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/ResourceClientWalker.h"
31#include "platform/MIMETypeRegistry.h"
32#include "platform/SharedBuffer.h"
33#include "platform/network/HTTPParsers.h"
34
35namespace blink {
36
37ScriptResource::ScriptResource(const ResourceRequest& resourceRequest, const String& charset)
38    : TextResource(resourceRequest, Script, "application/javascript", charset)
39{
40    DEFINE_STATIC_LOCAL(const AtomicString, acceptScript, ("*/*", AtomicString::ConstructFromLiteral));
41
42    // It's javascript we want.
43    // But some websites think their scripts are <some wrong mimetype here>
44    // and refuse to serve them if we only accept application/x-javascript.
45    setAccept(acceptScript);
46}
47
48ScriptResource::~ScriptResource()
49{
50}
51
52void ScriptResource::didAddClient(ResourceClient* client)
53{
54    ASSERT(client->resourceClientType() == ScriptResourceClient::expectedType());
55    Resource::didAddClient(client);
56}
57
58void ScriptResource::appendData(const char* data, int length)
59{
60    Resource::appendData(data, length);
61    ResourceClientWalker<ScriptResourceClient> walker(m_clients);
62    while (ScriptResourceClient* client = walker.next())
63        client->notifyAppendData(this);
64}
65
66AtomicString ScriptResource::mimeType() const
67{
68    return extractMIMETypeFromMediaType(m_response.httpHeaderField("Content-Type")).lower();
69}
70
71const String& ScriptResource::script()
72{
73    ASSERT(!isPurgeable());
74    ASSERT(isLoaded());
75
76    if (!m_script && m_data) {
77        String script = decodedText();
78        m_data.clear();
79        // We lie a it here and claim that script counts as encoded data (even though it's really decoded data).
80        // That's because the MemoryCache thinks that it can clear out decoded data by calling destroyDecodedData(),
81        // but we can't destroy script in destroyDecodedData because that's our only copy of the data!
82        setEncodedSize(script.sizeInBytes());
83        m_script = AtomicString(script);
84    }
85
86    return m_script.string();
87}
88
89bool ScriptResource::mimeTypeAllowedByNosniff() const
90{
91    return parseContentTypeOptionsHeader(m_response.httpHeaderField("X-Content-Type-Options")) != ContentTypeOptionsNosniff || MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType());
92}
93
94} // namespace blink
95