implemented auth repository and service in dart (JWT)

backend-dart/lib/application/repository/in_memory_auth_repository_impl.dart

@@ -0,0 +1,81 @@
+import 'package:backend_dart/domain/errors/app_error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
+import 'package:backend_dart/domain/repository/auth_repository.dart';
+import 'package:dart_jsonwebtoken/dart_jsonwebtoken.dart';
+import 'package:fpdart/fpdart.dart';
+
+class InMemoryAuthRepositoryImpl implements AuthRepository {
+  final String secretKey;
+  final Map<String, String> sessionCache = {};
+  final Duration tokenExpiry;
+
+  InMemoryAuthRepositoryImpl({
+    required this.secretKey,
+    this.tokenExpiry = const Duration(hours: 24),
+  });
+
+  @override
+  TaskEither<IError, String> generateToken(String userId) {
+    return TaskEither.tryCatch(
+      () async {
+        final jwt = JWT({
+          'userId': userId,
+          'exp': DateTime.now().add(tokenExpiry).millisecondsSinceEpoch,
+        });
+        final token = jwt.sign(SecretKey(secretKey));
+
+        // Add to cache
+        sessionCache[token] = userId;
+
+        return token;
+      },
+      (error, _) =>
+          AppError.authenticationError(message: 'Failed to generate token'),
+    );
+  }
+
+  @override
+  TaskEither<IError, String> validateToken(String token) {
+    return TaskEither.tryCatch(
+      () async {
+        final jwt = JWT.verify(token, SecretKey(secretKey));
+
+        // Extract userId
+        final userId = jwt.payload['userId'] as String?;
+
+        if (userId == null) {
+          throw AppError.authenticationError(
+              message: 'Invalid token payload: userId not found');
+        }
+
+        // Check if the token exists in the cache
+        if (!sessionCache.containsKey(token)) {
+          throw AppError.authenticationError(
+              message: 'Token not found in cache');
+        }
+
+        return userId;
+      },
+      (error, _) => error is AppError
+          ? error
+          : AppError.authenticationError(message: 'Failed to validate token'),
+    );
+  }
+
+  @override
+  TaskEither<IError, void> revokeToken(String token) {
+    return TaskEither.tryCatch(
+      () async {
+        if (sessionCache.containsKey(token)) {
+          sessionCache.remove(token);
+          return;
+        } else {
+          throw AppError.authenticationError(message: 'Token not found');
+        }
+      },
+      (error, _) => error is AppError
+          ? error
+          : AppError.authenticationError(message: 'Failed to revoke token'),
+    );
+  }
+}

backend-dart/lib/application/repository/project_repository_impl.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/domain/data/database.dart';
 import 'package:backend_dart/domain/entities/project.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/domain/repository/project_repository.dart';
 import 'package:fpdart/fpdart.dart';
 

backend-dart/lib/application/repository/project_task_repository_impl.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/domain/data/database.dart';
 import 'package:backend_dart/domain/entities/project_task.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/domain/repository/project_task_repository.dart';
 import 'package:fpdart/fpdart.dart';
 

backend-dart/lib/application/repository/provider.dart

@@ -1,7 +1,9 @@
+import 'package:backend_dart/application/repository/in_memory_auth_repository_impl.dart';
 import 'package:backend_dart/application/repository/project_repository_impl.dart';
 import 'package:backend_dart/application/repository/project_task_repository_impl.dart';
 import 'package:backend_dart/application/repository/time_entry_repository_impl.dart';
 import 'package:backend_dart/application/repository/user_repository_impl.dart';
+import 'package:backend_dart/domain/repository/auth_repository.dart';
 import 'package:backend_dart/domain/repository/project_repository.dart';
 import 'package:backend_dart/domain/repository/project_task_repository.dart';
 import 'package:backend_dart/domain/repository/time_entry_repository.dart';
@@ -28,3 +30,7 @@ final timeEntryProvider = Provider<TimeEntryRepository>((ref) {
   final database = ref.read(databaseProvider);
   return TimeEntryRepositoryImpl(database);
 });
+
+final authProvider = Provider<AuthRepository>((ref) {
+  return InMemoryAuthRepositoryImpl(secretKey: "Secret");
+});

backend-dart/lib/application/repository/time_entry_repository_impl.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/domain/data/database.dart';
 import 'package:backend_dart/domain/entities/time_entry.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/domain/repository/time_entry_repository.dart';
 import 'package:fpdart/fpdart.dart';
 

