CW-315-Add-a-toast-message-to-enable-denied-permissions-in-device-settings (#1157)

* add permission handler

* localization

* minor fixes

---------

Co-authored-by: OmarHatem <omarh.ismail1@gmail.com>

lib/src/screens/nodes/node_create_or_edit_page.dart

@@ -69,7 +69,7 @@ class NodeCreateOrEditPage extends BasePage {
   @override
   Widget trailing(BuildContext context) => IconButton(
         onPressed: () async {
-          await nodeCreateOrEditViewModel.scanQRCodeForNewNode();
+          await nodeCreateOrEditViewModel.scanQRCodeForNewNode(context);
         },
         splashColor: Colors.transparent,
         highlightColor: Colors.transparent,

lib/src/screens/nodes/pow_node_create_or_edit_page.dart

@@ -69,7 +69,7 @@ class PowNodeCreateOrEditPage extends BasePage {
   @override
   Widget trailing(BuildContext context) => IconButton(
         onPressed: () async {
-          await nodeCreateOrEditViewModel.scanQRCodeForNewNode();
+          await nodeCreateOrEditViewModel.scanQRCodeForNewNode(context);
         },
         splashColor: Colors.transparent,
         highlightColor: Colors.transparent,

lib/src/screens/restore/restore_options_page.dart

@@ -12,6 +12,8 @@ import 'package:cake_wallet/routes.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:cake_wallet/src/screens/base_page.dart';
 import 'package:cake_wallet/generated/i18n.dart';
+import 'package:permission_handler/permission_handler.dart';
+import 'package:cake_wallet/utils/permission_handler.dart';
 
 class RestoreOptionsPage extends BasePage {
   RestoreOptionsPage({required this.isNewInstall});
@@ -55,6 +57,9 @@ class RestoreOptionsPage extends BasePage {
                   padding: EdgeInsets.only(top: 24),
                   child: OptionTile(
                       onPressed: () async {
+                        bool isCameraPermissionGranted =
+                        await PermissionHandler.checkPermission(Permission.camera, context);
+                        if (!isCameraPermissionGranted) return;
                         bool isPinSet = false;
                         if (isNewInstall) {
                           await Navigator.pushNamed(context, Routes.setupPin,

lib/src/screens/wallet_connect/wc_connections_listing_view.dart

@@ -8,10 +8,12 @@ import 'package:cake_wallet/themes/extensions/cake_text_theme.dart';
 import 'package:cake_wallet/utils/device_info.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_mobx/flutter_mobx.dart';
+import 'package:permission_handler/permission_handler.dart';
 import 'package:walletconnect_flutter_v2/walletconnect_flutter_v2.dart';
 import 'package:cake_wallet/entities/qr_scanner.dart';
 import 'package:cake_wallet/src/widgets/primary_button.dart';
 import 'package:cake_wallet/utils/show_pop_up.dart';
+import 'package:cake_wallet/utils/permission_handler.dart';
 
 import 'widgets/pairing_item_widget.dart';
 import 'wc_pairing_detail_page.dart';
@@ -58,6 +60,9 @@ class WCPairingsWidget extends BasePage {
     final String? uri;
 
     if (DeviceInfo.instance.isMobile) {
+      bool isCameraPermissionGranted =
+      await PermissionHandler.checkPermission(Permission.camera, context);
+      if (!isCameraPermissionGranted) return;
       uri = await presentQRScanner();
     } else {
       uri = await _showEnterWalletConnectURIPopUp(context);

lib/src/widgets/address_text_field.dart

@@ -9,6 +9,8 @@ import 'package:cake_wallet/entities/qr_scanner.dart';
 import 'package:cake_wallet/entities/contact_base.dart';
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cake_wallet/themes/extensions/send_page_theme.dart';
+import 'package:cake_wallet/utils/permission_handler.dart';
+import 'package:permission_handler/permission_handler.dart';
 
 enum AddressTextFieldOption { paste, qrCode, addressBook }
 
@@ -188,6 +190,9 @@ class AddressTextField extends StatelessWidget {
   }
 
   Future<void> _presentQRScanner(BuildContext context) async {
+    bool isCameraPermissionGranted =
+    await PermissionHandler.checkPermission(Permission.camera, context);
+    if (!isCameraPermissionGranted) return;
     final code = await presentQRScanner();
     if (code.isEmpty) {
       return;

lib/utils/permission_handler.dart

@@ -0,0 +1,32 @@
+import 'package:cake_wallet/generated/i18n.dart';
+import 'package:cake_wallet/utils/show_bar.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:permission_handler/permission_handler.dart';
+
+class PermissionHandler {
+  static Future<bool> checkPermission(Permission permission, BuildContext context) async {
+    final Map<Permission, String> _permissionMessages = {
+      Permission.camera: S.of(context).camera_permission_is_required,
+    };
+
+    var status = await permission.status;
+
+    if (status.isDenied) {
+      status = await permission.request();
+    }
+
+    if (status.isPermanentlyDenied || status.isDenied) {
+      String? message = _permissionMessages[permission];
+      if (message != null) {
+        showBar<void>(context, message);
+      }
+      return false;
+    }
+
+    if (status.isGranted) {
+      return true;
+    }
+
+    return false;
+  }
+}

lib/view_model/node_list/node_create_or_edit_view_model.dart

@@ -1,11 +1,14 @@
 import 'package:cake_wallet/core/execution_state.dart';
 import 'package:cake_wallet/entities/qr_scanner.dart';
 import 'package:cake_wallet/store/settings_store.dart';
+import 'package:flutter/cupertino.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
 import 'package:cw_core/node.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:collection/collection.dart';
+import 'package:cake_wallet/utils/permission_handler.dart';
+import 'package:permission_handler/permission_handler.dart';
 
 part 'node_create_or_edit_view_model.g.dart';
 
@@ -175,8 +178,11 @@ abstract class NodeCreateOrEditViewModelBase with Store {
   void setAsCurrent(Node node) => _settingsStore.nodes[_walletType] = node;
 
   @action
-  Future<void> scanQRCodeForNewNode() async {
+  Future<void> scanQRCodeForNewNode(BuildContext context) async {
     try {
+      bool isCameraPermissionGranted =
+      await PermissionHandler.checkPermission(Permission.camera, context);
+      if (!isCameraPermissionGranted) return;
       String code = await presentQRScanner();
 
       if (code.isEmpty) {