| /* |
| * 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" |
| |
| 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 |