scripts/make_passcode.py

"""Create the passcode for the Nova page and the hash to store as a secret.

    python scripts/make_passcode.py            # generates a random passcode
    python scripts/make_passcode.py --ask      # type your own (not echoed)

Paste the printed hash into the Space secret NOVA_PASSCODE_HASH. The passcode
itself is shown once and stored nowhere -- share it only with people who
should be able to talk to the Pi.
"""
from __future__ import annotations

import argparse
import getpass
import secrets
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

import token_service  # noqa: E402


def main() -> None:
    ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])
    ap.add_argument("--ask", action="store_true", help="type a passcode instead of generating one")
    args = ap.parse_args()
    if args.ask:
        passcode = getpass.getpass("Passcode: ")
        if passcode != getpass.getpass("Again: "):
            sys.exit("passcodes differ")
        if len(passcode) < 8:
            sys.exit("use at least 8 characters")
    else:
        passcode = secrets.token_urlsafe(9)
        print(f"Passcode (shown once): {passcode}")
    print(f"NOVA_PASSCODE_HASH={token_service.hash_passcode(passcode)}")


if __name__ == "__main__":
    main()