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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_
#define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_
#include <map>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/prefs/pref_change_registrar.h"
#include "base/synchronization/lock.h"
#include "components/content_settings/core/browser/content_settings_observable_provider.h"
class PrefService;
namespace user_prefs {
class PrefRegistrySyncable;
}
namespace content_settings {
// Provider that provides default content settings based on
// user prefs. If no default values are set by the user we use the hard coded
// default values.
class DefaultProvider : public ObservableProvider {
public:
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
DefaultProvider(PrefService* prefs,
bool incognito);
~DefaultProvider() override;
// ProviderInterface implementations.
scoped_ptr<RuleIterator> GetRuleIterator(
ContentSettingsType content_type,
const ResourceIdentifier& resource_identifier,
bool incognito) const override;
bool SetWebsiteSetting(const ContentSettingsPattern& primary_pattern,
const ContentSettingsPattern& secondary_pattern,
ContentSettingsType content_type,
const ResourceIdentifier& resource_identifier,
base::Value* value) override;
void ClearAllContentSettingsRules(ContentSettingsType content_type) override;
void ShutdownOnUIThread() override;
private:
// Reads all settings from the pref service.
void ReadDefaultSettings();
// Change the remembered setting in the memory.
void ChangeSetting(ContentSettingsType content_type, base::Value* value);
// True if |value| is NULL or it is the default value for |content_type|.
bool IsValueEmptyOrDefault(ContentSettingsType content_type,
base::Value* value);
// Reads the preference corresponding to |content_type|.
scoped_ptr<base::Value> ReadFromPref(ContentSettingsType content_type);
// Writes the value |value| to the preference corresponding to |content_type|.
// It's the responsibility of caller to obtain a lock and notify observers.
void WriteToPref(ContentSettingsType content_type,
base::Value* value);
// Called on prefs change.
void OnPreferenceChanged(const std::string& pref_name);
// Clean up the obsolete preferences from the user's profile.
void DiscardObsoletePreferences();
// Copies of the pref data, so that we can read it on the IO thread.
std::map<ContentSettingsType, scoped_ptr<base::Value>> default_settings_;
PrefService* prefs_;
// Whether this settings map is for an Incognito session.
bool is_incognito_;
// Used around accesses to the |default_settings_| object to guarantee
// thread safety.
mutable base::Lock lock_;
PrefChangeRegistrar pref_change_registrar_;
// Whether we are currently updating preferences, this is used to ignore
// notifications from the preferences service that we triggered ourself.
bool updating_preferences_;
DISALLOW_COPY_AND_ASSIGN(DefaultProvider);
};
} // namespace content_settings
#endif // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_
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