feat(token_validation): Improve flow for adding new tokens across wallets

This change:
- Implements check to see if a token is already added, preventing duplicates
- Triggers dialog warning if its a duplicate token
- Takes EVM Chains contract adddress case-insensitivity when making checks for potential scams.

cw_evm/lib/evm_chain_wallet.dart

@@ -197,8 +197,8 @@ abstract class EVMChainWalletBase
     for (var token in erc20Currencies) {
       bool isPotentialScam = false;
 
-      bool isWhitelisted =
-          getDefaultTokenContractAddresses.any((element) => element == token.contractAddress);
+      bool isWhitelisted = getDefaultTokenContractAddresses
+          .any((element) => element.toLowerCase() == token.contractAddress.toLowerCase());
 
       final tokenSymbol = token.title.toUpperCase();
 
@@ -213,6 +213,16 @@ abstract class EVMChainWalletBase
         token.iconPath = null;
         await token.save();
       }
+
+      // For fixing wrongly classified tokens
+      if (!isPotentialScam && token.isPotentialScam) {
+        token.isPotentialScam = false;
+        final iconPath = CryptoCurrency.all
+            .firstWhere((element) => element.title.toUpperCase() == token.symbol.toUpperCase())
+            .iconPath;
+        token.iconPath = iconPath;
+        await token.save();
+      }
     }
   }
 
@@ -654,6 +664,11 @@ abstract class EVMChainWalletBase
   List<Erc20Token> get erc20Currencies => evmChainErc20TokensBox.values.toList();
 
   Future<void> addErc20Token(Erc20Token token) async {
+    if (evmChainErc20TokensBox.values.any((element) =>
+        element.contractAddress.toLowerCase() == token.contractAddress.toLowerCase())) {
+      throw Exception('Token already exists');
+    }
+
     String? iconPath;
 
     if ((token.iconPath == null || token.iconPath!.isEmpty) && !token.isPotentialScam) {

lib/ethereum/cw_ethereum.dart

@@ -212,4 +212,11 @@ class CWEthereum extends Ethereum {
   List<String> getDefaultTokenContractAddresses() {
     return DefaultEthereumErc20Tokens().initialErc20Tokens.map((e) => e.contractAddress).toList();
   }
+
+
+  @override
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress) {
+    final ethereumWallet = wallet as EthereumWallet;
+    return ethereumWallet.erc20Currencies.any((element) => element.contractAddress.toLowerCase() == contractAddress.toLowerCase());
+  }
 }

lib/polygon/cw_polygon.dart

@@ -211,4 +211,10 @@ class CWPolygon extends Polygon {
   List<String> getDefaultTokenContractAddresses() {
     return DefaultPolygonErc20Tokens().initialPolygonErc20Tokens.map((e) => e.contractAddress).toList();
   }
+
+  @override
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress) {
+    final polygonWallet = wallet as PolygonWallet;
+    return polygonWallet.erc20Currencies.any((element) => element.contractAddress.toLowerCase() == contractAddress.toLowerCase());
+  }
 }

lib/solana/cw_solana.dart

@@ -155,4 +155,10 @@ class CWSolana extends Solana {
   List<String> getDefaultTokenContractAddresses() {
     return DefaultSPLTokens().initialSPLTokens.map((e) => e.mintAddress).toList();
   }
+
+  @override
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress) {
+    final solanaWallet = wallet as SolanaWallet;
+    return solanaWallet.splTokenCurrencies.any((element) => element.mintAddress == contractAddress);
+  }
 }

