1 /*
2 * Copyright (C) 2012 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 #include "config.h"
32 #include "web/ContextFeaturesClientImpl.h"
33
34 #include "core/dom/Document.h"
35 #include "platform/weborigin/SecurityOrigin.h"
36 #include "public/web/WebDocument.h"
37 #include "public/web/WebPermissionClient.h"
38 #include "web/WebLocalFrameImpl.h"
39
40 using namespace WebCore;
41
42 namespace blink {
43
44 class ContextFeaturesCache FINAL : public NoBaseWillBeGarbageCollectedFinalized<ContextFeaturesCache>, public DocumentSupplement {
45 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ContextFeaturesCache);
46 public:
47 class Entry {
48 public:
49 enum Value {
50 IsEnabled,
51 IsDisabled,
52 NeedsRefresh
53 };
54
Entry()55 Entry()
56 : m_value(NeedsRefresh)
57 , m_defaultValue(false)
58 { }
59
isEnabled() const60 bool isEnabled() const
61 {
62 ASSERT(m_value != NeedsRefresh);
63 return m_value == IsEnabled;
64 }
65
set(bool value,bool defaultValue)66 void set(bool value, bool defaultValue)
67 {
68 m_value = value ? IsEnabled : IsDisabled;
69 m_defaultValue = defaultValue;
70 }
71
needsRefresh(bool defaultValue) const72 bool needsRefresh(bool defaultValue) const
73 {
74 return m_value == NeedsRefresh || m_defaultValue != defaultValue;
75 }
76
77 private:
78 Value m_value;
79 bool m_defaultValue; // Needs to be traked as a part of the signature since it can be changed dynamically.
80 };
81
82 static const char* supplementName();
83 static ContextFeaturesCache& from(Document&);
84
entryFor(ContextFeatures::FeatureType type)85 Entry& entryFor(ContextFeatures::FeatureType type)
86 {
87 size_t index = static_cast<size_t>(type);
88 ASSERT_WITH_SECURITY_IMPLICATION(index < ContextFeatures::FeatureTypeSize);
89 return m_entries[index];
90 }
91
92 void validateAgainst(Document*);
93
94 private:
95 String m_domain;
96 Entry m_entries[ContextFeatures::FeatureTypeSize];
97 };
98
supplementName()99 const char* ContextFeaturesCache::supplementName()
100 {
101 return "ContextFeaturesCache";
102 }
103
from(Document & document)104 ContextFeaturesCache& ContextFeaturesCache::from(Document& document)
105 {
106 ContextFeaturesCache* cache = static_cast<ContextFeaturesCache*>(DocumentSupplement::from(document, supplementName()));
107 if (!cache) {
108 cache = new ContextFeaturesCache();
109 DocumentSupplement::provideTo(document, supplementName(), adoptPtrWillBeNoop(cache));
110 }
111
112 return *cache;
113 }
114
validateAgainst(Document * document)115 void ContextFeaturesCache::validateAgainst(Document* document)
116 {
117 String currentDomain = document->securityOrigin()->domain();
118 if (currentDomain == m_domain)
119 return;
120 m_domain = currentDomain;
121 for (size_t i = 0; i < ContextFeatures::FeatureTypeSize; ++i)
122 m_entries[i] = Entry();
123 }
124
isEnabled(Document * document,ContextFeatures::FeatureType type,bool defaultValue)125 bool ContextFeaturesClientImpl::isEnabled(Document* document, ContextFeatures::FeatureType type, bool defaultValue)
126 {
127 ASSERT(document);
128 ContextFeaturesCache::Entry& cache = ContextFeaturesCache::from(*document).entryFor(type);
129 if (cache.needsRefresh(defaultValue))
130 cache.set(askIfIsEnabled(document, type, defaultValue), defaultValue);
131 return cache.isEnabled();
132 }
133
urlDidChange(Document * document)134 void ContextFeaturesClientImpl::urlDidChange(Document* document)
135 {
136 ASSERT(document);
137 ContextFeaturesCache::from(*document).validateAgainst(document);
138 }
139
askIfIsEnabled(Document * document,ContextFeatures::FeatureType type,bool defaultValue)140 bool ContextFeaturesClientImpl::askIfIsEnabled(Document* document, ContextFeatures::FeatureType type, bool defaultValue)
141 {
142 WebLocalFrameImpl* frame = WebLocalFrameImpl::fromFrame(document->frame());
143 if (!frame || !frame->permissionClient())
144 return defaultValue;
145
146 switch (type) {
147 case ContextFeatures::MutationEvents:
148 return frame->permissionClient()->allowMutationEvents(defaultValue);
149 case ContextFeatures::PushState:
150 return frame->permissionClient()->allowPushState();
151 default:
152 return defaultValue;
153 }
154 }
155
156 } // namespace blink
157