Make the user manager UI not permit guest mode when preferences dictate

chrome/browser/ui/webui/signin/user_manager_screen_handler.cc

 // Copyright 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 "chrome/browser/ui/webui/signin/user_manager_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/value_conversions.h"
@@ skipping 126 matching lines @@
   ProfileInfoCache& info_cache =
       g_browser_process->profile_manager()->GetProfileInfoCache();
   const size_t profile_index = GetIndexOfProfileWithEmailAndName(
       info_cache, base::UTF8ToUTF16(email), base::string16());
   Profile* profile = g_browser_process->profile_manager()
       ->GetProfileByPath(info_cache.GetPathOfProfileAtIndex(profile_index));
   return extensions::ScreenlockPrivateEventRouter::GetFactoryInstance()->Get(
       profile);
 }
 
+bool IsGuestModeEnabled() {
+  PrefService* service = g_browser_process->local_state();
+  DCHECK(service);
+  return service->GetBoolean(prefs::kBrowserGuestModeEnabled);
+}
+
 }  // namespace
 
 // ProfileUpdateObserver ------------------------------------------------------
 
 class UserManagerScreenHandler::ProfileUpdateObserver
     : public ProfileInfoCacheObserver {
  public:
   ProfileUpdateObserver(
       ProfileManager* profile_manager, UserManagerScreenHandler* handler)
       : profile_manager_(profile_manager),
@@ skipping 116 matching lines @@
   const size_t profile_index = GetIndexOfProfileWithEmailAndName(
       info_cache, base::UTF8ToUTF16(user_email), base::string16());
   DCHECK_LT(profile_index, info_cache.GetNumberOfProfiles());
 
   authenticating_profile_index_ = profile_index;
   ReportAuthenticationResult(true, ProfileMetrics::AUTH_LOCAL);
 }
 
 void UserManagerScreenHandler::HandleInitialize(const base::ListValue* args) {
   SendUserList();
-  web_ui()->CallJavascriptFunction("cr.ui.Oobe.showUserManagerScreen");
+  web_ui()->CallJavascriptFunction("cr.ui.Oobe.showUserManagerScreen",
+      base::FundamentalValue(IsGuestModeEnabled()));
   desktop_type_ = chrome::GetHostDesktopTypeForNativeView(
       web_ui()->GetWebContents()->GetNativeView());
 
   ScreenlockBridge::Get()->SetLockHandler(this);
 }
 
 void UserManagerScreenHandler::HandleAddUser(const base::ListValue* args) {
   profiles::CreateAndSwitchToNewProfile(desktop_type_,
                                         base::Bind(&OnSwitchToProfileComplete),
                                         ProfileMetrics::ADD_NEW_USER_MANAGER);
@@ skipping 67 matching lines @@
     return;
 
   g_browser_process->profile_manager()->ScheduleProfileForDeletion(
       profile_path,
       base::Bind(&OpenNewWindowForProfile, desktop_type_));
   ProfileMetrics::LogProfileDeleteUser(
       ProfileMetrics::DELETE_PROFILE_USER_MANAGER);
 }
 
 void UserManagerScreenHandler::HandleLaunchGuest(const base::ListValue* args) {
-  profiles::SwitchToGuestProfile(desktop_type_,
-                                 base::Bind(&OnSwitchToProfileComplete));
-  ProfileMetrics::LogProfileSwitchUser(ProfileMetrics::SWITCH_PROFILE_GUEST);
+  if (IsGuestModeEnabled()) {
+    profiles::SwitchToGuestProfile(desktop_type_,
+                                   base::Bind(&OnSwitchToProfileComplete));
+    ProfileMetrics::LogProfileSwitchUser(ProfileMetrics::SWITCH_PROFILE_GUEST);
+  } else {
+    // The UI should have prevented the user from allowing the selection of
+    // guest mode.
+    NOTREACHED();
+  }
 }
 
 void UserManagerScreenHandler::HandleLaunchUser(const base::ListValue* args) {
   base::string16 email_address;
   base::string16 display_name;
 
   if (!args->GetString(0, &email_address) ||
       !args->GetString(1, &display_name)) {
     NOTREACHED();
     return;
@@ skipping 233 matching lines @@
         kKeyAvatarUrl, GetAvatarImageAtIndex(i, info_cache));
 
     // The row of user pods should display the active user first.
     if (is_active_user)
       users_list.Insert(0, profile_value);
     else
       users_list.Append(profile_value);
   }
 
   web_ui()->CallJavascriptFunction("login.AccountPickerScreen.loadUsers",
-    users_list, base::FundamentalValue(true));
+      users_list, base::FundamentalValue(IsGuestModeEnabled()));
 }
 
 void UserManagerScreenHandler::ReportAuthenticationResult(
     bool success,
     ProfileMetrics::ProfileAuth auth) {
   ProfileMetrics::LogProfileAuthResult(auth);
   password_attempt_.clear();
 
   if (success) {
     ProfileInfoCache& info_cache =
         g_browser_process->profile_manager()->GetProfileInfoCache();
     info_cache.SetProfileSigninRequiredAtIndex(
         authenticating_profile_index_, false);
     base::FilePath path = info_cache.GetPathOfProfileAtIndex(
         authenticating_profile_index_);
     profiles::SwitchToProfile(path, desktop_type_, true,
                               base::Bind(&OnSwitchToProfileComplete),
                               ProfileMetrics::SWITCH_PROFILE_UNLOCK);
   } else {
     web_ui()->CallJavascriptFunction(
         "cr.ui.Oobe.showSignInError",
         base::FundamentalValue(0),
         base::StringValue(
             l10n_util::GetStringUTF8(IDS_LOGIN_ERROR_AUTHENTICATING)),
         base::StringValue(""),
         base::FundamentalValue(0));
   }
 }