/**
 * <copyright> Copyright (c) 2006 by Know-Center, Graz, Austria </copyright>
 * 
 * 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: LocalRequestHelper.java,v 1.6 2006/10/31 08:22:04 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.web;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;
import java.util.Properties;

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

import at.gv.egiz.pdfas.impl.input.TextDataSourceImpl;
import at.gv.egiz.pdfas.framework.input.DataSource;
import at.gv.egiz.pdfas.web.CurrentLocalOperation;
import at.gv.egiz.pdfas.web.SignSessionInformation;
import at.gv.egiz.pdfas.web.VerifySessionInformation;
import at.knowcenter.wag.egov.egiz.PdfAS;
import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
import at.knowcenter.wag.egov.egiz.exceptions.ConnectorException;
import at.knowcenter.wag.egov.egiz.exceptions.ConnectorFactoryException;
import at.knowcenter.wag.egov.egiz.exceptions.NormalizeException;
import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
import at.knowcenter.wag.egov.egiz.exceptions.SettingsException;
import at.knowcenter.wag.egov.egiz.exceptions.SignatureException;
import at.knowcenter.wag.egov.egiz.pdf.BinarySignatureHolder;
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.sig.connectors.ConnectorChooser;
import at.knowcenter.wag.egov.egiz.sig.connectors.LocalConnector;
import at.knowcenter.wag.egov.egiz.sig.connectors.bku.SignSignatureObject;
import at.knowcenter.wag.egov.egiz.sig.signatureobject.SignatureObjectHelper;

/**
 * Contains commonly used helper functions for the local request procedure.
 * 
 * @author wprinz
 */
public abstract class LocalRequestHelper
{
  /**
   * The resource of the null request page jsp.
   */
  public static final String NULL_REQUEST_PAGE_JSP = "/jsp/null_request_page.jsp";

  /**
   * The resource of the local connection page jsp.
   */
  public static final String LOCAL_CONNECTION_PAGE_JSP = "/jsp/local_connection_page.jsp";

  /**
   * The resource of the redirect refresh page jsp.
   */
  public static final String REDIRECT_REFRESH_PAGE_JSP = "/jsp/redirect_refresh_page.jsp";

  /**
   * Sets up the local sign procedure.
   * 
   * @param response
   *          The HttpServletResponse the local request page is written to.
   * @throws IOException
   *           Forwarded exception.
   * @throws PresentableException
   *           Forwarded exception.
   */
  public static String processLocalSign(SignSessionInformation si, HttpServletRequest request, HttpServletResponse response) throws IOException, PresentableException
  {
    String host = request.getServerName(); // "129.27.153.77"
    URL loc_ref_URL = new URL(getLocalContextAddress(request, response) + "/RetrieveSignatureData");
    String loc_ref_url = response.encodeURL(loc_ref_URL.toString());

    LocalConnector c = ConnectorChooser.chooseLocalConnectorForSign(si.connector, si.type, loc_ref_url);
    String sign_request = c.prepareSignRequest(si.si.getSignatureData());

    String local_request_url = getLocalServiceAddress(si.type, si.connector);
    si.localRequest = new LocalRequest(local_request_url, sign_request);
    si.outputAvailable = false;
    si.response_properties = null;

    URL data_URL = new URL(request.getScheme(), host, request.getServerPort(), request.getContextPath() + "/DataURL");
    String data_url = response.encodeURL(data_URL.toString());

    request.setAttribute("local_request_url", local_request_url);
    request.setAttribute("data_url", data_url);

    return NULL_REQUEST_PAGE_JSP;

    // TODO old code - remove
    //    
    // LocalConnector local_conn = (LocalConnector)
    // ConnectorFactory.createConnector(si.connector);
    //    
    //
    // // refactor WEB
    // String document_text = "fixme"; //si.iui.document_text;
    // String request_string = local_conn.prepareSignRequest(si.user_name,
    // document_text, si.type);
    // String request_url = local_conn.getSignURL(si.type);
    //
    // LocalRequest local_request = new LocalRequest(request_url,
    // request_string);
    // List local_requests = new ArrayList();
    // local_requests.add(local_request);
    //
    // // ByteArrayOutputStream baos = new ByteArrayOutputStream();
    // // ObjectOutputStream oos = new ObjectOutputStream(baos);
    // // oos.writeObject(local_requests);
    // // oos.close();
    // // baos.close();
    //
    // si.requests = new LocalRequest[1];
    // si.requests[0] = new LocalRequest(local_conn.getSignURL(si.type),
    // request_string);
    // si.current_operation = 0;
    // si.response_properties = new Properties[1];
    // si.response_properties[0] = null;
    //
    // // SessionTable.put(si);
    // request.getSession().setAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION,
    // si);
    //
    // // byte [] requests_bytes = baos.toByteArray();
    // // String base64 = CodingHelper.encodeBase64(requests_bytes);
    //
    // LocalRequestHelper.prepareDispatchToLocalConnectionPage(si.requests[0],
    // request, response);
  }

