Add mqtt wildcard support for # and + symbols

Author: VVANDENBtnetcp

src/SlimMessageBus.Host.Mqtt/MqttMessageBus.cs

@@ -1,6 +1,7 @@
 namespace SlimMessageBus.Host.Mqtt;
 
 using System.Collections.Generic;
+using System.Text.RegularExpressions;
 using System.Threading;
 
 using Microsoft.Extensions.DependencyInjection;
@@ -107,9 +108,16 @@ protected override async Task DestroyConsumers()
         }
     }
 
+    private static bool CheckTopic(string allowedTopic, string topic)
+    {
+        var realTopicRegex = allowedTopic.Replace(@"/", @"\/").Replace("+", @"[a-zA-Z0-9 _.-]*").Replace("#", @"[a-zA-Z0-9 \/_#+.-]*");
+        var regex = new Regex(realTopicRegex);
+        return regex.IsMatch(topic);
+    }
+
     private Task OnMessageReceivedAsync(MqttApplicationMessageReceivedEventArgs arg)
     {
-        var consumer = Consumers.Cast<MqttTopicConsumer>().FirstOrDefault(x => x.Path == arg.ApplicationMessage.Topic);
+        var consumer = Consumers.Cast<MqttTopicConsumer>().FirstOrDefault(x => CheckTopic(x.Path, arg.ApplicationMessage.Topic));
         if (consumer != null)
         {
             var headers = new Dictionary<string, object>();

src/Tests/SlimMessageBus.Host.Mqtt.Test/MqttMessageBusIt.cs

@@ -55,6 +55,26 @@ public async Task BasicPubSubOnTopic(bool bulkProduce)
         await BasicPubSub(1, bulkProduce: bulkProduce);
     }
 
+    [Theory]
+    [InlineData("test-ping/+/first", "test-ping/test/first", 1)]
+    [InlineData("test-ping/+/first", "test-ping/test/first/first", 0)]
+    [InlineData("test-ping/+/first", "test-ping/first/test", 0)]
+    [InlineData("test-ping/#", "test-ping/test/first", 1)]
+    [InlineData("test-ping/#", "test-ping/test/first/first", 1)]
+    public async Task WildCardSubOnTopic(string wildCardTopic, string topic, int expected)
+    {
+        var concurrency = 2;
+
+        AddBusConfiguration(mbb =>
+        {
+            mbb
+                .Produce<PingMessage>(x => x.DefaultTopic(topic))
+                .Consume<PingMessage>(x => x.Topic(wildCardTopic).Instances(concurrency));
+        });
+
+        await BasicPubSub(expected, false);
+    }
+
     private async Task BasicPubSub(int expectedMessageCopies, bool bulkProduce)
     {
         // arrange