Function getBuildIntegrity

packages/unpkg-esm/src/request-handler.ts:281–321

(
  env: Env,
  origin: string,
  packageName: string,
  version: string,
  filename: string | undefined,
  searchParams: URLSearchParams
)

}

async function getBuildIntegrity(
  env: Env,
  origin: string,
  packageName: string,
  version: string,
  filename: string | undefined,
  searchParams: URLSearchParams
): Promise<{ response: Response } | { value: string | null }> {
  if (searchParams.has("raw")) {
    return { value: null };
  }

  let buildSearchParams = new URLSearchParams(searchParams);
  buildSearchParams.set("origin", origin);
  let response: Response;
  try {
    response = await fetch(
      new URL(`/build/${packageName}@${version}${filename ?? ""}${normalizeSearch(buildSearchParams)}`, env.FILES_ORIGIN)
    );
  } catch {
    return { value: null };
  }

  if (!response.ok) {
    if (response.status === 404) {
      return {
        response: jsonError({
          code: "BUILD_NOT_FOUND",
          message: await response.text(),
          status: 404,
        }),
      };
    }

    return { value: null };
  }

  let bytes = await response.arrayBuffer();
  let digest = await crypto.subtle.digest("SHA-384", bytes);
  return { value: `sha384-${base64Encode(new Uint8Array(digest))}` };
}

async function serveRawFile(env: Env, packageName: string, version: string, filename: string): Promise<Response> {
  let rawResponse = await fetch(new URL(`/file/${packageName}@${version}${filename}`, env.FILES_ORIGIN));