| /* |
| * (C) 1999-2003 Lars Knoll (knoll@kde.org) |
| * Copyright (C) 2004-2017 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 "StyleSheetContents.h" |
| |
| #include "CSSImportRule.h" |
| #include "CSSParser.h" |
| #include "CSSStyleSheet.h" |
| #include "CachedCSSStyleSheet.h" |
| #include "ContentRuleListResults.h" |
| #include "Document.h" |
| #include "Frame.h" |
| #include "FrameLoader.h" |
| #include "MediaList.h" |
| #include "Node.h" |
| #include "Page.h" |
| #include "PageConsoleClient.h" |
| #include "ResourceLoadInfo.h" |
| #include "RuleSet.h" |
| #include "SecurityOrigin.h" |
| #include "StyleRule.h" |
| #include "StyleRuleImport.h" |
| #include <wtf/Deque.h> |
| #include <wtf/NeverDestroyed.h> |
| #include <wtf/Ref.h> |
| |
| #if ENABLE(CONTENT_EXTENSIONS) |
| #include "UserContentController.h" |
| #endif |
| |
| namespace WebCore { |
| |
| // Rough size estimate for the memory cache. |
| unsigned StyleSheetContents::estimatedSizeInBytes() const |
| { |
| // Note that this does not take into account size of the strings hanging from various objects. |
| // The assumption is that nearly all of of them are atomic and would exist anyway. |
| unsigned size = sizeof(*this); |
| |
| // FIXME: This ignores the children of media and region rules. |
| // Most rules are StyleRules. |
| size += ruleCount() * StyleRule::averageSizeInBytes(); |
| |
| for (unsigned i = 0; i < m_importRules.size(); ++i) { |
| if (StyleSheetContents* sheet = m_importRules[i]->styleSheet()) |
| size += sheet->estimatedSizeInBytes(); |
| } |
| return size; |
| } |
| |
| StyleSheetContents::StyleSheetContents(StyleRuleImport* ownerRule, const String& originalURL, const CSSParserContext& context) |
| : m_ownerRule(ownerRule) |
| , m_originalURL(originalURL) |
| , m_defaultNamespace(starAtom()) |
| , m_isUserStyleSheet(ownerRule && ownerRule->parentStyleSheet() && ownerRule->parentStyleSheet()->isUserStyleSheet()) |
| , m_parserContext(context) |
| { |
| } |
| |
| StyleSheetContents::StyleSheetContents(const StyleSheetContents& o) |
| : RefCounted<StyleSheetContents>() |
| , m_ownerRule(0) |
| , m_originalURL(o.m_originalURL) |
| , m_encodingFromCharsetRule(o.m_encodingFromCharsetRule) |
| , m_importRules(o.m_importRules.size()) |
| , m_namespaceRules(o.m_namespaceRules.size()) |
| , m_childRules(o.m_childRules.size()) |
| , m_namespaces(o.m_namespaces) |
| , m_defaultNamespace(o.m_defaultNamespace) |
| , m_isUserStyleSheet(o.m_isUserStyleSheet) |
| , m_loadCompleted(true) |
| , m_hasSyntacticallyValidCSSHeader(o.m_hasSyntacticallyValidCSSHeader) |
| , m_usesStyleBasedEditability(o.m_usesStyleBasedEditability) |
| , m_parserContext(o.m_parserContext) |
| { |
| ASSERT(o.isCacheable()); |
| |
| // FIXME: Copy import rules. |
| ASSERT(o.m_importRules.isEmpty()); |
| |
| for (unsigned i = 0; i < m_childRules.size(); ++i) |
| m_childRules[i] = o.m_childRules[i]->copy(); |
| } |
| |
| StyleSheetContents::~StyleSheetContents() |
| { |
| clearRules(); |
| } |
| |
| bool StyleSheetContents::isCacheable() const |
| { |
| // FIXME: Support copying import rules. |
| if (!m_importRules.isEmpty()) |
| return false; |
| // FIXME: Support cached stylesheets in import rules. |
| if (m_ownerRule) |
| return false; |
