createLongTermValidity method

Future<bool> createLongTermValidity({ List<List<int>>? publicCertificatesData, RevocationType type = RevocationType.ocspAndCrl, bool includePublicCertificates = false, })

Creates long-term validation of the signature.

// Load the existing PDF document.
PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());
// Create a new PDF document.
PdfSignatureField field = document.form.fields[0] as PdfSignatureField;
// Check if field is signed.
if (field.isSigned) {
  // Create a long-term validation for the signature.
  bool isLTV = await field.signature!
      .createLongTermValidity(includePublicCertificates: true);
}
// Save the document.
List<int> bytes = await document.save();
// Dispose the document.
document.dispose();

Implementation

Future<bool> createLongTermValidity(
    {List<List<int>>? publicCertificatesData,
    RevocationType type = RevocationType.ocspAndCrl,
    bool includePublicCertificates = false}) async {
  final List<X509Certificate> x509CertificateList = <X509Certificate>[];
  if (publicCertificatesData != null) {
    final X509CertificateParser parser = X509CertificateParser();
    for (final List<int> certRawData in publicCertificatesData) {
      final X509Certificate certificate =
          parser.readCertificate(PdfStreamReader(certRawData))!;
      x509CertificateList.add(certificate);
    }
  } else {
    final List<X509Certificate?>? certChain = timestampServer != null
        ? await _helper.getTimestampCertificateChain()
        : _helper.getCertificateChain();
    if (certChain != null) {
      for (final X509Certificate? certificate in certChain) {
        if (certificate != null) {
          x509CertificateList.add(certificate);
        }
      }
      certChain.clear();
    }
  }
  if (x509CertificateList.isNotEmpty) {
    return _helper.getDSSDetails(
        x509CertificateList, type, includePublicCertificates);
  } else {
    return false;
  }
}