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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/policy/off_hours/device_off_hours_controller.h"
#include <optional>
#include <string>
#include <tuple>
#include <utility>
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/time/default_clock.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "chrome/browser/ash/login/users/chrome_user_manager_util.h"
#include "chrome/browser/ash/policy/off_hours/off_hours_proto_parser.h"
#include "chrome/browser/ash/settings/device_settings_service.h"
#include "chromeos/ash/components/dbus/dbus_thread_manager.h"
#include "chromeos/ash/components/policy/weekly_time/time_utils.h"
#include "components/prefs/pref_value_map.h"
#include "components/user_manager/user.h"
#include "components/user_manager/user_manager.h"
namespace policy::off_hours {
namespace em = ::enterprise_management;
DeviceOffHoursController::DeviceOffHoursController()
: timer_(std::make_unique<base::WallClockTimer>()),
clock_(base::DefaultClock::GetInstance()) {
auto* system_clock_client = ash::SystemClockClient::Get();
if (system_clock_client) {
system_clock_client->AddObserver(this);
system_clock_client->WaitForServiceToBeAvailable(
base::BindOnce(&DeviceOffHoursController::SystemClockInitiallyAvailable,
weak_ptr_factory_.GetWeakPtr()));
}
}
DeviceOffHoursController::~DeviceOffHoursController() {
if (ash::SystemClockClient::Get())
ash::SystemClockClient::Get()->RemoveObserver(this);
}
void DeviceOffHoursController::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void DeviceOffHoursController::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
void DeviceOffHoursController::SetClockForTesting(
base::Clock* clock,
const base::TickClock* timer_clock) {
clock_ = clock;
timer_ = std::make_unique<base::WallClockTimer>(clock, timer_clock);
}
bool DeviceOffHoursController::IsCurrentSessionAllowedOnlyForOffHours() const {
if (!is_off_hours_mode())
return false;
const user_manager::UserManager* user_manager =
user_manager::UserManager::Get();
const user_manager::UserList& logged_in_users =
user_manager->GetLoggedInUsers();
user_manager::UserList users_to_check;
for (user_manager::User* user : logged_in_users) {
if (user->GetType() == user_manager::UserType::kRegular ||
user->GetType() == user_manager::UserType::kGuest ||
user->GetType() == user_manager::UserType::kChild) {
users_to_check.push_back(user);
}
}
if (users_to_check.empty())
return false;
// If at least one logged in user won't be allowed after OffHours,
// the session will be terminated.
return !ash::chrome_user_manager_util::AreAllUsersAllowed(
users_to_check, device_settings_proto_);
}
void DeviceOffHoursController::UpdateOffHoursPolicy(
const em::ChromeDeviceSettingsProto& device_settings_proto) {
device_settings_proto_ = device_settings_proto;
std::vector<WeeklyTimeInterval> off_hours_intervals;
if (device_settings_proto.has_device_off_hours()) {
const em::DeviceOffHoursProto& container(
device_settings_proto.device_off_hours());
std::optional<std::string> timezone = ExtractTimezoneFromProto(container);
if (timezone) {
off_hours_intervals = weekly_time_utils::ConvertIntervalsToGmt(
ExtractWeeklyTimeIntervalsFromProto(container, *timezone, clock_));
}
}
off_hours_intervals_.swap(off_hours_intervals);
UpdateOffHoursMode();
}
void DeviceOffHoursController::NotifyOffHoursEndTimeChanged() const {
VLOG(1) << "OffHours end time is changed to " << off_hours_end_time_;
for (auto& observer : observers_)
observer.OnOffHoursEndTimeChanged();
}
void DeviceOffHoursController::OffHoursModeIsChanged() const {
VLOG(1) << "OffHours mode is changed to " << off_hours_mode_;
ash::DeviceSettingsService::Get()->Load();
}
void DeviceOffHoursController::UpdateOffHoursMode() {
if (off_hours_intervals_.empty() || !is_clock_network_synchronized_) {
if (!is_clock_network_synchronized_) {
VLOG(1) << "The system clock isn't network synchronized. OffHours mode "
"is unavailable.";
}
SetOffHoursEndTime(base::Time{});
StopOffHoursTimer();
SetOffHoursMode(false);
return;
}
namespace wtu = weekly_time_utils;
const base::Time now = clock_->Now();
const bool in_interval = wtu::Contains(now, off_hours_intervals_);
const std::optional<base::Time> update_time =
wtu::GetNextEventTime(now, off_hours_intervals_);
// weekly off_hours_intervals_ is not empty -> update_time has a value
DCHECK(update_time);
SetOffHoursEndTime(in_interval ? update_time.value() : base::Time{});
StartOffHoursTimer(update_time.value());
SetOffHoursMode(in_interval);
}
void DeviceOffHoursController::SetOffHoursEndTime(
base::Time off_hours_end_time) {
if (off_hours_end_time == off_hours_end_time_)
return;
off_hours_end_time_ = off_hours_end_time;
NotifyOffHoursEndTimeChanged();
}
void DeviceOffHoursController::SetOffHoursMode(bool off_hours_enabled) {
if (off_hours_mode_ == off_hours_enabled)
return;
off_hours_mode_ = off_hours_enabled;
DVLOG(1) << "OffHours mode: " << off_hours_mode_;
if (!off_hours_mode_)
SetOffHoursEndTime(base::Time());
OffHoursModeIsChanged();
}
void DeviceOffHoursController::StartOffHoursTimer(base::Time update_time) {
DVLOG(1) << "OffHours mode timer starts with run time " << update_time;
timer_->Start(FROM_HERE, update_time,
base::BindOnce(&DeviceOffHoursController::UpdateOffHoursMode,
weak_ptr_factory_.GetWeakPtr()));
}
void DeviceOffHoursController::StopOffHoursTimer() {
timer_->Stop();
}
void DeviceOffHoursController::SystemClockUpdated() {
// Triggered when the device time is changed. When it happens the "OffHours"
// mode could be changed too, because "OffHours" mode directly depends on the
// current device time. Ask SystemClockClient to update information about the
// system time synchronization with the network time asynchronously.
// Information will be received by NetworkSynchronizationUpdated method.
ash::SystemClockClient::Get()->GetLastSyncInfo(
base::BindOnce(&DeviceOffHoursController::NetworkSynchronizationUpdated,
weak_ptr_factory_.GetWeakPtr()));
}
void DeviceOffHoursController::SystemClockInitiallyAvailable(
bool service_is_available) {
if (!service_is_available)
return;
ash::SystemClockClient::Get()->GetLastSyncInfo(
base::BindOnce(&DeviceOffHoursController::NetworkSynchronizationUpdated,
weak_ptr_factory_.GetWeakPtr()));
}
void DeviceOffHoursController::NetworkSynchronizationUpdated(
bool network_synchronized) {
// Triggered when information about the system time synchronization with
// network is received.
is_clock_network_synchronized_ = network_synchronized;
UpdateOffHoursMode();
}
} // namespace policy::off_hours
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