scripts-misc/powerdns/findzone.py

#!/usr/bin/env python3
import subprocess
import os


def findzone(record : str) -> str:
    """Suggest best matching zone from existing zone
    Proposal is done on longer zone names matching the record suffix.
    Example::
        record: a.test.sub.domain.tld
        zone:              domain.tld
        zone:          sub.domain.tld   <== best match
        zone:      another.domain.tld
    :param str record: Record name
    :return: Zone as :class:`string` object or empty :class:`string`
    """
    
    pdnsdomains = subprocess.check_output(["ssh", "-q", str(os.environ.get('PDNS_PRIMARY_SSH')), "pdnsutil", "list-all-zones", "2>", "/dev/null"]).decode('utf-8').split("\n")

    best_match = None
    for zone in pdnsdomains:
        if record.endswith(f".{zone}"):
            if not best_match:
                best_match = zone
            if best_match and len(zone) > len(best_match):
                best_match = zone

    return best_match if best_match else ""