backend-dart/lib/application/repository/user_repository_impl.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/domain/entities/user.dart';
 import 'package:backend_dart/domain/data/database.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/domain/repository/user_repository.dart';
 import 'package:fpdart/fpdart.dart';
 

backend-dart/lib/application/service/auth_service.dart

@@ -0,0 +1,77 @@
+import 'dart:convert';
+import 'package:backend_dart/application/service/dto/auth_dto.dart';
+import 'package:backend_dart/common/request_helper.dart';
+import 'package:backend_dart/common/response_helpers.dart';
+import 'package:backend_dart/common/secure_hash.dart';
+import 'package:backend_dart/common/validation.dart';
+import 'package:backend_dart/domain/entities/user.dart';
+import 'package:backend_dart/domain/errors/app_error.dart';
+import 'package:backend_dart/domain/repository/auth_repository.dart';
+import 'package:backend_dart/domain/repository/user_repository.dart';
+import 'package:fpdart/fpdart.dart';
+import 'package:shelf/shelf.dart';
+import 'package:shelf_router/shelf_router.dart';
+
+part 'auth_service.g.dart';
+
+class AuthService {
+  final AuthRepository authRepository;
+  final UserRepository users;
+
+  AuthService(this.authRepository, this.users);
+
+  /// Route to generate a token
+  @Route.post('/login')
+  Future<Response> generateToken(Request request) async {
+    return requestToJson(request)
+        .flatMap(validateJsonKeys(['email', 'password']))
+        .flatMap((json) => decodeJson(json, LoginRequestDTO.fromJson))
+        .flatMap<User>(
+          (loginRequest) => users.findByEmail(loginRequest.email).flatMap(
+                (user) => user.passwordHash ==
+                        generateSecureHash(loginRequest.password)
+                    ? TaskEither.right(user)
+                    : TaskEither.left(
+                        AppError.authenticationError(
+                            message: 'Invalid email or password'),
+                      ),
+              ),
+        )
+        .flatMap((user) => authRepository.generateToken(user.id).map((token) =>
+            TokenResponseDTO(token: token, userId: user.id).toJson()))
+        .map(jsonEncode)
+        .toResponse()
+        .run();
+  }
+
+  /// Route to validate a token
+  @Route.post('/validate')
+  Future<Response> validateToken(Request request) async {
+    return requestToJson(request)
+        .flatMap(validateJsonKeys(['token']))
+        .flatMap((json) => decodeJson(json, TokenRequestDTO.fromJson))
+        .map((tokenRequest) => tokenRequest.token)
+        .flatMap((token) => authRepository.validateToken(token).map((userId) =>
+            TokenResponseDTO(token: token, userId: userId).toJson()))
+        .map(jsonEncode)
+        .toResponse()
+        .run();
+  }
+
+  /// Route to revoke a token
+  @Route.post('/revoke')
+  Future<Response> revokeToken(Request request) async {
+    return requestToJson(request)
+        .flatMap(validateJsonKeys(['token']))
+        .flatMap((json) => decodeJson(json, TokenRequestDTO.fromJson))
+        .map((tokenRequest) => tokenRequest.token)
+        .flatMap(authRepository.revokeToken)
+        .map((_) => {'message': 'Token revoked successfully'})
+        .map(jsonEncode)
+        .toResponse()
+        .run();
+  }
+
+  /// Router for the AuthService
+  Router get router => _$AuthServiceRouter(this);
+}

backend-dart/lib/application/service/auth_service.g.dart

@@ -0,0 +1,27 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'auth_service.dart';
+
+// **************************************************************************
+// ShelfRouterGenerator
+// **************************************************************************
+
+Router _$AuthServiceRouter(AuthService service) {
+  final router = Router();
+  router.add(
+    'POST',
+    r'/login',
+    service.generateToken,
+  );
+  router.add(
+    'POST',
+    r'/validate',
+    service.validateToken,
+  );
+  router.add(
+    'POST',
+    r'/revoke',
+    service.revokeToken,
+  );
+  return router;
+}