| // This would require dealing with multiple clients for load callbacks. |
| if (!m_loadCompleted) |
| return false; |
| if (m_didLoadErrorOccur) |
| return false; |
| // It is not the original sheet anymore. |
| if (m_isMutable) |
| return false; |
| // If the header is valid we are not going to need to check the SecurityOrigin. |
| // FIXME: Valid mime type avoids the check too. |
| if (!m_hasSyntacticallyValidCSSHeader) |
| return false; |
| return true; |
| } |
| |
| void StyleSheetContents::parserAppendRule(Ref<StyleRuleBase>&& rule) |
| { |
| ASSERT(!rule->isCharsetRule()); |
| |
| if (is<StyleRuleImport>(rule)) { |
| // Parser enforces that @import rules come before anything else except @charset. |
| ASSERT(m_childRules.isEmpty()); |
| m_importRules.append(downcast<StyleRuleImport>(rule.ptr())); |
| m_importRules.last()->setParentStyleSheet(this); |
| m_importRules.last()->requestStyleSheet(); |
| return; |
| } |
| |
| if (is<StyleRuleNamespace>(rule)) { |
| // Parser enforces that @namespace rules come before all rules other than |
| // import/charset rules |
| ASSERT(m_childRules.isEmpty()); |
| StyleRuleNamespace& namespaceRule = downcast<StyleRuleNamespace>(rule.get()); |
| parserAddNamespace(namespaceRule.prefix(), namespaceRule.uri()); |
| m_namespaceRules.append(downcast<StyleRuleNamespace>(rule.ptr())); |
| return; |
| } |
| |
| if (is<StyleRuleMedia>(rule)) |
| reportMediaQueryWarningIfNeeded(singleOwnerDocument(), downcast<StyleRuleMedia>(rule.get()).mediaQueries()); |
| |
| // NOTE: The selector list has to fit into RuleData. <http://webkit.org/b/118369> |
| // If we're adding a rule with a huge number of selectors, split it up into multiple rules |
| if (is<StyleRule>(rule) && downcast<StyleRule>(rule.get()).selectorList().componentCount() > RuleData::maximumSelectorComponentCount) { |
| m_childRules.appendVector(downcast<StyleRule>(rule.get()).splitIntoMultipleRulesWithMaximumSelectorComponentCount(RuleData::maximumSelectorComponentCount)); |
| return; |
| } |
| |
| m_childRules.append(WTFMove(rule)); |
| } |
| |
| StyleRuleBase* StyleSheetContents::ruleAt(unsigned index) const |
| { |
| ASSERT_WITH_SECURITY_IMPLICATION(index < ruleCount()); |
| |
| unsigned childVectorIndex = index; |
| if (childVectorIndex < m_importRules.size()) |
| return m_importRules[childVectorIndex].get(); |
| |
| childVectorIndex -= m_importRules.size(); |
| |
| if (childVectorIndex < m_namespaceRules.size()) |
| return m_namespaceRules[childVectorIndex].get(); |
| |
| childVectorIndex -= m_namespaceRules.size(); |
| |
| return m_childRules[childVectorIndex].get(); |
| } |
| |
| unsigned StyleSheetContents::ruleCount() const |
| { |
| unsigned result = 0; |
| result += m_importRules.size(); |
| result += m_namespaceRules.size(); |
| result += m_childRules.size(); |
| return result; |
| } |
| |
| void StyleSheetContents::clearCharsetRule() |
| { |
| m_encodingFromCharsetRule = String(); |
| } |
| |
| void StyleSheetContents::clearRules() |
| { |
| for (unsigned i = 0; i < m_importRules.size(); ++i) { |
| ASSERT(m_importRules.at(i)->parentStyleSheet() == this); |
| m_importRules[i]->clearParentStyleSheet(); |
| } |
| m_importRules.clear(); |
| m_namespaceRules.clear(); |
