import { describe, it, expect } from 'vitest';
import { timingSafeStrEqual } from '../../lib/auth/safe_compare.js';

// The owner bearer token is compared on every request. A naive === leaks
// length+prefix via timing; a naive crypto.timingSafeEqual THROWS when the two
// buffers differ in length. timingSafeStrEqual must be constant-time for equal
// lengths and return false (never throw) for mismatched lengths or bad input.

describe('timingSafeStrEqual', () => {
  it('returns true for identical strings', () => {
    expect(timingSafeStrEqual('vk_secrettoken', 'vk_secrettoken')).toBe(true);
  });

  it('returns false for same-length but different strings', () => {
    expect(timingSafeStrEqual('aaaaaa', 'aaaaab')).toBe(false);
  });

  it('returns false (no throw) for different-length strings', () => {
    expect(timingSafeStrEqual('short', 'a-much-longer-token')).toBe(false);
  });

  it('returns false for null / undefined / empty input', () => {
    expect(timingSafeStrEqual(undefined, 'x')).toBe(false);
    expect(timingSafeStrEqual('x', undefined)).toBe(false);
    expect(timingSafeStrEqual('', '')).toBe(false);
    expect(timingSafeStrEqual(null, null)).toBe(false);
  });
});