#!/usr/bin/env bash

sanitize() {
    while read -r data; do
        set -- $data
        printf %q "$1" | sed -e 's/\\ / /g'
    done
}

print_metric() {
    while read -r data; do
        set -- $data
		if [ -f "$1" ]; then
            exp_date=`openssl x509 -enddate --noout -in "$1" | sed -e 's/notAfter=//g'`
            exp_date_unixtime=`date -d "$exp_date" -u +%s`
            cname=`openssl x509 -subject --noout -in "$1" | sed -e 's/^.*CN = //' | sed -e 's/,.*$//' | sanitize`
            filename=`realpath "$1" | sanitize`
            echo "local_x509_expiry_date{cname=\"$cname\",file=\"$filename\"} $exp_date_unixtime"
		fi
    done
}

echo '# HELP local_x509_expiry_date The cert expiry date in unixtime'
echo '# TYPE local_x509_expiry_date gauge'
printf '%s\n' "$@" | print_metric