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 org.apache.cassandra.auth.AuthenticatedUser;
  import org.apache.cassandra.auth.IResource;
  import org.apache.cassandra.auth.Resources;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.dht.LocalPartitioner;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.utils.Pair;
  
  final class PermissionsCacheKeysTable extends AbstractMutableVirtualTable
  {
      private static final String ROLE = "role";
      private static final String RESOURCE = "resource";
  
      PermissionsCacheKeysTable(String keyspace)
      {
          super(TableMetadata.builder(keyspace, "permissions_cache_keys")
                  .comment("keys in the permissions cache")
                  .kind(TableMetadata.Kind.VIRTUAL)
                  .partitioner(new LocalPartitioner(UTF8Type.instance))
                  .addPartitionKeyColumn(ROLE, UTF8Type.instance)
                  .addPartitionKeyColumn(RESOURCE, UTF8Type.instance)
                  .build());
      }
  
      public DataSet data()
      {
          SimpleDataSet result = new SimpleDataSet(metadata());
  
          AuthenticatedUser.permissionsCache.getAll()
                  .forEach((userResoursePair, ignored) ->
                          result.row(userResoursePair.left.getName(), userResoursePair.right.getName()));
  
          return result;
      }
  
      @Override
      protected void applyPartitionDeletion(ColumnValues partitionKey)
      {
          AuthenticatedUser user = new AuthenticatedUser(partitionKey.value(0));
          IResource resource = resourceFromNameIfExists(partitionKey.value(1));
          // no need to delete invalid resource
          if (resource == null)
              return;
  
          AuthenticatedUser.permissionsCache.invalidate(Pair.create(user, resource));
      }
  
      @Override
      public void truncate()
      {
          AuthenticatedUser.permissionsCache.invalidate();
      }
  
      private IResource resourceFromNameIfExists(String name)
      {
          try
          {
              return Resources.fromName(name);
          }
          catch (IllegalArgumentException e)
          {
              return null;
          }
      }
  }
  