docker-mailserver/target/bin/addalias

#! /bin/bash

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

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

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

${ORANGE}NAME${RESET}
    addalias - add an email alias for an existing user

${ORANGE}SYNOPSIS${RESET}
    ./setup.sh alias add <EMAIL ADDRESS> <RECIPIENT>

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

${ORANGE}EXAMPLES${RESET}
    ${LWHITE}./setup.sh alias add alias-for-me@domain.tld admin@domain.tld${RESET}
        Add the alias alias-for-me@doamin.tld for the existing user
        admin@domain.tld.

${ORANGE}EXIT STATUS${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 ; }

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

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

grep \
  -qi "^$(_escape "${EMAIL}")[a-zA-Z@.\ ]*$(_escape "${RECIPIENT}")" \
  "${DATABASE}" 2>/dev/null && _exit_with_error "Alias \"${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