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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.geronimo.tomcat.valve;
   18   
   19   import java.io.IOException;
   20   
   21   import javax.servlet.ServletException;
   22   import javax.security.auth.Subject;
   23   
   24   import org.apache.catalina.valves.ValveBase;
   25   import org.apache.catalina.connector.Request;
   26   import org.apache.catalina.connector.Response;
   27   import org.apache.geronimo.security.ContextManager;
   28   import org.apache.geronimo.security.Callers;
   29   
   30   /**
   31    * @version $Rev: 476049 $ $Date: 2006-11-16 20:35:17 -0800 (Thu, 16 Nov 2006) $
   32    */
   33   public class DefaultSubjectValve extends ValveBase {
   34   
   35       private final Subject defaultSubject;
   36   
   37       public DefaultSubjectValve(Subject defaultSubject) {
   38           this.defaultSubject = defaultSubject;
   39       }
   40   
   41       public void invoke(Request request, Response response) throws IOException, ServletException {
   42           Callers oldCallers = null;
   43           boolean setSubject = false;
   44           if (defaultSubject != null) {
   45               oldCallers = ContextManager.getCallers();
   46               setSubject = oldCallers == null || oldCallers.getCurrentCaller() == null;
   47           }
   48           if (setSubject) {
   49               ContextManager.setCallers(defaultSubject, defaultSubject);
   50               try {
   51                   getNext().invoke(request, response);
   52               } finally {
   53                   ContextManager.popCallers(oldCallers);
   54               }
   55           } else {
   56               getNext().invoke(request, response);
   57           }
   58   
   59       }
   60   }

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