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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.authentication;

import alluxio.conf.AlluxioConfiguration;
import alluxio.conf.PropertyKey;
import alluxio.security.authentication.plain.CustomAuthenticationProvider;
import alluxio.security.authentication.plain.PlainSaslServer;
import alluxio.security.authentication.plain.PlainSaslServerCallbackHandler;
import alluxio.security.authentication.plain.SimpleAuthenticationProvider;

import javax.security.sasl.AuthenticationException;

/**
 * Abstraction for an authentication provider at SASL server for
 * {@link AuthType#SIMPLE} and {@link AuthType#CUSTOM}.
 */
public interface AuthenticationProvider {

  /**
   * Factory for {@link AuthenticationProvider}.
   */
  class Factory {

    // prevent instantiation
    private Factory() {}

    /**
     * @param authType authentication type to use
     * @return the generated {@link AuthenticationProvider}
     * @throws AuthenticationException when unsupported authentication type is used
     */
    public static AuthenticationProvider create(AuthType authType, AlluxioConfiguration conf)
        throws AuthenticationException {
      switch (authType) {
        case SIMPLE:
          return new SimpleAuthenticationProvider();
        case CUSTOM:
          Class customProviderName =
              conf.getClass(PropertyKey.SECURITY_AUTHENTICATION_CUSTOM_PROVIDER_CLASS);
          return new CustomAuthenticationProvider(customProviderName);
        default:
          throw new AuthenticationException("Unsupported AuthType: " + authType);
      }
    }
  }

  /**
   * The authenticate method is called by the {@link PlainSaslServerCallbackHandler} in
   * the {@link PlainSaslServer} layer to authenticate users for their requests. If a user is to be
   * granted, return nothing/throw nothing. When a user is to be disallowed, throw an appropriate
   * {@link AuthenticationException}.
   *
   * @param user The username received over the connection request
   * @param password The password received over the connection request
   *
   * @throws AuthenticationException when a user is found to be invalid by the implementation
   */
  void authenticate(String user, String password) throws AuthenticationException;
}