загрзука клиента и хэширование

docs/launcher_web_api_spec.md

@@ -0,0 +1,189 @@
+# Moonwell Launcher Web API Spec
+
+## Scope
+
+This document specifies the current launcher behavior for:
+
+- authentication against the Moonwell Web API
+- installation directory selection
+- local file scan and hash calculation
+- manifest-based synchronization
+- client launch from `Wow.exe`
+
+The launcher no longer uses S3/MinIO directly. All server interaction goes
+through the Web API.
+
+## Configuration
+
+The launcher API base URL is provided via:
+
+- `MOONWELL_API_BASE_URL`
+
+Current integration mode is compile-time:
+
+- `flutter run -d windows --dart-define=MOONWELL_API_BASE_URL=https://host`
+- `flutter build windows --dart-define=MOONWELL_API_BASE_URL=https://host`
+
+## API Flow
+
+The launcher uses these endpoints from `openapi.json`:
+
+1. `POST /api/launcher/login`
+2. `GET /api/launcher/manifest`
+3. `GET /api/launcher/download/{path}`
+
+Authentication sequence:
+
+1. User enters launcher credentials.
+2. Launcher requests a bearer token from `POST /api/launcher/login`.
+3. Launcher requests the manifest from `GET /api/launcher/manifest`.
+4. `LauncherSession` and `ClientManifest` are passed into the home screen.
+
+File download sequence:
+
+1. Launcher resolves files that are missing, stale, or changed.
+2. For each required file, launcher calls `GET /api/launcher/download/{path}` with bearer auth.
+3. API returns JSON with a temporary presigned `url` and `expires_in`.
+4. Launcher downloads the file directly from storage using the presigned URL.
+5. Download is written into `*.moonwell.part`.
+6. Downloaded file is verified against manifest `sha256`.
+7. Temporary file replaces the destination file only after successful verify.
+
+## Installation Directory Rules
+
+The user selects a single installation root directory.
+
+All paths in the manifest are treated as relative to that root.
+
+Path safety rules:
+
+- backslashes are normalized to `/`
+- leading `./` is removed
+- absolute paths are rejected
+- path traversal via `..` is rejected
+
+## Ignored Directories
+
+The launcher excludes these top-level directories from verification:
+
+- `Cache`
+- `Errors`
+- `Logs`
+- `Screenshots`
+- `WTF`
+
+Files under these directories:
+
+- are not included in local scan
+- do not participate in local `buildHash`
+- are not compared against server manifest
+
+## Local Scan
+
+For every non-ignored file in the installation directory, the launcher computes:
+
+- normalized relative path
+- file size in bytes
+- file `sha256`
+
+The result is stored as a `ClientInstallationSnapshot`.
+
+## Hash Cache
+
+To accelerate repeated scans, the launcher stores a local hash cache in:
+
+- `<install-root>/.moonwell_launcher/hash_cache.json`
+
+This metadata directory is excluded from verification.
+
+Each cache entry is keyed by normalized relative path and stores:
+
+- `size`
+- `modifiedMs`
+- `sha256`
+
+Cache reuse rule:
+
+- if `path`, `size`, and `modifiedMs` still match, the cached `sha256` is reused
+- otherwise `sha256` is recomputed and the cache entry is replaced
+
+The cache is an optimization only. The server remains the source of truth via
+the manifest comparison.
+
+## buildHash Algorithm
+
+`buildHash` is deterministic and calculated identically for local snapshot and
+remote manifest.
+
+For each file entry, the launcher builds a canonical string:
+
+`<normalized-path>:<size>:<sha256-lowercase>`
+
+Then:
+
+1. sort all canonical strings lexicographically
+2. join them with `\n`
+3. compute `sha256` of the resulting UTF-8 payload
+
+This means file ordering in the manifest does not affect `buildHash`.
+
+## Sync Algorithm
+
+The current sync flow is:
+
+1. Load manifest.
+2. Scan local installation.
+3. Compute local `buildHash`.
+4. Compare local files to manifest files by `path`, `size`, and `sha256`.
+5. Identify stale local files that are not present in the manifest.
+6. If local `buildHash` matches server `buildHash` and there are no stale files
+   and no mismatches, finish successfully.
+7. Delete stale local files outside ignored directories.
+8. Download changed and missing files.
+9. Verify every downloaded file by `sha256`.
+10. Re-scan the installation.
+11. Recompute local `buildHash`.
+12. Fail if final snapshot still differs from manifest.
+
+## Pause and Resume Semantics
+
+Pause is implemented as cooperative cancellation:
+
+- the current sync stream is cancelled
+- the next sync starts a fresh comparison from current disk state
+- already replaced files remain valid
+- partial `*.moonwell.part` files are removed before the next download attempt
+
+## Launch Behavior
+
+When the user presses `Play`:
+
+1. launcher resolves `<install-root>/Wow.exe`
+2. launcher clears `<install-root>/Cache`
+3. launcher starts `Wow.exe` with working directory set to installation root
+
+If `Wow.exe` is missing, launch fails with an error.
+
+## Error Behavior
+
+The launcher surfaces errors for:
+
+- invalid API configuration
+- authentication failure
+- manifest load failure
+- path traversal attempts
+- checksum mismatch after download
+- final verification mismatch after update
+- missing `Wow.exe`
+
+## Tested Invariants
+
+The automated tests cover:
+
+- deterministic `buildHash`
+- path normalization used by `buildHash`
+- exclusion of ignored directories during local scan
+- cache cleanup behavior
+- safe path resolution
+- sync flow with fully up-to-date client
+- sync flow with stale files and changed files

