fromFriendlyAddress static method

DecodeAddressResult fromFriendlyAddress(String address)

Implementation

static DecodeAddressResult fromFriendlyAddress(String address) {
  final data = StringUtils.encode(address, type: StringEncoding.base64);
  // 1 byte tag + 1 byte workchain + 32 bytes hash + 2 byte crc
  if (data.length != _TonAddressConst.friendlyAddressBytesLength) {
    throw AddressConverterException.addressValidationFailed(
      reason: "Invalid address bytes.",
      details: {"length": data.length},
    );
  }

  // Prepare data
  final addr = data.sublist(0, 34);
  final crc = data.sublist(34, 36);
  final calcedCrc = Crc16.quickIntDigest(addr);
  if (!BytesUtils.bytesEqual(crc, calcedCrc)) {
    throw AddressConverterException.addressValidationFailed(
      reason: "Invalid checksum.",
      details: {"expected": calcedCrc, "checksum": crc},
    );
  }
  final List<FriendlyAddressFlags> flags = [];
  // Parse tag
  int tag = addr[0];
  if ((tag & FriendlyAddressFlags.test.flag) != 0) {
    flags.add(FriendlyAddressFlags.test);
    tag ^= FriendlyAddressFlags.test.flag;
  }
  if (tag != FriendlyAddressFlags.bounceable.flag &&
      tag != FriendlyAddressFlags.nonBounceable.flag) {
    throw AddressConverterException.addressValidationFailed(
      reason: "Invalid checksum.",
      details: {"tag": tag},
    );
  }
  if (tag == FriendlyAddressFlags.bounceable.flag) {
    flags.add(FriendlyAddressFlags.bounceable);
  } else {
    flags.add(FriendlyAddressFlags.nonBounceable);
  }
  int? workchain;
  if (addr[1] == BinaryOps.mask8) {
    workchain = -1;
  } else {
    workchain = addr[1];
  }
  final hashPart = addr.sublist(2, 34);
  return DecodeAddressResult(
    workchain: workchain,
    hash: hashPart,
    flags: flags,
  );
}