#!/usr/bin/env bash

fulldomain="${1}"
token="${2}"
api_url="https://dns.hetzner.com/api/v1"
api_key=${HETZNER_KEY:-''}
zone_id=${HETZNER_ZONE_ID:-''}
zone_name=${HETZNER_ZONE_NAME:-''}

# Verify that required parameters are set
if [[ -z "$fulldomain" ]]; then
  echo "DNS script requires full domain name as first parameter"
  exit 1
fi
if [[ -z "$token" ]]; then
  echo "DNS script requires challenge token as second parameter"
  exit 1
fi
if [[ -z "$HETZNER_KEY" ]]; then
  echo "HETZNER_KEY variable not set"
  exit 1
fi
if [[ -z "$HETZNER_ZONE_ID" && -z "$HETZNER_ZONE_NAME" ]] ; then
  echo "HETZNER_ZONE_ID and HETZNER_ZONE_NAME variables not set"
  exit 1
fi

# Get Zone ID if not set
if [[ -z "$HETZNER_ZONE_ID" ]] ; then
  zone_id=$(curl --silent -X GET "$api_url/zones?name=$zone_name" -H 'Auth-API-Token: '"$api_key"'' | jq -r '.zones[0].id')
  if [[ "$zone_id" == "null" ]] ; then
    echo "Zone ID not found"
    exit 1
  fi
fi

txtname="_acme-challenge.$fulldomain."

# Create TXT record
response=$(curl --silent -X POST "$api_url/records" \
     -H 'Content-Type: application/json' \
     -H "Auth-API-Token: $api_key" \
     -d '{"value": "'"$token"'","ttl": 60,"type": "TXT","name": "'"$txtname"'","zone_id": "'"$zone_id"'"}' \
     -o /dev/null -w '%{http_code}')

if [[ "$response" != "200" ]] ; then
  echo "Record not created"
  echo "Response code: $response"
  exit 1
fi