lib/config.dart

@@ -4,11 +4,14 @@ final class Config {
   );
   static const gameExecutableName = 'Wow.exe';
   static const cacheDirectoryName = 'Cache';
+  static const launcherMetadataDirectoryName = '.moonwell_launcher';
+  static const hashCacheFileName = 'hash_cache.json';
   static const ignoredVerificationDirectories = <String>{
     'cache',
     'errors',
     'logs',
     'screenshots',
     'wtf',
+    '.moonwell_launcher',
   };
 }

lib/features/launcher/application/client_sync_use_case.dart

@@ -349,6 +349,7 @@ class ClientSyncUseCase
         );
         final temporaryPath = '$destinationPath.moonwell.part';
 
+        await _installationService.ensureParentDirectoryExists(temporaryPath);
         await _installationService.deleteFileIfExists(temporaryPath);
 
         await _launcherApiClient.downloadFile(

lib/features/launcher/data/game_installation_service.dart

@@ -1,5 +1,7 @@
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
+import 'dart:isolate';
 
 import 'package:crypto/crypto.dart';
 import 'package:injectable/injectable.dart';
@@ -32,56 +34,118 @@ class GameInstallationService {
       return ClientInstallationSnapshot.fromFiles(const []);
     }
 
-    final pendingFiles = <_PendingFile>[];
+    final receivePort = ReceivePort();
-    await _collectFiles(
+    final errorPort = ReceivePort();
-      rootDirectory,
+    final exitPort = ReceivePort();
-      rootDirectory.path,
-      pendingFiles,
-      isCancelled: isCancelled,
-    );
-
-    pendingFiles.sort(
-      (left, right) => left.relativePath.compareTo(right.relativePath),
-    );
-
-    final totalBytes = pendingFiles.fold<int>(
-      0,
-      (sum, pendingFile) => sum + pendingFile.size,
-    );
-
     final files = <LocalClientFile>[];
-    var processedBytes = 0;
+    final completer = Completer<ClientInstallationSnapshot>();
-    var processedFiles = 0;
+    final hashCachePath = getHashCachePath(installationDir);
+    final cachedHashes = await loadHashCache(installationDir);
+    Isolate? isolate;
+    StreamSubscription<dynamic>? receiveSubscription;
+    StreamSubscription<dynamic>? errorSubscription;
+    StreamSubscription<dynamic>? exitSubscription;
+    Timer? cancellationTimer;
 
-    for (final pendingFile in pendingFiles) {
+    Future<void> cleanup({bool killIsolate = true}) async {
-      await _throwIfCancelled(isCancelled);
+      cancellationTimer?.cancel();
+      await receiveSubscription?.cancel();
+      await errorSubscription?.cancel();
+      await exitSubscription?.cancel();
+      receivePort.close();
+      errorPort.close();
+      exitPort.close();
+      if (killIsolate) {
+        isolate?.kill(priority: Isolate.immediate);
+      }
+    }
 
-      final sha256 = await computeSha256(pendingFile.file.path);
+    receiveSubscription = receivePort.listen((message) async {
-      processedBytes += pendingFile.size;
+      if (completer.isCompleted || message is! Map) {
-      processedFiles += 1;
+        return;
+      }
 
-      files.add(
+      final type = message['type'];
-        LocalClientFile(
+      if (type == 'progress') {
-          path: pendingFile.relativePath,
+        final file = LocalClientFile(
-          size: pendingFile.size,
+          path: message['path'] as String,
-          sha256: sha256,
+          size: (message['size'] as num).toInt(),
-        ),
+          sha256: message['sha256'] as String,
         );
+        files.add(file);
 
         onProgress?.call(
           DownloadProgress(
             speed: 0,
-          downloaded: processedBytes,
+            downloaded: (message['processedBytes'] as num).toInt(),
-          total: totalBytes,
+            total: (message['totalBytes'] as num).toInt(),
             eta: Duration.zero,
           ),
-        pendingFile.relativePath,
+          file.path,
-        processedFiles,
+          (message['processedFiles'] as num).toInt(),
-        pendingFiles.length,
+          (message['totalFiles'] as num).toInt(),
         );
+        return;
       }
 
