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.celeborn.spi.authentication;
  
  import java.security.Principal;
  
  import javax.security.sasl.AuthenticationException;
  
  public interface PasswdAuthenticationProvider {
    /**
     * The authenticate method is called by the celeborn authentication layer to authenticate password
     * credential for their requests. If a credential is to be granted, return nothing/throw nothing.
     * When a credential is to be disallowed, throw an appropriate [[SecurityException]].
     *
     * @param credential The credential received over the connection request
     * @return The identifier associated with the credential
     * @throws AuthenticationException When a user is found to be invalid by the implementation
     */
    Principal authenticate(PasswordCredential credential) throws AuthenticationException;
  }
  