[html-formfu] HTML::FormFu and ReCAPTCHA

[Carl Franks]

2008/8/26 Michele Beltrame <mb at cattlegrid.info>:
> Hi Carl!
>
>> That should work - but formfu won't be aware it's a form field - so it
>> would be a bit of a hack.
>> You could also use a Src element, if you don't want the DIV around the
>> reCAPTCHA markup.
>
> I managed to make this work but, as you said, it turned out to be a real
> dirty hack as the reCAPTCHA code creates two fields of which HTML::FormFu
> can't be aware.
>
>> If you've got the time/inclination - I would suggest asking the author
>> of Captcha::reCAPTCHA if he'd accept a patch to expose the
>> functionality, without having to use the html output.
>> If you were to patch Captcha::reCAPTCHA to do that - I'd be happy to
>> code up a formfu element that to interface with it.
>
> I guess this could be cone. However, checking at the Captcha::reCAPTCHA
> code, is seems quite short and simple - and the most part of it is
> devoted to creating the HTML, which we would need to rewrite anyway. So
> I wonder if it wouldn't be easier to just implement a reCAPTCHA FormFu
> element from scratch.

I've added a reCAPTCHA element to trunk.
In the end, I decided it would be best to use Captcha::reCAPTCHA's
get_html() method, so the formfu form doesn't get messed up with
unnecessary params.

There's a reCAPTCHA constraint that uses Captcha::reCAPTCHA's
check_answer() method.
But don't add the constraint yourself - the element automatically does
it for you.

Basically, you just need to add the element, like so:

    elements:
      - type: reCAPTCHA
        name: recaptcha
        public_key: xxx
        private_key: yyy

The name() is required - you probably won't need to use it anywhere,
but it's needed for the constraint to work - just make sure you set it
to a name that's not used in the current form.

If the user responds correctly, submitted_and_valid() and has_errors()
will pass OK, and you won't see anything recaptcha-related in your
params()

If the user responds incorrectly - the constraint will just cause
submitted_and_valid() and has_errors() to fail.

There's also a recaptcha_options() method which takes a hashref of
options to pass to the reCAPTCHA JS object - e.g. { lang: 'de' }

I've tested it, and it works fine both with JS on and off.
It doesn't support the ajax version, though.
And the test I've created doesn't really test anything properly - just
the expected html.

let me know how it works for you.

Carl