Add config validation endpoint: /config/validate

pages/api/config/validate.ts

@@ -0,0 +1,33 @@
+import type { NextApiRequest, NextApiResponse } from "next";
+
+const handler = async (req: NextApiRequest, res: Response) => {
+  if (req.method !== "POST") {
+    res.status(405).send({ message: "Only POST method allowed" });
+    return;
+  }
+
+  const shade = req.body.shade;
+  const validShades = ["red", "green", "blue"];
+  if (shade == null || validShades.includes(shade)) {
+    res.status(200).json({ message: "OK" });
+    return;
+  }
+
+  res.status(422).json({
+    message: `Shade cannot be ${shade}`,
+    details: {
+      shade: {
+        message: `Shade cannot be ${shade}`,
+      },
+    },
+  });
+};
+
+type Response = NextApiResponse<{
+  message: string;
+  details?: {
+    [key: string]: { message: string };
+  };
+}>;
+
+export default handler;