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.classification.InterfaceAudience;
022    import org.apache.hadoop.security.UserGroupInformation;
023    import org.apache.hadoop.security.authentication.client.PseudoAuthenticator;
024    
025    import java.io.IOException;
026    
027    /**
028     * A <code>PseudoAuthenticator</code> subclass that uses FileSystemAccess's
029     * <code>UserGroupInformation</code> to obtain the client user name (the UGI's login user).
030     */
031    @InterfaceAudience.Private
032    public class HttpFSPseudoAuthenticator extends PseudoAuthenticator {
033    
034      /**
035       * Return the client user name.
036       *
037       * @return the client user name.
038       */
039      @Override
040      protected String getUserName() {
041        try {
042          return UserGroupInformation.getLoginUser().getUserName();
043        } catch (IOException ex) {
044          throw new SecurityException("Could not obtain current user, " + ex.getMessage(), ex);
045        }
046      }
047    }