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policy_recommendation_restorer.cc
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policy_recommendation_restorer.cc
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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/notreached.h"
#include "base/stl_util.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::TimeDelta::FromMinutes(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