Move handling deep links to app root

lib/src/screens/root/root.dart

@@ -1,10 +1,12 @@
 import 'dart:async';
+import 'package:cake_wallet/utils/payment_request.dart';
 import 'package:flutter/material.dart';
 import 'package:cake_wallet/routes.dart';
 import 'package:cake_wallet/src/screens/auth/auth_page.dart';
 import 'package:cake_wallet/store/app_store.dart';
 import 'package:cake_wallet/store/authentication_store.dart';
 import 'package:cake_wallet/entities/qr_scanner.dart';
+import 'package:uni_links/uni_links.dart';
 
 class Root extends StatefulWidget {
   Root(
@@ -35,6 +37,9 @@ class RootState extends State<Root> with WidgetsBindingObserver {
   bool _isInactive;
   bool _postFrameCallback;
 
+  StreamSubscription<Uri?>? stream;
+  Uri? launchUri;
+
   @override
   void initState() {
     _isInactiveController = StreamController<bool>.broadcast();
@@ -42,6 +47,34 @@ class RootState extends State<Root> with WidgetsBindingObserver {
     _postFrameCallback = false;
     WidgetsBinding.instance.addObserver(this);
     super.initState();
+
+    initUniLinks();
+  }
+
+  @override
+  void dispose() {
+    stream?.cancel();
+    super.dispose();
+  }
+
+  /// handle app links while the app is already started
+  /// whether its in the foreground or in the background.
+  Future<void> initUniLinks() async {
+    try {
+      stream = uriLinkStream.listen((Uri? uri) {
+        handleDeepLinking(uri);
+      });
+
+      handleDeepLinking(await getInitialUri());
+    } catch (e) {
+      print(e);
+    }
+  }
+
+  void handleDeepLinking(Uri? uri) {
+    if (uri == null || !mounted) return;
+
+    launchUri = uri;
   }
 
   @override
@@ -75,7 +108,11 @@ class RootState extends State<Root> with WidgetsBindingObserver {
           }
 
           _reset();
-          auth.close();
+          auth.close(
+            route: launchUri != null ? Routes.send : null,
+            arguments: PaymentRequest.fromUri(launchUri),
+          );
+          launchUri = null;
         });
       });
     }