Merge pull request #569 from fossephate/add-nano

Banano support

lib/models/isar/models/blockchain_data/address.dart

@@ -134,7 +134,8 @@ enum AddressType {
   unknown,
   nonWallet,
   ethereum,
-  nano;
+  nano,
+  banano;
 
   String get readableName {
     switch (this) {
@@ -156,6 +157,8 @@ enum AddressType {
         return "Ethereum";
       case AddressType.nano:
         return "Nano";
+      case AddressType.banano:
+        return "Banano";
     }
   }
 }

lib/models/isar/models/blockchain_data/address.g.dart

@@ -262,6 +262,7 @@ const _AddresstypeEnumValueMap = {
   'nonWallet': 6,
   'ethereum': 7,
   'nano': 8,
+  'banano': 9,
 };
 const _AddresstypeValueEnumMap = {
   0: AddressType.p2pkh,
@@ -273,6 +274,7 @@ const _AddresstypeValueEnumMap = {
   6: AddressType.nonWallet,
   7: AddressType.ethereum,
   8: AddressType.nano,
+  9: AddressType.banano,
 };
 
 Id _addressGetId(Address object) {

lib/pages/settings_views/global_settings_view/manage_nodes_views/add_edit_node_view.dart

@@ -729,6 +729,7 @@ class _NodeFormState extends ConsumerState<NodeForm> {
       case Coin.dogecoinTestNet:
       case Coin.epicCash:
       case Coin.nano:
+      case Coin.banano:
       case Coin.eCash:
         return false;
 

lib/pages_desktop_specific/my_stack_view/wallet_view/sub_widgets/desktop_send.dart

@@ -1430,7 +1430,7 @@ class _DesktopSendState extends ConsumerState<DesktopSend> {
           const SizedBox(
             height: 20,
           ),
-        if (!([Coin.nano, Coin.epicCash].contains(coin)))
+        if (!([Coin.nano, Coin.banano, Coin.epicCash].contains(coin)))
           Text(
             "Transaction fee (${coin == Coin.ethereum ? "max" : "estimated"})",
             style: STextStyles.desktopTextExtraSmall(context).copyWith(
@@ -1440,11 +1440,11 @@ class _DesktopSendState extends ConsumerState<DesktopSend> {
             ),
             textAlign: TextAlign.left,
           ),
-        if (!([Coin.nano, Coin.epicCash].contains(coin)))
+        if (!([Coin.nano, Coin.banano, Coin.epicCash].contains(coin)))
           const SizedBox(
             height: 10,
           ),
-        if (!([Coin.nano, Coin.epicCash].contains(coin)))
+        if (!([Coin.nano, Coin.banano, Coin.epicCash].contains(coin)))
           DesktopFeeDropDown(
             walletId: walletId,
           ),

lib/services/coins/coin_service.dart

@@ -24,6 +24,7 @@ import 'package:stackwallet/services/coins/firo/firo_wallet.dart';
 import 'package:stackwallet/services/coins/litecoin/litecoin_wallet.dart';
 import 'package:stackwallet/services/coins/monero/monero_wallet.dart';
 import 'package:stackwallet/services/coins/namecoin/namecoin_wallet.dart';
+import 'package:stackwallet/services/coins/nano/banano_wallet.dart';
 import 'package:stackwallet/services/coins/nano/nano_wallet.dart';
 import 'package:stackwallet/services/coins/particl/particl_wallet.dart';
 import 'package:stackwallet/services/coins/wownero/wownero_wallet.dart';
@@ -246,6 +247,15 @@ abstract class CoinServiceAPI {
             secureStore: secureStorageInterface
         );
 
+      case Coin.banano:
+        return BananoWallet(
+            walletId: walletId,
+            walletName: walletName,
+            coin: coin,
+            tracker: tracker,
+            secureStore: secureStorageInterface
+        );
+
       case Coin.dogecoinTestNet:
         return DogecoinWallet(
           walletId: walletId,

