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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_POLICY_POLICY_RECOMMENDATION_RESTORER_H_
#define ASH_POLICY_POLICY_RECOMMENDATION_RESTORER_H_
#include <memory>
#include <set>
#include <string>
#include "ash/public/cpp/session/session_observer.h"
#include "base/timer/timer.h"
#include "ui/base/user_activity/user_activity_observer.h"
class PrefChangeRegistrar;
class PrefService;
namespace ash {
// Manages observing a set of prefs on signin screen. If any of the prefs has a
// recommended value on observing, or changed to have recommended value or
// active user session started, its user settings is cleared so that the
// recommendation can take effect. On signin screen prefs, user settings are
// cleared when the user becomes idle for one minute.
//
// The above efforts are made to ensure that the observed prefs are *policy*
// overridden and can be restored properly. For example, a demo device on a
// store shelf. One customer walks up to device and enables some a11y features,
// leaving the device in a "funny" state (high contrast, screen magnifier,
// spoken feedback enabled). After some time, another customer won't feel the
// device looks "broken".
class PolicyRecommendationRestorer : public SessionObserver,
public ui::UserActivityObserver {
public:
PolicyRecommendationRestorer();
PolicyRecommendationRestorer(const PolicyRecommendationRestorer&) = delete;
PolicyRecommendationRestorer& operator=(const PolicyRecommendationRestorer&) =
delete;
~PolicyRecommendationRestorer() override;
// Caller calls to start observing recommended value for |pref_name|. It
// should be called when signin pref service is connected but before
// observing/loading user settings for |pref_name|.
void ObservePref(const std::string& pref_name);
// SessionObserver:
void OnActiveUserPrefServiceChanged(PrefService* pref_service) override;
// ui::UserActivityObserver:
void OnUserActivity(const ui::Event* event) override;
void DisableForTesting();
base::OneShotTimer* restore_timer_for_test() { return &restore_timer_; }
private:
// If a recommended value and a user setting exist for |pref_name|, clears the
// user setting so that the recommended value can take effect. If
// |allow_delay| is |true| and user prefs not started yet, a timer is started
// that will clear the setting when the user becomes idle for one minute.
// Otherwise, the setting is cleared immediately.
void Restore(bool allow_delay, const std::string& pref_name);
void RestoreAll();
void StartTimer();
void StopTimer();
std::set<std::string> pref_names_;
std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_;
bool active_user_pref_connected_ = false;
base::OneShotTimer restore_timer_;
bool disabled_for_testing_ = false;
};
} // namespace ash
#endif // ASH_POLICY_POLICY_RECOMMENDATION_RESTORER_H_
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