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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* 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
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "web/ContextFeaturesClientImpl.h"
#include "core/dom/Document.h"
#include "platform/weborigin/SecurityOrigin.h"
#include "public/web/WebDocument.h"
#include "public/web/WebPermissionClient.h"
#include "web/WebLocalFrameImpl.h"
using namespace WebCore;
namespace blink {
class ContextFeaturesCache FINAL : public NoBaseWillBeGarbageCollectedFinalized<ContextFeaturesCache>, public DocumentSupplement {
WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ContextFeaturesCache);
public:
class Entry {
public:
enum Value {
IsEnabled,
IsDisabled,
NeedsRefresh
};
Entry()
: m_value(NeedsRefresh)
, m_defaultValue(false)
{ }
bool isEnabled() const
{
ASSERT(m_value != NeedsRefresh);
return m_value == IsEnabled;
}
void set(bool value, bool defaultValue)
{
m_value = value ? IsEnabled : IsDisabled;
m_defaultValue = defaultValue;
}
bool needsRefresh(bool defaultValue) const
{
return m_value == NeedsRefresh || m_defaultValue != defaultValue;
}
private:
Value m_value;
bool m_defaultValue; // Needs to be traked as a part of the signature since it can be changed dynamically.
};
static const char* supplementName();
static ContextFeaturesCache& from(Document&);
Entry& entryFor(ContextFeatures::FeatureType type)
{
size_t index = static_cast<size_t>(type);
ASSERT_WITH_SECURITY_IMPLICATION(index < ContextFeatures::FeatureTypeSize);
return m_entries[index];
}
void validateAgainst(Document*);
private:
String m_domain;
Entry m_entries[ContextFeatures::FeatureTypeSize];
};
const char* ContextFeaturesCache::supplementName()
{
return "ContextFeaturesCache";
}
ContextFeaturesCache& ContextFeaturesCache::from(Document& document)
{
ContextFeaturesCache* cache = static_cast<ContextFeaturesCache*>(DocumentSupplement::from(document, supplementName()));
if (!cache) {
cache = new ContextFeaturesCache();
DocumentSupplement::provideTo(document, supplementName(), adoptPtrWillBeNoop(cache));
}
return *cache;
}
void ContextFeaturesCache::validateAgainst(Document* document)
{
String currentDomain = document->securityOrigin()->domain();
if (currentDomain == m_domain)
return;
m_domain = currentDomain;
for (size_t i = 0; i < ContextFeatures::FeatureTypeSize; ++i)
m_entries[i] = Entry();
}
bool ContextFeaturesClientImpl::isEnabled(Document* document, ContextFeatures::FeatureType type, bool defaultValue)
{
ASSERT(document);
ContextFeaturesCache::Entry& cache = ContextFeaturesCache::from(*document).entryFor(type);
if (cache.needsRefresh(defaultValue))
cache.set(askIfIsEnabled(document, type, defaultValue), defaultValue);
return cache.isEnabled();
}
void ContextFeaturesClientImpl::urlDidChange(Document* document)
{
ASSERT(document);
ContextFeaturesCache::from(*document).validateAgainst(document);
}
bool ContextFeaturesClientImpl::askIfIsEnabled(Document* document, ContextFeatures::FeatureType type, bool defaultValue)
{
WebLocalFrameImpl* frame = WebLocalFrameImpl::fromFrame(document->frame());
if (!frame || !frame->permissionClient())
return defaultValue;
switch (type) {
case ContextFeatures::MutationEvents:
return frame->permissionClient()->allowMutationEvents(defaultValue);
case ContextFeatures::PushState:
return frame->permissionClient()->allowPushState();
default:
return defaultValue;
}
}
} // namespace blink
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