Source/core/css/CSSFontFaceSrcValue.cpp

/*
 * Copyright (C) 2007, 2010 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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#include "config.h"
#include "core/css/CSSFontFaceSrcValue.h"

#include "core/css/StyleSheetContents.h"
#include "core/dom/Document.h"
#include "core/dom/Node.h"
#include "core/fetch/FetchInitiatorTypeNames.h"
#include "core/fetch/FetchRequest.h"
#include "core/fetch/FontResource.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/loader/MixedContentChecker.h"
#include "platform/fonts/FontCache.h"
#include "platform/fonts/FontCustomPlatformData.h"
#include "platform/weborigin/SecurityPolicy.h"
#include "wtf/text/StringBuilder.h"

namespace blink {

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 go ahead and assume that we shouldn't load it.
    if (m_format.isEmpty())
        return m_resource.startsWith("data:", TextCaseInsensitive) || !m_resource.endsWith(".eot", TextCaseInsensitive);

    return FontCustomPlatformData::supportsFormat(m_format);
}

String CSSFontFaceSrcValue::customCSSText() const
{
    StringBuilder result;
    if (isLocal())
        result.appendLiteral("local(");
    else
        result.appendLiteral("url(");
    result.append(m_resource);
    result.append(')');
    if (!m_format.isEmpty()) {
        result.appendLiteral(" format(");
        result.append(m_format);
        result.append(')');
    }
    return result.toString();
}

bool CSSFontFaceSrcValue::hasFailedOrCanceledSubresources() const
{
    return m_fetched && m_fetched->loadFailedOrCanceled();
}

bool CSSFontFaceSrcValue::shouldSetCrossOriginAccessControl(const KURL& resource, SecurityOrigin* securityOrigin)
{
    if (resource.isLocalFile() || resource.protocolIsData())
        return false;
    return !securityOrigin->canRequest(resource);
}

FontResource* CSSFontFaceSrcValue::fetch(Document* document)
{
    if (!m_fetched) {
        FetchRequest request(ResourceRequest(document->completeURL(m_resource)), FetchInitiatorTypeNames::css);
        request.setContentSecurityCheck(m_shouldCheckContentSecurityPolicy);
        SecurityOrigin* securityOrigin = document->securityOrigin();
        if (shouldSetCrossOriginAccessControl(request.url(), securityOrigin)) {
            request.setCrossOriginAccessControl(securityOrigin, DoNotAllowStoredCredentials);
        }
        request.mutableResourceRequest().setHTTPReferrer(SecurityPolicy::generateReferrer(m_referrer.referrerPolicy, request.url(), m_referrer.referrer));
        m_fetched = FontResource::fetch(request, document->fetcher());
    } else {
        // FIXME: CSSFontFaceSrcValue::fetch is invoked when @font-face rule
        // is processed by StyleResolver / StyleEngine.
        restoreCachedResourceIfNeeded(document);
    }
    return m_fetched.get();
}

void CSSFontFaceSrcValue::restoreCachedResourceIfNeeded(Document* document)
{
    ASSERT(m_fetched);
    ASSERT(document && document->fetcher());

    const String resourceURL = document->completeURL(m_resource);
    if (document->fetcher()->cachedResource(KURL(ParsedURLString, resourceURL)))
        return;

    FetchRequest request(ResourceRequest(resourceURL), FetchInitiatorTypeNames::css);
    request.setContentSecurityCheck(m_shouldCheckContentSecurityPolicy);
    MixedContentChecker::shouldBlockFetch(document->frame(), m_fetched->lastResourceRequest(),
        m_fetched->lastResourceRequest().url(), MixedContentChecker::SendReport);
    document->fetcher()->requestLoadStarted(m_fetched.get(), request, ResourceFetcher::ResourceLoadingFromCache);
}

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

}