#!/bin/bash

# Forked by benkulbertis/cloudflare-update-record.sh
# CHANGE THESE
auth_email="john.appleseed@example.org"            # The email used to login 'https://dash.cloudflare.com'
auth_key="f1nd7h47fuck1n6k3y1ncl0udfl4r3c0n50l3"   # Top right corner, "My profile" > "Global API Key"
zone_identifier="f1nd7h3fuck1n6z0n31d3n71f13r4l50" # Can be found in the "Overview" tab of your domain
record_name="ipv4.example.org"                     # Which record you want to be synced

# DO NOT CHANGE LINES BELOW
ip4=$(curl -s https://ipv4.icanhazip.com/)
ip6=$(curl -s https://ipv6.icanhazip.com/)

# SCRIPT START
echo "[Cloudflare DDNS] Check Initiated"

# Seek for the record
record4=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name&type=A" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json")
record6=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name&type=AAAA" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json")

# Can't do anything without both record
if [[ $record4 == *"\"count\":0"* || $record6 == *"\"count\":0"* ]]; then
  >&2 echo -e "[Cloudflare DDNS] Dual stack records do not exist, perhaps create them first?"
  exit 1
fi

# Set existing IP address from the fetched record
old_ip4=$(echo "$record4" | grep -Po '(?<="content":")[^"]*' | head -1)
old_ip6=$(echo "$record6" | grep -Po '(?<="content":")[^"]*' | head -1)

# Compare either one is the same
# NOTE: The script will update even one IP remains the same.
if [[ $ip4 == $old_ip4 && $ip6 == $old_ip6 ]]; then
  echo "[Cloudflare DDNS] IPs have not changed."
  exit 0
fi

# Set the record identifier from result
record4_identifier=$(echo "$record4" | grep -Po '(?<="id":")[^"]*' | head -1)
record6_identifier=$(echo "$record6" | grep -Po '(?<="id":")[^"]*' | head -1)

# The execution of update
update4=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record4_identifier" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" --data "{\"id\":\"$zone_identifier\",\"type\":\"A\",\"proxied\":false,\"name\":\"$record_name\",\"content\":\"$ip4\"}")
update6=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record6_identifier" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" --data "{\"id\":\"$zone_identifier\",\"type\":\"AAAA\",\"proxied\":false,\"name\":\"$record_name\",\"content\":\"$ip6\"}")

# The moment of truth
if [[ $update4 == *"\"success\":false"* || $update6 == *"\"success\":false"* ]]; then
  >&2 echo -e "[Cloudflare DDNS] Update failed. DUMPING RESULTS:\n$update4\n$update6"
  exit 1
else
  echo "[Cloudflare DDNS] IPv4 address '$ip4' and IPv6 address '$ip6' has been synced to Cloudflare."
fi