fix auth for user with no activity. (#191)

lib/blocs/auth/auth_bloc.dart

@@ -41,7 +41,12 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
     await _authRepository.loggedIn.then((bool loggedIn) async {
       if (loggedIn) {
         final String? username = await _authRepository.username;
-        final User user = await _storiesRepository.fetchUser(id: username!);
+        User? user = await _storiesRepository.fetchUser(id: username!);
+
+        /// According to Hacker News' API documentation,
+        /// if user has no public activity (posting a comment or story),
+        /// then it will not be available from the API.
+        user ??= User.emptyWithId(username);
 
         emit(
           state.copyWith(
@@ -84,10 +89,10 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
     );
 
     if (successful) {
-      final User user = await _storiesRepository.fetchUser(id: event.username);
+      final User? user = await _storiesRepository.fetchUser(id: event.username);
       emit(
         state.copyWith(
-          user: user,
+          user: user ?? User.emptyWithId(event.username),
           isLoggedIn: true,
           status: AuthStatus.loaded,
         ),

lib/cubits/user/user_cubit.dart

@@ -16,8 +16,13 @@ class UserCubit extends Cubit<UserState> {
 
   void init({required String userId}) {
     emit(state.copyWith(status: UserStatus.loading));
-    _storiesRepository.fetchUser(id: userId).then((User user) {
-      emit(state.copyWith(user: user, status: UserStatus.loaded));
+    _storiesRepository.fetchUser(id: userId).then((User? user) {
+      emit(
+        state.copyWith(
+          user: user ?? User.emptyWithId(userId),
+          status: UserStatus.loaded,
+        ),
+      );
     }).onError((_, __) {
       emit(state.copyWith(status: UserStatus.failure));
       return;

lib/models/user.dart

@@ -17,6 +17,12 @@ class User extends Equatable {
         id = '',
         karma = 0;
 
+  const User.emptyWithId(this.id)
+      : about = '',
+        created = 0,
+        delay = 0,
+        karma = 0;
+
   User.fromJson(Map<String, dynamic> json)
       : about = json['about'] as String? ?? '',
         created = json['created'] as int? ?? 0,

lib/repositories/stories_repository.dart

@@ -74,11 +74,14 @@ class StoriesRepository {
 
   /// Fetch a [User] by its [id].
   /// Hacker News uses user's username as [id].
-  Future<User> fetchUser({required String id}) async {
-    final User user = await _firebaseClient
+  Future<User?> fetchUser({required String id}) async {
+    final User? user = await _firebaseClient
         .get('${_baseUrl}user/$id.json')
         .then((dynamic val) {
-      final Map<String, dynamic> json = val as Map<String, dynamic>;
+      final Map<String, dynamic>? json = val as Map<String, dynamic>?;
+
+      if (json == null) return null;
+
       final User user = User.fromJson(json);
       return user;
     });

pubspec.yaml

@@ -1,6 +1,6 @@
 name: hacki
 description: A Hacker News reader.
-version: 1.4.0+104
+version: 1.4.1+105
 publish_to: none
 
 environment: