update dynamic dns IP for digital ocean

update_drop_dyn.sh

#!/bin/bash
# No Fallback, no error handling
# crontab -e 
# hourly
# 0 * * * * <PATH-TO-SCRIPT>/update_drop_dyn.sh $api_key $domain $record > <PATH-TO-LOGFILE> 2>&1
#####
# note: don't forget to add a trailing colon(:) to the $api_key to avoid a password prompt from the api

api_key="$1"
domain="$2"
record_id="$3"

function get_externalIP {
	curl -s http://checkip.dyndns.org | sed 's/[a-zA-Z/<> :]//g' | tr -d '\r'
}

externalIP_new=$(get_externalIP)

function update_record {
    curl -X PUT -H 'Content-Type: application/json' -u ${api_key} -d '{"name":"home","data":"'${externalIP_new}'"}' "https://api.digitalocean.com/v2/domains/${domain}/records/${record_id}"
}

update_record