Function assertRateLimit

packages/feedback-worker/src/index.ts:224–246

(
  request: Request,
  env: Env,
  options: { name: string; limit: number; windowSeconds: number },
)

}

async function assertRateLimit(
  request: Request,
  env: Env,
  options: { name: string; limit: number; windowSeconds: number },
): Promise<void> {
  if (!env.FEEDBACK_RATE_LIMIT) {
    throw new HttpError(500, "Rate limit storage is not configured");
  }

  const now = Math.floor(Date.now() / 1000);
  const windowStart = now - (now % options.windowSeconds);
  const clientKey = await getClientKey(request);
  const key = `feedback:${options.name}:${windowStart}:${clientKey}`;
  const current = Number.parseInt((await env.FEEDBACK_RATE_LIMIT.get(key)) ?? "0", 10);

  if (current >= options.limit) {
    throw new HttpError(429, "Too many feedback requests. Please try again later.");
  }

  await env.FEEDBACK_RATE_LIMIT.put(key, String(current + 1), {
    expirationTtl: options.windowSeconds + 300,
  });
}

async function getClientKey(request: Request): Promise<string> {
  const ip =