lib/services/coins/nano/banano_wallet.dart

@@ -0,0 +1,812 @@
+import 'dart:convert';
+
+import 'package:isar/isar.dart';
+import 'package:nanodart/nanodart.dart';
+import 'package:http/http.dart' as http;
+
+import 'package:stackwallet/models/balance.dart';
+import 'package:stackwallet/models/isar/models/blockchain_data/transaction.dart';
+import 'package:stackwallet/models/isar/models/blockchain_data/utxo.dart';
+import 'package:stackwallet/models/paymint/fee_object_model.dart';
+import 'package:stackwallet/services/coins/coin_service.dart';
+import 'package:stackwallet/services/event_bus/events/global/wallet_sync_status_changed_event.dart';
+import 'package:stackwallet/services/event_bus/global_event_bus.dart';
+import 'package:stackwallet/services/mixins/coin_control_interface.dart';
+import 'package:stackwallet/services/mixins/wallet_cache.dart';
+import 'package:stackwallet/services/mixins/wallet_db.dart';
+import 'package:stackwallet/utilities/amount/amount.dart';
+import 'package:stackwallet/utilities/enums/coin_enum.dart';
+import 'package:stackwallet/utilities/enums/log_level_enum.dart';
+import 'package:stackwallet/utilities/logger.dart';
+import 'package:tuple/tuple.dart';
+
+import '../../../db/isar/main_db.dart';
+import '../../../models/isar/models/blockchain_data/address.dart';
+import '../../../models/node_model.dart';
+import '../../../utilities/default_nodes.dart';
+import '../../../utilities/flutter_secure_storage_interface.dart';
+import '../../../utilities/prefs.dart';
+import '../../node_service.dart';
+import '../../transaction_notification_tracker.dart';
+
+import 'dart:async';
+
+import 'package:stackwallet/models/isar/models/isar_models.dart';
+
+const int MINIMUM_CONFIRMATIONS = 1;
+const String DEFAULT_REPRESENTATIVE =
+    "ban_1ka1ium4pfue3uxtntqsrib8mumxgazsjf58gidh1xeo5te3whsq8z476goo";
+
+class BananoWallet extends CoinServiceAPI
+    with WalletCache, WalletDB, CoinControlInterface {
+  BananoWallet({
+    required String walletId,
+    required String walletName,
+    required Coin coin,
+    required TransactionNotificationTracker tracker,
+    required SecureStorageInterface secureStore,
+    MainDB? mockableOverride,
+  }) {
+    txTracker = tracker;
+    _walletId = walletId;
+    _walletName = walletName;
+    _coin = coin;
+    _secureStore = secureStore;
+    initCache(walletId, coin);
+    initWalletDB(mockableOverride: mockableOverride);
+  }
+
+  NodeModel? _xnoNode;
+
+  @override
+  Future<String?> get mnemonicPassphrase => _secureStore.read(
+        key: '${_walletId}_mnemonicPassphrase',
+      );
+
+  @override
+  Future<String?> get mnemonicString =>
+      _secureStore.read(key: '${_walletId}_mnemonic');
+
+  Future<String> getSeedFromMnemonic() async {
+    var mnemonic = await mnemonicString;
+    return NanoMnemomics.mnemonicListToSeed(mnemonic!.split(" "));
+  }
+
+  Future<String> getPrivateKeyFromMnemonic() async {
+    var mnemonic = await mnemonicString;
+    var seed = NanoMnemomics.mnemonicListToSeed(mnemonic!.split(" "));
+    return NanoKeys.seedToPrivate(seed, 0);
+  }
+
+  Future<String> getAddressFromMnemonic() async {
+    var mnemonic = await mnemonicString;
+    var seed = NanoMnemomics.mnemonicListToSeed(mnemonic!.split(' '));
+    var address = NanoAccounts.createAccount(NanoAccountType.BANANO,
+        NanoKeys.createPublicKey(NanoKeys.seedToPrivate(seed, 0)));
+    return address;
+  }
+
+  Future<String> getPublicKeyFromMnemonic() async {
+    var mnemonic = await mnemonicString;
+    if (mnemonic == null) {
+      return "";
+    } else {
+      var seed = NanoMnemomics.mnemonicListToSeed(mnemonic.split(" "));
+      return NanoKeys.createPublicKey(NanoKeys.seedToPrivate(seed, 0));
+    }
+  }
+
+  @override
+  String get walletId => _walletId;
+  late String _walletId;
+
+  @override
+  String get walletName => _walletName;
+  late String _walletName;
+
+  @override
+  set walletName(String name) => _walletName = name;
+
+  @override
+  set isFavorite(bool markFavorite) {
+    _isFavorite = markFavorite;
+    updateCachedIsFavorite(markFavorite);
+  }
+
+  @override
+  bool get isFavorite => _isFavorite ??= getCachedIsFavorite();
+  bool? _isFavorite;
+
+  @override
+  Coin get coin => _coin;
+  late Coin _coin;
+
+  late SecureStorageInterface _secureStore;
+  late final TransactionNotificationTracker txTracker;
+  final _prefs = Prefs.instance;
+
+  bool _shouldAutoSync = false;
+
+  @override
+  bool get shouldAutoSync => _shouldAutoSync;
+
+  @override
+  set shouldAutoSync(bool shouldAutoSync) => _shouldAutoSync = shouldAutoSync;
+
+  @override
+  Balance get balance => _balance ??= getCachedBalance();
+  Balance? _balance;
+
+  Future<String?> requestWork(String hash) async {
+    return http
+        .post(
+      Uri.parse("https://rpc.nano.to"), // this should be a
+      headers: {'Content-type': 'application/json'},
+      body: json.encode(
+        {
+          "action": "work_generate",
+          "hash": hash,
+        },
+      ),
+    )
+        .then((http.Response response) {