-    return ClientInstallationSnapshot.fromFiles(files);
+      if (type == 'done') {
+        final snapshot = ClientInstallationSnapshot.fromFiles(files);
+        completer.complete(snapshot);
+        await cleanup(killIsolate: false);
+      }
+    });
+
+    errorSubscription = errorPort.listen((message) async {
+      if (completer.isCompleted) {
+        return;
+      }
+
+      completer.completeError(
+        LauncherSyncException('Failed to scan installation files.'),
+      );
+      await cleanup(killIsolate: false);
+    });
+
+    exitSubscription = exitPort.listen((_) async {
+      if (completer.isCompleted) {
+        return;
+      }
+
+      completer.completeError(
+        LauncherSyncException('Hash scan worker exited unexpectedly.'),
+      );
+      await cleanup(killIsolate: false);
+    });
+
+    isolate = await Isolate.spawn<Map<String, Object?>>(
+      _scanInstallationIsolateMain,
+      <String, Object?>{
+        'sendPort': receivePort.sendPort,
+        'installationDir': installationDir,
+        'hashCachePath': hashCachePath,
+        'cachedHashes': cachedHashes,
+        'ignoredDirectories': Config.ignoredVerificationDirectories.toList(),
+      },
+      onError: errorPort.sendPort,
+      onExit: exitPort.sendPort,
+    );
+
+    if (isCancelled != null) {
+      cancellationTimer = Timer.periodic(const Duration(milliseconds: 200), (
+        _,
+      ) async {
+        if (completer.isCompleted) {
+          return;
+        }
+
+        if (await isCancelled()) {
+          completer.completeError(const CancelledException());
+          await cleanup();
+        }
+      });
+    }
+
+    return completer.future;
   }
 
   Future<String> computeSha256(String filePath) async {
@@ -109,6 +173,10 @@ class GameInstallationService {
     }
   }
 
+  Future<void> ensureParentDirectoryExists(String filePath) {
+    return File(filePath).parent.create(recursive: true);
+  }
+
   Future<void> replaceFile({
     required String temporaryPath,
     required String destinationPath,
@@ -163,6 +231,17 @@ class GameInstallationService {
     return File(getExecutablePath(installationDir)).exists();
   }
 
+  String getLauncherMetadataDirectoryPath(String installationDir) {
+    return p.join(installationDir, Config.launcherMetadataDirectoryName);
+  }
+
+  String getHashCachePath(String installationDir) {
+    return p.join(
+      getLauncherMetadataDirectoryPath(installationDir),
+      Config.hashCacheFileName,
+    );
+  }
+
   String getExecutablePath(String installationDir) {
     return p.join(installationDir, Config.gameExecutableName);
   }
@@ -183,15 +262,125 @@ class GameInstallationService {
     return p.joinAll([installationDir, ...pathSegments]);
   }
 
-  Future<void> _collectFiles(
+  Future<Map<String, Object?>> loadHashCache(String installationDir) async {
+    final cacheFile = File(getHashCachePath(installationDir));
+    if (!await cacheFile.exists()) {
+      return const <String, Object?>{};
+    }
+
+    try {
+      final rawJson = await cacheFile.readAsString();
+      final decoded = jsonDecode(rawJson);
+      if (decoded is! Map) {
+        return const <String, Object?>{};
+      }
+
+      final entries = decoded['entries'];
+      if (entries is! Map) {
+        return const <String, Object?>{};
+      }
+
+      return entries.map((key, value) => MapEntry(key.toString(), value));
+    } catch (_) {
+      return const <String, Object?>{};
+    }
+  }
+}
+
+Future<void> _scanInstallationIsolateMain(Map<String, Object?> message) async {
+  final sendPort = message['sendPort'] as SendPort;
+  final installationDir = message['installationDir'] as String;
+  final hashCachePath = message['hashCachePath'] as String;
+  final cachedHashes = (message['cachedHashes'] as Map<Object?, Object?>).map(
+    (key, value) => MapEntry(key.toString(), value),
+  );
+  final ignoredDirectories = (message['ignoredDirectories'] as List<Object?>)
+      .whereType<String>()
+      .map((entry) => entry.toLowerCase())
+      .toSet();
+
+  final rootDirectory = Directory(installationDir);
+  if (!await rootDirectory.exists()) {
+    sendPort.send(<String, Object?>{'type': 'done'});
+    return;
+  }
+
+  final pendingFiles = <_SerializablePendingFile>[];
+  await _collectFilesInIsolate(
+    rootDirectory,
+    rootDirectory.path,
+    pendingFiles,
+    ignoredDirectories,
+  );
+
+  pendingFiles.sort(
+    (left, right) => left.relativePath.compareTo(right.relativePath),
+  );
+
+  final totalBytes = pendingFiles.fold<int>(
+    0,
+    (sum, pendingFile) => sum + pendingFile.size,
+  );
+  final updatedCacheEntries = <String, Map<String, Object?>>{};
+
+  var processedBytes = 0;
+  var processedFiles = 0;
+
+  for (final pendingFile in pendingFiles) {
+    final digest = await _resolveFileHash(pendingFile, cachedHashes);
+    processedBytes += pendingFile.size;
+    processedFiles += 1;
+    updatedCacheEntries[pendingFile.relativePath] = <String, Object?>{
+      'size': pendingFile.size,
+      'modifiedMs': pendingFile.modifiedMs,
+      'sha256': digest,
+    };
+
+    sendPort.send(<String, Object?>{
+      'type': 'progress',
+      'path': pendingFile.relativePath,
+      'size': pendingFile.size,
+      'sha256': digest,
+      'processedBytes': processedBytes,
+      'totalBytes': totalBytes,
+      'processedFiles': processedFiles,
+      'totalFiles': pendingFiles.length,
+    });
+  }
+
+  await _writeHashCache(hashCachePath, updatedCacheEntries);
+  sendPort.send(<String, Object?>{'type': 'done'});
+}
+
+Future<String> _resolveFileHash(
+  _SerializablePendingFile pendingFile,
+  Map<String, Object?> cachedHashes,
+) async {
+  final cachedEntry = cachedHashes[pendingFile.relativePath];
+  if (cachedEntry is Map) {
+    final cachedSize = (cachedEntry['size'] as num?)?.toInt();
+    final cachedModifiedMs = (cachedEntry['modifiedMs'] as num?)?.toInt();
+    final cachedSha256 = cachedEntry['sha256'] as String?;
+
+    if (cachedSize == pendingFile.size &&
+        cachedModifiedMs == pendingFile.modifiedMs &&
+        cachedSha256 != null &&
+        cachedSha256.isNotEmpty) {
+      return cachedSha256;
+    }
+  }
+
+  final digest = await sha256.bind(File(pendingFile.path).openRead()).first;
+  return digest.toString();
+}
+
+Future<void> _collectFilesInIsolate(
   Directory directory,
   String rootPath,
-    List<_PendingFile> pendingFiles, {
+  List<_SerializablePendingFile> pendingFiles,
-    FutureOr<bool> Function()? isCancelled,
+  Set<String> ignoredDirectories,
-  }) async {
+) async {
   await for (final entity in directory.list(followLinks: false)) {
-      await _throwIfCancelled(isCancelled);
-
     final relativePath = normalizeClientPath(
       p.relative(entity.path, from: rootPath),
     );
@@ -200,16 +389,18 @@ class GameInstallationService {
       continue;
     }
 
