feat: integrate stellar wallet (#1497)

Co-authored-by: Kirill Bubochkin <[email protected]>

packages/espressocash_app/ios/Podfile.lock

@@ -296,7 +296,7 @@ SPEC CHECKSUMS:
   FirebaseSharedSwift: 76e1529c32101d80e4f1ca2fba7c39d59f0a390a
   Flutter: e0871f40cf51350855a761d2e70bf5af5b9b5de7
   flutter_inappwebview_ios: 97215cf7d4677db55df76782dbd2930c5e1c1ea0
-  flutter_native_splash: edf599c81f74d093a4daf8e17bd7a018854bc778
+  flutter_native_splash: 52501b97d1c0a5f898d687f1646226c1f93c56ef
   flutter_secure_storage: 23fc622d89d073675f2eaa109381aefbcf5a49be
   GoogleDataTransport: 6c09b596d841063d76d4288cc2d2f42cc36e1e2a
   GoogleMLKit: 97ac7af399057e99182ee8edfa8249e3226a4065

packages/espressocash_app/lib/features/sign_in/services/sign_in_bloc.dart

@@ -1,7 +1,6 @@
 import 'package:bip39/bip39.dart' as bip39;
 import 'package:bloc_concurrency/bloc_concurrency.dart';
 import 'package:dfunc/dfunc.dart';
-
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart';

packages/espressocash_app/lib/features/stellar/constants.dart

@@ -0,0 +1,28 @@
+import 'package:stellar_flutter_sdk/stellar_flutter_sdk.dart';
+
+const _isStellarProd =
+    bool.fromEnvironment('STELLAR_PROD', defaultValue: false);
+
+final stellarNetwork = _isStellarProd ? Network.PUBLIC : Network.TESTNET;
+final stellarSdk = _isStellarProd ? StellarSDK.PUBLIC : StellarSDK.TESTNET;
+
+const _devBaseUrl = 'https://extstellar.moneygram.com/stellaradapterservice';
+const _prodBaseUrl = 'https://stellar.moneygram.com/stellaradapterservice';
+const moneygramBaseUrl = _isStellarProd ? _prodBaseUrl : _devBaseUrl;
+
+const _devSigningKey =
+    'GCSESAP5ILVM6CWIEGK2SDOCQU7PHVFYYT7JNKRDAQNVQWKD5YEE5ZJ4';
+const _prodSigningKey =
+    'GD5NUMEX7LYHXGXCAD4PGW7JDMOUY2DKRGY5XZHJS5IONVHDKCJYGVCL';
+const moneygramSigningKey = _isStellarProd ? _prodSigningKey : _devSigningKey;
+
+const _devAssetIssuer =
+    'GBBD47IF6LWK7P7MDEVSCWR7DPUWV3NY3DTQEVFL4NAT4AQH3ZLLFLA5';
+const _prodAssetIssuer =
+    'GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN';
+const moneygramAssetIssuer =
+    _isStellarProd ? _prodAssetIssuer : _devAssetIssuer;
+
+const _devAuthDomain = 'stellar-dev.espressocash.com';
+const _prodAuthDomain = 'espressocash.com';
+const espressoClientDomain = _isStellarProd ? _prodAuthDomain : _devAuthDomain;

packages/espressocash_app/lib/features/stellar/models/stellar_wallet.dart

@@ -0,0 +1,19 @@
+import 'dart:typed_data';
+
+import 'package:stellar_flutter_sdk/stellar_flutter_sdk.dart';
+
+Future<StellarWallet> createStellarWallet({required String mnemonic}) async {
+  final wallet = await Wallet.from(mnemonic);
+
+  return StellarWallet(await wallet.getKeyPair());
+}
+
+class StellarWallet {
+  const StellarWallet(this.keyPair);
+
+  final KeyPair keyPair;
+
+  String get address => keyPair.accountId;
+
+  Uint8List sign(Uint8List payload) => keyPair.sign(payload);
+}

packages/espressocash_app/lib/features/stellar/service/stellar_client.dart

@@ -0,0 +1,24 @@
+import 'package:stellar_flutter_sdk/stellar_flutter_sdk.dart';
+
+class StellarClient {
+  const StellarClient(this._sdk);
+
+  final StellarSDK _sdk;
+
+  Future<double> getXlmBalance(String accountId) async {
+    try {
+      final account = await _sdk.accounts.account(accountId);
+      final nativeAsset = AssetTypeNative();
+
+      for (final balance in account.balances) {
+        if (balance.assetType == nativeAsset.type) {
+          return double.parse(balance.balance);
+        }
+      }
+    } on Exception {
+      return 0.0;
+    }
+
+    return 0.0;
+  }
+}

