nixos-mailserver/mail-server/common.nix

#  nixos-mailserver: a simple mail server
#  Copyright (C) 2016-2017  Robin Raymond
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program. If not, see <http://www.gnu.org/licenses/>

{ config, lib }:

let
  cfg = config.mailserver;
  inherit (lib.strings) stringToCharacters;
in
{
  # cert :: PATH
  certificatePath = if cfg.certificateScheme == 1
             then cfg.certificateFile
             else if cfg.certificateScheme == 2
                  then "${cfg.certificateDirectory}/cert-${cfg.domain}.pem"
                  else if cfg.certificateScheme == 3
                       then "/var/lib/acme/mailserver/fullchain.pem"
                       else throw "Error: Certificate Scheme must be in { 1, 2, 3 }";

  # key :: PATH
  keyPath = if cfg.certificateScheme == 1
        then cfg.keyFile
        else if cfg.certificateScheme == 2
             then "${cfg.certificateDirectory}/key-${cfg.domain}.pem"
              else if cfg.certificateScheme == 3
                   then "/var/lib/acme/mailserver/key.pem"
                   else throw "Error: Certificate Scheme must be in { 1, 2, 3 }";

  # appends cfg.domain to argument if it does not contain "@"
  qualifyUser = user: (
        if (builtins.any (c: c == "@") (stringToCharacters user))
        then user
        else "${user}@${cfg.domain}");
}