package org.apache.maven.wagon.providers.http;
   
   /*
    * 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 org.apache.http.HttpEntity;
  import org.apache.http.HttpException;
  import org.apache.http.HttpStatus;
  import org.apache.http.client.methods.CloseableHttpResponse;
  import org.apache.http.client.methods.HttpGet;
  import org.apache.maven.wagon.ResourceDoesNotExistException;
  import org.apache.maven.wagon.TransferFailedException;
  import org.apache.maven.wagon.authorization.AuthorizationException;
  import org.apache.maven.wagon.shared.http.AbstractHttpClientWagon;
  import org.apache.maven.wagon.shared.http.HtmlFileListParser;
  import org.apache.maven.wagon.shared.http.HttpMessageUtils;
  
  import java.io.IOException;
  import java.util.Collections;
  import java.util.List;
  
  import static org.apache.maven.wagon.shared.http.HttpMessageUtils.formatResourceDoesNotExistMessage;
  import static org.apache.maven.wagon.shared.http.HttpMessageUtils.formatTransferDebugMessage;
  import static org.apache.maven.wagon.shared.http.HttpMessageUtils.formatTransferFailedMessage;
  
  /**
   * @author <a href="michal.maczka@dimatics.com">Michal Maczka</a>
   */
  public class HttpWagon
      extends AbstractHttpClientWagon
  {
  
      public List<String> getFileList( String destinationDirectory )
          throws AuthorizationException, ResourceDoesNotExistException, TransferFailedException
      {
          return getFileList( getInitialBackoffSeconds(), destinationDirectory );
      }
  
      private List<String> getFileList( int wait, String destinationDirectory )
          throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException
      {
          if ( destinationDirectory.length() > 0 && !destinationDirectory.endsWith( "/" ) )
          {
              destinationDirectory += "/";
          }
  
          String url = getRepository().getUrl() + "/" + destinationDirectory;
  
          HttpGet getMethod = new HttpGet( url );
  
          try
          {
              CloseableHttpResponse response = execute( getMethod );
              try
              {
                  String reasonPhrase = response.getStatusLine().getReasonPhrase();
                  int statusCode = response.getStatusLine().getStatusCode();
  
                  fireTransferDebug( formatTransferDebugMessage( url, statusCode, reasonPhrase, getProxyInfo() ) );
  
                  switch ( statusCode )
                  {
                      case HttpStatus.SC_OK:
                          break;
  
                      case HttpStatus.SC_FORBIDDEN:
                      case HttpStatus.SC_UNAUTHORIZED:
                      case HttpStatus.SC_PROXY_AUTHENTICATION_REQUIRED:
                          throw new AuthorizationException( HttpMessageUtils.formatAuthorizationMessage( url, statusCode,
                                  reasonPhrase, getProxyInfo() ) );
  
                      case HttpStatus.SC_NOT_FOUND:
                          throw new ResourceDoesNotExistException( formatResourceDoesNotExistMessage( url, statusCode,
                                  reasonPhrase, getProxyInfo() ) );
  
                      case SC_TOO_MANY_REQUESTS:
                          return getFileList( backoff( wait, url ), destinationDirectory );
  
                      //add more entries here
                      default:
                          throw new TransferFailedException( formatTransferFailedMessage( url, statusCode, reasonPhrase,
                                  getProxyInfo() ) );
                  }
                 HttpEntity entity = response.getEntity();
                 if ( entity != null )
                 {
                     return HtmlFileListParser.parseFileList( url, entity.getContent() );
                 }
                 else
                 {
                     return Collections.emptyList();
                 }
 
             }
             finally
             {
                 response.close();
             }
         }
         catch ( IOException e )
         {
             throw new TransferFailedException( "Could not read response body.", e );
         }
         catch ( HttpException e )
         {
             throw new TransferFailedException( "Could not read response body.", e );
         }
         catch ( InterruptedException e )
         {
             throw new TransferFailedException( "Unable to wait for resource.", e );
         }
     }
 
 }