  /**
   * Sets up the local verify procedure.
   * 
   * @param response
   *          The HttpServletResponse the local request page is written to.
   * @return Returns the JSP location where the calling servlet should dispatch
   *         to.
   * @throws SignatureException
   *           Forwarded exception.
   * @throws NormalizeException
   *           Forwarded exception.
   * @throws IOException
   *           Forwarded exception.
   * @throws ConnectorFactoryException
   *           Forwarded exception.
   * @throws SettingsException 
   * @throws ConnectorException 
   */
  public static String processLocalVerify(VerifySessionInformation si, List holders_to_verify, HttpServletRequest request, HttpServletResponse response) throws SignatureException, NormalizeException,
      IOException, ConnectorFactoryException, SettingsException, ConnectorException
  {
    si.currentLocalOperation = new CurrentLocalOperation();
    si.currentLocalOperation.holders_to_be_verified = holders_to_verify;
    
    si.currentLocalOperation.requests = new LocalRequest[holders_to_verify.size()];
    si.currentLocalOperation.response_properties = new Properties[si.currentLocalOperation.requests.length];
    
    si.currentLocalOperation.current_operation = 0;
//    si.finished = false;

    String host = request.getServerName();
    URL loc_ref_URL = new URL(getLocalContextAddress(request, response) + "/RetrieveSignatureData");
    String loc_ref_url = response.encodeURL(loc_ref_URL.toString());

    for (int i = 0; i < si.currentLocalOperation.requests.length; i++)
    {
      SignatureHolder holder = (SignatureHolder) holders_to_verify.get(i);

      SignatureObject s = holder.getSignatureObject();

      SignatureData sd = PdfAS.convertSignatureHolderToSignatureData(holder);
//      if (holder.getSignatureObject().isBinary())
//      {
//        BinarySignatureHolder bsh = (BinarySignatureHolder) holder;
//        // byte[] data = CodingHelper.decodeBase64(text_to_be_verified);
//        // TODO what about the length of the PDF? is this correct - already deprecated
//        sd = new SignatureDataImpl(bsh.getSignedPdf(), "application/pdf");
//      }
//      else
//      {
//        String text_to_be_verified = holder.getSignedText();
//        DataSource ds = new TextDataSourceImpl(text_to_be_verified);
//        sd = new SignatureDataImpl(ds, "text/plain", "UTF-8");
//      }

      SignSignatureObject so = SignatureObjectHelper.convertSignatureObjectToSignSignatureObject(s);

      LocalConnector local_conn = ConnectorChooser.chooseLocalConnectorForVerify(si.connector, s.getKZ(), so.id, si.type, loc_ref_url);
      String request_string = local_conn.prepareVerifyRequest(sd, so);

      LocalRequest local_request = new LocalRequest("not-needed", request_string);
      si.currentLocalOperation.requests[i] = local_request;
      si.currentLocalOperation.response_properties[i] = null;
    }

    String local_request_url = getLocalServiceAddress(si.type, si.connector);

    URL data_URL = new URL(request.getScheme(), host, request.getServerPort(), request.getContextPath() + "/DataURL");
    String data_url = response.encodeURL(data_URL.toString());

    request.setAttribute("local_request_url", local_request_url);
    request.setAttribute("data_url", data_url);

    return NULL_REQUEST_PAGE_JSP;

