From 1315a532120d49074526e06b4da9c24b21a910bf Mon Sep 17 00:00:00 2001
From: M <m@cakewallet.com>
Date: Wed, 8 Jan 2020 18:38:38 +0200
Subject: [PATCH] Replaced eu-node.cakewallet.io by xmr-node-eu.cakewallet.com
 and node.cakewallet.io by xmr-node-usa-east.cakewallet.com in remote nodes
 list. Added migration for change current remote node if user use old eu or
 usa remote node by new addresses. Changed way for set default remote node for
 initial setup by base on current user time zone.

---
 assets/node_list.yml                          |   8 +-
 lib/main.dart                                 |   3 +-
 .../common/default_settings_migration.dart    | 116 +++++++++++++++---
 lib/src/domain/common/node_list.dart          |  12 +-
 4 files changed, 109 insertions(+), 30 deletions(-)

diff --git a/assets/node_list.yml b/assets/node_list.yml
index 70c114f57..90c09e0b6 100644
--- a/assets/node_list.yml
+++ b/assets/node_list.yml
@@ -2,14 +2,10 @@
   uri: xmr-node-uk.cakewallet.com:18081
   is_default: true
 -
-  uri: eu-node.cakewallet.io:18081
-  login: cake
-  password: public_node
+  uri: xmr-node-eu.cakewallet.com:18081
   is_default: false
 -
-  uri: node.cakewallet.io:18081
-  login: cake
-  password: public_node
+  uri: xmr-node-usa-east.cakewallet.com:18081
   is_default: false
 -
   uri: node.moneroworld.com:18089
diff --git a/lib/main.dart b/lib/main.dart
index c97b83b20..2cf7e5911 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -80,7 +80,8 @@ void main() async {
       sharedPreferences: sharedPreferences,
       walletListService: walletListService,
       nodes: nodes,
-      authStore: authenticationStore);
+      authStore: authenticationStore,
+      initialMigrationVersion: 2);
 
   final settingsStore = await SettingsStoreBase.load(
       nodes: nodes,
diff --git a/lib/src/domain/common/default_settings_migration.dart b/lib/src/domain/common/default_settings_migration.dart
index 7a5e138a0..82d919248 100644
--- a/lib/src/domain/common/default_settings_migration.dart
+++ b/lib/src/domain/common/default_settings_migration.dart
@@ -19,28 +19,104 @@ Future defaultSettingsMigration(
     return;
   }
 
-  try {
-    switch (version) {
-      case 1:
-        await sharedPreferences.setString(
-            'current_fiat_currency', FiatCurrency.usd.toString());
-        await sharedPreferences.setInt(
-            'current_fee_priority', TransactionPriority.standart.raw);
-        await sharedPreferences.setInt('current_balance_display_mode',
-            BalanceDisplayMode.availableBalance.raw);
-        await sharedPreferences.setInt(
-            'current_default_settings_migration_version', 1);
-        await sharedPreferences.setBool('save_recipient_address', false);
-        await resetToDefault(nodes);
-        await sharedPreferences.setInt('current_node_id', 0);
-        break;
-      default:
-        break;
+  final migrationVersionsLength = version - currentVersion;
+  final migrationVersions = List<int>.generate(
+      migrationVersionsLength, (i) => currentVersion + (i + 1));
+
+  await Future.forEach(migrationVersions, (int version) async {
+    try {
+      switch (version) {
+        case 1:
+          await sharedPreferences.setString(
+              'current_fiat_currency', FiatCurrency.usd.toString());
+          await sharedPreferences.setInt(
+              'current_fee_priority', TransactionPriority.standart.raw);
+          await sharedPreferences.setInt('current_balance_display_mode',
+              BalanceDisplayMode.availableBalance.raw);
+          await sharedPreferences.setBool('save_recipient_address', false);
+          await resetToDefault(nodes);
+          await changeCurrentNodeToDefault(
+              sharedPreferences: sharedPreferences, nodes: nodes);
+
+          break;
+        case 2:
+          await replaceNodesMigration(nodes: nodes);
+          await replaceDefaultNode(
+              sharedPreferences: sharedPreferences, nodes: nodes);
+
+          break;
+        default:
+          break;
+      }
+
+      await sharedPreferences.setInt(
+          'current_default_settings_migration_version', version);
+    } catch (e) {
+      print('Migration error: ${e.toString()}');
     }
-  } catch (e) {
-    print('Migration error: ${e.toString()}');
-  }
+  });
 
