Recaptcha is a free service that helps you protect your forms against spam bots by displaying a picture showing 2 words or playing an audio file telling 8 digits for the visually handicapped. After registration on http://recaptcha.net a private and a public key are generated. Put the keys in settings.py. Find client code for recaptcha at http://pypi.python.org/pypi/recaptcha-client. Put the file captcha.py into application root.
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# settings.py
RECAPTCHA_PUB_KEY = "your public key"
RECAPTCHA_PRIVATE_KEY = "your private key"
# urls.py
from django.conf.urls.defaults import *
urlpatterns = patterns('',
(r'^contact/$', 'myproject.myapp.views.contact'),
)
# views.py
from django.shortcuts import render_to_response
from django.http import HttpResponseRedirect
from django import newforms as forms
from django.conf import settings
import captcha
class ContactForm(forms.Form):
message = forms.CharField()
def contact(request):
if request.method == 'POST':
# Check the captcha
check_captcha = captcha.submit(request.POST['recaptcha_challenge_field'], request.POST['recaptcha_response_field'], settings.RECAPTCHA_PRIVATE_KEY, request.META['REMOTE_ADDR'])
if check_captcha.is_valid is False:
# Captcha is wrong show a error ...
return HttpResponseRedirect('/url/error/')
form = ContactForm(request.POST)
if form.is_valid():
# Do form processing here...
return HttpResponseRedirect('/url/on_success/')
else:
form = ContactForm()
html_captcha = captcha.displayhtml(settings.RECAPTCHA_PUB_KEY)
return render_to_response('contact.html', {'form': form, 'html_captcha': html_captcha})
# contact.html
<form method="post" action="">
{{ form.as_p }}
{{ html_captcha }}
<input type="submit" />
</form>
`
|
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Comments
Absolutely brilliant. Five-minute deploy, soup to nuts.
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Check the captcha
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Oops - the goal of the comment above is to not use the /url/error redirect - instead this lets the user stay on the form but with the captcha redisplayed.
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If you're using shacker's solution you'll probably want to change line 11 from:
html_captcha = captcha.displayhtml(settings.RECAPTCHA_PUB_KEY)
to:
html_captcha = captcha.displayhtml(settings.RECAPTCHA_PUB_KEY, error=check_captcha.error_code )
This will tell the user the error if the catcha is wrong/doesn't work.
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Absolutely brilliant!!
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one must also need to declare html_captch as global variable, or else it doesn't work.
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