#!/bin/bash

# User variables
domain="{{ cloudflare_ddns_domain }}"
zoneid="{{ cloudflare_ddns_zoneid }}"
apikey="{{ cloudflare_ddns_apikey }}"
ipcheck=ifconfig.io
{% raw %}
# Runtime variables
silent=0
dns_record_id=""
wanip=""
dnsip=""

# https://developers.cloudflare.com/api/operations/dns-records-for-a-zone-patch-dns-record

if [[ "${@}" == "--silent" ]]; then silent=1; fi

function prereqs() {
 prereq=('jq' 'curl' 'tr')
 for pre in ${prereq[@]}; do
  which $pre >/dev/null
  if [ $? -ne 0 ]; then echo "Cannot find required tool $pre in path. Pls install tool or fix path."; exit 1; fi
 done
 if [ ${#domain} -eq 0 ]; then echo "domain value cannot be blank. Pls fix in script."; exit 1; fi
 if [ ${#apikey} -eq 0 ]; then echo "apikey value cannot be blank. Pls fix in script."; exit 1; fi
 if [ ${#zoneid} -eq 0 ]; then echo "zoneid value cannot be blank. Pls fix in script."; exit 1; fi
 if [ ${#ipcheck} -eq 0 ]; then echo "ipcheck website cannot be blank. Pls fix in script."; exit 1; fi
}

function getwanip() {
 wanip=$(curl -4 https://${ipcheck} 2>/dev/null)
}

function getdnsip() {
 jsondata=$(curl --request GET \
   --url https://api.cloudflare.com/client/v4/zones/${zoneid}/dns_records?name=${domain} \
   --header 'Content-Type: application/json' \
   --header "Authorization: Bearer ${apikey}" 2>/dev/null)
 success=$(echo $jsondata | jq '.success')
 if [[ "$success" != "true" ]]; then
  if [[ $silent -eq 0 ]]; then
   echo "Unable to get data for dns record $domain in zone $zoneid. Please see the server response below:"
   echo -e "\n${jsondata}\n"
  fi
 exit 1
 fi
 dns_record_id=$(echo $jsondata | jq '.result[0].id' | tr -d \")
 dnsip=$(echo $jsondata | jq '.result[0].content' | tr -d \")
}

function updatedns() {
 jsondata=$(curl --request PATCH \
   --url https://api.cloudflare.com/client/v4/zones/${zoneid}/dns_records/${dns_record_id} \
   --header 'Content-Type: application/json' \
   --header "Authorization: Bearer ${apikey}" \
   --data "{
   'content': '${wanip}',
   'name': '${domain}',
   'type': 'A'
 }" 2>/dev/null)
 success=$(echo $jsondata | jq '.success')
 if [[ "$success" != "true" ]]; then
  if [[ $silent -eq 0 ]]; then
   echo "Unable to update data for dns record $domain in zone $zoneid. Please see the server response below:"
   echo -e "\n${jsondata}\n"
  fi
 exit 1
 fi
}

prereqs
getwanip
getdnsip

if [[ "${wanip}" == "${dnsip}" ]]; then
 if [ $silent -eq 0 ]; then
  echo "WAN IP and DNS IP are the same. Not changing. (W:${wanip} / D:${dnsip})"
 fi
 exit 0
else
 if [ $silent -eq 0 ]; then
  echo "WAN IP and DNS IP do not match. Updating DNS IP. (W:${wanip} / D:${dnsip})"
 fi
  updatedns
 exit 0
fi
{% endraw %}