#!/usr/bin/python3

import os
import sys

import bs4

with open(sys.argv[1]) as file:
    xml = file.read()

soup = bs4.BeautifulSoup(xml, 'xml')
signature = soup.CompositionPlaylist.Signature
if not signature:
    print("Unsigned CPL")
    sys.exit(0)

number_of_certs = len(signature.KeyInfo.findAll('X509Certificate'))

n = 0
for data in signature.KeyInfo.findAll('X509Certificate'):
    if n == 0:
        name = 'leaf'
    elif n == number_of_certs - 1:
        name = 'root'
    else:
        name = f'inter_{number_of_certs - n - 1}'

    with open(f"{name}.pem", "w") as out:
        print("-----BEGIN CERTIFICATE-----", file=out)
        print(data.text, file=out)
        print("-----END CERTIFICATE-----", file=out)
    os.system(f"openssl x509 -text -in {name}.pem > {name}.dump")
    os.system(f"openssl asn1parse < {name}.pem > {name}.asn1")
    n += 1