Bip39 minor enhancements (#1416)

* minor enhancements

* rename bitcoin_derivations -> electrum_derivations

cw_bitcoin/lib/electrum_derivations.dart

@@ -1,6 +1,6 @@
 import 'package:cw_core/wallet_info.dart';
 
-Map<DerivationType, List<DerivationInfo>> bitcoin_derivations = {
+Map<DerivationType, List<DerivationInfo>> electrum_derivations = {
   DerivationType.electrum: [
     DerivationInfo(
       derivationType: DerivationType.electrum,

lib/bitcoin/cw_bitcoin.dart

@@ -287,6 +287,18 @@ class CWBitcoin extends Bitcoin {
   }) async {
     List<DerivationInfo> list = [];
 
+    List<DerivationType> types = await compareDerivationMethods(mnemonic: mnemonic, node: node);
+    if (types.length == 1 && types.first == DerivationType.electrum) {
+      return [
+        DerivationInfo(
+          derivationType: DerivationType.electrum,
+          derivationPath: "m/0'/0",
+          description: "Electrum",
+          scriptType: "p2wpkh",
+        )
+      ];
+    }
+
     final electrumClient = ElectrumClient();
     await electrumClient.connectToUri(node.uri);
 
@@ -304,7 +316,7 @@ class CWBitcoin extends Bitcoin {
         break;
     }
 
-    for (DerivationType dType in bitcoin_derivations.keys) {
+    for (DerivationType dType in electrum_derivations.keys) {
       late Uint8List seedBytes;
       if (dType == DerivationType.electrum) {
         seedBytes = await mnemonicToSeedBytes(mnemonic);
@@ -312,7 +324,7 @@ class CWBitcoin extends Bitcoin {
         seedBytes = bip39.mnemonicToSeed(mnemonic, passphrase: passphrase ?? '');
       }
 
-      for (DerivationInfo dInfo in bitcoin_derivations[dType]!) {
+      for (DerivationInfo dInfo in electrum_derivations[dType]!) {
         try {
           DerivationInfo dInfoCopy = DerivationInfo(
             derivationType: dInfo.derivationType,
@@ -325,7 +337,7 @@ class CWBitcoin extends Bitcoin {
           int derivationDepth = _countOccurrences(derivationPath, "/");
 
           // the correct derivation depth is dependant on the derivation type:
-          // the derivation paths defined in bitcoin_derivations are at the ROOT level, i.e.:
+          // the derivation paths defined in electrum_derivations are at the ROOT level, i.e.:
           // electrum's format doesn't specify subaddresses, just subaccounts:
 
           // for BIP44

lib/nano/cw_nano.dart

@@ -106,7 +106,6 @@ class CWNano extends Nano {
     required String mnemonic,
     required DerivationType derivationType,
   }) {
-    
     if (mnemonic.split(" ").length == 12 && derivationType != DerivationType.bip39) {
       throw Exception("Invalid mnemonic for derivation type!");
     }
@@ -126,7 +125,6 @@ class CWNano extends Nano {
     required String seedKey,
     required DerivationType derivationType,
   }) {
-
     if (seedKey.length == 128 && derivationType != DerivationType.bip39) {
       throw Exception("Invalid seed key length for derivation type!");
     }
@@ -192,7 +190,6 @@ class CWNano extends Nano {
 }
 
 class CWNanoUtil extends NanoUtil {
-
   @override
   bool isValidBip39Seed(String seed) {
     return NanoDerivations.isValidBip39Seed(seed);
@@ -346,4 +343,54 @@ class CWNanoUtil extends NanoUtil {
       return [DerivationType.nano, DerivationType.bip39];
     }
   }
+
+  @override
+  Future<List<DerivationInfo>> getDerivationsFromMnemonic({
+    String? mnemonic,
+    String? seedKey,
+    required Node node,
+  }) async {
+    List<DerivationInfo> list = [];
+
+    List<DerivationType> possibleDerivationTypes = await compareDerivationMethods(
+      mnemonic: mnemonic,
+      privateKey: seedKey,
+      node: node,
+    );
+    if (possibleDerivationTypes.length == 1) {
+      return [DerivationInfo(derivationType: possibleDerivationTypes.first)];
+    }
+
+    AccountInfoResponse? bip39Info = await nanoUtil!.getInfoFromSeedOrMnemonic(
+      DerivationType.bip39,
+      mnemonic: mnemonic,
+      seedKey: seedKey,
+      node: node,
+    );
+    AccountInfoResponse? standardInfo = await nanoUtil!.getInfoFromSeedOrMnemonic(
+      DerivationType.nano,
+      mnemonic: mnemonic,
+      seedKey: seedKey,
+      node: node,
+    );
+
+    if (standardInfo?.confirmationHeight != null && standardInfo!.confirmationHeight > 0) {
+      list.add(DerivationInfo(
+        derivationType: DerivationType.nano,
+        balance: nanoUtil!.getRawAsUsableString(standardInfo.balance, nanoUtil!.rawPerNano),
+        address: standardInfo.address!,
+        transactionsCount: standardInfo.confirmationHeight,
+      ));
+    }
+
+    if (bip39Info?.confirmationHeight != null && bip39Info!.confirmationHeight > 0) {
+      list.add(DerivationInfo(
+        derivationType: DerivationType.bip39,
+        balance: nanoUtil!.getRawAsUsableString(bip39Info.balance, nanoUtil!.rawPerNano),
+        address: bip39Info.address!,
+        transactionsCount: bip39Info.confirmationHeight,
+      ));
+    }
+    return list;
+  }
 }

