1 /*
2  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
3  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
4  * Copyright (C) 2002, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public License
17  * along with this library; see the file COPYING.LIB.  If not, write to
18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19  * Boston, MA 02110-1301, USA.
20  */
21 
22 #include "config.h"
23 #include "CSSImportRule.h"
24 
25 #include "CachedCSSStyleSheet.h"
26 #include "CachedResourceLoader.h"
27 #include "Document.h"
28 #include "SecurityOrigin.h"
29 #include "Settings.h"
30 #include <wtf/StdLibExtras.h>
31 
32 namespace WebCore {
33 
CSSImportRule(CSSStyleSheet * parent,const String & href,PassRefPtr<MediaList> media)34 CSSImportRule::CSSImportRule(CSSStyleSheet* parent, const String& href, PassRefPtr<MediaList> media)
35     : CSSRule(parent)
36     , m_strHref(href)
37     , m_lstMedia(media)
38     , m_cachedSheet(0)
39     , m_loading(false)
40 {
41     if (m_lstMedia)
42         m_lstMedia->setParent(this);
43     else
44         m_lstMedia = MediaList::create(this, String());
45 }
46 
~CSSImportRule()47 CSSImportRule::~CSSImportRule()
48 {
49     if (m_lstMedia)
50         m_lstMedia->setParent(0);
51     if (m_styleSheet)
52         m_styleSheet->setParent(0);
53     if (m_cachedSheet)
54         m_cachedSheet->removeClient(this);
55 }
56 
setCSSStyleSheet(const String & href,const KURL & baseURL,const String & charset,const CachedCSSStyleSheet * sheet)57 void CSSImportRule::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CachedCSSStyleSheet* sheet)
58 {
59     if (m_styleSheet)
60         m_styleSheet->setParent(0);
61     m_styleSheet = CSSStyleSheet::create(this, href, baseURL, charset);
62 
63     bool crossOriginCSS = false;
64     bool validMIMEType = false;
65     CSSStyleSheet* parent = parentStyleSheet();
66     bool strict = !parent || parent->useStrictParsing();
67     bool enforceMIMEType = strict;
68     bool needsSiteSpecificQuirks = parent && parent->document() && parent->document()->settings() && parent->document()->settings()->needsSiteSpecificQuirks();
69 
70 #ifdef BUILDING_ON_LEOPARD
71     if (enforceMIMEType && needsSiteSpecificQuirks) {
72         // Covers both http and https, with or without "www."
73         if (baseURL.string().contains("mcafee.com/japan/", false))
74             enforceMIMEType = false;
75     }
76 #endif
77 
78     String sheetText = sheet->sheetText(enforceMIMEType, &validMIMEType);
79     m_styleSheet->parseString(sheetText, strict);
80 
81     if (!parent || !parent->document() || !parent->document()->securityOrigin()->canRequest(baseURL))
82         crossOriginCSS = true;
83 
84     if (crossOriginCSS && !validMIMEType && !m_styleSheet->hasSyntacticallyValidCSSHeader())
85         m_styleSheet = CSSStyleSheet::create(this, href, baseURL, charset);
86 
87     if (strict && needsSiteSpecificQuirks) {
88         // Work around <https://bugs.webkit.org/show_bug.cgi?id=28350>.
89         DEFINE_STATIC_LOCAL(const String, slashKHTMLFixesDotCss, ("/KHTMLFixes.css"));
90         DEFINE_STATIC_LOCAL(const String, mediaWikiKHTMLFixesStyleSheet, ("/* KHTML fix stylesheet */\n/* work around the horizontal scrollbars */\n#column-content { margin-left: 0; }\n\n"));
91         // There are two variants of KHTMLFixes.css. One is equal to mediaWikiKHTMLFixesStyleSheet,
92         // while the other lacks the second trailing newline.
93         if (baseURL.string().endsWith(slashKHTMLFixesDotCss) && !sheetText.isNull() && mediaWikiKHTMLFixesStyleSheet.startsWith(sheetText)
94                 && sheetText.length() >= mediaWikiKHTMLFixesStyleSheet.length() - 1) {
95             ASSERT(m_styleSheet->length() == 1);
96             ExceptionCode ec;
97             m_styleSheet->deleteRule(0, ec);
98         }
99     }
100 
101     m_loading = false;
102 
103     if (parent)
104         parent->checkLoaded();
105 }
106 
isLoading() const107 bool CSSImportRule::isLoading() const
108 {
109     return m_loading || (m_styleSheet && m_styleSheet->isLoading());
110 }
111 
insertedIntoParent()112 void CSSImportRule::insertedIntoParent()
113 {
114     CSSStyleSheet* parentSheet = parentStyleSheet();
115     if (!parentSheet || !parentSheet->document())
116         return;
117 
118     CachedResourceLoader* cachedResourceLoader = parentSheet->document()->cachedResourceLoader();
119     if (!cachedResourceLoader)
120         return;
121 
122     String absHref = m_strHref;
123     if (!parentSheet->finalURL().isNull())
124         // use parent styleheet's URL as the base URL
125         absHref = KURL(parentSheet->finalURL(), m_strHref).string();
126 
127     // Check for a cycle in our import chain.  If we encounter a stylesheet
128     // in our parent chain with the same URL, then just bail.
129     StyleBase* root = this;
130     for (StyleBase* curr = parent(); curr; curr = curr->parent()) {
131         // FIXME: This is wrong if the finalURL was updated via document::updateBaseURL.
132         if (curr->isCSSStyleSheet() && absHref == static_cast<CSSStyleSheet*>(curr)->finalURL().string())
133             return;
134         root = curr;
135     }
136 
137     if (parentSheet->isUserStyleSheet())
138         m_cachedSheet = cachedResourceLoader->requestUserCSSStyleSheet(absHref, parentSheet->charset());
139     else
140         m_cachedSheet = cachedResourceLoader->requestCSSStyleSheet(absHref, parentSheet->charset());
141     if (m_cachedSheet) {
142         // if the import rule is issued dynamically, the sheet may be
143         // removed from the pending sheet count, so let the doc know
144         // the sheet being imported is pending.
145         if (parentSheet && parentSheet->loadCompleted() && root == parentSheet)
146             parentSheet->document()->addPendingSheet();
147         m_loading = true;
148         m_cachedSheet->addClient(this);
149     }
150 }
151 
cssText() const152 String CSSImportRule::cssText() const
153 {
154     String result = "@import url(\"";
155     result += m_strHref;
156     result += "\")";
157 
158     if (m_lstMedia) {
159         result += " ";
160         result += m_lstMedia->mediaText();
161     }
162     result += ";";
163 
164     return result;
165 }
166 
addSubresourceStyleURLs(ListHashSet<KURL> & urls)167 void CSSImportRule::addSubresourceStyleURLs(ListHashSet<KURL>& urls)
168 {
169     if (m_styleSheet)
170         addSubresourceURL(urls, m_styleSheet->baseURL());
171 }
172 
173 } // namespace WebCore
174