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/*
* Copyright (C) 2011 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*
*/
#ifndef LinkLoader_h
#define LinkLoader_h
#include "core/CoreExport.h"
#include "core/fetch/ResourceClient.h"
#include "core/fetch/ResourceOwner.h"
#include "core/loader/LinkLoaderClient.h"
#include "core/loader/resource/LinkPreloadResourceClients.h"
#include "platform/CrossOriginAttributeValue.h"
#include "platform/PrerenderClient.h"
#include "platform/Timer.h"
#include "platform/heap/Handle.h"
#include "wtf/Optional.h"
namespace blink {
class Document;
class LinkRelAttribute;
class NetworkHintsInterface;
class PrerenderHandle;
struct ViewportDescriptionWrapper;
// The LinkLoader can load link rel types icon, dns-prefetch, subresource,
// prefetch and prerender.
class CORE_EXPORT LinkLoader final
: public GarbageCollectedFinalized<LinkLoader>,
public ResourceOwner<Resource, ResourceClient>,
public PrerenderClient {
USING_GARBAGE_COLLECTED_MIXIN(LinkLoader);
public:
static LinkLoader* create(LinkLoaderClient* client) {
return new LinkLoader(client);
}
~LinkLoader() override;
// from ResourceClient
void notifyFinished(Resource*) override;
String debugName() const override { return "LinkLoader"; }
// from PrerenderClient
void didStartPrerender() override;
void didStopPrerender() override;
void didSendLoadForPrerender() override;
void didSendDOMContentLoadedForPrerender() override;
void triggerEvents(const Resource*);
void released();
bool loadLink(const LinkRelAttribute&,
CrossOriginAttributeValue,
const String& type,
const String& as,
const String& media,
ReferrerPolicy,
const KURL&,
Document&,
const NetworkHintsInterface&);
enum CanLoadResources {
OnlyLoadResources,
DoNotLoadResources,
LoadResourcesAndPreconnect
};
// Media links cannot be preloaded until the first chunk is parsed. The rest
// can be preloaded at commit time.
enum MediaPreloadPolicy { LoadAll, OnlyLoadNonMedia, OnlyLoadMedia };
static void loadLinksFromHeader(const String& headerValue,
const KURL& baseURL,
Document*,
const NetworkHintsInterface&,
CanLoadResources,
MediaPreloadPolicy,
ViewportDescriptionWrapper*);
static WTF::Optional<Resource::Type> getResourceTypeFromAsAttribute(
const String& as);
DECLARE_TRACE();
private:
explicit LinkLoader(LinkLoaderClient*);
void linkLoadTimerFired(TimerBase*);
void linkLoadingErrorTimerFired(TimerBase*);
void createLinkPreloadResourceClient(Resource*);
Member<LinkLoaderClient> m_client;
Timer<LinkLoader> m_linkLoadTimer;
Timer<LinkLoader> m_linkLoadingErrorTimer;
Member<PrerenderHandle> m_prerender;
Member<LinkPreloadResourceClient> m_linkPreloadResourceClient;
};
} // namespace blink
#endif
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