSheet && m_parentStyleSheet->loadCompleted() && rootSheet == m_parentStyleSheet)
m_parentStyleSheet->startLoadingDynamicSheet();
m_loading = true;
m_cachedSheet->addClient(m_styleSheetClient);
} else if (m_parentStyleSheet) {
m_parentStyleSheet->setLoadErrorOccured();
m_parentStyleSheet->checkLoaded();
}
}
} // namespace WebCore
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