Added auth

WebApi/Authentication/JwtBearerEventsHandler.cs

@@ -0,0 +1,25 @@
+using Mediator;
+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Musify.Application.Users.Commands;
+using System.Security.Claims;
+
+namespace WebApi.Authentication;
+
+public sealed class JwtBearerEventsHandler(IMediator mediator) : JwtBearerEvents
+{
+    public override async Task TokenValidated(TokenValidatedContext tokenValidatedContext)
+    {
+        var principal = tokenValidatedContext.Principal!;
+
+        var id = principal.FindFirstValue(ClaimTypes.NameIdentifier)!;
+        var guidId = Guid.Parse(id);
+
+        var username = principal.FindFirstValue(ClaimTypes.Name)!;
+        var firstName = principal.FindFirstValue(ClaimTypes.GivenName);
+        var lastName = principal.FindFirstValue(ClaimTypes.Surname);
+
+        await mediator.Send(
+            new CreateUserCommand(guidId, username, firstName, lastName),
+            tokenValidatedContext.HttpContext.RequestAborted);
+    }
+}