backend-dart/lib/application/service/dto/auth_dto.dart

@@ -0,0 +1,42 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'auth_dto.freezed.dart';
+part 'auth_dto.g.dart';
+
+/// TokenResponseDTO represents the response for a token generation or validation.
+@freezed
+class TokenResponseDTO with _$TokenResponseDTO {
+  const factory TokenResponseDTO({
+    required String token,
+    required String userId,
+  }) = _TokenResponseDTO;
+
+  /// JSON serialization
+  factory TokenResponseDTO.fromJson(Map<String, dynamic> json) =>
+      _$TokenResponseDTOFromJson(json);
+}
+
+/// TokenRequestDTO represents a request for operations involving tokens.
+@freezed
+class TokenRequestDTO with _$TokenRequestDTO {
+  const factory TokenRequestDTO({
+    required String token,
+  }) = _TokenRequestDTO;
+
+  /// JSON serialization
+  factory TokenRequestDTO.fromJson(Map<String, dynamic> json) =>
+      _$TokenRequestDTOFromJson(json);
+}
+
+/// LoginRequestDTO represents the login request.
+@freezed
+class LoginRequestDTO with _$LoginRequestDTO {
+  const factory LoginRequestDTO({
+    required String email,
+    required String password,
+  }) = _LoginRequestDTO;
+
+  /// JSON serialization
+  factory LoginRequestDTO.fromJson(Map<String, dynamic> json) =>
+      _$LoginRequestDTOFromJson(json);
+}

