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/*
* Copyright (C) 2015-2021 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 "CSSParserContext.h"
#include "CompiledContentExtension.h"
#include "ContentExtensionParser.h"
#include "ContentExtensionsBackend.h"
#include "StyleSheetContents.h"
#include <wtf/text/StringBuilder.h>
#if ENABLE(CONTENT_EXTENSIONS)
namespace WebCore::ContentExtensions {
Ref<ContentExtension> ContentExtension::create(const String& identifier, Ref<CompiledContentExtension>&& compiledExtension, URL&& extensionBaseURL, ShouldCompileCSS shouldCompileCSS)
{
return adoptRef(*new ContentExtension(identifier, WTFMove(compiledExtension), WTFMove(extensionBaseURL), shouldCompileCSS));
}
ContentExtension::ContentExtension(const String& identifier, Ref<CompiledContentExtension>&& compiledExtension, URL&& extensionBaseURL, ShouldCompileCSS shouldCompileCSS)
: m_identifier(identifier)
, m_compiledExtension(WTFMove(compiledExtension))
, m_extensionBaseURL(WTFMove(extensionBaseURL))
{
DFABytecodeInterpreter interpreter(m_compiledExtension->urlFiltersBytecode());
m_universalActions = copyToVector(interpreter.actionsMatchingEverything());
if (shouldCompileCSS == ShouldCompileCSS::Yes)
compileGlobalDisplayNoneStyleSheet();
m_universalActions.shrinkToFit();
}
uint32_t ContentExtension::findFirstIgnorePreviousRules() const
{
auto serializedActions = m_compiledExtension->serializedActions();
uint32_t currentActionIndex = 0;
while (currentActionIndex < serializedActions.size()) {
if (serializedActions[currentActionIndex] == WTF::alternativeIndexV<IgnorePreviousRulesAction, ActionData>)
return currentActionIndex;
currentActionIndex += DeserializedAction::serializedLength(serializedActions, currentActionIndex);
}
return std::numeric_limits<uint32_t>::max();
}
StyleSheetContents* ContentExtension::globalDisplayNoneStyleSheet()
{
return m_globalDisplayNoneStyleSheet.get();
}
void ContentExtension::compileGlobalDisplayNoneStyleSheet()
{
uint32_t firstIgnorePreviousRules = findFirstIgnorePreviousRules();
auto serializedActions = m_compiledExtension->serializedActions();
auto inGlobalDisplayNoneStyleSheet = [&](const uint32_t location) {
RELEASE_ASSERT(location < serializedActions.size());
return location < firstIgnorePreviousRules && serializedActions[location] == WTF::alternativeIndexV<CSSDisplayNoneSelectorAction, ActionData>;
};
StringBuilder css;
for (uint64_t universalActionLocation : m_universalActions) {
if (inGlobalDisplayNoneStyleSheet(universalActionLocation)) {
if (!css.isEmpty())
css.append(',');
auto action = DeserializedAction::deserialize(serializedActions, universalActionLocation);
ASSERT(std::holds_alternative<CSSDisplayNoneSelectorAction>(action.data()));
if (auto* actionData = std::get_if<CSSDisplayNoneSelectorAction>(&action.data()))
css.append(actionData->string);
}
}
if (css.isEmpty())
return;
css.append('{');
css.append(ContentExtensionsBackend::displayNoneCSSRule());
css.append('}');
m_globalDisplayNoneStyleSheet = StyleSheetContents::create(contentExtensionCSSParserContext());
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_universalActions.removeAllMatching(inGlobalDisplayNoneStyleSheet);
}
void ContentExtension::populateTopURLActionCacheIfNeeded(const URL& topURL) const
{
if (m_cachedTopURL == topURL)
return;
DFABytecodeInterpreter interpreter(m_compiledExtension->topURLFiltersBytecode());
auto topURLActions = interpreter.interpret(topURL.string(), AllResourceFlags);
m_cachedTopURLActions.clear();
for (uint64_t action : topURLActions)
m_cachedTopURLActions.add(action);
for (uint64_t action : interpreter.actionsMatchingEverything())
m_cachedTopURLActions.add(action);
m_cachedTopURL = topURL;
}
void ContentExtension::populateFrameURLActionCacheIfNeeded(const URL& frameURL) const
{
if (m_cachedFrameURL == frameURL)
return;
DFABytecodeInterpreter interpreter(m_compiledExtension->frameURLFiltersBytecode());
auto frameURLActions = interpreter.interpret(frameURL.string(), AllResourceFlags);
m_cachedFrameURLActions.clear();
for (uint64_t action : frameURLActions)
m_cachedFrameURLActions.add(action);
for (uint64_t action : interpreter.actionsMatchingEverything())
m_cachedFrameURLActions.add(action);
m_cachedFrameURL = frameURL;
}
const DFABytecodeInterpreter::Actions& ContentExtension::topURLActions(const URL& topURL) const
{
populateTopURLActionCacheIfNeeded(topURL);
return m_cachedTopURLActions;
}
const DFABytecodeInterpreter::Actions& ContentExtension::frameURLActions(const URL& frameURL) const
{
populateFrameURLActionCacheIfNeeded(frameURL);
return m_cachedFrameURLActions;
}
} // namespace WebCore::ContentExtensions
#endif // ENABLE(CONTENT_EXTENSIONS)
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