org.apache.hadoop.gateway.dispatch.KnoxSpnegoAuthScheme.java Source code

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Here is the source code for org.apache.hadoop.gateway.dispatch.KnoxSpnegoAuthScheme.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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.gateway.dispatch;

import org.apache.http.impl.auth.SPNegoScheme;
import org.ietf.jgss.GSSException;

public class KnoxSpnegoAuthScheme extends SPNegoScheme {

    private static long nano = Long.MIN_VALUE;

    public KnoxSpnegoAuthScheme(boolean stripPort) {
        super(stripPort);
    }

    public KnoxSpnegoAuthScheme() {
        super();
    }

    @Override
    protected byte[] generateToken(final byte[] input, final String authServer) throws GSSException {
        // This is done to avoid issues with Keberos service ticket replay detection on the service side.
        synchronized (KnoxSpnegoAuthScheme.class) {
            long now;
            // This just insures that the system clock has advanced to a different nanosecond.
            // Kerberos uses microsecond resolution and 1ms=1000ns.
            while ((now = System.nanoTime()) == nano) {
                try {
                    Thread.sleep(0);
                } catch (InterruptedException e) {
                    // Ignore it.
                }
            }
            nano = now;
            return super.generateToken(input, authServer);
        }
    }

}