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      1 /*
      2  * Copyright (C) 2007, 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/css/CSSFontFaceSrcValue.h"
     28 
     29 #include "core/FetchInitiatorTypeNames.h"
     30 #include "core/css/StyleSheetContents.h"
     31 #include "core/dom/Document.h"
     32 #include "core/dom/Node.h"
     33 #include "core/fetch/FetchRequest.h"
     34 #include "core/fetch/FontResource.h"
     35 #include "core/fetch/ResourceFetcher.h"
     36 #include "core/svg/SVGFontFaceElement.h"
     37 #include "platform/fonts/FontCustomPlatformData.h"
     38 #include "wtf/text/StringBuilder.h"
     39 
     40 namespace WebCore {
     41 
     42 #if ENABLE(SVG_FONTS)
     43 bool CSSFontFaceSrcValue::isSVGFontFaceSrc() const
     44 {
     45     return equalIgnoringCase(m_format, "svg");
     46 }
     47 #endif
     48 
     49 bool CSSFontFaceSrcValue::isSupportedFormat() const
     50 {
     51     // Normally we would just check the format, but in order to avoid conflicts with the old WinIE style of font-face,
     52     // we will also check to see if the URL ends with .eot.  If so, we'll go ahead and assume that we shouldn't load it.
     53     if (m_format.isEmpty()) {
     54         // Check for .eot.
     55         if (!m_resource.startsWith("data:", false) && m_resource.endsWith(".eot", false))
     56             return false;
     57         return true;
     58     }
     59 
     60     return FontCustomPlatformData::supportsFormat(m_format)
     61 #if ENABLE(SVG_FONTS)
     62            || isSVGFontFaceSrc()
     63 #endif
     64            ;
     65 }
     66 
     67 String CSSFontFaceSrcValue::customCSSText() const
     68 {
     69     StringBuilder result;
     70     if (isLocal())
     71         result.appendLiteral("local(");
     72     else
     73         result.appendLiteral("url(");
     74     result.append(m_resource);
     75     result.append(')');
     76     if (!m_format.isEmpty()) {
     77         result.appendLiteral(" format(");
     78         result.append(m_format);
     79         result.append(')');
     80     }
     81     return result.toString();
     82 }
     83 
     84 bool CSSFontFaceSrcValue::hasFailedOrCanceledSubresources() const
     85 {
     86     if (!m_fetched)
     87         return false;
     88     return m_fetched->loadFailedOrCanceled();
     89 }
     90 
     91 bool CSSFontFaceSrcValue::shouldSetCrossOriginAccessControl(const KURL& resource, SecurityOrigin* securityOrigin)
     92 {
     93     if (resource.isLocalFile() || resource.protocolIsData())
     94         return false;
     95     return !securityOrigin->canRequest(resource);
     96 }
     97 
     98 FontResource* CSSFontFaceSrcValue::fetch(Document* document)
     99 {
    100     if (!m_fetched) {
    101         FetchRequest request(ResourceRequest(document->completeURL(m_resource)), FetchInitiatorTypeNames::css);
    102         SecurityOrigin* securityOrigin = document->securityOrigin();
    103         if (shouldSetCrossOriginAccessControl(request.url(), securityOrigin)) {
    104             request.setCrossOriginAccessControl(securityOrigin, DoNotAllowStoredCredentials);
    105         }
    106         request.mutableResourceRequest().setHTTPReferrer(m_referrer);
    107         m_fetched = document->fetcher()->fetchFont(request);
    108     } else {
    109         // FIXME: CSSFontFaceSrcValue::fetch is invoked when @font-face rule
    110         // is processed by StyleResolver / StyleEngine.
    111         restoreCachedResourceIfNeeded(document);
    112     }
    113     return m_fetched.get();
    114 }
    115 
    116 void CSSFontFaceSrcValue::restoreCachedResourceIfNeeded(Document* document)
    117 {
    118     ASSERT(m_fetched);
    119     ASSERT(document && document->fetcher());
    120 
    121     const String resourceURL = document->completeURL(m_resource);
    122     if (document->fetcher()->cachedResource(KURL(ParsedURLString, resourceURL)))
    123         return;
    124 
    125     FetchRequest request(ResourceRequest(resourceURL), FetchInitiatorTypeNames::css);
    126     document->fetcher()->requestLoadStarted(m_fetched.get(), request, ResourceFetcher::ResourceLoadingFromCache);
    127 }
    128 
    129 bool CSSFontFaceSrcValue::equals(const CSSFontFaceSrcValue& other) const
    130 {
    131     return m_isLocal == other.m_isLocal && m_format == other.m_format && m_resource == other.m_resource;
    132 }
    133 
    134 }
    135