Whoops I forgot to mention that I actually had to create the servlet code,
but it's included in the JCaptcha example...
----- Original Message -----
From: "Oscar Picasso" <[EMAIL PROTECTED]>
To: "Tapestry users" <tapestry-user@jakarta.apache.org>
Sent: Monday, April 17, 2006 5:41 AM
Subject: Re: Looking for a CATCHPA
I'm going to try it in my application. Thanks.
Konstantin Ignatyev <[EMAIL PROTECTED]> wrote: Just did the following
and it seems to work beautifully
public class JCaptchaServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
String captchaID = request.getSession(true).getId();
// call the ManageableImageCaptchaService methods
byte[] captchaChallengeAsJpeg = null;
ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
try {
ImageCaptchaService srv = App.getCaptchaService();
BufferedImage challenge = srv.getImageChallengeForID(captchaID,
request.getLocale());
Object challengeString = srv.getQuestionForID(captchaID,
request.getLocale());
// the output stream to render the captcha image as jpeg into
// a jpeg encoder
JPEGImageEncoder jpegEncoder =
JPEGCodec.createJPEGEncoder(jpegOutputStream);
jpegEncoder.encode(challenge);
} catch (IllegalArgumentException e) {
// log a security warning and return a 404...
// if (log.isWarnEnabled())
// {
// log.warn(
// "There was a try from "
// + request.getRemoteAddr()
// + " to render an URL without ID"
// + " or with a too long one");
// theResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
// }
} catch (CaptchaServiceException e) {
// log and return a 404 instead of an image...
// log.warn(
// "Error trying to generate a captcha and "
// + "render its challenge as JPEG",
// e);
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
// render the captcha challenge as a JPEG image in the response
response.setHeader("Cache-Control", "no-store");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
ServletOutputStream responseOutputStream =
response.getOutputStream();
responseOutputStream.write(captchaChallengeAsJpeg);
}
}
------------
private static ImageCaptchaService captchaService;
private static Object captchaGuard = new Object();
public static ImageCaptchaService getCaptchaService() {
synchronized (captchaGuard) {
if (captchaService == null) {
captchaService = new EhcacheManageableImageCaptchaService( new
SimpleListImageCaptchaEngine() , 180, 100000){
};
}
return captchaService;
}
}
----------------------
Validation
@InjectObject( "service:tapestry.globals.HttpServletRequest")
public abstract HttpServletRequest getHttpRequest();
............
if( App.getCaptchaService().validateResponseForID(
getHttpRequest().getSession(true).getId(), getCaptchaAnswer() )){
System.out.println("CAPTCHA - Pass");
}else{
Oscar Picasso wrote: Do you have a code example of such an
ImageCaptchaServlet?
Daniel Lydiard wrote: I'm using Jcaptcha with my tapestry application.
1. Load the ImageCaptchaServlet in your web.xml.
jcaptcha
com.foo.ImageCaptchaServlet
1
jcaptcha
/jcaptcha
2. Do something like this in a component class method to get the captcha
question.
captchaId = getPage().getRequest().getSession(true).getId();
return CaptchaServiceSingleton.getInstance().getQuestionForID(captchaId);
3. Point to the servlet for the captchaimage in your component .
4. To validate the user response
captchaId = getRequest().getSession(true).getId();
return
CaptchaServiceSingleton.getInstance().validateResponseForID(captchaId,
userResponse);
Hope this helps.
----- Original Message -----
From: "Oscar Picasso"
To: "Tapestry users"
Sent: Sunday, April 16, 2006 11:47 AM
Subject: Re: Looking for a CATCHPA
I have taken a look. But I have no idea where to start. The api javadoc
has
only one class: JCaptchaCommentAuthenticator. It seems there is a problem
with the site.
Have you worked with JCaptcha? And do you know where to start?
Oscar
J�r�me BERNARD wrote: Have a loot at
http://jcaptcha.sourceforge.net/
Regards,
J�r�me.
On 4/16/06, Oscar Picasso wrote:
Hi,
I'm looking for a CATCHPA library to use with my Tapestry application.
I'm looking for something easy to use and efficient.
I welcome any advice.
Oscar
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--
J�r�me BERNARD,
Kalixia, SARL.
http://weblog.kalixia.com
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