Rate Limiting in Middleware

src/middleware.ts

@@ -1,23 +1,53 @@
 import { authMiddleware, redirectToSignIn } from "@clerk/nextjs";
 import { validateRequest } from "./server/unkey";
 import { NextResponse } from "next/server";
+import { Ratelimit } from "@upstash/ratelimit";
+import { Redis } from "@upstash/redis";
+import { env } from "./env.mjs";
+
+const rateLimit = new Ratelimit({
+  redis: Redis.fromEnv(),
+  limiter: Ratelimit.slidingWindow(
+    Number(env.UPSTASH_RATELIMIT_REQUESTS),
+    `${Number(env.UPSTASH_RATELIMIT_SECONDS)}s`
+  ),
+  analytics: true,
+});
 
 export default authMiddleware({
   publicRoutes: ["/", "/api/public/(.*)"],
   afterAuth: async (auth, req) => {
     if (!auth.userId && auth.isPublicRoute) {
+      const { success } = await rateLimit.limit(req.ip || "");
+      if (success) {
+        console.log(success);
         return NextResponse.next();
       }
+      return new NextResponse("TOO MANY REQUESTS", {
+        status: 429,
+        statusText: "Too many requests!",
+      });
+    }
 
     if (
       req.nextUrl.pathname.includes("/api/webhooks") ||
       req.nextUrl.pathname.includes("/api/private")
     ) {
+      const { success } = await rateLimit.limit(req.ip || "");
+
       const isValid = await validateRequest(req);
-      if (isValid) {
+      if (isValid && success) {
         return NextResponse.next();
-      } else {
-        return new NextResponse("UNAUTHORIZED", { status: 403 });
+      } else if (!success) {
+        return new NextResponse("TOO MANY REQUESTS", {
+          status: 429,
+          statusText: "Too many requests!",
+        });
+      } else if (!isValid) {
+        return new NextResponse("UNAUTHORIZED", {
+          status: 403,
+          statusText: "Unauthorized!",
+        });
       }
     }
     if (!auth.userId && !auth.isPublicRoute) {