public async Task <bool> CheckCaptchaAsync(CaptchaParameters captchaParameters)
{
bool result = false;
if (!_captchaOptions.IsCaptchaEnabled)
{
return(result);
}
foreach (var captchaField in captchaParameters.Fields)
{
if (captchaField.IsEnabledThreshold)
{
string thresholdKeyName =
$"{captchaParameters.ControllerName}_{captchaParameters.ActionName}_{captchaField.FieldType.ToString()}_Threshold";
if (captchaField.Threshold == -1)
{
captchaField.Threshold = _captchaOptions.Threshold;
}
}
if (captchaField.IsEnabledDuration)
{
string durationKeyName = $"{captchaParameters.ControllerName}_{captchaParameters.ActionName}_{captchaField.FieldType.ToString()}_Duration";
if (captchaField.Threshold == -1)
{
captchaField.Duration = _captchaOptions.Duration;
}
}
string cacheKeyPattern = captchaField.GetCacheKey(_captchaOptions.DomainName,
captchaParameters.ControllerName, captchaParameters.ActionName, captchaParameters.GlobalCacheName,
captchaParameters.IpAddress);
int cacheVisitCount = _distributedCache.Get <int>(cacheKeyPattern);
if (cacheVisitCount >= captchaField.Threshold)
{
if (!string.IsNullOrEmpty(captchaParameters.CaptchaToken))
{
result = await CheckCaptchaTokenAsync(cacheKeyPattern, cacheVisitCount, captchaField.Duration,
captchaParameters.CaptchaToken);
}
else
{
AddToCache(cacheKeyPattern, cacheVisitCount, captchaField.Duration);
}
}
else
{
AddToCache(cacheKeyPattern, cacheVisitCount, captchaField.Duration);
}
}
return(result);
}
public virtual async Task <IActionResult> ValidateCaptcha(Guid id, string solution)
{
try
{
var parameters = new CaptchaParameters
{
CaptchaId = id,
ControllerName = nameof(CaptchaController),
ActionName = nameof(ValidateCaptcha),
IpAddress = Request.HttpContext.Connection?.RemoteIpAddress?.ToString()
};
await _validation.ValidateAsync(parameters, solution);
}
catch
{
return(BadRequest());
}
return(Ok());
}
public Task ValidateAsync(CaptchaParameters parameters, string solution)
{
Captcha captcha = _storage.GetCaptcha(parameters.CaptchaId);
if (string.IsNullOrWhiteSpace(solution))
{
throw new CaptchaValidationException("Empty solution.");
}
TimeSpan diff = DateTime.Now - captcha.Created;
if (diff > _captchaOptions.Timeout)
{
throw new CaptchaTimeoutException();
}
if (captcha.Solution != solution)
{
throw new CaptchaValidationException("Invalid solution.");
}
return(Task.CompletedTask);
}