001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     * 
010     *      http://www.apache.org/licenses/LICENSE-2.0
011     * 
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.oozie.action.hadoop;
019    
020    import org.apache.hadoop.security.UserGroupInformation;
021    import org.apache.oozie.action.hadoop.DoAs;
022    
023    import java.security.PrivilegedExceptionAction;
024    import java.util.concurrent.Callable;
025    
026    //TODO this class goes away when doing 20.100+ only
027    
028    //TODO this class is for testing, but is here to allow selective compilation
029    public class KerberosDoAs extends DoAs {
030    
031        public Void call() throws Exception {
032            final Callable<Void> callable = getCallable();
033            UserGroupInformation ugi = UserGroupInformation.createProxyUser(getUser(), UserGroupInformation.getLoginUser());
034            ugi.doAs(new PrivilegedExceptionAction<Void>() {
035                public Void run() throws Exception {
036                    callable.call();
037                    return null;
038                }
039            });
040            return null;
041        }
042    }