-      if (_isExcludedPath(relativePath)) {
+    final segments = p.posix.split(relativePath);
+    if (segments.isNotEmpty &&
+        ignoredDirectories.contains(segments.first.toLowerCase())) {
       continue;
     }
 
     if (entity is Directory) {
-        await _collectFiles(
+      await _collectFilesInIsolate(
         entity,
         rootPath,
         pendingFiles,
-          isCancelled: isCancelled,
+        ignoredDirectories,
       );
       continue;
     }
@@ -220,37 +411,46 @@ class GameInstallationService {
 
     final stat = await entity.stat();
     pendingFiles.add(
-        _PendingFile(file: entity, relativePath: relativePath, size: stat.size),
+      _SerializablePendingFile(
+        path: entity.path,
+        relativePath: relativePath,
+        size: stat.size,
+        modifiedMs: stat.modified.millisecondsSinceEpoch,
+      ),
     );
   }
 }
 
-  bool _isExcludedPath(String relativePath) {
+Future<void> _writeHashCache(
-    final segments = p.posix.split(normalizeClientPath(relativePath));
+  String hashCachePath,
-    if (segments.isEmpty) {
+  Map<String, Map<String, Object?>> entries,
-      return false;
+) async {
+  final cacheFile = File(hashCachePath);
+  await cacheFile.parent.create(recursive: true);
+
+  final tempFile = File('$hashCachePath.tmp');
+  final payload = jsonEncode(<String, Object?>{
+    'version': 1,
+    'entries': entries,
+  });
+
+  await tempFile.writeAsString(payload, flush: true);
+  if (await cacheFile.exists()) {
+    await cacheFile.delete();
+  }
+  await tempFile.rename(hashCachePath);
 }
 
-    return Config.ignoredVerificationDirectories.contains(
+final class _SerializablePendingFile {
-      segments.first.toLowerCase(),
+  final String path;
-    );
-  }
-
-  Future<void> _throwIfCancelled(FutureOr<bool> Function()? isCancelled) async {
-    if (isCancelled != null && await isCancelled()) {
-      throw const CancelledException();
-    }
-  }
-}
-
-final class _PendingFile {
-  final File file;
   final String relativePath;
   final int size;
+  final int modifiedMs;
 
-  const _PendingFile({
+  const _SerializablePendingFile({
-    required this.file,
+    required this.path,
     required this.relativePath,
     required this.size,
+    required this.modifiedMs,
   });
 }

lib/features/launcher/data/launcher_api_client.dart

@@ -61,10 +61,17 @@ class LauncherApiClient {
     required void Function(int chunkBytes) onChunkReceived,
   }) async {
     try {
-      final response = await _dio.getUri<ResponseBody>(
+      final downloadLinkResponse = await _dio.getUri(
         _resolveUri('api/launcher/download/${Uri.encodeComponent(file.path)}'),
-        options: _authorizedOptions(
+        options: _authorizedOptions(accessToken),
-          accessToken,
+      );
+      final downloadUri = _extractDownloadUri(
+        _coerceMap(downloadLinkResponse.data),
+      );
+
+      final response = await _dio.getUri<ResponseBody>(
+        downloadUri,
+        options: Options(
           responseType: ResponseType.stream,
           headers: const {HttpHeaders.acceptHeader: 'application/octet-stream'},
         ),
@@ -173,4 +180,22 @@ class LauncherApiClient {
 
