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.cassandra.db.virtual;
  
  import java.util.Optional;
  
  import org.apache.cassandra.auth.IAuthenticator;
  import org.apache.cassandra.auth.PasswordAuthenticator;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.dht.LocalPartitioner;
  import org.apache.cassandra.schema.TableMetadata;
  
  final class CredentialsCacheKeysTable extends AbstractMutableVirtualTable
  {
      private static final String ROLE = "role";
  
      @SuppressWarnings("OptionalUsedAsFieldOrParameterType")
      private final Optional<PasswordAuthenticator> passwordAuthenticatorOptional;
  
      CredentialsCacheKeysTable(String keyspace)
      {
          super(TableMetadata.builder(keyspace, "credentials_cache_keys")
                  .comment("keys in the credentials cache")
                  .kind(TableMetadata.Kind.VIRTUAL)
                  .partitioner(new LocalPartitioner(UTF8Type.instance))
                  .addPartitionKeyColumn(ROLE, UTF8Type.instance)
                  .build());
  
          IAuthenticator authenticator = DatabaseDescriptor.getAuthenticator();
          if (authenticator instanceof PasswordAuthenticator)
              this.passwordAuthenticatorOptional = Optional.of((PasswordAuthenticator) authenticator);
          else
              this.passwordAuthenticatorOptional = Optional.empty();
      }
  
      public DataSet data()
      {
          SimpleDataSet result = new SimpleDataSet(metadata());
  
          passwordAuthenticatorOptional
                  .ifPresent(passwordAuthenticator -> passwordAuthenticator.getCredentialsCache().getAll()
                          .forEach((roleName, ignored) -> result.row(roleName)));
  
          return result;
      }
  
      @Override
      protected void applyPartitionDeletion(ColumnValues partitionKey)
      {
          String roleName = partitionKey.value(0);
  
          passwordAuthenticatorOptional
                  .ifPresent(passwordAuthenticator -> passwordAuthenticator.getCredentialsCache().invalidate(roleName));
      }
  
      @Override
      public void truncate()
      {
          passwordAuthenticatorOptional
                  .ifPresent(passwordAuthenticator -> passwordAuthenticator.getCredentialsCache().invalidate());
      }
  }
  