Merge pull request #64 from Forte11Cuba/feature/peanut-emoji-encoding

feat: add peanut emoji encoding for Cashu tokens

lib/core/utils/incoming_data_parser.dart

@@ -1,5 +1,7 @@
 // Parser para detectar el tipo de dato entrante (QR, clipboard, etc.)
-// Soporta: tokens Cashu (A/B), invoices Lightning, URLs de mint, payment requests
+// Soporta: tokens Cashu (A/B), invoices Lightning, URLs de mint, payment requests, peanut emoji
+
+import 'peanut_codec.dart';
 
 /// Modo de escaneo
 enum ScanMode {
@@ -57,6 +59,15 @@ class IncomingDataParser {
   /// Detecta el tipo de dato y extrae información relevante
   static ParsedData parse(String data) {
     final trimmed = data.trim();
+
+    // Peanut-encoded token (🥜 + variation selectors)
+    if (PeanutCodec.isPeanut(trimmed)) {
+      final decoded = PeanutCodec.decode(trimmed);
+      if (decoded != null) {
+        return parse(decoded);
+      }
+    }
+
     final lower = trimmed.toLowerCase();
 
     // Token Cashu (cashuA... o cashuB...)

lib/core/utils/peanut_codec.dart

@@ -0,0 +1,62 @@
+/// Peanut encoding/decoding for Cashu tokens.
+///
+/// Encodes Cashu tokens into invisible Unicode Variation Selectors
+/// appended to a 🥜 emoji, compatible with cashu.me's implementation.
+///
+/// Each character of the base64 token is mapped to a Variation Selector:
+/// - charCode 0-15  → VS1-VS16 (U+FE00 to U+FE0F)
+/// - charCode 16-255 → VS17-VS256 (U+E0100 to U+E01EF)
+class PeanutCodec {
+  static const String _peanutEmoji = '🥜';
+
+  /// Encodes a Cashu token string into peanut format (🥜 + variation selectors).
+  static String encode(String token) {
+    final buffer = StringBuffer(_peanutEmoji);
+
+    for (int i = 0; i < token.length; i++) {
+      final byte = token.codeUnitAt(i);
+
+      if (byte < 16) {
+        // VS1-VS16: U+FE00 to U+FE0F
+        buffer.writeCharCode(0xFE00 + byte);
+      } else if (byte < 256) {
+        // VS17-VS256: U+E0100 to U+E01EF
+        buffer.writeCharCode(0xE0100 + (byte - 16));
+      }
+    }
+
+    return buffer.toString();
+  }
+
+  /// Decodes a peanut-encoded string back to the original Cashu token.
+  /// Returns null if the input is not valid peanut format.
+  static String? decode(String peanut) {
+    final trimmed = peanut.trimLeft();
+    if (!trimmed.startsWith(_peanutEmoji)) return null;
+
+    final buffer = StringBuffer();
+    final runes = trimmed.runes.toList();
+
+    // Skip the first rune (🥜 emoji)
+    for (int i = 1; i < runes.length; i++) {
+      final codePoint = runes[i];
+
+      if (codePoint >= 0xFE00 && codePoint <= 0xFE0F) {
+        // VS1-VS16 → byte 0-15
+        buffer.writeCharCode(codePoint - 0xFE00);
+      } else if (codePoint >= 0xE0100 && codePoint <= 0xE01EF) {
+        // VS17-VS256 → byte 16-255
+        buffer.writeCharCode(codePoint - 0xE0100 + 16);
+      }
+      // Skip any other characters (whitespace, etc.)
+    }
+
+    final result = buffer.toString();
+    return result.isNotEmpty ? result : null;
+  }
+
+  /// Returns true if the string starts with the 🥜 emoji.
+  static bool isPeanut(String data) {
+    return data.trimLeft().startsWith(_peanutEmoji);
+  }
+}

lib/l10n/app_de.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "Bewahre diesen Token auf, bis der Empfänger ihn einlöst. Wenn du ihn verlierst, verlierst du die Mittel.",
   "tokenCopiedToClipboard": "Token in Zwischenablage kopiert",
+  "copyAsEmoji": "Als Emoji kopieren",
+  "emojiCopiedToClipboard": "Token als Emoji kopiert 🥜",
+  "peanutDecodeError": "Emoji-Token konnte nicht dekodiert werden. Möglicherweise beschädigt.",
 
