Add LoginState class to src/chromeos/login

chromeos/login/login_state.cc

+// Copyright (c) 2013 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 "chromeos/login/login_state.h"
+
+#include "base/chromeos/chromeos_version.h"
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "chromeos/chromeos_switches.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+
+namespace chromeos {
+
+namespace {
+
+// When running a Chrome OS build outside of a device (i.e. on a developer's
+// workstation) and not running as login-manager, pretend like we're always
+// logged in.
+bool AlwaysLoggedIn() {
+  return !base::chromeos::IsRunningOnChromeOS() &&
+      !CommandLine::ForCurrentProcess()->HasSwitch(switches::kLoginManager);
+}
+
+}  // namespace
+
+static LoginState* g_login_state = NULL;
+
+// static
+void LoginState::Initialize() {
+  CHECK(!g_login_state);
+  g_login_state = new LoginState();
+}
+
+// static
+void LoginState::Shutdown() {
+  CHECK(g_login_state);
+  delete g_login_state;
+  g_login_state = NULL;
+}
+
+// static
+LoginState* LoginState::Get() {
+  CHECK(g_login_state) << "LoginState::Get() called before Initialize()";
+  return g_login_state;
+}
+
+// static
+bool LoginState::IsInitialized() {
+  return !!g_login_state;
+}
+
+void LoginState::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void LoginState::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+void LoginState::SetLoginState(LoginState::State state) {
+  if (state == state_)
+    return;
+  VLOG(1) << "Login State: " << state;
+  state_ = state;
+  NotifyObservers();
+}
+
+LoginState::State LoginState::GetLoginState() const {
+  if (state_ == LOGGED_IN_OOBE || state_ == LOGGED_IN_NONE) {
+    if (AlwaysLoggedIn()) {
+      // Fake a login state when running in a dev environment.
+      if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kGuestSession))
+        return LOGGED_IN_GUEST;
+      else
+        return LOGGED_IN_OWNER;
+    }
+    return state_;
+  }
+  // |state_| may get set before |session_started_|.
+  if (!session_started_)
+    return LOGGED_IN_NONE;
+  if (screen_locked_)
+    return LOGGED_IN_LOCKED;
+  return state_;
+}
+
+bool LoginState::IsUserLoggedIn() {
+  State login_state = GetLoginState();
+  if (login_state == LOGGED_IN_OOBE || login_state == LOGGED_IN_NONE)
+    return false;
+  return true;
+}
+
+void LoginState::SetSessionStarted(bool session_started) {
+  session_started_ = session_started;
+  NotifyObservers();
+}
+
+bool LoginState::IsSessionStarted() const {
+  return session_started_;
+}
+
+// Private methods
+
+LoginState::LoginState() : state_(LOGGED_IN_OOBE),

[xiyuan, 2013/04/04 21:24:54]

nit: should it be initialized to LOGGED_IN_UNKNOWN?

[stevenjb, 2013/04/04 21:35:47]

I got rid of LOGGED_IN_UNKNOWN, it doesn't really make any sense. If we query
LoginState before the Wizard sets it, we should default to OOBE. Thanks for
pointing that out.

+                           session_started_(false),
+                           screen_locked_(false) {
+  DBusThreadManager::Get()->GetSessionManagerClient()->AddObserver(this);
+}
+
+LoginState::~LoginState() {
+  DBusThreadManager::Get()->GetSessionManagerClient()->RemoveObserver(this);
+}
+
+void LoginState::LockScreen() {
+  screen_locked_ = true;
+  NotifyObservers();
+}
+
+void LoginState::UnlockScreen() {
+  screen_locked_ = false;
+  NotifyObservers();
+}
+
+void LoginState::NotifyObservers() {
+  FOR_EACH_OBSERVER(LoginState::Observer, observer_list_,
+                    LoginStateChanged(GetLoginState()));
+}
+
+}  // namespace chromeos