silva.captcha

This is a captcha support for Silva. It works with the help of skimpyGimpy.

After installing the extension, you can either use a zeam.form widget, a Formulator widget or ask the captcha directly.

You can get the captcha image in your template the following way:

<tal:captcha tal:define="captcha nocall:here/@@captcha"
             tal:content="structure captcha/image_tag">
</tal:captcha>

You can get the captcha as a sound file like this:

<div class="captchaAudio"
     tal:define="captcha nocall:here/@@captcha">
   <a href="#" target="_blank"
      tal:attributes="href captcha/audio_url">Audio version</a>
</div>

You can validate an captcha entry in Python like this:

from zope.component import getMultiAdapter


captcha = getMultiAdapter((self.context, self.request), name='captcha')
if not captcha.verify(input):
    # Bad value
else:
    # Good value

This extension require at least Silva 2.3 or higher. For previous version of Silva, you can use previous versions of the extension.

from silva.captcha import validate

request = context.REQUEST
input = request.form.get('captcha_field', None)
if not validate(context, request, input):
    # Bad value
else:
    # Good value