| m_childRules.clear(); |
| clearCharsetRule(); |
| } |
| |
| void StyleSheetContents::parserSetEncodingFromCharsetRule(const String& encoding) |
| { |
| // Parser enforces that there is ever only one @charset. |
| ASSERT(m_encodingFromCharsetRule.isNull()); |
| m_encodingFromCharsetRule = encoding; |
| } |
| |
| bool StyleSheetContents::wrapperInsertRule(Ref<StyleRuleBase>&& rule, unsigned index) |
| { |
| ASSERT(m_isMutable); |
| ASSERT_WITH_SECURITY_IMPLICATION(index <= ruleCount()); |
| // Parser::parseRule doesn't currently allow @charset so we don't need to deal with it. |
| ASSERT(!rule->isCharsetRule()); |
| |
| unsigned childVectorIndex = index; |
| if (childVectorIndex < m_importRules.size() || (childVectorIndex == m_importRules.size() && rule->isImportRule())) { |
| // Inserting non-import rule before @import is not allowed. |
| if (!is<StyleRuleImport>(rule)) |
| return false; |
| m_importRules.insert(childVectorIndex, downcast<StyleRuleImport>(rule.ptr())); |
| m_importRules[childVectorIndex]->setParentStyleSheet(this); |
| m_importRules[childVectorIndex]->requestStyleSheet(); |
| // FIXME: Stylesheet doesn't actually change meaningfully before the imported sheets are loaded. |
| return true; |
| } |
| // Inserting @import rule after a non-import rule is not allowed. |
| if (is<StyleRuleImport>(rule)) |
| return false; |
| childVectorIndex -= m_importRules.size(); |
| |
| |
| if (childVectorIndex < m_namespaceRules.size() || (childVectorIndex == m_namespaceRules.size() && rule->isNamespaceRule())) { |
| // Inserting non-namespace rules other than import rule before @namespace is |
| // not allowed. |
| if (!is<StyleRuleNamespace>(rule)) |
| return false; |
| // Inserting @namespace rule when rules other than import/namespace/charset |
| // are present is not allowed. |
| if (!m_childRules.isEmpty()) |
| return false; |
| |
| StyleRuleNamespace& namespaceRule = downcast<StyleRuleNamespace>(rule.get()); |
| m_namespaceRules.insert(index, downcast<StyleRuleNamespace>(rule.ptr())); |
| |
| // For now to be compatible with IE and Firefox if a namespace rule with the same |
| // prefix is added, it overwrites previous ones. |
| // FIXME: The eventual correct behavior would be to ensure that the last value in |
| // the list wins. |
| parserAddNamespace(namespaceRule.prefix(), namespaceRule.uri()); |
| return true; |
| } |
| if (is<StyleRuleNamespace>(rule)) |
| return false; |
| childVectorIndex -= m_namespaceRules.size(); |
| |
| // If the number of selectors would overflow RuleData, we drop the operation. |
| if (is<StyleRule>(rule) && downcast<StyleRule>(rule.get()).selectorList().componentCount() > RuleData::maximumSelectorComponentCount) |
| return false; |
| |
| m_childRules.insert(childVectorIndex, WTFMove(rule)); |
| return true; |
| } |
| |
| void StyleSheetContents::wrapperDeleteRule(unsigned index) |
| { |
| ASSERT(m_isMutable); |
| ASSERT_WITH_SECURITY_IMPLICATION(index < ruleCount()); |
| |
| unsigned childVectorIndex = index; |
| if (childVectorIndex < m_importRules.size()) { |
| m_importRules[childVectorIndex]->clearParentStyleSheet(); |
| m_importRules.remove(childVectorIndex); |
| return; |
| } |
| childVectorIndex -= m_importRules.size(); |
| |
