ImpersonatingHadoopAuthenticator.java

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.common.security.authentication;

import org.apache.hadoop.security.UserGroupInformation;

import java.io.IOException;
import java.util.Objects;

public class ImpersonatingHadoopAuthenticator implements HadoopAuthenticator {

    private final HadoopAuthenticator delegate;
    private final String username;
    private UserGroupInformation ugi;

    public ImpersonatingHadoopAuthenticator(HadoopAuthenticator delegate, String username) {
        this.delegate = Objects.requireNonNull(delegate);
        this.username = Objects.requireNonNull(username);
    }

    @Override
    public synchronized UserGroupInformation getUGI() throws IOException {
        if (ugi == null) {
            ugi = UserGroupInformation.createProxyUser(username, delegate.getUGI());
        }
        return ugi;
    }
}