Add NixOS module

flake.nix

@@ -0,0 +1,152 @@
+{
+  description = "The Heart of YouCube. See the documentation at https://youcube.madefor.cc.";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils, }:
+    utils.lib.eachSystem [
+      "x86_64-linux"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ]
+      (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          version = builtins.substring 0 8 self.lastModifiedDate;
+          deps = with pkgs.python3Packages; [
+            sanic
+            yt-dlp
+            ujson
+            spotipy
+          ];
+        in
+        {
+          packages = {
+            default = pkgs.python3Packages.buildPythonApplication {
+              pname = "youcube";
+              inherit version;
+              src = ./.;
+              format = "pyproject";
+              patchPhase = "rm src/requirements.txt";
+              buildInputs = [ pkgs.python3Packages.setuptools ];
+              nativeBuildInputs = [ pkgs.makeWrapper ];
+              propagatedBuildInputs = deps;
+              pythonImportsCheck = [ "youcube" ];
+              postInstall = ''
+                mkdir -p $out/bin
+                makeWrapper ${pkgs.python3}/bin/python3 $out/bin/youcube-server \
+                  --add-flags "$out/lib/${pkgs.python3.libPrefix}/site-packages/youcube/__main__.py" \
+                  --set PYTHONPATH "${pkgs.python3.pkgs.makePythonPath deps}" \
+                  --set PATH "${pkgs.lib.makeBinPath [ pkgs.sanjuuni pkgs.ffmpeg ]}"
+              '';
+            };
+
+            docker =
+              let server = self.packages.${system}.default;
+              in pkgs.dockerTools.buildLayeredImage {
+                name = server.pname;
+                tag = server.version;
+                contents = [ server pkgs.sanjuuni pkgs.ffmpeg ] ++ self.packages.${system}.default.propagatedBuildInputs;
+
+                config = {
+                  Cmd =
+                    let pkg = self.packages.${system}.default;
+                    in [ "${pkg}/bin/youcube-server" ];
+                  WorkingDir = "/";
+                };
+              };
+          };
+
+          defaultApp = utils.lib.mkApp { drv = self.packages.${system}.default; };
+
+          devShells.default = pkgs.mkShell {
+            packages = with pkgs; [ python3 python3Packages.pip sanjuuni ffmpeg ];
+          };
+
+        }) // {
+
+      nixosModules.default = { config, lib, pkgs, ... }:
+        with lib;
+        let
+          cfg = config.services.youcube-server;
+        in
+        {
+          options.services.youcube-server = {
+            enable = mkOption {
+              type = types.bool;
+              default = false;
+            };
+            packages = {
+              type = types.submodule;
+              description = lib.mdDoc "Packages used by YouCube";
+              options = {
+                sanjuuni = mkPackageOptionMD pkgs "sanjuuni" { };
+                ffmpeg = mkPackageOptionMD pkgs "ffmpeg" { };
+              };
+            };
+
+            spotify = {
+              type = types.submodule;
+              description = "Spotify support";
+              options = {
+                credentialsFile = mkOption {
+                  type = types.path;
+                  description = lib.mdDoc ''
+                    File containing the SPOTIFY_CLIENT_ID and
+                    SPOTIFY_CLIENT_SECRET in the format of
+                    an EnvironmentFile=, as described by systemd.exec(5).
+                  '';
+                  example = "/etc/nixos/youcube-spotify-credentials";
+                  default = null;
+                };
+              };
+            };
+
+            host = mkOption {
+              description = lib.mdDoc "The host of the YouCube server.";
+              default = "0.0.0.0";
+              type = types.string;
+            };
+
+            port = mkOption {
+              description = lib.mdDoc "YouCube server port.";
+              default = 5000;
+              type = types.port;
+            };
+          };
+
+          config = mkIf cfg.enable {
+            systemd.services."youcube.youcube-server" = {
+              wantedBy = [ "multi-user.target" ];
+              after = [ "network.target" ];
+              serviceConfig =
+                let
+                  pkg = self.packages.${system}.default;
+                in
+                {
+                  Restart = "on-failure";
+                  ExecStart = "python3 ${pkg}/${pkgs.python3.sitePackages}/youcube/__main__.py";
+                  DynamicUser = "yes";
+                  RuntimeDirectory = "youcube.youcube-server";
+                  RuntimeDirectoryMode = "0755";
+                  StateDirectory = "youcube.youcube-server";
+                  StateDirectoryMode = "0700";
+                  CacheDirectory = "youcube.youcube-server";
+                  CacheDirectoryMode = "0750";
+                  EnvironmentFile = [ (cfg.spotify.credentialsFile || "/dev/null") ];
+                };
+              environment = {
+                SANJUUNI_PATH = "${cfg.packages.sanjuuni}/bin/sanjuuni";
+                FFMPEG_PATH = "${cfg.packages.ffmpeg}/bin/ffmpeg";
+                HOST = "${cfg.host}";
+                PORT = "${cfg.port}";
+              };
+            };
+          };
+        };
+    };
+}