firmador.py

# *-* coding: utf-8 *-*
import datetime
from cryptography.hazmat import backends
from cryptography.hazmat.primitives.serialization import pkcs12

from endesive.pdf import cms


def firmar(contraseña, certificado, pdf):
    date = datetime.datetime.utcnow() - datetime.timedelta(hours=12)
    date = date.strftime("D:%Y%m%d%H%M%S+00'00'")
    dct = {
        "aligned": 0,
        "sigflags": 3,
        "sigflagsft": 132,
        "sigpage": 0,
        "sigbutton": True,
        "sigfield": "Signature1",
        "auto_sigfield": True,
        "sigandcertify": True,
        "signaturebox": (470, 840, 570, 640),
        "signature": "Aquí va la firma",
        # "signature_img": "signature_test.png",
        "contact": "hola@ejemplo.com",
        "location": "Ubicación",
        "signingdate": date,
        "reason": "Razón",
        "password": contraseña,
    }
    # with open("cert.p12", "rb") as fp:
    p12 = pkcs12.load_key_and_certificates(
        certificado.read(), contraseña.encode("ascii"), backends.default_backend()
    )

    #datau = open(fname, "rb").read()
    datau = pdf.read()
    datas = cms.sign(datau, dct, p12[0], p12[1], p12[2], "sha256")
    return datau, datas
    """
    fname = "test.pdf"
    with open(fname, "wb") as fp:
        fp.write(datau)
        fp.write(datas)
    """