Adding Captcha to your Pebble blog

I started getting some spam comments on my blog a couple of weeks ago, at a steady increasing rate, which was getting very annoying. Fortunately, I found a very simple way to add captcha validation to the add comments form. Unfortunately, Glen’s solution involved patching the original pebble source and redeploying pebble. There is a better way, as I commented on his blog, which is to modify the  addComment property inside the WEB-INF/classes/action.properties file to point to a new class where you add the captcha functionality. The main advantage of doing this is that you don’t need to redeploy pebble, as you are only adding a new library.

To make things even simpler, I’m making the ‘plugin’ (which is only the new class) available for download. You only need to put this jar in the WEB-INF/lib folder of your pebble deployment, and modify the above property to look like this:

Then restart pebble, and enjoy a spam-free blog, at least until the damn spammers figure out how to deal with captchas.

UPDATE: I forgot to mention that you also need to modify common/jsp/commentsForm.jspf to add the captcha validation:

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