lib/src/screens/dashboard/edit_token_page.dart

@@ -200,6 +200,23 @@ class _EditTokenPageBodyState extends State<EditTokenPageBody> {
                         onPressed: () async {
                           if (_formKey.currentState!.validate() &&
                               (!_showDisclaimer || _disclaimerChecked)) {
+                            final isTokenAlreadyAdded = await widget.homeSettingsViewModel
+                                .checkIfTokenIsAlreadyAdded(_contractAddressController.text);
+                            if (isTokenAlreadyAdded) {
+                              showPopUp<void>(
+                                context: context,
+                                builder: (dialogContext) {
+                                  return AlertWithOneAction(
+                                    alertTitle: S.current.warning,
+                                    alertContent: S.of(context).token_already_exists,
+                                    buttonText: S.of(context).ok,
+                                    buttonAction: () => Navigator.of(dialogContext).pop(),
+                                  );
+                                },
+                              );
+                              return;
+                            }
+                            
                             final isWhitelisted = await widget.homeSettingsViewModel
                                 .checkIfTokenIsWhitelisted(_contractAddressController.text);
 

lib/tron/cw_tron.dart

@@ -138,4 +138,10 @@ class CWTron extends Tron {
   List<String> getDefaultTokenContractAddresses() {
     return DefaultTronTokens().initialTronTokens.map((e) => e.contractAddress).toList();
   }
+
+  @override
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress) {
+    final tronWallet = wallet as TronWallet;
+    return tronWallet.tronTokenCurrencies.any((element) => element.contractAddress == contractAddress);
+  }
 }

lib/view_model/dashboard/home_settings_view_model.dart

@@ -126,6 +126,31 @@ abstract class HomeSettingsViewModelBase with Store {
     }
   }
 
+  @action
+  Future<bool> checkIfTokenIsAlreadyAdded(String contractAddress) async {
+    if (_balanceViewModel.wallet.type == WalletType.ethereum) {
+      return ethereum!.isTokenAlreadyAdded(_balanceViewModel.wallet, contractAddress);
+    }
+
+    if (_balanceViewModel.wallet.type == WalletType.polygon) {
+      return polygon!.isTokenAlreadyAdded(_balanceViewModel.wallet, contractAddress);
+    }
+
+    if (_balanceViewModel.wallet.type == WalletType.solana) {
+      return solana!.isTokenAlreadyAdded(_balanceViewModel.wallet, contractAddress);
+    }
+
+    if (_balanceViewModel.wallet.type == WalletType.tron) {
+      return tron!.isTokenAlreadyAdded(_balanceViewModel.wallet, contractAddress);
+    }
+
+    if (_balanceViewModel.wallet.type == WalletType.zano) {
+      return zano!.isTokenAlreadyAdded(_balanceViewModel.wallet, contractAddress);
+    }
+
+    return false;
+  }
+
   @action
   Future<void> deleteToken(CryptoCurrency token) async {
     try {
@@ -297,7 +322,7 @@ abstract class HomeSettingsViewModelBase with Store {
     required bool isEthereum,
   }) async {
     final uri = Uri.https(
-       "api.etherscan.io",
+      "api.etherscan.io",
       "/v2/api",
       {
         "chainid": isEthereum ? "1" : "137",

lib/zano/cw_zano.dart

@@ -136,4 +136,10 @@ class CWZano extends Zano {
   Map<String, List<int>> debugCallLength() {
     return api.debugCallLength();
   }
+
+  @override
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress) {
+    final zanoWallet = wallet as ZanoWallet;
+    return zanoWallet.zanoAssets.values.any((element) => element?.assetId == contractAddress);
+  }
 }

res/values/strings_ar.arb

@@ -899,6 +899,7 @@
   "tip": "بقشيش:",
   "to": "ل",
   "today": "اليوم",
+  "token_already_exists": "رمز موجود بالفعل",
   "token_contract_address": "عنوان عقد الرمز",
   "token_decimal": "رمز عشري",
   "token_name": "اسم الرمز ، على سبيل المثال: Tether",

res/values/strings_bg.arb

@@ -899,6 +899,7 @@
   "tip": "Tip:",
   "to": "Да",
   "today": "Днес",
+  "token_already_exists": "Токена вече съществува",
   "token_contract_address": "Адрес на токен договор",
   "token_decimal": "Токен десетичен",
   "token_name": "Име на токена, напр.: Tether",

res/values/strings_cs.arb

@@ -899,6 +899,7 @@
   "tip": "Spropitné:",
   "to": "Na",
   "today": "Dnes",
+  "token_already_exists": "Token již existuje",
   "token_contract_address": "Adresa tokenové smlouvy",
   "token_decimal": "Token v desítkové soustavě",
   "token_name": "Název tokenu např.: Tether",

res/values/strings_de.arb

@@ -900,6 +900,7 @@
   "tip": "Hinweis:",
   "to": "Zu",
   "today": "Heute",
+  "token_already_exists": "Token existiert bereits",
   "token_contract_address": "Token-Contract-Adresse",
   "token_decimal": "Token-Dezimalzahl",
   "token_name": "Token-Name, z. B.: Tether",

res/values/strings_en.arb

@@ -900,6 +900,7 @@
   "tip": "Tip:",
   "to": "To",
   "today": "Today",
+  "token_already_exists": "Token already exists",
   "token_contract_address": "Token contract address",
   "token_decimal": "Token decimal",
   "token_name": "Token name eg: Tether",

res/values/strings_es.arb

@@ -900,6 +900,7 @@
   "tip": "Consejo:",
   "to": "A",
   "today": "Hoy",
+  "token_already_exists": "Token ya existe",
   "token_contract_address": "Dirección de contrato de token",
   "token_decimal": "Token decimal",
   "token_name": "Nombre del token, por ejemplo: Tether",

res/values/strings_fr.arb

@@ -899,6 +899,7 @@
   "tip": "Pourboire:",
   "to": "À",
   "today": "Aujourd'hui",
+  "token_already_exists": "Le jeton existe déjà",
   "token_contract_address": "Adresse du contrat de token",
   "token_decimal": "Décimales de token",
   "token_name": "Nom du token, par exemple : Tether",

res/values/strings_ha.arb

@@ -901,6 +901,7 @@
   "tip": "Tukwici:",
   "to": "Zuwa",
   "today": "Yau",
+  "token_already_exists": "Alama an riga an wanzu",
   "token_contract_address": "Adireshin kwangilar Token",
   "token_decimal": "Alamar ƙima",
   "token_name": "Alamar sunan misali: Tether",

res/values/strings_hi.arb

@@ -901,6 +901,7 @@
   "tip": "टिप:",
   "to": "को",
   "today": "आज",
+  "token_already_exists": "टोकन पहले से मौजूद है",
   "token_contract_address": "टोकन अनुबंध पता",
   "token_decimal": "सांकेतिक दशमलव",
   "token_name": "टोकन नाम जैसे: टीथर",

res/values/strings_hr.arb

@@ -899,6 +899,7 @@
   "tip": "Savjet:",
   "to": "Do",
   "today": "Danas",
+  "token_already_exists": "Token već postoji",
   "token_contract_address": "Adresa ugovora tokena",
   "token_decimal": "Token decimalni",
   "token_name": "Naziv tokena npr.: Tether",

res/values/strings_hy.arb

@@ -897,6 +897,7 @@
   "tip": "Թեյավճար",
   "to": "Դեպի",
   "today": "Այսօր",
+  "token_already_exists": "Նշանն արդեն գոյություն ունի",
   "token_contract_address": "Token-ի պայմանագրի հասցե",
   "token_decimal": "Token-ի տասանիշ",
   "token_name": "Token-ի անուն, օրինակ՝ Tether",

res/values/strings_id.arb

@@ -902,6 +902,7 @@
   "tip": "Tip:",
   "to": "Ke",
   "today": "Hari ini",
+  "token_already_exists": "Token sudah ada",
   "token_contract_address": "Alamat kontrak token",
   "token_decimal": "Desimal token",
   "token_name": "Nama token misalnya: Tether",

