CW1612: AnyPay Service Layer (#3516)

* fix android CI

* feat: add anypay core models, parser and routing engine

* feat: add anypay resolver, anypay service and wallet switch service

* refactor: route the send page payment flow through anypay service

* fix: show message when there's no swap providers for a pair and reset the trade guard on dismissal

* refactor: merge the swap from network and send to network decision pages together and clean up anypay widgets

* feat: reapply deep links to a currently open send flow and register the solana scheme

* feat: add support for zcash address detection to anypay and other minor fixes

* refactor: remove trailing icon

* feat: hide swap flow for sp and mweb addresses

* feat: enhance zcash address detection and deeplink handling

* fix: pin bitcoin_base

* refactor: Move the anypay decision navigation out of the send page and address minor review comments

* refactor: Move the anypay decision navigation out of the send page and address minor review comments

* feat: handle exception in switch service and mvoe balance compute to call site

* refactor: combine anypay entry points to one and extract selected mode widget

---------

Co-authored-by: Czarek Nakamoto <cyjan@mrcyjanek.net>

lib/view_model/exchange/exchange_view_model.dart

@@ -2,12 +2,10 @@ import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:developer';
-import 'dart:math' show min;
 
 import 'package:bitcoin_base/bitcoin_base.dart';
 import 'package:cake_wallet/.secrets.g.dart' as secrets;
 import 'package:cake_wallet/bitcoin/bitcoin.dart';
-import 'package:cake_wallet/core/address_validator.dart';
 import 'package:cake_wallet/core/amount_parsing_proxy.dart';
 import 'package:cake_wallet/core/create_trade_result.dart';
 import 'package:cake_wallet/core/fiat_conversion_service.dart';
@@ -415,6 +413,9 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
   @observable
   bool tradeStarted = false;
 
+  @observable
+  bool noProviderForPair = false;
+
   @observable
   bool isSendFromExternal = false;
 
@@ -980,6 +981,7 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
       bestRate = _sortedAvailableProviders.keys.first;
       bestRateProvider = _sortedAvailableProviders.values.first;
     }
+    noProviderForPair = _sortedAvailableProviders.isEmpty;
   }
 
   @action
@@ -1603,24 +1605,6 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
     }
   }
 
-  String? _addressTypeValidation(String refundAddress, String receiveAddress) {
-    final isRefundAddressSP =
-        RegExp(AddressValidator.silentPaymentAddressPatternMainnet).hasMatch(refundAddress);
-    if (isRefundAddressSP) return 'Silent Payment ${S.current.address_not_allowed_as_refund}';
-
-    final isReceiveAddressSP =
-        RegExp(AddressValidator.silentPaymentAddressPatternMainnet).hasMatch(receiveAddress);
-    if (isReceiveAddressSP) return 'Silent Payment ${S.current.address_not_allowed_as_receive}';
-
-    final isRefundAddressMWEB = RegExp(AddressValidator.mWebAddressPattern).hasMatch(refundAddress);
-    if (isRefundAddressMWEB) return 'MWEB ${S.current.address_not_allowed_as_refund}';
-
-    final isReceiveAddressMWEB =
-        RegExp(AddressValidator.mWebAddressPattern).hasMatch(receiveAddress);
-    if (isReceiveAddressMWEB) return 'MWEB ${S.current.address_not_allowed_as_receive}';
-    return null;
-  }
-
   void _defineIsReceiveAmountEditable() {
     /*if ((provider is ChangeNowExchangeProvider)
         &&(depositCurrency == CryptoCurrency.xmr)

lib/view_model/link_view_model.dart

@@ -25,6 +25,10 @@ class LinkViewModel {
   Uri? currentLink;
   bool readyToOpenPage = false;
 
+  final StreamController<Uri> _incomingPaymentLinksController = StreamController<Uri>.broadcast();
+
+  Stream<Uri> get incomingPaymentLinks => _incomingPaymentLinksController.stream;
+
   bool get _isValidPaymentUri => currentLink?.path.isNotEmpty ?? false;
   bool get isWalletConnectLink => currentLink?.authority == 'wc';
   bool get isNanoGptLink => currentLink?.scheme == 'nano-gpt';
@@ -96,7 +100,10 @@ class LinkViewModel {
     }
 
     if (_isValidPaymentUri) {
-      return {"paymentRequest": PaymentRequest.fromUri(currentLink)};
+      return {
+        "paymentRequest": PaymentRequest.fromUri(currentLink),
+        "rawLink": currentLink.toString(),
+      };
     }
 
     return null;
@@ -132,8 +139,20 @@ class LinkViewModel {
         return;
       }
 
-      // Prevent navigating to the same route again.
+      if (route == Routes.send &&
+          !isQuickActionLink &&
+          currentLink != null &&
+          _incomingPaymentLinksController.hasListener) {
+        final link = currentLink!;
+        currentLink = null;
+        _incomingPaymentLinksController.add(link);
+        return;
+      }
+
+      // Prevent navigating to the same route again and clear the link so a later auth
+      // event cannot refire it.
       if (appStore.currentRouteName == route) {
+        currentLink = null;
         return;
       }
 

lib/view_model/send/send_view_model.dart

@@ -1730,6 +1730,11 @@ abstract class SendViewModelBase extends WalletChangeListenerViewModel with Stor
     }
   }
 
+  @action
+  void applyAnyPayCurrency(CryptoCurrency currency) {
+    selectedCryptoCurrency = currency;
+  }
+
   String _decodeMethodSelector(String s) =>
       (s.startsWith('0x') && s.length >= 10) ? s.substring(0, 10) : '';
 }