feat: hectic-lab: mail server

nixos/module/hectic/archetype/base.nix

@@ -12,6 +12,7 @@
 in {
   imports = [
     inputs.disko.nixosModules.default
+    inputs.nixos-mailserver.nixosModules.mailserver
   ];
 
   options.hectic.archetype.base.enable = lib.mkEnableOption "Enable archetupe.dev";

nixos/module/hectic/service/mailserver.nix

@@ -0,0 +1,62 @@
+{
+  inputs,
+  flake,
+  self,
+}:
+{
+  lib,
+  config,
+  ...
+}: let
+  cfg = config.services.mailserver;
+  transformLoginAccounts = domain: input:
+    builtins.listToAttrs (map (key: {
+      name  = key + "@" + domain;
+      value = input.${key};
+    }) (builtins.attrNames input));
+in {
+  options = {
+    services.mailserver.enable = lib.mkEnableOption "Mail server";
+
+    services.mailserver.domain = lib.mkOption {
+      type        = lib.types.str;
+      description = "The domain name of the mail server";
+    };
+
+    services.mailserver.loginAccounts = lib.mkOption {
+      type = lib.types.attrsOf (lib.types.submodule {
+        options = {
+          hashedPassword = lib.mkOption {
+            type    = lib.types.nullOr lib.types.str;
+            default = null;
+          };
+          hashedPasswordFile = lib.mkOption {
+            type        = lib.types.nullOr lib.types.str;
+            default     = null;
+            description = ''
+              Full path to a file containing the hashed password suitable
+              for use with `chpasswd -e`.
+            '';
+          };
+        };
+      });
+      default     = {};
+      description = "Login accounts for the mail server";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    mailserver = {
+      enable   = true;
+      fqdn     = "mail." + cfg.domain;
+      domains  = [ cfg.domain ];
+
+      loginAccounts = transformLoginAccounts cfg.domain cfg.loginAccounts;
+
+      certificateScheme = "acme-nginx";
+    };
+
+    security.acme.acceptTerms       = true;
+    security.acme.defaults.email    = "security@" + cfg.domain;
+  };
+}