fix: prevent negative wait time in rate limit error message (calcom#28765)

Co-authored-by: Romit <85230081+romitg2@users.noreply.github.com>

Author: Akash504-ai

packages/lib/checkRateLimitAndThrowError.test.ts

@@ -67,4 +67,21 @@ describe("checkRateLimitAndThrowError", () => {
 
     await expect(checkRateLimitAndThrowError({ rateLimitingType, identifier })).resolves.not.toThrow();
   });
+  it("should not return negative wait time when reset is in the past", async () => {
+    vi.mocked(rateLimiter).mockReturnValue(() => {
+      return {
+        limit: 10,
+        remaining: -1,
+        reset: Date.now() - 5000, // past time
+        success: false,
+      } as RatelimitResponse;
+    });
+
+    const identifier = "test-identifier";
+    const rateLimitingType = "core";
+
+    await expect(
+      checkRateLimitAndThrowError({ rateLimitingType, identifier })
+    ).rejects.toThrow("0 seconds");
+  });
 });

packages/lib/checkRateLimitAndThrowError.ts

@@ -13,7 +13,7 @@ export async function checkRateLimitAndThrowError({
   const { success, reset } = response;
   if (!success) {
     const convertToSeconds = (ms: number) => Math.floor(ms / 1000);
-    const secondsToWait = convertToSeconds(reset - Date.now());
+    const secondsToWait = Math.max(0, convertToSeconds(reset - Date.now()));
     throw new HttpError({
       statusCode: 429,
       message: `Rate limit exceeded. Try again in ${secondsToWait} seconds.`,