Fix: SignalR Authorize & Firefox Compatibility

Changes in architecture to support authorization and temporary
workaround for NTLM in Firefox (to be removed in SignalR 2.x). Thanks to
@davidfowl

Disco.BI/BI/Interop/SignalRHandlers/LogNotifications.cs

@@ -0,0 +1,60 @@
+using Disco.Services.Logging;
+using Disco.Services.Logging.Models;
+using Microsoft.AspNet.SignalR;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Disco.BI.Interop.SignalRHandlers
+{
+    public class LogNotifications : AdminAuthorizedPersistentConnection
+    {
+        public static bool initialized = false;
+
+        public LogNotifications()
+        {
+            if (!initialized)
+            {
+                initialized = true;
+                Disco.Services.Logging.Targets.LogLiveContext.LogBroadcast += Broadcast;
+            }
+        }
+
+        protected override System.Threading.Tasks.Task OnReceived(IRequest request, string connectionId, string data)
+        {
+            // Add to Group
+            if (!string.IsNullOrWhiteSpace(data) && data.StartsWith("/addToGroups:") && data.Length > 13)
+            {
+                var groups = data.Substring(13).Split(',');
+                foreach (var g in groups)
+                {
+                    this.Groups.Add(connectionId, g);
+                }
+            }
+
+            return base.OnReceived(request, connectionId, data);
+        }
+
+        internal static void Broadcast(LogBase logModule, LogEventType eventType, DateTime Timestamp, params object[] Arguments)
+        {
+            var message = LogLiveEvent.Create(logModule, eventType, Timestamp, Arguments);
+
+            var connectionManager = GlobalHost.ConnectionManager;
+            var connectionContext = connectionManager.GetConnectionContext<LogNotifications>();
+            connectionContext.Groups.Send(_GroupNameAll, message);
+            connectionContext.Groups.Send(logModule.ModuleName, message);
+        }
+
+        private const string _GroupNameAll = "__All";
+
+        public static string AllNotifications
+        {
+            get
+            {
+                return _GroupNameAll;
+            }
+        }
+    }
+}