I've been reading this tread, and I found it very useful. I'm still new
to Tapestry. How do you use the servlet in your page? What is needed
to set it up?
Thx in advance
On Sunday, April 16, 2006, at 7:50 PM, Konstantin Ignatyev wrote:
>--0-1251190441-1145242250=:93503
>Content-Type: text/plain; charset=iso-8859-1
>Content-Transfer-Encoding: 8bit
>
>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 <[EMAIL PROTECTED]> 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
>>>
>>>
>>> ---------------------------------
>>> Blab-away for as little as 1�/min. Make PC-to-Phone Calls
>>>using Yahoo!
>>> Messenger with Voice.
>>>
>>
>>
>> --
>> J�r�me BERNARD,
>> Kalixia, SARL.
>> http://weblog.kalixia.com
>>
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>>
>>
>>
>> ---------------------------------
>> Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously
>>low rates.
>
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>
>
>__________________________________________________
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>
>
>Konstantin Ignatyev
>
>
>
>
>PS: If this is a typical day on planet earth, humans will add
>fifteen million tons of carbon to the atmosphere, destroy 115 square
>miles of tropical rainforest, create seventy-two miles of desert,
>eliminate between forty to one hundred species, erode seventy-one
>million tons of topsoil, add 2,700 tons of CFCs to the stratosphere,
>and increase their population by 263,000
>
>Bowers, C.A. The Culture of Denial: Why the Environmental Movement
>Needs a Strategy for Reforming Universities and Public Schools. New
>York: State University of New York Press, 1997: (4) (5) (p.206)
>--0-1251190441-1145242250=:93503--
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