    // si.requests = new LocalRequest[holders_to_verify.size()];
    // si.response_properties = new Properties[si.requests.length];
    // si.current_operation = 0;
    // si.finished = false;
    //
    // request.getSession().setAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION,
    // si);
    // // SessionTable.put(si);
    //
    // LocalConnector local_conn = (LocalConnector)
    // ConnectorFactory.createConnector(si.connector);
    //
    // for (int i = 0; i < si.requests.length; i++)
    // {
    // SignatureHolder holder = (SignatureHolder) holders_to_verify.get(i);
    //
    // String text_to_be_verified = holder.getSignedText();
    // // Normalizer normalizer = new Normalizer();
    // // String normalized = normalizer.normalize(holder.signed_text);
    //
    // String request_string =
    // local_conn.prepareVerifyRequest(text_to_be_verified,
    // holder.getSignatureObject());
    //
    // LocalRequest local_request = new
    // LocalRequest(local_conn.getVerifyURL(holder.getSignatureObject().getSignationType()),
    // request_string);
    // si.requests[i] = local_request;
    // si.response_properties[i] = null;
    // }
    //
    // // ByteArrayOutputStream baos = new ByteArrayOutputStream();
    // // ObjectOutputStream oos = new ObjectOutputStream(baos);
    // // oos.writeObject(local_requests);
    // // oos.close();
    // // baos.close();
    //
    // // byte [] requests_bytes = baos.toByteArray();
    // // String base64 = CodingHelper.encodeBase64(requests_bytes);
    //
    // prepareDispatchToLocalConnectionPage(si.requests[0], request, response);
  }

  // what is this for?
//  /**
//   * Sets up the local verify procedure.
//   * 
//   * @param response
//   *          The HttpServletResponse the local request page is written to.
//   * @return Returns the JSP location where the calling servlet should dispatch
//   *         to.
//   * @throws SignatureException
//   *           Forwarded exception.
//   * @throws NormalizeException
//   *           Forwarded exception.
//   * @throws IOException
//   *           Forwarded exception.
//   * @throws ConnectorFactoryException
//   *           Forwarded exception.
//   * @throws SettingsException Forwarded exception.
//   */
//  public static String processLocalVerifyForSingleSignature(VerifySessionInformation si, List holders_to_verify, HttpServletRequest request, HttpServletResponse response) throws SignatureException,
//      NormalizeException, IOException, ConnectorFactoryException, SettingsException
//  {
//    si.requests = new LocalRequest[1];
//    si.response_properties = new Properties[1];
//    si.current_operation = 0;
//    si.finished = false;
//
//    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());
//
//    SignatureHolder holder = (SignatureHolder) holders_to_verify.get(0);
//
//    SignatureObject s = holder.getSignatureObject();
//
//    // TODO This whole processing is unnecessary here because only the mime type is used. - already deprecated
//    // String text_to_be_verified = holder.getSignedText();
//    SignatureData sd = null;
//
//    if (holder.getSignatureObject().isBinary())
//    {
//      BinarySignatureHolder bsh = (BinarySignatureHolder) holder;
//      // byte[] data = CodingHelper.decodeBase64(text_to_be_verified);
//      sd = new SignatureDataImpl(bsh.getSignedPdf(), "application/pdf");
//    }
//    else
//    {
//      String text_to_be_verified = holder.getSignedText();
//      DataSource ds = new TextDataSourceImpl(text_to_be_verified);
//      sd = new SignatureDataImpl(ds, "text/plain", "UTF-8");
//    }
//
//    SignSignatureObject so = SignatureObjectHelper.convertSignatureObjectToSignSignatureObject(s);
//
//    LocalConnector local_conn = ConnectorChooser.chooseLocalConnectorForVerify(si.connector, s.getKZ(), so.id, si.type, loc_ref_url);
//    String request_string = local_conn.prepareVerifyRequest(sd, so);
//
//    LocalRequest local_request = new LocalRequest("not-needed", request_string);
//    si.requests[0] = local_request;
//    si.response_properties[0] = null;
//
//    // TODO read from config - already deprecated
//    String local_request_url = getLocalServiceAddress(si.type, si.connector);
//
//    URL data_URL = new URL(request.getScheme(), host, request.getServerPort(), request.getContextPath() + "/DataURL");
//    String data_url = response.encodeURL(data_URL.toString());
//
//    request.setAttribute("local_request_url", local_request_url);
//    request.setAttribute("data_url", data_url);
//
//    return NULL_REQUEST_PAGE_JSP;
//  }

