telegram-bot/modules/DebugTools/Handler.cs

using BotFramework;
using BotFramework.Attributes;
using BotFramework.Enums;
using Kruzya.TelegramBot.Core.Service;
using Newtonsoft.Json;
using Telegram.Bot;
using Telegram.Bot.Types.Enums;

namespace West.TelegramBot.DebugTools;

public class Handler : BotEventHandler
{
    private readonly UserService _userService;

    public Handler(UserService userService)
    {
        _userService = userService;
    }

    [Command(InChat.All, "dump", CommandParseMode.Both)]
    public async Task HandleDump()
    {
        if (!_userService.IsUserSuper(From))
        {
            return;
        }

        var message = RawUpdate.Message!;
        await Bot.SendTextMessageAsync(Chat.Id, 
            $"<code>{JsonConvert.SerializeObject(message.ReplyToMessage, Formatting.Indented)}</code>",
            replyToMessageId: message.MessageId, parseMode: ParseMode.Html);
    }
}