   "amountToDeposit": "Einzuzahlender Betrag:",
   "descriptionOptional": "Beschreibung (optional):",

lib/l10n/app_en.arb

@@ -112,6 +112,9 @@
   "tokenCashuAnimatedQr": "Cashu Token (animated QR - {fragments} UR fragments)",
   "keepTokenWarning": "Keep this token until the recipient claims it. If you lose it, you will lose the funds.",
   "tokenCopiedToClipboard": "Token copied to clipboard",
+  "copyAsEmoji": "Copy as emoji",
+  "emojiCopiedToClipboard": "Token copied as emoji 🥜",
+  "peanutDecodeError": "Could not decode emoji token. It may be corrupted.",
 
   "amountToDeposit": "Amount to deposit:",
   "descriptionOptional": "Description (optional):",

lib/l10n/app_es.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "Guarda este token hasta que el receptor lo reclame. Si lo pierdes, perderás los fondos.",
   "tokenCopiedToClipboard": "Token copiado al portapapeles",
+  "copyAsEmoji": "Copiar como emoji",
+  "emojiCopiedToClipboard": "Token copiado como emoji 🥜",
+  "peanutDecodeError": "No se pudo decodificar el token emoji. Puede estar corrupto.",
 
   "amountToDeposit": "Monto a depositar:",
   "descriptionOptional": "Descripción (opcional):",

lib/l10n/app_fr.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "Conservez ce token jusqu'à ce que le destinataire le réclame. Si vous le perdez, vous perdrez les fonds.",
   "tokenCopiedToClipboard": "Token copié dans le presse-papiers",
+  "copyAsEmoji": "Copier en emoji",
+  "emojiCopiedToClipboard": "Token copié en emoji 🥜",
+  "peanutDecodeError": "Impossible de décoder le token emoji. Il est peut-être corrompu.",
 
   "amountToDeposit": "Montant à déposer :",
   "descriptionOptional": "Description (optionnelle) :",

lib/l10n/app_it.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "Conserva questo token finché il destinatario non lo riscatta. Se lo perdi, perderai i fondi.",
   "tokenCopiedToClipboard": "Token copiato negli appunti",
+  "copyAsEmoji": "Copia come emoji",
+  "emojiCopiedToClipboard": "Token copiato come emoji 🥜",
+  "peanutDecodeError": "Impossibile decodificare il token emoji. Potrebbe essere corrotto.",
 
   "amountToDeposit": "Importo da depositare:",
   "descriptionOptional": "Descrizione (opzionale):",

lib/l10n/app_ja.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "受取人が請求するまでこのトークンを保管してください。紛失すると資金を失います。",
   "tokenCopiedToClipboard": "トークンをクリップボードにコピーしました",
+  "copyAsEmoji": "絵文字としてコピー",
+  "emojiCopiedToClipboard": "トークンを絵文字としてコピーしました 🥜",
+  "peanutDecodeError": "絵文字トークンをデコードできませんでした。破損している可能性があります。",
 
   "amountToDeposit": "入金額：",
   "descriptionOptional": "説明（任意）：",

lib/l10n/app_ko.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "수신자가 청구할 때까지 이 토큰을 보관하세요. 분실하면 자금을 잃게 됩니다.",
   "tokenCopiedToClipboard": "토큰이 클립보드에 복사되었습니다",
+  "copyAsEmoji": "이모지로 복사",
+  "emojiCopiedToClipboard": "토큰이 이모지로 복사되었습니다 🥜",
+  "peanutDecodeError": "이모지 토큰을 디코딩할 수 없습니다. 손상되었을 수 있습니다.",
 
