package org.apache.archiva.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.archiva.admin.model.RepositoryAdminException;
  import org.apache.archiva.configuration.ArchivaConfiguration;
  import org.apache.archiva.configuration.ConfigurationEvent;
  import org.apache.archiva.configuration.ConfigurationListener;
  import org.apache.archiva.redback.integration.filter.authentication.HttpAuthenticator;
  import org.apache.archiva.repository.base.ArchivaRepositoryRegistry;
  import org.apache.archiva.repository.ManagedRepository;
  import org.apache.archiva.repository.RepositoryRegistry;
  import org.apache.archiva.security.ServletAuthenticator;
  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.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 javax.servlet.ServletConfig;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.io.IOException;
  import java.util.concurrent.locks.ReentrantReadWriteLock;
  
  /**
   * RepositoryServlet
   */
  public class RepositoryServlet
      extends AbstractWebdavServlet
      implements ConfigurationListener
  {
      private Logger log = LoggerFactory.getLogger( RepositoryServlet.class );
  
      private ArchivaConfiguration configuration;
  
      RepositoryRegistry repositoryRegistry;
  
      private DavLocatorFactory locatorFactory;
  
      private DavResourceFactory resourceFactory;
  
      private DavSessionProvider sessionProvider;
  
      protected final ReentrantReadWriteLock rwLock = new ReentrantReadWriteLock();
  
      @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 ( UnauthorizedDavException e )
         {
             webdavResponse.setHeader( "WWW-Authenticate", getAuthenticateHeaderValue( e.getRepositoryName() ) );
             webdavResponse.sendError( e.getErrorCode(), e.getStatusPhrase() );
         }
         catch ( BrowserRedirectException e )
         {
             response.sendRedirect( e.getLocation() );
         }
         catch ( DavException e )
         {
             if ( e.getErrorCode() == HttpServletResponse.SC_UNAUTHORIZED )
             {
                 final String msg = "Should throw " + UnauthorizedDavException.class.getName();
                 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 void initServers( ServletConfig servletConfig ) {
 
         long start = System.currentTimeMillis();
 
         WebApplicationContext wac =
             WebApplicationContextUtils.getRequiredWebApplicationContext( servletConfig.getServletContext() );
 
         rwLock.writeLock().lock();
         try {
             configuration = wac.getBean("archivaConfiguration#default", ArchivaConfiguration.class);
             configuration.addListener(this);
 
             repositoryRegistry = wac.getBean( ArchivaRepositoryRegistry.class);
             resourceFactory = wac.getBean("davResourceFactory#archiva", DavResourceFactory.class);
             locatorFactory = new ArchivaDavLocatorFactory();
 
             ServletAuthenticator servletAuth = wac.getBean(ServletAuthenticator.class);
             HttpAuthenticator httpAuth = wac.getBean("httpAuthenticator#basic", HttpAuthenticator.class);
 
             sessionProvider = new ArchivaDavSessionProvider(servletAuth, httpAuth);
         } finally {
             rwLock.writeLock().unlock();
         }
         long end = System.currentTimeMillis();
 
         log.debug( "initServers done in {} ms", (end - start) );
     }
 
     @Override
     public void configurationEvent( ConfigurationEvent event )
     {
         if ( event.getType() == ConfigurationEvent.SAVED )
         {
             try
             {
                 initRepositories();
             }
             catch ( RepositoryAdminException e )
             {
                 log.error( e.getMessage(), e );
                 throw new RuntimeException( e.getMessage(), e );
             }
         }
     }
 
     private void initRepositories()
         throws RepositoryAdminException
     {
             initServers( getServletConfig() );
     }
 
     public ManagedRepository getRepository( String prefix )
         throws RepositoryAdminException
     {
         return repositoryRegistry.getManagedRepository( prefix );
     }
 
     ArchivaConfiguration getConfiguration()
     {
         return configuration;
     }
 
     @Override
     protected boolean isPreconditionValid( final WebdavRequest request, final DavResource davResource )
     {
         // check for read or write access to the resource when resource-based permission is implemented
 
         return true;
     }
 
     @Override
     public DavSessionProvider getDavSessionProvider()
     {
         return sessionProvider;
     }
 
     @Override
     public void setDavSessionProvider( final DavSessionProvider davSessionProvider )
     {
         this.sessionProvider = davSessionProvider;
     }
 
     @Override
     public DavLocatorFactory getLocatorFactory()
     {
         return locatorFactory;
     }
 
     @Override
     public void setLocatorFactory( final DavLocatorFactory davLocatorFactory )
     {
         locatorFactory = davLocatorFactory;
     }
 
     @Override
     public DavResourceFactory getResourceFactory()
     {
         return resourceFactory;
     }
 
     @Override
     public void setResourceFactory( final DavResourceFactory davResourceFactory )
     {
         resourceFactory = davResourceFactory;
     }
 
     @Override
     public String getAuthenticateHeaderValue()
     {
         throw new UnsupportedOperationException();
     }
 
     public String getAuthenticateHeaderValue( String repository )
     {
         return "Basic realm=\"Repository Archiva Managed " + repository + " Repository\"";
     }
 
     @Override
     public void destroy()
     {
         rwLock.writeLock().lock();
         try {
             configuration.removeListener(this);
 
             resourceFactory = null;
             configuration = null;
             locatorFactory = null;
             sessionProvider = null;
 
             WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
 
             if (wac instanceof ConfigurableApplicationContext) {
                 ((ConfigurableApplicationContext) wac).close();
             }
             super.destroy();
         } finally {
             rwLock.writeLock().unlock();
         }
     }
 }