+      if (response.statusCode == 200) {
+        final Map<String, dynamic> decoded =
+            json.decode(response.body) as Map<String, dynamic>;
+        if (decoded.containsKey("error")) {
+          throw Exception("Received error ${decoded["error"]}");
+        }
+        return decoded["work"] as String?;
+      } else {
+        throw Exception("Received error ${response.statusCode}");
+      }
+    });
+  }
+
+  @override
+  Future<String> confirmSend({required Map<String, dynamic> txData}) async {
+    try {
+      // our address:
+      final String publicAddress = await getAddressFromMnemonic();
+
+      // first get the account balance:
+      final balanceBody = jsonEncode({
+        "action": "account_balance",
+        "account": publicAddress,
+      });
+      final headers = {
+        "Content-Type": "application/json",
+      };
+      final balanceResponse = await http.post(
+        Uri.parse(getCurrentNode().host),
+        headers: headers,
+        body: balanceBody,
+      );
+      final balanceData = jsonDecode(balanceResponse.body);
+
+      final BigInt currentBalance =
+          BigInt.parse(balanceData["balance"].toString());
+      final BigInt txAmount = txData["recipientAmt"].raw as BigInt;
+      final BigInt balanceAfterTx = currentBalance - txAmount;
+
+      // get the account info (we need the frontier and representative):
+      final infoBody = jsonEncode({
+        "action": "account_info",
+        "representative": "true",
+        "account": publicAddress,
+      });
+      final infoResponse = await http.post(
+        Uri.parse(getCurrentNode().host),
+        headers: headers,
+        body: infoBody,
+      );
+
+      final String frontier =
+          jsonDecode(infoResponse.body)["frontier"].toString();
+      final String representative =
+          jsonDecode(infoResponse.body)["representative"].toString();
+      // link = destination address:
+      final String link =
+          NanoAccounts.extractPublicKey(txData["address"].toString());
+      final String linkAsAccount = txData["address"].toString();
+
+      // construct the send block:
+      Map<String, String> sendBlock = {
+        "type": "state",
+        "account": publicAddress,
+        "previous": frontier,
+        "representative": representative,
+        "balance": balanceAfterTx.toString(),
+        "link": link,
+      };
+
+      // sign the send block:
+      final String hash = NanoBlocks.computeStateHash(
+        NanoAccountType.BANANO,
+        sendBlock["account"]!,
+        sendBlock["previous"]!,
+        sendBlock["representative"]!,
+        BigInt.parse(sendBlock["balance"]!),
+        sendBlock["link"]!,
+      );
+      final String privateKey = await getPrivateKeyFromMnemonic();
+      final String signature = NanoSignatures.signBlock(hash, privateKey);
+
+      // get PoW for the send block:
+      final String? work = await requestWork(frontier);
+      if (work == null) {
+        throw Exception("Failed to get PoW for send block");
+      }
+
+      sendBlock["link_as_account"] = linkAsAccount;
+      sendBlock["signature"] = signature;
+      sendBlock["work"] = work;
+
+      final processBody = jsonEncode({
+        "action": "process",
+        "json_block": "true",
+        "subtype": "send",
+        "block": sendBlock,
+      });
+      final processResponse = await http.post(
+        Uri.parse(getCurrentNode().host),
+        headers: headers,
+        body: processBody,
+      );
+
+      final Map<String, dynamic> decoded =
+          json.decode(processResponse.body) as Map<String, dynamic>;
+      if (decoded.containsKey("error")) {
+        throw Exception("Received error ${decoded["error"]}");
+      }
+
+      // return the hash of the transaction:
+      return decoded["hash"].toString();
+    } catch (e, s) {
+      Logging.instance
+          .log("Error sending transaction $e - $s", level: LogLevel.Error);
+      rethrow;
+    }
+  }
+
+  @override
+  Future<String> get currentReceivingAddress => getAddressFromMnemonic();
+
+  @override
+  Future<Amount> estimateFeeFor(Amount amount, int feeRate) {
+    // fees are always 0 :)
+    return Future.value(
+        Amount(rawValue: BigInt.from(0), fractionDigits: coin.decimals));
+  }
+
+  @override
+  Future<void> exit() async {
+    _hasCalledExit = true;
+  }
+
+  @override
+  // TODO: implement fees
+  Future<FeeObject> get fees => throw UnimplementedError();
+
+  Future<void> updateBalance() async {
+    final body = jsonEncode({
+      "action": "account_balance",
+      "account": await getAddressFromMnemonic(),
+    });
+    final headers = {
+      "Content-Type": "application/json",
+    };
+    final response = await http.post(Uri.parse(getCurrentNode().host),
+        headers: headers, body: body);
+    final data = jsonDecode(response.body);
+    _balance = Balance(
+      total: Amount(
+          rawValue: (BigInt.parse(data["balance"].toString()) +
+              BigInt.parse(data["receivable"].toString())),
+          fractionDigits: coin.decimals),
