first commit

Kafka.Lib/Auth/UserChangeMessageType.cs

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+using System.Net.Http.Headers;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Confluent.Kafka;
+
+namespace Kafka.Lib.Auth;
+
+public class UserChangeMessageType : IMessageType
+{
+    private string? _userId;
+    private Dictionary<string, string> _changes = new Dictionary<string, string>();
+    private string? _id;
+    private readonly string _eventType = "NewUser";
+
+    public string? UserId
+    {
+        get => _userId;
+        set => _userId = value;
+    }
+
+    public Dictionary<string, string> Changes
+    {
+        get => _changes;
+        set => _changes = value;
+    }
+
+    public string? Id
+    {
+        get => _id;
+        set => _id = value;
+    }
+
+    public string EventType => _eventType;
+
+    [JsonIgnore]
+    public string Text
+    {
+        get => JsonSerializer.Serialize(this);
+        set
+        {
+            var val = JsonSerializer.Deserialize<UserChangeMessageType>(value);
+            if (val == null) throw new MessageNullException();
+
+            _changes = val.Changes;
+            _userId = val.UserId;
+            _id = val.Id;
+        }
+    }
+}