CW-608-Fetch-And-Save-Icons-Of-ERC20-And-SPL-Tokens-When-Adding-Them (#1365)

* feat: Fetch and save icons of SPL tokens when adding them

* feat: Implement fetch and save icons for ERC20 tokens when adding them

* fix: Add moralisApiKey to evm secrets

* Add check to ensure decimals cannot be zero

* - Fallback to adding erc20 token from web3dart
- Wrap fetching spl token icon in a try/catch block

---------

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

cw_evm/lib/evm_chain_client.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 import 'dart:developer';
 
 import 'package:cw_core/node.dart';
@@ -9,6 +10,7 @@ import 'package:cw_evm/evm_erc20_balance.dart';
 import 'package:cw_evm/evm_chain_transaction_model.dart';
 import 'package:cw_evm/pending_evm_chain_transaction.dart';
 import 'package:cw_evm/evm_chain_transaction_priority.dart';
+import 'package:cw_evm/.secrets.g.dart' as secrets;
 import 'package:flutter/services.dart';
 
 import 'package:http/http.dart';
@@ -211,26 +213,61 @@ abstract class EVMChainClient {
     return EVMChainERC20Balance(balance, exponent: exponent);
   }
 
-  Future<Erc20Token?> getErc20Token(String contractAddress) async {
+  Future<Erc20Token?> getErc20Token(String contractAddress, String chainName) async {
     try {
-      final erc20 = ERC20(address: EthereumAddress.fromHex(contractAddress), client: _client!);
-      final name = await erc20.name();
-      final symbol = await erc20.symbol();
-      final decimal = await erc20.decimals();
+      final uri = Uri.https(
+        'deep-index.moralis.io',
+        '/api/v2.2/erc20/metadata',
+        {
+          "chain": chainName,
+          "addresses": contractAddress,
+        },
+      );
+
+      final response = await httpClient.get(
+        uri,
+        headers: {
+          "Accept": "application/json",
+          "X-API-Key": secrets.moralisApiKey,
+        },
+      );
+
+      final decodedResponse = jsonDecode(response.body)[0] as Map<String, dynamic>;
+
+      final name = decodedResponse['name'] ?? '';
+      final symbol = decodedResponse['symbol'] ?? '';
+      final decimal = decodedResponse['decimals'] ?? '0';
+      final iconPath = decodedResponse['logo'] ?? '';
 
       return Erc20Token(
         name: name,
         symbol: symbol,
         contractAddress: contractAddress,
-        decimal: decimal.toInt(),
+        decimal: int.tryParse(decimal) ?? 0,
+        iconPath: iconPath,
       );
     } catch (e) {
+      try {
+        final erc20 = ERC20(address: EthereumAddress.fromHex(contractAddress), client: _client!);
+        final name = await erc20.name();
+        final symbol = await erc20.symbol();
+        final decimal = await erc20.decimals();
+
+        return Erc20Token(
+          name: name,
+          symbol: symbol,
+          contractAddress: contractAddress,
+          decimal: decimal.toInt(),
+        );
+      } catch (_) {}
+
       return null;
     }
   }
 
   Uint8List hexToBytes(String hexString) {
-    return Uint8List.fromList(hex.HEX.decode(hexString.startsWith('0x') ? hexString.substring(2) : hexString));
+    return Uint8List.fromList(
+        hex.HEX.decode(hexString.startsWith('0x') ? hexString.substring(2) : hexString));
   }
 
   void stop() {

cw_evm/lib/evm_chain_wallet.dart

@@ -439,11 +439,16 @@ abstract class EVMChainWalletBase
 
   Future<void> addErc20Token(Erc20Token token) async {
     String? iconPath;
-    try {
-      iconPath = CryptoCurrency.all
-          .firstWhere((element) => element.title.toUpperCase() == token.symbol.toUpperCase())
-          .iconPath;
-    } catch (_) {}
+
+    if (token.iconPath == null || token.iconPath!.isEmpty) {
+      try {
+        iconPath = CryptoCurrency.all
+            .firstWhere((element) => element.title.toUpperCase() == token.symbol.toUpperCase())
+            .iconPath;
+      } catch (_) {}
+    } else {
+      iconPath = token.iconPath;
+    }
 
     final newToken = createNewErc20TokenObject(token, iconPath);
 
@@ -466,8 +471,8 @@ abstract class EVMChainWalletBase
     _updateBalance();
   }
 
-  Future<Erc20Token?> getErc20Token(String contractAddress) async =>
-      await _client.getErc20Token(contractAddress);
+  Future<Erc20Token?> getErc20Token(String contractAddress, String chainName) async =>
+      await _client.getErc20Token(contractAddress, chainName);
 
   void _onNewTransaction() {
     _updateBalance();