Custom Job: Clear Digital Signatures in PDF

Here are the steps to create a custom job in Qoppa PAS that clears any signatures on the document. Make sure to change the output file path below.

1. Create a custom job through Qoppa Job Creator Wizard and open the job properties to edit the code section.

2. Replace the import section with the following:

import java.io.IOException;
import java.util.Vector;
import java.util.logging.Level;
 
import com.qoppa.pas.api.CustomProcess;
import com.qoppa.pas.api.JobStatus;
import com.qoppa.pas.api.ServerContext;
import com.qoppa.pas.api.WorkingBundle;
import com.qoppa.pdf.PDFException;
import com.qoppa.pdf.form.SignatureField;
import com.qoppa.pdfProcess.PDFDocument;

Replace the process() method stub with the following code:

@Override
public boolean process(ServerContext context, JobStatus jobStatus, WorkingBundle bundle)
{
       // Get the PDF document from the working bundle
       PDFDocument pdfDoc = bundle.getPDFDocument();
 
       // Get a list of the signature fields
       Vector<SignatureField> signatureFields = pdfDoc.getAcroForm().getSignatureFields();
 
       // Loop thru all of the signature fields
       for (SignatureField signatureField : signatureFields)
       {
              if (signatureField.hasBeenSigned())
              {
                     // Clear the signature if it has been signed
                     signatureField.clearSignature();
              }
       }
 
       // Build the output complete file path ***************
       // TODO - This path should be modified
       String outputPath = "C:\\qoppa\\temp\\PAS\\remove_sigs\\output\\" + bundle.getInitialFileName();
 
       try
       {
              // Save the PDF document
              pdfDoc.saveDocument(outputPath);
       }
       catch (IOException | PDFException e)
       {
              context.createLogService().log(Level.WARNING, "Unable to save document to " + outputPath, e);
       }
 
       return true;
}