   "amountToDeposit": "입금할 금액:",
   "descriptionOptional": "설명 (선택사항):",

lib/l10n/app_localizations.dart

@@ -707,6 +707,24 @@ abstract class L10n {
   /// **'Token copiado al portapapeles'**
   String get tokenCopiedToClipboard;
 
+  /// No description provided for @copyAsEmoji.
+  ///
+  /// In es, this message translates to:
+  /// **'Copiar como emoji'**
+  String get copyAsEmoji;
+
+  /// No description provided for @emojiCopiedToClipboard.
+  ///
+  /// In es, this message translates to:
+  /// **'Token copiado como emoji 🥜'**
+  String get emojiCopiedToClipboard;
+
+  /// No description provided for @peanutDecodeError.
+  ///
+  /// In es, this message translates to:
+  /// **'No se pudo decodificar el token emoji. Puede estar corrupto.'**
+  String get peanutDecodeError;
+
   /// No description provided for @amountToDeposit.
   ///
   /// In es, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -315,6 +315,15 @@ class L10nDe extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Token in Zwischenablage kopiert';
 
+  @override
+  String get copyAsEmoji => 'Als Emoji kopieren';
+
+  @override
+  String get emojiCopiedToClipboard => 'Token als Emoji kopiert 🥜';
+
+  @override
+  String get peanutDecodeError => 'Emoji-Token konnte nicht dekodiert werden. Möglicherweise beschädigt.';
+
   @override
   String get amountToDeposit => 'Einzuzahlender Betrag:';
 

lib/l10n/app_localizations_en.dart

@@ -315,6 +315,15 @@ class L10nEn extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Token copied to clipboard';
 
+  @override
+  String get copyAsEmoji => 'Copy as emoji';
+
+  @override
+  String get emojiCopiedToClipboard => 'Token copied as emoji 🥜';
+
+  @override
+  String get peanutDecodeError => 'Could not decode emoji token. It may be corrupted.';
+
   @override
   String get amountToDeposit => 'Amount to deposit:';
 

lib/l10n/app_localizations_es.dart

@@ -315,6 +315,15 @@ class L10nEs extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Token copiado al portapapeles';
 
+  @override
+  String get copyAsEmoji => 'Copiar como emoji';
+
+  @override
+  String get emojiCopiedToClipboard => 'Token copiado como emoji 🥜';
+
+  @override
+  String get peanutDecodeError => 'No se pudo decodificar el token emoji. Puede estar corrupto.';
+
   @override
   String get amountToDeposit => 'Monto a depositar:';
 

lib/l10n/app_localizations_fr.dart

@@ -315,6 +315,15 @@ class L10nFr extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Token copié dans le presse-papiers';
 
+  @override
+  String get copyAsEmoji => 'Copier en emoji';
+
+  @override
+  String get emojiCopiedToClipboard => 'Token copié en emoji 🥜';
+
+  @override
+  String get peanutDecodeError => 'Impossible de décoder le token emoji. Il est peut-être corrompu.';
+
   @override
   String get amountToDeposit => 'Montant à déposer :';
 

lib/l10n/app_localizations_it.dart

@@ -315,6 +315,15 @@ class L10nIt extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Token copiato negli appunti';
 
+  @override
+  String get copyAsEmoji => 'Copia come emoji';
+
+  @override
+  String get emojiCopiedToClipboard => 'Token copiato come emoji 🥜';
+
+  @override
+  String get peanutDecodeError => 'Impossibile decodificare il token emoji. Potrebbe essere corrotto.';
+
   @override
   String get amountToDeposit => 'Importo da depositare:';
 

lib/l10n/app_localizations_ja.dart

@@ -315,6 +315,15 @@ class L10nJa extends L10n {
   @override
   String get tokenCopiedToClipboard => 'トークンをクリップボードにコピーしました';
 
