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
021
022import org.apache.hadoop.security.authentication.client.Authenticator;
023import org.apache.hadoop.security.authentication.client.KerberosAuthenticator;
024
025/**
026 * A <code>KerberosAuthenticator</code> subclass that fallback to
027 * {@link HttpPseudoAuthenticator}.
028 */
029public class HttpKerberosAuthenticator extends KerberosAuthenticator {
030
031  /**
032   * Returns the fallback authenticator if the server does not use
033   * Kerberos SPNEGO HTTP authentication.
034   *
035   * @return a {@link HttpPseudoAuthenticator} instance.
036   */
037  @Override
038  protected Authenticator getFallBackAuthenticator() {
039    return new HttpPseudoAuthenticator();
040  }
041}