org.apache.flume.auth.SimpleAuthenticator.java Source code

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Here is the source code for org.apache.flume.auth.SimpleAuthenticator.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.flume.auth;

import org.apache.hadoop.security.UserGroupInformation;

import java.io.IOException;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.util.HashMap;
import java.util.Map;

/**
 * A no-op authenticator, which does not authenticate and executes
 * without any authenticated privileges
 */
class SimpleAuthenticator implements FlumeAuthenticator {
    private SimpleAuthenticator() {
    }

    private static class SimpleAuthenticatorHolder {
        public static SimpleAuthenticator authenticator = new SimpleAuthenticator();
    }

    public static SimpleAuthenticator getSimpleAuthenticator() {
        return SimpleAuthenticatorHolder.authenticator;
    }

    private Map<String, PrivilegedExecutor> proxyCache = new HashMap<String, PrivilegedExecutor>();

    @Override
    public <T> T execute(PrivilegedExceptionAction<T> action) throws Exception {
        return action.run();
    }

    @Override
    public <T> T execute(PrivilegedAction<T> action) {
        return action.run();
    }

    @Override
    public synchronized PrivilegedExecutor proxyAs(String proxyUserName) {
        if (proxyUserName == null || proxyUserName.isEmpty()) {
            return this;
        }
        if (proxyCache.get(proxyUserName) == null) {
            UserGroupInformation proxyUgi;
            try {
                proxyUgi = UserGroupInformation.createProxyUser(proxyUserName,
                        UserGroupInformation.getCurrentUser());
            } catch (IOException e) {
                throw new SecurityException("Unable to create proxy User", e);
            }
            proxyCache.put(proxyUserName, new UGIExecutor(proxyUgi));
        }
        return proxyCache.get(proxyUserName);
    }

    @Override
    public boolean isAuthenticated() {
        return false;
    }

    @Override
    public void startCredentialRefresher() {
        // no-op
    }

}