function randomChoiceFromIndexable()

in src/lambda-edge/check-auth/index.ts [191:203]

• 13 lines of code
• 3 McCabe index (conditional complexity)

function randomChoiceFromIndexable(indexable: string) {
  if (indexable.length > 256) {
    throw new Error(`indexable is too large: ${indexable.length}`);
  }
  const chunks = Math.floor(256 / indexable.length);
  const firstBiassedIndex = indexable.length * chunks;
  let randomNumber: number;
  do {
    randomNumber = randomBytes(1)[0];
  } while (randomNumber >= firstBiassedIndex);
  const index = randomNumber % indexable.length;
  return indexable[index];
}