Cloudflare DNS Updater

update-cloudflare.py

#!/usr/bin/env python3
"""
This script updates Cloudflare DNS A records for specified domains to point to
the current public IP address of the machine running the script. If a domain
does not have an existing A record, it creates one.
"""


import requests
from typing import List, Optional


ZONE = ""
TOKEN = ""
DOMAINS = []


def api_request(method: str, endpoint: str, data: Optional[dict] = None) -> dict:
    url = f"https://api.cloudflare.com/client/v4/{endpoint}"
    headers = {"Authorization": f"Bearer {TOKEN}", "Content-Type": "application/json"}
    response = requests.request(method, url, headers=headers, json=data)
    response.raise_for_status()

    json = response.json()
    if not json.get("success", False):
        raise Exception(f"Cloudflare API error: {json['errors']}")

    return json["result"]


def get_current_ip() -> str:
    response = requests.get("https://api.ipify.org?format=text")
    response.raise_for_status()
    return response.text.strip()


IP = get_current_ip()
print(f"Current IP address: {IP}")

for domain in DOMAINS:
    print(f"Processing domain: {domain}")

    records = api_request("GET", f"zones/{ZONE}/dns_records?type=A&name={domain}")

    if records:
        record = records[0]
        if record["content"] != IP:
            print(f"Updating A record for {domain} from {record['content']} to {IP}")
            api_request(
                "PUT",
                f"zones/{ZONE}/dns_records/{record['id']}",
                data={
                    "type": "A",
                    "name": domain,
                    "content": IP,
                    "ttl": 1,
                    "proxied": False,
                },
            )
        else:
            print(f"A record for {domain} is already up to date.")
    else:
        print(f"Creating new A record for {domain} with IP {IP}")
        api_request(
            "POST",
            f"zones/{ZONE}/dns_records",
            data={
                "type": "A",
                "name": domain,
                "content": IP,
                "ttl": 1,
                "proxied": False,
            },
        )