async public Task <string> AddSuspicousUserAndGenerateCaptchaCodeAsync(string username)
{
var suspiciousUser = SuspiciousUser.FromStringOrDefault(await _cache.GetStringAsync(username), username);
suspiciousUser.CountFailes++;
Random rand = new Random();
int maxRand = _options.CaptchaCodeLetters.Length - 1;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < _options.CaptchaCodeLength; i++)
{
int index = rand.Next(maxRand);
sb.Append(_options.CaptchaCodeLetters[index]);
}
string code = sb.ToString();
suspiciousUser.CaptchaCode = code;
suspiciousUser.TimeStamp = DateTime.Now;
await _cache.SetStringAsync(username, suspiciousUser.ToString());
return(code);
}
async public Task AddSuspiciousUserAsync(string username)
{
var suspiciousUser = SuspiciousUser.FromStringOrDefault(await _cache.GetStringAsync(username), username);
suspiciousUser.TimeStamp = DateTime.Now;
suspiciousUser.CountFailes++;
await _cache.SetStringAsync(username, suspiciousUser.ToString());
}
async public Task RemoveSuspiciousUserAsync(string username)
{
var suspiciousUser = SuspiciousUser.FromString(await _cache.GetStringAsync(username));
if (suspiciousUser != null)
{
await _cache.RemoveAsync(username);
}
}
async public Task <bool> IsSuspiciousUserAsync(string username)
{
if (String.IsNullOrWhiteSpace(username))
{
throw new ArgumentException("Username required");
}
var suspiciousUser = SuspiciousUser.FromString(await _cache.GetStringAsync(username));
if (suspiciousUser != null)
{
var lastSet = suspiciousUser.TimeStamp.ToUniversalTime();
if ((DateTime.UtcNow - lastSet).TotalMinutes >= _options.RembemberSuspiciousUserTotalMinutes)
{
await RemoveSuspiciousUserAsync(username);
return(false);
}
return(suspiciousUser.CountFailes >= _options.MaxFailCount);
}
return(false);
}
async public Task <bool> VerifyCaptchaCodeAsync(string username, string code)
{
var suspiciousUser = SuspiciousUser.FromStringOrDefault(await _cache.GetStringAsync(username), username);
return(code != null && code.Equals(suspiciousUser.CaptchaCode, StringComparison.InvariantCultureIgnoreCase));
}