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