/*
 * Created on 15.12.2003
 *
 * (c) Stabsstelle IKT-Strategie des Bundes
 */
package test.at.gv.egovernment.moa.spss.slinterface;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Properties;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

import at.gv.egovernment.moa.spss.slinterface.Constants;
import at.gv.egovernment.moa.spss.slinterface.Utils;

/**
 * @author Gregor Karlinger (mailto:gregor.karlinger@cio.gv.at) 
 */
public class RewriteServlet extends HttpServlet
{
  private static Logger logger_ = Logger.getLogger(Constants.LH_TEST_);

  public RewriteServlet()
  {
    super();
  }

  /* ---------------------------------------------------------------------------------------------------- */

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException
  {
    // Read content form POST request
    try
    {
      logger_.debug("Received GET request:");
      logger_.debug("Request URI: \"" + request.getRequestURL() + "\"");
      
      Properties initProps = (Properties) this.getServletContext().getAttribute(Constants.WSCP_INIT_PROPS_);
      String paramName = (initProps != null) 
        ? initProps.getProperty(Constants.IP_REW_SLI_URLPARAMNAME_) 
        : null;
      
      if (paramName == null || "".equals(paramName)) 
        throw new ServletException("Could not get rewrite parameter name from init properties."); 
      
      logger_.debug("SLInterface rewrite parameter : \"" + paramName + "\"");
            
      String slInterfaceURLStr = request.getParameter(paramName); 
      URL slInterfaceURL = new URL(slInterfaceURLStr);
      URLConnection slInterfaceURLConn = slInterfaceURL.openConnection();
      
      response.setContentType(slInterfaceURLConn.getContentType());
      
      InputStream slInterfaceIS = slInterfaceURLConn.getInputStream();
      OutputStream responseOS = response.getOutputStream();
      Utils.transferStreams(slInterfaceIS, responseOS);
    }
    catch (Exception e)
    {
      String message = "Failed to get answer from SL interface.";
      logger_.error(message, e);
      throw new ServletException(message, e); 
    }
  }
}