1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 */
31
32#pragma once
33
34#include "CachedResource.h"
35#include "CachedResourceClient.h"
36#include "CachedResourceHandle.h"
37#include "LinkLoaderClient.h"
38
39#include <wtf/WeakPtr.h>
40
41namespace WebCore {
42
43class Document;
44class LinkPreloadResourceClient;
45
46struct LinkRelAttribute;
47
48class LinkLoader : private CachedResourceClient, public CanMakeWeakPtr<LinkLoader> {
49public:
50 explicit LinkLoader(LinkLoaderClient&);
51 virtual ~LinkLoader();
52
53 bool loadLink(const LinkRelAttribute&, const URL&, const String& as, const String& media, const String& type, const String& crossOrigin, const String& imageSrcSet, const String& imageSizes, Document&);
54 static Optional<CachedResource::Type> resourceTypeFromAsAttribute(const String& as);
55
56 enum class MediaAttributeCheck { MediaAttributeEmpty, MediaAttributeNotEmpty, SkipMediaAttributeCheck };
57 static void loadLinksFromHeader(const String& headerValue, const URL& baseURL, Document&, MediaAttributeCheck);
58 static bool isSupportedType(CachedResource::Type, const String& mimeType);
59
60 void triggerEvents(const CachedResource&);
61 void cancelLoad();
62
63private:
64 void notifyFinished(CachedResource&) override;
65 static void preconnectIfNeeded(const LinkRelAttribute&, const URL& href, Document&, const String& crossOrigin);
66 static std::unique_ptr<LinkPreloadResourceClient> preloadIfNeeded(const LinkRelAttribute&, const URL& href, Document&, const String& as, const String& media, const String& type, const String& crossOriginMode, const String&, const String&, LinkLoader*);
67 void prefetchIfNeeded(const LinkRelAttribute&, const URL& href, Document&);
68
69 LinkLoaderClient& m_client;
70 CachedResourceHandle<CachedResource> m_cachedLinkResource;
71 std::unique_ptr<LinkPreloadResourceClient> m_preloadResourceClient;
72};
73
74}
75