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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * (C) 2002-2003 Dirk Mueller (mueller (at) kde.org)
      4  * Copyright (C) 2002, 2005, 2006, 2008, 2009, 2010, 2012 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 "core/css/StyleRuleImport.h"
     24 
     25 #include "core/FetchInitiatorTypeNames.h"
     26 #include "core/css/StyleSheetContents.h"
     27 #include "core/dom/Document.h"
     28 #include "core/fetch/CSSStyleSheetResource.h"
     29 #include "core/fetch/FetchRequest.h"
     30 #include "core/fetch/ResourceFetcher.h"
     31 
     32 namespace WebCore {
     33 
     34 PassRefPtrWillBeRawPtr<StyleRuleImport> StyleRuleImport::create(const String& href, PassRefPtrWillBeRawPtr<MediaQuerySet> media)
     35 {
     36     return adoptRefWillBeNoop(new StyleRuleImport(href, media));
     37 }
     38 
     39 StyleRuleImport::StyleRuleImport(const String& href, PassRefPtrWillBeRawPtr<MediaQuerySet> media)
     40     : StyleRuleBase(Import)
     41     , m_parentStyleSheet(nullptr)
     42     , m_styleSheetClient(this)
     43     , m_strHref(href)
     44     , m_mediaQueries(media)
     45     , m_resource(0)
     46     , m_loading(false)
     47 {
     48     if (!m_mediaQueries)
     49         m_mediaQueries = MediaQuerySet::create(String());
     50 }
     51 
     52 StyleRuleImport::~StyleRuleImport()
     53 {
     54 #if !ENABLE(OILPAN)
     55     if (m_styleSheet)
     56         m_styleSheet->clearOwnerRule();
     57 #endif
     58     if (m_resource)
     59         m_resource->removeClient(&m_styleSheetClient);
     60 }
     61 
     62 void StyleRuleImport::traceAfterDispatch(Visitor* visitor)
     63 {
     64     visitor->trace(m_parentStyleSheet);
     65     visitor->trace(m_mediaQueries);
     66     visitor->trace(m_styleSheet);
     67     StyleRuleBase::traceAfterDispatch(visitor);
     68 }
     69 
     70 void StyleRuleImport::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource* cachedStyleSheet)
     71 {
     72     if (m_styleSheet)
     73         m_styleSheet->clearOwnerRule();
     74 
     75     CSSParserContext context = m_parentStyleSheet ? m_parentStyleSheet->parserContext() : strictCSSParserContext();
     76     context.setCharset(charset);
     77     Document* document = m_parentStyleSheet ? m_parentStyleSheet->singleOwnerDocument() : 0;
     78     if (!baseURL.isNull()) {
     79         context.setBaseURL(baseURL);
     80         if (document)
     81             context.setReferrer(Referrer(baseURL.strippedForUseAsReferrer(), document->referrerPolicy()));
     82     }
     83 
     84     m_styleSheet = StyleSheetContents::create(this, href, context);
     85 
     86     m_styleSheet->parseAuthorStyleSheet(cachedStyleSheet, document ? document->securityOrigin() : 0);
     87 
     88     m_loading = false;
     89 
     90     if (m_parentStyleSheet) {
     91         m_parentStyleSheet->notifyLoadedSheet(cachedStyleSheet);
     92         m_parentStyleSheet->checkLoaded();
     93     }
     94 }
     95 
     96 bool StyleRuleImport::isLoading() const
     97 {
     98     return m_loading || (m_styleSheet && m_styleSheet->isLoading());
     99 }
    100 
    101 void StyleRuleImport::requestStyleSheet()
    102 {
    103     if (!m_parentStyleSheet)
    104         return;
    105     Document* document = m_parentStyleSheet->singleOwnerDocument();
    106     if (!document)
    107         return;
    108 
    109     ResourceFetcher* fetcher = document->fetcher();
    110     if (!fetcher)
    111         return;
    112 
    113     KURL absURL;
    114     if (!m_parentStyleSheet->baseURL().isNull())
    115         // use parent styleheet's URL as the base URL
    116         absURL = KURL(m_parentStyleSheet->baseURL(), m_strHref);
    117     else
    118         absURL = document->completeURL(m_strHref);
    119 
    120     // Check for a cycle in our import chain.  If we encounter a stylesheet
    121     // in our parent chain with the same URL, then just bail.
    122     StyleSheetContents* rootSheet = m_parentStyleSheet;
    123     for (StyleSheetContents* sheet = m_parentStyleSheet; sheet; sheet = sheet->parentStyleSheet()) {
    124         if (equalIgnoringFragmentIdentifier(absURL, sheet->baseURL())
    125             || equalIgnoringFragmentIdentifier(absURL, document->completeURL(sheet->originalURL())))
    126             return;
    127         rootSheet = sheet;
    128     }
    129 
    130     FetchRequest request(ResourceRequest(absURL), FetchInitiatorTypeNames::css, m_parentStyleSheet->charset());
    131     m_resource = fetcher->fetchCSSStyleSheet(request);
    132     if (m_resource) {
    133         // if the import rule is issued dynamically, the sheet may be
    134         // removed from the pending sheet count, so let the doc know
    135         // the sheet being imported is pending.
    136         if (m_parentStyleSheet && m_parentStyleSheet->loadCompleted() && rootSheet == m_parentStyleSheet)
    137             m_parentStyleSheet->startLoadingDynamicSheet();
    138         m_loading = true;
    139         m_resource->addClient(&m_styleSheetClient);
    140     }
    141 }
    142 
    143 } // namespace WebCore
    144