/*
    * 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.api.identity.AuthenticationService;
  
  import org.kuali.student.common.util.security.UserWithId;
  import org.springframework.security.core.Authentication;
  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.core.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;
  	}
  }