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.config;
  
  import java.util.List;
  import java.util.Locale;
  
  /**
   * Describes whether the server should require or request client authentication.
   */
  public enum SslClientAuth {
      REQUIRED,
      REQUESTED,
      NONE;
  
      public static final List<SslClientAuth> VALUES = List.of(SslClientAuth.values());
  
      public static SslClientAuth forConfig(String key) {
          if (key == null) {
              return SslClientAuth.NONE;
          }
          String upperCaseKey = key.toUpperCase(Locale.ROOT);
          for (SslClientAuth auth : VALUES) {
              if (auth.name().equals(upperCaseKey)) {
                  return auth;
              }
          }
          return null;
      }
  
      @Override
      public String toString() {
          return super.toString().toLowerCase(Locale.ROOT);
      }
  }
  