Cloudflare DDNS bash script

cloudflare-ddns.sh

#!/bin/bash
# cloudflare-ddns.sh
# requires bash, jq and curl to run!
# TODO: error handling :)

# token can be generate from https://dash.cloudflare.com/profile/api-tokens
# requires Zone.DNS permission to update DNS record
# more info on https://api.cloudflare.com/#getting-started-requests
TOKEN="__________"

DNS=(
  "example.com"
  "hello.example.com"
  "my.example.net"
)

ENDPOINT="https://api.cloudflare.com/client/v4"

remoteIP=$(curl -sSX GET "https://api.ipify.org")
echo "Current remote IP address is $remoteIP"

zones=$(curl -sSX GET "$ENDPOINT/zones" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json")

for (( i = 0; i < $(jq ".result | length" <<< $zones); i++ )); do
  zone=$(jq ".result[$i]" <<< $zones)
  zoneID=$(jq -r ".id" <<< $zone)

  records=$(curl -sSX GET "$ENDPOINT/zones/$zoneID/dns_records" \
    -H "Authorization: Bearer $TOKEN" \
    -H "Content-Type: application/json")

  for (( j = 0; j < $(jq ".result | length" <<< $records); j++ )); do
    record=$(jq ".result[$j]" <<< $records)

    recordID=$(jq -r .id <<< $record)
    recordName=$(jq -r ".name" <<< $record)
    recordType=$(jq -r .type <<< $record)
    recordTTL=$(jq -r .ttl <<< $record)

    if [[ "${DNS[*]}" =~ "$recordName" ]]; then
      if [[ "$remoteIP" == "$(jq -r ".content" <<< $record)" ]]; then
        echo "Skipping $recordType record with '$recordName' name"
        continue
      fi

      echo "Updating $recordType record with '$recordName' name"

      curl -sSX PUT "$ENDPOINT/zones/$zoneID/dns_records/$recordID" \
        -H "Authorization: Bearer $TOKEN" \
        -H "Content-Type: application/json; charset=utf-8" \
        -d "{\"content\":\"$remoteIP\",\"type\":\"$recordType\",\"ttl\":$recordTTL}"
    fi
  done
done