#!/usr/bin/env python3

import logging
import os
import sys

VALID_USER = b"mockmaildir@example.org"
VALID_PW = b"12345"


def main():
    with os.fdopen(3, "rb", buffering=0) as authfd:
        inp = authfd.read(511)

    u, p, *r = inp.split(b"\0")
    if len(r) > 2:
        logging.warning("too many fields!")
        sys.exit(2)

    if r and r[0]:
        raise ValueError("cram currently not supported")
    else:
        if u == VALID_USER and p == VALID_PW:
            os.execvp(sys.argv[1], sys.argv[1:])

    sys.exit(1)


if __name__ == "__main__":
    main()