+      spendable: Amount(
+          rawValue: BigInt.parse(data["balance"].toString()),
+          fractionDigits: coin.decimals),
+      blockedTotal:
+          Amount(rawValue: BigInt.parse("0"), fractionDigits: coin.decimals),
+      pendingSpendable: Amount(
+          rawValue: BigInt.parse(data["receivable"].toString()),
+          fractionDigits: coin.decimals),
+    );
+    await updateCachedBalance(_balance!);
+  }
+
+  Future<void> receiveBlock(
+      String blockHash, String source, String amountRaw) async {
+    // TODO: the opening block of an account is a special case
+    bool openBlock = false;
+
+    final headers = {
+      "Content-Type": "application/json",
+    };
+
+    // our address:
+    final String publicAddress = await getAddressFromMnemonic();
+
+    // first check if the account is open:
+    // get the account info (we need the frontier and representative):
+    final infoBody = jsonEncode({
+      "action": "account_info",
+      "representative": "true",
+      "account": publicAddress,
+    });
+    final infoResponse = await http.post(
+      Uri.parse(getCurrentNode().host),
+      headers: headers,
+      body: infoBody,
+    );
+    final infoData = jsonDecode(infoResponse.body);
+
+    if (infoData["error"] != null) {
+      // account is not open yet, we need to create an open block:
+      openBlock = true;
+    }
+
+    // first get the account balance:
+    final balanceBody = jsonEncode({
+      "action": "account_balance",
+      "account": publicAddress,
+    });
+
+    final balanceResponse = await http.post(
+      Uri.parse(getCurrentNode().host),
+      headers: headers,
+      body: balanceBody,
+    );
+
+    final balanceData = jsonDecode(balanceResponse.body);
+    final BigInt currentBalance =
+        BigInt.parse(balanceData["balance"].toString());
+    final BigInt txAmount = BigInt.parse(amountRaw);
+    final BigInt balanceAfterTx = currentBalance + txAmount;
+
+    String frontier = infoData["frontier"].toString();
+    String representative = infoData["representative"].toString();
+
+    if (openBlock) {
+      // we don't have a representative set yet:
+      representative = DEFAULT_REPRESENTATIVE;
+    }
+
+    // link = send block hash:
+    final String link = blockHash;
+    // this "linkAsAccount" is meaningless:
+    final String linkAsAccount =
+        NanoAccounts.createAccount(NanoAccountType.BANANO, blockHash);
+
+    // construct the receive block:
+    Map<String, String> receiveBlock = {
+      "type": "state",
+      "account": publicAddress,
+      "previous": openBlock
+          ? "0000000000000000000000000000000000000000000000000000000000000000"
+          : frontier,
+      "representative": representative,
+      "balance": balanceAfterTx.toString(),
+      "link": link,
+      "link_as_account": linkAsAccount,
+    };
+
+    // sign the receive block:
+    final String hash = NanoBlocks.computeStateHash(
+      NanoAccountType.BANANO,
+      receiveBlock["account"]!,
+      receiveBlock["previous"]!,
+      receiveBlock["representative"]!,
+      BigInt.parse(receiveBlock["balance"]!),
+      receiveBlock["link"]!,
+    );
+    final String privateKey = await getPrivateKeyFromMnemonic();
+    final String signature = NanoSignatures.signBlock(hash, privateKey);
+
+    // get PoW for the receive block:
+    String? work;
+    if (openBlock) {
+      work = await requestWork(NanoAccounts.extractPublicKey(publicAddress));
+    } else {
+      work = await requestWork(frontier);
+    }
+    if (work == null) {
+      throw Exception("Failed to get PoW for receive block");
+    }
+    receiveBlock["link_as_account"] = linkAsAccount;
+    receiveBlock["signature"] = signature;
+    receiveBlock["work"] = work;
+
+    // process the receive block:
+
+    final processBody = jsonEncode({
+      "action": "process",
+      "json_block": "true",
+      "subtype": "receive",
+      "block": receiveBlock,
+    });
+    final processResponse = await http.post(
+      Uri.parse(getCurrentNode().host),
+      headers: headers,
+      body: processBody,
+    );
+
+    final Map<String, dynamic> decoded =
+        json.decode(processResponse.body) as Map<String, dynamic>;
+    if (decoded.containsKey("error")) {
+      throw Exception("Received error ${decoded["error"]}");
+    }
+  }
+
+  Future<void> confirmAllReceivable() async {
+    final receivableResponse = await http.post(Uri.parse(getCurrentNode().host),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({
+          "action": "receivable",
+          "source": "true",
+          "account": await getAddressFromMnemonic(),
+          "count": "-1",
+        }));
+
+    final receivableData = await jsonDecode(receivableResponse.body);
+    if (receivableData["blocks"] == "") {
+      return;
+    }
+    final blocks = receivableData["blocks"] as Map<String, dynamic>;
+    // confirm all receivable blocks:
+    for (final blockHash in blocks.keys) {
+      final block = blocks[blockHash];
+      final String amountRaw = block["amount"] as String;