+  @override
+  String get copyAsEmoji => '絵文字としてコピー';
+
+  @override
+  String get emojiCopiedToClipboard => 'トークンを絵文字としてコピーしました 🥜';
+
+  @override
+  String get peanutDecodeError => '絵文字トークンをデコードできませんでした。破損している可能性があります。';
+
   @override
   String get amountToDeposit => '入金額：';
 

lib/l10n/app_localizations_ko.dart

@@ -315,6 +315,15 @@ class L10nKo extends L10n {
   @override
   String get tokenCopiedToClipboard => '토큰이 클립보드에 복사되었습니다';
 
+  @override
+  String get copyAsEmoji => '이모지로 복사';
+
+  @override
+  String get emojiCopiedToClipboard => '토큰이 이모지로 복사되었습니다 🥜';
+
+  @override
+  String get peanutDecodeError => '이모지 토큰을 디코딩할 수 없습니다. 손상되었을 수 있습니다.';
+
   @override
   String get amountToDeposit => '입금할 금액:';
 

lib/l10n/app_localizations_pt.dart

@@ -315,6 +315,15 @@ class L10nPt extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Token copiado para área de transferência';
 
+  @override
+  String get copyAsEmoji => 'Copiar como emoji';
+
+  @override
+  String get emojiCopiedToClipboard => 'Token copiado como emoji 🥜';
+
+  @override
+  String get peanutDecodeError => 'Não foi possível decodificar o token emoji. Pode estar corrompido.';
+
   @override
   String get amountToDeposit => 'Valor a depositar:';
 

lib/l10n/app_localizations_ru.dart

@@ -315,6 +315,15 @@ class L10nRu extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Токен скопирован в буфер обмена';
 
+  @override
+  String get copyAsEmoji => 'Скопировать как эмодзи';
+
+  @override
+  String get emojiCopiedToClipboard => 'Токен скопирован как эмодзи 🥜';
+
+  @override
+  String get peanutDecodeError => 'Не удалось декодировать эмодзи-токен. Возможно, он повреждён.';
+
   @override
   String get amountToDeposit => 'Сумма для пополнения:';
 

lib/l10n/app_localizations_sw.dart

@@ -315,6 +315,15 @@ class L10nSw extends L10n {
   @override
   String get tokenCopiedToClipboard => 'Tokeni imenakiliwa kwenye ubao';
 
+  @override
+  String get copyAsEmoji => 'Nakili kama emoji';
+
+  @override
+  String get emojiCopiedToClipboard => 'Tokeni imenakiliwa kama emoji 🥜';
+
+  @override
+  String get peanutDecodeError => 'Imeshindwa kusimbua tokeni ya emoji. Inaweza kuwa imeharibika.';
+
   @override
   String get amountToDeposit => 'Kiasi cha kuweka:';
 

lib/l10n/app_localizations_zh.dart

@@ -315,6 +315,15 @@ class L10nZh extends L10n {
   @override
   String get tokenCopiedToClipboard => '代币已复制到剪贴板';
 
+  @override
+  String get copyAsEmoji => '复制为表情符号';
+
+  @override
+  String get emojiCopiedToClipboard => '代币已复制为表情符号 🥜';
+
+  @override
+  String get peanutDecodeError => '无法解码表情符号代币。可能已损坏。';
+
   @override
   String get amountToDeposit => '存入金额：';
 

lib/l10n/app_pt.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "Guarde este token até que o destinatário o resgate. Se você perdê-lo, perderá os fundos.",
   "tokenCopiedToClipboard": "Token copiado para área de transferência",
+  "copyAsEmoji": "Copiar como emoji",
+  "emojiCopiedToClipboard": "Token copiado como emoji 🥜",
+  "peanutDecodeError": "Não foi possível decodificar o token emoji. Pode estar corrompido.",
 
