feat: extension store (#1301)

ui/flutter/lib/api/gopeed_site_api.dart

@@ -0,0 +1,55 @@
+import 'dart:convert';
+
+import 'package:dio/dio.dart';
+
+import 'api.dart';
+import 'model/store_extension.dart';
+
+class GopeedSiteApi {
+  GopeedSiteApi._();
+
+  static final instance = GopeedSiteApi._();
+
+  static const _host = 'gopeed.com';
+
+  Future<Map<String, dynamic>> getRelease() async {
+    final json = await _getJson('/api/release');
+    return json as Map<String, dynamic>;
+  }
+
+  Future<StoreExtensionPage> getExtensions({
+    int page = 1,
+    int limit = 20,
+    StoreExtensionSort sort = StoreExtensionSort.stars,
+    StoreSortOrder order = StoreSortOrder.desc,
+    String? query,
+  }) async {
+    final json = await _getJson('/api/extensions', queryParameters: {
+      'page': page.toString(),
+      'limit': limit.clamp(1, 100).toString(),
+      'sort': sort.name,
+      'order': order.name,
+      if (query != null && query.trim().isNotEmpty) 'q': query.trim(),
+    });
+    return StoreExtensionPage.fromJson(json as Map<String, dynamic>);
+  }
+
+  Future<void> reportExtensionInstall(String id) async {
+    final uri = Uri.https(_host, '/api/extensions/install');
+    await proxyRequest(
+      uri.toString(),
+      data: {'id': id},
+      options: Options(method: 'POST', contentType: Headers.jsonContentType),
+    );
+  }
+
+  Future<dynamic> _getJson(String path,
+      {Map<String, String>? queryParameters}) async {
+    final uri = Uri.https(_host, path, queryParameters);
+    final Response<String> response = await proxyRequest(uri.toString());
+    if (response.data == null || response.data!.isEmpty) {
+      throw Exception('Empty response from $uri');
+    }
+    return jsonDecode(response.data!);
+  }
+}