backend-dart/lib/application/service/dto/auth_dto.freezed.dart

@@ -0,0 +1,503 @@
+// coverage:ignore-file
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
+
+part of 'auth_dto.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+T _$identity<T>(T value) => value;
+
+final _privateConstructorUsedError = UnsupportedError(
+    'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#adding-getters-and-methods-to-our-models');
+
+TokenResponseDTO _$TokenResponseDTOFromJson(Map<String, dynamic> json) {
+  return _TokenResponseDTO.fromJson(json);
+}
+
+/// @nodoc
+mixin _$TokenResponseDTO {
+  String get token => throw _privateConstructorUsedError;
+  String get userId => throw _privateConstructorUsedError;
+
+  /// Serializes this TokenResponseDTO to a JSON map.
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+
+  /// Create a copy of TokenResponseDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $TokenResponseDTOCopyWith<TokenResponseDTO> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $TokenResponseDTOCopyWith<$Res> {
+  factory $TokenResponseDTOCopyWith(
+          TokenResponseDTO value, $Res Function(TokenResponseDTO) then) =
+      _$TokenResponseDTOCopyWithImpl<$Res, TokenResponseDTO>;
+  @useResult
+  $Res call({String token, String userId});
+}
+
+/// @nodoc
+class _$TokenResponseDTOCopyWithImpl<$Res, $Val extends TokenResponseDTO>
+    implements $TokenResponseDTOCopyWith<$Res> {
+  _$TokenResponseDTOCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of TokenResponseDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? token = null,
+    Object? userId = null,
+  }) {
+    return _then(_value.copyWith(
+      token: null == token
+          ? _value.token
+          : token // ignore: cast_nullable_to_non_nullable
+              as String,
+      userId: null == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$TokenResponseDTOImplCopyWith<$Res>
+    implements $TokenResponseDTOCopyWith<$Res> {
+  factory _$$TokenResponseDTOImplCopyWith(_$TokenResponseDTOImpl value,
+          $Res Function(_$TokenResponseDTOImpl) then) =
+      __$$TokenResponseDTOImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({String token, String userId});
+}
+
+/// @nodoc
+class __$$TokenResponseDTOImplCopyWithImpl<$Res>
+    extends _$TokenResponseDTOCopyWithImpl<$Res, _$TokenResponseDTOImpl>
+    implements _$$TokenResponseDTOImplCopyWith<$Res> {
+  __$$TokenResponseDTOImplCopyWithImpl(_$TokenResponseDTOImpl _value,
+      $Res Function(_$TokenResponseDTOImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of TokenResponseDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? token = null,
+    Object? userId = null,
+  }) {
+    return _then(_$TokenResponseDTOImpl(
+      token: null == token
+          ? _value.token
+          : token // ignore: cast_nullable_to_non_nullable
+              as String,
+      userId: null == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String,
+    ));
+  }
+}
+
+/// @nodoc
+@JsonSerializable()
+class _$TokenResponseDTOImpl implements _TokenResponseDTO {
+  const _$TokenResponseDTOImpl({required this.token, required this.userId});
+
+  factory _$TokenResponseDTOImpl.fromJson(Map<String, dynamic> json) =>
+      _$$TokenResponseDTOImplFromJson(json);
+
+  @override
+  final String token;
+  @override
+  final String userId;
+
+  @override
+  String toString() {
+    return 'TokenResponseDTO(token: $token, userId: $userId)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$TokenResponseDTOImpl &&
+            (identical(other.token, token) || other.token == token) &&
+            (identical(other.userId, userId) || other.userId == userId));
+  }
+
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  int get hashCode => Object.hash(runtimeType, token, userId);
+
+  /// Create a copy of TokenResponseDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$TokenResponseDTOImplCopyWith<_$TokenResponseDTOImpl> get copyWith =>
+      __$$TokenResponseDTOImplCopyWithImpl<_$TokenResponseDTOImpl>(
+          this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$TokenResponseDTOImplToJson(
+      this,
+    );
+  }
+}
+
+abstract class _TokenResponseDTO implements TokenResponseDTO {
+  const factory _TokenResponseDTO(
+      {required final String token,
+      required final String userId}) = _$TokenResponseDTOImpl;
+
+  factory _TokenResponseDTO.fromJson(Map<String, dynamic> json) =
+      _$TokenResponseDTOImpl.fromJson;
+
+  @override
+  String get token;
+  @override
+  String get userId;
+
+  /// Create a copy of TokenResponseDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$TokenResponseDTOImplCopyWith<_$TokenResponseDTOImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+TokenRequestDTO _$TokenRequestDTOFromJson(Map<String, dynamic> json) {
+  return _TokenRequestDTO.fromJson(json);
+}
+
+/// @nodoc
+mixin _$TokenRequestDTO {
+  String get token => throw _privateConstructorUsedError;
+
+  /// Serializes this TokenRequestDTO to a JSON map.
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+
+  /// Create a copy of TokenRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $TokenRequestDTOCopyWith<TokenRequestDTO> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $TokenRequestDTOCopyWith<$Res> {
+  factory $TokenRequestDTOCopyWith(
+          TokenRequestDTO value, $Res Function(TokenRequestDTO) then) =
+      _$TokenRequestDTOCopyWithImpl<$Res, TokenRequestDTO>;
+  @useResult
+  $Res call({String token});
+}
+
+/// @nodoc
+class _$TokenRequestDTOCopyWithImpl<$Res, $Val extends TokenRequestDTO>
+    implements $TokenRequestDTOCopyWith<$Res> {
+  _$TokenRequestDTOCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of TokenRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? token = null,
+  }) {
+    return _then(_value.copyWith(
+      token: null == token
+          ? _value.token
+          : token // ignore: cast_nullable_to_non_nullable
+              as String,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$TokenRequestDTOImplCopyWith<$Res>
+    implements $TokenRequestDTOCopyWith<$Res> {
+  factory _$$TokenRequestDTOImplCopyWith(_$TokenRequestDTOImpl value,
+          $Res Function(_$TokenRequestDTOImpl) then) =
+      __$$TokenRequestDTOImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({String token});