lib/view_model/wallet_creation_vm.dart

@@ -113,13 +113,19 @@ abstract class WalletCreationVMBase with Store {
           derivationType: DerivationType.nano,
         );
       case WalletType.bitcoin:
-      case WalletType.litecoin:
         return DerivationInfo(
           derivationType: DerivationType.bip39,
           derivationPath: "m/84'/0'/0'/0",
           description: "Standard BIP84 native segwit",
           scriptType: "p2wpkh",
         );
+      case WalletType.litecoin:
+        return DerivationInfo(
+          derivationType: DerivationType.bip39,
+          derivationPath: "m/84'/2'/0'/0",
+          description: "Standard BIP84 native segwit (litecoin)",
+          scriptType: "p2wpkh",
+        );
       default:
         return null;
     }

lib/view_model/wallet_restore_view_model.dart

@@ -212,65 +212,17 @@ abstract class WalletRestoreViewModelBase extends WalletCreationVM with Store {
       case WalletType.nano:
         String? mnemonic = credentials['seed'] as String?;
         String? seedKey = credentials['private_key'] as String?;
-        AccountInfoResponse? bip39Info = await nanoUtil!.getInfoFromSeedOrMnemonic(
+        return nanoUtil!.getDerivationsFromMnemonic(
-            DerivationType.bip39,
-            mnemonic: mnemonic,
-            seedKey: seedKey,
-            node: node);
-        AccountInfoResponse? standardInfo = await nanoUtil!.getInfoFromSeedOrMnemonic(
-          DerivationType.nano,
           mnemonic: mnemonic,
           seedKey: seedKey,
           node: node,
         );
-
-        if (standardInfo?.balance != null) {
-          list.add(DerivationInfo(
-            derivationType: DerivationType.nano,
-            balance: nanoUtil!.getRawAsUsableString(standardInfo!.balance, nanoUtil!.rawPerNano),
-            address: standardInfo.address!,
-            transactionsCount: standardInfo.confirmationHeight,
-          ));
-        }
-
-        if (bip39Info?.balance != null) {
-          list.add(DerivationInfo(
-            derivationType: DerivationType.bip39,
-            balance: nanoUtil!.getRawAsUsableString(bip39Info!.balance, nanoUtil!.rawPerNano),
-            address: bip39Info.address!,
-            transactionsCount: bip39Info.confirmationHeight,
-          ));
-        }
-        break;
       default:
         break;
     }
     return list;
   }
 
-  Future<List<DerivationType>> getDerivationTypes(dynamic options) async {
-    final seedKey = options['private_key'] as String?;
-    final mnemonic = options['seed'] as String?;
-    WalletType walletType = options['walletType'] as WalletType;
-    var appStore = getIt.get<AppStore>();
-    var node = appStore.settingsStore.getCurrentNode(walletType);
-
-    switch (type) {
-      case WalletType.bitcoin:
-      case WalletType.litecoin:
-        return bitcoin!.compareDerivationMethods(mnemonic: mnemonic!, node: node);
-      case WalletType.nano:
-        return nanoUtil!.compareDerivationMethods(
-          mnemonic: mnemonic,
-          privateKey: seedKey,
-          node: node,
-        );
-      default:
-        break;
-    }
-    return [DerivationType.def];
-  }
-
   @override
   Future<WalletBase> process(WalletCredentials credentials) async {
     if (mode == WalletRestoreMode.keys) {

tool/configure.dart

@@ -84,7 +84,7 @@ import 'package:hive/hive.dart';
   const bitcoinCWHeaders = """
 import 'package:cw_bitcoin/utils.dart';
 import 'package:cw_bitcoin/litecoin_network.dart';
-import 'package:cw_bitcoin/bitcoin_derivations.dart';
+import 'package:cw_bitcoin/electrum_derivations.dart';
 import 'package:cw_bitcoin/electrum.dart';
 import 'package:cw_bitcoin/pending_bitcoin_transaction.dart';
 import 'package:cw_bitcoin/bitcoin_receive_page_option.dart';
@@ -914,6 +914,11 @@ abstract class NanoUtil {
     String? privateKey,
     required Node node,
   });
+  Future<List<DerivationInfo>> getDerivationsFromMnemonic({
+    String? mnemonic,
+    String? seedKey,
+    required Node node,
+  });
 }
   """;