Source/WebCore/loader/LinkLoader.h

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * 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
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#pragma once

#include "CachedResource.h"
#include "CachedResourceClient.h"
#include "CachedResourceHandle.h"
#include "LinkLoaderClient.h"

#include <wtf/WeakPtr.h>

namespace WebCore {

class Document;
class URL;
class LinkPreloadResourceClient;

struct LinkRelAttribute;

class LinkLoader : private CachedResourceClient {
public:
    explicit LinkLoader(LinkLoaderClient&);
    virtual ~LinkLoader();

    bool loadLink(const LinkRelAttribute&, const URL&, const String& as, const String& media, const String& type, const String& crossOrigin, Document&);
    static std::optional<CachedResource::Type> resourceTypeFromAsAttribute(const String& as);

    enum class MediaAttributeCheck { MediaAttributeEmpty, MediaAttributeNotEmpty, SkipMediaAttributeCheck };
    static void loadLinksFromHeader(const String& headerValue, const URL& baseURL, Document&, MediaAttributeCheck);
    static bool isSupportedType(CachedResource::Type, const String& mimeType);

    WeakPtr<LinkLoader> createWeakPtr() { return m_weakPtrFactory.createWeakPtr(*this); }
    void triggerEvents(const CachedResource&);
    void cancelLoad();

private:
    void notifyFinished(CachedResource&) override;
    static void preconnectIfNeeded(const LinkRelAttribute&, const URL& href, Document&, const String& crossOrigin);
    static std::unique_ptr<LinkPreloadResourceClient> preloadIfNeeded(const LinkRelAttribute&, const URL& href, Document&, const String& as, const String& media, const String& type, const String& crossOriginMode, LinkLoader*);
    void prefetchIfNeeded(const LinkRelAttribute&, const URL& href, Document&);

    LinkLoaderClient& m_client;
    CachedResourceHandle<CachedResource> m_cachedLinkResource;
    std::unique_ptr<LinkPreloadResourceClient> m_preloadResourceClient;
    WeakPtrFactory<LinkLoader> m_weakPtrFactory;
};

}