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    
019    package org.apache.hadoop.fs.http.client;
020    
021    import org.apache.hadoop.security.UserGroupInformation;
022    import org.apache.hadoop.security.authentication.client.PseudoAuthenticator;
023    
024    import java.io.IOException;
025    
026    /**
027     * A <code>PseudoAuthenticator</code> subclass that uses FileSystemAccess's
028     * <code>UserGroupInformation</code> to obtain the client user name (the UGI's login user).
029     */
030    public class HttpPseudoAuthenticator extends PseudoAuthenticator {
031    
032      /**
033       * Return the client user name.
034       *
035       * @return the client user name.
036       */
037      @Override
038      protected String getUserName() {
039        try {
040          return UserGroupInformation.getLoginUser().getUserName();
041        } catch (IOException ex) {
042          throw new SecurityException("Could not obtain current user, " + ex.getMessage(), ex);
043        }
044      }
045    }