Checking leika key with regex

FitConnect/FluentSender.cs

@@ -212,6 +212,9 @@ public class FluentSender : Sender, IFluentSender, IFluentSenderWithDestination,
     }
 
     public IFluentSenderWithService WithServiceType(string serviceName, string leikaKey) {
+        if (!Regex.IsMatch(leikaKey, "^urn:[a-z0-9][a-z0-9-]{0,31}:[a-z0-9()+,.:=@;$_!*'%/?#-]+$"))
+            throw new ArgumentException("Invalid leika key");
+
         Submission.ServiceType = new ServiceType() {
             Name = serviceName,
             Identifier = leikaKey

FluentApiTest/FluentSenderTests.cs

@@ -2,6 +2,7 @@ using System;
 using Autofac;
 using FitConnect;
 using FitConnect.Models;
+using FluentAssertions;
 using Microsoft.Extensions.Logging;
 using MockContainer;
 using NUnit.Framework;
@@ -30,11 +31,23 @@ public class FluentSenderTests {
             logger: logger);
     }
 
+    [Test]
+    public void FluentSender_ShouldNotThrowAnError_ArgumentExceptionLeikaKeyInvalid() {
+        Assert.Throws<ArgumentException>(() => {
+            _client.GetSender()
+                .WithDestination("destinationId")
+                .WithServiceType("", "")
+                .WithAttachments(Array.Empty<Attachment>())
+                .WithData("")
+                .Submit();
+        })!.Message.Should().Be("Invalid leika key");
+    }
+
     [Test]
     public void FluentSender_ShouldNotThrowAnError_MockingServicesWithData() {
         _client.GetSender()
             .WithDestination("destinationId")
-            .WithServiceType("","")
+            .WithServiceType("", "urn:de:fim:leika:leistung:99400048079000")
             .WithAttachments(Array.Empty<Attachment>())
             .WithData("")
             .Submit();
@@ -44,7 +57,7 @@ public class FluentSenderTests {
     public void FluentSender_ShouldNotThrowAnError_MockingServicesWithoutData() {
         _client.GetSender()
             .WithDestination("destinationId")
-            .WithServiceType("","")
+            .WithServiceType("", "urn:de:fim:leika:leistung:99400048079000")
             .WithAttachments(Array.Empty<Attachment>())
             .Submit();
     }