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If you need to use captcha we strongly suggest outsourcing to recaptcha.net

It could not be easier. here is how to:

- register at recaptcha.net (they give you a private_key and a public_key)
- download [this file](http://mdp.cti.depaul.edu/AlterEgo/default/download/document.file.565223690281.py) and save it as models/recaptcha.py
- use the RECAPTCHA helper (defined in file above) as in the following...

Example:

public_key='xxx'  ### provided by recaptcha.net
    private_key='xxx' ### provided by recaptcha.net
    def index():
        form=FORM(RECAPTCHA(request,public_key,private_key),INPUT(_type='submit'))
        if form.accepts(request.vars,session): response.flash='done!'
        elif form.errors.has_key('captcha'): response.flash='invalid capctha'
        else: response.flash='some other error in your form'
        return dict(form=form)

The RECAPTCHA helper works very much as the input helper but it always take (request,public_key,private_key) and validates itself. If it does no pass validation an error message is stored in form.errors['captcha'] but not displayed. It is up to the developer to display the error as appropriate.

AlterEgo

old web2py blog

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