karldns.de/karldns/cli.py

from __future__ import annotations

import argparse

from .app import make_app
from .settings import DdnsSettings


def main() -> None:
    parser = argparse.ArgumentParser(prog="karldns")
    subparsers = parser.add_subparsers(dest="command", required=True)

    render_url = subparsers.add_parser("render-fritz-url", help="Print a FRITZ!Box DynDNS update URL.")
    render_url.add_argument("--base-url", required=True, help="Public KarlDNS URL.")
    render_url.add_argument("--update-secret", required=True, help="Private router update secret.")
    render_url.add_argument("--include-ipv6", action="store_true")

    serve = subparsers.add_parser("serve", help="Run the KarlDNS web service.")
    serve.add_argument("--host", default="0.0.0.0")
    serve.add_argument("--port", type=int, default=8080)
    serve.add_argument(
        "--access-log",
        action="store_true",
        help="Enable redacted request logs. Raw web-server access logs stay off because private URLs are secrets.",
    )

    args = parser.parse_args()
    if args.command == "render-fritz-url":
        print(_render_fritz_url(args.base_url, args.update_secret, args.include_ipv6))
    elif args.command == "serve":
        import uvicorn

        settings = DdnsSettings.from_env()
        if not settings.admin_password:
            raise SystemExit("Set DDNS_ADMIN_PASSWORD before starting KarlDNS.")
        if args.access_log:
            settings = settings.model_copy(update={"redacted_access_log": True})
        uvicorn.run(make_app(settings), host=args.host, port=args.port, access_log=False)


def _render_fritz_url(base_url: str, update_secret: str, include_ipv6: bool) -> str:
    base = base_url.rstrip("/")
    url = f"{base}/api/v1/router/update/{update_secret}?myip=<ipaddr>"
    if include_ipv6:
        url += "&myipv6=<ip6addr>"
    return url


if __name__ == "__main__":
    main()