001    /**
002     * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003     * Licensed under the Apache License, Version 2.0 (the "License");
004     * you may not use this file except in compliance with the License.
005     * You may obtain a copy of the License at
006     *
007     *   http://www.apache.org/licenses/LICENSE-2.0
008     *
009     *  Unless required by applicable law or agreed to in writing, software
010     *  distributed under the License is distributed on an "AS IS" BASIS,
011     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012     *  See the License for the specific language governing permissions and
013     *  limitations under the License. See accompanying LICENSE file.
014     */
015    package org.apache.oozie.action.hadoop;
016    
017    import org.apache.hadoop.security.UserGroupInformation;
018    import org.apache.oozie.action.hadoop.DoAs;
019    
020    import java.security.PrivilegedExceptionAction;
021    import java.util.concurrent.Callable;
022    
023    //TODO this class goes away when doing 20.100+ only
024    
025    //TODO this class is for testing, but is here to allow selective compilation
026    public class KerberosDoAs extends DoAs {
027    
028        public Void call() throws Exception {
029            final Callable<Void> callable = getCallable();
030            UserGroupInformation ugi = UserGroupInformation.createProxyUser(getUser(), UserGroupInformation.getLoginUser());
031            ugi.doAs(new PrivilegedExceptionAction<Void>() {
032                public Void run() throws Exception {
033                    callable.call();
034                    return null;
035                }
036            });
037            return null;
038        }
039    }