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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, 2005, 2006, 2007, 2008 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 "CachedResourceClientWalker.h"
#include "HTTPHeaderNames.h"
#include "HTTPParsers.h"
#include "MIMETypeRegistry.h"
#include "MemoryCache.h"
#include "RuntimeApplicationChecks.h"
#include "SharedBuffer.h"
#include "TextResourceDecoder.h"
#include <wtf/Vector.h>
namespace WebCore {
CachedScript::CachedScript(const ResourceRequest& resourceRequest, const String& charset, SessionID sessionID)
: CachedResource(resourceRequest, Script, sessionID)
, m_decoder(TextResourceDecoder::create(ASCIILiteral("application/javascript"), charset))
{
// It's javascript we want.
// But some websites think their scripts are <some wrong mimetype here>
// and refuse to serve them if we only accept application/x-javascript.
setAccept("*/*");
}
CachedScript::~CachedScript()
{
}
void CachedScript::setEncoding(const String& chs)
{
m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
}
String CachedScript::encoding() const
{
return m_decoder->encoding().name();
}
String CachedScript::mimeType() const
{
return extractMIMETypeFromMediaType(m_response.httpHeaderField(HTTPHeaderName::ContentType)).convertToASCIILowercase();
}
StringView CachedScript::script()
{
if (!m_data)
return { };
if (m_decodingState == NeverDecoded
&& TextEncoding(encoding()).isByteBasedEncoding()
&& m_data->size()
&& charactersAreAllASCII(reinterpret_cast<const LChar*>(m_data->data()), m_data->size())) {
m_decodingState = DataAndDecodedStringHaveSameBytes;
// If the encoded and decoded data are the same, there is no decoded data cost!
setDecodedSize(0);
m_decodedDataDeletionTimer.stop();
m_scriptHash = StringHasher::computeHashAndMaskTop8Bits(reinterpret_cast<const LChar*>(m_data->data()), m_data->size());
}
if (m_decodingState == DataAndDecodedStringHaveSameBytes)
return { reinterpret_cast<const LChar*>(m_data->data()), m_data->size() };
if (!m_script) {
m_script = m_decoder->decodeAndFlush(m_data->data(), encodedSize());
m_scriptHash = m_script.impl()->hash();
m_decodingState = DataAndDecodedStringHaveDifferentBytes;
setDecodedSize(m_script.sizeInBytes());
}
m_decodedDataDeletionTimer.restart();
return m_script;
}
unsigned CachedScript::scriptHash()
{
if (m_decodingState == NeverDecoded)
script();
return m_scriptHash;
}
void CachedScript::finishLoading(SharedBuffer* data)
{
m_data = data;
setEncodedSize(data ? data->size() : 0);
CachedResource::finishLoading(data);
}
void CachedScript::destroyDecodedData()
{
m_script = String();
setDecodedSize(0);
}
#if ENABLE(NOSNIFF)
bool CachedScript::mimeTypeAllowedByNosniff() const
{
return parseContentTypeOptionsHeader(m_response.httpHeaderField(HTTPHeaderName::XContentTypeOptions)) != ContentTypeOptionsNosniff || MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType());
}
#endif
bool CachedScript::shouldIgnoreHTTPStatusCodeErrors() const
{
// This is a workaround for <rdar://problem/13916291>
// REGRESSION (r119759): Adobe Flash Player "smaller" installer relies on the incorrect firing
// of a load event and needs an app-specific hack for compatibility.
// The installer in question tries to load .js file that doesn't exist, causing the server to
// return a 404 response. Normally, this would trigger an error event to be dispatched, but the
// installer expects a load event instead so we work around it here.
if (applicationIsSolidStateNetworksDownloader())
return true;
return CachedResource::shouldIgnoreHTTPStatusCodeErrors();
}
} // namespace WebCore
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