public override int Execute(IDataContext context)
{
var result = 0;
ContextQuery = ctx =>
{
var user = ctx.AsQueryable <User>().SingleOrDefault(t => t.Id == UserId);
if (user == null)
{
throw new DomainException($"User with Id {UserId} could not be found");
}
var entry = CaptchaEntry.Create(user);
ctx.Add(entry);
ctx.Commit();
result = entry.Id;
};
ExecuteInternal(context);
return(result);
}
public void POST(string key, RequestInfo info)
{
if (string.IsNullOrWhiteSpace(key))
{
var target = info.Request.Param["target"].Value;
if (string.IsNullOrWhiteSpace(target))
{
info.ReportClientError("Missing target parameter");
return;
}
var answer = CaptchaUtil.CreateRandomAnswer(minlength: 6, maxlength: 6);
var nonce = Guid.NewGuid().ToString();
string token;
using (var ms = new System.IO.MemoryStream())
{
var bytes = System.Text.Encoding.UTF8.GetBytes(answer + nonce);
ms.Write(bytes, 0, bytes.Length);
ms.Position = 0;
token = Library.Utility.Utility.Base64PlainToBase64Url(Library.Utility.Utility.CalculateHash(ms));
}
lock (m_lock)
{
var expired = m_captchas.Where(x => x.Value.Expires < DateTime.Now).Select(x => x.Key).ToArray();
foreach (var x in expired)
{
m_captchas.Remove(x);
}
if (m_captchas.Count > 3)
{
info.ReportClientError("Too many captchas, wait 2 minutes and try again", System.Net.HttpStatusCode.ServiceUnavailable);
return;
}
m_captchas[token] = new CaptchaEntry(answer, target);
}
info.OutputOK(new
{
token = token
});
}
else
{
var answer = info.Request.Param["answer"].Value;
var target = info.Request.Param["target"].Value;
if (string.IsNullOrWhiteSpace(answer))
{
info.ReportClientError("Missing answer parameter");
return;
}
if (string.IsNullOrWhiteSpace(target))
{
info.ReportClientError("Missing target parameter");
return;
}
if (SolvedCaptcha(key, target, answer))
{
info.OutputOK();
}
else
{
info.ReportClientError("Incorrect");
}
}
}
