docker-mailserver/target/bin/excluderelaydomain

#! /bin/bash

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

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

  local DOMAIN="${1}"
  [[ -z ${DOMAIN} ]] && { __usage ; _exit_with_error 'No domain specified' ; }

  _exclude_domain_from_relayhosts
}

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

${ORANGE}USAGE${RESET}
    ./setup.sh relay exclude-domain <SENDER DOMAIN>

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

${ORANGE}DESCRIPTION${RESET}
    When a default relay-host is configured (via ENV), the default behaviour
    is to relay all your mail accounts outgoing mail through that service.

    This command allows to opt-out from that default behaviour by excluding
    all mail accounts belonging to a hosted domain you specify.

${ORANGE}EXAMPLES${RESET}
    ${LWHITE}./setup.sh relay exclude-domain example.com${RESET}
        Any mail submitted from your '@example.com' accounts will be sent
        without relaying through a default relay-host (if one was configured).

${ORANGE}EXIT STATUS${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.

"
}

# Config is for sender dependent relay-host mapping,
# excludes appending a sender from the real generated mapping in `helpers/relay.sh`.
function _exclude_domain_from_relayhosts
{
  local SENDER="@${DOMAIN}"
  local DATABASE_RELAY='/tmp/docker-mailserver/postfix-relaymap.cf'

  # NOTE: No third arg is required.
  # This won't cause any problems, a 'space' will be added with the key.
  # That helps ensure repeat DB edits for the entry match correctly.
  #
  # `helpers/relay.sh` is also fine with this, and will eventually drop
  # the need for this command entirely once that helper is refactored.
  _db_entry_add_or_replace "${DATABASE_RELAY}" "${SENDER}"
}

_main "${@}"