| if (childVectorIndex < m_namespaceRules.size()) { |
| if (!m_childRules.isEmpty()) |
| return; |
| m_namespaceRules.remove(childVectorIndex); |
| return; |
| } |
| childVectorIndex -= m_namespaceRules.size(); |
| |
| m_childRules.remove(childVectorIndex); |
| } |
| |
| void StyleSheetContents::parserAddNamespace(const AtomicString& prefix, const AtomicString& uri) |
| { |
| ASSERT(!uri.isNull()); |
| if (prefix.isNull()) { |
| m_defaultNamespace = uri; |
| return; |
| } |
| PrefixNamespaceURIMap::AddResult result = m_namespaces.add(prefix, uri); |
| if (result.isNewEntry) |
| return; |
| result.iterator->value = uri; |
| } |
| |
| const AtomicString& StyleSheetContents::namespaceURIFromPrefix(const AtomicString& prefix) |
| { |
| PrefixNamespaceURIMap::const_iterator it = m_namespaces.find(prefix); |
| if (it == m_namespaces.end()) |
| return nullAtom(); |
| return it->value; |
| } |
| |
| void StyleSheetContents::parseAuthorStyleSheet(const CachedCSSStyleSheet* cachedStyleSheet, const SecurityOrigin* securityOrigin) |
| { |
| bool isSameOriginRequest = securityOrigin && securityOrigin->canRequest(baseURL()); |
| CachedCSSStyleSheet::MIMETypeCheckHint mimeTypeCheckHint = isStrictParserMode(m_parserContext.mode) || !isSameOriginRequest ? CachedCSSStyleSheet::MIMETypeCheckHint::Strict : CachedCSSStyleSheet::MIMETypeCheckHint::Lax; |
| bool hasValidMIMEType = true; |
| String sheetText = cachedStyleSheet->sheetText(mimeTypeCheckHint, &hasValidMIMEType); |
| |
| if (!hasValidMIMEType) { |
| ASSERT(sheetText.isNull()); |
| if (auto* document = singleOwnerDocument()) { |
| if (auto* page = document->page()) { |
| if (isStrictParserMode(m_parserContext.mode)) |
| page->console().addMessage(MessageSource::Security, MessageLevel::Error, makeString("Did not parse stylesheet at '", cachedStyleSheet->url().stringCenterEllipsizedToLength(), "' because non CSS MIME types are not allowed in strict mode.")); |
| else if (!cachedStyleSheet->mimeTypeAllowedByNosniff()) |
| page->console().addMessage(MessageSource::Security, MessageLevel::Error, makeString("Did not parse stylesheet at '", cachedStyleSheet->url().stringCenterEllipsizedToLength(), "' because non CSS MIME types are not allowed when 'X-Content-Type: nosniff' is given.")); |
| else |
| page->console().addMessage(MessageSource::Security, MessageLevel::Error, makeString("Did not parse stylesheet at '", cachedStyleSheet->url().stringCenterEllipsizedToLength(), "' because non CSS MIME types are not allowed for cross-origin stylesheets.")); |
| } |
| } |
| return; |
| } |
| |
| CSSParser(parserContext()).parseSheet(this, sheetText, CSSParser::RuleParsing::Deferred); |
| } |
| |
| bool StyleSheetContents::parseString(const String& sheetText) |
| { |
| CSSParser p(parserContext()); |
| p.parseSheet(this, sheetText, parserContext().mode != UASheetMode ? CSSParser::RuleParsing::Deferred : CSSParser::RuleParsing::Normal); |
| return true; |
| } |
| |
| bool StyleSheetContents::isLoading() const |
| { |
| for (unsigned i = 0; i < m_importRules.size(); ++i) { |
| if (m_importRules[i]->isLoading()) |
| return true; |
| } |
| return false; |
| } |
| |
| void StyleSheetContents::checkLoaded() |
| { |
| if (isLoading()) |
| return; |
| |
| Ref<StyleSheetContents> protectedThis(*this); |
