#!/bin/bash

APIKEY='your-psp-api-key'
KEYFILE='private-key-file.pem'

REQ=$(curl -s http://dyndns.powerserverplus.net/${APIKEY}/update-request)
echo ${REQ}
REQUEST_ID=$(echo ${REQ} | sed -r 's/^.*"id":([0-9]+).*$/\1/')

MESSAGE="request=${REQUEST_ID}"
SIGNATURE=$(echo -n "${MESSAGE}"    | openssl rsautl -inkey ${KEYFILE} -sign | base64 -w 0 | sed 's/+/%2B/g')
UPDATE=$(curl -s http://dyndns.powerserverplus.net/${APIKEY}/update -d "${MESSAGE}&signature=${SIGNATURE}")
echo ${UPDATE}