third_party/WebKit/Source/core/fetch/ScriptResource.cpp

   1 /*
   2     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
   3     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
   4     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
   5     Copyright (C) 2006 Samuel Weinig (sam.weinig@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/fetch/ScriptResource.h"
  29
  30 #include "core/fetch/FetchRequest.h"
  31 #include "core/fetch/ResourceClientWalker.h"
  32 #include "core/fetch/ResourceFetcher.h"
  33 #include "platform/MIMETypeRegistry.h"
  34 #include "platform/SharedBuffer.h"
  35 #include "platform/network/HTTPParsers.h"
  36
  37 namespace blink {
  38
  39 ResourcePtr<ScriptResource> ScriptResource::fetch(FetchRequest& request, ResourceFetcher* fetcher)
  40 {
  41     ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
  42     request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextScript);
  43     return toScriptResource(fetcher->requestResource(request, ScriptResourceFactory()));
  44 }
  45
  46 ScriptResource::ScriptResource(const ResourceRequest& resourceRequest, const String& charset)
  47     : TextResource(resourceRequest, Script, "application/javascript", charset)
  48 {
  49     DEFINE_STATIC_LOCAL(const AtomicString, acceptScript, ("*/*", AtomicString::ConstructFromLiteral));
  50
  51     // It's javascript we want.
  52     // But some websites think their scripts are <some wrong mimetype here>
  53     // and refuse to serve them if we only accept application/x-javascript.
  54     setAccept(acceptScript);
  55 }
  56
  57 ScriptResource::~ScriptResource()
  58 {
  59 }
  60
  61 void ScriptResource::didAddClient(ResourceClient* client)
  62 {
  63     ASSERT(client->resourceClientType() == ScriptResourceClient::expectedType());
  64     Resource::didAddClient(client);
  65 }
  66
  67 void ScriptResource::appendData(const char* data, unsigned length)
  68 {
  69     Resource::appendData(data, length);
  70     ResourceClientWalker<ScriptResourceClient> walker(m_clients);
  71     while (ScriptResourceClient* client = walker.next())
  72         client->notifyAppendData(this);
  73 }
  74
  75 AtomicString ScriptResource::mimeType() const
  76 {
  77     return extractMIMETypeFromMediaType(m_response.httpHeaderField("Content-Type")).lower();
  78 }
  79
  80 const String& ScriptResource::script()
  81 {
  82     ASSERT(!isPurgeable());
  83     ASSERT(isLoaded());
  84
  85     if (!m_script && m_data) {
  86         String script = decodedText();
  87         m_data.clear();
  88         // We lie a it here and claim that script counts as encoded data (even though it's really decoded data).
  89         // That's because the MemoryCache thinks that it can clear out decoded data by calling destroyDecodedData(),
  90         // but we can't destroy script in destroyDecodedData because that's our only copy of the data!
  91         setEncodedSize(script.sizeInBytes());
  92         m_script = AtomicString(script);
  93     }
  94
  95     return m_script.string();
  96 }
  97
  98 bool ScriptResource::mimeTypeAllowedByNosniff() const
  99 {
 100     return parseContentTypeOptionsHeader(m_response.httpHeaderField("X-Content-Type-Options")) != ContentTypeOptionsNosniff || MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType());
 101 }
 102
 103 } // namespace blink