| StyleSheetContents* parentSheet = parentStyleSheet(); |
| if (parentSheet) { |
| parentSheet->checkLoaded(); |
| m_loadCompleted = true; |
| return; |
| } |
| RefPtr<Node> ownerNode = singleOwnerNode(); |
| if (!ownerNode) { |
| m_loadCompleted = true; |
| return; |
| } |
| m_loadCompleted = ownerNode->sheetLoaded(); |
| if (m_loadCompleted) |
| ownerNode->notifyLoadedSheetAndAllCriticalSubresources(m_didLoadErrorOccur); |
| } |
| |
| void StyleSheetContents::notifyLoadedSheet(const CachedCSSStyleSheet* sheet) |
| { |
| ASSERT(sheet); |
| m_didLoadErrorOccur |= sheet->errorOccurred(); |
| m_didLoadErrorOccur |= !sheet->mimeTypeAllowedByNosniff(); |
| } |
| |
| void StyleSheetContents::startLoadingDynamicSheet() |
| { |
| if (Node* owner = singleOwnerNode()) |
| owner->startLoadingDynamicSheet(); |
| } |
| |
| StyleSheetContents* StyleSheetContents::rootStyleSheet() const |
| { |
| const StyleSheetContents* root = this; |
| while (root->parentStyleSheet()) |
| root = root->parentStyleSheet(); |
| return const_cast<StyleSheetContents*>(root); |
| } |
| |
| Node* StyleSheetContents::singleOwnerNode() const |
| { |
| StyleSheetContents* root = rootStyleSheet(); |
| if (root->m_clients.isEmpty()) |
| return 0; |
| ASSERT(root->m_clients.size() == 1); |
| return root->m_clients[0]->ownerNode(); |
| } |
| |
| Document* StyleSheetContents::singleOwnerDocument() const |
| { |
| Node* ownerNode = singleOwnerNode(); |
| return ownerNode ? &ownerNode->document() : 0; |
| } |
| |
| URL StyleSheetContents::completeURL(const String& url) const |
| { |
| return m_parserContext.completeURL(url); |
| } |
| |
| static bool traverseRulesInVector(const Vector<RefPtr<StyleRuleBase>>& rules, const WTF::Function<bool (const StyleRuleBase&)>& handler) |
| { |
| for (auto& rule : rules) { |
| if (handler(*rule)) |
| return true; |
| switch (rule->type()) { |
| case StyleRuleBase::Media: { |
| auto* childRules = downcast<StyleRuleMedia>(*rule).childRulesWithoutDeferredParsing(); |
| if (childRules && traverseRulesInVector(*childRules, handler)) |
| return true; |
| break; |
| } |
| case StyleRuleBase::Import: |
| ASSERT_NOT_REACHED(); |
| break; |
| case StyleRuleBase::Style: |
| case StyleRuleBase::FontFace: |
| case StyleRuleBase::Page: |
| case StyleRuleBase::Keyframes: |
| case StyleRuleBase::Namespace: |
| case StyleRuleBase::Unknown: |
| case StyleRuleBase::Charset: |
| case StyleRuleBase::Keyframe: |
| case StyleRuleBase::Supports: |
| #if ENABLE(CSS_DEVICE_ADAPTATION) |
| case StyleRuleBase::Viewport: |
| #endif |
| break; |
| } |
| } |
| return false; |
| } |
| |
| bool StyleSheetContents::traverseRules(const WTF::Function<bool (const StyleRuleBase&)>& handler) const |
| { |
| for (auto& importRule : m_importRules) { |
| if (handler(*importRule)) |
| return true; |
| auto* importedStyleSheet = importRule->styleSheet(); |
| if (importedStyleSheet && importedStyleSheet->traverseRules(handler)) |
| return true; |
| } |
| return traverseRulesInVector(m_childRules, handler); |
| } |
| |
| bool StyleSheetContents::traverseSubresources(const WTF::Function<bool (const CachedResource&)>& handler) const |
| { |
| return traverseRules([&] (const StyleRuleBase& rule) { |
