Introduction

collective.z3cform.norobots provides a “human” captcha widget based on a list of questions/answers.

This captcha can be used as a plone.app.discussiom captcha plugin.

The widget is based on z3c.form.TextWidget.

Requirements

• tested with Plone 4.0 as a plugin for plone.app.discussion, should work with Plone 3

• plone.app.z3cform

Installation

Just a simple easy_install collective.z3cform.norobots is enough.

Alternatively, buildout users can install collective.z3cform.norobots as part of a specific project’s buildout, by having a buildout configuration such as:

[buildout]
...
eggs =
    collective.z3cform.norobots
...
[instance]
...
zcml =
    collective.z3cform.norobots

In portal_setup, apply the profile collective.z3cform.norobots:default.

Add a new question

In the Plone Property Sheet “norobots_properties” (portal_properties/norobots_properties), add a new property:

Name: The question id (ex: "question4")
Value: your_question::the_answer (ex: "What is 10 + 12 ?::22")
Type: string

Answer can contain multiple values delimited by semicolon:

Name: The question id (ex: "question8")
Value: your_question::the_answer;another_answer (ex: "What is 5 + 5 ?::10;ten")
Type: string

Usage

You can use this widget setting the “widgetFactory” property of a form field:

from zope import interface, schema
from z3c.form import interfaces, form, field, button, validator
from plone.app.z3cform.layout import wrap_form

from collective.z3cform.norobots.i18n import MessageFactory as _
from collective.z3cform.norobots.widget import NorobotsFieldWidget
from collective.z3cform.norobots.validator import NorobotsValidator

class INorobotsForm(interface.Interface):
    norobots = schema.TextLine(title=_(u'Are you a human ?'),
                               description=_(u'In order to avoid spam, please answer the question below.'),
                               required=True)

class NorobotsForm(form.Form):
    fields = field.Fields(INorobotsForm)
    fields['norobots'].widgetFactory = NorobotsFieldWidget

# wrap the form with plone.app.z3cform's Form wrapper
NorobotsFormView = wrap_form(NorobotsForm)

# Register Norobots validator for the correponding field in the IContactInfo interface
validator.WidgetValidatorDiscriminators(NorobotsValidator, field=INorobotsForm['norobots'])

for more information see contact_info.py in the plone_forms directory in the package.

Credits

• Planet Makina Corpus

• Contact us

Changelog