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/FontCache.h"
38#include "platform/fonts/FontCustomPlatformData.h"
39#include "wtf/text/StringBuilder.h"
40
41namespace blink {
42
43#if ENABLE(SVG_FONTS)
44bool CSSFontFaceSrcValue::isSVGFontFaceSrc() const
45{
46    return equalIgnoringCase(m_format, "svg");
47}
48#endif
49
50bool CSSFontFaceSrcValue::isSupportedFormat() const
51{
52    // Normally we would just check the format, but in order to avoid conflicts with the old WinIE style of font-face,
53    // 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.
54    if (m_format.isEmpty()) {
55        // Check for .eot.
56        if (!m_resource.startsWith("data:", false) && m_resource.endsWith(".eot", false))
57            return false;
58        return true;
59    }
60
61    if (FontCustomPlatformData::supportsFormat(m_format))
62        return true;
63
64    // We have removed SVG font support on non-gdi platforms. For details, see:
65    // https://groups.google.com/a/chromium.org/d/msg/blink-dev/pYbbUcYvlYY/LQvFvM8KZZEJ
66#if ENABLE(SVG_FONTS)
67    if (RuntimeEnabledFeatures::svgFontsOnNonGDIPlatformsEnabled()
68#if OS(WIN)
69        || !FontCache::useDirectWrite()
70#endif
71        )
72        return isSVGFontFaceSrc();
73#endif
74    return false;
75}
76
77String CSSFontFaceSrcValue::customCSSText() const
78{
79    StringBuilder result;
80    if (isLocal())
81        result.appendLiteral("local(");
82    else
83        result.appendLiteral("url(");
84    result.append(m_resource);
85    result.append(')');
86    if (!m_format.isEmpty()) {
87        result.appendLiteral(" format(");
88        result.append(m_format);
89        result.append(')');
90    }
91    return result.toString();
92}
93
94bool CSSFontFaceSrcValue::hasFailedOrCanceledSubresources() const
95{
96    if (!m_fetched)
97        return false;
98    return m_fetched->loadFailedOrCanceled();
99}
100
101bool CSSFontFaceSrcValue::shouldSetCrossOriginAccessControl(const KURL& resource, SecurityOrigin* securityOrigin)
102{
103    if (resource.isLocalFile() || resource.protocolIsData())
104        return false;
105    return !securityOrigin->canRequest(resource);
106}
107
108FontResource* CSSFontFaceSrcValue::fetch(Document* document)
109{
110    if (!m_fetched) {
111        FetchRequest request(ResourceRequest(document->completeURL(m_resource)), FetchInitiatorTypeNames::css);
112        SecurityOrigin* securityOrigin = document->securityOrigin();
113        if (shouldSetCrossOriginAccessControl(request.url(), securityOrigin)) {
114            request.setCrossOriginAccessControl(securityOrigin, DoNotAllowStoredCredentials);
115        }
116        request.mutableResourceRequest().setHTTPReferrer(m_referrer);
117        m_fetched = document->fetcher()->fetchFont(request);
118    } else {
119        // FIXME: CSSFontFaceSrcValue::fetch is invoked when @font-face rule
120        // is processed by StyleResolver / StyleEngine.
121        restoreCachedResourceIfNeeded(document);
122    }
123    return m_fetched.get();
124}
125
126void CSSFontFaceSrcValue::restoreCachedResourceIfNeeded(Document* document)
127{
128    ASSERT(m_fetched);
129    ASSERT(document && document->fetcher());
130
131    const String resourceURL = document->completeURL(m_resource);
132    if (document->fetcher()->cachedResource(KURL(ParsedURLString, resourceURL)))
133        return;
134
135    FetchRequest request(ResourceRequest(resourceURL), FetchInitiatorTypeNames::css);
136    document->fetcher()->requestLoadStarted(m_fetched.get(), request, ResourceFetcher::ResourceLoadingFromCache);
137}
138
139bool CSSFontFaceSrcValue::equals(const CSSFontFaceSrcValue& other) const
140{
141    return m_isLocal == other.m_isLocal && m_format == other.m_format && m_resource == other.m_resource;
142}
143
144}
145