fix: missing pairing topic in session struct

WalletConnectSharp.Core/Controllers/Store.cs

@@ -150,13 +150,9 @@ public Task Set(TKey key, TValue value)
         {
             IsInitialized();
 
-            if (map.ContainsKey(key))
-            {
-                return Update(key, value);
-            }
-
-            map.Add(key, value);
-            return Persist();
+            return !map.TryAdd(key, value)
+                ? Update(key, value)
+                : Persist();
         }
 
         /// <summary>

WalletConnectSharp.Core/Controllers/TopicMap.cs

@@ -1,6 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using WalletConnectSharp.Core.Interfaces;
 
 namespace WalletConnectSharp.Core.Controllers
@@ -66,23 +63,23 @@ public bool Exists(string topic, string id)
         /// <param name="id">The subscription id to remove, if set to null then all ids are removed from the topic</param>
         public void Delete(string topic, string id = null)
         {
-            if (!topicMap.ContainsKey(topic))
+            if (!topicMap.TryGetValue(topic, out var ids))
+            {
                 return;
+            }
 
             if (id == null)
             {
                 topicMap.Remove(topic);
-                return;
             }
-
-            if (!Exists(topic, id))
-                return;
-
-            var ids = topicMap[topic];
-            ids.Remove(id);
-
-            if (ids.Count == 0)
-                topicMap.Remove(topic);
+            else
+            {
+                ids.Remove(id);
+                if (ids.Count == 0)
+                {
+                    topicMap.Remove(topic);
+                }
+            }
         }
 
         /// <summary>

WalletConnectSharp.Sign/Engine.cs

@@ -464,6 +464,7 @@ public async Task<ConnectedData> Connect(ConnectOptions options)
                 Expiry = expiry,
                 Id = id,
                 Proposer = proposal.Proposer,
+                PairingTopic = topic,
                 Relays = proposal.Relays,
                 RequiredNamespaces = proposal.RequiredNamespaces,
                 OptionalNamespaces = proposal.OptionalNamespaces,
@@ -587,7 +588,6 @@ public async Task<IApprovedData> Approve(ApproveParams @params)
                 Namespaces = namespaces,
                 Controller = new Participant() { PublicKey = selfPublicKey, Metadata = this.Client.Metadata },
                 Expiry = Clock.CalculateExpiry(SessionExpiry),
-                PairingTopic = pairingTopic
             };
 
             await this.Client.Core.Relayer.Subscribe(sessionTopic);

WalletConnectSharp.Sign/Internals/EngineHandler.cs

@@ -88,13 +88,11 @@ async Task IEnginePrivate.OnSessionProposeResponse(string topic, JsonRpcResponse
             logger.Log($"Got session propose response with id {id}");
             if (payload.IsError)
             {
-                logger.LogError("response was error");
                 await this.Client.Proposal.Delete(id, Error.FromErrorType(ErrorType.USER_DISCONNECTED));
                 this.SessionConnectionErrored?.Invoke(this, payload.Error.ToException());
             }
             else
             {
-                logger.Log("response was success");
                 var result = payload.Result;
                 var proposal = this.Client.Proposal.Get(id);
                 var selfPublicKey = proposal.Proposer.PublicKey;
@@ -104,10 +102,12 @@ async Task IEnginePrivate.OnSessionProposeResponse(string topic, JsonRpcResponse
                     selfPublicKey,
                     peerPublicKey
                 );
+
+                proposal.SessionTopic = sessionTopic;
+                await Client.Proposal.Set(id, proposal);
                 await this.Client.Core.Pairing.Activate(topic);
-                logger.Log($"pairing activated for topic {topic}");
+                logger.Log($"Pairing activated for topic {topic}");
 
-                // try to do this a couple of times .. do it until it works?
                 int attempts = 5;
                 do
                 {
@@ -137,7 +137,10 @@ async Task IEnginePrivate.OnSessionSettleRequest(string topic, JsonRpcRequest<Se
             try
             {
                 await PrivateThis.IsValidSessionSettleRequest(@params);
-                var pairingTopic = @params.PairingTopic;
+
+                var proposal = Array.Find(Client.Proposal.Values, p => p.SessionTopic == topic);
+
+                var pairingTopic = proposal.PairingTopic;
                 var relay = @params.Relay;
                 var controller = @params.Controller;
                 var expiry = @params.Expiry;
@@ -163,7 +166,7 @@ async Task IEnginePrivate.OnSessionSettleRequest(string topic, JsonRpcRequest<Se
                         Metadata = controller.Metadata
                     },
 #pragma warning disable S6602
-                    RequiredNamespaces = Client.Proposal.Values.FirstOrDefault(p => p.PairingTopic == pairingTopic).RequiredNamespaces
+                    RequiredNamespaces = proposal.RequiredNamespaces
 #pragma warning restore S6602
                 };
                 await MessageHandler.SendResult<SessionSettle, bool>(payload.Id, topic, true);

WalletConnectSharp.Sign/Models/Engine/Methods/SessionSettle.cs

@@ -18,6 +18,7 @@ public class SessionSettle : IWcMethod
         /// Pairing topic for this session
         /// </summary>
         [JsonProperty("pairingTopic")]
+        [Obsolete("This isn't a standard property of the Sign API. Other Sign implementations may not support this property whcih could lead to unexpected behavior.")]
         public string PairingTopic;
 
         /// <summary>

WalletConnectSharp.Sign/Models/ProposalStruct.cs

@@ -79,6 +79,12 @@ public long Key
         [JsonProperty("pairingTopic")]
         public string PairingTopic;
 
+        /// <summary>
+        /// The topic of the session. Set after the proposal is approved.
+        /// </summary>
+        [JsonProperty("sessionTopic")]
+        public string SessionTopic;
+
         /// <summary>
         /// Approve this proposal with a single address and (optional) protocol options. The
         /// protocolOption given must exist in this proposal