Function fetchFile

packages/unpkg-worker/src/lib/npm-files.ts:20–53

(
  context: ExecutionContext,
  origin: string,
  packageName: string,
  version: string,
  filename: string
)

}

export async function fetchFile(
  context: ExecutionContext,
  origin: string,
  packageName: string,
  version: string,
  filename: string
): Promise<Response | null> {
  if (filename === "" || filename === "/") {
    return null;
  }

  let url = new URL(`/file/${packageName.toLowerCase()}@${version}${filename}`, origin);
  let request = new Request(url);

  let cache = await caches.open("npm-files");
  let response = await cache.match(request);
  if (!response) {
    response = await fetch(request);

    if (response.ok) {
      context.waitUntil(cache.put(request, createCacheableResponse(response)));
    }
  }

  if (!response.ok) {
    if (response.status === 404) {
      return null;
    }

    throw new Error(`Failed to fetch file: ${response.status} ${response.statusText}`);
  }

  return response;
}

export async function getFile(
  context: ExecutionContext,