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# Email server configuration
# Copyright (C) 2023  Nguyễn Gia Phong
#
# This file is part of loang configuration.
#
# Loang configuration is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Loang configuration 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with loang configuration.  If not, see <https://www.gnu.org/licenses/>.

{ config, options, ... }:
let
  certDir = config.security.acme.certs.${hostname}.directory;
  domain = config.networking.domain;
  hostname = "tem.${domain}";
in {
  networking.firewall.allowedTCPPorts = [
    25 # SMTP-MTA
    465 # SMTP-MSA
    993 # IMAPS
  ];

  security = {
    acme.certs.${hostname} = {
      group = config.services.maddy.group;
      webroot = "/var/lib/acme/acme-challenge";
    };
    pam.services.maddy = { };
  };

  services.maddy = {
    config = ''
      auth_map email_localpart
    '' + (builtins.replaceStrings [
      ''
        auth.pass_table local_authdb {
          table sql_table {
            driver sqlite3
            dsn credentials.db
            table_name passwords
          }
        }
      ''
      "imap tcp://0.0.0.0:143"
      "submission tcp://0.0.0.0:587"
    ] [
      ''
        auth.shadow local_authdb {
          debug yes
          use_helper no
        }
      ''
      "imap tls://0.0.0.0:993"
      "submission tls://0.0.0.0:465"
    ] options.services.maddy.config.default);
    enable = true;
    hostname = hostname;
    primaryDomain = domain;
    tls = {
      loader = "file";
      certificates = [{
        certPath = "${certDir}/cert.pem";
        keyPath = "${certDir}/key.pem";
      }];
    };
  };

  users.extraUsers.maddy.extraGroups = [ "shadow" ];
}