Add HubCallerContext to Hub

- Flow the connection id and user of the caller to the Hub

samples/SocketsSample/EndPoints/HubEndpoint.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Channels;
+using Microsoft.AspNetCore.Sockets;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using SocketsSample.Hubs;
@@ -28,12 +29,13 @@ namespace SocketsSample
             return new SingleClientProxy(this, connectionId);
         }
 
-        protected override void Initialize(object endpoint)
+        protected override void Initialize(Connection connection, object endpoint)
         {
             var hub = (Hub)endpoint;
             hub.Clients = this;
+            hub.Context = new HubCallerContext(connection.ConnectionId, connection.User);
 
-            base.Initialize(endpoint);
+            base.Initialize(connection, endpoint);
         }
 
         protected override void DiscoverEndpoints()

samples/SocketsSample/EndPoints/RpcEndpoint.cs

@@ -16,8 +16,8 @@ namespace SocketsSample
 {
     public class RpcEndpoint : EndPoint
     {
-        private readonly Dictionary<string, Func<InvocationDescriptor, InvocationResultDescriptor>> _callbacks
-            = new Dictionary<string, Func<InvocationDescriptor, InvocationResultDescriptor>>(StringComparer.OrdinalIgnoreCase);
+        private readonly Dictionary<string, Func<Connection, InvocationDescriptor, InvocationResultDescriptor>> _callbacks
+            = new Dictionary<string, Func<Connection, InvocationDescriptor, InvocationResultDescriptor>>(StringComparer.OrdinalIgnoreCase);
         private readonly Dictionary<string, Type[]> _paramTypes = new Dictionary<string, Type[]>();
 
         private readonly ILogger<RpcEndpoint> _logger;
@@ -71,10 +71,10 @@ namespace SocketsSample
                 }
 
                 InvocationResultDescriptor result;
-                Func<InvocationDescriptor, InvocationResultDescriptor> callback;
+                Func<Connection, InvocationDescriptor, InvocationResultDescriptor> callback;
                 if (_callbacks.TryGetValue(invocationDescriptor.Method, out callback))
                 {
-                    result = callback(invocationDescriptor);
+                    result = callback(connection, invocationDescriptor);
                 }
                 else
                 {
@@ -90,7 +90,7 @@ namespace SocketsSample
             }
         }
 
-        protected virtual void Initialize(object endpoint)
+        protected virtual void Initialize(Connection connection, object endpoint)
         {
         }
 
@@ -113,7 +113,7 @@ namespace SocketsSample
                     _logger.LogDebug("RPC method '{methodName}' is bound", methodName);
                 }
 
-                _callbacks[methodName] = invocationDescriptor =>
+                _callbacks[methodName] = (connection, invocationDescriptor) =>
                 {
                     var invocationResult = new InvocationResultDescriptor();
                     invocationResult.Id = invocationDescriptor.Id;
@@ -125,7 +125,7 @@ namespace SocketsSample
                     {
                         object value = scope.ServiceProvider.GetService(type) ?? Activator.CreateInstance(type);
 
-                        Initialize(value);
+                        Initialize(connection, value);
 
                         try
                         {

samples/SocketsSample/Hubs/Hub.cs

@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
+using System.Security.Claims;
 using System.Threading.Tasks;
-
 namespace SocketsSample.Hubs
 {
     public class Hub
     {
         public IHubConnectionContext Clients { get; set; }
+
+        public HubCallerContext Context { get; set; }
     }
 
     public interface IHubConnectionContext
@@ -26,4 +28,17 @@ namespace SocketsSample.Hubs
         /// <returns>A task that represents when the data has been sent to the client.</returns>
         Task Invoke(string method, params object[] args);
     }
+
+    public class HubCallerContext
+    {
+        public HubCallerContext(string connectionId, ClaimsPrincipal user)
+        {
+            ConnectionId = connectionId;
+            User = user;
+        }
+
+        public ClaimsPrincipal User { get; }
+
+        public string ConnectionId { get; }
+    }
 }