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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 "third_party/blink/renderer/core/dom/context_features_client_impl.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/content_settings_client.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/platform/weborigin/security_origin.h"
namespace blink {
class ContextFeaturesCache final
: public GarbageCollectedFinalized<ContextFeaturesCache>,
public Supplement<Document> {
USING_GARBAGE_COLLECTED_MIXIN(ContextFeaturesCache);
public:
static const char kSupplementName[];
class Entry {
public:
enum Value { kIsEnabled, kIsDisabled, kNeedsRefresh };
Entry() : value_(kNeedsRefresh), default_value_(false) {}
bool IsEnabled() const {
DCHECK_NE(value_, kNeedsRefresh);
return value_ == kIsEnabled;
}
void Set(bool value, bool default_value) {
value_ = value ? kIsEnabled : kIsDisabled;
default_value_ = default_value;
}
bool NeedsRefresh(bool default_value) const {
return value_ == kNeedsRefresh || default_value_ != default_value;
}
private:
Value value_;
bool default_value_; // Needs to be traked as a part of the signature since
// it can be changed dynamically.
};
static ContextFeaturesCache& From(Document&);
Entry& EntryFor(ContextFeatures::FeatureType type) {
size_t index = static_cast<size_t>(type);
SECURITY_DCHECK(index < ContextFeatures::kFeatureTypeSize);
return entries_[index];
}
void ValidateAgainst(Document*);
void Trace(blink::Visitor* visitor) override {
Supplement<Document>::Trace(visitor);
}
private:
explicit ContextFeaturesCache(Document& document)
: Supplement<Document>(document) {}
String domain_;
Entry entries_[ContextFeatures::kFeatureTypeSize];
};
const char ContextFeaturesCache::kSupplementName[] = "ContextFeaturesCache";
ContextFeaturesCache& ContextFeaturesCache::From(Document& document) {
ContextFeaturesCache* cache =
Supplement<Document>::From<ContextFeaturesCache>(document);
if (!cache) {
cache = new ContextFeaturesCache(document);
ProvideTo(document, cache);
}
return *cache;
}
void ContextFeaturesCache::ValidateAgainst(Document* document) {
String current_domain = document->GetSecurityOrigin()->Domain();
if (current_domain == domain_)
return;
domain_ = current_domain;
for (size_t i = 0; i < ContextFeatures::kFeatureTypeSize; ++i)
entries_[i] = Entry();
}
bool ContextFeaturesClientImpl::IsEnabled(Document* document,
ContextFeatures::FeatureType type,
bool default_value) {
DCHECK(document);
ContextFeaturesCache::Entry& cache =
ContextFeaturesCache::From(*document).EntryFor(type);
if (cache.NeedsRefresh(default_value))
cache.Set(AskIfIsEnabled(document, type, default_value), default_value);
return cache.IsEnabled();
}
void ContextFeaturesClientImpl::UrlDidChange(Document* document) {
DCHECK(document);
ContextFeaturesCache::From(*document).ValidateAgainst(document);
}
bool ContextFeaturesClientImpl::AskIfIsEnabled(
Document* document,
ContextFeatures::FeatureType type,
bool default_value) {
LocalFrame* frame = document->GetFrame();
if (!frame || !frame->GetContentSettingsClient())
return default_value;
switch (type) {
case ContextFeatures::kMutationEvents:
return frame->GetContentSettingsClient()->AllowMutationEvents(
default_value);
default:
return default_value;
}
}
} // namespace blink
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