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1   /*
2    * Copyright 2004 Carlos Sanchez.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package net.sf.oness.common.model.security;
17  
18  import net.sf.acegisecurity.context.Context;
19  import net.sf.acegisecurity.context.ContextHolder;
20  import net.sf.acegisecurity.context.SecureContext;
21  
22  /***
23   * Class that encapsulates security code
24   * 
25   * @author Carlos Sanchez
26   * @version $Revision: 1.3 $
27   */
28  public class SecurityHelper {
29  
30      /***
31       * Get the userName of the current user
32       * 
33       * @return the userName or null if it hasn't been authenticated
34       */
35      public static String getUserName() {
36          Context context = ContextHolder.getContext();
37          if (context instanceof SecureContext) {
38              SecureContext secureContext = (SecureContext) context;
39              return (String) secureContext.getAuthentication().getPrincipal();
40          }
41          return null;
42      }
43  
44  }