feat: new version check (#102)

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

@@ -1,7 +1,17 @@
+import 'dart:convert';
+
 import 'package:get/get.dart';
+import 'package:gopeed/api/api.dart';
 
 class SettingController extends GetxController {
   final tapStatues = <String, bool>{}.obs;
+  final latestVersion = "".obs;
+
+  @override
+  void onInit() {
+    super.onInit();
+    fetchLatestVersion();
+  }
 
   // set all tap status to false
   void clearTap() {
@@ -13,4 +23,22 @@ class SettingController extends GetxController {
     clearTap();
     tapStatues[key] = true;
   }
+
+  // fetch latest version
+  void fetchLatestVersion() async {
+    String? releaseDataStr;
+    try {
+      releaseDataStr =
+          (await proxyRequest("https://gopeed.com/api/release")).data;
+    } catch (e) {
+      releaseDataStr = (await proxyRequest(
+              "https://api.github.com/repos/GopeedLab/gopeed/releases/latest"))
+          .data;
+    }
+    if (releaseDataStr == null) {
+      return;
+    }
+    final releaseData = jsonDecode(releaseDataStr);
+    latestVersion.value = releaseData["tag_name"].substring(1);
+  }
 }