     return error.message ?? 'Launcher API request failed.';
   }
+
+  Uri _extractDownloadUri(Map<String, dynamic> payload) {
+    final rawUrl = payload['url'];
+    if (rawUrl is! String || rawUrl.trim().isEmpty) {
+      throw const LauncherApiException(
+        'Launcher API did not return a valid download URL.',
+      );
+    }
+
+    final uri = Uri.tryParse(rawUrl);
+    if (uri == null || !uri.hasScheme || uri.host.isEmpty) {
+      throw const LauncherApiException(
+        'Launcher API returned an invalid presigned download URL.',
+      );
+    }
+
+    return uri;
+  }
 }

openapi.json

@@ -0,0 +1,299 @@
+{
+    "openapi": "3.0.0",
+    "info": {
+        "title": "Moonwell Launcher API",
+        "description": "API для лаунчера WoW-клиента Moonwell. Авторизация, получение манифеста файлов и скачивание обновлений.",
+        "version": "1.0.0"
+    },
+    "paths": {
+        "/api/launcher/login": {
+            "post": {
+                "tags": [
+                    "Launcher Auth"
+                ],
+                "summary": "Авторизация лаунчера",
+                "description": "Авторизация по логину и паролю игрового аккаунта. Возвращает Bearer-токен для доступа к API.",
+                "operationId": "8b934358769733a6925c1fbc8dc07705",
+                "requestBody": {
+                    "required": true,
+                    "content": {
+                        "application/json": {
+                            "schema": {
+                                "required": [
+                                    "username",
+                                    "password"
+                                ],
+                                "properties": {
+                                    "username": {
+                                        "type": "string",
+                                        "pattern": "^[A-Za-z0-9]+$",
+                                        "example": "Player",
+                                        "maxLength": 32,
+                                        "minLength": 3
+                                    },
+                                    "password": {
+                                        "type": "string",
+                                        "example": "secret123",
+                                        "maxLength": 32,
+                                        "minLength": 3
+                                    }
+                                },
+                                "type": "object"
+                            }
+                        }
+                    }
+                },
+                "responses": {
+                    "200": {
+                        "description": "Успешная авторизация",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "access_token": {
+                                            "description": "JWT access token",
+                                            "type": "string"
+                                        },
+                                        "token_type": {
+                                            "type": "string",
+                                            "example": "Bearer"
+                                        },
+                                        "expires_at": {
+                                            "type": "string",
+                                            "format": "date-time",
+                                            "example": "2026-04-20T13:00:00+00:00"
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    },
+                    "401": {
+                        "description": "Неверный логин или пароль",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "message": {
+                                            "type": "string",
+                                            "example": "Неверный логин или пароль."
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    },
+                    "422": {
+                        "description": "Ошибка валидации",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "message": {
+                                            "type": "string"
+                                        },
+                                        "errors": {
+                                            "type": "object"
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    },
+                    "429": {
+                        "description": "Слишком много запросов"
+                    }
+                }
+            }
+        },
+        "/api/launcher/manifest": {
+            "get": {
+                "tags": [
+                    "Launcher"
+                ],
+                "summary": "Получить манифест файлов клиента",
+                "description": "Возвращает JSON-манифест со списком файлов клиента, их размерами и SHA-256 хешами. Лаунчер сверяет локальные файлы с манифестом и докачивает недостающие.",
+                "operationId": "2c449e4bb08c2d4c838e36d260a3b61d",
+                "responses": {
+                    "200": {
+                        "description": "Манифест файлов",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "files": {
+                                            "type": "array",
+                                            "items": {
+                                                "properties": {
+                                                    "path": {
+                                                        "type": "string",
+                                                        "example": "Data/common.MPQ"
+                                                    },
+                                                    "size": {
+                                                        "type": "integer",
+                                                        "format": "int64",
+                                                        "example": 2881154862
+                                                    },
+                                                    "sha256": {
+                                                        "type": "string",
+                                                        "format": "hex",
+                                                        "example": "d850ffa5efd6a1ba845899a7d9f9ad27f6eea7ac606e95033506c72c86ee0236"
+                                                    }
+                                                },
+                                                "type": "object"
+                                            }
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    },
+                    "401": {
+                        "description": "Не авторизован",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "message": {
+                                            "type": "string",
+                                            "example": "Unauthenticated."
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "Манифест не найден в хранилище",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "message": {
+                                            "type": "string",
+                                            "example": "Манифест не найден."
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    }
+                },
+                "security": [
+                    {
+                        "bearerAuth": []
+                    }
+                ]
+            }
+        },
+        "/api/launcher/download/{path}": {
+            "get": {
+                "tags": [
+                    "Launcher"
+                ],
+                "summary": "Получить ссылку на скачивание файла",
+                "description": "Возвращает временную presigned-ссылку на файл в S3. Лаунчер скачивает файл напрямую из хранилища по этой ссылке. Путь может содержать вложенные директории (например `Data/ruRU/patch-ruRU-3.MPQ`).",
+                "operationId": "9a94331833a7af795c1c57dfa3a77eb3",
+                "parameters": [
+                    {
+                        "name": "path",
+                        "in": "path",
+                        "description": "Относительный путь к файлу из манифеста",
+                        "required": true,
+                        "schema": {
+                            "type": "string"
+                        },
+                        "example": "Data/common.MPQ"
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "Временная ссылка на скачивание",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "url": {
+                                            "description": "Presigned URL для скачивания",
+                                            "type": "string",
+                                            "format": "uri"
+                                        },
+                                        "expires_in": {
+                                            "description": "Время жизни ссылки в секундах",
+                                            "type": "integer",
+                                            "example": 3600
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    },
+                    "401": {
+                        "description": "Не авторизован",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "message": {
+                                            "type": "string",
+                                            "example": "Unauthenticated."
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "Файл не найден",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "properties": {
+                                        "message": {
+                                            "type": "string",
+                                            "example": "Файл не найден."
+                                        }
+                                    },
+                                    "type": "object"
+                                }
+                            }
+                        }
+                    }
+                },
+                "security": [
+                    {
+                        "bearerAuth": []
+                    }
+                ]
+            }
+        }
+    },
+    "components": {
+        "securitySchemes": {
+            "bearerAuth": {
+                "type": "http",
+                "description": "Токен, полученный через POST /api/launcher/login",
+                "bearerFormat": "JWT",
+                "scheme": "bearer"
+            }
+        }
+    },
+    "tags": [
+        {
+            "name": "Launcher Auth",
+            "description": "Launcher Auth"
+        },
+        {
+            "name": "Launcher",
+            "description": "Launcher"
+        }
+    ]
+}

