// ========================================================================
   // Copyright (c) 2009-2009 Mort Bay Consulting Pty. Ltd.
   // ------------------------------------------------------------------------
   // All rights reserved. This program and the accompanying materials
   // are made available under the terms of the Eclipse Public License v1.0
   // and Apache License v2.0 which accompanies this distribution.
   // The Eclipse Public License is available at 
   // http://www.eclipse.org/legal/epl-v10.html
   // The Apache License v2.0 is available at
  // http://www.opensource.org/licenses/apache2.0.php
  // You may elect to redistribute this code under either of these licenses. 
  // ========================================================================
  
  
  package org.eclipse.jetty.security.authentication;
  
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Locale;
  
  import javax.servlet.ServletOutputStream;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import javax.servlet.http.Cookie;
  import javax.servlet.http.HttpServletResponse;
  
  import org.eclipse.jetty.security.Authenticator;
  import org.eclipse.jetty.security.IdentityService;
  import org.eclipse.jetty.security.ServerAuthException;
  import org.eclipse.jetty.server.Authentication;
  import org.eclipse.jetty.util.IO;
  import org.eclipse.jetty.util.log.Log;
  
  public class DeferredAuthentication implements Authentication.Deferred
  {
      protected final Authenticator _authenticator;
  
      private IdentityService _identityService;
      private Object _previousAssociation;
  
      public DeferredAuthentication(Authenticator authenticator)
      {
          if (authenticator == null)
              throw new NullPointerException("No Authenticator");
          this._authenticator = authenticator;
      }
      
      /* ------------------------------------------------------------ */
      /** Get the identityService.
       * @return the identityService
       */
      public IdentityService getIdentityService()
      {
          return _identityService;
      }
  
      /* ------------------------------------------------------------ */
      /** Set the identityService.
       * @param identityService the identityService to set
       */
      public void setIdentityService(IdentityService identityService)
      {
          _identityService = identityService;
      }
  
      /* ------------------------------------------------------------ */
      /**
       * @see org.eclipse.jetty.server.Authentication.Deferred#authenticate()
       */
      public Authentication authenticate(ServletRequest request)
      {
          try
          {
              Authentication authentication = _authenticator.validateRequest(request,__deferredResponse,true);
              
              if (authentication!=null && (authentication instanceof Authentication.User) && !(authentication instanceof Authentication.ResponseSent))
              {
                  if (_identityService!=null)
                      _previousAssociation=_identityService.associate(((Authentication.User)authentication).getUserIdentity());
                  return authentication;
              }
          }
          catch (ServerAuthException e)
          {
              Log.debug(e);
          }
          return Authentication.UNAUTHENTICATED;
      }
      
      /* ------------------------------------------------------------ */
      /**
       * @see org.eclipse.jetty.server.Authentication.Deferred#authenticate(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
       */
      public Authentication authenticate(ServletRequest request, ServletResponse response)
      {
          try
          {
             Authentication authentication = _authenticator.validateRequest(request,response,true);
             if (authentication instanceof Authentication.User && _identityService!=null)
                 _previousAssociation=_identityService.associate(((Authentication.User)authentication).getUserIdentity());
             return authentication;
         }
         catch (ServerAuthException e)
         {
             Log.debug(e);
         }
         return Authentication.UNAUTHENTICATED;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @see org.eclipse.jetty.server.Authentication.Deferred#login(java.lang.String, java.lang.String)
      */
     public Authentication login(String username, String password)
     {
         return null; // TODO implement
     }
 
     /* ------------------------------------------------------------ */
     public Object getPreviousAssociation()
     {
         return _previousAssociation;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @param response
      * @return true if this response is from a deferred call to {@link #authenticate(ServletRequest)}
      */
     public boolean isDeferred(HttpServletResponse response)
     {
         return response==__deferredResponse;
     }
     
     /* ------------------------------------------------------------ */
     /* ------------------------------------------------------------ */
     /* ------------------------------------------------------------ */
     static HttpServletResponse __deferredResponse = new HttpServletResponse()
     {
         public void addCookie(Cookie cookie)
         {
         }
 
         public void addDateHeader(String name, long date)
         {
         }
 
         public void addHeader(String name, String value)
         {
         }
 
         public void addIntHeader(String name, int value)
         {
         }
 
         public boolean containsHeader(String name)
         {
             return false;
         }
 
         public String encodeRedirectURL(String url)
         {
             return null;
         }
 
         public String encodeRedirectUrl(String url)
         {
             return null;
         }
 
         public String encodeURL(String url)
         {
             return null;
         }
 
         public String encodeUrl(String url)
         {
             return null;
         }
 
         public void sendError(int sc) throws IOException
         {
         }
 
         public void sendError(int sc, String msg) throws IOException
         {
         }
 
         public void sendRedirect(String location) throws IOException
         {
         }
 
         public void setDateHeader(String name, long date)
         {
         }
 
         public void setHeader(String name, String value)
         {
         }
 
         public void setIntHeader(String name, int value)
         {
         }
 
         public void setStatus(int sc)
         {
         }
 
         public void setStatus(int sc, String sm)
         {
         }
 
         public void flushBuffer() throws IOException
         {
         }
 
         public int getBufferSize()
         {
             return 1024;
         }
 
         public String getCharacterEncoding()
         {
             return null;
         }
 
         public String getContentType()
         {
             return null;
         }
 
         public Locale getLocale()
         {
             return null;
         }
 
         public ServletOutputStream getOutputStream() throws IOException
         {
             return __nullOut;
         }
 
         public PrintWriter getWriter() throws IOException
         {
             return IO.getNullPrintWriter();
         }
 
         public boolean isCommitted()
         {
             return true;
         }
 
         public void reset()
         {
         }
 
         public void resetBuffer()
         {
         }
 
         public void setBufferSize(int size)
         {
         }
 
         public void setCharacterEncoding(String charset)
         {
         }
 
         public void setContentLength(int len)
         {
         }
 
         public void setContentType(String type)
         {
         }
 
         public void setLocale(Locale loc)
         {
         }
 
 	public Collection<String> getHeaderNames()
 	{
 	    return Collections.emptyList();
 	}
 
 	@Override
 	public String getHeader(String arg0)
 	{
 	    return null;
 	}
 
 	@Override
 	public Collection<String> getHeaders(String arg0)
 	{
             return Collections.emptyList();
 	}
 
 	@Override
 	public int getStatus()
 	{
 	    return 0;
 	}
 
     };
 
     /* ------------------------------------------------------------ */
     /* ------------------------------------------------------------ */
     /* ------------------------------------------------------------ */
     private static ServletOutputStream __nullOut = new ServletOutputStream()
     {
         public void write(int b) throws IOException
         {
         }
 
         public void print(String s) throws IOException
         {
         }
 
         public void println(String s) throws IOException
         {
         }
     };
 
     
 }