third_party/blink/renderer/core/css/css_font_face_src_value.cc

/*
 * Copyright (C) 2007, 2010 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * 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 COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "third_party/blink/renderer/core/css/css_font_face_src_value.h"

#include "base/feature_list.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/loader/referrer_utils.h"
#include "third_party/blink/public/mojom/fetch/fetch_api_request.mojom-blink.h"
#include "third_party/blink/public/platform/web_url_request.h"
#include "third_party/blink/renderer/core/css/css_markup.h"
#include "third_party/blink/renderer/core/css/css_uri_value.h"
#include "third_party/blink/renderer/core/css/style_sheet_contents.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/node.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/loader/resource/font_resource.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/fonts/font_custom_platform_data.h"
#include "third_party/blink/renderer/platform/loader/fetch/cross_origin_attribute_value.h"
#include "third_party/blink/renderer/platform/loader/fetch/fetch_initiator_type_names.h"
#include "third_party/blink/renderer/platform/loader/fetch/fetch_parameters.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_fetcher.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_loader_options.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"

namespace blink {

namespace {

String TechnologyToString(CSSFontFaceSrcValue::FontTechnology font_technology) {
  // According to
  // https://drafts.csswg.org/cssom/#serialize-a-css-component-value these all
  // need to be serialized as lowercase.
  switch (font_technology) {
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyVariations:
      return "variations";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyFeaturesAAT:
      return "features-aat";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyFeaturesOT:
      return "features-opentype";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyPalettes:
      return "palettes";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyCOLRv0:
      return "color-colrv0";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyCOLRv1:
      return "color-colrv1";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyCDBT:
      return "color-cbdt";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologySBIX:
      return "color-sbix";
    case CSSFontFaceSrcValue::FontTechnology::kTechnologyUnknown:
      NOTREACHED();
      return String();
  }
}

}  // namespace

bool CSSFontFaceSrcValue::IsSupportedFormat() const {
  // format() syntax is already checked at parse time, see
  // AtRuleDescriptorParser.
  if (!format_.empty()) {
    return true;
  }

  // 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.
  const String& resolved_url_string =
      src_value_->UrlData().ResolvedUrl().GetString();
  return ProtocolIs(resolved_url_string, "data") ||
         !resolved_url_string.EndsWithIgnoringASCIICase(".eot");
}

void CSSFontFaceSrcValue::AppendTechnology(FontTechnology technology) {
  if (!technologies_.Contains(technology)) {
    technologies_.push_back(technology);
  }
}

String CSSFontFaceSrcValue::CustomCSSText() const {
  StringBuilder result;
  if (IsLocal()) {
    result.Append("local(");
    result.Append(SerializeString(LocalResource()));
    result.Append(')');
  } else {
    result.Append(src_value_->CssText());
  }

  if (!format_.empty()) {
    result.Append(" format(");
    // Format should be serialized as strings:
    // https://github.com/w3c/csswg-drafts/issues/6328#issuecomment-971823790
    result.Append(SerializeString(format_));
    result.Append(')');
  }

  if (!technologies_.empty()) {
    result.Append(" tech(");
    for (wtf_size_t i = 0; i < technologies_.size(); ++i) {
      result.Append(TechnologyToString(technologies_[i]));
      if (i < technologies_.size() - 1) {
        result.Append(", ");
      }
    }
    result.Append(")");
  }

  return result.ReleaseString();
}

bool CSSFontFaceSrcValue::HasFailedOrCanceledSubresources() const {
  return fetched_ && fetched_->LoadFailedOrCanceled();
}

FontResource& CSSFontFaceSrcValue::Fetch(ExecutionContext* context,
                                         FontResourceClient* client) const {
  if (!fetched_ || fetched_->Options().world_for_csp != world_) {
    const CSSUrlData& url_data = src_value_->UrlData();
    const Referrer& referrer = url_data.GetReferrer();
    ResourceRequest resource_request(url_data.ResolvedUrl());
    resource_request.SetReferrerPolicy(
        ReferrerUtils::MojoReferrerPolicyResolveDefault(
            referrer.referrer_policy));
    resource_request.SetReferrerString(referrer.referrer);
    if (url_data.IsAdRelated()) {
      resource_request.SetIsAdResource();
    }
    ResourceLoaderOptions options(world_);
    options.initiator_info.name = fetch_initiator_type_names::kCSS;
    if (referrer.referrer != Referrer::ClientReferrerString()) {
      options.initiator_info.referrer = referrer.referrer;
    }
    FetchParameters params(std::move(resource_request), options);
    if (base::FeatureList::IsEnabled(
            features::kWebFontsCacheAwareTimeoutAdaption)) {
      params.SetCacheAwareLoadingEnabled(kIsCacheAwareLoadingEnabled);
    }
    params.SetFromOriginDirtyStyleSheet(
        !url_data.IsFromOriginCleanStyleSheet());
    const SecurityOrigin* security_origin = context->GetSecurityOrigin();

    // Local fonts are accessible from file: URLs even when
    // allowFileAccessFromFileURLs is false.
    if (!params.Url().IsLocalFile()) {
      params.SetCrossOriginAccessControl(security_origin,
                                         kCrossOriginAttributeAnonymous);
    }
    fetched_ = FontResource::Fetch(params, context->Fetcher(), client);
  } else {
    // FIXME: CSSFontFaceSrcValue::Fetch is invoked when @font-face rule
    // is processed by StyleResolver / StyleEngine.
    RestoreCachedResourceIfNeeded(context);
    if (client) {
      client->SetResource(
          fetched_.Get(),
          context->GetTaskRunner(TaskType::kInternalLoading).get());
    }
  }
  return *fetched_;
}

void CSSFontFaceSrcValue::RestoreCachedResourceIfNeeded(
    ExecutionContext* context) const {
  DCHECK(fetched_);
  DCHECK(context);
  DCHECK(context->Fetcher());
  context->Fetcher()->EmulateLoadStartedForInspector(
      fetched_, KURL(src_value_->UrlData().ResolvedUrl()),
      mojom::blink::RequestContextType::FONT,
      network::mojom::RequestDestination::kFont,
      fetch_initiator_type_names::kCSS);
}

bool CSSFontFaceSrcValue::Equals(const CSSFontFaceSrcValue& other) const {
  return format_ == other.format_ &&
         base::ValuesEquivalent(src_value_, other.src_value_) &&
         local_resource_ == other.local_resource_;
}

void CSSFontFaceSrcValue::TraceAfterDispatch(Visitor* visitor) const {
  visitor->Trace(src_value_);
  visitor->Trace(fetched_);
  visitor->Trace(world_);
  CSSValue::TraceAfterDispatch(visitor);
}

}  // namespace blink