# cert checker
import hashlib
import base64
import os
import subprocess
import ssl
import pprint
from cryptography import x509
from cryptography.hazmat.backends import default_backend
import OpenSSL
from pyasn1_modules import pem, rfc2459
from pyasn1.codec.der import decoder


hostname = 'www.facebook.com'
port = 443

cert = ssl.get_server_certificate((hostname, port))
print(cert)

f = open('cert.cer', 'w')
f.write(cert)


substrate = pem.readPemFromFile(open('cert.cer'))
try:
  certde = decoder.decode(substrate, asn1Spec=rfc2459.Certificate())[0]
  print(certde.prettyPrint())
except Exception as e:
  print("Error decoding certificate 1")


# with open(f, "r", encoding='utf-8') in files:
#   print("Wynik nazwa {}".format(name, data))
pem_data = cert
cert_file_name = os.path.join(os.path.dirname(__file__), "cert.cer")
try:
  certde = ssl._ssl._test_decode_cert(cert_file_name)
  pprint.pprint(certde)
except Exception as e:
  print("Error decoding certificate 2")

try:
  x509.load_pem_x509_certificate(pem_data, default_backend())
  print(certde.serial_number)
  print(certde.not_valid_after)
except Exception as e:
  print("Error decoding certificate 3")

try:
  cert_txt = subprocess.check_output(
      ["openssl", "x509", "-in", cert_file_name, "-text", "-noout"])
  print(cert_text)
except Exception as e:
  print("Error decoding certificate 4")