feat: auto updater (#933)

ui/flutter/lib/app/modules/setting/controllers/setting_controller.dart

@@ -1,11 +1,10 @@
-import 'dart:convert';
-
 import 'package:get/get.dart';
-import 'package:gopeed/api/api.dart';
+
+import '../../../../util/updater.dart';
 
 class SettingController extends GetxController {
   final tapStatues = <String, bool>{}.obs;
-  final latestVersion = "".obs;
+  final latestVersion = Rxn<VersionInfo>();
 
   @override
   void onInit() {
@@ -26,23 +25,6 @@ class SettingController extends GetxController {
 
   // fetch latest version
   void fetchLatestVersion() async {
-    String? releaseDataStr;
-    try {
-      releaseDataStr = (await proxyRequest(
-              "https://api.github.com/repos/GopeedLab/gopeed/releases/latest"))
-          .data;
-    } catch (e) {
-      releaseDataStr =
-          (await proxyRequest("https://gopeed.com/api/release")).data;
-    }
-    if (releaseDataStr == null) {
-      return;
-    }
-    final releaseData = jsonDecode(releaseDataStr);
-    final tagName = releaseData["tag_name"];
-    if (tagName == null) {
-      return;
-    }
-    latestVersion.value = releaseData["tag_name"].substring(1);
+    latestVersion.value = await checkUpdate();
   }
 }