Add notification savings + webhook validation

src/lib/kv.ts

@@ -0,0 +1,32 @@
+import { FrameNotificationDetails } from "@farcaster/frame-sdk";
+import { Redis } from "@upstash/redis";
+
+const redis = new Redis({
+  url: process.env.KV_REST_API_URL,
+  token: process.env.KV_REST_API_TOKEN,
+});
+
+function getUserNotificationDetailsKey(fid: number): string {
+  return `frames-v2-demo:user:${fid}`;
+}
+
+export async function getUserNotificationDetails(
+  fid: number
+): Promise<FrameNotificationDetails | null> {
+  return await redis.get<FrameNotificationDetails>(
+    getUserNotificationDetailsKey(fid)
+  );
+}
+
+export async function setUserNotificationDetails(
+  fid: number,
+  notificationDetails: FrameNotificationDetails
+): Promise<void> {
+  await redis.set(getUserNotificationDetailsKey(fid), notificationDetails);
+}
+
+export async function deleteUserNotificationDetails(
+  fid: number
+): Promise<void> {
+  await redis.del(getUserNotificationDetailsKey(fid));
+}