docker-mailserver/target/bin/addrelayhost

#! /bin/bash

# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh

DATABASE='/tmp/docker-mailserver/postfix-relaymap.cf'

function __usage
{
  printf '%s' "${PURPLE}ADDRELAYHOST${RED}(${YELLOW}8${RED})

${ORANGE}NAME${RESET}
    addrelayhost - add an relay host

${ORANGE}SYNOPSIS${RESET}
    ./setup.sh relay add-domain <DOMAIN> <HOST> [<PORT>]

${ORANGE}OPTIONS${RESET}
    ${BLUE}Generic Program Information${RESET}
        help       Print the usage information.

${ORANGE}EXIT STATUS${RESET}
    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 ; _exit_with_error 'No domain specified' ; }
[[ -z ${HOST} ]] && { __usage ; _exit_with_error '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