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django-publicauth / publicauth / backends / facebook.py

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from __future__ import absolute_import 

from django.utils.translation import ugettext as _
from django.contrib import auth

from annoying.exceptions import Redirect

from publicauth.backends import BaseBackend
from publicauth import settings


class FacebookBackend(BaseBackend):
    
    def validate_response(self, request):
        if not request.facebook.validate_cookie_signature(request.COOKIES):
            request.flash['error'] = _('Invalid response received from facebook server, please start the authentication process again')
            raise Redirect('publicauth-social-login')
        else:
            uid = request.facebook.api_key
            self.set_identity(int(request.COOKIES.get('%s_user' % uid)))

    def complete(self, request, response):
        extra_fields = [i for i in self.PROFILE_MAPPING]
        extra = request.facebook.users.getInfo([self.get_identity()], extra_fields)[0]
        self.set_profile_fields(request, extra)

        request.session['identity'] = self.get_identity()

        raise Redirect('publicauth-social-extra', 'facebook')