third_party/blink/renderer/core/html/parser/html_resource_preloader.cc

/*
 * Copyright (C) 2013 Google 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 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 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
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "third_party/blink/renderer/core/html/parser/html_resource_preloader.h"

#include <memory>
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_prescient_networking.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/deprecation.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_fetcher.h"

namespace blink {

HTMLResourcePreloader::HTMLResourcePreloader(Document& document)
    : document_(document) {}

HTMLResourcePreloader* HTMLResourcePreloader::Create(Document& document) {
  return MakeGarbageCollected<HTMLResourcePreloader>(document);
}

void HTMLResourcePreloader::Trace(Visitor* visitor) {
  visitor->Trace(document_);
}

static void PreconnectHost(PreloadRequest* request) {
  DCHECK(request);
  DCHECK(request->IsPreconnect());
  KURL host(request->BaseURL(), request->ResourceURL());
  if (!host.IsValid() || !host.ProtocolIsInHTTPFamily())
    return;
  WebPrescientNetworking* web_prescient_networking =
      Platform::Current()->PrescientNetworking();
  if (web_prescient_networking) {
    web_prescient_networking->Preconnect(
        host, request->CrossOrigin() != kCrossOriginAttributeAnonymous);
  }
}

void HTMLResourcePreloader::Preload(std::unique_ptr<PreloadRequest> preload) {
  if (preload->IsPreconnect()) {
    PreconnectHost(preload.get());
    return;
  }
  // TODO(yoichio): Should preload if document is imported.
  if (!document_->Loader())
    return;

  preload->Start(document_);
}

}  // namespace blink