Add interface for server options. Add context class for connection validator (hide internal packets).

Frameworks/MQTTnet.AspnetCore/MqttWebSocketServerAdapter.cs

@@ -12,7 +12,7 @@ namespace MQTTnet.AspNetCore
     {
         public event EventHandler<MqttServerAdapterClientAcceptedEventArgs> ClientAccepted;
 
-        public Task StartAsync(MqttServerOptions options)
+        public Task StartAsync(IMqttServerOptions options)
         {
             return Task.CompletedTask;
         }

Frameworks/MQTTnet.AspnetCore/ServiceCollectionExtensions.cs

@@ -9,7 +9,7 @@ namespace MQTTnet.AspNetCore
 {
     public static class ServiceCollectionExtensions
     {
-        public static IServiceCollection AddHostedMqttServer(this IServiceCollection services, MqttServerOptions options)
+        public static IServiceCollection AddHostedMqttServer(this IServiceCollection services, IMqttServerOptions options)
         {
             if (options == null) throw new ArgumentNullException(nameof(options));
 

Frameworks/MQTTnet.NetStandard/Adapter/IMqttServerAdapter.cs

@@ -8,7 +8,7 @@ namespace MQTTnet.Adapter
     {
         event EventHandler<MqttServerAdapterClientAcceptedEventArgs> ClientAccepted;
 
-        Task StartAsync(MqttServerOptions options);
+        Task StartAsync(IMqttServerOptions options);
         Task StopAsync();
     }
 }

Frameworks/MQTTnet.NetStandard/Implementations/MqttServerAdapter.Uwp.cs

@@ -21,7 +21,7 @@ namespace MQTTnet.Implementations
 
         public event EventHandler<MqttServerAdapterClientAcceptedEventArgs> ClientAccepted;
 
-        public async Task StartAsync(MqttServerOptions options)
+        public async Task StartAsync(IMqttServerOptions options)
         {
             if (options == null) throw new ArgumentNullException(nameof(options));
 

Frameworks/MQTTnet.NetStandard/Implementations/MqttServerAdapter.cs

@@ -30,7 +30,7 @@ namespace MQTTnet.Implementations
 
         public event EventHandler<MqttServerAdapterClientAcceptedEventArgs> ClientAccepted;
 
-        public Task StartAsync(MqttServerOptions options)
+        public Task StartAsync(IMqttServerOptions options)
         {
             if (_cancellationTokenSource != null) throw new InvalidOperationException("Server is already started.");
 

Frameworks/MQTTnet.NetStandard/Server/IMqttServer.cs

@@ -12,7 +12,7 @@ namespace MQTTnet.Server
 
         Task<IList<ConnectedMqttClient>> GetConnectedClientsAsync();
 
-        Task StartAsync(MqttServerOptions options);
+        Task StartAsync(IMqttServerOptions options);
         Task StopAsync();
     }
 }

Frameworks/MQTTnet.NetStandard/Server/IMqttServerOptions.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace MQTTnet.Server
+{
+    public interface IMqttServerOptions
+    {
+        Action<MqttApplicationMessageInterceptorContext> ApplicationMessageInterceptor { get; }
+        int ConnectionBacklog { get; }
+        Action<MqttConnectionValidatorContext> ConnectionValidator { get; }
+        TimeSpan DefaultCommunicationTimeout { get; }
+        MqttServerDefaultEndpointOptions DefaultEndpointOptions { get; }
+        IMqttServerStorage Storage { get; }
+        Action<MqttSubscriptionInterceptorContext> SubscriptionInterceptor { get; }
+        MqttServerTlsEndpointOptions TlsEndpointOptions { get; }
+    }
+}

Frameworks/MQTTnet.NetStandard/Server/MqttClientPendingMessagesQueue.cs

@@ -13,11 +13,11 @@ namespace MQTTnet.Server
     public sealed class MqttClientPendingMessagesQueue
     {
         private readonly BlockingCollection<MqttPublishPacket> _pendingPublishPackets = new BlockingCollection<MqttPublishPacket>();
-        private readonly MqttServerOptions _options;
+        private readonly IMqttServerOptions _options;
         private readonly MqttClientSession _session;
         private readonly IMqttNetLogger _logger;
 
