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      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 
     55         Entry()
     56             : m_value(NeedsRefresh)
     57             , m_defaultValue(false)
     58         { }
     59 
     60         bool isEnabled() const
     61         {
     62             ASSERT(m_value != NeedsRefresh);
     63             return m_value == IsEnabled;
     64         }
     65 
     66         void set(bool value, bool defaultValue)
     67         {
     68             m_value = value ? IsEnabled : IsDisabled;
     69             m_defaultValue = defaultValue;
     70         }
     71 
     72         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 
     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 
     99 const char* ContextFeaturesCache::supplementName()
    100 {
    101     return "ContextFeaturesCache";
    102 }
    103 
    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 
    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 
    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 
    134 void ContextFeaturesClientImpl::urlDidChange(Document* document)
    135 {
    136     ASSERT(document);
    137     ContextFeaturesCache::from(*document).validateAgainst(document);
    138 }
    139 
    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