apacherecaptchawicket-1.5

Can I use RE-Captcha with Wicket?

Can I use recaptcha with apache wicket 1.5.3? Is there some good example?

Solution

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    I have added the guide here in case page disappears.

    Usage

    We will create a panel called RecaptchaPanel. In order to use this component to your application all you'll have to do is this:

    add(new RecaptchaPanel("recaptcha"));

    and of course, add the component in your markup:

    <div wicket:id="recaptcha"></div>

    Implementation

    Implementation is simple. All you have to do, is to follow several steps:

    Add recaptcha dependency to your project

    <dependency>
 <groupid>net.tanesha.recaptcha4j</groupid>
 <artifactid>recaptcha4j</artifactid>
 <version>0.0.7</version>
</dependency>

    This library hides the implementation details and expose an API for dealing with recaptcha service.

    Create associated markup (RecaptchaPanel.html)

    <wicket:panel><div wicket:id="captcha"></div></wicket:panel>

    Create RecaptchaPanel.java

    import net.tanesha.recaptcha.ReCaptcha;
import net.tanesha.recaptcha.ReCaptchaFactory;
import net.tanesha.recaptcha.ReCaptchaImpl;
import net.tanesha.recaptcha.ReCaptchaResponse;

/**
 * Displays recaptcha widget. It is configured using a pair of public/private keys which can be registered at the
 * following location:
 * 
* https://www.google.com/recaptcha/admin/create
 * <br>
 * More details about recaptcha API: http://code.google.com/apis/recaptcha/intro.html
 *
 * @author Alex Objelean
 */
@SuppressWarnings("serial")
public class RecaptchaPanel extends Panel {
  private static final Logger LOG = LoggerFactory.getLogger(RecaptchaPanel.class);
  @SpringBean
  private ServiceProvider serviceProvider;


  public RecaptchaPanel(final String id) {
    super(id);
    final ReCaptcha recaptcha = ReCaptchaFactory.newReCaptcha(serviceProvider.getSettings().getRecaptchaPublicKey(),
      serviceProvider.getSettings().getRecaptchaPrivateKey(), false);
    add(new FormComponent<void>("captcha") {
      @Override
      protected void onComponentTagBody(final MarkupStream markupStream, final ComponentTag openTag) {
        replaceComponentTagBody(markupStream, openTag, recaptcha.createRecaptchaHtml(null, null));
      }

      @Override
      public void validate() {
        final WebRequest request = (WebRequest)RequestCycle.get().getRequest();

        final String remoteAddr = request.getHttpServletRequest().getRemoteAddr();
        final ReCaptchaImpl reCaptcha = new ReCaptchaImpl();
        reCaptcha.setPrivateKey(serviceProvider.getSettings().getRecaptchaPrivateKey());

        final String challenge = request.getParameter("recaptcha_challenge_field");
        final String uresponse = request.getParameter("recaptcha_response_field");
        final ReCaptchaResponse reCaptchaResponse = reCaptcha.checkAnswer(remoteAddr, challenge, uresponse);

        if (!reCaptchaResponse.isValid()) {
          LOG.debug("wrong captcha");
          error("Invalid captcha!");
        }
      }
    });
  }
}
</void>

    Things to notice: