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   * 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.
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  package org.apache.cassandra.cql3.statements;
  
  import org.apache.cassandra.audit.AuditLogContext;
  import org.apache.cassandra.audit.AuditLogEntryType;
  import org.apache.cassandra.auth.*;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.RoleName;
  import org.apache.cassandra.exceptions.*;
  import org.apache.cassandra.service.ClientState;
  import org.apache.cassandra.transport.messages.ResultMessage;
  import org.apache.commons.lang3.builder.ToStringBuilder;
  import org.apache.commons.lang3.builder.ToStringStyle;
  
  public class DropRoleStatement extends AuthenticationStatement
  {
      private final RoleResource role;
      private final boolean ifExists;
  
      public DropRoleStatement(RoleName name, boolean ifExists)
      {
          this.role = RoleResource.role(name.getName());
          this.ifExists = ifExists;
      }
  
      public void authorize(ClientState state) throws UnauthorizedException
      {
          super.checkPermission(state, Permission.DROP, role);
  
          // We only check superuser status for existing roles to avoid
          // caching info about roles which don't exist (CASSANDRA-9189)
          if (DatabaseDescriptor.getRoleManager().isExistingRole(role)
              && Roles.hasSuperuserStatus(role)
              && !state.getUser().isSuper())
              throw new UnauthorizedException("Only superusers can drop a role with superuser status");
      }
  
      public void validate(ClientState state) throws RequestValidationException
      {
          // validate login here before authorize to avoid leaking user existence to anonymous users.
          state.ensureNotAnonymous();
  
          if (!ifExists && !DatabaseDescriptor.getRoleManager().isExistingRole(role))
              throw new InvalidRequestException(String.format("%s doesn't exist", role.getRoleName()));
  
          AuthenticatedUser user = state.getUser();
          if (user != null && user.getName().equals(role.getRoleName()))
              throw new InvalidRequestException("Cannot DROP primary role for current login");
      }
  
      public ResultMessage execute(ClientState state) throws RequestValidationException, RequestExecutionException
      {
          // not rejected in validate()
          if (ifExists && !DatabaseDescriptor.getRoleManager().isExistingRole(role))
              return null;
  
          // clean up grants and permissions of/on the dropped role.
          DatabaseDescriptor.getRoleManager().dropRole(state.getUser(), role);
          DatabaseDescriptor.getAuthorizer().revokeAllFrom(role);
          DatabaseDescriptor.getAuthorizer().revokeAllOn(role);
          DatabaseDescriptor.getNetworkAuthorizer().drop(role);
          DatabaseDescriptor.getCIDRAuthorizer().dropCidrPermissionsForRole(role);
          return null;
      }
      
      @Override
      public String toString()
      {
          return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
      }
  
      @Override
      public AuditLogContext getAuditLogContext()
      {
          return new AuditLogContext(AuditLogEntryType.DROP_ROLE);
      }
  }
  