export function bufferToBase64url(buffer: ArrayBuffer): string {
  const bytes = new Uint8Array(buffer);
  let binary = "";
  bytes.forEach((b) => (binary += String.fromCharCode(b)));
  return btoa(binary)
    .replace(/\+/g, "-")
    .replace(/\//g, "_")
    .replace(/=+$/, "");
}

export function base64urlToBuffer(baseurl64: string): ArrayBuffer {
  const padding = "=".repeat((4 - (baseurl64.length % 4)) % 4);
  const base64 = (baseurl64 + padding).replace(/\-/g, "+").replace(/_/g, "/");
  const rawData = atob(base64);
  const outputArray = new Uint8Array(rawData.length);
  for (let i = 0; i < rawData.length; ++i) {
    outputArray[i] = rawData.charCodeAt(i);
  }
  return outputArray.buffer;
}