Init login feature add domain layer

lib/features/login/domain/usecases/authentication_user_interactor.dart

@@ -0,0 +1,27 @@
+import 'package:core/core.dart';
+import 'package:dartz/dartz.dart';
+import 'package:model/model.dart';
+import 'package:tmail_ui_user/features/login/domain/repository/authentication_repository.dart';
+import 'package:tmail_ui_user/features/login/domain/repository/credential_repository.dart';
+import 'package:tmail_ui_user/features/login/domain/state/authentication_user_state.dart';
+
+class AuthenticationInteractor {
+  final AuthenticationRepository authenticationRepository;
+  final CredentialRepository credentialRepository;
+
+  AuthenticationInteractor(this.authenticationRepository, this.credentialRepository);
+
+  Future<Either<Failure, Success>> execute(Uri baseUrl, UserName userName, Password password) async {
+    try {
+      final user = await authenticationRepository.authenticationUser(baseUrl, userName, password);
+      await Future.wait([
+        credentialRepository.saveBaseUrl(baseUrl),
+        credentialRepository.saveUserName(userName),
+        credentialRepository.savePassword(password)
+      ]);
+      return Right(AuthenticationUserViewState(user));
+    } catch (e) {
+      return Left(AuthenticationUserFailure(e));
+    }
+  }
+}

lib/features/login/domain/usecases/get_credential_interactor.dart

@@ -0,0 +1,31 @@
+import 'package:core/core.dart';
+import 'package:dartz/dartz.dart';
+import 'package:tmail_ui_user/features/login/domain/exceptions/authentication_exception.dart';
+import 'dart:core';
+
+import 'package:tmail_ui_user/features/login/domain/repository/credential_repository.dart';
+import 'package:tmail_ui_user/features/login/domain/extensions/uri_extension.dart';
+import 'package:tmail_ui_user/features/login/domain/state/get_credential_state.dart';
+
+class GetCredentialInteractor {
+  final CredentialRepository credentialRepository;
+
+  GetCredentialInteractor(this.credentialRepository);
+
+  Future<Either<Failure, Success>> execute() async {
+    try {
+      final baseUrl = await credentialRepository.getBaseUrl();
+      final userName = await credentialRepository.getUserName();
+      final password = await credentialRepository.getPassword();
+      if (isCredentialValid(baseUrl)) {
+        return Right(GetCredentialViewState(baseUrl, userName, password));
+      } else {
+        return Left(GetCredentialFailure(BadCredentials()));
+      }
+    } catch (exception) {
+      return Left(GetCredentialFailure(exception));
+    }
+  }
+
+  bool isCredentialValid(Uri baseUrl) => baseUrl.isBaseUrlValid();
+}