   "amountToDeposit": "Valor a depositar:",
   "descriptionOptional": "Descrição (opcional):",

lib/l10n/app_ru.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "Сохраните этот токен, пока получатель не заберёт его. Если потеряете — потеряете средства.",
   "tokenCopiedToClipboard": "Токен скопирован в буфер обмена",
+  "copyAsEmoji": "Скопировать как эмодзи",
+  "emojiCopiedToClipboard": "Токен скопирован как эмодзи 🥜",
+  "peanutDecodeError": "Не удалось декодировать эмодзи-токен. Возможно, он повреждён.",
 
   "amountToDeposit": "Сумма для пополнения:",
   "descriptionOptional": "Описание (необязательно):",

lib/l10n/app_sw.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "Hifadhi tokeni hii hadi mpokeaji aidai. Ukiipoteza, utapoteza fedha.",
   "tokenCopiedToClipboard": "Tokeni imenakiliwa kwenye ubao",
+  "copyAsEmoji": "Nakili kama emoji",
+  "emojiCopiedToClipboard": "Tokeni imenakiliwa kama emoji 🥜",
+  "peanutDecodeError": "Imeshindwa kusimbua tokeni ya emoji. Inaweza kuwa imeharibika.",
 
   "amountToDeposit": "Kiasi cha kuweka:",
   "descriptionOptional": "Maelezo (si lazima):",

lib/l10n/app_zh.arb

@@ -137,6 +137,9 @@
   },
   "keepTokenWarning": "请保留此代币直到收款方领取。如果丢失，资金将无法找回。",
   "tokenCopiedToClipboard": "代币已复制到剪贴板",
+  "copyAsEmoji": "复制为表情符号",
+  "emojiCopiedToClipboard": "代币已复制为表情符号 🥜",
+  "peanutDecodeError": "无法解码表情符号代币。可能已损坏。",
 
   "amountToDeposit": "存入金额：",
   "descriptionOptional": "描述（可选）：",

lib/screens/4_receive/receive_screen.dart

@@ -8,6 +8,7 @@ import '../../core/constants/dimensions.dart';
 import '../../core/utils/formatters.dart';
 import '../../core/utils/incoming_data_parser.dart' hide TokenInfo;
 import '../../core/utils/nostr_utils.dart';
+import '../../core/utils/peanut_codec.dart';
 import '../../widgets/common/gradient_background.dart';
 import '../../widgets/common/glass_card.dart';
 import '../../widgets/common/primary_button.dart';
@@ -779,9 +780,29 @@ class _ReceiveScreenState extends State<ReceiveScreen> {
 
   Future<void> _pasteFromClipboard() async {
     final clipboardData = await Clipboard.getData(Clipboard.kTextPlain);
+    if (!mounted) return;
     if (clipboardData?.text != null) {
-      _tokenController.text = clipboardData!.text!.trim();
-      _onTokenChanged(clipboardData.text!.trim());
+      var text = clipboardData!.text!.trim();
+
+      // Auto-decode peanut emoji format
+      if (PeanutCodec.isPeanut(text)) {
+        final decoded = PeanutCodec.decode(text);
+        if (decoded != null) {
+          text = decoded;
+        } else {
+          // Malformed peanut: clear field and show specific error
+          _tokenController.clear();
+          setState(() {
+            _isValidToken = false;
+            _tokenInfo = null;
+            _errorMessage = L10n.of(context)!.peanutDecodeError;
+          });
+          return;
+        }
+      }
+
+      _tokenController.text = text;
+      _onTokenChanged(text);
     }
   }
 
@@ -789,6 +810,28 @@ class _ReceiveScreenState extends State<ReceiveScreen> {
     final walletProvider = context.read<WalletProvider>();
     final p2pkProvider = context.read<P2PKProvider>();
 
