telegram-bot/modules/UrlLimitations/UserJoinHandler.cs

using System;
using System.Threading.Tasks;
using BotFramework;
using BotFramework.Attributes;
using BotFramework.Enums;
using Kruzya.TelegramBot.Core.Data;
using Kruzya.TelegramBot.Core.Extensions;

namespace Kruzya.TelegramBot.UrlLimitations;

public class UserJoinHandler : BotEventHandler
{
    protected readonly CoreContext dbCtx;
        
    public UserJoinHandler(CoreContext coreContext)
    {
        dbCtx = coreContext;
    }

    [InChat(InChat.Public)]
    [Message(MessageFlag.HasNewChatMembers)]
    public async Task OnChatMembersAdded()
    {
        foreach (var member in RawUpdate.Message.NewChatMembers)
            await dbCtx.UserValues.SetOptionValue<UInt16>(Chat.Id, member.Id, "urlLimitations.messagesAfterJoin",
                0);
    }
}