+      final String source = block["source"] as String;
+      await receiveBlock(blockHash, source, amountRaw);
+      // a bit of a hack:
+      await Future<void>.delayed(const Duration(seconds: 1));
+    }
+  }
+
+  Future<void> updateTransactions() async {
+    await confirmAllReceivable();
+    final String publicAddress = await getAddressFromMnemonic();
+    final response = await http.post(Uri.parse(getCurrentNode().host),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({
+          "action": "account_history",
+          "account": publicAddress,
+          "count": "-1",
+        }));
+    final data = await jsonDecode(response.body);
+    final transactions = data["history"] as List<dynamic>;
+    if (transactions.isEmpty) {
+      return;
+    } else {
+      List<Tuple2<Transaction, Address?>> transactionList = [];
+      for (var tx in transactions) {
+        var typeString = tx["type"].toString();
+        TransactionType transactionType = TransactionType.unknown;
+        if (typeString == "send") {
+          transactionType = TransactionType.outgoing;
+        } else if (typeString == "receive") {
+          transactionType = TransactionType.incoming;
+        }
+        final amount = Amount(
+          rawValue: BigInt.parse(tx["amount"].toString()),
+          fractionDigits: coin.decimals,
+        );
+
+        var transaction = Transaction(
+          walletId: walletId,
+          txid: tx["hash"].toString(),
+          timestamp: int.parse(tx["local_timestamp"].toString()),
+          type: transactionType,
+          subType: TransactionSubType.none,
+          amount: 0,
+          amountString: amount.toJsonString(),
+          fee: 0,
+          height: int.parse(tx["height"].toString()),
+          isCancelled: false,
+          isLelantus: false,
+          slateId: "",
+          otherData: "",
+          inputs: [],
+          outputs: [],
+          nonce: 0,
+        );
+
+        Address address = Address(
+          walletId: walletId,
+          publicKey: [],
+          value: transactionType == TransactionType.incoming
+              ? publicAddress
+              : tx["account"].toString(),
+          derivationIndex: 0,
+          derivationPath: null,
+          type: transactionType == TransactionType.incoming
+              ? AddressType.nonWallet
+              : AddressType.banano,
+          subType: transactionType == TransactionType.incoming
+              ? AddressSubType.receiving
+              : AddressSubType.nonWallet,
+        );
+        Tuple2<Transaction, Address> tuple = Tuple2(transaction, address);
+        transactionList.add(tuple);
+      }
+
+      await db.addNewTransactionData(transactionList, walletId);
+
+      return;
+    }
+  }
+
+  @override
+  Future<void> fullRescan(
+      int maxUnusedAddressGap, int maxNumberOfIndexesToCheck) async {
+    await _prefs.init();
+    await updateTransactions();
+    await updateBalance();
+  }
+
+  @override
+  Future<bool> generateNewAddress() {
+    // TODO: implement generateNewAddress
+    throw UnimplementedError();
+  }
+
+  @override
+  bool get hasCalledExit => _hasCalledExit;
+  bool _hasCalledExit = false;
+
+  @override
+  Future<void> initializeExisting() async {
+    await _prefs.init();
+  }
+
+  @override
+  Future<void> initializeNew() async {
+    if ((await mnemonicString) != null || (await mnemonicPassphrase) != null) {
+      throw Exception(
+          "Attempted to overwrite mnemonic on generate new wallet!");
+    }
+
+    await _prefs.init();
+
+    String seed = NanoSeeds.generateSeed();
+    final mnemonic = NanoMnemomics.seedToMnemonic(seed);
+    await _secureStore.write(
+      key: '${_walletId}_mnemonic',
+      value: mnemonic.join(' '),
+    );
+    await _secureStore.write(
+      key: '${_walletId}_mnemonicPassphrase',
+      value: "",
+    );
+    String privateKey = NanoKeys.seedToPrivate(seed, 0);
+    String publicKey = NanoKeys.createPublicKey(privateKey);
+    String publicAddress =
+        NanoAccounts.createAccount(NanoAccountType.BANANO, publicKey);
+
+    final address = Address(
+      walletId: walletId,
+      value: publicAddress,
+      publicKey: [], // TODO: add public key
+      derivationIndex: 0,
+      derivationPath: null,
+      type: AddressType.unknown,
+      subType: AddressSubType.receiving,
+    );
+
+    await db.putAddress(address);
+
+    await Future.wait(
+        [updateCachedId(walletId), updateCachedIsFavorite(false)]);
+  }
+
+  @override
+  bool get isConnected => _isConnected;
+
+  bool _isConnected = false;
+
+  @override
+  bool get isRefreshing => refreshMutex;
+
+  bool refreshMutex = false;
+
+  @override
+  Future<int> get maxFee => Future.value(0);
+
+  @override
+  Future<List<String>> get mnemonic => _getMnemonicList();
+
+  Future<List<String>> _getMnemonicList() async {
+    final _mnemonicString = await mnemonicString;
+    if (_mnemonicString == null) {
+      return [];
+    }
+    final List<String> data = _mnemonicString.split(' ');
