add nix tooling (default.nix and flake support)

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

.gitignore

@@ -11,4 +11,7 @@ devenv.local.nix
 config.ini
 *.pfx
 *.crt
-*.pem
+*.pem
+
+# nix
+result

default.nix

@@ -0,0 +1,31 @@
+{ pkgs ? import <nixpkgs> { }
+, lib ? pkgs.lib
+,
+}:
+
+pkgs.python3Packages.buildPythonPackage rec {
+  pname = "smtprd-ng";
+  version = "git";
+  pyproject = true;
+
+  src = lib.cleanSource ./.;
+
+  build-system = [ pkgs.python3Packages.setuptools ];
+
+  dependencies = with pkgs.python3Packages; [
+    aiosmtpd
+    aiosmtplib
+    m2crypto
+    cryptography
+  ];
+
+  pythonImportsCheck = [ "smtprd_ng" ];
+
+  meta = {
+    description = "SMTP forwarding relay daemon with signing and encryption";
+    homepage = "https://app.radicle.xyz/nodes/seed.radicle.garden/rad:z3gWc1qgaeZaoGwL4WTstLNoqjayM";
+    license = lib.licenses.agpl3Only;
+    maintainers = [ lib.maintainers.gador ];
+  };
+
+}

flake.lock

@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1720087678,
+        "narHash": "sha256-uOhYJU3ldDKXYV+mFaXcPtyjq/UIMh/6SCuoVNU9rxM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1afc5440469f94e7ed26e8648820971b102afdc3",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixpkgs-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,42 @@
+{
+  description = "SMTP forwarding relay daemon with signing and encryption";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , flake-utils
+    ,
+    }:
+    let
+      supportedSystems = [
+        "x86_64-linux"
+        "aarch64-darwin"
+      ];
+    in
+    {
+      overlays.default = import ./overlay.nix { inherit self; };
+    }
+    // flake-utils.lib.eachSystem supportedSystems (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        packages = {
+          smtprd-ng = pkgs.callPackage ./. { };
+        };
+
+        packages.default = self.packages.${system}.smtprd-ng;
+
+        apps.default = {
+          type = "app";
+          program = "${self.packages.${system}.smtprd-ng}/bin/smtprd-ng";
+        };
+      }
+    );
+}

overlay.nix

@@ -0,0 +1,4 @@
+{ self }:
+_final: prev: {
+  smtprd-ng = self.packages.${prev.system}.smtprd-ng;
+}