/**
 * <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: TextualSignator_1_0_0.java,v 1.3 2006/10/31 08:07:50 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.framework.signators;

import java.io.UnsupportedEncodingException;

import at.gv.egiz.pdfas.framework.input.DataSource;
import at.gv.egiz.pdfas.framework.input.PdfDataSource;
import at.gv.egiz.pdfas.impl.input.TextDataSourceImpl;
import at.knowcenter.wag.egov.egiz.PdfAS;
import at.knowcenter.wag.egov.egiz.PdfASID;
import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;
import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
import at.knowcenter.wag.egov.egiz.framework.SignResult;
import at.knowcenter.wag.egov.egiz.framework.Signator;
import at.knowcenter.wag.egov.egiz.framework.SignatorFactory;
import at.knowcenter.wag.egov.egiz.pdf.IncrementalUpdateInformation;
import at.knowcenter.wag.egov.egiz.pdf.TablePos;
import at.knowcenter.wag.egov.egiz.sig.SignatureDataImpl;
import at.knowcenter.wag.egov.egiz.sig.connectors.bku.BKUPostConnection;

/**
 * Signs a document textually.
 * 
 * <p>
 * In prepareSign, the document text is extracted and normalized.
 * </p>
 * <p>
 * In finishSign, the signed SignatureObject is transformed into a Signature
 * block, which is then written as an Incremental Update.
 * </p>
 * 
 * @author wprinz
 */
public class DetachedfTextualSignator_1_0_0 implements Signator
{
	  /**
	   * The Mime Type.
	   */
	  public static final String MIME_TYPE = "text/xml"; //$NON-NLS-1$
	
  /**
   * The Pdf-AS ID of this Signator.
   */
  public static final PdfASID MY_ID = new PdfASID(SignatorFactory.VENDOR, SignatorFactory.TYPE_DETACHED_TEXTUAL, SignatorFactory.VERSION_1_0_0);
  
  /**
   * @see at.knowcenter.wag.egov.egiz.framework.Signator#getMyId()
   */
  public PdfASID getMyId()
  {
    return MY_ID;
  }

  /**
   * Default constructor.
   */
  public DetachedfTextualSignator_1_0_0()
  {
    // Default constructor.
  }

  /**
   * <p>
   * The parameter has_SIG_ID is not used by this Signator because it doesn't
   * pre-format the signature block.
   * </p>
   * 
   * @see at.knowcenter.wag.egov.egiz.framework.Signator#prepareSign(byte[],
   *      String, TablePos, boolean)
   */
  public IncrementalUpdateInformation prepareSign(PdfDataSource pdf,
      String signature_type, TablePos pos, boolean has_SIG_ID) throws PresentableException
  {
    IncrementalUpdateInformation iui = new IncrementalUpdateInformation();
    iui.original_document = pdf;
    iui.signature_type = signature_type;
    iui.pos = pos;    

    String document_text = PdfAS.extractNormalizedTextTextual(pdf);
    iui.nonTextObjectInfos = PdfAS.extractNonTextualObjects(pdf);
    // logger_.debug("signed_text = " + document_text);
    
    DataSource ds = new TextDataSourceImpl(document_text);
    iui.signature_data = new SignatureDataImpl(ds, MIME_TYPE, "UTF-8"); //$NON-NLS-1$ //$NON-NLS-2$

    return iui;
  }

  /**
   * @see at.knowcenter.wag.egov.egiz.framework.Signator#finishSign(at.knowcenter.wag.egov.egiz.pdf.IncrementalUpdateInformation)
   */
  public SignResult finishSign(IncrementalUpdateInformation iui) throws PresentableException
  {
	  try
	    {
	      String response = iui.signed_signature_object.response_properties.getProperty(BKUPostConnection.RESPONSE_STRING_KEY);
	      byte[] response_bytes = response.getBytes("UTF-8"); //$NON-NLS-1$

	      SignResult sign_result = new SignResult(MIME_TYPE, response_bytes);
	      return sign_result;
	    }
	    catch (UnsupportedEncodingException e)
	    {
	      e.printStackTrace();
	      throw new PDFDocumentException(300, e);
	    }
  }

}