+    return data;
+  }
+
+  @override
+  Future<Map<String, dynamic>> prepareSend({
+    required String address,
+    required Amount amount,
+    Map<String, dynamic>? args,
+  }) async {
+    try {
+      int satAmount = amount.raw.toInt();
+      int realfee = 0;
+
+      if (balance.spendable == amount) {
+        satAmount = balance.spendable.raw.toInt() - realfee;
+      }
+
+      Map<String, dynamic> txData = {
+        "fee": realfee,
+        "addresss": address,
+        "recipientAmt": Amount(
+          rawValue: BigInt.from(satAmount),
+          fractionDigits: coin.decimals,
+        ),
+      };
+
+      Logging.instance.log("prepare send: $txData", level: LogLevel.Info);
+      return txData;
+    } catch (e, s) {
+      Logging.instance.log("Error getting fees $e - $s", level: LogLevel.Error);
+      rethrow;
+    }
+  }
+
+  @override
+  Future<void> recoverFromMnemonic(
+      {required String mnemonic,
+      String? mnemonicPassphrase,
+      required int maxUnusedAddressGap,
+      required int maxNumberOfIndexesToCheck,
+      required int height}) async {
+    try {
+      if ((await mnemonicString) != null ||
+          (await this.mnemonicPassphrase) != null) {
+        throw Exception("Attempted to overwrite mnemonic on restore!");
+      }
+
+      await _secureStore.write(
+          key: '${_walletId}_mnemonic', value: mnemonic.trim());
+      await _secureStore.write(
+        key: '${_walletId}_mnemonicPassphrase',
+        value: mnemonicPassphrase ?? "",
+      );
+
+      String seed = NanoMnemomics.mnemonicListToSeed(mnemonic.split(" "));
+      String privateKey = NanoKeys.seedToPrivate(seed, 0);
+      String publicKey = NanoKeys.createPublicKey(privateKey);
+      String publicAddress =
+          NanoAccounts.createAccount(NanoAccountType.BANANO, publicKey);
+
+      final address = Address(
+        walletId: walletId,
+        value: publicAddress,
+        publicKey: [], // TODO: add public key
+        derivationIndex: 0,
+        derivationPath: null,
+        type: AddressType.unknown,
+        subType: AddressSubType.receiving,
+      );
+
+      await db.putAddress(address);
+
+      await Future.wait(
+          [updateCachedId(walletId), updateCachedIsFavorite(false)]);
+    } catch (e) {
+      rethrow;
+    }
+  }
+
+  @override
+  Future<void> refresh() async {
+    await _prefs.init();
+
+    GlobalEventBus.instance.fire(
+      WalletSyncStatusChangedEvent(
+        WalletSyncStatus.syncing,
+        walletId,
+        coin,
+      ),
+    );
+
+    try {
+      await updateChainHeight();
+      await updateTransactions();
+      await updateBalance();
+
+      GlobalEventBus.instance.fire(
+        WalletSyncStatusChangedEvent(
+          WalletSyncStatus.synced,
+          walletId,
+          coin,
+        ),
+      );
+    } catch (e) {
+      GlobalEventBus.instance.fire(
+        WalletSyncStatusChangedEvent(
+          WalletSyncStatus.unableToSync,
+          walletId,
+          coin,
+        ),
+      );
+    }
+  }
+
+  @override
+  int get storedChainHeight => getCachedChainHeight();
+
+  NodeModel getCurrentNode() {
+    return _xnoNode ??
+        NodeService(secureStorageInterface: _secureStore)
+            .getPrimaryNodeFor(coin: coin) ??
+        DefaultNodes.getNodeFor(coin);
+  }
+
+  @override
+  Future<bool> testNetworkConnection() {
+    http
+        .get(Uri.parse("${getCurrentNode().host}?action=version"))
+        .then((response) {
+      if (response.statusCode == 200) {
+        return true;
+      }
+    });
+    return Future.value(false);
+  }
+
+  @override
+  Future<List<Transaction>> get transactions =>
+      db.getTransactions(walletId).findAll();
+
+  @override
+  Future<void> updateNode(bool shouldRefresh) async {
+    _xnoNode = NodeService(secureStorageInterface: _secureStore)
+            .getPrimaryNodeFor(coin: coin) ??
+        DefaultNodes.getNodeFor(coin);
+
+    if (shouldRefresh) {
+      unawaited(refresh());
+    }
+  }
+
+  @override
+  Future<void> updateSentCachedTxData(Map<String, dynamic> txData) {
+    // TODO: implement updateSentCachedTxData
+    throw UnimplementedError();
+  }
+
+  @override
+  // TODO: implement utxos
+  Future<List<UTXO>> get utxos => throw UnimplementedError();
+
+  @override
+  bool validateAddress(String address) {
+    return NanoAccounts.isValid(NanoAccountType.BANANO, address);
+  }
+
+  Future<void> updateChainHeight() async {
+    final String publicAddress = await getAddressFromMnemonic();
+    // first get the account balance:
+    final infoBody = jsonEncode({
+      "action": "account_info",
+      "account": publicAddress,
+    });
+    final headers = {
+      "Content-Type": "application/json",
+    };
+    final infoResponse = await http.post(
+      Uri.parse(getCurrentNode().host),
+      headers: headers,
+      body: infoBody,
+    );
+    final infoData = jsonDecode(infoResponse.body);
+
+    final int height = int.parse(infoData["confirmation_height"].toString());
+    await updateCachedChainHeight(height);
+  }
+}

