#!/bin/sh
set -e

# @NOTE: Directories in /var/mail/vhosts/* need to be owned by the UID/GID defined in custom/41-virtual.cf

DEFAULTS=/defaults
POSTFIX=/etc/postfix
CUSTOM=${POSTFIX}/custom
INCLUDE_DIR=${POSTFIX}/include
NAME="SMTP"

function stop {
	echo "Stopping ${NAME}"
	postfix stop
	kill $(cat /run/saslauthd/saslauthd.pid)
	kill $(cat /run/opendkim/opendkim.pid)
}

trap 'stop' SIGTERM

if [ -z "$@" ]; then
	if [ -z `hostname -d` ]; then
		echo "You must start this container with --hostname= specifying a domain name"
		exit 1
	fi

	# Start some supporting daemons
	/usr/sbin/saslauthd -m /run/saslauthd -ca shadow
	/usr/sbin/opendkim -u opendkim -P /run/opendkim/opendkim.pid

	# Setup our postfix environment
	if [ -d ${INCLUDE_DIR} ]; then
		if  ls -1 ${INCLUDE_DIR}/*.cf >/dev/null 2>&1; then
			echo "* Adding to main.cf"
			echo '##### CUSTOM CONFIGURATION ####' >> ${POSTFIX}/main.cf

			for i in ${INCLUDE_DIR}/*.cf; do
				echo "* Adding [${i}] to main.cf"
				echo "# - ${i}" >> ${POSTFIX}/main.cf
				cat $i >> ${POSTFIX}/main.cf
			done

			echo '##### END CUSTOM CONFIGURATION ####' >> ${POSTFIX}/main.cf
		fi
	fi

	[ ! -f ${CUSTOM}/relay_domains ] && cp ${DEFAULTS}/relay_domains ${CUSTOM}/
	postmap -o lmdb:${CUSTOM}/relay_domains

	[ ! -f ${CUSTOM}/relay_recipient_maps ] && cp ${DEFAULTS}/relay_recipient_maps ${CUSTOM}/
	postmap -o lmdb:${CUSTOM}/relay_recipient_maps

	touch ${CUSTOM}/sasl_passwd
	postmap -o lmdb:${CUSTOM}/sasl_passwd

	[ -n "${VIRTUAL_ALIAS_DOMAINS}" ] && sed -i -e "s%#virtual_alias_domains = @VIRTUAL_ALIAS_DOMAINS@%virtual_alias_domains = ${VIRTUAL_ALIAS_DOMAINS}%" ${POSTFIX}/main.cf
	[ ! -f ${CUSTOM}/virtual_alias_maps ] && cp ${DEFAULTS}/virtual_alias_maps ${CUSTOM}/
	postmap -o lmdb:${CUSTOM}/virtual_alias_maps

	[ -n "${VIRTUAL_DOMAINS}" ] && sed -i -e "s%#virtual_mailbox_domains = @VIRTUAL_DOMAINS@%virtual_mailbox_domains = ${VIRTUAL_DOMAINS}%" ${POSTFIX}/main.cf
	[ ! -f ${CUSTOM}/virtual_mailbox_maps ] && cp ${DEFAULTS}/virtual_mailbox_maps ${CUSTOM}/
	postmap -o lmdb:${CUSTOM}/virtual_mailbox_maps

	# Create some default LDAP templates
	if [ -n  "${LDAP_SEARCH_BASE}" ]; then
		sed -i -e "s%^# ldap:% ldap:%" ${POSTFIX}/main.cf

		if [ ! -f ${CUSTOM}/ldap_virtual_alias_maps ]; then
			cp ${DEFAULTS}/ldap_virtual_alias_maps ${CUSTOM}/
			sed -i -e "s%@THIS_HOST@%${HOSTNAME}%" -e "s%@LDAP_SEARCH_BASE@%${LDAP_SEARCH_BASE}%" ${CUSTOM}/ldap_virtual_alias_maps
		fi
		if [ ! -f ${CUSTOM}/ldap_virtual_mailbox_maps ]; then
			cp ${DEFAULTS}/ldap_virtual_mailbox_maps ${CUSTOM}/
			sed -i -e "s%@THIS_HOST@%${HOSTNAME}%" -e "s%@LDAP_SEARCH_BASE@%${LDAP_SEARCH_BASE}%" ${CUSTOM}/ldap_virtual_mailbox_maps
		fi
		if [ ! -f ${CUSTOM}/ldap_relay_domains ]; then
			cp ${DEFAULTS}/ldap_relay_domains ${CUSTOM}/
			sed -i -e "s%@THIS_HOST@%${HOSTNAME}%" -e "s%@LDAP_SEARCH_BASE@%${LDAP_SEARCH_BASE}%" ${CUSTOM}/ldap_relay_domains
		fi
		if [ ! -f ${CUSTOM}/ldap_relay_recipient_maps ]; then
			cp ${DEFAULTS}/ldap_relay_recipient_maps ${CUSTOM}/
			sed -i -e "s%@THIS_HOST@%${HOSTNAME}%" -e "s%@LDAP_SEARCH_BASE@%${LDAP_SEARCH_BASE}%" ${CUSTOM}/ldap_relay_recipient_maps
		fi
	fi

	newaliases
	postfix start

	# Sleep,enabling our SIGTERM to shut us down gracefully
	(while true; do sleep 3600; done) &
	wait
else
	exec $@
fi