docker-mailserver/target/bin/addrelayhost

#! /bin/bash

# shellcheck source=../scripts/helper-functions.sh
. /usr/local/bin/helper-functions.sh

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

function __usage
{
  printf "\e[35mADDRELAYHOST\e[31m(\e[93m8\e[31m)

\e[38;5;214mNAME\e[39m
    addrelayhost - add an relay host

\e[38;5;214mSYNOPSIS\e[39m
    ./setup.sh relay add-domain <DOMAIN> <HOST> [<PORT>]

\e[38;5;214mOPTIONS\e[39m
    \e[94mGeneric Program Information\e[39m
        help       Print the usage information.

\e[38;5;214mEXIT STATUS\e[39m
    Exit status is 0 if command was successful. If wrong arguments are provided
    or arguments contain errors, the script will exit early with exit status 1.

"
}

[[ ${1:-} == 'help' ]] && { __usage ; exit 0 ; }

DOMAIN="${1}"
HOST="${2}"
PORT="${3}"

[[ -z ${DOMAIN} ]] && { __usage ; errex 'No domain specified' ; }
[[ -z ${HOST} ]] && { __usage ; errex 'No relay host specified' ; }
[[ -z ${PORT} ]] && PORT=25

if grep -qi "^@${DOMAIN}" "${DATABASE}" 2>/dev/null
then
  sed -i \
    "s|^@${DOMAIN}.*|@${DOMAIN}\t\t[${HOST}]:${PORT}|" \
    "${DATABASE}"
else
  echo -e "@${DOMAIN}\t\t[${HOST}]:${PORT}" >>"${DATABASE}"
fi