Source/WebCore/css/CSSFontFaceSrcValue.cpp

/*
 * Copyright (C) 2007-2017 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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#include "config.h"
#include "CSSFontFaceSrcValue.h"
#include "CachedFont.h"
#include "CachedResourceLoader.h"
#include "CachedResourceRequest.h"
#include "CachedResourceRequestInitiators.h"
#include "Document.h"
#include "FontCustomPlatformData.h"
#include "Node.h"
#include "SVGFontFaceElement.h"
#include <wtf/text/StringBuilder.h>

namespace WebCore {

#if ENABLE(SVG_FONTS)
bool CSSFontFaceSrcValue::isSVGFontFaceSrc() const
{
    return equalLettersIgnoringASCIICase(m_format, "svg");
}

bool CSSFontFaceSrcValue::isSVGFontTarget() const
{
    return isSVGFontFaceSrc() || svgFontFaceElement();
}
#endif

bool CSSFontFaceSrcValue::isSupportedFormat() const
{
    // Normally we would just check the format, but in order to avoid conflicts with the old WinIE style of font-face,
    // we will also check to see if the URL ends with .eot. If so, we'll assume that we shouldn't load it.
    if (m_format.isEmpty()) {
        // Check for .eot.
        if (!protocolIs(m_resource, "data") && m_resource.endsWithIgnoringASCIICase(".eot"))
            return false;
        return true;
    }

    return FontCustomPlatformData::supportsFormat(m_format)
#if ENABLE(SVG_FONTS)
           || isSVGFontFaceSrc()
#endif
           ;
}

String CSSFontFaceSrcValue::customCSSText() const
{
    const char* prefix = isLocal() ? "local(" : "url(";
    if (m_format.isEmpty())
        return makeString(prefix, m_resource, ')');
    return makeString(prefix, m_resource, ')', " format(", m_format, ')');
}

bool CSSFontFaceSrcValue::traverseSubresources(const WTF::Function<bool (const CachedResource&)>& handler) const
{
    if (!m_cachedFont)
        return false;
    return handler(*m_cachedFont);
}

CachedFont* CSSFontFaceSrcValue::cachedFont(Document* document, bool isSVG, bool isInitiatingElementInUserAgentShadowTree)
{
    if (m_cachedFont)
        return m_cachedFont.get();

    ResourceLoaderOptions options = CachedResourceLoader::defaultCachedResourceOptions();
    options.contentSecurityPolicyImposition = isInitiatingElementInUserAgentShadowTree ? ContentSecurityPolicyImposition::SkipPolicyCheck : ContentSecurityPolicyImposition::DoPolicyCheck;
    options.loadedFromOpaqueSource = m_loadedFromOpaqueSource;

    CachedResourceRequest request(ResourceRequest(document->completeURL(m_resource)), options);
    request.setInitiator(cachedResourceRequestInitiators().css);
    m_cachedFont = document->cachedResourceLoader().requestFont(WTFMove(request), isSVG).value_or(nullptr);
    return m_cachedFont.get();
}

bool CSSFontFaceSrcValue::equals(const CSSFontFaceSrcValue& other) const
{
    return m_isLocal == other.m_isLocal && m_format == other.m_format && m_resource == other.m_resource;
}

}