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.scram;
  
  import org.apache.kafka.common.security.scram.internals.ScramSaslClientProvider;
  import org.apache.kafka.common.security.scram.internals.ScramSaslServerProvider;
  
  import java.util.Collections;
  import java.util.Map;
  
  import javax.security.auth.Subject;
  import javax.security.auth.callback.CallbackHandler;
  import javax.security.auth.spi.LoginModule;
  
  public class ScramLoginModule implements LoginModule {
  
      private static final String USERNAME_CONFIG = "username";
      private static final String PASSWORD_CONFIG = "password";
      public static final String TOKEN_AUTH_CONFIG = "tokenauth";
  
      static {
          ScramSaslClientProvider.initialize();
          ScramSaslServerProvider.initialize();
      }
  
      @Override
      public void initialize(Subject subject, CallbackHandler callbackHandler, Map<String, ?> sharedState, Map<String, ?> options) {
          String username = (String) options.get(USERNAME_CONFIG);
          if (username != null)
              subject.getPublicCredentials().add(username);
          String password = (String) options.get(PASSWORD_CONFIG);
          if (password != null)
              subject.getPrivateCredentials().add(password);
  
          boolean useTokenAuthentication = "true".equalsIgnoreCase((String) options.get(TOKEN_AUTH_CONFIG));
          if (useTokenAuthentication) {
              Map<String, String> scramExtensions = Collections.singletonMap(TOKEN_AUTH_CONFIG, "true");
              subject.getPublicCredentials().add(scramExtensions);
          }
      }
  
      @Override
      public boolean login() {
          return true;
      }
  
      @Override
      public boolean logout() {
          return true;
      }
  
      @Override
      public boolean commit() {
          return true;
      }
  
      @Override
      public boolean abort() {
          return false;
      }
  }
  