feat: download latest patches and integrations.

lib/backend/api/manager_api.dart

@@ -1,10 +1,45 @@
 import 'dart:io';
-import 'package:permission_handler/permission_handler.dart';
+import 'package:dio/dio.dart';
 import 'package:path_provider/path_provider.dart' as p;
+import 'package:revanced_manager_flutter/constants.dart';
+import 'github_api.dart';
 
 // use path_provider to get the path of the storage directory
+Dio dio = Dio();
+GithubAPI githubAPI = GithubAPI();
 
-void getPath() async {
-  final path = await p.getExternalStorageDirectory();
-  print(path);
+Future<String?> getPath() async {
+  final path = await p.getApplicationSupportDirectory();
+  final workDir = Directory('${path.path}/revanced').createSync();
+  final workDirPath = "${path.path}/revanced";
+  return workDirPath;
+}
+
+Future<File?> downloadAssets(String repo) async {
+  try {
+    final workDir = await getPath();
+    final dlUrl = await githubAPI.latestRelease(ghOrg, repo);
+    final name =
+        dlUrl?.split('/').lastWhere((element) => element.contains('revanced'));
+    print(name);
+    final assetFile = File('$workDir/$name');
+    final response = await dio.get(
+      dlUrl!,
+      options: Options(
+        responseType: ResponseType.bytes,
+        followRedirects: true,
+        receiveTimeout: 0,
+      ),
+      onReceiveProgress: (count, total) {
+        print('$count/$total');
+      },
+    );
+    final raf = assetFile.openSync(mode: FileMode.write);
+    raf.writeFromSync(response.data);
+    raf.closeSync();
+    return assetFile;
+  } catch (e) {
+    print(e);
+    return null;
+  }
 }