packages/espressocash_app/lib/features/stellar/stellar_module.dart

@@ -0,0 +1,23 @@
+import 'package:injectable/injectable.dart';
+
+import '../accounts/auth_scope.dart';
+import '../accounts/data/account_repository.dart';
+import 'constants.dart';
+import 'models/stellar_wallet.dart';
+import 'service/stellar_client.dart';
+
+@module
+abstract class StellarModule {
+  const StellarModule();
+
+  @Singleton(scope: authScope)
+  @preResolve
+  Future<StellarWallet> wallet(AccountRepository repository) async {
+    final mnemonic = await repository.loadMnemonic();
+
+    return createStellarWallet(mnemonic: mnemonic);
+  }
+
+  @LazySingleton(scope: authScope)
+  StellarClient stellarClient() => StellarClient(stellarSdk);
+}

packages/espressocash_app/pubspec.lock

@@ -707,10 +707,10 @@ packages:
     dependency: "direct dev"
     description:
       name: flutter_native_splash
-      sha256: edf39bcf4d74aca1eb2c1e43c3e445fd9f494013df7f0da752fefe72020eedc0
+      sha256: "17d9671396fb8ec45ad10f4a975eb8a0f70bedf0fdaf0720b31ea9de6da8c4da"
       url: "https://pub.dev"
     source: hosted
-    version: "2.4.0"
+    version: "2.3.7"
   flutter_plugin_android_lifecycle:
     dependency: transitive
     description:
@@ -1342,10 +1342,10 @@ packages:
     dependency: transitive
     description:
       name: petitparser
-      sha256: c15605cd28af66339f8eb6fbe0e541bfe2d1b72d5825efc6598f3e0a31b9ad27
+      sha256: cb3798bef7fc021ac45b308f4b51208a152792445cce0448c9a4ba5879dd8750
       url: "https://pub.dev"
     source: hosted
-    version: "6.0.2"
+    version: "5.4.0"
   pinenacl:
     dependency: transitive
     description:
@@ -1749,6 +1749,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.11.1"
+  stellar_flutter_sdk:
+    dependency: "direct main"
+    description:
+      name: stellar_flutter_sdk
+      sha256: "7d505963fe11d0f90b3f798964c485ed9fa64731c38f14c9b2fb76d5d5bd6cd8"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.8.1"
   storybook_flutter:
     dependency: "direct main"
     description:
@@ -1845,6 +1853,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.1"
+  toml:
+    dependency: transitive
+    description:
+      name: toml
+      sha256: "69756bc12eccf279b72217a87310d217efc4b3752f722e890f672801f19ac485"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.13.1"
   tuple:
     dependency: transitive
     description:
@@ -1893,6 +1909,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.2.2"
+  unorm_dart:
+    dependency: transitive
+    description:
+      name: unorm_dart
+      sha256: "5b35bff83fce4d76467641438f9e867dc9bcfdb8c1694854f230579d68cd8f4b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.0"
   url_launcher:
     dependency: "direct main"
     description:
@@ -2065,10 +2089,10 @@ packages:
     dependency: transitive
     description:
       name: xml
-      sha256: b015a8ad1c488f66851d762d3090a21c600e479dc75e68328c52774040cf9226
+      sha256: "5bc72e1e45e941d825fd7468b9b4cc3b9327942649aeb6fc5cdbf135f0a86e84"
       url: "https://pub.dev"
     source: hosted
-    version: "6.5.0"
+    version: "6.3.0"
   yaml:
     dependency: transitive
     description:

packages/espressocash_app/pubspec.yaml

@@ -72,6 +72,7 @@ dependencies:
   solana_mobile_wallet:
     path: ../solana_mobile_wallet/
   sqlite3_flutter_libs: ^0.5.18
+  stellar_flutter_sdk: ^1.8.0
   storybook_flutter: ^0.14.0
   uni_links: ^0.5.1
   url_launcher: ^6.2.2
@@ -84,7 +85,7 @@ dev_dependencies:
   flutter_driver:
     sdk: flutter
   flutter_gen_runner: ^5.4.0
-  flutter_native_splash: ^2.3.8
+  flutter_native_splash: ^2.3.7
   flutter_test:
     sdk: flutter
   freezed: ^2.4.6