/// <summary>
/// Creates DNTCaptcha
/// </summary>
/// <param name="captchaAttributes">captcha attributes</param>
public DNTCaptchaApiResponse CreateDNTCaptcha(DNTCaptchaTagHelperHtmlAttributes captchaAttributes)
{
if (captchaAttributes == null)
{
throw new ArgumentNullException(nameof(captchaAttributes));
}
if (_httpContextAccessor.HttpContext == null)
{
throw new InvalidOperationException("`_httpContextAccessor.HttpContext` is null.");
}
var number = _randomNumberProvider.NextNumber(captchaAttributes.Min, captchaAttributes.Max);
var randomText = _captchaTextProvider(captchaAttributes.DisplayMode).GetText(number, captchaAttributes.Language);
var encryptedText = _captchaProtectionProvider.Encrypt(randomText);
var captchaImageUrl = getCaptchaImageUrl(captchaAttributes, encryptedText);
var captchaDivId = Invariant($"{_captchaOptions.CaptchaClass}{Guid.NewGuid():N}{_randomNumberProvider.NextNumber(captchaAttributes.Min, captchaAttributes.Max)}");
var cookieToken = $".{captchaDivId}";
var hiddenInputToken = _captchaProtectionProvider.Encrypt(cookieToken);
_captchaStorageProvider.Add(_httpContextAccessor.HttpContext, cookieToken, randomText);
return(new DNTCaptchaApiResponse
{
DntCaptchaImgUrl = captchaImageUrl,
DntCaptchaId = captchaDivId,
DntCaptchaTextValue = encryptedText,
DntCaptchaTokenValue = hiddenInputToken
});
}
/// <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 = _captchaTextProvider(DisplayMode).GetText(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);
}
/// <summary>
/// Adds the specified token and its value to the storage.
/// </summary>
public void Add(HttpContext context, string token, string value)
{
value = _captchaProtectionProvider.Encrypt($"{value}{context.GetSalt(_captchaProtectionProvider)}");
_distributedCache.Set(token, Encoding.UTF8.GetBytes(value), new DistributedCacheEntryOptions
{
AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(_options.AbsoluteExpirationMinutes)
});
}
/// <summary>
/// Adds the specified token and its value to the storage.
/// </summary>
public void Add(HttpContext context, string token, string value)
{
value = _captchaProtectionProvider.Encrypt($"{value}{context.GetSalt(_captchaProtectionProvider)}");
_memoryCache.Set(token, value, new MemoryCacheEntryOptions
{
AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(_options.AbsoluteExpirationMinutes),
Size = 1 // the size limit is the count of entries
});
}
/// <summary>
/// Creates DNTCaptcha
/// </summary>
/// <param name="captchaAttributes">captcha attributes</param>
public DNTCaptchaApiResponse CreateDNTCaptcha(DNTCaptchaTagHelperHtmlAttributes captchaAttributes)
{
var number = _randomNumberProvider.Next(captchaAttributes.Min, captchaAttributes.Max);
var randomText = _captchaTextProvider(captchaAttributes.DisplayMode).GetText(number, captchaAttributes.Language);
var encryptedText = _captchaProtectionProvider.Encrypt(randomText);
var captchaImageUrl = getCaptchaImageUrl(captchaAttributes, encryptedText);
var captchaDivId = $"dntCaptcha{Guid.NewGuid():N}{_randomNumberProvider.Next(captchaAttributes.Min, captchaAttributes.Max)}";
var cookieToken = $".{captchaDivId}";
var hiddenInputToken = _captchaProtectionProvider.Encrypt(cookieToken);
_captchaStorageProvider.Add(_httpContextAccessor.HttpContext, cookieToken, randomText);
return(new DNTCaptchaApiResponse
{
DntCaptchaImgUrl = captchaImageUrl,
DntCaptchaId = captchaDivId,
DntCaptchaTextValue = encryptedText,
DntCaptchaTokenValue = hiddenInputToken
});
}
/// <summary>
/// Adds the specified token and its value to the storage.
/// </summary>
public void Add(HttpContext context, string token, string value)
{
value = _captchaProtectionProvider.Encrypt($"{value}{context.GetSalt(_captchaProtectionProvider)}");
context.Response.Cookies.Append(token, value, getCookieOptions(context));
}
/// <summary>
/// Process the taghelper and generate the output.
/// </summary>
public void Process(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
if (ViewContext == null)
{
throw new InvalidOperationException("`ViewContext` is null.");
}
setUrlHelper(ViewContext);
output.TagName = "div";
output.Attributes.Add("class", _captchaOptions.CaptchaClass);
var captchaDivId = Invariant($"{_captchaOptions.CaptchaClass}{context.UniqueId}{_randomNumberProvider.NextNumber(Min, Max)}");
output.Attributes.Add("id", captchaDivId);
output.TagMode = TagMode.StartTagAndEndTag;
var number = _randomNumberProvider.NextNumber(Min, Max);
var randomText = _captchaTextProvider(DisplayMode).GetText(number, Language);
var encryptedText = _captchaProtectionProvider.Encrypt(randomText);
var captchaImage = getCaptchaImageTagBuilder(ViewContext, encryptedText);
output.Content.AppendHtml(captchaImage);
var cookieToken = $".{captchaDivId}";
var refreshButton = getRefreshButtonTagBuilder(ViewContext, captchaDivId, cookieToken);
output.Content.AppendHtml(refreshButton);
var hiddenInput = getHiddenInputTagBuilder(encryptedText);
output.Content.AppendHtml(hiddenInput);
var textInput = getTextInputTagBuilder();
output.Content.AppendHtml($"{string.Format(CultureInfo.InvariantCulture, TextBoxTemplate, textInput.GetString())}");
var validationMessage = getValidationMessageTagBuilder(ViewContext);
output.Content.AppendHtml(validationMessage);
var hiddenInputToken = getHiddenInputTokenTagBuilder(_captchaProtectionProvider.Encrypt(cookieToken));
output.Content.AppendHtml(hiddenInputToken);
var dataAjaxBeginScript = getOnRefreshButtonDataAjaxBegin(ViewContext);
output.Content.AppendHtml(dataAjaxBeginScript);
_captchaStorageProvider.Add(ViewContext.HttpContext, cookieToken, randomText);
}
/// <summary>
/// Adds the specified token and its value to the storage.
/// </summary>
public void Add(HttpContext context, string token, string value)
{
value = _captchaProtectionProvider.Encrypt($"{value}{context.GetSalt(_captchaProtectionProvider)}");
context.Session.SetString(token, value);
}
