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- // Copyright 2018 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.
- #include "ash/policy/policy_recommendation_restorer.h"
- #include "ash/session/session_controller_impl.h"
- #include "ash/shell.h"
- #include "base/bind.h"
- #include "base/check.h"
- #include "base/containers/contains.h"
- #include "base/notreached.h"
- #include "components/prefs/pref_change_registrar.h"
- #include "components/prefs/pref_service.h"
- #include "ui/base/user_activity/user_activity_detector.h"
- namespace ash {
- namespace {
- // The amount of idle time after which recommended values are restored.
- constexpr base::TimeDelta kRestoreDelayInMinutes = base::Minutes(1);
- } // namespace
- PolicyRecommendationRestorer::PolicyRecommendationRestorer() {
- Shell::Get()->session_controller()->AddObserver(this);
- }
- PolicyRecommendationRestorer::~PolicyRecommendationRestorer() {
- StopTimer();
- Shell::Get()->session_controller()->RemoveObserver(this);
- }
- void PolicyRecommendationRestorer::ObservePref(const std::string& pref_name) {
- PrefService* prefs =
- Shell::Get()->session_controller()->GetSigninScreenPrefService();
- DCHECK(prefs);
- DCHECK(!base::Contains(pref_names_, pref_name));
- if (!pref_change_registrar_) {
- pref_change_registrar_ = std::make_unique<PrefChangeRegistrar>();
- pref_change_registrar_->Init(prefs);
- }
- pref_change_registrar_->Add(
- pref_name, base::BindRepeating(&PolicyRecommendationRestorer::Restore,
- base::Unretained(this), true));
- pref_names_.insert(pref_name);
- Restore(false /* allow_delay */, pref_name);
- }
- void PolicyRecommendationRestorer::OnActiveUserPrefServiceChanged(
- PrefService* pref_service) {
- active_user_pref_connected_ = true;
- StopTimer();
- RestoreAll();
- }
- void PolicyRecommendationRestorer::OnUserActivity(const ui::Event* event) {
- if (restore_timer_.IsRunning())
- restore_timer_.Reset();
- }
- void PolicyRecommendationRestorer::DisableForTesting() {
- disabled_for_testing_ = true;
- }
- void PolicyRecommendationRestorer::Restore(bool allow_delay,
- const std::string& pref_name) {
- const PrefService::Preference* pref =
- pref_change_registrar_->prefs()->FindPreference(pref_name);
- if (!pref) {
- NOTREACHED();
- return;
- }
- if (!pref->GetRecommendedValue() || !pref->HasUserSetting())
- return;
- if (active_user_pref_connected_) {
- allow_delay = false;
- } else if (allow_delay) {
- // Skip the delay if there has been no user input since |pref_name| is
- // started observing recommended value.
- const ui::UserActivityDetector* user_activity_detector =
- ui::UserActivityDetector::Get();
- if (user_activity_detector &&
- user_activity_detector->last_activity_time().is_null()) {
- allow_delay = false;
- }
- }
- if (allow_delay)
- StartTimer();
- else if (!disabled_for_testing_)
- pref_change_registrar_->prefs()->ClearPref(pref->name());
- }
- void PolicyRecommendationRestorer::RestoreAll() {
- for (const auto& pref_name : pref_names_)
- Restore(false, pref_name);
- }
- void PolicyRecommendationRestorer::StartTimer() {
- // Listen for user activity so that the timer can be reset while the user is
- // active, causing it to fire only when the user remains idle for
- // |kRestoreDelayInMinutes|.
- ui::UserActivityDetector* user_activity_detector =
- ui::UserActivityDetector::Get();
- if (user_activity_detector && !user_activity_detector->HasObserver(this))
- user_activity_detector->AddObserver(this);
- // There should be a separate timer for each pref. However, in the common
- // case of the user changing settings, a single timer is sufficient. This is
- // because a change initiated by the user implies user activity, so that even
- // if there was a separate timer per pref, they would all be reset at that
- // point, causing them to fire at exactly the same time. In the much rarer
- // case of a recommended value changing, a single timer is a close
- // approximation of the behavior that would be obtained by resetting the timer
- // for the affected pref only.
- restore_timer_.Start(FROM_HERE, kRestoreDelayInMinutes,
- base::BindOnce(&PolicyRecommendationRestorer::RestoreAll,
- base::Unretained(this)));
- }
- void PolicyRecommendationRestorer::StopTimer() {
- restore_timer_.Stop();
- if (ui::UserActivityDetector::Get())
- ui::UserActivityDetector::Get()->RemoveObserver(this);
- }
- } // namespace ash
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