WIP: implemented registration and EULA accept, WIP on auth issue

JOBot.TClient/Services/UserService.cs

@@ -0,0 +1,41 @@
+using Grpc.Core;
+using JOBot.Proto;
+using JOBot.TClient.Infrastructure.Exceptions;
+using Telegram.Bot;
+using Telegram.Bot.Types;
+using User = JOBot.Proto.User;
+
+namespace JOBot.TClient.Services;
+
+public class UserService(ITelegramBotClient bot, User.UserClient userClient)
+{
+    /// <summary>
+    /// Get user
+    /// </summary>
+    /// <param name="update">Telegram Update object</param>
+    /// <param name="ct">Cancellation Token</param>
+    /// <returns>RPC User Response or null if user not exists</returns>
+    /// <exception cref="FallbackException">If something in server logic went wrong</exception>
+    /// <exception cref="ArgumentNullException">If update.Message is null</exception>
+    public async Task<GetUserResponse?> GetUser(Update update, CancellationToken ct = default)
+    {
+        ArgumentNullException.ThrowIfNull(update.Message?.From);
+
+        GetUserResponse? user;
+        try
+        {
+            user = await userClient.GetUserAsync(new GetUserRequest() //Получаем пользователя
+            {
+                UserId = update.Message.From.Id,
+            });
+        }
+        catch (RpcException e) //Пользователь не найден?
+        {
+            if (e.StatusCode != StatusCode.NotFound)
+                throw new FallbackException(TextResource.FallbackMessage, update.Message, bot);
+
+            return null;
+        }
+        return user;
+    }
+}