lib/services/price.dart

@@ -100,7 +100,7 @@ class PriceAPI {
           Uri.parse("https://api.coingecko.com/api/v3/coins/markets?vs_currency"
               "=${baseCurrency.toLowerCase()}"
               "&ids=monero,bitcoin,litecoin,ecash,epic-cash,zcoin,dogecoin,"
-              "bitcoin-cash,namecoin,wownero,ethereum,particl,nano"
+              "bitcoin-cash,namecoin,wownero,ethereum,particl,nano,ban"
               "&order=market_cap_desc&per_page=50&page=1&sparkline=false");
 
       final coinGeckoResponse = await client.get(

lib/themes/color_theme.dart

@@ -29,6 +29,7 @@ class CoinThemeColorDefault {
   Color get wownero => const Color(0xFFED80C1);
   Color get particl => const Color(0xFF8175BD);
   Color get nano => const Color(0xFF209CE9);
+  Color get banano => const Color(0xFFFBDD11);
 
   Color forCoin(Coin coin) {
     switch (coin) {
@@ -63,6 +64,8 @@ class CoinThemeColorDefault {
         return particl;
       case Coin.nano:
         return nano;
+      case Coin.banano:
+        return banano;
     }
   }
 }

lib/themes/stack_colors.dart

@@ -1709,6 +1709,8 @@ class StackColors extends ThemeExtension<StackColors> {
         return _coin.particl;
       case Coin.nano:
         return _coin.nano;
+      case Coin.banano:
+        return _coin.banano;
     }
   }
 

lib/utilities/address_utils.dart

@@ -87,6 +87,8 @@ class AddressUtils {
         return Address.validateAddress(address, particl);
       case Coin.nano:
         return NanoAccounts.isValid(NanoAccountType.NANO, address);
+      case Coin.banano:
+        return NanoAccounts.isValid(NanoAccountType.BANANO, address);
       case Coin.bitcoinTestNet:
         return Address.validateAddress(address, testnet);
       case Coin.litecoinTestNet:

lib/utilities/block_explorers.dart

@@ -56,6 +56,8 @@ Uri getDefaultBlockExplorerUrlFor({
       return Uri.parse("https://chainz.cryptoid.info/part/tx.dws?$txid.htm");
     case Coin.nano:
       return Uri.parse("https://www.nanolooker.com/block/$txid");
+    case Coin.banano:
+      return Uri.parse("https://www.bananolooker.com/block/$txid");
   }
 }
 

lib/utilities/constants.dart

@@ -40,10 +40,13 @@ abstract class Constants {
   static final BigInt _satsPerCoinMonero = BigInt.from(1000000000000);
   static final BigInt _satsPerCoinWownero = BigInt.from(100000000000);
   static final BigInt _satsPerCoinNano =
-      BigInt.parse("1000000000000000000000000000000");
+      BigInt.parse("1000000000000000000000000000000");// 1*10^30
+  static final BigInt _satsPerCoinBanano =
+      BigInt.parse("100000000000000000000000000000");// 1*10^29
   static final BigInt _satsPerCoin = BigInt.from(100000000);
   static const int _decimalPlaces = 8;
   static const int _decimalPlacesNano = 30;
+  static const int _decimalPlacesBanano = 29;
   static const int _decimalPlacesWownero = 11;
   static const int _decimalPlacesMonero = 12;
   static const int _decimalPlacesEthereum = 18;
@@ -79,6 +82,9 @@ abstract class Constants {
       case Coin.nano:
         return _satsPerCoinNano;
 
+      case Coin.banano:
+        return _satsPerCoinBanano;
+
       case Coin.wownero:
         return _satsPerCoinWownero;
 
@@ -113,6 +119,9 @@ abstract class Constants {
       case Coin.nano:
         return _decimalPlacesNano;
 
