Merge pull request #1189 from atsign-foundation/verify_atsign_onboarded

fix: Add "isOnboarded" method to verify if atSign is onboarded

packages/at_client_mobile/lib/at_client_mobile.dart

@@ -5,3 +5,5 @@ export 'src/at_client_service.dart';
 export 'src/keychain_manager.dart';
 export 'package:at_client/at_client.dart';
 export 'src/onboarding_status.dart';
+export 'src/auth/at_auth_service.dart';
+export 'src/auth/at_auth_service_impl.dart';

packages/at_client_mobile/lib/src/auth/at_auth_service.dart

@@ -0,0 +1,7 @@
+abstract class AtAuthService {
+  /// Checks whether the atSign has been onboarded.
+  /// Queries the keychain for the encryption public key.
+  /// If the key is found, the atSign is considered onboarded, and true is returned.
+  /// Otherwise, false is returned.
+  Future<bool> isOnboarded(String atSign);
+}

packages/at_client_mobile/lib/src/auth/at_auth_service_impl.dart

@@ -0,0 +1,32 @@
+import 'dart:async';
+
+import 'package:at_client_mobile/at_client_mobile.dart';
+import 'package:at_client_mobile/src/atsign_key.dart';
+
+class AtAuthServiceImpl implements AtAuthService {
+  AtServiceFactory? atServiceFactory;
+
+  // ignore: unused_field
+  final String _atSign;
+
+  // ignore: unused_field
+  final AtClientPreference _atClientPreference;
+
+  final KeyChainManager _keyChainManager = KeyChainManager.getInstance();
+  AtClientManager atClientManager = AtClientManager.getInstance();
+
+  AtAuthServiceImpl(this._atSign, this._atClientPreference);
+
+  @override
+  Future<bool> isOnboarded(String atSign) async {
+    AtsignKey? atsignKey = await _keyChainManager.readAtsign(name: atSign);
+    if (atsignKey == null) {
+      return false;
+    }
+    if (atsignKey.encryptionPublicKey == null ||
+        atsignKey.encryptionPublicKey!.isEmpty) {
+      return false;
+    }
+    return true;
+  }
+}