+}
+
+/// @nodoc
+class __$$TokenRequestDTOImplCopyWithImpl<$Res>
+    extends _$TokenRequestDTOCopyWithImpl<$Res, _$TokenRequestDTOImpl>
+    implements _$$TokenRequestDTOImplCopyWith<$Res> {
+  __$$TokenRequestDTOImplCopyWithImpl(
+      _$TokenRequestDTOImpl _value, $Res Function(_$TokenRequestDTOImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of TokenRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? token = null,
+  }) {
+    return _then(_$TokenRequestDTOImpl(
+      token: null == token
+          ? _value.token
+          : token // ignore: cast_nullable_to_non_nullable
+              as String,
+    ));
+  }
+}
+
+/// @nodoc
+@JsonSerializable()
+class _$TokenRequestDTOImpl implements _TokenRequestDTO {
+  const _$TokenRequestDTOImpl({required this.token});
+
+  factory _$TokenRequestDTOImpl.fromJson(Map<String, dynamic> json) =>
+      _$$TokenRequestDTOImplFromJson(json);
+
+  @override
+  final String token;
+
+  @override
+  String toString() {
+    return 'TokenRequestDTO(token: $token)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$TokenRequestDTOImpl &&
+            (identical(other.token, token) || other.token == token));
+  }
+
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  int get hashCode => Object.hash(runtimeType, token);
+
+  /// Create a copy of TokenRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$TokenRequestDTOImplCopyWith<_$TokenRequestDTOImpl> get copyWith =>
+      __$$TokenRequestDTOImplCopyWithImpl<_$TokenRequestDTOImpl>(
+          this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$TokenRequestDTOImplToJson(
+      this,
+    );
+  }
+}
+
+abstract class _TokenRequestDTO implements TokenRequestDTO {
+  const factory _TokenRequestDTO({required final String token}) =
+      _$TokenRequestDTOImpl;
+
+  factory _TokenRequestDTO.fromJson(Map<String, dynamic> json) =
+      _$TokenRequestDTOImpl.fromJson;
+
+  @override
+  String get token;
+
+  /// Create a copy of TokenRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$TokenRequestDTOImplCopyWith<_$TokenRequestDTOImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+LoginRequestDTO _$LoginRequestDTOFromJson(Map<String, dynamic> json) {
+  return _LoginRequestDTO.fromJson(json);
+}
+
+/// @nodoc
+mixin _$LoginRequestDTO {
+  String get email => throw _privateConstructorUsedError;
+  String get password => throw _privateConstructorUsedError;
+
+  /// Serializes this LoginRequestDTO to a JSON map.
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+
+  /// Create a copy of LoginRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $LoginRequestDTOCopyWith<LoginRequestDTO> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $LoginRequestDTOCopyWith<$Res> {
+  factory $LoginRequestDTOCopyWith(
+          LoginRequestDTO value, $Res Function(LoginRequestDTO) then) =
+      _$LoginRequestDTOCopyWithImpl<$Res, LoginRequestDTO>;
+  @useResult
+  $Res call({String email, String password});
+}
+
+/// @nodoc
+class _$LoginRequestDTOCopyWithImpl<$Res, $Val extends LoginRequestDTO>
+    implements $LoginRequestDTOCopyWith<$Res> {
+  _$LoginRequestDTOCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of LoginRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? email = null,
+    Object? password = null,
+  }) {
+    return _then(_value.copyWith(
+      email: null == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String,
+      password: null == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$LoginRequestDTOImplCopyWith<$Res>
+    implements $LoginRequestDTOCopyWith<$Res> {
+  factory _$$LoginRequestDTOImplCopyWith(_$LoginRequestDTOImpl value,
+          $Res Function(_$LoginRequestDTOImpl) then) =
+      __$$LoginRequestDTOImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({String email, String password});
+}
+
+/// @nodoc
+class __$$LoginRequestDTOImplCopyWithImpl<$Res>
+    extends _$LoginRequestDTOCopyWithImpl<$Res, _$LoginRequestDTOImpl>
+    implements _$$LoginRequestDTOImplCopyWith<$Res> {
+  __$$LoginRequestDTOImplCopyWithImpl(
+      _$LoginRequestDTOImpl _value, $Res Function(_$LoginRequestDTOImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of LoginRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? email = null,
+    Object? password = null,
+  }) {
+    return _then(_$LoginRequestDTOImpl(
+      email: null == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String,
+      password: null == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+    ));
+  }
+}
+
+/// @nodoc
+@JsonSerializable()
+class _$LoginRequestDTOImpl implements _LoginRequestDTO {
+  const _$LoginRequestDTOImpl({required this.email, required this.password});
+
+  factory _$LoginRequestDTOImpl.fromJson(Map<String, dynamic> json) =>
+      _$$LoginRequestDTOImplFromJson(json);
+
+  @override
+  final String email;
+  @override
+  final String password;
+
+  @override
+  String toString() {
+    return 'LoginRequestDTO(email: $email, password: $password)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$LoginRequestDTOImpl &&
+            (identical(other.email, email) || other.email == email) &&
+            (identical(other.password, password) ||
+                other.password == password));
+  }
+
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  int get hashCode => Object.hash(runtimeType, email, password);
+
+  /// Create a copy of LoginRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$LoginRequestDTOImplCopyWith<_$LoginRequestDTOImpl> get copyWith =>
+      __$$LoginRequestDTOImplCopyWithImpl<_$LoginRequestDTOImpl>(
+          this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$LoginRequestDTOImplToJson(
+      this,
+    );
+  }
+}
+
+abstract class _LoginRequestDTO implements LoginRequestDTO {
+  const factory _LoginRequestDTO(
+      {required final String email,
+      required final String password}) = _$LoginRequestDTOImpl;
+
+  factory _LoginRequestDTO.fromJson(Map<String, dynamic> json) =
+      _$LoginRequestDTOImpl.fromJson;
+
+  @override
+  String get email;
+  @override
+  String get password;
+
+  /// Create a copy of LoginRequestDTO
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$LoginRequestDTOImplCopyWith<_$LoginRequestDTOImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}

