org.apache.hadoop.hdfs.web.KerberosUgiAuthenticator.java Source code

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Here is the source code for org.apache.hadoop.hdfs.web.KerberosUgiAuthenticator.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hdfs.web;

import java.io.IOException;

import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.authentication.client.Authenticator;
import org.apache.hadoop.security.authentication.client.KerberosAuthenticator;
import org.apache.hadoop.security.authentication.client.PseudoAuthenticator;

/**
 * Use UserGroupInformation as a fallback authenticator
 * if the server does not use Kerberos SPNEGO HTTP authentication.
 */
public class KerberosUgiAuthenticator extends KerberosAuthenticator {
    @Override
    protected Authenticator getFallBackAuthenticator() {
        return new PseudoAuthenticator() {
            @Override
            protected String getUserName() {
                try {
                    return UserGroupInformation.getLoginUser().getUserName();
                } catch (IOException e) {
                    throw new SecurityException("Failed to obtain current username", e);
                }
            }
        };
    }
}