founders card

src/lib/card-gen/public-rate-limit.ts

@@ -0,0 +1,40 @@
+const WINDOW_MS = 60_000;
+const MAX_CARD_HITS = 60;
+const MAX_SIGNUP_HITS = 10;
+
+const cardHitsByIp = new Map<string, number[]>();
+const signupHitsByIp = new Map<string, number[]>();
+
+function checkLimit(
+  store: Map<string, number[]>,
+  ip: string,
+  maxHits: number,
+): { allowed: true } | { allowed: false; retryAfterSeconds: number } {
+  const now = Date.now();
+  const cutoff = now - WINDOW_MS;
+  const prev = store.get(ip) ?? [];
+  const recent = prev.filter((t) => t > cutoff);
+  if (recent.length >= maxHits) {
+    const retryAfterSeconds = Math.max(
+      1,
+      Math.ceil((recent[0]! + WINDOW_MS - now) / 1000),
+    );
+    store.set(ip, recent);
+    return { allowed: false, retryAfterSeconds };
+  }
+  recent.push(now);
+  store.set(ip, recent);
+  return { allowed: true };
+}
+
+export function checkPublicCardRateLimit(
+  ip: string,
+): { allowed: true } | { allowed: false; retryAfterSeconds: number } {
+  return checkLimit(cardHitsByIp, ip, MAX_CARD_HITS);
+}
+
+export function checkPublicSignupRateLimit(
+  ip: string,
+): { allowed: true } | { allowed: false; retryAfterSeconds: number } {
+  return checkLimit(signupHitsByIp, ip, MAX_SIGNUP_HITS);
+}