#!/usr/bin/env bash
# DuckDNS IP-Updater — holt oeffentliche IPv4/IPv6 und meldet sie an DuckDNS.
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=/dev/null
source "${SCRIPT_DIR}/env.homelab"

: "${DUCKDNS_TOKEN:?DUCKDNS_TOKEN fehlt in deploy/env.homelab}"
: "${DUCKDNS_DOMAIN:?DUCKDNS_DOMAIN fehlt in deploy/env.homelab}"

SUBDOMAIN="${DUCKDNS_DOMAIN%%.*}"

IPV4="$(curl -4 -fsS --max-time 15 https://api.ipify.org 2>/dev/null || true)"
IPV6="$(curl -6 -fsS --max-time 15 https://api64.ipify.org 2>/dev/null || true)"

if [[ -z "${IPV4}" && -z "${IPV6}" ]]; then
  echo "duckdns-update: keine oeffentliche IP ermittelbar" >&2
  exit 1
fi

URL="https://www.duckdns.org/update?domains=${SUBDOMAIN}&token=${DUCKDNS_TOKEN}&verbose=true"
[[ -n "${IPV4}" ]] && URL+="&ip=${IPV4}"
[[ -n "${IPV6}" ]] && URL+="&ipv6=${IPV6}"

RESP="$(curl -fsS --max-time 20 "${URL}")"
echo "$(date -Is) duckdns ${SUBDOMAIN}: ${RESP} (v4=${IPV4:-none} v6=${IPV6:-none})"

case "${RESP}" in
  OK*) exit 0 ;;
  *) exit 1 ;;
esac