test/features/launcher/application/client_sync_use_case_test.dart

@@ -0,0 +1,244 @@
+import 'dart:async';
+import 'dart:collection';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:moonwell_launcher/features/downloader/domain/entities/download_progress.dart';
+import 'package:moonwell_launcher/features/launcher/application/client_sync_use_case.dart';
+import 'package:moonwell_launcher/features/launcher/data/game_installation_service.dart';
+import 'package:moonwell_launcher/features/launcher/data/launcher_api_client.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_installation_snapshot.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_manifest.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_manifest_file.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_sync_status.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/local_client_file.dart';
+
+void main() {
+  group('ClientSyncUseCase', () {
+    test(
+      'completes without downloads when local snapshot matches manifest',
+      () async {
+        final manifest = _manifestFromFiles([
+          const ClientManifestFile(
+            path: 'Wow.exe',
+            size: 5,
+            sha256: 'wow-hash',
+          ),
+          const ClientManifestFile(
+            path: 'Data/common.MPQ',
+            size: 10,
+            sha256: 'data-hash',
+          ),
+        ]);
+        final matchingSnapshot = ClientInstallationSnapshot.fromFiles([
+          const LocalClientFile(path: 'Wow.exe', size: 5, sha256: 'wow-hash'),
+          const LocalClientFile(
+            path: 'Data/common.MPQ',
+            size: 10,
+            sha256: 'data-hash',
+          ),
+        ]);
+
+        final api = _FakeLauncherApiClient(manifest);
+        final installationService = _FakeGameInstallationService([
+          matchingSnapshot,
+        ]);
+        final useCase = ClientSyncUseCase(
+          launcherApiClient: api,
+          installationService: installationService,
+        );
+
+        final statuses = await useCase
+            .call(
+              ClientSyncUseCaseInput(
+                request: ClientSyncRequest(
+                  installationDir: 'C:/MoonWell',
+                  accessToken: 'token',
+                  manifest: manifest,
+                ),
+              ),
+            )
+            .toList();
+
+        expect(statuses.last.stage, ClientSyncStage.completed);
+        expect(statuses.last.message, 'Client is up to date.');
+        expect(api.downloadedPaths, isEmpty);
+        expect(installationService.deletedRelativeFiles, isEmpty);
+      },
+    );
+
+    test(
+      'removes stale files and downloads changed files before final verify',
+      () async {
+        final manifest = _manifestFromFiles([
+          const ClientManifestFile(
+            path: 'Wow.exe',
+            size: 5,
+            sha256: 'wow-hash',
+          ),
+          const ClientManifestFile(
+            path: 'Data/common.MPQ',
+            size: 10,
+            sha256: 'data-hash',
+          ),
+        ]);
+        final initialSnapshot = ClientInstallationSnapshot.fromFiles([
+          const LocalClientFile(path: 'Wow.exe', size: 5, sha256: 'old-wow'),
+          const LocalClientFile(path: 'legacy.txt', size: 2, sha256: 'legacy'),
+        ]);
+        final verifiedSnapshot = ClientInstallationSnapshot.fromFiles([
+          const LocalClientFile(path: 'Wow.exe', size: 5, sha256: 'wow-hash'),
+          const LocalClientFile(
+            path: 'Data/common.MPQ',
+            size: 10,
+            sha256: 'data-hash',
+          ),
+        ]);
+
+        final api = _FakeLauncherApiClient(manifest);
+        final installationService = _FakeGameInstallationService([
+          initialSnapshot,
+          verifiedSnapshot,
+        ]);
+        final useCase = ClientSyncUseCase(
+          launcherApiClient: api,
+          installationService: installationService,
