Bash Script to dynamically update a DNS record (DDNS) using Cloudflare API

cloudflare-dynamic-updater.sh

#!/bin/bash

# This script is made to programmatically update a DNS record managed on Cloudflare via its API. 

# CC BY 4.0 Pablo González Troyano - 2022
    # The script is provided “AS IS” Without warranty of any kind. // Based on cloudflare-ddns-update.sh by Trash2.

# CF API Documentation: https://api.cloudflare.com/

# Update the following variables as needed. 
    zone=example.com
    zone_id=023e105f4ecef8ad9ca31a8372d0c353                 # Just example data, replace with your Zone ID
    record=sub.example.com                                   # Incluiding base domain
    record_id=372e67954025e0ba6aaa6d586b9e0b59               # See below - Just example data, replace with your own. 
    cloudflare_token=c2547eb745079dac93203cc5cfdda41         # See https://dash.cloudflare.com/profile/api-tokens 
    logfile="/home/user/cf-updater.log"                      # Full/Absolute path

# Get your record ID and save in the "record_id" variable. You can get it using:
#    curl -s -X GET "https://api.cloudflare.com/client/v4/zones/${zone_id}/dns_records?type=A&name=${record}" \
#      -H "Authorization: Bearer ${cloudflare_token}" \
#      -H "Content-Type: application/json" | jq -r '{"result"}[] | .[0] | .id'

# Once updated the variables and tested (super important) just add a crontab (using "crontab -e"). 
# For example, every 15 minutes:
# */15 * * * * /bin/bash <PATH-TO-SCRIPT>

# Create (if needed) the log file, and redirect output

    if [ ! -f "$logfile" ]; then
        touch ${logfile}
    fi

# Get and save current IP & current record value
    curr_ip=$(curl -s -X GET https://checkip.amazonaws.com)
    curr_reg=$(dig ${record} +short @1.1.1.1)

# If curr_ip = record IP, do nothing. Else, update. 
    if echo ${curr_reg} | grep ${curr_ip}; then
        echo "$(date --rfc-3339=seconds) - OK - Current record matches current IP (${curr_ip})" >> ${logfile}
    else 
        curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/${zone_id}/dns_records/${record_id}" \
            -H "Authorization: Bearer ${cloudflare_token}" \
            -H "Content-Type: application/json" \
             --data "{\"type\":\"A\",\"name\":\"${record}\",\"content\":\"$curr_ip\",\"ttl\":1,\"proxied\":false}"  > /dev/null
        echo "$(date --rfc-3339=seconds) - NOK - Record Updated to $curr_ip from ${curr_reg}" >> ${logfile}
    fi
# End