#! /bin/bash

MODE="$1"
USER="$3"

usage() {
	echo "Usage: $0 <add|del|list> <send|receive> [<email@domain.com>]"
}

raise() {
	echo "$@" 1>&2
	exit 1
}

escape() {
	echo "${1//./\\.}"
}
[ -z "$MODE" ] && raise "missing parameters: <add|del|list> <send|receive> [<email@domain.com>]"

case $2 in
	send)
		DATABASE="/tmp/docker-mailserver/postfix-send-access.cf"
		;;
	receive)
		DATABASE="/tmp/docker-mailserver/postfix-receive-access.cf"
		;;
	*)
		usage; raise "missing parameters. Specify \"send\" or \"receive\"";
		;;
esac

if [ -z "$USER" ] && [ "$MODE" != list ]; then
	read -p "User(user@domain.com): " USER
	echo
	[ -z "$USER" ] && raise "User must not be empty"
fi



case $MODE in
	add)
		grep -qi "^$(escape "$USER")" $DATABASE 2>/dev/null &&
			raise "User \"$USER\" already denied to $2 mails"
		if [ ! -f $DATABASE ]; then
			[[ $DATABASE = *"send"* ]] && \
					sed -i 's|smtpd_sender_restrictions =|smtpd_sender_restrictions = check_sender_access texthash:/tmp/docker-mailserver/postfix-send-access.cf,|' /etc/postfix/main.cf \
				|| sed -i 's|smtpd_recipient_restrictions =|smtpd_recipient_restrictions = check_recipient_access texthash:/tmp/docker-mailserver/postfix-receive-access.cf,|'  /etc/postfix/main.cf
			service postfix reload > /dev/null
		fi
		echo -e "$USER \t\t REJECT" >>$DATABASE
	;;
	del)
		sed -ie "/^$(escape "$USER")/d" $DATABASE 2>/dev/null ||
			raise "User \"$USER\" not found."
	;;
	list)
		grep "REJECT" $DATABASE 2>/dev/null ||
		    echo "Everyone is allowed to $2 mails."
    ;;
	*)
		usage; raise "missing mode. Specify \"add\", \"del\" or \"list\"";
	;;
esac