+        );
+
+        final statuses = await useCase
+            .call(
+              ClientSyncUseCaseInput(
+                request: ClientSyncRequest(
+                  installationDir: 'C:/MoonWell',
+                  accessToken: 'token',
+                  manifest: manifest,
+                ),
+              ),
+            )
+            .toList();
+
+        expect(
+          statuses.map((status) => status.stage),
+          containsAll([
+            ClientSyncStage.removingStaleFiles,
+            ClientSyncStage.downloadingFiles,
+            ClientSyncStage.verifyingInstallation,
+            ClientSyncStage.completed,
+          ]),
+        );
+        expect(installationService.deletedRelativeFiles, ['legacy.txt']);
+        expect(api.downloadedPaths, ['Wow.exe', 'Data/common.MPQ']);
+        expect(statuses.last.message, 'Client is ready to play.');
+      },
+    );
+  });
+}
+
+ClientManifest _manifestFromFiles(List<ClientManifestFile> files) {
+  return ClientManifest.fromJson({
+    'files': files
+        .map(
+          (file) => {
+            'path': file.path,
+            'size': file.size,
+            'sha256': file.sha256,
+          },
+        )
+        .toList(),
+  });
+}
+
+class _FakeLauncherApiClient extends LauncherApiClient {
+  _FakeLauncherApiClient(this._manifest);
+
+  final ClientManifest _manifest;
+  final List<String> downloadedPaths = [];
+
+  @override
+  Future<ClientManifest> fetchManifest(String accessToken) async => _manifest;
+
+  @override
+  Future<void> downloadFile({
+    required String accessToken,
+    required ClientManifestFile file,
+    required String destinationPath,
+    required FutureOr<bool> Function()? isCancelled,
+    required void Function(int chunkBytes) onChunkReceived,
+  }) async {
+    downloadedPaths.add(file.path);
+    onChunkReceived(file.size);
+  }
+}
+
+class _FakeGameInstallationService extends GameInstallationService {
+  _FakeGameInstallationService(List<ClientInstallationSnapshot> snapshots)
+    : _snapshots = Queue.of(snapshots);
+
+  final Queue<ClientInstallationSnapshot> _snapshots;
+  final List<String> ensuredParentDirectories = [];
+  final List<String> deletedRelativeFiles = [];
+  final List<String> deletedFiles = [];
+  final List<String> replacedDestinations = [];
+
+  @override
+  Future<ClientInstallationSnapshot> scanInstallation(
+    String installationDir, {
+    InstallationScanProgressCallback? onProgress,
+    FutureOr<bool> Function()? isCancelled,
+  }) async {
+    final snapshot = _snapshots.removeFirst();
+    var processedFiles = 0;
+    var processedBytes = 0;
+
+    for (final file in snapshot.files) {
+      processedFiles += 1;
+      processedBytes += file.size;
+      onProgress?.call(
+        DownloadProgress(
+          speed: 0,
+          downloaded: processedBytes,
+          total: snapshot.files.fold<int>(0, (sum, item) => sum + item.size),
+          eta: Duration.zero,
+        ),
+        file.path,
+        processedFiles,
+        snapshot.files.length,
+      );
+    }
+
+    return snapshot;
+  }
+
+  @override
+  Future<void> deleteRelativeFile(
+    String installationDir,
+    String relativePath,
+  ) async {
+    deletedRelativeFiles.add(relativePath);
+  }
+
+  @override
+  String resolveClientPath(String installationDir, String relativePath) {
+    return '$installationDir/$relativePath';
+  }
+
+  @override
+  Future<void> ensureParentDirectoryExists(String filePath) async {
+    ensuredParentDirectories.add(filePath);
+  }
+
+  @override
+  Future<void> deleteFileIfExists(String filePath) async {
+    deletedFiles.add(filePath);
+  }
+
+  @override
+  Future<bool> verifySha256(String filePath, String expectedHash) async => true;
+
+  @override
+  Future<void> replaceFile({
+    required String temporaryPath,
+    required String destinationPath,
+  }) async {
+    replacedDestinations.add(destinationPath);
+  }
+}

