src/chrome/browser/chromeos/login/screens/user_selection_screen.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/chromeos/login/screens/user_selection_screen.h"
   6
   7 #include "base/location.h"
   8 #include "base/logging.h"
   9 #include "base/prefs/pref_service.h"
  10 #include "base/values.h"
  11 #include "chrome/browser/browser_process.h"
  12 #include "chrome/browser/browser_process_platform_part.h"
  13 #include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
  14 #include "chrome/browser/chromeos/login/users/chrome_user_manager.h"
  15 #include "chrome/browser/chromeos/login/users/multi_profile_user_controller.h"
  16 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
  17 #include "chrome/browser/signin/screenlock_bridge.h"
  18 #include "chrome/browser/ui/webui/chromeos/login/l10n_util.h"
  19 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
  20 #include "components/user_manager/user_manager.h"
  21 #include "components/user_manager/user_type.h"
  22 #include "ui/wm/core/user_activity_detector.h"
  23
  24 namespace chromeos {
  25
  26 namespace {
  27
  28 // User dictionary keys.
  29 const char kKeyUsername[] = "username";
  30 const char kKeyDisplayName[] = "displayName";
  31 const char kKeyEmailAddress[] = "emailAddress";
  32 const char kKeyEnterpriseDomain[] = "enterpriseDomain";
  33 const char kKeyPublicAccount[] = "publicAccount";
  34 const char kKeySupervisedUser[] = "supervisedUser";
  35 const char kKeySignedIn[] = "signedIn";
  36 const char kKeyCanRemove[] = "canRemove";
  37 const char kKeyIsOwner[] = "isOwner";
  38 const char kKeyInitialAuthType[] = "initialAuthType";
  39 const char kKeyMultiProfilesAllowed[] = "isMultiProfilesAllowed";
  40 const char kKeyMultiProfilesPolicy[] = "multiProfilesPolicy";
  41 const char kKeyInitialLocales[] = "initialLocales";
  42 const char kKeyInitialLocale[] = "initialLocale";
  43 const char kKeyInitialMultipleRecommendedLocales[] =
  44     "initialMultipleRecommendedLocales";
  45 const char kKeyInitialKeyboardLayout[] = "initialKeyboardLayout";
  46
  47 // Max number of users to show.
  48 // Please keep synced with one in signin_userlist_unittest.cc.
  49 const size_t kMaxUsers = 18;
  50
  51 const int kPasswordClearTimeoutSec = 60;
  52
  53 void AddPublicSessionDetailsToUserDictionaryEntry(
  54     base::DictionaryValue* user_dict,
  55     const std::vector<std::string>* public_session_recommended_locales) {
  56   policy::BrowserPolicyConnectorChromeOS* policy_connector =
  57       g_browser_process->platform_part()->browser_policy_connector_chromeos();
  58
  59   if (policy_connector->IsEnterpriseManaged()) {
  60     user_dict->SetString(kKeyEnterpriseDomain,
  61                          policy_connector->GetEnterpriseDomain());
  62   }
  63
  64   std::vector<std::string> kEmptyRecommendedLocales;
  65   const std::vector<std::string>& recommended_locales =
  66       public_session_recommended_locales ?
  67           *public_session_recommended_locales : kEmptyRecommendedLocales;
  68
  69   // Construct the list of available locales. This list consists of the
  70   // recommended locales, followed by all others.
  71   scoped_ptr<base::ListValue> available_locales =
  72       GetUILanguageList(&recommended_locales, std::string());
  73
  74   // Select the the first recommended locale that is actually available or the
  75   // current UI locale if none of them are available.
  76   const std::string selected_locale = FindMostRelevantLocale(
  77       recommended_locales,
  78       *available_locales.get(),
  79       g_browser_process->GetApplicationLocale());
  80
  81   // Set |kKeyInitialLocales| to the list of available locales.
  82   user_dict->Set(kKeyInitialLocales, available_locales.release());
  83
  84   // Set |kKeyInitialLocale| to the initially selected locale.
  85   user_dict->SetString(kKeyInitialLocale, selected_locale);
  86
  87   // Set |kKeyInitialMultipleRecommendedLocales| to indicate whether the list
  88   // of recommended locales contains at least two entries. This is used to
  89   // decide whether the public session pod expands to its basic form (for zero
  90   // or one recommended locales) or the advanced form (two or more recommended
  91   // locales).
