#!/usr/bin/env bash
# Need to add your API key below or set as env variable
apikey=${DYNU_API_KEY:-''}

# This script deletes the _acme-challenge TXT record from the dynu.com DNS entry for the domain
# usage dns_del_dynu "domain name"
# return codes are;
# 0 - success
# 1 - error in input
# 2 - error within internal processing
# 3 - error in result ( domain not found in dynu.com etc)

fulldomain="${1}"

API='https://api.dynu.com/v2/dns'

# Check initial parameters
if [[ -z "$fulldomain" ]]; then
  echo "DNS script requires full domain name as first parameter"
  exit 1
fi
if [[ -z "$apikey" ]]; then
  echo "DNS script requires an apikey to be set"
  exit 1
fi

curl_params=( -H "accept: application/json" -H "API-Key: $apikey" -H 'Content-Type: application/json' )

# Get domain id
resp=$(curl --silent "${curl_params[@]}" -X GET "$API")

# Match domain id
re="\"id\":([^,]*),\"name\":\"getssl-testing.freeddns.org\""
if [[ "$resp" =~ $re ]]; then
  domain_id="${BASH_REMATCH[1]}"
fi

if [[ -z "$domain_id" ]]; then
  echo 'Domain name not found on your Dynu account'
  exit 3
fi

# Find existing _acme-challenge TXT record
resp=$(curl --silent "${curl_params[@]}" -X GET "${API}/record/_acme-challenge.${fulldomain}?recordType=TXT")
re="\"id\":([^,]*)"
if [[ "$resp" =~ $re ]]; then
  record_id="${BASH_REMATCH[1]}"
fi

if [[ -z "$record_id" ]]; then
  echo "No _acme-challenge TXT record found for $fulldomain"
  exit 3
fi

resp=$(curl --silent \
  "${curl_params[@]}" \
  -X DELETE "${API}/${domain_id}/record/${record_id}")

# If adding record failed (exception:) then print error message
if [[ "${resp// }" == *'"exception"'* ]]; then
  echo "Error: DNS challenge not added: unknown error - ${resp}"
  exit 3
fi