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.cql3.statements;
  
  import org.apache.cassandra.audit.AuditLogContext;
  import org.apache.cassandra.audit.AuditLogEntryType;
  import org.apache.cassandra.auth.Permission;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.exceptions.InvalidRequestException;
  import org.apache.cassandra.exceptions.RequestExecutionException;
  import org.apache.cassandra.exceptions.RequestValidationException;
  import org.apache.cassandra.service.ClientState;
  import org.apache.cassandra.transport.messages.ResultMessage;
  
  /**
   * Cqlsh statement to remove identity from identity_to_roles table.
   * Ex: DROP IDENTITY 'testIdentity'
   */
  public class DropIdentityStatement extends AuthenticationStatement
  {
      final String identity;
      final boolean ifExists;
  
      public DropIdentityStatement(String identity, boolean ifExists)
      {
          this.identity = identity;
          this.ifExists = ifExists;
      }
  
      @Override
      public void authorize(ClientState state)
      {
          checkPermission(state, Permission.DROP, state.getUser().getPrimaryRole());
      }
  
      @Override
      public void validate(ClientState state)
      {
          state.ensureNotAnonymous();
  
          if (!ifExists && !DatabaseDescriptor.getRoleManager().isExistingIdentity(identity))
          {
              throw new InvalidRequestException(String.format("identity '%s' doesn't exist", identity));
          }
      }
  
      @Override
      public AuditLogContext getAuditLogContext()
      {
          return new AuditLogContext(AuditLogEntryType.DROP_IDENTITY);
      }
  
      @Override
      public ResultMessage execute(ClientState state) throws RequestExecutionException, RequestValidationException
      {
          // not rejected in validate()
          if(!ifExists || DatabaseDescriptor.getRoleManager().isExistingIdentity(identity))
          {
              DatabaseDescriptor.getRoleManager().dropIdentity(identity);
          }
          return null;
      }
  }
  