[jboss-user] [JBoss Seam] - Re: Seam Captcha configuration

[wise_guybg]

While waiting for the team to provide a way to configure captcha I have elaborated a tweak that I want make sure is correct. I have subclassed CaptchaImage like so:


  | @Startup
  | @Scope(APPLICATION)
  | @Name("mycaptchaimage")
  | @Intercept(NEVER)
  | @Install(precedence = BUILT_IN,
  |         classDependencies = "com.octo.captcha.service.image.ImageCaptchaService")
  | public class MyCaptchaImage extends CaptchaImage {
  |     
  |     private ImageCaptchaService service;
  | 
  |     public static MyCaptchaImage instance() {
  |         if (!Contexts.isApplicationContextActive()) {
  |             throw new IllegalStateException("No application context active");
  |         }
  |         return (MyCaptchaImage) Contexts.getApplicationContext().get(MyCaptchaImage.class);
  |     }
  | 
  |     @Override
  |     public void create() {
  |         service = new DefaultManageableImageCaptchaService(
  |                 new FastHashMapCaptchaStore(),
  |                 new MyImageCaptchaEngine(),
  |                 180,
  |                 100000,
  |                 75000);
  |     }
  | 
  |     @Override
  |     protected String getResourcePath() {
  |         return "/mycaptcha";
  |     }
  | 
  |     @Override
  |     public boolean validateResponse(String id, String response) {
  |         try {
  |             return service.validateResponseForID(id, response);
  |         }
  |         catch (CaptchaServiceException cse) {
  |             return false;
  |         }
  |     }
  | 
  |     @Override
  |     public void getResource(HttpServletRequest request, HttpServletResponse response) throws IOException {
  |         ByteArrayOutputStream out = new ByteArrayOutputStream();
  | 
  |         try {
  |             Lifecycle.beginRequest(getServletContext(), request.getSession(), request);
  | 
  |             String captchaId = request.getQueryString();
  | 
  |             BufferedImage challenge = service.getImageChallengeForID(captchaId, request.getLocale());
  | 
  |             ImageIO.write(challenge, "jpeg", out);
  |         }
  |         catch (IllegalArgumentException e) {
  |             response.sendError(HttpServletResponse.SC_NOT_FOUND);
  |             return;
  |         }
  |         catch (CaptchaServiceException e) {
  |             response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
  |             return;
  |         }
  |         finally {
  |             Lifecycle.endRequest();
  |         }
  | 
  |         response.setHeader("Cache-Control", "no-store");
  |         response.setHeader("Pragma", "no-cache");
  |         response.setDateHeader("Expires", 0);
  |         response.setContentType("image/jpeg");
  |         response.getOutputStream().write(out.toByteArray());
  |         response.getOutputStream().flush();
  |         response.getOutputStream().close();
  |     }
  | 
  | }
  | 

The only change in the usage is that now the resource path is /mycaptcha. I have tested it and is seems to work. Is it OK to subclass the component like this?

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