res/values/strings_it.arb

@@ -900,6 +900,7 @@
   "tip": "Suggerimento:",
   "to": "A",
   "today": "Oggi",
+  "token_already_exists": "Il token esiste già",
   "token_contract_address": "Indirizzo del contratto token",
   "token_decimal": "Decimale del token",
   "token_name": "Nome del token, ad esempio: Tether",

res/values/strings_ja.arb

@@ -900,6 +900,7 @@
   "tip": "ヒント: ",
   "to": "に",
   "today": "今日",
+  "token_already_exists": "トークンはすでに存在します",
   "token_contract_address": "トークンコントラクトアドレス",
   "token_decimal": "トークン10進数",
   "token_name": "トークン名 例: Tether",

res/values/strings_ko.arb

@@ -900,6 +900,7 @@
   "tip": "팁:",
   "to": "받는 통화",
   "today": "오늘",
+  "token_already_exists": "토큰이 이미 존재합니다",
   "token_contract_address": "토큰 계약 주소",
   "token_decimal": "토큰 소수 자릿수",
   "token_name": "토큰 이름 (예: Tether)",

res/values/strings_my.arb

@@ -899,6 +899,7 @@
   "tip": "အကြံပြုချက်-",
   "to": "သို့",
   "today": "ဒီနေ့",
+  "token_already_exists": "တိုကင်ရှိပြီးသား",
   "token_contract_address": "တိုကင်စာချုပ်လိပ်စာ",
   "token_decimal": "တိုကင်ဒဿမ",
   "token_name": "တိုကင်အမည် ဥပမာ- Tether",

res/values/strings_nl.arb

@@ -899,6 +899,7 @@
   "tip": "Tip:",
   "to": "Naar",
   "today": "Vandaag",
+  "token_already_exists": "Token bestaat al",
   "token_contract_address": "Token contractadres",
   "token_decimal": "Token decimaal",
   "token_name": "Tokennaam bijv.: Tether",

res/values/strings_pl.arb

@@ -899,6 +899,7 @@
   "tip": "tip:",
   "to": "Do",
   "today": "Dzisiaj",
+  "token_already_exists": "Token już istnieje",
   "token_contract_address": "Adres kontraktu tokena",
   "token_decimal": "Token dziesiętny",
   "token_name": "Nazwa tokena, np.: Tether",

res/values/strings_pt.arb

@@ -901,6 +901,7 @@
   "tip": "Dica:",
   "to": "Para",
   "today": "Hoje",
+  "token_already_exists": "Token já existe",
   "token_contract_address": "Endereço do contrato de token",
   "token_decimal": "Token decimal",
   "token_name": "Nome do token, por exemplo: Tether",

res/values/strings_ru.arb

@@ -900,6 +900,7 @@
   "tip": "Совет:",
   "to": "К",
   "today": "Сегодня",
+  "token_already_exists": "Токен уже существует",
   "token_contract_address": "Адрес контракта токена",
   "token_decimal": "Десятичный токен",
   "token_name": "Имя токена, например: Tether",

res/values/strings_th.arb

@@ -899,6 +899,7 @@
   "tip": "เพิ่มค่าตอบแทน:",
   "to": "ถึง",
   "today": "วันนี้",
+  "token_already_exists": "โทเค็นมีอยู่แล้ว",
   "token_contract_address": "ที่อยู่สัญญาโทเค็น",
   "token_decimal": "โทเค็นทศนิยม",
   "token_name": "ชื่อโทเค็น เช่น Tether",

res/values/strings_tl.arb

@@ -899,6 +899,7 @@
   "tip": "Tip:",
   "to": "Sa",
   "today": "Ngayon",
+  "token_already_exists": "Mayroon nang token",
   "token_contract_address": "Address ng token contract",
   "token_decimal": "Token decimal",
   "token_name": "Pangalan ng token, halimbawa: Tether",

