/*
    * This file is part of dependency-check-utils.
    *
    * Licensed 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.
   *
   * Copyright (c) 2024 Hans Aikema. All Rights Reserved.
   */
  package org.owasp.dependencycheck.utils;
  
  import org.apache.hc.client5.http.impl.classic.AbstractHttpClientResponseHandler;
  import org.apache.hc.core5.http.HttpEntity;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.ByteBuffer;
  import java.nio.channels.Channels;
  import java.nio.channels.FileChannel;
  import java.nio.channels.ReadableByteChannel;
  
  class SaveToFileResponseHandler extends AbstractHttpClientResponseHandler<Void> {
  
      /**
       * The output path where the response content should be stored as a file
       */
      private final File outputPath;
  
      SaveToFileResponseHandler(File outputPath) {
          this.outputPath = outputPath;
      }
  
      @Override
      public Void handleEntity(HttpEntity responseEntity) throws IOException {
          try (InputStream in = responseEntity.getContent();
               ReadableByteChannel sourceChannel = Channels.newChannel(in);
               FileOutputStream fos = new FileOutputStream(outputPath);
               FileChannel destChannel = fos.getChannel()) {
              final ByteBuffer buffer = ByteBuffer.allocateDirect(8192);
              while (sourceChannel.read(buffer) != -1) {
                  buffer.flip();
                  destChannel.write(buffer);
                  buffer.compact();
              }
          }
          return null;
      }
  
  }