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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.jetspeed.profiler.rules.impl;
18  
19  import java.security.Principal;
20  
21  import javax.security.auth.Subject;
22  
23  import org.apache.commons.logging.Log;
24  import org.apache.commons.logging.LogFactory;
25  import org.apache.jetspeed.profiler.rules.RuleCriterion;
26  import org.apache.jetspeed.profiler.rules.RuleCriterionResolver;
27  import org.apache.jetspeed.request.RequestContext;
28  import org.apache.jetspeed.security.SecurityHelper;
29  import org.apache.jetspeed.security.UserPrincipal;
30  
31  /***
32   * Standard Jetspeed-1 User resolver.
33   * It first looks at the value in the criterion record.
34   * If it is null, it then falls back to a request parameter.
35   * If it is null it gives up and returns null allowing subclasses
36   * to continue processing.
37   * 
38   * @author <a href="mailto:taylor@apache.org">David Sean Taylor</a>
39   * @version $Id: UserCriterionResolver.java 516448 2007-03-09 16:25:47Z ate $
40   */
41  public class UserCriterionResolver
42      extends StandardResolver
43      implements RuleCriterionResolver
44  {
45      protected final static Log log = LogFactory.getLog(UserCriterionResolver.class);
46      
47      /* (non-Javadoc)
48       * @see org.apache.jetspeed.profiler.rules.RuleCriterionResolver#resolve(org.apache.jetspeed.request.RequestContext, org.apache.jetspeed.profiler.rules.RuleCriterion)
49       */    
50      public String resolve(RequestContext context, RuleCriterion criterion)
51      {
52          String value = super.resolve(context, criterion);
53          if (value != null)
54          {
55              return value;
56          }
57              
58          Subject subject = context.getSubject();
59          if (subject == null)
60          {
61              String msg = "Invalid (null) Subject in request pipeline";
62              log.error(msg);
63              return null;
64          }
65              
66          Principal principal = SecurityHelper.getPrincipal(subject, UserPrincipal.class);
67          if (principal != null)
68          {
69              return principal.getName();              
70          }
71          return null;
72       }
73      
74      /* (non-Javadoc)
75       * @see org.apache.jetspeed.profiler.rules.RuleCriterionResolver#isControl()
76       */
77      public boolean isControl(RuleCriterion criterion)
78      {
79          return true;
80      }
81      
82      
83  }