Merge pull request dart-bitcoin#25 from SFzxc/feature/add_support_seg…

…wit_tx

[WIP] Add support segwit tx builder 80%

lib/src/classify.dart

@@ -0,0 +1,40 @@
+import 'dart:typed_data';
+import '../src/utils/script.dart' as bscript;
+import 'templates/pubkeyhash.dart' as pubkeyhash;
+import 'templates/pubkey.dart' as pubkey;
+import 'templates/witnesspubkeyhash.dart' as witnessPubKeyHash;
+
+const SCRIPT_TYPES = {
+  'P2SM': 'multisig',
+  'NONSTANDARD': 'nonstandard',
+  'NULLDATA': 'nulldata',
+  'P2PK': 'pubkey',
+  'P2PKH': 'pubkeyhash',
+  'P2SH': 'scripthash',
+  'P2WPKH': 'witnesspubkeyhash',
+  'P2WSH': 'witnessscripthash',
+  'WITNESS_COMMITMENT': 'witnesscommitment'
+};
+
+String classifyOutput(Uint8List script) {
+  if (witnessPubKeyHash.outputCheck(script)) return SCRIPT_TYPES['P2WPKH'];
+  if (pubkeyhash.outputCheck(script)) return SCRIPT_TYPES['P2PKH'];
+  final chunks = bscript.decompile(script);
+  if (chunks == null) throw new ArgumentError('Invalid script');
+  return SCRIPT_TYPES['NONSTANDARD'];
+}
+
+String classifyInput(Uint8List script) {
+  final chunks = bscript.decompile(script);
+  if (chunks == null) throw new ArgumentError('Invalid script');
+  if (pubkeyhash.inputCheck(chunks)) return SCRIPT_TYPES['P2PKH'];
+  if (pubkey.inputCheck(chunks)) return SCRIPT_TYPES['P2PK'];
+  return SCRIPT_TYPES['NONSTANDARD'];
+}
+
+String classifyWitness(List<Uint8List> script) {
+  final chunks = bscript.decompile(script);
+  if (chunks == null) throw new ArgumentError('Invalid script');
+  if (witnessPubKeyHash.inputCheck(chunks)) return SCRIPT_TYPES['P2WPKH'];
+  return SCRIPT_TYPES['NONSTANDARD'];
+}

lib/src/payments/p2pk.dart

@@ -0,0 +1,32 @@
+import 'dart:typed_data';
+import 'package:meta/meta.dart';
+import 'package:bip32/src/utils/ecurve.dart' show isPoint;
+import 'package:bs58check/bs58check.dart' as bs58check;
+
+import '../crypto.dart';
+import '../models/networks.dart';
+import '../payments/index.dart' show PaymentData;
+import '../utils/script.dart' as bscript;
+import '../utils/constants/op.dart';
+
+class P2PK {
+  PaymentData data;
+  NetworkType network;
+  P2PK({@required data, network}) {
+    this.network = network ?? bitcoin;
+    this.data = data;
+    _init();
+  }
+
+  _init() {
+    if (data.output != null) {
+      if (data.output[data.output.length - 1] != OPS['OP_CHECKSIG'])
+        throw new ArgumentError('Output is invalid');
+      if (!isPoint(data.output.sublist(1, -1)))
+        throw new ArgumentError('Output pubkey is invalid');
+    }
+    if (data.input != null) {
+      // TODO
+    }
+  }
+}

lib/src/templates/pubkey.dart

@@ -0,0 +1,21 @@
+import 'dart:typed_data';
+import '../utils/script.dart' as bscript;
+import '../utils/constants/op.dart';
+
+bool inputCheck(List<dynamic> chunks) {
+  return chunks.length == 1 && bscript.isCanonicalScriptSignature(chunks[0]);
+  // return chunks != null &&
+  //     chunks.length == 2 &&
+  //     bscript.isCanonicalScriptSignature(chunks[0]) &&
+  //     bscript.isCanonicalPubKey(chunks[1]);
+}
+
+// bool outputCheck(Uint8List script) {
+//   final buffer = bscript.compile(script);
+//   return buffer.length == 25 &&
+//       buffer[0] == OPS['OP_DUP'] &&
+//       buffer[1] == OPS['OP_HASH160'] &&
+//       buffer[2] == 0x14 &&
+//       buffer[23] == OPS['OP_EQUALVERIFY'] &&
+//       buffer[24] == OPS['OP_CHECKSIG'];
+// }

lib/src/templates/pubkeyhash.dart

@@ -0,0 +1,20 @@
+import 'dart:typed_data';
+import '../utils/script.dart' as bscript;
+import '../utils/constants/op.dart';
+
+bool inputCheck(List<dynamic> chunks) {
+  return chunks != null &&
+      chunks.length == 2 &&
+      bscript.isCanonicalScriptSignature(chunks[0]) &&
+      bscript.isCanonicalPubKey(chunks[1]);
+}
+
+bool outputCheck(Uint8List script) {
+  final buffer = bscript.compile(script);
+  return buffer.length == 25 &&
+      buffer[0] == OPS['OP_DUP'] &&
+      buffer[1] == OPS['OP_HASH160'] &&
+      buffer[2] == 0x14 &&
+      buffer[23] == OPS['OP_EQUALVERIFY'] &&
+      buffer[24] == OPS['OP_CHECKSIG'];
+}

lib/src/templates/witnesspubkeyhash.dart

@@ -0,0 +1,17 @@
+import 'dart:typed_data';
+import '../utils/script.dart' as bscript;
+import '../utils/constants/op.dart';
+
+bool inputCheck(List<dynamic> chunks) {
+  return chunks != null &&
+      chunks.length == 2 &&
+      bscript.isCanonicalScriptSignature(chunks[0]) &&
+      bscript.isCanonicalPubKey(chunks[1]);
+}
+
+bool outputCheck(Uint8List script) {
+  final buffer = bscript.compile(script);
+  return buffer.length == 22 &&
+      buffer[0] == OPS['OP_0'] &&
+      buffer[1] == 0x14;
+}