test/features/launcher/data/game_installation_service_test.dart

@@ -0,0 +1,148 @@
+import 'dart:io';
+import 'dart:convert';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:moonwell_launcher/config.dart';
+import 'package:moonwell_launcher/features/launcher/data/game_installation_service.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_hash_entry.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/launcher_exception.dart';
+
+void main() {
+  group('GameInstallationService', () {
+    late Directory rootDirectory;
+    late GameInstallationService service;
+
+    setUp(() async {
+      service = GameInstallationService();
+      rootDirectory = await Directory.systemTemp.createTemp(
+        'moonwell_launcher_',
+      );
+
+      await File(
+        '${rootDirectory.path}${Platform.pathSeparator}Wow.exe',
+      ).writeAsString('wow');
+      await Directory(
+        '${rootDirectory.path}${Platform.pathSeparator}Data',
+      ).create(recursive: true);
+      await File(
+        '${rootDirectory.path}${Platform.pathSeparator}Data${Platform.pathSeparator}common.MPQ',
+      ).writeAsString('data');
+
+      await Directory(
+        '${rootDirectory.path}${Platform.pathSeparator}Cache',
+      ).create(recursive: true);
+      await File(
+        '${rootDirectory.path}${Platform.pathSeparator}Cache${Platform.pathSeparator}cache.bin',
+      ).writeAsString('cache');
+
+      await Directory(
+        '${rootDirectory.path}${Platform.pathSeparator}Logs',
+      ).create(recursive: true);
+      await File(
+        '${rootDirectory.path}${Platform.pathSeparator}Logs${Platform.pathSeparator}launcher.log',
+      ).writeAsString('log');
+    });
+
+    tearDown(() async {
+      if (await rootDirectory.exists()) {
+        await rootDirectory.delete(recursive: true);
+      }
+    });
+
+    test('scanInstallation ignores excluded directories', () async {
+      final snapshot = await service.scanInstallation(rootDirectory.path);
+      final paths = snapshot.files.map((file) => file.path).toList()..sort();
+
+      expect(paths, ['Data/common.MPQ', 'Wow.exe']);
+      expect(snapshot.buildHash, computeBuildHash(snapshot.files));
+    });
+
+    test(
+      'scanInstallation creates launcher hash cache outside verification set',
+      () async {
+        await service.scanInstallation(rootDirectory.path);
+
+        final cacheFile = File(service.getHashCachePath(rootDirectory.path));
+        expect(await cacheFile.exists(), isTrue);
+
+        final secondSnapshot = await service.scanInstallation(
+          rootDirectory.path,
+        );
+        final paths = secondSnapshot.files.map((file) => file.path).toList()
+          ..sort();
+
+        expect(paths, ['Data/common.MPQ', 'Wow.exe']);
+        expect(
+          await Directory(
+            '${rootDirectory.path}${Platform.pathSeparator}${Config.launcherMetadataDirectoryName}',
+          ).exists(),
+          isTrue,
+        );
+      },
+    );
+
+    test(
+      'scanInstallation reuses cached hash when file metadata did not change',
+      () async {
+        await service.scanInstallation(rootDirectory.path);
+
+        final cacheFile = File(service.getHashCachePath(rootDirectory.path));
+        final cacheJson =
+            jsonDecode(await cacheFile.readAsString()) as Map<String, dynamic>;
+        final entries = (cacheJson['entries'] as Map).cast<String, dynamic>();
+
+        entries['Wow.exe'] = {
+          'size': 3,
+          'modifiedMs': await File(
+            '${rootDirectory.path}${Platform.pathSeparator}Wow.exe',
+          ).lastModified().then((value) => value.millisecondsSinceEpoch),
+          'sha256': 'cached-wow-hash',
+        };
+
+        await cacheFile.writeAsString(
+          jsonEncode({'version': 1, 'entries': entries}),
+          flush: true,
+        );
+
+        final snapshot = await service.scanInstallation(rootDirectory.path);
+        final wowFile = snapshot.files.firstWhere(
+          (file) => file.path == 'Wow.exe',
+        );
+
+        expect(wowFile.sha256, 'cached-wow-hash');
+      },
+    );
+
+    test('clearCache recreates an empty cache directory', () async {
+      await service.clearCache(rootDirectory.path);
+
+      final cacheDirectory = Directory(
+        '${rootDirectory.path}${Platform.pathSeparator}Cache',
+      );
+
+      expect(await cacheDirectory.exists(), isTrue);
+      expect(await cacheDirectory.list().isEmpty, isTrue);
+    });
+
+    test('ensureParentDirectoryExists creates nested directories', () async {
+      final tempPath =
+          '${rootDirectory.path}${Platform.pathSeparator}Data${Platform.pathSeparator}patches${Platform.pathSeparator}common-2.MPQ.moonwell.part';
+
+      await service.ensureParentDirectoryExists(tempPath);
+
+      expect(
+        await Directory(
+          '${rootDirectory.path}${Platform.pathSeparator}Data${Platform.pathSeparator}patches',
+        ).exists(),
+        isTrue,
+      );
+    });
+
+    test('resolveClientPath rejects path traversal', () {
+      expect(
+        () => service.resolveClientPath(rootDirectory.path, '../evil.txt'),
+        throwsA(isA<LauncherSyncException>()),
+      );
+    });
+  });
+}

test/features/launcher/domain/client_hash_entry_test.dart

@@ -0,0 +1,33 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/client_hash_entry.dart';
+import 'package:moonwell_launcher/features/launcher/domain/entities/local_client_file.dart';
+
+void main() {
+  group('client hash entry helpers', () {
+    test('normalizeClientPath normalizes slashes and strips leading dot', () {
+      expect(normalizeClientPath(r'.\Data\common.MPQ'), 'Data/common.MPQ');
+      expect(normalizeClientPath('./Wow.exe'), 'Wow.exe');
+    });
+
+    test('computeBuildHash is deterministic and order independent', () {
+      final left = [
+        const LocalClientFile(
+          path: r'.\Data\common.MPQ',
+          size: 12,
+          sha256: 'ABCDEF',
+        ),
+        const LocalClientFile(path: 'Wow.exe', size: 34, sha256: '123456'),
+      ];
+      final right = [
+        const LocalClientFile(path: 'Wow.exe', size: 34, sha256: '123456'),
+        const LocalClientFile(
+          path: 'Data/common.MPQ',
+          size: 12,
+          sha256: 'abcdef',
+        ),
+      ];
+
+      expect(computeBuildHash(left), computeBuildHash(right));
+    });
+  });
+}