private bool IsCaptchaValidate(string captchaText, string captchaToken)
{
string token = captchaProtectionProvider.Decrypt(captchaToken);
int number;
if (!int.TryParse(captchaText, out number))
{
return(false);
}
string text = humanReadableIntegerProvider.NumberToText(number, DNTCaptcha.Core.Providers.Language.English);
return(text == token);
}
/// <summary>
/// Process the taghelper and generate the output.
/// </summary>
public void Process(TagHelperContext context, TagHelperOutput output)
{
context.CheckArgumentNull(nameof(context));
output.CheckArgumentNull(nameof(output));
setUrlHelper();
output.TagName = "div";
output.Attributes.Add("class", "dntCaptcha");
var captchaDivId = $"dntCaptcha{context.UniqueId}{_randomNumberProvider.Next(Min, Max)}";
output.Attributes.Add("id", captchaDivId);
output.TagMode = TagMode.StartTagAndEndTag;
var number = _randomNumberProvider.Next(Min, Max);
var randomText = _humanReadableIntegerProvider.NumberToText(number, Language);
var encryptedText = _captchaProtectionProvider.Encrypt(randomText);
var captchaImage = getCaptchaImageTagBuilder(encryptedText);
output.Content.AppendHtml(captchaImage);
var cookieToken = $".{captchaDivId}";
var refreshButton = getRefreshButtonTagBuilder(captchaDivId, cookieToken);
output.Content.AppendHtml(refreshButton);
var hiddenInput = getHiddenInputTagBuilder(encryptedText);
output.Content.AppendHtml(hiddenInput);
var textInput = getTextInputTagBuilder();
output.Content.AppendHtml($"{string.Format(TextBoxTemplate, textInput.GetString())}");
var validationMessage = getValidationMessageTagBuilder();
output.Content.AppendHtml(validationMessage);
var hiddenInputToken = getHiddenInputTokenTagBuilder(_captchaProtectionProvider.Encrypt(cookieToken));
output.Content.AppendHtml(hiddenInputToken);
var dataAjaxBeginScript = getOnRefreshButtonDataAjaxBegin();
output.Content.AppendHtml(dataAjaxBeginScript);
_captchaStorageProvider.Add(ViewContext.HttpContext, cookieToken, randomText);
}
public IActionResult CreateDNTCaptcha([FromBody] DNTCaptchaTagHelperHtmlAttributes captchaAttributes)
{
var number = _randomNumberProvider.Next(captchaAttributes.Min, captchaAttributes.Max);
var randomText = _humanReadableIntegerProvider.NumberToText(number, captchaAttributes.Language);
var encryptedText = _captchaProtectionProvider.Encrypt(randomText);
var captchaImageUrl = getCaptchaImageUrl(captchaAttributes, encryptedText);
var captchaDivId = $"dntCaptcha{Guid.NewGuid().ToString("N")}{_randomNumberProvider.Next(captchaAttributes.Min, captchaAttributes.Max)}";
var cookieToken = $".{captchaDivId}";
var hiddenInputToken = _captchaProtectionProvider.Encrypt(cookieToken);
_captchaStorageProvider.Add(HttpContext, cookieToken, randomText);
return(Json(new
{
dntCaptchaImgUrl = captchaImageUrl,
dntCaptchaId = captchaDivId,
dntCaptchaTextValue = encryptedText,
dntCaptchaTokenValue = hiddenInputToken
}));
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public DNTCaptchaValidatorResult Validate(
HttpContext httpContext,
string captchaText,
string inputText,
string cookieToken,
Language captchaGeneratorLanguage,
string errorMessage,
string isNumericErrorMessage)
{
if (!shouldValidate(httpContext))
{
_logger.LogInformation($"Ignoring ValidateDNTCaptcha during `{httpContext.Request.Method}`.");
return(new DNTCaptchaValidatorResult {
IsValid = true
});
}
if (string.IsNullOrEmpty(captchaText))
{
_logger.LogInformation("CaptchaHiddenInput is empty.");
return(new DNTCaptchaValidatorResult {
IsValid = false, ErrorMessage = errorMessage
});
}
if (string.IsNullOrEmpty(inputText))
{
_logger.LogInformation("CaptchaInput is empty.");
return(new DNTCaptchaValidatorResult {
IsValid = false, ErrorMessage = errorMessage
});
}
inputText = inputText.ToEnglishNumbers();
long inputNumber;
if (!long.TryParse(inputText, out inputNumber))
{
_logger.LogInformation("inputText is not a number.");
return(new DNTCaptchaValidatorResult {
IsValid = false, ErrorMessage = isNumericErrorMessage
});
}
var decryptedText = _captchaProtectionProvider.Decrypt(captchaText);
var numberToText = _humanReadableIntegerProvider.NumberToText(inputNumber, captchaGeneratorLanguage);
if (decryptedText == null || !decryptedText.Equals(numberToText))
{
_logger.LogInformation($"{decryptedText} != {numberToText}");
return(new DNTCaptchaValidatorResult {
IsValid = false, ErrorMessage = errorMessage
});
}
if (!isValidCookie(httpContext, decryptedText, cookieToken))
{
return(new DNTCaptchaValidatorResult {
IsValid = false, ErrorMessage = errorMessage
});
}
return(new DNTCaptchaValidatorResult {
IsValid = true
});
}
/// <summary>
/// Process the taghelper and generate the output.
/// </summary>
public void Process(TagHelperContext context, TagHelperOutput output)
{
context.CheckArgumentNull(nameof(context));
output.CheckArgumentNull(nameof(output));
output.TagName = "div";
output.Attributes.Add("class", "captcha");
var captchaDivId = $"captcha{context.UniqueId}{_randomNumberProvider.Next(Min, Max)}";
output.Attributes.Add("id", captchaDivId);
output.TagMode = TagMode.StartTagAndEndTag;
var number = _randomNumberProvider.Next(Min, Max);
var randomText = "";
randomText = OutputType == OutputType.InDigits ? DNTPersianUtils.Core.PersianNumbersUtils.ToPersianNumbers(number) : _humanReadableIntegerProvider.NumberToText(number, Language);
var encryptedText = _captchaProtectionProvider.Encrypt(randomText);
var captchaImage = GetCaptchaImageTagBuilder(encryptedText);
output.Content.AppendHtml(captchaImage);
var cookieToken = $".{captchaDivId}";
var refreshButton = GetRefreshButtonTagBuilder(captchaDivId, cookieToken);
output.Content.AppendHtml(refreshButton);
var hiddenInput = GetHiddenInputTagBuilder(encryptedText);
output.Content.AppendHtml(hiddenInput);
if (!ImageOnly)
{
var textInput = GetTextInputTagBuilder();
output.Content.AppendHtml($"{string.Format(TextBoxTemplate, textInput.GetString())}");
}
var validationMessage = GetValidationMessageTagBuilder();
output.Content.AppendHtml(validationMessage);
var hiddenInputToken = GetHiddenInputTokenTagBuilder(_captchaProtectionProvider.Encrypt(cookieToken));
output.Content.AppendHtml(hiddenInputToken);
_captchaStorageProvider.Add(ViewContext.HttpContext, cookieToken, randomText);
}
