#!/bin/bash
# Do an action if cert changed
# do_action_if_cert_changed.sh
# Urheber Ralph Hahn, Seif-Wald-Ring 26, 54329 Konz-Roscheid
# This script is distributed in the hope that it will be useful, but without any guarantees;
# without even the implied warranties of merchantability or fitness for a particular purpose.
# See the GNU General Public License for more information. See file: license.txt - http://www.gnu.org/licenses/gpl.html
# You can use and redistribute this file freely under the terms of the GNU General Public License.
# You can make changes or customize. Caution: incorrect declarations can cause problems!
# Always test individual changes immediately before making further ones.
#
# create folder sysadm in homes /volume1/homes/sysadm or any other you want
# create folder do_action_if_cert_changed in sysadm /volume1/homes/sysadm/do_action_if_cert_changed
# create folder log in sysadm/do_action_if_cert_changed /volume1/homes/sysadm/do_action_if_cert_changed/log
#
# save this script as /volume1/homes/sysadm/do_action_if_cert_changed/do_action_if_cert_changed.sh
#
# Set a task in task-scheduler: user root | every day | bash /volume1/homes/sysadm/do_action_if_cert_changed/do_action_if_cert_changed.sh	
#

typeset -i FILEDATECERT FILEDATEDO 

CERTPATH="/usr/syno/etc/certificate/_archive/$(cat /usr/syno/etc/certificate/_archive/DEFAULT)"

LOGFILE="/volume1/homes/sysadm/do_action_if_cert_changed/log/do_action_if_cert_changed_$(date '+%Y%m').log"

LASTCHANGE="/volume1/homes/sysadm/do_action_if_cert_changed/do-lastchange"

CERTFILE=$CERTPATH/fullchain.pem
FILEDATECERT=$(date --reference=${CERTFILE} +%Y%m%d)

if [ -f $LASTCHANGE ];
then
	FILEDATEDO=$(cat "$LASTCHANGE")
else
	FILEDATEDO=0	
fi

if [[ ${FILEDATEDO} -ge ${FILEDATECERT} ]];then
	echo "${FILEDATEDO} ${FILEDATECERT} Nothing todo!" >> "$LOGFILE"
	exit
fi

# define your action here, set ACTION to anything if done
# action begin

# action end

if [ -z "$ACTION" ]
  then
    echo "${FILEDATEDO} ${FILEDATECERT} do_action_if_cert_changed failed." >> "$LOGFILE"
	echo "0" > "$DOFILE"
  else
    echo "${FILEDATEDO} ${FILEDATECERT} do_action_if_cert_changed done." >> "$LOGFILE"
    echo $FILEDATECERT > "$LASTCHANGE"		
fi