content: /**
   * 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.hive.service.auth;
  
  import javax.security.sasl.AuthenticationException;
  
  import org.apache.hadoop.hive.conf.HiveConf;
  import org.apache.hadoop.util.ReflectionUtils;
  
  /**
   * This authentication provider implements the {@code CUSTOM} authentication. It allows a {@link
   * PasswdAuthenticationProvider} to be specified at configuration time which may additionally
   * implement {@link org.apache.hadoop.conf.Configurable Configurable} to grab Hive's {@link
   * org.apache.hadoop.conf.Configuration Configuration}.
   */
  public class CustomAuthenticationProviderImpl implements PasswdAuthenticationProvider {
  
    private final PasswdAuthenticationProvider customProvider;
  
    @SuppressWarnings("unchecked")
    CustomAuthenticationProviderImpl() {
      HiveConf conf = new HiveConf();
      Class<? extends PasswdAuthenticationProvider> customHandlerClass =
        (Class<? extends PasswdAuthenticationProvider>) conf.getClass(
          HiveConf.ConfVars.HIVE_SERVER2_CUSTOM_AUTHENTICATION_CLASS.varname,
          PasswdAuthenticationProvider.class);
      customProvider = ReflectionUtils.newInstance(customHandlerClass, conf);
    }
  
    @Override
    public void Authenticate(String user, String password) throws AuthenticationException {
      customProvider.Authenticate(user, password);
    }
  
  }
  