public FloodCheckResult IsFlood(
long chatId,
long userId
)
{
const float floodOffset = 3;
var lastActivities = GetLastActivity(chatId, userId);
var itemCount = lastActivities.Count();
var floodRate = itemCount / floodOffset;
var isFlood = floodRate > 1;
_logger.LogDebug(
"UserId {UserId} is Flood at ChatId {ChatId}? {IsFlood}. Rate: {Rate}. Item: {Item}",
userId,
chatId,
isFlood,
floodRate,
itemCount
);
var floodResult = new FloodCheckResult()
{
IsFlood = isFlood,
FloodRate = floodRate,
LastActivitiesCount = itemCount
};
return(floodResult);
}
public static async Task <FloodCheckResult> FloodCheckAsync(this TelegramService telegramService)
{
var channelOrEditedPost = telegramService.ChannelOrEditedPost;
var from = telegramService.From;
var chat = telegramService.Chat;
var update = telegramService.Update;
var messageDate = telegramService.MessageDate;
var defaultFloodCheck = new FloodCheckResult();
if (channelOrEditedPost != null ||
telegramService.InlineQuery != null ||
telegramService.ChosenInlineResult != null ||
chat == null)
{
return(defaultFloodCheck);
}
var chatSettings = await telegramService.GetChatSetting();
if (!chatSettings.EnableFloodCheck)
{
Log.Debug("Flood check disabled for ChatId {ChatId}", chat.Id);
return(defaultFloodCheck);
}
var floodCheckResult = telegramService.FloodCheckService.RunFloodCheck
(
new HitActivity()
{
Guid = Guid.NewGuid().ToString(),
MessageDate = messageDate,
UpdateType = update.Type,
ChatId = chat.Id,
ChatTitle = chat.Title,
ChatUsername = chat.Username,
ChatType = chat.Type,
FromId = from.Id,
FromUsername = from.Username,
FromLangCode = from.LanguageCode,
FromFirstName = from.FirstName,
FromLastName = from.LastName,
Timestamp = DateTime.Now
}
);
if (!floodCheckResult.IsFlood)
{
return(floodCheckResult);
}
if (!telegramService.IsGroupChat ||
telegramService.CheckSenderChannel() ||
await telegramService.CheckFromAdminOrAnonymous())
{
return(defaultFloodCheck);
}
var muteUntilDate = TimeSpan.FromMinutes(floodCheckResult.FloodRate * 5.33).ToDateTime();
var muteUntilStr = muteUntilDate.ToDetailDateTimeString();
await telegramService.RestrictMemberAsync(from.Id, until : muteUntilDate);
var nameLink = from.GetNameLink();
var text = $"Hai {nameLink}, sepertinya Anda melakukan Flooding!" +
$"\nAnda di mute hingga {muteUntilStr} di Obrolan ini";
await telegramService.SendTextMessageAsync(
text,
replyToMsgId : 0,
scheduleDeleteAt : muteUntilDate.ToUniversalTime(),
messageFlag : MessageFlag.FloodWarn
);
telegramService.ChatService
.DeleteMessageHistory(
history =>
history.MessageFlag == MessageFlag.FloodWarn &&
history.ChatId == chat.Id
)
.InBackground();
return(floodCheckResult);
}
