Python script to update A root ("@") record with hetzner dns

dyndns.py

#!/usr/bin/env python3

import requests
import json
import os
from http.client import responses

token = os.environ.get("HETZNER_API_TOKEN")  # abc123
zone_name = os.environ.get("HETZNER_DYNDNS_ZONE")  # "mydomain.com"
ntfy_topic = os.environ.get("HETZNER_NTFY_TOPIC")  # ntfy.sh/...  my_topic_name

if token is None or zone_name is None:
    exit(1)


def notify_exit(code, message):
    if ntfy_topic is not None:
        code_str = None
        try:
            code_str = responses[code]
        except KeyError:
            code_str = code

        requests.post(
            f"https://ntfy.sh/{ntfy_topic}",
            data=f"{message} | Code: {code}".encode('utf-8'),
            headers={
                "Title": "dynDNS-Error",
                "Priority": "4",
                "Tags": "globe_with_meridians,skull"
            }
        )

    exit(code)


zones = requests.get(
    url="https://dns.hetzner.com/api/v1/zones",
    headers={"Auth-API-Token": token}
)

if zones.status_code != 200:
    notify_exit(zones.status_code, "Zones request failed")

zones = zones.json()["zones"]

zone_id = None
for zone in zones:
    if zone["name"] == zone_name:
        zone_id = zone["id"]
        break

if zone_id is None:
    notify_exit(1, f"No zone with name {zone_name}")

records = requests.get(
    url="https://dns.hetzner.com/api/v1/records",
    params={"zone_id": zone_id},
    headers={"Auth-API-Token": token}
)

if records.status_code != 200:
    notify_exit(records.status_code, "Records request failed")

records = records.json()["records"]

record_id = None
for record in records:
    if record["type"] == "A" and record["name"] == "@":
        record_id = record["id"]
        break

if record_id is None:
    notify_exit(1, "No root-zone in records")

ip = requests.get(url="https://icanhazip.com")
if ip.status_code != 200:
    notify_exit(ip.status_code, "IP request failed")

ip = ip.content.decode().removesuffix("\n")

put_response = requests.put(
    url=f"https://dns.hetzner.com/api/v1/records/{record_id}",
    headers={"Auth-API-Token": token, "Content-Type": "application/json"},
    data=json.dumps(
        {"value": ip, "type": "A", "name": "@", "zone_id": zone_id}
    ),
)

if put_response.status_code != 200:
    notify_exit(put_response.status_code, "PUT request failed")