Added JSON Schema validation

assets/schema.json

@@ -0,0 +1,81 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Schema for cabo game data",
+  "type": "array",
+  "items": {
+    "type": "object",
+    "properties": {
+      "gameTitle": {
+        "type": "string"
+      },
+      "gameHasPointLimit": {
+        "type": "boolean"
+      },
+      "players": {
+        "type": "array",
+        "items": {
+          "type": "string"
+        }
+      },
+      "playerScores": {
+        "type": "array",
+        "items": {
+          "type": "number"
+        }
+      },
+      "roundNumber": {
+        "type": "number"
+      },
+      "isGameFinished": {
+        "type": "boolean"
+      },
+      "winner": {
+        "type": "string"
+      },
+      "roundList": {
+        "type": "array",
+        "items": {
+          "type": "object",
+          "properties": {
+            "roundNum": {
+              "type": "number"
+            },
+            "caboPlayerIndex": {
+              "type": "number"
+            },
+            "kamikazePlayerIndex": {},
+            "scores": {
+              "type": "array",
+              "items": {
+                "type": "number"
+              }
+            },
+            "scoreUpdates": {
+              "type": "array",
+              "items": {
+                "type": "number"
+              }
+            }
+          },
+          "required": [
+            "roundNum",
+            "caboPlayerIndex",
+            "kamikazePlayerIndex",
+            "scores",
+            "scoreUpdates"
+          ]
+        }
+      }
+    },
+    "required": [
+      "gameTitle",
+      "gameHasPointLimit",
+      "players",
+      "playerScores",
+      "roundNumber",
+      "isGameFinished",
+      "winner",
+      "roundList"
+    ]
+  }
+}

lib/utility/local_storage_service.dart

@@ -1,11 +1,12 @@
 import 'dart:convert';
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:cabo_counter/data/game_session.dart';
 import 'package:cabo_counter/utility/globals.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:file_saver/file_saver.dart';
+import 'package:flutter/services.dart';
+import 'package:json_schema/json_schema.dart';
 import 'package:path_provider/path_provider.dart';
 
 class LocalStorageService {
@@ -38,31 +39,44 @@ class LocalStorageService {
   }
 
   /// Loads the game data from a local JSON file.
-  static Future<void> loadGameSessions() async {
+  static Future<bool> loadGameSessions() async {
     print('Versuche, Daten zu laden...');
     try {
       final file = await _getFilePath();
-      if (await file.exists()) {
+
+      if (!await file.exists()) {
+        print('Es existiert noch keine Datei mit Spieldaten');
+        return false;
+      }
+
       print('Es existiert bereits eine Datei mit Spieldaten');
       final jsonString = await file.readAsString();
-        if (jsonString.isNotEmpty) {
+
-          print('Die gefundene Datei ist nicht leer');
+      if (jsonString.isEmpty) {
+        print('Die gefundene Datei ist leer');
+        return false;
+      }
+
+      if (!await validateJsonSchema(jsonString)) {
+        print('Die Datei konnte nicht validiert werden');
+        Globals.gameList = [];
+        return false;
+      }
+
+      print('Die gefundene Datei ist nicht leer und validiert');
       final jsonList = json.decode(jsonString) as List<dynamic>;
+
       Globals.gameList = jsonList
           .map((jsonItem) =>
               GameSession.fromJson(jsonItem as Map<String, dynamic>))
-              .toList()
+          .toList();
-              .cast<GameSession>();
+
-          print('Die Daten wurden erfolgreich geladen');
+      print('Die Daten wurden erfolgreich geladen und verarbeitet');
-        } else {
+      return true;
-          print('Die Datei ist leer');
-        }
-      } else {
-        print('Es existiert bisher noch keine Datei mit Spieldaten');
-      }
     } catch (e) {
       print('Fehler beim Laden der Spieldaten:\n$e');
       Globals.gameList = [];
+      return false;
     }
   }
 
@@ -87,34 +101,63 @@ class LocalStorageService {
 
   /// Opens the file picker to import a JSON file and loads the game data from it.
   static Future<bool> importJsonFile() async {
-    try {
     final result = await FilePicker.platform.pickFiles(
       dialogTitle: 'Wähle eine Datei mit Spieldaten aus',
       type: FileType.custom,
       allowedExtensions: ['json'],
     );
-      String jsonString = '';
+
-      if (result != null) {
+    if (result == null) {
-        if (result.files.single.bytes != null) {
+      print('Der Dialog wurde abgebrochen');
-          final Uint8List fileBytes = result.files.single.bytes!;
+      return false;
-          jsonString = utf8.decode(fileBytes);
-        } else if (result.files.single.path != null) {
-          final file = File(result.files.single.path!);
-          jsonString = await file.readAsString();
     }
-        final jsonList = json.decode(jsonString) as List<dynamic>;
+
-        print('JSON Inhalt: $jsonList');
+    try {
-        Globals.gameList = jsonList
+      final jsonString = await _readFileContent(result.files.single);
+
+      if (!await validateJsonSchema(jsonString)) {
+        return false;
+      }
+      final jsonData = json.decode(jsonString) as List<dynamic>;
+      print('JSON Inhalt: $jsonData');
+      Globals.gameList = jsonData
           .map((jsonItem) =>
               GameSession.fromJson(jsonItem as Map<String, dynamic>))
           .toList();
       return true;
-      } else {
+    } on FormatException catch (e) {
-        print('Der Dialog wurde abgebrochen');
+      print('Ungültiges JSON-Format: $e');
+      return false;
+    } on Exception catch (e) {
+      print('Fehler beim Dateizugriff: $e');
+      return false;
+    }
+  }
+
+  /// Helper method to read file content from either bytes or path
+  static Future<String> _readFileContent(PlatformFile file) async {
+    if (file.bytes != null) return utf8.decode(file.bytes!);
+    if (file.path != null) return await File(file.path!).readAsString();
+
+    throw Exception('Die Datei hat keinen lesbaren Inhalt');
+  }
+
+  /// Validates the JSON data against the schema.
+  static Future<bool> validateJsonSchema(String jsonString) async {
+    try {
+      final schemaString = await rootBundle.loadString('assets/schema.json');
+      final schema = JsonSchema.create(json.decode(schemaString));
+      final jsonData = json.decode(jsonString);
+      final result = schema.validate(jsonData);
+
+      if (result.isValid) {
+        print('JSON ist erfolgreich validiert.');
         return true;
       }
+      print('JSON ist nicht gültig: ${result.errors}');
+      return false;
     } catch (e) {
-      print('Fehler beim Importieren: $e');
+      print('Fehler beim Validieren des JSON-Schemas: $e');
       return false;
     }
   }

pubspec.yaml

@@ -2,7 +2,7 @@ name: cabo_counter
 description: "Mobile app for the card game Cabo"
 publish_to: 'none'
 
-version: 0.1.5+113
+version: 0.1.5+116
 
 environment:
   sdk: ^3.5.4
@@ -19,6 +19,7 @@ dependencies:
   path_provider: ^2.1.1
   typed_data: ^1.3.2
   url_launcher: any
+  json_schema: ^5.2.1
 
 dev_dependencies:
   flutter_test: