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 java.util.Set;
  
  import org.apache.cassandra.auth.*;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.RoleName;
  import org.apache.cassandra.exceptions.InvalidRequestException;
  import org.apache.cassandra.exceptions.RequestValidationException;
  import org.apache.cassandra.exceptions.UnauthorizedException;
  import org.apache.cassandra.service.ClientState;
  import org.apache.commons.lang3.builder.ToStringBuilder;
  import org.apache.commons.lang3.builder.ToStringStyle;
  
  public abstract class PermissionsManagementStatement extends AuthorizationStatement
  {
      protected final Set<Permission> permissions;
      protected IResource resource;
      protected final RoleResource grantee;
  
      protected PermissionsManagementStatement(Set<Permission> permissions, IResource resource, RoleName grantee)
      {
          this.permissions = permissions;
          this.resource = resource;
          this.grantee = RoleResource.role(grantee.getName());
      }
  
      public void validate(ClientState state) throws RequestValidationException
      {
          // validate login here before authorize to avoid leaking user existence to anonymous users.
          state.ensureNotAnonymous();
  
          if (!DatabaseDescriptor.getRoleManager().isExistingRole(grantee))
              throw new InvalidRequestException(String.format("Role %s doesn't exist", grantee.getRoleName()));
  
          // if a keyspace is omitted when GRANT/REVOKE ON TABLE <table>, we need to correct the resource.
          // called both here and in authorize(), as in some cases we do not call the latter.
          resource = maybeCorrectResource(resource, state);
  
          if (!resource.exists())
              throw new InvalidRequestException(String.format("Resource %s doesn't exist", resource));
      }
  
      public void authorize(ClientState state) throws UnauthorizedException
      {
          // if a keyspace is omitted when GRANT/REVOKE ON TABLE <table>, we need to correct the resource.
          resource = maybeCorrectResource(resource, state);
  
          // check that the user has AUTHORIZE permission on the resource or its parents, otherwise reject GRANT/REVOKE.
          state.ensurePermission(Permission.AUTHORIZE, resource);
  
          // check that the user has [a single permission or all in case of ALL] on the resource or its parents.
          for (Permission p : permissions)
              state.ensurePermission(p, resource);
      }
  
      @Override
      public String toString()
      {
          return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
      }
  }
  