Auto-renew SSL script for a user & domain (Webmin or another control panel)

letsencrypt_auto_renew_ssl.sh

#!/bin/bash
# Auto-renew SSL script for a user & domain
# Can be used in Webmin for example
#   Webmin has better integration but I believe it requires newer versions of python for now

DOMAINUSER="$1"
DOMAIN="$2"

if [ "$#" -ne "2" ]; then
        echo "Bad usage: $0 <domain_user> <domain>\n"
        exit 2;
fi

if [ !-d "/home/$DOMAINUSER/ssl_certificates/" ]; then
        sudo -u $DOMAINUSER -H bash -c "mkdir -p /home/$DOMAINUSER/ssl_certificates/"
fi

cd /root/letsencrypt/
./letsencrypt-auto certonly --debug --email admin@$DOMAIN --agree-tos --webroot --renew-by-default -w /home/$DOMAINUSER/public_html/ -d $DOMAIN -d www.$DOMAIN --authenticator webroot
cp -vf /etc/letsencrypt/live/$DOMAIN/cert.pem     /home/$DOMAINUSER/ssl_certificates/${DOMAIN}_cert.pem
cp -vf /etc/letsencrypt/live/$DOMAIN/chain.pem    /home/$DOMAINUSER/ssl_certificates/${DOMAIN}_chain.pem
cp -vf /etc/letsencrypt/live/$DOMAIN/fullchain.pem /home/$DOMAINUSER/ssl_certificates/${DOMAIN}_fullchain.pem
cp -vf /etc/letsencrypt/live/$DOMAIN/privkey.pem   /home/$DOMAINUSER/ssl_certificates/${DOMAIN}_privkey.pem