feat: try rework

validation/service/kiwix.nix

@@ -0,0 +1,36 @@
+let
+  common = import ./common.nix;
+in
+rec {
+  getKiwix = serviceData:
+    let
+      kiwix =
+        if serviceData ? kiwix then
+          common.ensureAttrset "config/services.nix kiwix" serviceData.kiwix
+        else
+          throw "config/services.nix must define kiwix attrset.";
+
+      rootDir =
+        if kiwix ? root_dir then
+          common.ensureNonEmptyString "config/services.nix kiwix.root_dir" kiwix.root_dir
+        else
+          throw "config/services.nix kiwix.root_dir must exist.";
+
+      webPort =
+        if kiwix ? port then
+          common.ensureInt "config/services.nix kiwix.port" kiwix.port
+        else
+          throw "config/services.nix kiwix.port must exist.";
+
+      zimUrls =
+        if kiwix ? urls then
+          common.ensureList "config/services.nix kiwix.urls" kiwix.urls
+        else
+          throw "config/services.nix kiwix.urls must exist.";
+    in
+      {
+        root_dir = rootDir;
+        port = webPort;
+        urls = zimUrls;
+      };
+}