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EXTRACT FUNCTION FOR PARSING BLINDED PAYMENT CODE FROM A TRANSACTION

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This commit is contained in:
julian 2023-01-31 14:40:54 -06:00
parent 95d1f3c17e
commit 6a0673bec5
2 changed files with 30 additions and 15 deletions
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18
lib/services/mixins/paynym_wallet_interface.dart
View file

@ -16,6 +16,7 @@ import 'package:stackwallet/exceptions/wallet/insufficient_balance_exception.dar
import 'package:stackwallet/exceptions/wallet/paynym_send_exception.dart';
import 'package:stackwallet/models/isar/models/isar_models.dart';
import 'package:stackwallet/utilities/bip32_utils.dart';
import 'package:stackwallet/utilities/bip47_utils.dart';
import 'package:stackwallet/utilities/enums/coin_enum.dart';
import 'package:stackwallet/utilities/enums/derive_path_type_enum.dart';
import 'package:stackwallet/utilities/flutter_secure_storage_interface.dart';
@ -696,21 +697,8 @@ mixin PaynymWalletInterface {
}
try {
Uint8List? blindedCodeBytes;
for (int i = 0; i < transaction.outputs.length; i++) {
List<String>? scriptChunks =
transaction.outputs.elementAt(1).scriptPubKeyAsm?.split(" ");
if (scriptChunks?.length == 2 && scriptChunks?[0] == "OP_RETURN") {
final blindedPaymentCode = scriptChunks![1];
final bytes = blindedPaymentCode.fromHex;
// https://en.bitcoin.it/wiki/BIP_0047#Sending
if (bytes.length == 80 && bytes.first == 1) {
blindedCodeBytes = bytes;
}
}
}
final blindedCodeBytes =
Bip47Utils.getBlindedPaymentCodeBytesFrom(transaction);
// transaction does not contain a payment code
if (blindedCodeBytes == null) {

27
lib/utilities/bip47_utils.dart Normal file
View file

@ -0,0 +1,27 @@
import 'dart:typed_data';
import 'package:bip47/src/util.dart';
import 'package:stackwallet/models/isar/models/blockchain_data/transaction.dart';
abstract class Bip47Utils {
/// looks at tx outputs and returns a blinded payment code if found
static Uint8List? getBlindedPaymentCodeBytesFrom(Transaction transaction) {
Uint8List? blindedCodeBytes;
for (int i = 0; i < transaction.outputs.length; i++) {
List<String>? scriptChunks =
transaction.outputs.elementAt(i).scriptPubKeyAsm?.split(" ");
if (scriptChunks?.length == 2 && scriptChunks?[0] == "OP_RETURN") {
final blindedPaymentCode = scriptChunks![1];
final bytes = blindedPaymentCode.fromHex;
// https://en.bitcoin.it/wiki/BIP_0047#Sending
if (bytes.length == 80 && bytes.first == 1) {
blindedCodeBytes = bytes;
}
}
}
return blindedCodeBytes;
}
}