Implement native web auth

lib/core/auth/oauth2/tb_oauth2_client.dart

@@ -1,8 +1,8 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:flutter_web_auth/flutter_web_auth.dart';
 import 'package:thingsboard_app/constants/app_constants.dart';
+import 'package:thingsboard_app/core/auth/web/tb_web_auth.dart';
 import 'package:thingsboard_app/core/context/tb_context.dart';
 import 'package:dart_jsonwebtoken/dart_jsonwebtoken.dart';
 import 'package:crypto/crypto.dart';
@@ -49,9 +49,9 @@ class TbOAuth2Client {
     params['pkg'] = pkgName;
     params['appToken'] = appToken;
     url = url.replace(queryParameters: params);
-    final result = await FlutterWebAuth.authenticate(
+    final result = await TbWebAuth.authenticate(
         url: url.toString(),
-        callbackUrlScheme: ThingsboardAppConstants.thingsboardOAuth2CallbackUrlScheme);
+        callbackUrlScheme: ThingsboardAppConstants.thingsboardOAuth2CallbackUrlScheme, saveHistory: false);
     final resultUri = Uri.parse(result);
     final error = resultUri.queryParameters['error'];
     if (error != null) {

lib/core/auth/web/tb_web_auth.dart

@@ -0,0 +1,40 @@
+import 'dart:async';
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/services.dart' show MethodChannel;
+
+class _OnAppLifecycleResumeObserver extends WidgetsBindingObserver {
+  final Function onResumed;
+
+  _OnAppLifecycleResumeObserver(this.onResumed);
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (state == AppLifecycleState.resumed) {
+      onResumed();
+    }
+  }
+}
+
+class TbWebAuth {
+  static const MethodChannel _channel = const MethodChannel('tb_web_auth');
+
+  static final _OnAppLifecycleResumeObserver _resumedObserver = _OnAppLifecycleResumeObserver(() {
+    _cleanUpDanglingCalls();
+  });
+
+  static Future<String> authenticate({required String url, required String callbackUrlScheme, bool? saveHistory}) async {
+    WidgetsBinding.instance?.removeObserver(_resumedObserver); // safety measure so we never add this observer twice
+    WidgetsBinding.instance?.addObserver(_resumedObserver);
+    return await _channel.invokeMethod('authenticate', <String, dynamic>{
+      'url': url,
+      'callbackUrlScheme': callbackUrlScheme,
+      'saveHistory': saveHistory,
+    }) as String;
+  }
+
+  static Future<void> _cleanUpDanglingCalls() async {
+    await _channel.invokeMethod('cleanUpDanglingCalls');
+    WidgetsBinding.instance?.removeObserver(_resumedObserver);
+  }
+}