  92   user_dict->SetBoolean(kKeyInitialMultipleRecommendedLocales,
  93                         recommended_locales.size() >= 2);
  94
  95   // Set |kKeyInitialKeyboardLayout| to the current keyboard layout. This
  96   // value will be used temporarily only because the UI immediately requests a
  97   // list of keyboard layouts suitable for the currently selected locale.
  98   user_dict->Set(kKeyInitialKeyboardLayout,
  99                  GetCurrentKeyboardLayout().release());
 100 }
 101
 102 }  // namespace
 103
 104 UserSelectionScreen::UserSelectionScreen() : handler_(NULL) {
 105 }
 106
 107 UserSelectionScreen::~UserSelectionScreen() {
 108   wm::UserActivityDetector* activity_detector = wm::UserActivityDetector::Get();
 109   if (activity_detector->HasObserver(this))
 110     activity_detector->RemoveObserver(this);
 111 }
 112
 113 // static
 114 void UserSelectionScreen::FillUserDictionary(
 115     user_manager::User* user,
 116     bool is_owner,
 117     bool is_signin_to_add,
 118     ScreenlockBridge::LockHandler::AuthType auth_type,
 119     const std::vector<std::string>* public_session_recommended_locales,
 120     base::DictionaryValue* user_dict) {
 121   const std::string& user_id = user->email();
 122   const bool is_public_session =
 123       user->GetType() == user_manager::USER_TYPE_PUBLIC_ACCOUNT;
 124   const bool is_supervised_user =
 125       user->GetType() == user_manager::USER_TYPE_SUPERVISED;
 126
 127   user_dict->SetString(kKeyUsername, user_id);
 128   user_dict->SetString(kKeyEmailAddress, user->display_email());
 129   user_dict->SetString(kKeyDisplayName, user->GetDisplayName());
 130   user_dict->SetBoolean(kKeyPublicAccount, is_public_session);
 131   user_dict->SetBoolean(kKeySupervisedUser, is_supervised_user);
 132   user_dict->SetInteger(kKeyInitialAuthType, auth_type);
 133   user_dict->SetBoolean(kKeySignedIn, user->is_logged_in());
 134   user_dict->SetBoolean(kKeyIsOwner, is_owner);
 135
 136   // Fill in multi-profiles related fields.
 137   if (is_signin_to_add) {
 138     MultiProfileUserController* multi_profile_user_controller =
 139         ChromeUserManager::Get()->GetMultiProfileUserController();
 140     MultiProfileUserController::UserAllowedInSessionReason isUserAllowedReason;
 141     bool isUserAllowed = multi_profile_user_controller->IsUserAllowedInSession(
 142         user_id, &isUserAllowedReason);
 143     user_dict->SetBoolean(kKeyMultiProfilesAllowed, isUserAllowed);
 144
 145     std::string behavior;
 146     switch (isUserAllowedReason) {
 147       case MultiProfileUserController::NOT_ALLOWED_OWNER_AS_SECONDARY:
 148         behavior = MultiProfileUserController::kBehaviorOwnerPrimaryOnly;
 149         break;
 150       default:
 151         behavior = multi_profile_user_controller->GetCachedValue(user_id);
 152     }
 153     user_dict->SetString(kKeyMultiProfilesPolicy, behavior);
 154   } else {
 155     user_dict->SetBoolean(kKeyMultiProfilesAllowed, true);
 156   }
 157
 158   if (is_public_session) {
 159     AddPublicSessionDetailsToUserDictionaryEntry(
 160         user_dict,
 161         public_session_recommended_locales);
 162   }
 163 }
 164
 165 // static
 166 bool UserSelectionScreen::ShouldForceOnlineSignIn(
 167     const user_manager::User* user) {
 168   // Public sessions are always allowed to log in offline.
 169   // Supervised user are allowed to log in offline if their OAuth token status
 170   // is unknown or valid.
 171   // For all other users, force online sign in if:
 172   // * The flag to force online sign-in is set for the user.
 173   // * The user's OAuth token is invalid.
 174   // * The user's OAuth token status is unknown (except supervised users,
 175   //   see above).