backend-dart/lib/application/service/dto/auth_dto.g.dart

@@ -0,0 +1,47 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'auth_dto.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+_$TokenResponseDTOImpl _$$TokenResponseDTOImplFromJson(
+        Map<String, dynamic> json) =>
+    _$TokenResponseDTOImpl(
+      token: json['token'] as String,
+      userId: json['userId'] as String,
+    );
+
+Map<String, dynamic> _$$TokenResponseDTOImplToJson(
+        _$TokenResponseDTOImpl instance) =>
+    <String, dynamic>{
+      'token': instance.token,
+      'userId': instance.userId,
+    };
+
+_$TokenRequestDTOImpl _$$TokenRequestDTOImplFromJson(
+        Map<String, dynamic> json) =>
+    _$TokenRequestDTOImpl(
+      token: json['token'] as String,
+    );
+
+Map<String, dynamic> _$$TokenRequestDTOImplToJson(
+        _$TokenRequestDTOImpl instance) =>
+    <String, dynamic>{
+      'token': instance.token,
+    };
+
+_$LoginRequestDTOImpl _$$LoginRequestDTOImplFromJson(
+        Map<String, dynamic> json) =>
+    _$LoginRequestDTOImpl(
+      email: json['email'] as String,
+      password: json['password'] as String,
+    );
+
+Map<String, dynamic> _$$LoginRequestDTOImplToJson(
+        _$LoginRequestDTOImpl instance) =>
+    <String, dynamic>{
+      'email': instance.email,
+      'password': instance.password,
+    };

backend-dart/lib/application/service/mapper/project_dto_mapper.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/application/service/dto/project_dto.dart';
 import 'package:backend_dart/domain/entities/project.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 class ProjectDtoMapper {

backend-dart/lib/application/service/mapper/project_task_dto_mapper.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/application/service/dto/project_task_dto.dart';
 import 'package:backend_dart/domain/entities/project_task.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 class ProjectTaskDtoMapper {

backend-dart/lib/application/service/mapper/time_entry_dto_mapper.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/application/service/dto/time_entry_dto.dart';
 import 'package:backend_dart/domain/entities/time_entry.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 class TimeEntryDtoMapper {

backend-dart/lib/application/service/mapper/user_dto_mapper.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/application/service/dto/user_dto.dart';
 import 'package:backend_dart/domain/entities/user.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 class UserDtoMapper {

backend-dart/lib/application/service/service_provider.dart

@@ -1,4 +1,5 @@
 import 'package:backend_dart/application/repository/provider.dart';
+import 'package:backend_dart/application/service/auth_service.dart';
 import 'package:backend_dart/application/service/project_service.dart';
 import 'package:backend_dart/application/service/project_task_service.dart';
 import 'package:backend_dart/application/service/time_entry_service.dart';
@@ -24,3 +25,9 @@ final timeEntryServiceProvider = Provider<TimeEntryService>((ref) {
   final database = ref.read(timeEntryProvider);
   return TimeEntryService(database);
 });
+
+final authServiceProvider = Provider<AuthService>((ref) {
+  final authRepository = ref.read(authProvider);
+  final users = ref.read(userRepoProvider);
+  return AuthService(authRepository, users);
+});

backend-dart/lib/common/error_on_null.dart

@@ -1,4 +1,4 @@
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 TaskEither<IError, T> Function(T?) errorOnNull<T>(IError error) {

backend-dart/lib/common/request_helper.dart

@@ -2,7 +2,7 @@ import 'dart:convert';
 import 'dart:core';
 
 import 'package:backend_dart/domain/errors/app_error.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 import 'package:shelf/shelf.dart';
 

backend-dart/lib/common/response_helpers.dart

@@ -1,6 +1,6 @@
 import 'dart:convert';
 import 'package:backend_dart/domain/errors/error_code.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 import 'package:shelf/shelf.dart';
 

backend-dart/lib/domain/data/project_data_source.dart

@@ -1,5 +1,5 @@
 import 'package:backend_dart/domain/entities/project.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 /// Interface for managing project data interactions.

backend-dart/lib/domain/data/project_task_data_source.dart

@@ -1,5 +1,5 @@
 import 'package:backend_dart/domain/entities/project_task.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 /// Interface for managing task data interactions.

backend-dart/lib/domain/data/time_entry_data_source.dart

@@ -1,5 +1,5 @@
 import 'package:backend_dart/domain/entities/time_entry.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 /// Interface for managing time entry data interactions.

backend-dart/lib/domain/data/user_data_source.dart

@@ -1,5 +1,5 @@
 import 'package:backend_dart/domain/entities/user.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 abstract class UserDataSource {

backend-dart/lib/domain/errors/app_error.dart

@@ -1,4 +1,4 @@
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'error_code.dart';
 
