SignatureAppearanceParameters.java
/*
* Copyright (C) 2016 Hobrasoft s.r.o.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.hobrasoft.pdfmu.operation.signature;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import cz.hobrasoft.pdfmu.operation.args.ArgsConfiguration;
import java.util.Calendar;
import java.util.logging.Logger;
import net.sourceforge.argparse4j.inf.ArgumentGroup;
import net.sourceforge.argparse4j.inf.ArgumentParser;
import net.sourceforge.argparse4j.inf.Namespace;
/**
*
* @author <a href="mailto:filip.bartek@hobrasoft.cz">Filip Bartek</a>
*/
class SignatureAppearanceParameters implements ArgsConfiguration {
public String reason = null;
public String location = null;
public String contact = null;
public Calendar signDate = null;
public int certificationLevel = PdfSignatureAppearance.NOT_CERTIFIED;
private static final Logger logger = Logger.getLogger(SignatureAppearanceParameters.class.getName());
@Override
public void addArguments(ArgumentParser parser) {
ArgumentGroup group = parser.addArgumentGroup("signature metadata");
// TODO: Add description
// The fields are explained in the following documents:
// digitalsignatures20130304.pdf : Section 2.3.3
// http://www.adobe.com/devnet-docs/acrobatetk/tools/DigSig/appearances.html
// https://www.pdfill.com/document_sign.html
group.addArgument("--reason")
.help("What was the reason for signing? (default: <none>)")
.type(String.class);
group.addArgument("--location")
.help("Where was the document signed? (default: <none>)")
.type(String.class);
group.addArgument("--contact")
.help("signer contact information (defualt: <none>)")
.type(String.class);
// TODO: Unify the help strings
}
@Override
public void setFromNamespace(Namespace namespace) {
reason = namespace.getString("reason");
location = namespace.getString("location");
contact = namespace.getString("contact");
// TODO?: Expose `signDate`
// Note: Argparse4j does not seem to support time
// (namely {@link Calendar}) natively.
// TODO?: Expose `certificationLevel`
}
public void configureSignatureAppearance(PdfSignatureAppearance sap) {
assert sap != null;
// Configure signature metadata
if (reason != null) {
logger.info(String.format("Reason: %s", reason));
sap.setReason(reason);
}
if (location != null) {
logger.info(String.format("Location: %s", location));
sap.setLocation(location);
}
if (contact != null) {
logger.info(String.format("Contact: %s", contact));
sap.setContact(contact);
}
if (signDate != null) {
// `setSignDate(null)` crashes
logger.info(String.format("Date: %s", signDate));
sap.setSignDate(signDate);
}
sap.setCertificationLevel(certificationLevel);
// TODO?: Set signer's name
// digitalsignatures20130304.pdf : Code sample 2.12
}
public PdfSignatureAppearance getSignatureAppearance(PdfStamper stp) {
assert stp != null;
// Initialize the signature appearance
PdfSignatureAppearance sap = stp.getSignatureAppearance();
configureSignatureAppearance(sap);
return sap;
}
}