/**
 * 
 */
package at.knowcenter.wag.egov.egiz.web.servlets;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import at.knowcenter.wag.egov.egiz.pdf.SignatureHolder;
import at.knowcenter.wag.egov.egiz.sig.SignatureData;
import at.knowcenter.wag.egov.egiz.sig.SignatureDataImpl;
import at.knowcenter.wag.egov.egiz.sig.SignatureObject;
import at.knowcenter.wag.egov.egiz.tools.CodingHelper;
import at.knowcenter.wag.egov.egiz.web.SessionAttributes;
import at.knowcenter.wag.egov.egiz.web.SessionInformation;

/**
 * Retrieves the Signature Data from the session and returns it.
 * 
 * @author wprinz
 */
public class RetrieveSignatureDataServlet extends HttpServlet
{

  /**
   * SVUID.
   */
  private static final long serialVersionUID = -5387006236836240538L;

  /**
   * The log.
   */
  private static Log log = LogFactory.getLog(RetrieveSignatureDataServlet.class);

  /**
   * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
   */
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    log.debug("Request for receiving signature data."); //$NON-NLS-1$
    
    HttpSession session = request.getSession(false);
    if (session == null)
    {
      String msg = "There is no session associated with this request."; //$NON-NLS-1$
      log.error(msg);
      throw new ServletException(msg);
    }
    
    SessionInformation si = (SessionInformation) session.getAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION);
    if (si == null)
    {
      String msg = "The session is not found or no longer valid."; //$NON-NLS-1$
      log.error(msg);
      throw new ServletException(msg);
    }
    
    SignatureData sd = null;
    if (si.application.equals("sign"))
    {
      sd = si.iui.signature_data;
    }
    else
    {
      SignatureHolder holder = (SignatureHolder) si.signature_holders.get(si.current_operation);
      SignatureObject s = holder.getSignatureObject();
      
      // TODO make better
      String text_to_be_verified = holder.getSignedText();
      if (holder.getSignatureObject().isBinary())
      {
        byte[] data = CodingHelper.decodeBase64(text_to_be_verified);
        sd = new SignatureDataImpl(data, "application/pdf");
      }
      else
      {
        sd = new SignatureDataImpl(text_to_be_verified.getBytes("UTF-8"), "text/plain", "UTF-8");
      }

    }

    log.debug("Writing " + sd.getMimeType() + " data:"); //$NON-NLS-1$ //$NON-NLS-2$
    
    response.setContentType(sd.getMimeType());
    response.setCharacterEncoding(sd.getCharacterEncoding());
    //response.getOutputStream().write(sd.getData());
    
    //::::
    InputStream is = new ByteArrayInputStream(sd.getData());
    final int bufferSize = 1024;
    byte[] buffer = new byte[bufferSize];
    int len = -1;
    while ((len = is.read(buffer)) != -1) {
    	response.getOutputStream().write(buffer, 0, len);
    }
    response.getOutputStream().flush();
    //::::
    
    log.debug("Writing SignatureData finished."); //$NON-NLS-1$
  }

  
}