from persistent import Persistent from z3c.form.field import Fields from zope import interface, schema from zope.annotation import factory from zope.annotation.attribute import AttributeAnnotations from zope.component import adapts, provideAdapter from zope.publisher.interfaces.browser import IDefaultBrowserLayer from zope.interface import Interface, implements from plone.z3cform.fieldsets import extensible from plone.z3cform.fieldsets.interfaces import IFormExtender from plone.app.discussion.comment import Comment from plone.app.discussion.browser.comments import CommentForm class ICaptcha(Interface): captcha = schema.TextLine(title=u"Type the word 'human' in all capital letters.", required=False) class Captcha(Persistent): interface.implements(ICaptcha) adapts(Comment) captcha = u"" Captcha = factory(Captcha) provideAdapter(Captcha) provideAdapter(AttributeAnnotations) class CaptchaExtender(extensible.FormExtender): adapts(Interface, IDefaultBrowserLayer, CommentForm) # context, request, form def __init__(self, context, request, form): self.context = context self.request = request self.form = form def update(self): # Add all fields from the captcha interface self.add(ICaptcha, prefix="extra")