+    // Auto-decode peanut emoji format
+    var tokenValue = value.trim();
+    if (PeanutCodec.isPeanut(tokenValue)) {
+      final decoded = PeanutCodec.decode(tokenValue);
+      if (decoded != null) {
+        tokenValue = decoded;
+        // Update the text field with the decoded token
+        _tokenController.text = tokenValue;
+        _tokenController.selection = TextSelection.collapsed(
+          offset: tokenValue.length,
+        );
+      } else {
+        // Malformed peanut: show specific error
+        setState(() {
+          _isValidToken = false;
+          _tokenInfo = null;
+          _errorMessage = L10n.of(context)!.peanutDecodeError;
+        });
+        return;
+      }
+    }
+
     setState(() {
       _errorMessage = null;
       _manualKeyError = null;
@@ -799,24 +842,24 @@ class _ReceiveScreenState extends State<ReceiveScreen> {
       _lockedToPubkeyHex = null;
       _matchingKeyLabel = null;
 
-      if (value.isEmpty) {
+      if (tokenValue.isEmpty) {
         _isValidToken = false;
         _tokenInfo = null;
         return;
       }
 
       // Parsear token real con cdk-flutter
-      final tokenInfo = walletProvider.parseToken(value.trim());
+      final tokenInfo = walletProvider.parseToken(tokenValue);
 
       if (tokenInfo != null) {
         _isValidToken = true;
         _tokenInfo = tokenInfo;
 
         // Detectar P2PK
-        _isP2PKLocked = p2pkProvider.isTokenLocked(value.trim());
+        _isP2PKLocked = p2pkProvider.isTokenLocked(tokenValue);
         if (_isP2PKLocked) {
-          _lockedToPubkeyHex = p2pkProvider.extractLockedPubkey(value.trim());
-          _isLockedToUs = p2pkProvider.isTokenLockedToUs(value.trim());
+          _lockedToPubkeyHex = p2pkProvider.extractLockedPubkey(tokenValue);
+          _isLockedToUs = p2pkProvider.isTokenLockedToUs(tokenValue);
 
           // Si es nuestra, buscar el label de la clave
           if (_isLockedToUs && _lockedToPubkeyHex != null) {

lib/screens/5_send/share_token_screen.dart

@@ -9,6 +9,7 @@ import 'package:elcaju/l10n/app_localizations.dart';
 import '../../core/constants/colors.dart';
 import '../../core/constants/dimensions.dart';
 import '../../core/utils/formatters.dart';
+import '../../core/utils/peanut_codec.dart';
 import '../../widgets/common/gradient_background.dart';
 import '../../widgets/common/glass_card.dart';
 import '../../widgets/common/primary_button.dart';
@@ -414,7 +415,27 @@ class _ShareTokenScreenState extends State<ShareTokenScreen> {
             ),
           ),
         ),
-        const SizedBox(width: AppDimensions.paddingMedium),
+        const SizedBox(width: AppDimensions.paddingSmall),
+        // Copiar como emoji (peanut encoding)
+        Tooltip(
+          message: L10n.of(context)!.copyAsEmoji,
+          child: GestureDetector(
+            onTap: () => _copyPeanut(context),
+            child: Container(
+              padding: const EdgeInsets.all(16),
+              decoration: BoxDecoration(
+                color: Colors.white.withValues(alpha: 0.1),
+                borderRadius: BorderRadius.circular(16),
+                border: Border.all(
+                  color: Colors.white.withValues(alpha: 0.2),
+                  width: 1,
+                ),
+              ),
+              child: Icon(LucideIcons.bean, color: AppColors.primaryAction, size: 22),
+            ),
+          ),
+        ),
+        const SizedBox(width: AppDimensions.paddingSmall),
         // Compartir
         Expanded(
           child: GestureDetector(
@@ -492,6 +513,19 @@ class _ShareTokenScreenState extends State<ShareTokenScreen> {
     );
   }
 
+  void _copyPeanut(BuildContext context) {
+    final peanut = PeanutCodec.encode(widget.token);
+    Clipboard.setData(ClipboardData(text: peanut));
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(L10n.of(context)!.emojiCopiedToClipboard),
+        backgroundColor: AppColors.success,
+        behavior: SnackBarBehavior.floating,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
+      ),
+    );
+  }
+
   void _shareToken(BuildContext context) async {
     final memo = widget.memo != null && widget.memo!.isNotEmpty
         ? '\n"${widget.memo}"'