/**
    * 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.core.Authentication;
  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.core.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;
  	}
  	/** 
  	 * Add this method to use the new method as specified in Enr-1.0 (ks-1.3) as this method is used in CM
  	 * 
  	 * @return principal id
  	 */
  	@Deprecated
  	public static String getCurrentPrincipalId() {
  		return getCurrentUserId();
  	}
  	
  	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;
  	}
  
  	/**
  	 * This can be used to get the current user's principal name from security context
  	 * 
  	 * @return principal name
  	 */
  	@Deprecated
  	public static String getCurrentPrincipalName(){
  	    return getPrincipalUserName();
  	}
  }