add cache to auth

src/utils/cache.ts

@@ -0,0 +1,19 @@
+import { LRUCache } from "lru-cache";
+import { AuthenticatedUser } from "../auth";
+
+const sessionCache = new LRUCache<string, AuthenticatedUser>({
+  max: 100,
+  ttl: 1000 * 60 * 60,
+});
+
+export function cacheSession(key: string, user: AuthenticatedUser) {
+  sessionCache.set(key, user);
+}
+
+export function getCachedSession(key: string) {
+  return sessionCache.get(key);
+}
+
+export function removeCachedSession(key: string) {
+  sessionCache.delete(key);
+}