package org.apache.maven.search.backend.smo.internal;
   
   /*
    * 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.
   */
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.HttpURLConnection;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;
  import java.util.Scanner;
  
  import org.apache.maven.search.SearchRequest;
  
  /**
   * {@link java.net.HttpURLConnection} backed transport.
   */
  public class UrlConnectionSmoSearchTransport extends SmoSearchTransportSupport
  {
      @Override
      public String fetch( SearchRequest searchRequest, String serviceUri ) throws IOException
      {
          HttpURLConnection httpConnection = (HttpURLConnection) new URL( serviceUri ).openConnection();
          httpConnection.setInstanceFollowRedirects( false );
          httpConnection.setRequestProperty( "User-Agent", getUserAgent() );
          httpConnection.setRequestProperty( "Accept", "application/json" );
          int httpCode = httpConnection.getResponseCode();
          if ( httpCode == HttpURLConnection.HTTP_OK )
          {
              try ( InputStream inputStream = httpConnection.getInputStream() )
              {
                  try ( Scanner scanner = new Scanner( inputStream, StandardCharsets.UTF_8.name() ) )
                  {
                      return scanner.useDelimiter( "\\A" ).next();
                  }
              }
          }
          else
          {
              throw new IOException( "Unexpected response code: " + httpCode );
          }
      }
  }