/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community License, Version 2.0 (the "License"); you may

  * not use this file except in compliance with the License. You may

  * obtain a copy of the License at

  *

  * http://www.osedu.org/licenses/ECL-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an "AS IS"

  * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

  * or implied. See the License for the specific language governing

  * permissions and limitations under the License.

  */

 package org.kuali.student.common.util.security;

 import org.springframework.security.Authentication;

 import org.springframework.security.context.SecurityContextHolder;

 import org.springframework.security.userdetails.UserDetails;

 public class SecurityUtils {

         /** 

          * This can be used to get the current user id from security context

          * 

          * @return userId

          */

         public static String getCurrentUserId() {

         String username=null;

                 Authentication auth = SecurityContextHolder.getContext().getAuthentication();

         if(auth!=null){

                 Object obj = auth.getPrincipal();

                 if(obj instanceof UserWithId){

                         //This is actually the user Id

                         username = ((UserWithId)obj).getUserId();

                 }else if (obj instanceof UserDetails) {

                     username = ((UserDetails)obj).getUsername();

             } else {

                     username = obj.toString();

             }

         }

                 return username;

         }

         public static String getPrincipalUserName(){

                 String username = "unknown";

                 Authentication auth = SecurityContextHolder.getContext().getAuthentication();

                 if (auth != null) {

                         Object obj = auth.getPrincipal();

                     if (obj instanceof UserDetails) {

                             username = ((UserDetails)obj).getUsername();

                     } else {

                         username = obj.toString();

                     }

                 }

             return username;

         }

 }