001    /*
002     * Copyright 2008-2009 The Kuali Foundation
003     * 
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     * 
008     * http://www.opensource.org/licenses/ecl2.php
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.kim.service.impl;
017    
018    import javax.servlet.http.HttpServletRequest;
019    import org.kuali.rice.kim.api.identity.AuthenticationService;
020    
021    import org.kuali.student.common.util.security.UserWithId;
022    import org.springframework.security.core.Authentication;
023    import org.springframework.security.core.context.SecurityContextHolder;
024    import org.springframework.security.core.userdetails.UserDetails;
025    
026    public class AuthenticationServiceImpl implements AuthenticationService {
027        
028            public String getPrincipalName(HttpServletRequest request) {
029                String username=null;
030                Authentication auth = SecurityContextHolder.getContext().getAuthentication();
031                
032                if(auth!=null){
033                Object obj = auth.getPrincipal();
034                if(obj instanceof UserWithId){
035                    //This is actually the user Id
036                    username = ((UserWithId)obj).getUserId();
037                }else if (obj instanceof UserDetails) {
038                    username = ((UserDetails)obj).getUsername();
039                } else {
040                    username = request.getRemoteUser();
041                }
042            }
043                return username;
044            }
045    }