   await sharedPreferences.setInt(
       'current_default_settings_migration_version', version);
 }
+
+Future<void> replaceNodesMigration({@required Box<Node> nodes}) async {
+  final replaceNodes = <String, Node>{
+    'eu-node.cakewallet.io:18081':
+        Node(uri: 'xmr-node-eu.cakewallet.com:18081'),
+    'node.cakewallet.io:18081':
+        Node(uri: 'xmr-node-usa-east.cakewallet.com:18081')
+  };
+
+  nodes.values.forEach((Node node) async {
+    final nodeToReplace = replaceNodes[node.uri];
+
+    if (nodeToReplace != null) {
+      node.uri = nodeToReplace.uri;
+      node.login = nodeToReplace.login;
+      node.password = nodeToReplace.password;
+      await node.save();
+    }
+  });
+}
+
+Future<void> changeCurrentNodeToDefault(
+    {@required SharedPreferences sharedPreferences,
+    @required Box<Node> nodes}) async {
+  final timeZone = DateTime.now().timeZoneOffset.inHours;
+  String nodeUri = '';
+
+  if (timeZone >= 1) { // Eurasia
+    nodeUri = 'xmr-node-eu.cakewallet.com:18081';
+  } else if (timeZone <= -4) { // America
+    nodeUri = 'xmr-node-usa-east.cakewallet.com:18081';
+  }
+
+  final node = nodes.values.firstWhere((Node node) => node.uri == nodeUri) ??
+      nodes.values.first;
+  final nodeId = node != null ? node.key as int : 0; // 0 - England
+
+  await sharedPreferences.setInt('current_node_id', nodeId);
+}
+
+Future<void> replaceDefaultNode(
+    {@required SharedPreferences sharedPreferences,
+    @required Box<Node> nodes}) async {
+  const nodesForReplace = <String>[
+    'xmr-node-uk.cakewallet.com:18081',
+    'eu-node.cakewallet.io:18081',
+    'node.cakewallet.io:18081'
+  ];
+  final currentNodeId = sharedPreferences.getInt('current_node_id');
+  final currentNode =
+      nodes.values.firstWhere((Node node) => node.key == currentNodeId);
+  final needToReplace =
+      currentNode == null ? true : nodesForReplace.contains(currentNode.uri);
+
+  if (!needToReplace) {
+    return;
+  }
+
+  await changeCurrentNodeToDefault(
+      sharedPreferences: sharedPreferences, nodes: nodes);
+}
diff --git a/lib/src/domain/common/node_list.dart b/lib/src/domain/common/node_list.dart
index 1ee860663..1c318a5fc 100644
--- a/lib/src/domain/common/node_list.dart
+++ b/lib/src/domain/common/node_list.dart
@@ -5,9 +5,15 @@ import 'package:cake_wallet/src/domain/common/node.dart';
 
 Future<List<Node>> loadDefaultNodes() async {
   final nodesRaw = await rootBundle.loadString('assets/node_list.yml');
-  final nodes = loadYaml(nodesRaw) as List<Map<dynamic, dynamic>>;
-  
-  return nodes.map((raw) => Node.fromMap(raw)).toList();
+  final nodes = loadYaml(nodesRaw) as YamlList;
+
+  return nodes.map((dynamic raw) {
+    if (raw is Map) {
+      return Node.fromMap(raw);
+    }
+
+    return null;
+  }).toList();
 }
 
 Future resetToDefault(Box<Node> nodeSource) async {