Implement custom auth provider feature in plugin system

src/Zirconium/Core/AuthManager.cs

@@ -1,8 +1,10 @@
+using System.Collections.Generic;
 using System;
 using JWT.Algorithms;
 using JWT.Builder;
 using Newtonsoft.Json;
 using Zirconium.Utils;
+using Zirconium.Core.Plugins.Interfaces;
 
 namespace Zirconium.Core
 {
@@ -11,10 +13,14 @@ namespace Zirconium.Core
         private App _app;
         private string _secretString;
         private const long DEFAULT_TOKEN_EXPIRATION_TIME_HOURS = 24 * 3600000;
+        private IList<IAuthProvider> _authProviders;
+        private IAuthProvider _defaultAuthProvider;
 
         public AuthManager(App app)
         {
             _app = app;
+            _authProviders = new List<IAuthProvider>();
+            _defaultAuthProvider = null;
             _secretString = Guid.NewGuid().ToString();
         }
 
@@ -42,7 +48,18 @@ namespace Zirconium.Core
                 .WithSecret(_secretString)
                 .MustVerifySignature()
                 .Decode(token);
-            return JsonConvert.DeserializeObject<JWTPayload>(jsonPayload);
+            var payload = JsonConvert.DeserializeObject<JWTPayload>(jsonPayload);
+            if (_defaultAuthProvider == null) {
+                throw new Exception("Default auth provider isn't specified");
+            }
+            var validToken = _defaultAuthProvider.TestToken(token, payload);
+            if (!validToken)
+                return null;
+            return payload;
+        }
+
+        public void AddAuthProvider(IAuthProvider provider) {
+            _authProviders.Add(provider);
         }
     }
 }

src/Zirconium/Core/Config.cs

@@ -21,6 +21,8 @@ namespace Zirconium.Core
 
         // Configurations of plugins
         public Dictionary<string, dynamic> Plugins { get; set; }
+        
+        public string AuthenticationProvider { get; set; }
     }
 
     public class Websocket

src/Zirconium/Core/Plugins/Interfaces/IAuthProvider.cs

@@ -0,0 +1,8 @@
+namespace Zirconium.Core.Plugins.Interfaces
+{
+    public interface IAuthProvider
+    {
+        bool TestToken(string token, JWTPayload payload);
+        string GetAuthProviderName();
+    }
+}

src/Zirconium/Core/Plugins/Interfaces/IPluginHostAPI.cs

@@ -15,5 +15,6 @@ namespace Zirconium.Core.Plugins.Interfaces
         void SendMessage(ConnectionInfo connInfo, BaseMessage message);
         dynamic GetSettings(IPluginAPI plugin);
         dynamic GetSettings(string pluginName);
+        void ProvideAuth(IAuthProvider provider);
     }
 }

src/Zirconium/Core/Plugins/PluginHostAPI.cs

@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System;
 using Newtonsoft.Json;
 using Zirconium.Core.Models;
 using Zirconium.Core.Plugins.Interfaces;
@@ -17,6 +16,10 @@ namespace Zirconium.Core.Plugins
             _app = app;
         }
 
+        public void ProvideAuth(IAuthProvider provider) {
+            _app.AuthManager.AddAuthProvider(provider);
+        }
+
         public void FireEvent(CoreEvent coreEvent)
         {
             _router.RouteCoreEvent(coreEvent);

src/Zirconium/Core/Plugins/PluginManager.cs

@@ -65,6 +65,7 @@ namespace Zirconium.Core.Plugins
                                             typeof(IPluginAPI),
                                             typeof(IPluginHostAPI),
                                             typeof(IPluginManager),
+                                            typeof(IAuthProvider),
                                             typeof(IC2SMessageHandler),
                                             typeof(ICoreEventHandler),
                                             typeof(BaseMessage),