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;
  
  public interface PasswdAuthenticationProvider {
  
    /**
     * The Authenticate method is called by the HiveServer2 authentication 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}.
     * <p/>
     * For an example implementation, see {@link LdapAuthenticationProviderImpl}.
     *
     * @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;
  }
  