fix(nixos): validate route protocol fields

configs/nixos/registry/route.nix

@@ -1,49 +1,4 @@
 { lib, util, ... }:
-let
-  # NOLINT(let_order)
-  routeType =
-    protocols: options:
-    lib.types.submodule {
-      options = {
-        domain = lib.mkOption {
-          type = lib.types.str;
-          example = "files.alexion.dev";
-          description = "Public domain for this route.";
-        };
-
-        protocol = lib.mkOption {
-          type = lib.types.enum protocols;
-          description = "Public protocol for this route.";
-        };
-      }
-      // options;
-    };
-
-  webRoute =
-    routeType
-      [
-        "http"
-        "https"
-      ]
-      {
-        port = lib.mkOption {
-          type = lib.types.port;
-          example = 3923;
-          description = "HTTP backend port for this route.";
-        };
-      };
-
-  udpRoute = routeType [ "udp" ] {
-    ports = lib.mkOption {
-      type = lib.types.nonEmptyListOf lib.types.port;
-      example = [
-        2456
-        2457
-      ];
-      description = "UDP ports for this route.";
-    };
-  };
-in
 {
   checks = [
     {
@@ -54,16 +9,69 @@ in
       assertion =
         entries:
         util.registry.predicates.uniqueValue (entry: entry.value) (
-          lib.concatMap (entry: map (port: entry // { value = port; }) entry.value.ports) (
-            lib.filter (entry: entry.value.protocol == "udp") entries
-          )
+          lib.concatMap (entry: map (port: entry // { value = port; }) entry.value.ports) entries
         );
       message = "Route UDP ports must be unique.";
     }
+    {
+      assertion =
+        entries:
+        lib.all (
+          entry:
+          let
+            route = entry.value;
+          in
+          !lib.elem route.protocol [
+            "http"
+            "https"
+          ]
+          || (route.port != null && route.ports == [ ])
+        ) entries;
+      message = "HTTP and HTTPS routes must set port and not ports.";
+    }
+    {
+      assertion =
+        entries:
+        lib.all (
+          entry: entry.value.protocol != "udp" || (entry.value.port == null && entry.value.ports != [ ])
+        ) entries;
+      message = "UDP routes must set ports and not port.";
+    }
   ];
 
-  type = lib.types.oneOf [
-    webRoute
-    udpRoute
-  ];
+  type = lib.types.submodule {
+    options = {
+      domain = lib.mkOption {
+        type = lib.types.str;
+        example = "files.alexion.dev";
+        description = "Public domain for this route.";
+      };
+
+      protocol = lib.mkOption {
+        type = lib.types.enum [
+          "http"
+          "https"
+          "udp"
+        ];
+        description = "Public protocol for this route.";
+      };
+
+      port = lib.mkOption {
+        type = lib.types.nullOr lib.types.port;
+        default = null;
+        example = 3923;
+        description = "HTTP backend port for an HTTP or HTTPS route.";
+      };
+
+      ports = lib.mkOption {
+        type = lib.types.listOf lib.types.port;
+        default = [ ];
+        example = [
+          2456
+          2457
+        ];
+        description = "UDP ports for a UDP route.";
+      };
+    };
+  };
 }