Prevent Django newcomments spam with Akismet (reloaded)

from django.contrib.comments.moderation import CommentModerator, moderator
from django.contrib.sites.models import Site
from django.conf import settings

class EntryModerator(CommentModerator):
	def check_spam(self, request, comment, key, blog_url=None, base_url=None):
		try:
			from akismet import Akismet
		except:
			return False

		if blog_url is None:
			blog_url = 'http://%s/' % Site.objects.get_current().domain

		ak = Akismet(
			key=settings.AKISMET_API_KEY,
			blog_url=blog_url
		)

		if base_url is not None:
			ak.baseurl = base_url

		if ak.verify_key():
			data = {
				'user_ip': request.META.get('REMOTE_ADDR', '127.0.0.1'),
				'user_agent': request.META.get('HTTP_USER_AGENT', ''),
				'referrer': request.META.get('HTTP_REFERER', ''),
				'comment_type': 'comment',
				'comment_author': comment.user_name.encode('utf-8'),
			}

			if ak.comment_check(comment.comment.encode('utf-8'), data=data, build_data=True):
				return True

		return False

	def allow(self, comment, content_object, request):
		allow = super(EntryModerator, self).allow(comment, content_object, request)

		# change this depending on which spam provider you want to use
		spam = self.check_spam(request, comment,
			key=settings.AKISMET_API_KEY,
		) or self.check_spam(request, comment,
			key=settings.TYPEPAD_ANTISPAM_API_KEY,
			base_url='api.antispam.typepad.com/1.1/'
		)

		return not spam and allow

moderator.register(Entry, EntryModerator)