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/*
Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
Copyright (C) 2004-2025 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.
This class provides all functionality needed for loading images, style sheets and html
pages from the web. It has a memory cache for these objects.
*/
#include "config.h"
#include "CachedScript.h"
#include "CachedResourceClient.h"
#include "CachedResourceRequest.h"
#include "SharedBuffer.h"
#include "TextResourceDecoder.h"
#if PLATFORM(MAC)
#include <wtf/cocoa/RuntimeApplicationChecksCocoa.h>
#endif
namespace WebCore {
CachedScript::CachedScript(CachedResourceRequest&& request, PAL::SessionID sessionID, const CookieJar* cookieJar, ScriptTrackingPrivacyProtectionsEnabled requiresPrivacyProtections)
: CachedResource(WTFMove(request), Type::Script, sessionID, cookieJar)
, m_requiresPrivacyProtections(requiresPrivacyProtections == ScriptTrackingPrivacyProtectionsEnabled::Yes)
, m_decoder(TextResourceDecoder::create("text/javascript"_s, request.charset()))
{
}
CachedScript::~CachedScript() = default;
RefPtr<TextResourceDecoder> CachedScript::protectedDecoder() const
{
return m_decoder;
}
void CachedScript::setEncoding(const String& chs)
{
protectedDecoder()->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
}
ASCIILiteral CachedScript::encoding() const
{
return protectedDecoder()->encoding().name();
}
StringView CachedScript::script(ShouldDecodeAsUTF8Only shouldDecodeAsUTF8Only)
{
if (!m_data)
return emptyString();
if (RefPtr data = m_data; !data->isContiguous())
m_data = data->makeContiguous();
Ref contiguousData = downcast<SharedBuffer>(*m_data);
if (m_decodingState == NeverDecoded
&& PAL::TextEncoding(encoding()).isByteBasedEncoding()
&& contiguousData->size()
&& charactersAreAllASCII(contiguousData->span())) {
{
Locker locker { m_lock };
m_decodingState = DataAndDecodedStringHaveSameBytes;
}
// If the encoded and decoded data are the same, there is no decoded data cost!
setDecodedSize(0);
stopDecodedDataDeletionTimer();
m_scriptHash = StringHasher::computeHashAndMaskTop8Bits(contiguousData->span());
}
if (m_decodingState == DataAndDecodedStringHaveSameBytes)
return { contiguousData->span() };
bool shouldForceRedecoding = m_wasForceDecodedAsUTF8 != (shouldDecodeAsUTF8Only == ShouldDecodeAsUTF8Only::Yes);
if (!m_script || shouldForceRedecoding) {
ASSERT(contiguousData->span().size() == encodedSize());
String result;
if (shouldDecodeAsUTF8Only == ShouldDecodeAsUTF8Only::Yes) {
Ref forceUTF8Decoder = TextResourceDecoder::create("text/javascript"_s, PAL::UTF8Encoding());
forceUTF8Decoder->setAlwaysUseUTF8();
result = forceUTF8Decoder->decodeAndFlush(contiguousData->span());
} else
result = protectedDecoder()->decodeAndFlush(contiguousData->span());
if (m_decodingState == NeverDecoded || shouldForceRedecoding)
m_scriptHash = result.hash();
ASSERT(!m_scriptHash || m_scriptHash == result.hash());
{
Locker locker { m_lock };
m_script = WTFMove(result);
m_decodingState = DataAndDecodedStringHaveDifferentBytes;
m_wasForceDecodedAsUTF8 = shouldDecodeAsUTF8Only == ShouldDecodeAsUTF8Only::Yes;
}
setDecodedSize(m_script.sizeInBytes());
}
restartDecodedDataDeletionTimer();
return m_script;
}
JSC::CodeBlockHash CachedScript::codeBlockHashConcurrently(int startOffset, int endOffset, JSC::CodeSpecializationKind kind, ShouldDecodeAsUTF8Only shouldDecodeAsUTF8Only)
{
Locker locker { m_lock };
auto data = m_data;
if (!data)
return JSC::CodeBlockHash { emptyString(), emptyString(), kind };
switch (m_decodingState) {
case NeverDecoded: {
// This is rare, but unfortunately, when running CodeBlockHash concurrently, CachedScript was not decoding the source code.
// Thus, we need to decode them and need to compute. This is costly, but fine as CodeBlockHash is only used for debugging.
if (!data->isContiguous())
data = data->makeContiguous();
Ref contiguousData = downcast<SharedBuffer>(*data);
if (PAL::TextEncoding(encoding()).isByteBasedEncoding() && contiguousData->size() && charactersAreAllASCII(contiguousData->span())) {
StringView entireSource { contiguousData->span() };
return JSC::CodeBlockHash { entireSource.substring(startOffset, endOffset - startOffset), entireSource, kind };
}
String result;
if (shouldDecodeAsUTF8Only == ShouldDecodeAsUTF8Only::Yes) {
Ref forceUTF8Decoder = TextResourceDecoder::create("text/javascript"_s, PAL::UTF8Encoding());
forceUTF8Decoder->setAlwaysUseUTF8();
result = forceUTF8Decoder->decodeAndFlush(contiguousData->span());
} else {
auto decoder = TextResourceDecoder::create(protectedDecoder()->contentType(), protectedDecoder()->encoding(), protectedDecoder()->usesEncodingDetector());
result = decoder->decodeAndFlush(contiguousData->span());
}
StringView entireSource { result };
return JSC::CodeBlockHash { entireSource.substring(startOffset, endOffset - startOffset), entireSource, kind };
}
case DataAndDecodedStringHaveSameBytes: {
StringView entireSource { downcast<SharedBuffer>(*data).span() };
return JSC::CodeBlockHash { entireSource.substring(startOffset, endOffset - startOffset), entireSource, kind };
}
case DataAndDecodedStringHaveDifferentBytes: {
StringView entireSource { m_script };
return JSC::CodeBlockHash { entireSource.substring(startOffset, endOffset - startOffset), entireSource, kind };
}
}
return { };
}
unsigned CachedScript::scriptHash(ShouldDecodeAsUTF8Only shouldDecodeAsUTF8Only)
{
if (m_decodingState == NeverDecoded || (m_decodingState == DataAndDecodedStringHaveDifferentBytes && m_wasForceDecodedAsUTF8 != (shouldDecodeAsUTF8Only == ShouldDecodeAsUTF8Only::Yes)))
script(shouldDecodeAsUTF8Only);
return m_scriptHash;
}
void CachedScript::finishLoading(const FragmentedSharedBuffer* data, const NetworkLoadMetrics& metrics)
{
if (data) {
m_data = data->makeContiguous();
setEncodedSize(data->size());
} else {
m_data = nullptr;
setEncodedSize(0);
}
CachedResource::finishLoading(data, metrics);
}
void CachedScript::destroyDecodedData()
{
{
Locker locker { m_lock };
m_script = String();
}
setDecodedSize(0);
}
void CachedScript::setBodyDataFrom(const CachedResource& resource)
{
ASSERT(resource.type() == type());
auto& script = downcast<const CachedScript>(resource);
CachedResource::setBodyDataFrom(resource);
{
Locker locker { m_lock };
m_script = script.m_script;
m_scriptHash = script.m_scriptHash;
m_wasForceDecodedAsUTF8 = script.m_wasForceDecodedAsUTF8;
m_decodingState = script.m_decodingState;
m_decoder = script.m_decoder;
}
}
} // namespace WebCore
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