-        public MqttClientPendingMessagesQueue(MqttServerOptions options, MqttClientSession session, IMqttNetLogger logger)
+        public MqttClientPendingMessagesQueue(IMqttServerOptions options, MqttClientSession session, IMqttNetLogger logger)
         {
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
             _session = session ?? throw new ArgumentNullException(nameof(session));

Frameworks/MQTTnet.NetStandard/Server/MqttClientSession.cs

@@ -19,7 +19,7 @@ namespace MQTTnet.Server
         private readonly MqttClientSubscriptionsManager _subscriptionsManager;
         private readonly MqttClientSessionsManager _sessionsManager;
         private readonly MqttClientPendingMessagesQueue _pendingMessagesQueue;
-        private readonly MqttServerOptions _options;
+        private readonly IMqttServerOptions _options;
         private readonly IMqttNetLogger _logger;
 
         private IMqttChannelAdapter _adapter;
@@ -28,7 +28,7 @@ namespace MQTTnet.Server
 
         public MqttClientSession(
             string clientId,
-            MqttServerOptions options,
+            IMqttServerOptions options,
             MqttClientSessionsManager sessionsManager,
             IMqttNetLogger logger)
         {

Frameworks/MQTTnet.NetStandard/Server/MqttClientSessionsManager.cs

@@ -18,11 +18,11 @@ namespace MQTTnet.Server
         private readonly Dictionary<string, MqttClientSession> _sessions = new Dictionary<string, MqttClientSession>();
         private readonly SemaphoreSlim _sessionsSemaphore = new SemaphoreSlim(1, 1);
 
-        private readonly MqttServerOptions _options;
+        private readonly IMqttServerOptions _options;
         private readonly MqttRetainedMessagesManager _retainedMessagesManager;
         private readonly IMqttNetLogger _logger;
 
-        public MqttClientSessionsManager(MqttServerOptions options, MqttRetainedMessagesManager retainedMessagesManager, IMqttNetLogger logger)
+        public MqttClientSessionsManager(IMqttServerOptions options, MqttRetainedMessagesManager retainedMessagesManager, IMqttNetLogger logger)
         {
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
             _options = options ?? throw new ArgumentNullException(nameof(options));
@@ -174,12 +174,19 @@ namespace MQTTnet.Server
 
         private MqttConnectReturnCode ValidateConnection(MqttConnectPacket connectPacket)
         {
-            if (_options.ConnectionValidator != null)
+            if (_options.ConnectionValidator == null)
             {
-                return _options.ConnectionValidator(connectPacket);
+                return MqttConnectReturnCode.ConnectionAccepted;
             }
+            
+            var context = new MqttConnectionValidatorContext(
+                connectPacket.ClientId,
+                connectPacket.Username,
+                connectPacket.Password,
+                connectPacket.WillMessage);
 
-            return MqttConnectReturnCode.ConnectionAccepted;
+            _options.ConnectionValidator(context);
+            return context.ReturnCode;
         }
 
         private async Task<GetOrCreateClientSessionResult> GetOrCreateClientSessionAsync(MqttConnectPacket connectPacket)

Frameworks/MQTTnet.NetStandard/Server/MqttClientSubscriptionsManager.cs

@@ -8,9 +8,9 @@ namespace MQTTnet.Server
     public sealed class MqttClientSubscriptionsManager
     {
         private readonly Dictionary<string, MqttQualityOfServiceLevel> _subscriptions = new Dictionary<string, MqttQualityOfServiceLevel>();
-        private readonly MqttServerOptions _options;
+        private readonly IMqttServerOptions _options;
 
-        public MqttClientSubscriptionsManager(MqttServerOptions options)
+        public MqttClientSubscriptionsManager(IMqttServerOptions options)
         {
             _options = options ?? throw new ArgumentNullException(nameof(options));
         }

