export const BILL_BODY_LIMIT = 64 * 1024;

export async function readLimited(request: Request, max: number): Promise<string | null> {
  const declared = request.headers.get("content-length");
  if (declared && Number(declared) > max) return null;
  const reader = request.body?.getReader();
  if (!reader) return "";
  let total = 0;
  const decoder = new TextDecoder();
  let text = "";
  while (true) {
    const { done, value } = await reader.read();
    if (done) break;
    if (!value) continue;
    total += value.byteLength;
    if (total > max) {
      await reader.cancel();
      return null;
    }
    text += decoder.decode(value, { stream: true });
  }
  text += decoder.decode();
  return text;
}