private static string MakeRandomSolution(CaptchaSettingsPart settings)
{
Random rng = new Random();
char[] buf = new char[settings.TotalChars];
for (int i = 0; i < settings.TotalChars; i++)
{
Func <char> RndDigit = () => (char)('0' + rng.Next(10));
Func <char> RndLetter = () => (char)('a' + rng.Next(26));
if (settings.IncDigits && settings.IncLetters)
{
buf[i] = rng.Next(11) > 5 ? RndDigit() : RndLetter();
}
else if (settings.IncDigits)
{
buf[i] = RndDigit();
}
else
{
buf[i] = RndLetter();
}
}
return(new string(buf));
}
public bool IsCaptchaValid(string captchaChallengeValue, string captchaResponseValue, string userHostAddress)
{
_captchaSettings = _orchardServices.WorkContext.CurrentSite.As <CaptchaSettingsPart>();
var captchaValidtor = new Recaptcha.RecaptchaValidator {
PrivateKey = _captchaSettings.PrivateKey,
RemoteIP = userHostAddress,
Challenge = captchaChallengeValue,
Response = captchaResponseValue
};
var recaptchaResponse = captchaValidtor.Validate();
// this will push the result value into a parameter in our Action
return(recaptchaResponse.IsValid);
}
private GraphicsPath DeformPath(GraphicsPath path, CaptchaSettingsPart settings)
{
Double xFreq = 2 * Math.PI / settings.ImageWidth;
Double yFreq = 2 * Math.PI / settings.ImageHeight;
PointF[] deformed = new PointF[path.PathPoints.Length];
Random rng = new Random();
Double xSeed = rng.NextDouble() * 2 * Math.PI;
Double ySeed = rng.NextDouble() * 2 * Math.PI;
for (int i = 0; i < path.PathPoints.Length; i++)
{
PointF original = path.PathPoints[i];
Double val = xFreq * original.X + yFreq * original.Y;
int xOffset = (int)(settings.XAmp * Math.Sin(val + xSeed));
int yOffset = (int)(settings.YAmp * Math.Sin(val + ySeed));
deformed[i] = new PointF(original.X + xOffset, original.Y + yOffset);
}
return(new GraphicsPath(deformed, path.PathTypes));
}
public string GenerateCaptcha()
{
_captchaSettings = _orchardServices.WorkContext.CurrentSite.As <CaptchaSettingsPart>();
var CurrentCulture = _orchardServices.WorkContext.CurrentCulture;
if (_captchaSettings == null)
{
return("CAPTCHA Part Record Was Not Found");
}
var captchaControl = new Recaptcha.RecaptchaControl {
ID = "recaptcha",
PublicKey = _captchaSettings.PublicKey,
PrivateKey = _captchaSettings.PrivateKey,
Theme = _captchaSettings.Theme,
Language = CurrentCulture.Substring(0, 2)
};
string captchaMarkup;
if (captchaControl.Theme.ToLower() != "custom")
{
var htmlWriter = new HtmlTextWriter(new StringWriter());
captchaControl.RenderControl(htmlWriter);
captchaMarkup = htmlWriter.InnerWriter.ToString();
}
else
{
if (_captchaSettings.CustomCaptchaMarkup != string.Empty)
{
captchaMarkup = _captchaSettings.CustomCaptchaMarkup;
}
else
{
captchaMarkup = "<script type=\"text/javascript\">var RecaptchaOptions = {theme: 'custom', custom_theme_widget: 'recaptcha_widget', lang: '" + CurrentCulture.Substring(0, 2) + "' };</script>";
captchaMarkup += "<div id=\"recaptcha_widget\" style=\"display:none\"><div id=\"recaptcha_image\"></div><div class=\"recaptcha_only_if_incorrect_sol\">" + T("Incorrect please try again") + "</div><span class=\"recaptcha_only_if_image\">" + T("Enter the words above") + "</span><span class=\"recaptcha_only_if_audio\">" + T("Enter the numbers you hear:") + "</span><input type=\"text\" id=\"recaptcha_response_field\" name=\"recaptcha_response_field\" /><div><a href=\"javascript:Recaptcha.reload()\">" + T("Get another CAPTCHA") + "</a></div><div class=\"recaptcha_only_if_image\"><a href=\"javascript:Recaptcha.switch_type('audio')\">" + @T("Get an audio CAPTCHA") + "</a></div><div class=\"recaptcha_only_if_audio\"><a href=\"javascript:Recaptcha.switch_type('image')\">" + @T("Get an image CAPTCHA") + "</a></div><div><a href=\"javascript:Recaptcha.showhelp()\">Help</a></div></div><script type=\"text/javascript\" src=\"http://www.google.com/recaptcha/api/challenge?k=" + captchaControl.PublicKey + "\"></script><noscript><iframe src=\"http://www.google.com/recaptcha/api/noscript?k=" + captchaControl.PublicKey + "\" height=\"300\" width=\"500\" frameborder=\"0\"></iframe><br><textarea name=\"recaptcha_challenge_field\" rows=\"3\" cols=\"40\"></textarea><input type=\"hidden\" name=\"recaptcha_response_field\" value=\"manual_challenge\"></noscript>";
}
}
return(captchaMarkup);
}
public FileContentResult GetCaptchaImage(string challengeGuid, int width, int height)
{
// Retrieve the solution text from Session[]
var captcha = HttpContext.Session[CaptchaServiceConstants.SESSION_KEY_PREFIX + challengeGuid] as CaptchaViewModel;
if (captcha != null)
{
//var settings = _orchardServices.WorkContext.CurrentSite.As<CaptchaSettingsPart>();
var settings = new CaptchaSettingsPart();
settings.ImageWidth = width;
settings.ImageHeight = height;
if (settings.Foreground != _foregroundArgb)
{
lock (_padLock)
{
if (settings.Foreground != _foregroundArgb)
{
_foregroundArgb = settings.Foreground;
_foreground.Dispose();
_foreground = new SolidBrush(Color.FromArgb(_foregroundArgb));
}
}
}
if (settings.Background != _backgroundArgb)
{
_backgroundArgb = settings.Background;
_background = Color.FromArgb(_backgroundArgb);
}
// Make a blank canvas to render the CAPTCHA on
using (Bitmap bmp = new Bitmap(settings.ImageWidth, settings.ImageHeight))
using (Graphics g = Graphics.FromImage(bmp))
using (Font font = new Font(settings.ImageFont, 1f))
{
g.Clear(_background);
// Perform trial rendering to determine best font size
SizeF finalSize;
SizeF testSize = g.MeasureString(captcha.Value, font);
float bestFontSize = Math.Min(settings.ImageWidth / testSize.Width,
settings.ImageHeight / testSize.Height) * 0.95f;
using (Font finalFont = new Font(settings.ImageFont, bestFontSize))
{
finalSize = g.MeasureString(captcha.Value, finalFont);
}
// Get a path representing the text centered on the canvas
g.PageUnit = GraphicsUnit.Point;
PointF textTopLeft = new PointF((settings.ImageWidth - finalSize.Width) / 2,
(settings.ImageHeight - finalSize.Height) / 2);
using (GraphicsPath path = new GraphicsPath())
{
path.AddString(captcha.Value, new FontFamily(settings.ImageFont), 0,
bestFontSize, textTopLeft, StringFormat.GenericDefault);
// Render the path to the bitmap
g.SmoothingMode = SmoothingMode.HighQuality;
g.FillPath(_foreground, DeformPath(path, settings));
g.Flush();
// Send the image to the response stream in PNG format
//.ContentType = "image/png";
//using (var memoryStream = new MemoryStream())
//{
// bmp.Save(memoryStream, ImageFormat.Png);
// memoryStream.WriteTo(Response.OutputStream);
// Logger.Log(LogLevel.Debug, null, "111");
//}
// Send the image to the response stream in PNG format
//Response.ContentType = "image/png";
using (var memoryStream = new MemoryStream())
{
//Response.Clear();
bmp.Save(memoryStream, ImageFormat.Png);
return(new FileContentResult(memoryStream.GetBuffer(), "image/png"));
}
}
}
}
return(null);
}
