Enable Eth/Erc20 auto send in exchange (#1024)

* Generate missing secrets file for ethereum

* Enable Sending ERC-20 and Ethereum automatically from an Exchange

.github/workflows/pr_test_build.yml

@@ -99,6 +99,7 @@ jobs:
         run: |
           cd /opt/android/cake_wallet
           touch lib/.secrets.g.dart
+          touch cw_ethereum/lib/.secrets.g.dart
           echo "const salt = '${{ secrets.SALT }}';" > lib/.secrets.g.dart
           echo "const keychainSalt = '${{ secrets.KEY_CHAIN_SALT }}';" >> lib/.secrets.g.dart
           echo "const key = '${{ secrets.KEY }}';" >> lib/.secrets.g.dart

cw_core/lib/erc20_token.dart

@@ -57,7 +57,8 @@ class Erc20Token extends CryptoCurrency with HiveObjectMixin {
   static const boxName = 'Erc20Tokens';
 
   @override
-  bool operator ==(other) => other is Erc20Token && other.contractAddress == contractAddress;
+  bool operator ==(other) => (other is Erc20Token && other.contractAddress == contractAddress) ||
+      (other is CryptoCurrency && other.title == title);
 
   @override
   int get hashCode => contractAddress.hashCode;

cw_ethereum/lib/ethereum_wallet.dart

@@ -156,15 +156,19 @@ abstract class EthereumWalletBase
     final _credentials = credentials as EthereumTransactionCredentials;
     final outputs = _credentials.outputs;
     final hasMultiDestination = outputs.length > 1;
-    final _erc20Balance = balance[_credentials.currency]!;
+
+    final CryptoCurrency transactionCurrency =
+        balance.keys.firstWhere((element) => element.title == _credentials.currency.title);
+
+    final _erc20Balance = balance[transactionCurrency]!;
     BigInt totalAmount = BigInt.zero;
-    int exponent =
-        _credentials.currency is Erc20Token ? (_credentials.currency as Erc20Token).decimal : 18;
+    int exponent = transactionCurrency is Erc20Token ? transactionCurrency.decimal : 18;
     num amountToEthereumMultiplier = pow(10, exponent);
 
+    // so far this can not be made with Ethereum as Ethereum does not support multiple recipients
     if (hasMultiDestination) {
       if (outputs.any((item) => item.sendAll || (item.formattedCryptoAmount ?? 0) <= 0)) {
-        throw EthereumTransactionCreationException(_credentials.currency);
+        throw EthereumTransactionCreationException(transactionCurrency);
       }
 
       final totalOriginalAmount = EthereumFormatter.parseEthereumAmountToDouble(
@@ -172,7 +176,7 @@ abstract class EthereumWalletBase
       totalAmount = BigInt.from(totalOriginalAmount * amountToEthereumMultiplier);
 
       if (_erc20Balance.balance < totalAmount) {
-        throw EthereumTransactionCreationException(_credentials.currency);
+        throw EthereumTransactionCreationException(transactionCurrency);
       }
     } else {
       final output = outputs.first;
@@ -185,7 +189,7 @@ abstract class EthereumWalletBase
           : BigInt.from(totalOriginalAmount * amountToEthereumMultiplier);
 
       if (_erc20Balance.balance < totalAmount) {
-        throw EthereumTransactionCreationException(_credentials.currency);
+        throw EthereumTransactionCreationException(transactionCurrency);
       }
     }
 
@@ -195,11 +199,10 @@ abstract class EthereumWalletBase
       amount: totalAmount.toString(),
       gas: _estimatedGas!,
       priority: _credentials.priority!,
-      currency: _credentials.currency,
+      currency: transactionCurrency,
       exponent: exponent,
-      contractAddress: _credentials.currency is Erc20Token
-          ? (_credentials.currency as Erc20Token).contractAddress
-          : null,
+      contractAddress:
+          transactionCurrency is Erc20Token ? transactionCurrency.contractAddress : null,
     );
 
     return pendingEthereumTransaction;

lib/view_model/exchange/exchange_trade_view_model.dart

@@ -29,7 +29,9 @@ abstract class ExchangeTradeViewModelBase with Store {
       required this.sendViewModel})
       : trade = tradesStore.trade!,
         isSendable = tradesStore.trade!.from == wallet.currency ||
-            tradesStore.trade!.provider == ExchangeProviderDescription.xmrto,
+            tradesStore.trade!.provider == ExchangeProviderDescription.xmrto ||
+            (wallet.currency == CryptoCurrency.eth &&
+                tradesStore.trade!.from.tag == CryptoCurrency.eth.title),
         items = ObservableList<ExchangeTradeItem>() {
     switch (trade.provider) {
       case ExchangeProviderDescription.xmrto:
@@ -103,6 +105,7 @@ abstract class ExchangeTradeViewModelBase with Store {
     final output = sendViewModel.outputs.first;
     output.address = trade.inputAddress ?? '';
     output.setCryptoAmount(trade.amount);
+    sendViewModel.selectedCryptoCurrency = trade.from;
     await sendViewModel.createTransaction();
   }
 

lib/view_model/restore/restore_from_qr_vm.dart

@@ -1,4 +1,5 @@
 import 'package:cake_wallet/bitcoin/bitcoin.dart';
+import 'package:cake_wallet/ethereum/ethereum.dart';
 import 'package:cake_wallet/view_model/restore/restore_mode.dart';
 import 'package:cake_wallet/view_model/restore/restore_wallet.dart';
 import 'package:hive/hive.dart';
@@ -80,6 +81,9 @@ abstract class WalletRestorationFromQRVMBase extends WalletCreationVM with Store
           case WalletType.litecoin:
             return bitcoin!.createBitcoinRestoreWalletFromSeedCredentials(
                 name: name, mnemonic: restoreWallet.mnemonicSeed ?? '', password: password);
+          case WalletType.ethereum:
+            return ethereum!.createEthereumRestoreWalletFromSeedCredentials(
+                name: name, mnemonic: restoreWallet.mnemonicSeed ?? '', password: password);
           default:
             throw Exception('Unexpected type: ${type.toString()}');
         }