telegram-bot/modules/UrlLimitations/MessageHandler.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using BotFramework;
using BotFramework.Attributes;
using BotFramework.Setup;
using Kruzya.TelegramBot.Core.Cache;
using Kruzya.TelegramBot.Core.Data;
using Kruzya.TelegramBot.Core.Extensions;
using Microsoft.Extensions.Logging;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;

namespace Kruzya.TelegramBot.UrlLimitations
{
    public class MessageHandler : BotEventHandler
    {
        protected ILogger Logger;
        protected readonly CoreContext dbCtx;

        public MessageHandler(ILogger<MessageHandler> logger, CoreContext coreContext)
        {
            Logger = logger;
            dbCtx = coreContext;
        }

        [TextMessage(InChat.Public)]
        public async Task OnMessageReceived()
        {
            var option = await dbCtx.UserValues.FindOption(Chat.Id, From.Id, "urlLimitations.messagesAfterJoin");
            if (option == null)
            {
                return;
            }

            var messageCount = option.GetValue<UInt16>();
            if (messageCount > 10)
            {
                dbCtx.UserValues.Remove(option);
                return;
            }

            option.SetValue(messageCount + 1);
            var message = RawUpdate.Message;
            if (message.Entities.Count(e => e.Type == MessageEntityType.Url || e.Type == MessageEntityType.TextLink) >
                0 || await message.HasUnknownMention(Bot))
            {
                var targetChat = new ChatId(Chat.Id);
                Task.WaitAll(new Task[] {
                    Bot.KickChatMemberAsync(new ChatId(Chat.Id), From.Id, DateTime.Now.AddDays(1)),
                    Bot.DeleteMessageAsync(targetChat, message.MessageId),
                    Bot.SendTextMessageAsync(targetChat,
                    $"Member {From.ToHtml()} has been banned.\n<b>Reason</b>: <pre>Spam suspicion</pre>", ParseMode.Html)
                });
            }
        }
    }
}