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
019package org.apache.hadoop.fs.http.client;
020
021import org.apache.hadoop.security.UserGroupInformation;
022import org.apache.hadoop.security.authentication.client.PseudoAuthenticator;
023
024import 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 */
030public 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}