public void RecordFailure(HttpContext httpContext)
{
string requesterIdentifier = GetUniqueRequesterIdentifier(httpContext) !;
LogMessages.OnFailure(this._logger, requesterIdentifier, null !);
Fail2BanRecord newRecord = this._recordStore.AddOrUpdate(
requesterIdentifier,
_ => Fail2BanRecord.Create(),
(_, record) => record.Record()
);
if (CheckApplyRateLimiting(newRecord) == true)
{
LogMessages.OnRateLimitingApplied(this._logger, requesterIdentifier, null !);
}
}
private bool?CheckApplyRateLimiting(Fail2BanRecord record)
{
TimeSpan timeDiff = record.MostRecentFailure - record.FirstFailure;
// If this record is stale, kick it out
if (timeDiff > this._options.DebounceTime)
{
return(false);
}
// If we haven't reached the count yet, hold on to the record
if (record.FailureCount <= this._options.MaximumAttempts)
{
return(null);
}
return(true);
}
private Fail2BanRecord(Fail2BanRecord copy)
{
this.FirstFailure = copy.FirstFailure;
this.FailureCount = copy.FailureCount + 1;
}