Cielo QRCode Parser Rec

gist.js

const barcode = "00020101021226410005Cielo0116123456789012000102082009130352040000530398654120000000001005802BR5905CIELO6014SANTO ANDRE SP801010033”https://www.cielo.com.br/qrcode”011613050329197F190A0212150518113349030410000404000105020006020163049872"

const ID_SIZE = 2
const LENGTH_SIZE = 2
const TRANSACTION_INFO_LENGTH_SIZE = 3

const MERCHANT_ACCOUNT_INFORMATION_ID = '26'
const TRANSACTION_INFORMATION_ID = '80'

const parseQRCode = (barcode, cursor = 0, items = []) => {
  const id = barcode.substr(cursor, ID_SIZE);

  const lengthSizeForId = id === TRANSACTION_INFORMATION_ID ? TRANSACTION_INFO_LENGTH_SIZE : LENGTH_SIZE

  const dataSize = parseInt(barcode.substr(cursor + ID_SIZE, lengthSizeForId));

  if (cursor >= barcode.length) return items

  const nextCursor = cursor + ID_SIZE + lengthSizeForId + dataSize

  if (id === MERCHANT_ACCOUNT_INFORMATION_ID) {
    const partToParse = barcode.slice(cursor + ID_SIZE + lengthSizeForId, nextCursor)

    const merchantInfoItems = parseQRCode(partToParse, 0, [])

    return parseQRCode(
      barcode,
      nextCursor,
      [
        ...items,
        {
          id: id,
          length: dataSize,
          value: merchantInfoItems
        }
      ]
    );
  }

  if (id === TRANSACTION_INFORMATION_ID) {
    const partToParse = barcode.slice(cursor + ID_SIZE + lengthSizeForId, nextCursor)

    const transactionInfoItems = parseQRCode(partToParse, 0, [])
    
    return parseQRCode(
      barcode,
      nextCursor,
      [
        ...items,
        {
          id: id,
          length: dataSize,
          value: transactionInfoItems
        }
      ]
    );
  }

  return parseQRCode(
    barcode,
    nextCursor,
    [
      ...items,
      {
        id: id,
        length: dataSize,
        value: barcode.substr(cursor + ID_SIZE + LENGTH_SIZE, dataSize)
      }
    ]
  );
}

const resultArray = parseQRCode(barcode, 0, [])

console.log(resultArray)