27 Add silent payment support

lib/src/enums/destination_type.dart

@@ -5,7 +5,8 @@ enum DestinationType {
   lnUrl('ln_url'),
   tetherAddress('tether_address'),
   lnAddress('ln_address'),
-  arkAddress('ark_address');
+  arkAddress('ark_address'),
+  silentPayment('silent_payment');
 
   const DestinationType(this.jsonValue);
   final String jsonValue;

lib/src/helpers/branta_extensions.dart

@@ -12,9 +12,15 @@ extension StringBrantaExtensions on String {
 
   bool isArk() => toLowerCase().startsWith('ark1');
 
+  bool isSilentPayment() {
+    final lower = toLowerCase();
+    return lower.startsWith('sp1') || lower.startsWith('tsp1');
+  }
+
   DestinationType? getHashZkType() {
     if (isBolt11()) return DestinationType.bolt11;
     if (isArk()) return DestinationType.arkAddress;
+    if (isSilentPayment()) return DestinationType.silentPayment;
     return null;
   }
 

lib/src/v2/classes/qr_parser.dart

@@ -47,6 +47,11 @@ class QRParser {
         destinations.add(QrDestination(arkValue, _detectPlainTextType(arkValue)));
       }
 
+      final silentPaymentValue = queryParams['silent_payment'];
+      if (silentPaymentValue != null) {
+        destinations.add(QrDestination(silentPaymentValue, _detectPlainTextType(silentPaymentValue)));
+      }
+
       return;
     }
 
@@ -86,6 +91,7 @@ class QRParser {
     if (value.toLowerCase().startsWith('lno')) return DestinationType.bolt12;
     if (value.toLowerCase().startsWith('lnurl')) return DestinationType.lnUrl;
     if (value.isArk()) return DestinationType.arkAddress;
+    if (value.isSilentPayment()) return DestinationType.silentPayment;
     if (_isEthereumAddress(value)) return DestinationType.tetherAddress;
     if (_isTronAddress(value)) return DestinationType.tetherAddress;
     if (_isLnAddress(value)) return DestinationType.lnAddress;

test/branta_test.dart

@@ -326,6 +326,23 @@ void main() {
       expect('bc1qabc'.isArk(), isFalse);
     });
 
+    test('isSilentPayment returns true for sp1 prefix', () {
+      expect('sp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw'.isSilentPayment(), isTrue);
+    });
+
+    test('isSilentPayment returns true for tsp1 prefix', () {
+      expect('tsp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw'.isSilentPayment(), isTrue);
+    });
+
+    test('isSilentPayment is case-insensitive', () {
+      expect('SP1QQWL5P9JHZ'.isSilentPayment(), isTrue);
+    });
+
+    test('isSilentPayment returns false for non-sp values', () {
+      expect('bc1qabc'.isSilentPayment(), isFalse);
+      expect('ark1qqjqtest'.isSilentPayment(), isFalse);
+    });
+
     test('getHashZkType returns bolt11 for bolt11 invoice', () {
       expect(_bolt11Invoice.getHashZkType(), equals(DestinationType.bolt11));
     });
@@ -334,6 +351,11 @@ void main() {
       expect(_arkAddress.getHashZkType(), equals(DestinationType.arkAddress));
     });
 
+    test('getHashZkType returns silentPayment for silent payment address', () {
+      expect('sp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw'.getHashZkType(),
+          equals(DestinationType.silentPayment));
+    });
+
     test('getHashZkType returns null for bitcoin address', () {
       expect(_bitcoinAddress.getHashZkType(), isNull);
     });
@@ -471,6 +493,20 @@ void main() {
       expect(result.destinationType, equals(DestinationType.arkAddress));
     });
 
+    test('silent payment address sets silentPayment type', () {
+      final result = QRParser('sp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw');
+
+      expect(result.destination, equals('sp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw'));
+      expect(result.destinationType, equals(DestinationType.silentPayment));
+    });
+
+    test('testnet silent payment address sets silentPayment type', () {
+      final result = QRParser('tsp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw');
+
+      expect(result.destination, equals('tsp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw'));
+      expect(result.destinationType, equals(DestinationType.silentPayment));
+    });
+
     test('unrecognized text sets null type', () {
       final result = QRParser('not-any-known-format');
 
@@ -512,6 +548,17 @@ void main() {
       expect(result.destinations[2].type, equals(DestinationType.arkAddress));
       expect(result.isOnChainZk(), isFalse);
     });
+
+    test('bitcoin URI with silent_payment param adds silentPayment destination', () {
+      final result = QRParser(
+          'bitcoin:1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa?silent_payment=sp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw');
+
+      expect(result.destinations.length, equals(2));
+      expect(result.destination, equals('1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa'));
+      expect(result.destinationType, equals(DestinationType.bitcoinAddress));
+      expect(result.destinations[1].value, equals('sp1qqwl5p9jhz0000h5zkvlf9gfqv9dl9qjp5ggq5x3fw'));
+      expect(result.destinations[1].type, equals(DestinationType.silentPayment));
+    });
   });
 
   // -------------------------------------------------------------------------
@@ -599,6 +646,7 @@ void main() {
       (DestinationType.tetherAddress, 'tether_address'),
       (DestinationType.lnAddress, 'ln_address'),
       (DestinationType.arkAddress, 'ark_address'),
+      (DestinationType.silentPayment, 'silent_payment'),
     ]) {
       test('destinationType $type serializes to "$expected"', () {
         final dest = Destination(value: 'addr', type: type);