Frameworks/MQTTnet.NetStandard/Server/MqttRetainedMessagesManager.cs

@@ -13,9 +13,9 @@ namespace MQTTnet.Server
         private readonly Dictionary<string, MqttApplicationMessage> _retainedMessages = new Dictionary<string, MqttApplicationMessage>();
         private readonly SemaphoreSlim _gate = new SemaphoreSlim(1, 1);
         private readonly IMqttNetLogger _logger;
-        private readonly MqttServerOptions _options;
+        private readonly IMqttServerOptions _options;
 
-        public MqttRetainedMessagesManager(MqttServerOptions options, IMqttNetLogger logger)
+        public MqttRetainedMessagesManager(IMqttServerOptions options, IMqttNetLogger logger)
         {
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
             _options = options ?? throw new ArgumentNullException(nameof(options));

Frameworks/MQTTnet.NetStandard/Server/MqttServer.cs

@@ -16,7 +16,7 @@ namespace MQTTnet.Server
         private MqttClientSessionsManager _clientSessionsManager;
         private MqttRetainedMessagesManager _retainedMessagesManager;
         private CancellationTokenSource _cancellationTokenSource;
-        private MqttServerOptions _options;
+        private IMqttServerOptions _options;
 
         public MqttServer(IEnumerable<IMqttServerAdapter> adapters, IMqttNetLogger logger)
         {
@@ -52,7 +52,7 @@ namespace MQTTnet.Server
             }
         }
 
-        public async Task StartAsync(MqttServerOptions options)
+        public async Task StartAsync(IMqttServerOptions options)
         {
             _options = options ?? throw new ArgumentNullException(nameof(options));
 

Frameworks/MQTTnet.NetStandard/Server/MqttServerOptions.cs

@@ -1,10 +1,8 @@
 using System;
-using MQTTnet.Packets;
-using MQTTnet.Protocol;
 
 namespace MQTTnet.Server
 {
-    public class MqttServerOptions
+    public class MqttServerOptions : IMqttServerOptions
     {
         public MqttServerDefaultEndpointOptions DefaultEndpointOptions { get; } = new MqttServerDefaultEndpointOptions();
 
@@ -14,7 +12,7 @@ namespace MQTTnet.Server
         
         public TimeSpan DefaultCommunicationTimeout { get; set; } = TimeSpan.FromSeconds(15);
 
-        public Func<MqttConnectPacket, MqttConnectReturnCode> ConnectionValidator { get; set; }
+        public Action<MqttConnectionValidatorContext> ConnectionValidator { get; set; }
 
         public Action<MqttApplicationMessageInterceptorContext> ApplicationMessageInterceptor { get; set; }
 

Frameworks/MQTTnet.NetStandard/Server/MqttServerOptionsBuilder.cs

@@ -1,6 +1,4 @@
 using System;
-using MQTTnet.Packets;
-using MQTTnet.Protocol;
 
 namespace MQTTnet.Server
 {
@@ -62,7 +60,7 @@ namespace MQTTnet.Server
             return this;
         }
 
-        public MqttServerOptionsBuilder WithConnectionValidator(Func<MqttConnectPacket, MqttConnectReturnCode> value)
+        public MqttServerOptionsBuilder WithConnectionValidator(Action<MqttConnectionValidatorContext> value)
         {
             _options.ConnectionValidator = value;
             return this;
@@ -80,7 +78,7 @@ namespace MQTTnet.Server
             return this;
         }
 
-        public MqttServerOptions Build()
+        public IMqttServerOptions Build()
         {
             return _options;
         }

Frameworks/MQTTnet.NetStandard/Server/MqttServerOptionsExtensions.cs

@@ -4,7 +4,7 @@ namespace MQTTnet.Server
 {
     public static class MqttServerOptionsExtensions
     {
-        public static int GetTlsEndpointPort(this MqttServerOptions options)
+        public static int GetTlsEndpointPort(this IMqttServerOptions options)
         {
             if (options == null) throw new ArgumentNullException(nameof(options));
 
@@ -16,7 +16,7 @@ namespace MQTTnet.Server
             return options.TlsEndpointOptions.Port.Value;
         }
 
-        public static int GetDefaultEndpointPort(this MqttServerOptions options)
+        public static int GetDefaultEndpointPort(this IMqttServerOptions options)
         {
             if (options == null) throw new ArgumentNullException(nameof(options));