Signature field

[Suriyasanjay]

Signature field is not displying pdf file ?

` from pyhanko.sign.fields import append_signature_field, SigFieldSpec
  from pyhanko.pdf_utils.incremental_writer import IncrementalPdfFileWriter
  from pyhanko.sign.signers import PdfSigner
  from pyhanko.keys import load_cert_from_pemder
  from pyhanko.sign import fields
  from pyhanko.sign.fields import SigSeedValueSpec, SigCertConstraints, SigCertConstraintFlags, SigSeedValFlags
  
  
  
  franchising_ca = load_cert_from_pemder('cert.pem')
  
  sv = SigSeedValueSpec(
      reasons=[
          'I vote in favour of the proposed measure',
          'I vote against the proposed measure',
          'I formally abstain from voting on the proposed measure'
      ],
      cert=SigCertConstraints(
          issuers=[franchising_ca],
          flags=SigCertConstraintFlags.ISSUER
      ),
      digest_methods=['sha256', 'sha384', 'sha512'],
      flags=SigSeedValFlags.REASONS | SigSeedValFlags.DIGEST_METHOD
  )
  sp = SigFieldSpec('Signature7', seed_value_dict=sv,
                    box=(200, 100, 400, 160), on_page=0, visible_sig_settings=fields.VisibleSigSettings(rotate_with_page=True, scale_with_page_zoom=True))
  with open('document.pdf', 'rb+') as doc:
      w = IncrementalPdfFileWriter(doc)
      append_signature_field(w, sp)
      w.write_in_place()`

here is the screen shot where there no signature filed after creating

[MatthiasValvekens]

Impossible to say for sure without the actual file, but the vast majority of PDF viewers on Linux don't have built-in signature support and will (at best) render annotation appearance streams only. If your empty signature field has an empty appearance stream (which is the default in pyHanko IIRC), then it won't show up. An actual (visible) signature probably will, though.

[Suriyasanjay]

Even in the chrome it not showed the signature field

[ag-gaphp]

Just FYI, browser PDF readers also do not handle signature fields or esigning. I would try something like Foxit PDF Reader or Adobe Acrobat running in Wine to test and see if your signature fields are there. Adobe being the ultimate test I think since they created PDF (just make sure you uncheck the option to install McAfee when you download it!!!!!!!!!)