/*

  * Copyright 2008-2009 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.opensource.org/licenses/ecl2.php

  * 

  * 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.rice.kim.service.impl;

 import javax.servlet.http.HttpServletRequest;

 import org.kuali.rice.kim.service.AuthenticationService;

 import org.kuali.student.common.util.security.UserWithId;

 import org.springframework.security.Authentication;

 import org.springframework.security.context.SecurityContextHolder;

 import org.springframework.security.userdetails.UserDetails;

 public class AuthenticationServiceImpl implements AuthenticationService {

         public String getPrincipalName(HttpServletRequest request) {

             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 = request.getRemoteUser();

             }

         }

             return username;

         }

 }