docker-mailserver/target/bin/addalias

#! /bin/bash

DATABASE=${DATABASE:-/tmp/docker-mailserver/postfix-virtual.cf}

EMAIL="$1"
RECIPIENT="$2"

usage() {
	echo "Usage: addalias <alias@domain> <recipient@other>"
}

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

escape() {
	echo "${1//./\\.}"
}

[ -z "$EMAIL" ] && { usage; errex "no email specified"; }

grep -qi "^$(escape $EMAIL)[a-zA-Z@.\ ]*$(escape $RECIPIENT)" $DATABASE 2>/dev/null &&
	errex "Alias \"$EMAIL $RECIPIENT\" already exists"

if grep -qi "^$(escape $EMAIL)" $DATABASE 2>/dev/null; then
        sed -i "/$EMAIL/s/$/,$RECIPIENT/" $DATABASE
    else
        echo "$EMAIL $RECIPIENT" >> $DATABASE
fi