chore: adds maintenance mode for API v1 (#14555)

* Create middleware.ts

* Update middleware.ts

* Update middleware.ts

---------

Co-authored-by: Keith Williams <keithwillcode@gmail.com>

apps/api/v1/middleware.ts

@@ -0,0 +1,22 @@
+import { get } from "@vercel/edge-config";
+import { NextResponse } from "next/server";
+
+const safeGet = async <T = unknown>(key: string): Promise<T | undefined> => {
+  try {
+    return get<T>(key);
+  } catch (error) {
+    // Don't crash if EDGE_CONFIG env var is missing
+  }
+};
+
+export const config = { matcher: "/:path*" };
+
+export async function middleware() {
+  const isInMaintenanceMode = await safeGet<boolean>("isInMaintenanceMode");
+  if (!isInMaintenanceMode) return NextResponse.next();
+  // If is in maintenance mode, return a 503 status code
+  return NextResponse.json(
+    { message: "API is currently under maintenance. Please try again at a later time." },
+    { status: 503 }
+  );
+}