calendar/packages/lib/checkRateLimitAndThrowError.ts

import { TRPCError } from "@calcom/trpc/server";

import type { RateLimitHelper } from "./rateLimit";
import { rateLimiter } from "./rateLimit";

export async function checkRateLimitAndThrowError({
  rateLimitingType = "core",
  identifier,
  onRateLimiterResponse,
  opts,
}: RateLimitHelper) {
  const response = await rateLimiter()({ rateLimitingType, identifier, opts });
  const { remaining, reset } = response;

  if (onRateLimiterResponse) onRateLimiterResponse(response);

  if (remaining < 1) {
    const convertToSeconds = (ms: number) => Math.floor(ms / 1000);
    const secondsToWait = convertToSeconds(reset - Date.now());
    throw new TRPCError({
      code: "TOO_MANY_REQUESTS",
      message: `Rate limit exceeded. Try again in ${secondsToWait} seconds.`,
    });
  }
}