fix(authentication): handle and show login error state

Author: realth000

lib/features/authentication/bloc/authentication_bloc.dart

@@ -42,7 +42,7 @@ class AuthenticationBloc extends Bloc<AuthenticationEvent, AuthenticationState>
     emit(state.copyWith(status: AuthenticationStatus.loggingIn));
     await _authenticationRepository.loginWithPassword(userCredential).match((e) {
       handle(e);
-      emit(state.copyWith(status: AuthenticationStatus.failure));
+      emit(state.copyWith(status: AuthenticationStatus.failure, loginException: e));
     }, (_) => emit(state.copyWith(status: AuthenticationStatus.success))).run();
   }
 }

lib/features/authentication/repository/authentication_repository.dart

@@ -129,26 +129,46 @@ class AuthenticationRepository with LoggerMixin {
     if (resp.statusCode != HttpStatus.ok) {
       return left(HttpRequestFailedException(resp.statusCode));
     }
-    final loginResult = LoginResultMapper.fromJson(resp.data as String);
-    if (loginResult.status != 0) {
-      error('failed to login: $loginResult}');
-      return left(LoginOtherErrorException('login failed'));
-    }
 
-    // Here we get complete user info.
-    final userInfo = UserLoginInfo(username: loginResult.values!.username, uid: int.parse(loginResult.values!.uid!));
-    // First combine user info and cookie together.
-    await cookie.updateUserInfo(userInfo);
-    // Second, save credential in storage.
-    await cookie.saveCookieToStorage();
-    // Refresh the cookie in global cookie provider.
-    await getIt.get<CookieProvider>().loadCookieFromStorage(userInfo);
-    // Finally save authed user info and update authentication status to
-    // let auth stream subscribers update their status.
-    await _markAuthenticated(userInfo);
-    debug('end login with success');
+    return Option.tryCatch(() =>
+        LoginResultMapper.fromJson(resp.data as String)
+    ).match(() {
+      // Can not convert to regular login success result.
+      final json = jsonDecode(resp.data as String) as Map<String, dynamic>?;
+      final message = json?['message'] as String?;
+
+      if (message == null) {
+        return left(LoginOtherErrorException('message not found'));
+      }
+
+      final err = switch (message) {
+        'login_invalid' => LoginInvalidCredentialException(),
+        'login_strike' => LoginAttemptLimitException(),
+        'err_login_captcha_invalid' => LoginIncorrectCaptchaException(),
+        final String v => LoginOtherErrorException('unknown error message $v'),
+      };
+      return left(err);
+    }, (loginResult) async {
+      if (loginResult.status != 0) {
+        error('failed to login: $loginResult}');
+        return left(LoginOtherErrorException('login failed, status=${loginResult.status}'));
+      }
+
+      // Here we get complete user info.
+      final userInfo = UserLoginInfo(username: loginResult.values!.username, uid: int.parse(loginResult.values!.uid!));
+      // First combine user info and cookie together.
+      await cookie.updateUserInfo(userInfo);
+      // Second, save credential in storage.
+      await cookie.saveCookieToStorage();
+      // Refresh the cookie in global cookie provider.
+      await getIt.get<CookieProvider>().loadCookieFromStorage(userInfo);
+      // Finally save authed user info and update authentication status to
+      // let auth stream subscribers update their status.
+      await _markAuthenticated(userInfo);
+      debug('end login with success');
 
-    return rightVoid();
+      return rightVoid();
+    });
   });
 
   /// Parse logged user info from html [document].