fix: unhandledable session event exception

Directory.Build.props

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <DefaultVersion>2.4.0</DefaultVersion>
+    <DefaultVersion>2.4.1</DefaultVersion>
     <DefaultTargetFrameworks>net6.0;net7.0;net8.0;netstandard2.1;</DefaultTargetFrameworks>
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
   </PropertyGroup>

Tests/WalletConnectSharp.Web3Wallet.Tests/SignTests.cs

@@ -580,6 +580,10 @@ await Task.WhenAll(
 
             Assert.True(_dapp.TryUnsubscribeFromSessionEvent(referenceTypeEventData.Name, ReferenceTypeEventHandler));
             Assert.True(_dapp.TryUnsubscribeFromSessionEvent(valueTypeEventData.Name, ValueTypeEventHandler));
+
+            // Test invalid chains
+            await Assert.ThrowsAsync<FormatException>(() => _wallet.EmitSessionEvent(session.Topic, valueTypeEventData, "invalid chain"));
+            await Assert.ThrowsAsync<NamespacesException>(() => _wallet.EmitSessionEvent(session.Topic, valueTypeEventData, "123:321"));
         }
 
         [Fact, Trait("Category", "unit")]

WalletConnectSharp.Sign/Engine.cs

@@ -7,6 +7,7 @@
 using WalletConnectSharp.Common.Model.Errors;
 using WalletConnectSharp.Common.Model.Relay;
 using WalletConnectSharp.Common.Utils;
+using WalletConnectSharp.Core;
 using WalletConnectSharp.Core.Interfaces;
 using WalletConnectSharp.Core.Models;
 using WalletConnectSharp.Core.Models.Pairing;
@@ -818,6 +819,7 @@ public async Task Respond<T, TR>(string topic, JsonRpcResponse<TR> response)
         public async Task Emit<T>(string topic, EventData<T> eventData, string chainId = null)
         {
             IsInitialized();
+            await PrivateThis.IsValidEmit(topic, eventData, chainId);
             await MessageHandler.SendRequest<SessionEvent<T>, object>(topic,
                 new SessionEvent<T> { ChainId = chainId, Event = eventData, Topic = topic });
         }

WalletConnectSharp.Sign/Internals/EngineHandler.cs

@@ -352,6 +352,10 @@ async Task IEnginePrivate.OnSessionEventRequest(string topic, JsonRpcRequest<Ses
             {
                 await MessageHandler.SendError<SessionEvent<JToken>, bool>(id, topic, Error.FromException(e));
             }
+            catch (Exception e) // to avoid unhandled exceptions caused by invalid events sent by another peer
+            {
+                logger.LogError(e);
+            }
         }
     }
 }

WalletConnectSharp.Sign/Internals/EngineValidation.cs

@@ -344,7 +344,7 @@ private void ValidateNamespacesChainId(Namespaces namespaces, string chainId)
         {
             if (!Utils.IsValidChainId(chainId))
             {
-                throw new FormatException($"ChainId {chainId} should be a string and conform to 'chainId:chainId' format.");
+                throw new FormatException($"ChainId {chainId} should be a string and conform to CAIP-2.");
             }
 
             var chains = GetNamespacesChains(namespaces);