package org.apache.continuum.webdav;
   
   /*
    * 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.continuum.buildagent.configuration.BuildAgentConfigurationService;
  import org.apache.jackrabbit.webdav.DavException;
  import org.apache.jackrabbit.webdav.DavLocatorFactory;
  import org.apache.jackrabbit.webdav.DavMethods;
  import org.apache.jackrabbit.webdav.DavResource;
  import org.apache.jackrabbit.webdav.DavResourceFactory;
  import org.apache.jackrabbit.webdav.DavServletResponse;
  import org.apache.jackrabbit.webdav.DavSessionProvider;
  import org.apache.jackrabbit.webdav.WebdavRequest;
  import org.apache.jackrabbit.webdav.WebdavRequestImpl;
  import org.apache.jackrabbit.webdav.WebdavResponse;
  import org.apache.jackrabbit.webdav.WebdavResponseImpl;
  import org.apache.jackrabbit.webdav.server.AbstractWebdavServlet;
  import org.codehaus.plexus.spring.PlexusToSpringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.context.ConfigurableApplicationContext;
  import org.springframework.web.context.WebApplicationContext;
  import org.springframework.web.context.support.WebApplicationContextUtils;
  
  import java.io.IOException;
  import javax.servlet.ServletConfig;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  public class WorkingCopyServlet
      extends AbstractWebdavServlet
  {
      private Logger log = LoggerFactory.getLogger( this.getClass() );
  
      private DavLocatorFactory locatorFactory;
  
      private DavResourceFactory resourceFactory;
  
      protected DavSessionProvider sessionProvider;
  
      @Override
      public void init( ServletConfig servletConfig )
          throws ServletException
      {
          super.init( servletConfig );
          initServers( servletConfig );
      }
  
      /**
       * Service the given request. This method has been overridden and copy/pasted to allow better exception handling and
       * to support different realms
       *
       * @param request
       * @param response
       * @throws ServletException
       * @throws java.io.IOException
       */
      @Override
      protected void service( HttpServletRequest request, HttpServletResponse response )
          throws ServletException, IOException
      {
          WebdavRequest webdavRequest = new WebdavRequestImpl( request, getLocatorFactory() );
  
          // DeltaV requires 'Cache-Control' header for all methods except 'VERSION-CONTROL' and 'REPORT'.
          int methodCode = DavMethods.getMethodCode( request.getMethod() );
          boolean noCache = DavMethods.isDeltaVMethod( webdavRequest ) &&
              !( DavMethods.DAV_VERSION_CONTROL == methodCode || DavMethods.DAV_REPORT == methodCode );
          WebdavResponse webdavResponse = new WebdavResponseImpl( response, noCache );
          DavResource resource = null;
  
          try
          {
              // make sure there is a authenticated user
              if ( !( getDavSessionProvider() ).attachSession( webdavRequest ) )
              {
                  return;
              }
  
              // check matching if=header for lock-token relevant operations
              resource = getResourceFactory().createResource( webdavRequest.getRequestLocator(), webdavRequest,
                                                              webdavResponse );
 
             if ( !isPreconditionValid( webdavRequest, resource ) )
             {
                 webdavResponse.sendError( DavServletResponse.SC_PRECONDITION_FAILED );
                 return;
             }
             if ( !execute( webdavRequest, webdavResponse, methodCode, resource ) )
             {
                 super.service( request, response );
             }
         }
         catch ( DavException e )
         {
             if ( e.getErrorCode() == HttpServletResponse.SC_UNAUTHORIZED )
             {
                 final String msg = "Unauthorized error";
                 log.error( msg );
                 webdavResponse.sendError( e.getErrorCode(), msg );
             }
             else if ( e.getCause() != null )
             {
                 webdavResponse.sendError( e.getErrorCode(), e.getCause().getMessage() );
             }
             else
             {
                 webdavResponse.sendError( e.getErrorCode(), e.getMessage() );
             }
         }
         finally
         {
             getDavSessionProvider().releaseSession( webdavRequest );
         }
     }
 
     public synchronized void initServers( ServletConfig servletConfig )
     {
         WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(
             servletConfig.getServletContext() );
 
         resourceFactory = (DavResourceFactory) wac.getBean( PlexusToSpringUtils.
             buildSpringId( ContinuumBuildAgentDavResourceFactory.class ) );
 
         BuildAgentConfigurationService buildAgentConfigurationService = (BuildAgentConfigurationService) wac.getBean(
             PlexusToSpringUtils.buildSpringId( BuildAgentConfigurationService.class ) );
 
         locatorFactory = new ContinuumBuildAgentDavLocatorFactory();
         sessionProvider = new ContinuumBuildAgentDavSessionProvider( buildAgentConfigurationService );
     }
 
     @Override
     public String getAuthenticateHeaderValue()
     {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public DavSessionProvider getDavSessionProvider()
     {
         return sessionProvider;
     }
 
     @Override
     public DavLocatorFactory getLocatorFactory()
     {
         return locatorFactory;
     }
 
     @Override
     public DavResourceFactory getResourceFactory()
     {
         return resourceFactory;
     }
 
     @Override
     protected boolean isPreconditionValid( WebdavRequest request, DavResource resource )
     {
         // TODO Auto-generated method stub
         return true;
     }
 
     @Override
     public void setDavSessionProvider( final DavSessionProvider sessionProvider )
     {
         this.sessionProvider = sessionProvider;
     }
 
     @Override
     public void setLocatorFactory( final DavLocatorFactory locatorFactory )
     {
         this.locatorFactory = locatorFactory;
     }
 
     @Override
     public void setResourceFactory( DavResourceFactory resourceFactory )
     {
         this.resourceFactory = resourceFactory;
     }
 
     @Override
     public void destroy()
     {
         resourceFactory = null;
         locatorFactory = null;
         sessionProvider = null;
 
         WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext( getServletContext() );
 
         if ( wac instanceof ConfigurableApplicationContext )
         {
             ( (ConfigurableApplicationContext) wac ).close();
         }
         super.destroy();
     }
 }