 176   if (user->is_logged_in())
 177     return false;
 178
 179   const user_manager::User::OAuthTokenStatus token_status =
 180       user->oauth_token_status();
 181   const bool is_supervised_user =
 182       user->GetType() == user_manager::USER_TYPE_SUPERVISED;
 183   const bool is_public_session =
 184       user->GetType() == user_manager::USER_TYPE_PUBLIC_ACCOUNT;
 185
 186   if (is_supervised_user &&
 187       token_status == user_manager::User::OAUTH_TOKEN_STATUS_UNKNOWN) {
 188     return false;
 189   }
 190
 191   if (is_public_session)
 192     return false;
 193
 194   return user->force_online_signin() ||
 195          (token_status == user_manager::User::OAUTH2_TOKEN_STATUS_INVALID) ||
 196          (token_status == user_manager::User::OAUTH_TOKEN_STATUS_UNKNOWN);
 197 }
 198
 199 void UserSelectionScreen::SetHandler(LoginDisplayWebUIHandler* handler) {
 200   handler_ = handler;
 201 }
 202
 203 void UserSelectionScreen::Init(const user_manager::UserList& users,
 204                                bool show_guest) {
 205   users_ = users;
 206   show_guest_ = show_guest;
 207
 208   wm::UserActivityDetector* activity_detector = wm::UserActivityDetector::Get();
 209   if (!activity_detector->HasObserver(this))
 210     activity_detector->AddObserver(this);
 211 }
 212
 213 void UserSelectionScreen::OnBeforeUserRemoved(const std::string& username) {
 214   for (user_manager::UserList::iterator it = users_.begin(); it != users_.end();
 215        ++it) {
 216     if ((*it)->email() == username) {
 217       users_.erase(it);
 218       break;
 219     }
 220   }
 221 }
 222
 223 void UserSelectionScreen::OnUserRemoved(const std::string& username) {
 224   if (!handler_)
 225     return;
 226
 227   handler_->OnUserRemoved(username);
 228 }
 229
 230 void UserSelectionScreen::OnUserImageChanged(const user_manager::User& user) {
 231   if (!handler_)
 232     return;
 233   handler_->OnUserImageChanged(user);
 234   // TODO(antrim) : updateUserImage(user.email())
 235 }
 236
 237 const user_manager::UserList& UserSelectionScreen::GetUsers() const {
 238   return users_;
 239 }
 240
 241 void UserSelectionScreen::OnPasswordClearTimerExpired() {
 242   if (handler_)
 243     handler_->ClearUserPodPassword();
 244 }
 245
 246 void UserSelectionScreen::OnUserActivity(const ui::Event* event) {
 247   if (!password_clear_timer_.IsRunning()) {
 248     password_clear_timer_.Start(
 249         FROM_HERE,
 250         base::TimeDelta::FromSeconds(kPasswordClearTimeoutSec),
 251         this,
 252         &UserSelectionScreen::OnPasswordClearTimerExpired);
 253   }
 254   password_clear_timer_.Reset();
 255 }
 256
 257 // static
 258 const user_manager::UserList UserSelectionScreen::PrepareUserListForSending(
 259     const user_manager::UserList& users,
 260     std::string owner,
 261     bool is_signin_to_add) {
 262   user_manager::UserList users_to_send;
 263   bool has_owner = owner.size() > 0;
 264   size_t max_non_owner_users = has_owner ? kMaxUsers - 1 : kMaxUsers;
 265   size_t non_owner_count = 0;
 266
 267   for (user_manager::UserList::const_iterator it = users.begin();
 268        it != users.end();
 269        ++it) {
 270     const std::string& user_id = (*it)->email();
 271     bool is_owner = (user_id == owner);
 272     bool is_public_account =
 273         ((*it)->GetType() == user_manager::USER_TYPE_PUBLIC_ACCOUNT);
 274
 275     if ((is_public_account && !is_signin_to_add) || is_owner ||
 276         (!is_public_account && non_owner_count < max_non_owner_users)) {
 277
 278       if (!is_owner)
 279         ++non_owner_count;
 280       if (is_owner && users_to_send.size() > kMaxUsers) {
 281         // Owner is always in the list.
