Is there any solutions to add captcha to Django-allauth?

I too needed to do this with django-allauth and found that implementing the django-recaptcha package to be relatively simple.

Configure django-recaptcha

Sign up for a recaptcha account.

Plug your settings in

# settings.py

RECAPTCHA_PUBLIC_KEY = 'xyz'
RECAPTCHA_PRIVATE_KEY = 'xyz'

RECAPTCHA_USE_SSL = True     # Defaults to False

Customize SignupForm

After installing django-recaptcha, I followed someguidelines for customizing the SignupForm.

from django import forms
from captcha.fields import ReCaptchaField

class AllAuthSignupForm(forms.Form):

    captcha = ReCaptchaField()

    def save(self, request, user):
        user = super(AllAuthSignupForm, self).save(request)
        return user

You also need to tell allauth to inherit from this form in settings.py

ACCOUNT_SIGNUP_FORM_CLASS = 'myapp.forms.AllAuthSignupForm'

Wire up signup form template

{{ form.captcha }} and {{ form.captcha.errors }} should be available on the signup template context at this point.

That was it! Seems like all the validation logic is tucked into the ReCaptchaField.

To get the ReCaptcha field to the bottom of the form, simply add the other fields before the captcha field. So what was user, email, captcha, password1, password2 becomes user, email, password1, password2, captcha with this form:

from allauth.account.forms import SignupForm, PasswordField
from django.utils.translation import ugettext_lazy as _
from captcha.fields import ReCaptchaField

class UpdatedSignUpForm(SignupForm):
    password1 = PasswordField(label=_("Password"))
    password2 = PasswordField(label=_("Password (again)"))
    captcha = ReCaptchaField()

    def save(self, request):
        user = super(UpdatedSignUpForm, self).save(request)
        return user

You then just need to add this form into the settings.py file as described in the previous answer.