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.arrow.adbc.driver.flightsql;
  
  import java.util.ArrayList;
  import org.apache.arrow.flight.CallHeaders;
  import org.apache.arrow.flight.CallInfo;
  import org.apache.arrow.flight.CallStatus;
  import org.apache.arrow.flight.FlightCallHeaders;
  import org.apache.arrow.flight.FlightServerMiddleware;
  import org.apache.arrow.flight.RequestContext;
  
  public class HeaderValidator implements FlightServerMiddleware {
    public static final Key<HeaderValidator> KEY = Key.of("HeaderValidator");
  
    @Override
    public void onBeforeSendingHeaders(CallHeaders callHeaders) {}
  
    @Override
    public void onCallCompleted(CallStatus callStatus) {}
  
    @Override
    public void onCallErrored(Throwable throwable) {}
  
    public static class Factory implements FlightServerMiddleware.Factory<HeaderValidator> {
  
      private final ArrayList<CallHeaders> headersReceived = new ArrayList<>();
  
      @Override
      public HeaderValidator onCallStarted(
          CallInfo callInfo, CallHeaders callHeaders, RequestContext requestContext) {
        CallHeaders cloneHeaders = cloneHeaders(callHeaders);
        headersReceived.add(cloneHeaders);
        return new HeaderValidator();
      }
  
      public CallHeaders getHeadersReceivedAtRequest(int request) {
        return cloneHeaders(headersReceived.get(request));
      }
  
      private static CallHeaders cloneHeaders(CallHeaders headers) {
        FlightCallHeaders cloneHeaders = new FlightCallHeaders();
        for (String key : headers.keys()) {
          for (String value : headers.getAll(key)) {
            cloneHeaders.insert(key, value);
          }
        }
        return cloneHeaders;
      }
    }
  }
  