#!/bin/sh

set -e

if [ $# -ne 1 ]; then
    echo $0: "usage: ./generate-dkim.sh domain"
    exit 1
fi

DOMAIN=$1

mkdir -p /tmp/docker-mailserver/opendkim/keys/$DOMAIN

if [ ! -f "/tmp/docker-mailserver/opendkim/keys/$DOMAIN/mail.private" ]; then
	echo "Creating DKIM private key /tmp/docker-mailserver/opendkim/keys/$DOMAIN/mail.private"
	opendkim-genkey --subdomains --domain=$DOMAIN --selector=mail -D /tmp/docker-mailserver/opendkim/keys/$DOMAIN
fi

# Write to KeyTable if necessary
keytableentry="mail._domainkey.$DOMAIN $DOMAIN:mail:/etc/opendkim/keys/$DOMAIN/mail.private"
if [ ! -f "/tmp/docker-mailserver/opendkim/KeyTable" ]; then
	echo "Creating DKIM KeyTable"
	echo $keytableentry > /tmp/docker-mailserver/opendkim/KeyTable
else
	if ! grep -q "$keytableentry" "/tmp/docker-mailserver/opendkim/KeyTable" ; then
	    echo $keytableentry >> /tmp/docker-mailserver/opendkim/KeyTable
	fi
fi

# Write to SigningTable if necessary
signingtableentry="*@$DOMAIN mail._domainkey.$DOMAIN"
if [ ! -f "/tmp/docker-mailserver/opendkim/SigningTable" ]; then
	echo "Creating DKIM SigningTable"
	echo "*@$DOMAIN mail._domainkey.$DOMAIN" > /tmp/docker-mailserver/opendkim/SigningTable
else
	if ! grep -q "$signingtableentry" "/tmp/docker-mailserver/opendkim/SigningTable" ; then
  		echo $signingtableentry >> /tmp/docker-mailserver/opendkim/SigningTable
	fi
fi