  /**
   * Formats the OK response from the web application back to the local BKU.
   * 
   * <p>
   * As stated in the BKU tutorial, this response must be plain text "<ok/>".
   * Otherwise BKU will assume a failure.
   * </p>
   * 
   * @param response
   *          The HttpServletResponse to answer to.
   * @throws IOException
   *           Forwarded exception.
   */
  protected static void formatBKUOkResponse(HttpServletResponse response) throws IOException
  {
    response.setContentType("text/plain");
    response.setCharacterEncoding("ISO-8859-1");

    response.getWriter().println("<ok/>");
  }

  /**
   * Prepares the dispatch to the local data connection page.
   * 
   * <p>
   * The calling servlet just has to dispatch to the jsp after calling this
   * method.
   * </p>
   * 
   * @param local_request
   *          The local request. Basically this contains the local service's
   *          target URL and the XML request string.
   * @param response
   *          The HttpServletResponse to write this page to.
   * @throws IOException
   *           Forwarded exception.
   * @throws SignatureException
   *           Forwarded exception.
   * @throws NormalizeException
   *           Forwarded exception.
   */
  public static void prepareDispatchToLocalConnectionPage(LocalRequest local_request, HttpServletRequest request, HttpServletResponse response) throws IOException, SignatureException,
      NormalizeException
  {
    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");

    String local_request_url = local_request.getUrl();

    String quoted_request = makeStringHTMLReady(local_request.getRequestString());

    String host = request.getServerName(); // "129.27.153.77"
    URL data_URL = new URL(request.getScheme(), host, request.getServerPort(), request.getContextPath() + "/AsynchronousDataResponder");
    String data_url = response.encodeURL(data_URL.toString());
    URL redirect_URL = new URL(request.getScheme(), host, request.getServerPort(), request.getContextPath() + "/AsynchronousRedirectResponder");
    String redirect_url = response.encodeURL(redirect_URL.toString());

    request.setAttribute("local_request_url", local_request_url);
    request.setAttribute("quoted_request", quoted_request);
    request.setAttribute("data_url", data_url);
    request.setAttribute("redirect_url", redirect_url);
  }

  public static String makeStringHTMLReady(String input)
  {
    String output = input;

    output = output.replaceAll("&", "&amp;");
    output = output.replaceAll("\"", "&quot;");
    output = output.replaceAll("<", "&lt;");
    output = output.replaceAll(">", "&gt;");
    return output;
  }

  public static String getLocalServerAddress(HttpServletRequest request, HttpServletResponse response)
  {
    String host = request.getServerName();
    URL local_server = null;
    try
    {
       String scheme = request.getScheme();
       int port = request.getServerPort();
       if ("http".equalsIgnoreCase(scheme) && port == 80) {
          local_server = new URL(scheme, host, "/");
       } else if ("https".equalsIgnoreCase(scheme) && port == 443) {
          local_server = new URL(scheme, host, "/");
       } else {
          local_server = new URL(scheme, host, port, "/");
       }
    }
    catch (MalformedURLException e)
    {
      e.printStackTrace();
    }
    String loc_server = response.encodeURL(local_server.toString());

    return loc_server;
  }
  
  public static String getLocalContextAddress(HttpServletRequest request, HttpServletResponse response) {
     String serverURL = getLocalServerAddress(request, response);
     String context = request.getContextPath();
     if (serverURL.endsWith("/") && context.startsWith("/")) {
        context = context.substring(1);
     }
     return serverURL + context;
  }

  /**
   * Returns the URL for accessing the local service.
   * <p>
   * This information is taken from the profile and if not defined from the
   * defaults.
   * </p>
   * <p>
   * E.g. http://127.0.0.1:3495/http-security-layer-request
   * </p>
   * 
   * @param profile
   *          The profile to take the data from.
   * @param device
   *          The service device to be accessed. E.g. bku.
   * @return Returns the URL for accessing the local service.
   * @throws SettingsException F.e.
   */
  public static String getLocalServiceAddress(String profile, String device) throws SettingsException
  {
    SettingsReader settings = SettingsReader.getInstance();

    String url = getConnectorValueFromProfile(settings, profile, device + ".sign.url");

    return url; //"http://127.0.0.1:3495/http-security-layer-request";
  }
  
  /**
   * Reads the configuration entry given by the key, first from the given
   * profile, if not found from the defaults.
   * 
   * @param settings
   *          The settings.
   * @param profile
   *          The profile.
   * @param key
   *          The configuration key.
   * @return Returns the configuration entry.
   */
  public static String getConnectorValueFromProfile(SettingsReader settings,
      String profile, String key)
  {
    String value = settings.getValueFromKey("sig_obj." + profile + "." + key); //$NON-NLS-1$//$NON-NLS-2$
    if (value == null)
    {
      value = settings.getValueFromKey(key);
    }
    return value;
  }

}