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.sidecar.handlers.cassandra;
  
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  import io.vertx.core.http.HttpServerRequest;
  import io.vertx.core.net.SocketAddress;
  import io.vertx.ext.web.RoutingContext;
  import org.apache.cassandra.sidecar.concurrent.ExecutorPools;
  import org.apache.cassandra.sidecar.handlers.AbstractHandler;
  import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher;
  import org.jetbrains.annotations.NotNull;
  
  /**
   * Provides REST endpoint to get the configured settings of a cassandra node.
   * <p>
   * Note: {@link NodeSettingsHandler} is not Access protected. Any user who can log in into Cassandra is able to view
   * node settings information. Since sidecar and cassandra share list of authenticated identities, sidecar's
   * authenticated users can also read node settings information.
   */
  @Singleton
  public class NodeSettingsHandler extends AbstractHandler<Void>
  {
      /**
       * Constructs a handler with the provided {@code metadataFetcher}
       *
       * @param metadataFetcher the interface to retrieve instance metadata
       */
      @Inject
      NodeSettingsHandler(InstanceMetadataFetcher metadataFetcher, ExecutorPools executorPools)
      {
          super(metadataFetcher, executorPools, null);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void handleInternal(RoutingContext context,
                                 HttpServerRequest httpRequest,
                                 @NotNull String host,
                                 SocketAddress remoteAddress,
                                 Void request)
      {
          context.json(metadataFetcher.delegate(host).nodeSettings());
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected Void extractParamsOrThrow(RoutingContext context)
      {
          return null;
      }
  }
  