docker-mailserver/target/bin/addalias

#! /bin/bash

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

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

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

\e[38;5;214mNAME\e[39m
    addalias - add an email alias for an existing user

\e[38;5;214mSYNOPSIS\e[39m
    ./setup.sh alias add <EMAIL ADDRESS> <RECIPIENT>

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

\e[38;5;214mEXAMPLES\e[39m
    \e[37m./setup.sh alias add alias-for-me@domain.tld admin@domain.tld\e[39m
        Add the alias alias-for-me@doamin.tld for the existing user
        admin@domain.tld.

\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 ; }

EMAIL="${1}"
RECIPIENT="${2}"

[[ -z ${EMAIL} ]] && { __usage ; errex 'No alias specified' ; }
[[ -z ${RECIPIENT} ]] && { __usage ; errex 'No recipient 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