DNS record update via godaddy API

godaddy-dns.py

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

import requests


def get_secret(sname):
    fname = os.path.join(os.sep, "etc", "godaddy", sname)
    return subprocess.check_output(["cat", fname]).decode("ascii").strip()

def godaddy_api(path):
    return "https://api.godaddy.com/{}".format(path)

def get_publicip():
    myip_provider = get_secret("myip_provider")
    ip = requests.get(myip_provider).text.strip()

    # Sanity check
    ip_components = [int(x) for x in ip.split(".")]
    assert len(ip_components) == 4
    for ipc in ip_components:
        assert int(ipc) < 256

    return ip


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-f', '--force', action='store_true')
    args = parser.parse_args()

    s = requests.Session()
    s.headers.update({
        "Authorization": "sso-key {}:{}".format(
            get_secret("apikey"),
            get_secret("apisecret"),
        )
    })

    own_ip = get_publicip()
    domain = get_secret("domain")
    rec = get_secret("ddnsrec")

    r = s.get(godaddy_api(
        f"v1/domains/{domain}/records/A/{rec}"
    ))
    rec_ip = r.json()[0]["data"]
    if rec_ip != own_ip or args.force:
        print(f"Updating {rec_ip} => {own_ip}")
        r = s.put(
            godaddy_api(f"v1/domains/{domain}/records/A/{rec}"),
            headers={"Content-Type": "application/json"},
            data=json.dumps([{"data": own_ip}])
        )
        if r.status_code != 200:
            print(json.dumps(r.json(), indent=4))
            r.raise_for_status()

if __name__ == "__main__":
    main()