 282         users_to_send.insert(users_to_send.begin() + (kMaxUsers - 1), *it);
 283         while (users_to_send.size() > kMaxUsers)
 284           users_to_send.erase(users_to_send.begin() + kMaxUsers);
 285       } else if (users_to_send.size() < kMaxUsers) {
 286         users_to_send.push_back(*it);
 287       }
 288     }
 289   }
 290   return users_to_send;
 291 }
 292
 293 void UserSelectionScreen::SendUserList() {
 294   base::ListValue users_list;
 295   const user_manager::UserList& users = GetUsers();
 296
 297   // TODO(nkostylev): Move to a separate method in UserManager.
 298   // http://crbug.com/230852
 299   bool single_user = users.size() == 1;
 300   bool is_signin_to_add = LoginDisplayHostImpl::default_host() &&
 301                           user_manager::UserManager::Get()->IsUserLoggedIn();
 302   std::string owner;
 303   chromeos::CrosSettings::Get()->GetString(chromeos::kDeviceOwner, &owner);
 304
 305   policy::BrowserPolicyConnectorChromeOS* connector =
 306       g_browser_process->platform_part()->browser_policy_connector_chromeos();
 307   bool is_enterprise_managed = connector->IsEnterpriseManaged();
 308
 309   const user_manager::UserList users_to_send =
 310       PrepareUserListForSending(users, owner, is_signin_to_add);
 311
 312   user_auth_type_map_.clear();
 313
 314   const std::vector<std::string> kEmptyRecommendedLocales;
 315   for (user_manager::UserList::const_iterator it = users_to_send.begin();
 316        it != users_to_send.end();
 317        ++it) {
 318     const std::string& user_id = (*it)->email();
 319     bool is_owner = (user_id == owner);
 320     const bool is_public_account =
 321         ((*it)->GetType() == user_manager::USER_TYPE_PUBLIC_ACCOUNT);
 322     const ScreenlockBridge::LockHandler::AuthType initial_auth_type =
 323         is_public_account
 324             ? ScreenlockBridge::LockHandler::EXPAND_THEN_USER_CLICK
 325             : (ShouldForceOnlineSignIn(*it)
 326                    ? ScreenlockBridge::LockHandler::ONLINE_SIGN_IN
 327                    : ScreenlockBridge::LockHandler::OFFLINE_PASSWORD);
 328     user_auth_type_map_[user_id] = initial_auth_type;
 329
 330     base::DictionaryValue* user_dict = new base::DictionaryValue();
 331     const std::vector<std::string>* public_session_recommended_locales =
 332         public_session_recommended_locales_.find(user_id) ==
 333             public_session_recommended_locales_.end() ?
 334                 &kEmptyRecommendedLocales :
 335                 &public_session_recommended_locales_[user_id];
 336     FillUserDictionary(*it,
 337                        is_owner,
 338                        is_signin_to_add,
 339                        initial_auth_type,
 340                        public_session_recommended_locales,
 341                        user_dict);
 342     bool signed_in = (*it)->is_logged_in();
 343     // Single user check here is necessary because owner info might not be
 344     // available when running into login screen on first boot.
 345     // See http://crosbug.com/12723
 346     bool can_remove_user =
 347         ((!single_user || is_enterprise_managed) && !user_id.empty() &&
 348          !is_owner && !is_public_account && !signed_in && !is_signin_to_add);
 349     user_dict->SetBoolean(kKeyCanRemove, can_remove_user);
 350     users_list.Append(user_dict);
 351   }
 352
 353   handler_->LoadUsers(users_list, show_guest_);
 354 }
 355
 356 void UserSelectionScreen::HandleGetUsers() {
 357   SendUserList();
 358 }
 359
 360 void UserSelectionScreen::SetAuthType(
 361     const std::string& username,
 362     ScreenlockBridge::LockHandler::AuthType auth_type) {
 363   DCHECK(GetAuthType(username) !=
 364              ScreenlockBridge::LockHandler::FORCE_OFFLINE_PASSWORD ||
 365          auth_type == ScreenlockBridge::LockHandler::FORCE_OFFLINE_PASSWORD);
 366   user_auth_type_map_[username] = auth_type;
 367 }
 368
 369 ScreenlockBridge::LockHandler::AuthType UserSelectionScreen::GetAuthType(
 370     const std::string& username) const {
 371   if (user_auth_type_map_.find(username) == user_auth_type_map_.end())
 372     return ScreenlockBridge::LockHandler::OFFLINE_PASSWORD;
 373   return user_auth_type_map_.find(username)->second;
 374 }
 375
 376 }  // namespace chromeos