blob: 2e6e52300a0b8529a03d5cabd1fa6c5d898c3ce9 [file] [log] [blame]
// Copyright (c) 2012 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 <memory>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "components/prefs/pref_change_registrar.h"
#include "ui/base/user_activity/user_activity_observer.h"
class PrefRegistrySimple;
namespace chromeos {
// Enforces a session length limit by terminating the session when the limit is
// reached.
class SessionLengthLimiter : public ui::UserActivityObserver {
class Delegate {
virtual ~Delegate();
virtual const base::TimeTicks GetCurrentTime() const = 0;
virtual void StopSession() = 0;
// Registers preferences.
static void RegisterPrefs(PrefRegistrySimple* registry);
SessionLengthLimiter(Delegate* delegate, bool browser_restarted);
~SessionLengthLimiter() override;
// Returns the duration between |session_start_time_| and now if there is a
// valid |session_start_time_|. Otherwise, returns 0.
base::TimeDelta GetSessionDuration() const;
// ui::UserActivityObserver:
void OnUserActivity(const ui::Event* event) override;
// Attempt to restore the session start time and the flag indicating user
// activity from local state. Return |true| if the restore is successful.
bool RestoreStateAfterCrash();
// Update the session start time if possible:
// * If instructed to wait for initial user activity, the session start time
// advances every time this method is called as long as no user activity has
// occurred yet. The time is not persisted in local state.
// * If instructed not to wait for initial user activity, the session start
// time is set and persisted in local state the first time this method is
// called.
// The pref indicating whether to wait for initial user activity may change at
// any time, switching between the two behaviors.
void UpdateSessionStartTime();
void UpdateLimit();
base::ThreadChecker thread_checker_;
std::unique_ptr<Delegate> delegate_;
PrefChangeRegistrar pref_change_registrar_;
std::unique_ptr<base::OneShotTimer> timer_;
base::TimeTicks session_start_time_;
bool user_activity_seen_;
} // namespace chromeos