lib/main/adapter/gateway/installation_file_storage.dart

@@ -4,4 +4,6 @@ abstract interface class InstallationFileStorage {
   Future<void> saveFile(Uint8List fileBytes, String path);
 
   Future<void> writeFile(String path, String content);
+
+  Future<void> grantFileExecutePermission(String path);
 }

lib/main/adapter/gateway/installation_repository_impl.dart

@@ -16,4 +16,9 @@ class InstallationRepositoryImpl implements InstallationRepository {
 
   @override
   Future<void> writeFile(String path, String content) => _fileStorage.writeFile(path, content);
+
+  @override
+  Future<void> grantFileExecutePermission(String path) {
+    return _fileStorage.grantFileExecutePermission(path);
+  }
 }

lib/main/adapter/presentation/installation_bloc.dart

@@ -1,7 +1,10 @@
+import 'dart:io';
+
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/installation_state.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/progress_view_model.dart';
 import 'package:minecraft_server_installer/main/application/use_case/download_file_use_case.dart';
+import 'package:minecraft_server_installer/main/application/use_case/grant_file_permission_use_case.dart';
 import 'package:minecraft_server_installer/main/application/use_case/write_file_use_case.dart';
 import 'package:minecraft_server_installer/main/constants.dart';
 import 'package:minecraft_server_installer/vanilla/adapter/presentation/game_version_view_model.dart';
@@ -11,6 +14,7 @@ class InstallationBloc extends Bloc<InstallationEvent, InstallationState> {
   InstallationBloc(
     DownloadFileUseCase downloadFileUseCase,
     WriteFileUseCase writeFileUseCase,
+    GrantFilePermissionUseCase grantFilePermissionUseCase,
   ) : super(const InstallationState.empty()) {
     on<InstallationStartedEvent>((_, emit) async {
       if (!state.canStartToInstall) {
@@ -28,10 +32,12 @@ class InstallationBloc extends Bloc<InstallationEvent, InstallationState> {
         onProgressChanged: (progressValue) => add(_InstallationProgressValueChangedEvent(progressValue)),
       );
 
-      await writeFileUseCase(
+      final startScriptFilePath = path.join(savePath, Constants.startScriptFileName);
-        path.join(savePath, Constants.startScriptFileName),
+      final startScriptContent = Platform.isWindows
-        'java -jar ${Constants.serverFileName}\n',
+          ? 'java -jar .\\${Constants.serverFileName}\r\n'
-      );
+          : 'java -jar ./${Constants.serverFileName}\n';
+      await writeFileUseCase(startScriptFilePath, startScriptContent);
+      await grantFilePermissionUseCase(startScriptFilePath);
 
       emit(state.copyWith(isLocked: false, downloadProgress: const ProgressViewModel.complete()));
     });

lib/main/application/repository/installation_repository.dart

@@ -4,4 +4,6 @@ abstract interface class InstallationRepository {
   Future<void> downloadFile(Uri url, String path, {DownloadProgressCallback? onProgressChanged});
 
   Future<void> writeFile(String path, String content);
+
+  Future<void> grantFileExecutePermission(String path);
 }

lib/main/application/use_case/grant_file_permission_use_case.dart

@@ -0,0 +1,9 @@
+import 'package:minecraft_server_installer/main/application/repository/installation_repository.dart';
+
+class GrantFilePermissionUseCase {
+  final InstallationRepository _installationRepository;
+
+  GrantFilePermissionUseCase(this._installationRepository);
+
+  Future<void> call(String path) => _installationRepository.grantFileExecutePermission(path);
+}

lib/main/framework/storage/installation_file_storage_impl.dart

@@ -17,4 +17,16 @@ class InstallationFileStorageImpl implements InstallationFileStorage {
     await file.create(recursive: true, exclusive: false);
     await file.writeAsString(content, flush: true);
   }
+
+  @override
+  Future<void> grantFileExecutePermission(String path) async {
+    File file = File(path);
+    await file.create(recursive: true, exclusive: false);
+
+    if (Platform.isWindows) {
+      await Process.run('icacls', [path, '/grant', '%USERNAME%:(RX)']);
+    } else {
+      await Process.run('chmod', ['+x', path]);
+    }
+  }
 }

lib/main/framework/ui/minecraft_server_installer.dart

@@ -4,6 +4,7 @@ import 'package:minecraft_server_installer/main/adapter/gateway/installation_rep
 import 'package:minecraft_server_installer/main/adapter/presentation/installation_bloc.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/installation_state.dart';
 import 'package:minecraft_server_installer/main/application/use_case/download_file_use_case.dart';
+import 'package:minecraft_server_installer/main/application/use_case/grant_file_permission_use_case.dart';
 import 'package:minecraft_server_installer/main/application/use_case/write_file_use_case.dart';
 import 'package:minecraft_server_installer/main/framework/api/installation_api_service_impl.dart';
 import 'package:minecraft_server_installer/main/framework/storage/installation_file_storage_impl.dart';
@@ -30,6 +31,7 @@ class MinecraftServerInstaller extends StatelessWidget {
 
     final downloadFileUseCase = DownloadFileUseCase(installationRepository);
     final writeFileUseCase = WriteFileUseCase(installationRepository);
+    final grantFilePermissionUseCase = GrantFilePermissionUseCase(installationRepository);
     final getGameVersionListUseCase = GetGameVersionListUseCase(gameVersionRepository);
 
     return MaterialApp(
@@ -37,7 +39,13 @@ class MinecraftServerInstaller extends StatelessWidget {
       theme: ThemeData.light().copyWith(colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue.shade900)),
       home: MultiBlocProvider(
         providers: [
-          BlocProvider(create: (_) => InstallationBloc(downloadFileUseCase, writeFileUseCase)),
+          BlocProvider(
+            create: (_) => InstallationBloc(
+              downloadFileUseCase,
+              writeFileUseCase,
+              grantFilePermissionUseCase,
+            ),
+          ),
           BlocProvider<VanillaBloc>(
             create: (_) => VanillaBloc(getGameVersionListUseCase)..add(VanillaGameVersionListLoadedEvent()),
           ),