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Common utilities shared in Alluxio core modules

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.security.user;

import alluxio.conf.AlluxioConfiguration;
import alluxio.conf.PropertyKey;
import alluxio.exception.status.UnauthenticatedException;
import alluxio.security.User;
import alluxio.security.authentication.AuthType;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.security.auth.Subject;

/**
 * A UserState implementation which does nothing.
 */
public class NoopUserState extends BaseUserState {
  private static final Logger LOG = LoggerFactory.getLogger(NoopUserState.class);
  private static final User NOOP_USER = new User("");

  /**
   * Factory class to create the user state.
   */
  public static class Factory implements UserStateFactory {
    @Override
    public UserState create(Subject subject, AlluxioConfiguration conf, boolean isServer) {
      AuthType authType = conf.getEnum(PropertyKey.SECURITY_AUTHENTICATION_TYPE, AuthType.class);
      if (authType == AuthType.NOSASL) {
        return new NoopUserState(subject, conf);
      }
      return null;
    }
  }

  private NoopUserState(Subject subject, AlluxioConfiguration conf) {
    super(subject, conf);
  }

  @Override
  public User login() throws UnauthenticatedException {
    return NOOP_USER;
  }
}