@@ -48,4 +48,8 @@ class AppError with _$AppError implements IError {
   factory AppError.inputError({String? message}) {
     return AppError.fromErrorCode(ErrorCode.inputError, message: message);
   }
+
+  factory AppError.authenticationError({String? message}) {
+    return AppError.fromErrorCode(ErrorCode.authenticationError, message: message);
+  }
 }

backend-dart/lib/domain/errors/error_code.dart

@@ -3,6 +3,7 @@ enum ErrorCode {
   validationError, // Eingabevalidierungsfehler
   unexpectedError, // Unerwarteter Fehler
   authenticationError, // Authentifizierungsfehler
+  authorizationError, // Autorisierungsfehler
   permissionDenied, // Berechtigungsfehler
   notFound, // Ressource nicht gefunden
   exception, // Ausnahme

backend-dart/lib/domain/interface/mapper.dart

@@ -1,16 +0,0 @@
-import 'package:backend_dart/domain/interface/error.dart';
-import 'package:fpdart/fpdart.dart';
-
-abstract class IMapper<U, V> {
-  /// Konvertiert von Typ U (Origin) zu Typ V (Target)
-  TaskEither<IError, V> to(U origin);
-
-  /// Konvertiert von Typ V (Target) zu Typ U (Origin)
-  TaskEither<IError, U> from(V target);
-
-  /// Konvertiert eine Liste von Typ U (Origin) zu einer Liste von Typ V (Target)
-  TaskEither<IError, List<V>> listTo(Iterable<U> origins);
-
-  /// Konvertiert eine Liste von Typ V (Target) zu einer Liste von Typ U (Origin)
-  TaskEither<IError, List<U>> listFrom(Iterable<V> targets);
-}

backend-dart/lib/domain/repository/auth_repository.dart

@@ -0,0 +1,8 @@
+import 'package:backend_dart/domain/errors/error.dart';
+import 'package:fpdart/fpdart.dart';
+
+abstract class AuthRepository {
+  TaskEither<IError, String> generateToken(String userId);
+  TaskEither<IError, String> validateToken(String token);
+  TaskEither<IError, void> revokeToken(String token);
+}

backend-dart/lib/domain/repository/project_repository.dart

@@ -1,6 +1,6 @@
 import 'package:fpdart/fpdart.dart';
 import 'package:backend_dart/domain/entities/project.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 
 abstract class ProjectRepository {
   /// Creates a new project.

backend-dart/lib/domain/repository/project_task_repository.dart

@@ -1,6 +1,6 @@
 import 'package:fpdart/fpdart.dart';
 import 'package:backend_dart/domain/entities/project_task.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 
 abstract class ProjectTaskRepository {
   /// Creates a new project task.

backend-dart/lib/domain/repository/time_entry_repository.dart

@@ -1,6 +1,6 @@
 import 'package:fpdart/fpdart.dart';
 import 'package:backend_dart/domain/entities/time_entry.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 
 abstract class TimeEntryRepository {
   /// Creates a new time entry.

backend-dart/lib/domain/repository/user_repository.dart

@@ -1,5 +1,5 @@
 import 'package:backend_dart/domain/entities/user.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 abstract class UserRepository {

backend-dart/lib/infrastructure/persistence/mapper/project_dbo_mapper.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/common/extensions.dart';
 import 'package:backend_dart/domain/entities/project.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';
 import 'package:fpdart/fpdart.dart';

backend-dart/lib/infrastructure/persistence/mapper/project_task_dbo_mapper.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/common/extensions.dart';
 import 'package:backend_dart/domain/entities/project_task.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';
 import 'package:fpdart/fpdart.dart';

backend-dart/lib/infrastructure/persistence/mapper/time_entry_dbo_mapper.dart

@@ -1,6 +1,6 @@
 import 'package:backend_dart/common/extensions.dart';
 import 'package:backend_dart/domain/entities/time_entry.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';
 import 'package:fpdart/fpdart.dart';

backend-dart/lib/infrastructure/persistence/mapper/user_dbo_mapper.dart

@@ -1,7 +1,7 @@
 import 'package:backend_dart/common/extensions.dart';
 import 'package:backend_dart/common/secure_hash.dart';
 import 'package:backend_dart/domain/entities/user.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';
 import 'package:fpdart/fpdart.dart';

backend-dart/lib/infrastructure/persistence/prisma_project_data_source.dart

@@ -2,7 +2,7 @@ import 'package:backend_dart/common/error_on_null.dart';
 import 'package:backend_dart/domain/data/project_data_source.dart';
 import 'package:backend_dart/domain/entities/project.dart';
 import 'package:backend_dart/domain/errors/app_error.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/client.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';

backend-dart/lib/infrastructure/persistence/prisma_project_task_data_source.dart

@@ -2,7 +2,7 @@ import 'package:backend_dart/common/error_on_null.dart';
 import 'package:backend_dart/domain/data/project_task_data_source.dart';
 import 'package:backend_dart/domain/entities/project_task.dart';
 import 'package:backend_dart/domain/errors/app_error.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/client.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';