+      case Coin.banano:
+        return _decimalPlacesBanano;
+
       case Coin.wownero:
         return _decimalPlacesWownero;
 
@@ -146,7 +155,10 @@ abstract class Constants {
       case Coin.namecoin:
       case Coin.particl:
       case Coin.nano:
-        values.addAll([24, 21, 18, 15, 12]);
+        values.addAll([24, 12]);
+        break;
+      case Coin.banano:
+        values.addAll([24, 12]);
         break;
 
       case Coin.monero:
@@ -200,7 +212,8 @@ abstract class Constants {
         return 600;
 
       case Coin.nano: // TODO: Verify this
-        return 3;
+      case Coin.banano: // TODO: Verify this
+        return 1;
     }
   }
 

lib/utilities/default_nodes.dart

@@ -190,8 +190,18 @@ abstract class DefaultNodes {
       enabled: true,
       coinName: Coin.nano.name,
       isFailover: true,
-      isDown: false
+      isDown: false);
-  );
+
+  static NodeModel get banano => NodeModel(
+      host: "https://kaliumapi.appditto.com/api",
+      port: 443,
+      name: defaultName,
+      id: _nodeId(Coin.banano),
+      useSSL: true,
+      enabled: true,
+      coinName: Coin.banano.name,
+      isFailover: true,
+      isDown: false);
 
   static NodeModel get bitcoinTestnet => NodeModel(
         host: "bitcoin-testnet.stackwallet.com",
@@ -294,6 +304,9 @@ abstract class DefaultNodes {
       case Coin.nano:
         return nano;
 
+      case Coin.banano:
+        return banano;
+
       case Coin.bitcoinTestNet:
         return bitcoinTestnet;
 

lib/utilities/enums/coin_enum.dart

@@ -44,6 +44,7 @@ enum Coin {
   particl,
   wownero,
   nano,
+  banano,
 
   ///
 
@@ -89,6 +90,8 @@ extension CoinExt on Coin {
         return "Namecoin";
       case Coin.nano:
         return "Nano";
+      case Coin.banano:
+        return "Banano";
       case Coin.bitcoinTestNet:
         return "tBitcoin";
       case Coin.litecoinTestNet:
@@ -130,6 +133,8 @@ extension CoinExt on Coin {
         return "NMC";
       case Coin.nano:
         return "XNO";
+      case Coin.banano:
+        return "BAN";
       case Coin.bitcoinTestNet:
         return "tBTC";
       case Coin.litecoinTestNet:
@@ -172,6 +177,8 @@ extension CoinExt on Coin {
         return "namecoin";
       case Coin.nano:
         return "nano";
+      case Coin.banano:
+        return "ban";
       case Coin.bitcoinTestNet:
         return "bitcoin";
       case Coin.litecoinTestNet:
@@ -206,7 +213,8 @@ extension CoinExt on Coin {
       case Coin.ethereum:
       case Coin.monero:
       case Coin.wownero:
-      case Coin.nano: // TODO: Check this
+      case Coin.nano:
+      case Coin.banano:
         return false;
     }
   }
@@ -233,6 +241,7 @@ extension CoinExt on Coin {
       case Coin.bitcoincashTestnet:
       case Coin.firoTestNet:
       case Coin.nano:
+      case Coin.banano:
         return false;
     }
   }
@@ -251,6 +260,7 @@ extension CoinExt on Coin {
       case Coin.monero:
       case Coin.wownero:
       case Coin.nano:
+      case Coin.banano:
       case Coin.eCash:
         return false;
 
@@ -277,6 +287,7 @@ extension CoinExt on Coin {
       case Coin.monero:
       case Coin.wownero:
       case Coin.nano:
+      case Coin.banano:
       case Coin.eCash:
         return this;
 
@@ -341,6 +352,7 @@ extension CoinExt on Coin {
         return nmc.MINIMUM_CONFIRMATIONS;
 
       case Coin.nano:
+      case Coin.banano:
         return nano.MINIMUM_CONFIRMATIONS;
     }
   }
@@ -432,6 +444,10 @@ Coin coinFromPrettyName(String name) {
     case "nano":
       return Coin.nano;
 
+    case "Banano":
+    case "banano":
+      return Coin.banano;
+
     default:
       throw ArgumentError.value(
         name,
@@ -479,6 +495,8 @@ Coin coinFromTickerCaseInsensitive(String ticker) {
       return Coin.wownero;
     case "xno":
       return Coin.nano;
+    case "ban":
+      return Coin.banano;
     default:
       throw ArgumentError.value(
           ticker, "name", "No Coin enum value with that ticker");

lib/utilities/enums/derive_path_type_enum.dart

@@ -48,6 +48,7 @@ extension DerivePathTypeExt on DerivePathType {
       case Coin.monero:
       case Coin.wownero:
       case Coin.nano:
+      case Coin.banano:
         throw UnsupportedError(
             "$coin does not use bitcoin style derivation paths");
     }