Function assertRedirectWithDubIdCookie

apps/web/tests/redirects/index.test.ts:16–60

(
  baseUrl: string,
  linkKey: string,
  options?: { via?: string },
)

// Redirect includes ?dub_id=… and sets a matching dub_id_*_<linkKey> cookie whose value equals the query dub_id
async function assertRedirectWithDubIdCookie(
  baseUrl: string,
  linkKey: string,
  options?: { via?: string },
) {
  const response = await fetch(`${baseUrl}/${linkKey}`, fetchOptions);

  const location = response.headers.get("location");
  expect(location).toBeTruthy();
  const redirectUrl = new URL(location!, baseUrl);
  const dubIdFromQuery = redirectUrl.searchParams.get("dub_id");
  expect(dubIdFromQuery).toBeTruthy();
  expect(dubIdFromQuery).toMatch(/^[a-zA-Z0-9_-]+$/);

  if (options?.via != null) {
    expect(redirectUrl.searchParams.get("via")).toBe(options.via);
  }

  expect(response.headers.get("x-powered-by")).toBe(poweredBy);
  expect(response.status).toBe(302);

  const setCookie = response.headers.getSetCookie?.() ?? [];
  const dubIdCookie = setCookie.find((line) => {
    const name = line.split(";")[0]!.split("=")[0]!.trim();
    return name.startsWith("dub_id_") && name.endsWith(`_${linkKey}`);
  });
  expect(
    dubIdCookie,
    "expected Set-Cookie from createResponseWithCookies (dub_id_<domain>_<key>)",
  ).toBeDefined();

  const pair = dubIdCookie!.split(";")[0]!;
  const eq = pair.indexOf("=");
  const cookieValue = pair.slice(eq + 1);
  expect(cookieValue).toBe(dubIdFromQuery);

  const pathAttr = `/${encodeURI(linkKey)}`;
  expect(dubIdCookie).toMatch(
    new RegExp(
      `Path=${pathAttr.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")}(?:;|$)`,
      "i",
    ),
  );
  expect(dubIdCookie).toMatch(/Max-Age=3600\b/i);
}

describe.runIf(env.CI)("Link Redirects", async () => {
  const h = new IntegrationHarness();