res/values/strings_tr.arb

@@ -899,6 +899,7 @@
   "tip": "Bahşiş:",
   "to": "İle",
   "today": "Bugün",
+  "token_already_exists": "Token zaten var",
   "token_contract_address": "Token sözleşme adresi",
   "token_decimal": "Belirteç ondalık",
   "token_name": "Belirteç adı, örneğin: Tether",

res/values/strings_uk.arb

@@ -900,6 +900,7 @@
   "tip": "Порада:",
   "to": "До",
   "today": "Сьогодні",
+  "token_already_exists": "Маркер вже існує",
   "token_contract_address": "Адреса договору маркера",
   "token_decimal": "Токен десятковий",
   "token_name": "Назва токена, наприклад: Tether",

res/values/strings_ur.arb

@@ -901,6 +901,7 @@
   "tip": "ٹپ:",
   "to": "to",
   "today": "آج",
+  "token_already_exists": "ٹوکن پہلے ہی موجود ہے",
   "token_contract_address": "ٹوکن کنٹریکٹ ایڈریس",
   "token_decimal": "ٹوکن اعشاریہ",
   "token_name": "ٹوکن کا نام جیسے: Tether",

res/values/strings_vi.arb

@@ -896,6 +896,7 @@
   "tip": "Mẹo:",
   "to": "ĐẾN",
   "today": "Hôm nay",
+  "token_already_exists": "Mã thông báo đã tồn tại",
   "token_contract_address": "Địa chỉ hợp đồng token",
   "token_decimal": "Số thập phân của token",
   "token_name": "Tên token ví dụ: Tether",

res/values/strings_yo.arb

@@ -900,6 +900,7 @@
   "tip": "Owó àfikún:",
   "to": "Si",
   "today": "Lénìí",
+  "token_already_exists": "Token tẹlẹ wa",
   "token_contract_address": "Àmi guide adirẹsi",
   "token_decimal": "Àmi eleemewa",
   "token_name": "Orukọ àmi fun apẹẹrẹ: Tether",

res/values/strings_zh.arb

@@ -899,6 +899,7 @@
   "tip": "提示:",
   "to": "到",
   "today": "今天",
+  "token_already_exists": "令牌已经存在",
   "token_contract_address": "代币合约地址",
   "token_decimal": "令牌十进制",
   "token_name": "代币名称例如：Tether",

tool/configure.dart

@@ -748,6 +748,7 @@ abstract class Ethereum {
   void setLedgerConnection(WalletBase wallet, ledger.LedgerConnection connection);
   Future<List<HardwareAccountData>> getHardwareWalletAccounts(LedgerViewModel ledgerVM, {int index = 0, int limit = 5});
   List<String> getDefaultTokenContractAddresses();
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress);
 }
   """;
 
@@ -855,6 +856,7 @@ abstract class Polygon {
   void setLedgerConnection(WalletBase wallet, ledger.LedgerConnection connection);
   Future<List<HardwareAccountData>> getHardwareWalletAccounts(LedgerViewModel ledgerVM, {int index = 0, int limit = 5});
   List<String> getDefaultTokenContractAddresses();
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress);
 }
   """;
 
@@ -1141,6 +1143,7 @@ abstract class Solana {
   List<int>? getValidationLength(CryptoCurrency type);
   double? getEstimateFees(WalletBase wallet);
   List<String> getDefaultTokenContractAddresses();
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress);
 }
 
   """;
@@ -1219,6 +1222,7 @@ abstract class Tron {
   
   void updateTronGridUsageState(WalletBase wallet, bool isEnabled);
   List<String> getDefaultTokenContractAddresses();
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress);
 }
   """;
 
@@ -1293,6 +1297,7 @@ abstract class Zano {
   String getAddress(WalletBase wallet);
   bool validateAddress(String address);
   Map<String, List<int>> debugCallLength();
+  bool isTokenAlreadyAdded(WalletBase wallet, String contractAddress);
 }
 """;
   const zanoEmptyDefinition = 'Zano? zano;\n';