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 java.io.IOException;
  import java.io.InputStream;
  import java.util.List;
  
  import org.apache.commons.httpclient.HttpStatus;
  import org.apache.commons.httpclient.methods.GetMethod;
  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;
  
  /**
   * @author <a href="michal.maczka@dimatics.com">Michal Maczka</a>
   * @version $Id: HttpWagon.java 745730 2009-02-19 05:15:51Z brett $
   */
  public class HttpWagon
      extends AbstractHttpClientWagon
  { 
      public List getFileList( String destinationDirectory )
          throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException 
      {
          if ( destinationDirectory.length() > 0 && !destinationDirectory.endsWith( "/" ) )
          {
              destinationDirectory += "/";
          }
  
          String url = getRepository().getUrl() + "/" + destinationDirectory;
  
          GetMethod getMethod = new GetMethod( url );
  
          try
          {
              int statusCode = execute( getMethod );
  
              fireTransferDebug( url + " - Status code: " + statusCode );
  
              // TODO [BP]: according to httpclient docs, really should swallow the output on error. verify if that is required
              switch ( statusCode )
              {
                  case HttpStatus.SC_OK:
                      break;
  
                  case SC_NULL:
                      throw new TransferFailedException( "Failed to transfer file: " );
  
                  case HttpStatus.SC_FORBIDDEN:
                      throw new AuthorizationException( "Access denied to: " + url );
  
                  case HttpStatus.SC_UNAUTHORIZED:
                      throw new AuthorizationException( "Not authorized." );
  
                  case HttpStatus.SC_PROXY_AUTHENTICATION_REQUIRED:
                      throw new AuthorizationException( "Not authorized by proxy." );
  
                  case HttpStatus.SC_NOT_FOUND:
                      throw new ResourceDoesNotExistException( "File: " + url + " does not exist" );
  
                      //add more entries here
                  default :
                      throw new TransferFailedException(
                          "Failed to transfer file: " + url + ". Return code is: " + statusCode );
              }
  
              InputStream is = null;
              
              is = getMethod.getResponseBodyAsStream();
  
              return HtmlFileListParser.parseFileList( url, is );
          }
          catch ( IOException e )
          {
              throw new TransferFailedException( "Could not read response body.", e );
          }
          finally
          {
              getMethod.releaseConnection();
          }
     }
 }