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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ContentExtension.h"
#include "CompiledContentExtension.h"
#include "ContentExtensionsBackend.h"
#include "StyleSheetContents.h"
#include <wtf/text/StringBuilder.h>
#if ENABLE(CONTENT_EXTENSIONS)
namespace WebCore {
namespace ContentExtensions {
Ref<ContentExtension> ContentExtension::create(const String& identifier, Ref<CompiledContentExtension>&& compiledExtension)
{
return adoptRef(*new ContentExtension(identifier, WTFMove(compiledExtension)));
}
ContentExtension::ContentExtension(const String& identifier, Ref<CompiledContentExtension>&& compiledExtension)
: m_identifier(identifier)
, m_compiledExtension(WTFMove(compiledExtension))
{
DFABytecodeInterpreter withoutConditions(m_compiledExtension->filtersWithoutConditionsBytecode(), m_compiledExtension->filtersWithoutConditionsBytecodeLength());
DFABytecodeInterpreter withConditions(m_compiledExtension->filtersWithConditionsBytecode(), m_compiledExtension->filtersWithConditionsBytecodeLength());
for (uint64_t action : withoutConditions.actionsMatchingEverything()) {
ASSERT(static_cast<uint32_t>(action) == action);
m_universalActionsWithoutConditions.append(static_cast<uint32_t>(action));
}
for (uint64_t action : withConditions.actionsMatchingEverything()) {
ASSERT((action & ~IfConditionFlag) == static_cast<uint32_t>(action));
m_universalActionsWithConditions.append(action);
}
compileGlobalDisplayNoneStyleSheet();
m_universalActionsWithoutConditions.shrinkToFit();
m_universalActionsWithConditions.shrinkToFit();
}
uint32_t ContentExtension::findFirstIgnorePreviousRules() const
{
auto* actions = m_compiledExtension->actions();
uint32_t actionsLength = m_compiledExtension->actionsLength();
uint32_t currentActionIndex = 0;
while (currentActionIndex < actionsLength) {
if (Action::deserializeType(actions, actionsLength, currentActionIndex) == ActionType::IgnorePreviousRules)
return currentActionIndex;
currentActionIndex += Action::serializedLength(actions, actionsLength, currentActionIndex);
}
return std::numeric_limits<uint32_t>::max();
}
StyleSheetContents* ContentExtension::globalDisplayNoneStyleSheet()
{
return m_globalDisplayNoneStyleSheet.get();
}
void ContentExtension::compileGlobalDisplayNoneStyleSheet()
{
uint32_t firstIgnorePreviousRules = findFirstIgnorePreviousRules();
auto* actions = m_compiledExtension->actions();
uint32_t actionsLength = m_compiledExtension->actionsLength();
auto inGlobalDisplayNoneStyleSheet = [&](const uint32_t location)
{
return location < firstIgnorePreviousRules && Action::deserializeType(actions, actionsLength, location) == ActionType::CSSDisplayNoneSelector;
};
StringBuilder css;
for (uint32_t universalActionLocation : m_universalActionsWithoutConditions) {
if (inGlobalDisplayNoneStyleSheet(universalActionLocation)) {
if (!css.isEmpty())
css.append(',');
Action action = Action::deserialize(actions, actionsLength, universalActionLocation);
ASSERT(action.type() == ActionType::CSSDisplayNoneSelector);
css.append(action.stringArgument());
}
}
if (css.isEmpty())
return;
css.append('{');
css.append(ContentExtensionsBackend::displayNoneCSSRule());
css.append('}');
m_globalDisplayNoneStyleSheet = StyleSheetContents::create();
m_globalDisplayNoneStyleSheet->setIsUserStyleSheet(true);
if (!m_globalDisplayNoneStyleSheet->parseString(css.toString()))
m_globalDisplayNoneStyleSheet = nullptr;
// These actions don't need to be applied individually any more. They will all be applied to every page as a precompiled style sheet.
m_universalActionsWithoutConditions.removeAllMatching(inGlobalDisplayNoneStyleSheet);
}
void ContentExtension::populateConditionCacheIfNeeded(const URL& topURL)
{
if (m_cachedTopURL != topURL) {
DFABytecodeInterpreter interpreter(m_compiledExtension->topURLFiltersBytecode(), m_compiledExtension->topURLFiltersBytecodeLength());
const uint16_t allLoadTypesAndResourceTypes = LoadTypeMask | ResourceTypeMask;
String string = m_compiledExtension->conditionsApplyOnlyToDomain() ? topURL.host() : topURL.string();
auto topURLActions = interpreter.interpret(string.utf8(), allLoadTypesAndResourceTypes);
m_cachedTopURLActions.clear();
for (uint64_t action : topURLActions)
m_cachedTopURLActions.add(action);
for (uint64_t action : interpreter.actionsMatchingEverything())
m_cachedTopURLActions.add(action);
m_cachedUniversalConditionedActions.clear();
for (uint64_t action : m_universalActionsWithConditions) {
ASSERT_WITH_MESSAGE((action & ~IfConditionFlag) == static_cast<uint32_t>(action), "Universal actions with conditions should not have flags.");
if (!!(action & IfConditionFlag) == m_cachedTopURLActions.contains(action))
m_cachedUniversalConditionedActions.append(static_cast<uint32_t>(action));
}
m_cachedUniversalConditionedActions.shrinkToFit();
m_cachedTopURL = topURL;
}
}
const DFABytecodeInterpreter::Actions& ContentExtension::topURLActions(const URL& topURL)
{
populateConditionCacheIfNeeded(topURL);
return m_cachedTopURLActions;
}
const Vector<uint32_t>& ContentExtension::universalActionsWithConditions(const URL& topURL)
{
populateConditionCacheIfNeeded(topURL);
return m_cachedUniversalConditionedActions;
}
} // namespace ContentExtensions
} // namespace WebCore
#endif // ENABLE(CONTENT_EXTENSIONS)
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