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      1 /*
      2     Copyright (C) 1998 Lars Knoll (knoll (at) mpi-hd.mpg.de)
      3     Copyright (C) 2001 Dirk Mueller (mueller (at) kde.org)
      4     Copyright (C) 2002 Waldo Bastian (bastian (at) kde.org)
      5     Copyright (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com)
      6     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
      7 
      8     This library is free software; you can redistribute it and/or
      9     modify it under the terms of the GNU Library General Public
     10     License as published by the Free Software Foundation; either
     11     version 2 of the License, or (at your option) any later version.
     12 
     13     This library is distributed in the hope that it will be useful,
     14     but WITHOUT ANY WARRANTY; without even the implied warranty of
     15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16     Library General Public License for more details.
     17 
     18     You should have received a copy of the GNU Library General Public License
     19     along with this library; see the file COPYING.LIB.  If not, write to
     20     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21     Boston, MA 02110-1301, USA.
     22 
     23     This class provides all functionality needed for loading images, style sheets and html
     24     pages from the web. It has a memory cache for these objects.
     25 */
     26 
     27 #include "config.h"
     28 #include "core/loader/cache/ScriptResource.h"
     29 
     30 #include "core/loader/TextResourceDecoder.h"
     31 #include "core/platform/MIMETypeRegistry.h"
     32 #include "core/platform/SharedBuffer.h"
     33 #include "core/platform/network/HTTPParsers.h"
     34 
     35 namespace WebCore {
     36 
     37 ScriptResource::ScriptResource(const ResourceRequest& resourceRequest, const String& charset)
     38     : Resource(resourceRequest, Script)
     39     , m_decoder(TextResourceDecoder::create("application/javascript", charset))
     40 {
     41     DEFINE_STATIC_LOCAL(const AtomicString, acceptScript, ("*/*", AtomicString::ConstructFromLiteral));
     42 
     43     // It's javascript we want.
     44     // But some websites think their scripts are <some wrong mimetype here>
     45     // and refuse to serve them if we only accept application/x-javascript.
     46     setAccept(acceptScript);
     47 }
     48 
     49 ScriptResource::~ScriptResource()
     50 {
     51 }
     52 
     53 void ScriptResource::setEncoding(const String& chs)
     54 {
     55     m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
     56 }
     57 
     58 String ScriptResource::encoding() const
     59 {
     60     return m_decoder->encoding().name();
     61 }
     62 
     63 String ScriptResource::mimeType() const
     64 {
     65     return extractMIMETypeFromMediaType(m_response.httpHeaderField("Content-Type")).lower();
     66 }
     67 
     68 const String& ScriptResource::script()
     69 {
     70     ASSERT(!isPurgeable());
     71     ASSERT(isLoaded());
     72 
     73     if (!m_script && m_data) {
     74         String script = m_decoder->decode(m_data->data(), encodedSize());
     75         script.append(m_decoder->flush());
     76         m_data.clear();
     77         // We lie a it here and claim that script counts as encoded data (even though it's really decoded data).
     78         // That's because the MemoryCache thinks that it can clear out decoded data by calling destroyDecodedData(),
     79         // but we can't destroy script in destroyDecodedData because that's our only copy of the data!
     80         setEncodedSize(script.sizeInBytes());
     81         m_script = script;
     82     }
     83 
     84     return m_script.string();
     85 }
     86 
     87 bool ScriptResource::mimeTypeAllowedByNosniff() const
     88 {
     89     return parseContentTypeOptionsHeader(m_response.httpHeaderField("X-Content-Type-Options")) != ContentTypeOptionsNosniff || MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType());
     90 }
     91 
     92 } // namespace WebCore
     93