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#!/usr/bin/env bash
set -e
# Check I'm root.
if [[ $EUID -ne 0 ]]; then
echo "This script must be run as root" 1>&2
exit 1
fi
# Check certbot version.
certbot --version
# Check CRUPEST_AUTO_CERTBOT_RENEW_COMMAND is defined.
if [ -z "$CRUPEST_AUTO_CERTBOT_RENEW_COMMAND" ]; then
echo "CRUPEST_AUTO_CERTBOT_RENEW_COMMAND is not defined or empty"
CRUPEST_AUTO_CERTBOT_RENEW_COMMAND="certbot renew -n --webroot -w /var/www/certbot"
printf "Will use:\n%s\n" "$CRUPEST_AUTO_CERTBOT_RENEW_COMMAND"
else
printf "CRUPEST_AUTO_CERTBOT_RENEW_COMMAND is defined as:\n%s\n" "$CRUPEST_AUTO_CERTBOT_RENEW_COMMAND"
fi
# Check CRUPEST_CERT_PATH, default to /etc/letsencrypt/live/$CRUPEST_DOMAIN/fullchain.pem
if [ -z "$CRUPEST_CERT_PATH" ]; then
CRUPEST_CERT_PATH="/etc/letsencrypt/live/$CRUPEST_DOMAIN/fullchain.pem"
fi
# Check CRUPEST_CERT_PATH exists.
if [ ! -f "$CRUPEST_CERT_PATH" ]; then
echo "Cert file does not exist"
exit 1
fi
function check_and_renew_cert {
expire_info=$(openssl x509 -enddate -noout -in "$CRUPEST_CERT_PATH")
# Get ssl certificate expire date.
expire_date=$(echo "$expire_info" | cut -d= -f2)
echo "SSL certificate expire date: $expire_date"
# Convert expire date to UNIX timestamp.
expire_timestamp="$(date -d "$expire_date" +%s)"
# Minus expire timestamp with 30 days in UNIX timestamp.
renew_timestamp="$((expire_timestamp - 2592000))"
echo "Renew SSL certificate at: $(date -d @$renew_timestamp)"
# Get rest time til renew.
rest_time_in_second="$((renew_timestamp - $(date +%s)))"
rest_time_in_day=$((rest_time_in_second / 86400))
echo "Rest time til renew: $rest_time_in_second seconds, aka, about $rest_time_in_day days"
# Do we have rest time?
if [ $rest_time_in_second -gt 0 ]; then
# Sleep 1 hour.
echo "I'm going to sleep for 1 day to check again."
sleep 1d
else
# No, renew now.
echo "Renewing now..."
# Run CRUPEST_AUTO_CERTBOT_RENEW_COMMAND
if [ -n "$CRUPEST_AUTO_CERTBOT_POST_HOOK" ]; then
$CRUPEST_AUTO_CERTBOT_RENEW_COMMAND --post-hook "$CRUPEST_AUTO_CERTBOT_POST_HOOK"
else
$CRUPEST_AUTO_CERTBOT_RENEW_COMMAND
fi
fi
}
# Run check_and_renew_cert in infinate loop.
while true; do
check_and_renew_cert
done
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