backend-dart/lib/infrastructure/persistence/prisma_time_entry_data_source.dart

@@ -2,7 +2,7 @@ import 'package:backend_dart/common/error_on_null.dart';
 import 'package:backend_dart/domain/data/time_entry_data_source.dart';
 import 'package:backend_dart/domain/entities/time_entry.dart';
 import 'package:backend_dart/domain/errors/app_error.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/client.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';

backend-dart/lib/infrastructure/persistence/prisma_user_data_source.dart

@@ -2,7 +2,7 @@ import 'package:backend_dart/common/error_on_null.dart';
 import 'package:backend_dart/domain/data/user_data_source.dart';
 import 'package:backend_dart/domain/entities/user.dart';
 import 'package:backend_dart/domain/errors/app_error.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/domain/errors/error.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
 import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';
 import 'package:backend_dart/infrastructure/persistence/mapper/user_dbo_mapper.dart';

backend-dart/lib/interfaces/http/router.dart

@@ -20,12 +20,14 @@ Router getRouter(ProviderContainer container) {
   final projectService = container.read(projectServiceProvider);
   final projectTaskService = container.read(projectTaskServiceProvider);
   final timeEntryService = container.read(timeEntryServiceProvider);
+  final authService = container.read(authServiceProvider);
 
   // UserService-Router
   router.mount('/api/users/', userService.router.call);
   router.mount('/api/projects/', projectService.router.call);
   router.mount('/api/project-tasks/', projectTaskService.router.call);
   router.mount('/api/time-entries/', timeEntryService.router.call);
+  router.mount('/api/auth/', authService.router.call);
 
   return router;
 }

backend-dart/pubspec.lock

@@ -14,6 +14,14 @@ packages:
     description: dart
     source: sdk
     version: "0.3.3"
+  adaptive_number:
+    dependency: transitive
+    description:
+      name: adaptive_number
+      sha256: "3a567544e9b5c9c803006f51140ad544aedc79604fd4f3f2c1380003f97c1d77"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   analyzer:
     dependency: transitive
     description:
@@ -238,6 +246,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0+6.11.0"
+  dart_jsonwebtoken:
+    dependency: "direct main"
+    description:
+      name: dart_jsonwebtoken
+      sha256: "866787dc17afaef46a9ea7dd33eefe60c6d82084b4a36d70e8e788d091cd04ef"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.14.2"
   dart_style:
     dependency: transitive
     description:
@@ -254,6 +270,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.2"
+  ed25519_edwards:
+    dependency: transitive
+    description:
+      name: ed25519_edwards
+      sha256: "6ce0112d131327ec6d42beede1e5dfd526069b18ad45dcf654f15074ad9276cd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.1"
   file:
     dependency: transitive
     description:
@@ -478,6 +502,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.1"
+  pointycastle:
+    dependency: transitive
+    description:
+      name: pointycastle
+      sha256: "4be0097fcf3fd3e8449e53730c631200ebc7b88016acecab2b0da2f0149222fe"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.9.1"
   pool:
     dependency: transitive
     description:

backend-dart/pubspec.yaml

@@ -22,6 +22,7 @@ dependencies:
   freezed_annotation: ^2.4.4
   uuid: ^4.5.1
   crypto: ^3.0.6
+  dart_jsonwebtoken: ^2.14.2
   
 dev_dependencies:
   lints: ^3.0.0

backend-go/cmd/actatempus/main.go

@@ -28,7 +28,7 @@ func main() {
 	projectRepo := repository.NewProjectRepository(database.Projects())
 	projectTaskRepo := repository.NewProjectTaskRepository(database.ProjectTasks())
 	timeEntryRepo := repository.NewTimeEntryRepository(database.TimeEntries())
-	authRepo := repository.NewInMemoryAuthRepository("secret")
+	authRepo := repository.NewInMemoryAuthRepositoryImpl("secret")
 
 	// Initialize services
 	userService := services.NewUserService(userRepo)

backend-go/internal/application/repository/in_memory_auth_repository_impl.go

@@ -19,7 +19,7 @@ type InMemoryAuthRepository struct {
 	mu           sync.RWMutex
 }
 
-func NewInMemoryAuthRepository(secretKey string) repository.AuthRepository {
+func NewInMemoryAuthRepositoryImpl(secretKey string) repository.AuthRepository {
 	return &InMemoryAuthRepository{
 		secretKey:    secretKey,
 		sessionCache: make(map[string]string),