nixos/transfer-sh: init

Co-authored-by: Pablo Ovelleiro Corral <mail@pablo.tools>

nixos/modules/module-list.nix

@@ -777,6 +777,7 @@
   ./services/misc/tiddlywiki.nix
   ./services/misc/tp-auto-kbbl.nix
   ./services/misc/tuxclocker.nix
+  ./services/misc/transfer-sh.nix
   ./services/misc/tzupdate.nix
   ./services/misc/uhub.nix
   ./services/misc/weechat.nix

nixos/modules/services/misc/transfer-sh.nix

@@ -0,0 +1,102 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.transfer-sh;
+  inherit (lib)
+    mkDefault mkEnableOption mkPackageOption mkIf mkOption
+    types mapAttrs isBool getExe boolToString mdDoc optionalAttrs;
+in
+{
+  options.services.transfer-sh = {
+    enable = mkEnableOption (mdDoc "Easy and fast file sharing from the command-line");
+
+    package = mkPackageOption pkgs "transfer-sh" { };
+
+    settings = mkOption {
+      type = types.submodule { freeformType = with types; attrsOf (oneOf [ bool int str ]); };
+      default = { };
+      example = {
+        LISTENER = ":8080";
+        BASEDIR = "/var/lib/transfer.sh";
+        TLS_LISTENER_ONLY = false;
+      };
+      description = mdDoc ''
+        Additional configuration for transfer-sh, see
+        <https://github.com/dutchcoders/transfer.sh#usage-1>
+        for supported values.
+
+        For secrets use secretFile option instead.
+      '';
+    };
+
+    provider = mkOption {
+      type = types.enum [ "local" "s3" "storj" "gdrive" ];
+      default = "local";
+      description = mdDoc "Storage providers to use";
+    };
+
+    secretFile = mkOption {
+      type = types.nullOr types.path;
+      default = null;
+      example = "/run/secrets/transfer-sh.env";
+      description = mdDoc ''
+        Path to file containing environment variables.
+        Useful for passing down secrets.
+        Some variables that can be considered secrets are:
+         - AWS_ACCESS_KEY
+         - AWS_ACCESS_KEY
+         - TLS_PRIVATE_KEY
+         - HTTP_AUTH_HTPASSWD
+      '';
+    };
+  };
+
+  config =
+    let
+      localProvider = (cfg.provider == "local");
+      stateDirectory = "/var/lib/transfer.sh";
+    in
+    mkIf cfg.enable
+      {
+        services.transfer-sh.settings = {
+          LISTENER = mkDefault ":8080";
+        } // optionalAttrs localProvider {
+          BASEDIR = mkDefault stateDirectory;
+        };
+
+        systemd.services.transfer-sh = {
+          after = [ "network.target" ];
+          wantedBy = [ "multi-user.target" ];
+          environment = mapAttrs (_: v: if isBool v then boolToString v else toString v) cfg.settings;
+          serviceConfig = {
+            CapabilityBoundingSet = [ "CAP_NET_BIND_SERVICE" ];
+            DevicePolicy = "closed";
+            DynamicUser = true;
+            ExecStart = "${getExe cfg.package} --provider ${cfg.provider}";
+            LockPersonality = true;
+            MemoryDenyWriteExecute = true;
+            PrivateDevices = true;
+            PrivateUsers = true;
+            ProtectClock = true;
+            ProtectControlGroups = true;
+            ProtectHostname = true;
+            ProtectKernelLogs = true;
+            ProtectKernelModules = true;
+            ProtectKernelTunables = true;
+            ProtectProc = "invisible";
+            RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
+            RestrictNamespaces = true;
+            RestrictRealtime = true;
+            SystemCallArchitectures = [ "native" ];
+            SystemCallFilter = [ "@system-service" ];
+            StateDirectory = baseNameOf stateDirectory;
+          } // optionalAttrs (cfg.secretFile != null) {
+            EnvironmentFile = cfg.secretFile;
+          } // optionalAttrs localProvider {
+            ReadWritePaths = cfg.settings.BASEDIR;
+          };
+        };
+      };
+
+  meta.maintainers = with lib.maintainers; [ ocfox ];
+}