/// <inheritdoc cref="ICaptcha.Create" />
public void Create(HttpContext context)
{
var feature = GetCaptchaFeature(context);
if (feature.HasCaptchaToken)
{
store.InvalidateCaptcha(context, feature.CaptchaToken);
}
var text = textGenerator.Generate();
var blob = new BinaryBlob(256);
var token = new CaptchaToken(blob);
var cookie = options.Cookie.Build(context);
var captcha = new GeneratedCaptcha(token, text, DateTime.UtcNow);
store.SetCaptcha(context, captcha);
context.Response.Cookies.Append(
options.Cookie.Name,
WebEncoders.Base64UrlEncode(token.Value.GetData()),
cookie
);
logger.LogDebug($"New CAPTCHA was generated: {options.Cookie.Name}={blob.DebugString}");
}
public void InvalidateCaptcha(HttpContext context, CaptchaToken token)
{
if (null == context)
{
throw new ArgumentNullException(nameof(context));
}
if (null == token)
{
throw new ArgumentNullException(nameof(token));
}
cache.Remove(token.Value);
}
public GeneratedCaptcha GetCaptcha(HttpContext context, CaptchaToken token)
{
if (null == context)
{
throw new ArgumentNullException(nameof(context));
}
if (null == token)
{
throw new ArgumentNullException(nameof(token));
}
if (cache.TryGetValue(token.Value, out var captcha))
{
return(captcha);
}
return(null);
}
public GeneratedCaptcha(CaptchaToken token, char[] captcha, DateTime createdAt)
{
Token = token;
Captcha = captcha;
CreatedAt = createdAt;
}