template-x509-cert-signing/prepare-gpgsm-params

#!/usr/bin/env python3
# PYTHON_ARGCOMPLETE_OK

import dateutil.parser
import pytz


def fill_template(template, subject_keygrip, issuer_keygrip, expiry_datetime):

    print(template.read().strip().format(**{
        'subject-keygrip': subject_keygrip,
        'issuer-keygrip': issuer_keygrip,
        'not-after': dateutil.parser.parse(expiry_datetime)
                        .astimezone(pytz.utc)
                        .replace(tzinfo=None)
                        .isoformat(sep=' '),
    }))


def _init_argparser():

    import argparse
    argparser = argparse.ArgumentParser(description=None)
    argparser.add_argument(
        '--template',
        type=argparse.FileType('r'),
        required=True,
    )
    argparser.add_argument(
        '--subject-keygrip',
        type=str,
        required=True,
    )
    argparser.add_argument(
        '--issuer-keygrip',
        type=str,
        required=True,
    )
    argparser.add_argument(
        '--expiry-datetime',
        type=str,
        required=True,
    )
    return argparser


def main(argv):

    argparser = _init_argparser()
    try:
        import argcomplete
        argcomplete.autocomplete(argparser)
    except ImportError:
        pass
    args = argparser.parse_args(argv)

    fill_template(**vars(args))

    return 0

if __name__ == "__main__":
    import sys
    sys.exit(main(sys.argv[1:]))