/*
* Copyright (c) 2006 by Know-Center, Graz, Austria
*
* This software is the confidential and proprietary information of Know-Center,
* Graz, Austria. You shall not disclose such Confidential Information and shall
* use it only in accordance with the terms of the license agreement you entered
* into with Know-Center.
*
* KNOW-CENTER MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
* NON-INFRINGEMENT. KNOW-CENTER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
* LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES.
*
* $Id: Verify.java,v 1.7 2006/10/11 07:39:13 wprinz Exp $
*/
package at.knowcenter.wag.egov.egiz.web.servlets;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import at.knowcenter.wag.egov.egiz.PdfAS;
import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;
import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
import at.knowcenter.wag.egov.egiz.framework.VerificationFilter;
import at.knowcenter.wag.egov.egiz.sig.ConnectorFactory;
import at.knowcenter.wag.egov.egiz.web.FormFields;
import at.knowcenter.wag.egov.egiz.web.LocalRequestHelper;
import at.knowcenter.wag.egov.egiz.web.SessionAttributes;
import at.knowcenter.wag.egov.egiz.web.SessionInformation;
/**
* This method is the verify servlet for the pdf-as web application. It takes
* get and post requests fill out jsp templates and give the user feedback about
* the results of the verify process.
*
* @author wlackner
* @author wprinz
*/
public class VerifyServlet extends HttpServlet
{
/**
* SVUID.
*/
private static final long serialVersionUID = 309198792358636766L;
/**
* The log.
*/
private static Log log = LogFactory.getLog(SignServlet.class);
protected void dispatch(HttpServletRequest request,
HttpServletResponse response, String resource) throws ServletException, IOException
{
response.setContentType("text/html"); //$NON-NLS-1$
response.setCharacterEncoding("UTF-8"); //$NON-NLS-1$
RequestDispatcher disp = getServletContext().getRequestDispatcher(resource);
disp.forward(request, response);
}
protected void dispatchToResults(List results, HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
request.setAttribute("results", results); //$NON-NLS-1$
dispatch(request, response, "/jsp/results.jsp"); //$NON-NLS-1$
}
/**
* Processes the verify upload.
*
* @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,
* javax.servlet.http.HttpServletResponse)
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
try
{
UploadedData ud = retrieveUploadedDataFromRequest(request);
List signature_holders = extractSignatureHoldersFromFile(ud.file_name, ud.file_data);
SessionInformation si = new SessionInformation(); // SessionTable.generateSessionInformationObject();
si.connector = ud.sig_app;
si.application = "verify";
si.mode = null;
si.pdf = null;
si.type = null;
si.user_name = null;
si.user_password = null;
si.signature_holders = signature_holders;
request.getSession().setAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION, si);
if (ud.preview)
{
dispatch(request, response, "/jsp/verifylist.jsp");
// VerifyPreview.formatPreview(signature_holders, connector, request,
// response);
}
else
{
if (ConnectorFactory.isConnectorLocal(si.connector))
{
String dispatch_to = LocalRequestHelper.processLocalVerify(si, si.signature_holders, request, response);
dispatch(request, response, dispatch_to);
return;
}
String host = request.getServerName();
URL loc_ref_URL = new URL(request.getScheme(), host, request.getServerPort(), request.getContextPath() + "/RetrieveSignatureData");
String loc_ref_url = response.encodeURL(loc_ref_URL.toString());
List results = PdfAS.verifySignatureHoldersWeb(signature_holders, si, loc_ref_url);
dispatchToResults(results, request, response);
}
}
catch (FileUploadException e)
{
request.setAttribute("error", "Fehler beim Upload der Daten");
request.setAttribute("cause", "Beim Upload der Daten ist ein Fehler aufgetreten.");
dispatch(request, response, "/jsp/error.jsp");
}
catch (PresentableException e)
{
e.printStackTrace();
SignServlet.prepareDispatchToErrorPage(e, request);
dispatch(request, response, "/jsp/error.jsp");
}
}
protected UploadedData retrieveUploadedDataFromRequest(
