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
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28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 */
31
32#include "config.h"
33#include "LinkRelAttribute.h"
34
35#include "Document.h"
36#include "LinkIconType.h"
37#include "RuntimeEnabledFeatures.h"
38#include "Settings.h"
39#include <wtf/text/StringView.h>
40#include <wtf/text/WTFString.h>
41
42namespace WebCore {
43
44LinkRelAttribute::LinkRelAttribute()
45{
46}
47
48// Keep LinkRelAttribute::isSupported() in sync when updating this constructor.
49LinkRelAttribute::LinkRelAttribute(Document& document, const String& rel)
50{
51 if (equalLettersIgnoringASCIICase(rel, "stylesheet"))
52 isStyleSheet = true;
53 else if (equalLettersIgnoringASCIICase(rel, "icon") || equalLettersIgnoringASCIICase(rel, "shortcut icon"))
54 iconType = LinkIconType::Favicon;
55 else if (equalLettersIgnoringASCIICase(rel, "apple-touch-icon"))
56 iconType = LinkIconType::TouchIcon;
57 else if (equalLettersIgnoringASCIICase(rel, "apple-touch-icon-precomposed"))
58 iconType = LinkIconType::TouchPrecomposedIcon;
59 else if (equalLettersIgnoringASCIICase(rel, "dns-prefetch"))
60 isDNSPrefetch = true;
61 else if (document.settings().linkPreconnectEnabled() && equalLettersIgnoringASCIICase(rel, "preconnect"))
62 isLinkPreconnect = true;
63 else if (RuntimeEnabledFeatures::sharedFeatures().linkPreloadEnabled() && equalLettersIgnoringASCIICase(rel, "preload"))
64 isLinkPreload = true;
65 else if (RuntimeEnabledFeatures::sharedFeatures().linkPrefetchEnabled() && equalLettersIgnoringASCIICase(rel, "prefetch"))
66 isLinkPrefetch = true;
67 else if (equalLettersIgnoringASCIICase(rel, "alternate stylesheet") || equalLettersIgnoringASCIICase(rel, "stylesheet alternate")) {
68 isStyleSheet = true;
69 isAlternate = true;
70#if ENABLE(APPLICATION_MANIFEST)
71 } else if (equalLettersIgnoringASCIICase(rel, "manifest")) {
72 isApplicationManifest = true;
73#endif
74 } else {
75 // Tokenize the rel attribute and set bits based on specific keywords that we find.
76 String relCopy = rel;
77 relCopy.replace('\n', ' ');
78 for (auto word : StringView(relCopy).split(' ')) {
79 if (equalLettersIgnoringASCIICase(word, "stylesheet"))
80 isStyleSheet = true;
81 else if (equalLettersIgnoringASCIICase(word, "alternate"))
82 isAlternate = true;
83 else if (equalLettersIgnoringASCIICase(word, "icon"))
84 iconType = LinkIconType::Favicon;
85 else if (equalLettersIgnoringASCIICase(word, "apple-touch-icon"))
86 iconType = LinkIconType::TouchIcon;
87 else if (equalLettersIgnoringASCIICase(word, "apple-touch-icon-precomposed"))
88 iconType = LinkIconType::TouchPrecomposedIcon;
89 }
90 }
91}
92
93// https://html.spec.whatwg.org/#linkTypes
94bool LinkRelAttribute::isSupported(Document& document, StringView attribute)
95{
96 static const char* const supportedAttributes[] = {
97 "alternate", "dns-prefetch", "icon", "stylesheet", "apple-touch-icon", "apple-touch-icon-precomposed",
98#if ENABLE(APPLICATION_MANIFEST)
99 "manifest",
100#endif
101 };
102
103 for (auto* supportedAttribute : supportedAttributes) {
104 if (equalIgnoringASCIICase(attribute, supportedAttribute))
105 return true;
106 }
107
108 if (document.settings().linkPreconnectEnabled() && equalIgnoringASCIICase(attribute, "preconnect"))
109 return true;
110
111 if (RuntimeEnabledFeatures::sharedFeatures().linkPreloadEnabled() && equalIgnoringASCIICase(attribute, "preload"))
112 return true;
113
114 if (RuntimeEnabledFeatures::sharedFeatures().linkPrefetchEnabled() && equalIgnoringASCIICase(attribute, "prefetch"))
115 return true;
116
117 return false;
118}
119
120}
121