private void DistortImage(int height, int width, Bitmap pic)
{
using (var copy = (Bitmap)pic.Clone())
{
double distort = _randomNumberProvider.Next(1, 6) * (_randomNumberProvider.Next(10) == 1 ? 1 : -1);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// Adds a simple wave
int newX = (int)(x + (distort * Math.Sin(Math.PI * y / 84.0)));
int newY = (int)(y + (distort * Math.Cos(Math.PI * x / 44.0)));
if (newX < 0 || newX >= width)
{
newX = 0;
}
if (newY < 0 || newY >= height)
{
newY = 0;
}
pic.SetPixel(x, y, copy.GetPixel(newX, newY));
}
}
}
}
/// <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);
}
/// <summary>
/// SumOfTwoNumbersToWords Provider
/// </summary>
public SumOfTwoNumbersToWordsProvider(
IRandomNumberProvider randomNumberProvider,
HumanReadableIntegerProvider humanReadableIntegerProvider)
{
_randomNumber = randomNumberProvider.Next(1, 7);
_humanReadableIntegerProvider = humanReadableIntegerProvider;
}
public async Task SendTemporaryCodeAsync(string subjectId)
{
var randomCode = _randomNumberProvider.Next();
await saveTwoFactorCodeClaimsAsync(subjectId, randomCode);
await sendCodeToUserAsync(subjectId, randomCode);
}
private int GenerateRandomNumber()
{
int min = 1000;
int max = 10000;
return(_randomNumberProvider.Next(min, max));
}
/// <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);
}
/// <summary>
/// The default captcha protection provider
/// </summary>
public CaptchaCryptoProvider(
IOptions <DNTCaptchaOptions> options,
IRandomNumberProvider randomNumberProvider,
ILogger <CaptchaCryptoProvider> logger)
{
_logger = logger;
_keyBytes = getDesKey(options.Value.EncryptionKey, randomNumberProvider.Next().ToString());
}
/// <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
});
}
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
}));
}
public IList <Product> GetData()
{
var productList = new List <Product>();
for (int i = 0; i < 10; i++)
{
productList.Add(new Product {
Id = i + 1, Title = $"Product {i + 1}", Price = _random.Next(5000, 100000)
});
}
return(productList);
}
public string RandomItem(IEnumerable <string> options)
{
List <KeyValuePair <string, int> > validProbabilities;
lock (_probabilities)
{
validProbabilities = _probabilities.Where(kvp => options.Contains(kvp.Key)).ToList();
}
var upperBound = validProbabilities
.Sum(kvp => kvp.Value);
var cumulativeProbabilities = validProbabilities.GetCumulativeTotals();
var number = _random.Next(0, upperBound);
return(cumulativeProbabilities.SkipWhile(p => number >= p.Value).First().Key);
}
public List <AlgorithmPackage> NextPool()
{
var poolSize = (int)PoolSizeProvider.Next();
var result = new List <AlgorithmPackage>(poolSize);
while (poolSize > 0)
{
var package = new AlgorithmPackage()
{
Id = ++LastAssignedId,
MassKg = MassProvider.Next(),
Income = IncomeProvider.Next(),
DeadlineInTimeUnits = (int)DeadlineProvider.Next(),
};
poolSize--;
result.Add(package);
}
return(result);
}
/// <summary>
/// SumOfTwoNumbers Provider
/// </summary>
public SumOfTwoNumbersProvider(IRandomNumberProvider randomNumberProvider)
{
_randomNumber = randomNumberProvider.Next(1, 7);
}
/// <summary>
/// Creates the captcha image with noise.
/// </summary>
public byte[] DrawCaptcha(string message, float fontSize, string fontName)
{
message = message.Replace(",", string.Empty);
const int margin = 8;
var captchaFont = new Font(fontName, fontSize, FontStyle.Bold, GraphicsUnit.Pixel);
var captchaSize = measureString(message, captchaFont);
var height = (int)captchaSize.Height + margin;
var width = (int)captchaSize.Width + margin;
using (var pic = new Bitmap(width, height, PixelFormat.Format24bppRgb))
{
using (var graphics = Graphics.FromImage(pic))
{
using (var backgroundBrush = new System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.SmallCheckerBoard, Color.DimGray, Color.WhiteSmoke))
graphics.FillRectangle(backgroundBrush, 0, 0, width, height);
var horizontalPosition = 0;
var characterSpacing = (width / message.Length) - 1;
foreach (var item in message)
{
var brush = new SolidBrush(ColorTranslator.FromHtml(colors[_randomNumberProvider.Next(0, colors.Count - 1)]));
var maxVerticalPosition = height - Convert.ToInt32(graphics.MeasureString(item.ToString(), captchaFont).Height);
graphics.DrawString(item.ToString(), captchaFont, brush, horizontalPosition, _randomNumberProvider.Next(0, maxVerticalPosition));
horizontalPosition += characterSpacing + _randomNumberProvider.Next(-1, 1);
}
for (var i = 0; i < 30; i++)
{
var start = _randomNumberProvider.Next(1, 4);
var brush = new SolidBrush(ColorTranslator.FromHtml(colors[_randomNumberProvider.Next(0, colors.Count - 1)]));
graphics.FillEllipse(brush, _randomNumberProvider.Next(start, width), _randomNumberProvider.Next(1, height), _randomNumberProvider.Next(1, 4), _randomNumberProvider.Next(2, 5));
var x0 = _randomNumberProvider.Next(0, width);
var y0 = _randomNumberProvider.Next(0, height);
var x1 = _randomNumberProvider.Next(0, width);
var y1 = _randomNumberProvider.Next(0, height);
graphics.DrawLine(Pens.Black, x0, y0, x1, x1);
}
}
using (var stream = new MemoryStream())
{
distortImage(height, width, pic);
pic.Save(stream, ImageFormat.Png);
return(stream.ToArray());
}
}
}