HttpServletRequest request) throws ServletException, UnsupportedEncodingException, FileUploadException, PDFDocumentException
{
DiskFileItemFactory fif = new DiskFileItemFactory();
fif.setRepository(SettingsReader.getTemporaryDirectory());
ServletFileUpload sfu = new ServletFileUpload(fif);
List items = sfu.parseRequest(request);
FileItem upload_fi = null;
FileItem connector_fi = null;
// FileItem mode_fi = null;
FileItem preview_fi = null;
{
Iterator it = items.iterator();
while (it.hasNext())
{
FileItem item = (FileItem) it.next();
log.debug("item = " + item.getFieldName()); //$NON-NLS-1$
if (item.isFormField())
{
String item_string = item.getString("UTF-8"); //$NON-NLS-1$
log.debug(" form field string = " + item_string); //$NON-NLS-1$
}
else
{
log.debug(" filename = " + item.getName()); //$NON-NLS-1$
log.debug(" filesize = " + item.getSize()); //$NON-NLS-1$
}
if (item.getFieldName().equals(FormFields.FIELD_UPLOAD))
{
upload_fi = item;
continue;
}
if (item.getFieldName().equals(FormFields.FIELD_CONNECTOR))
{
connector_fi = item;
continue;
}
// if (item.getFieldName().equals(FormFields.FIELD_MODE))
// {
// mode_fi = item;
// continue;
// }
if (item.getFieldName().equals(FormFields.FIELD_PREVIEW))
{
preview_fi = item;
continue;
}
throw new ServletException("unrecognized POST data."); //$NON-NLS-1$
}
}
if (upload_fi == null || connector_fi == null || /* mode_fi == null || */preview_fi == null)
{
throw new ServletException("Unsufficient data provided in request."); //$NON-NLS-1$
}
String connector = connector_fi.getString("UTF-8"); //$NON-NLS-1$
// String mode = mode_fi.getString("UTF-8");
// if (!mode.equals(FormFields.VALUE_MODE_BINARY) &&
// !mode.equals(FormFields.VALUE_MODE_TEXTUAL))
// {
// throw new ServletException("The mode '" + mode + "' is unrecognized.");
// }
String preview_str = preview_fi.getString("UTF-8"); //$NON-NLS-1$
if (!preview_str.equals(FormFields.VALUE_TRUE) && !preview_str.equals(FormFields.VALUE_FALSE))
{
throw new ServletException("The preview '" + preview_str + "' is unrecognized."); //$NON-NLS-1$//$NON-NLS-2$
}
boolean preview = false;
if (preview_str.equals(FormFields.VALUE_TRUE))
{
preview = true;
}
// process the request
log.debug("file content type =" + upload_fi.getContentType()); //$NON-NLS-1$
log.debug("file size = " + upload_fi.getSize()); //$NON-NLS-1$
if (upload_fi.getSize() <= 0)
{
throw new PDFDocumentException(250, "The document is empty."); //$NON-NLS-1$
}
byte[] document_bytes = upload_fi.get();
UploadedData ud = new UploadedData();
ud.preview = preview;
ud.sig_app = connector;
ud.file_name = upload_fi.getName();
ud.file_data = document_bytes;
return ud;
}
protected List extractSignatureHoldersFromFile (String file_name, byte [] data) throws UnsupportedEncodingException, PresentableException
{
VerificationFilter vf = new VerificationFilter();
List signature_holders = null;
String extension = extractExtension(file_name);
String raw_text = null;
if (file_name == null || (extension != null && extension.equals("txt"))) //$NON-NLS-1$
{
raw_text = new String(data, "UTF-8"); //$NON-NLS-1$
signature_holders = vf.extractSignaturesFromPlainText(raw_text);
}
else
{
signature_holders = vf.extractSignaturesFromPdf(data);
}
if (signature_holders.size() == 0)
{
throw new PDFDocumentException(206, "PDF document not signed."); //$NON-NLS-1$
}
return signature_holders;
}
/**
* Extracts the extension from a file name string.
*
*
* The extension of a file name is whatever text follows the last '.'.
*
*
* @param file_name
* The file name.
* @return Returns the extension. If the file name ends with the '.', then an
* empty string is returned. If the file name doesn't contain any '.'
* or file_name is null, null is returned.
*/
public static String extractExtension(String file_name)
{
if (file_name == null)
{
return null;
}
int dot_index = file_name.lastIndexOf('.');
if (dot_index < 0)
{
return null;
}
return file_name.substring(dot_index + 1);
}
protected static class UploadedData
{
protected boolean preview = false;
protected String sig_app = null;
protected String file_name = null;
protected byte[] file_data = null;
}
}