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.kafka.common.security.auth;
  
  /**
   * Pluggable principal builder interface which supports both SSL authentication through
   * {@link SslAuthenticationContext} and SASL through {@link SaslAuthenticationContext}.
   *
   * Note that the {@link org.apache.kafka.common.Configurable} and {@link java.io.Closeable}
   * interfaces are respected if implemented. Additionally, implementations must provide a
   * default no-arg constructor.
   *
   * Note that custom implementations of {@link KafkaPrincipalBuilder}
   * must also implement {@link KafkaPrincipalSerde}, otherwise brokers will not be able to
   * forward requests to the controller.
   */
  public interface KafkaPrincipalBuilder {
      /**
       * Build a kafka principal from the authentication context.
       * @param context The authentication context (either {@link SslAuthenticationContext} or
       *        {@link SaslAuthenticationContext})
       * @return The built principal which may provide additional enrichment through a subclass of
       *        {@link KafkaPrincipalBuilder}.
       */
      KafkaPrincipal build(AuthenticationContext context);
  }
  