| switch (rule.type()) { |
| case StyleRuleBase::Style: { |
| auto* properties = downcast<StyleRule>(rule).propertiesWithoutDeferredParsing(); |
| return properties && properties->traverseSubresources(handler); |
| } |
| case StyleRuleBase::FontFace: |
| return downcast<StyleRuleFontFace>(rule).properties().traverseSubresources(handler); |
| case StyleRuleBase::Import: |
| if (auto* cachedResource = downcast<StyleRuleImport>(rule).cachedCSSStyleSheet()) |
| return handler(*cachedResource); |
| return false; |
| case StyleRuleBase::Media: |
| case StyleRuleBase::Page: |
| case StyleRuleBase::Keyframes: |
| case StyleRuleBase::Namespace: |
| case StyleRuleBase::Unknown: |
| case StyleRuleBase::Charset: |
| case StyleRuleBase::Keyframe: |
| case StyleRuleBase::Supports: |
| #if ENABLE(CSS_DEVICE_ADAPTATION) |
| case StyleRuleBase::Viewport: |
| #endif |
| return false; |
| }; |
| ASSERT_NOT_REACHED(); |
| return false; |
| }); |
| } |
| |
| bool StyleSheetContents::subresourcesAllowReuse(CachePolicy cachePolicy, FrameLoader& loader) const |
| { |
| bool hasFailedOrExpiredResources = traverseSubresources([cachePolicy, &loader](const CachedResource& resource) { |
| if (resource.loadFailedOrCanceled()) |
| return true; |
| // We can't revalidate subresources individually so don't use reuse the parsed sheet if they need revalidation. |
| if (resource.makeRevalidationDecision(cachePolicy) != CachedResource::RevalidationDecision::No) |
| return true; |
| |
| #if ENABLE(CONTENT_EXTENSIONS) |
| // If a cached subresource is blocked or made HTTPS by a content blocker, we cannot reuse the cached stylesheet. |
| auto* page = loader.frame().page(); |
| auto* documentLoader = loader.documentLoader(); |
| if (page && documentLoader) { |
| const auto& request = resource.resourceRequest(); |
| auto results = page->userContentProvider().processContentRuleListsForLoad(request.url(), ContentExtensions::toResourceType(resource.type()), *documentLoader); |
| if (results.summary.blockedLoad || results.summary.madeHTTPS) |
| return true; |
| } |
| #else |
| UNUSED_PARAM(loader); |
| #endif |
| |
| return false; |
| }); |
| return !hasFailedOrExpiredResources; |
| } |
| |
| bool StyleSheetContents::isLoadingSubresources() const |
| { |
| return traverseSubresources([](const CachedResource& resource) { |
| return resource.isLoading(); |
| }); |
| } |
| |
| StyleSheetContents* StyleSheetContents::parentStyleSheet() const |
| { |
| return m_ownerRule ? m_ownerRule->parentStyleSheet() : 0; |
| } |
| |
| void StyleSheetContents::registerClient(CSSStyleSheet* sheet) |
| { |
| ASSERT(!m_clients.contains(sheet)); |
| m_clients.append(sheet); |
| } |
| |
| void StyleSheetContents::unregisterClient(CSSStyleSheet* sheet) |
| { |
| bool removed = m_clients.removeFirst(sheet); |
| ASSERT_UNUSED(removed, removed); |
| } |
| |
| void StyleSheetContents::addedToMemoryCache() |
| { |
| ASSERT(isCacheable()); |
| ++m_inMemoryCacheCount; |
| } |
| |
| void StyleSheetContents::removedFromMemoryCache() |
| { |
| ASSERT(m_inMemoryCacheCount); |
| ASSERT(isCacheable()); |
| --m_inMemoryCacheCount; |
| } |
| |
| void StyleSheetContents::shrinkToFit() |
| { |
| m_importRules.shrinkToFit(); |
| m_childRules.shrinkToFit(); |
| } |
| |
| } |
