Unobtrusive comment moderation

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from django.conf import settings
from django.db.models import signals
from django.dispatch import dispatcher
from django.contrib.comments.models import Comment, FreeComment
from django.contrib.sites.models import Site

def moderate_comments(sender, instance):
    """
    Applies comment moderation to newly-posted comments.
    
    Moderation happens in two phases:
    
        1. If the object the comment is being posted on has a method
           named ``comments_open``, it will be called; if the return
           value evaluates to ``False``, the comment's ``is_public``
           field will be set to ``False`` and no further processing
           will be done.
    
        2. If the object did not have a ``comments_open`` method, or
           if that method's return value evaluated to ``True``, then
           the comment will be submitted to Akismet for a spam check,
           and if Akismet thinks the comment is spam, then its
           ``is_public`` field will be set to ``False``.
    
    """
    if not instance.id: # Only check when the comment is first saved.
        content_object = instance.get_content_object()
        comments_open = getattr(content_object, 'comments_open', None)
        if callable(comments_open) and not comments_open():
            instance.is_public = False
        elif hasattr(settings, 'AKISMET_API_KEY') and settings.AKISMET_API_KEY:
            from akismet import Akismet
            akismet_api = Akismet(key=settings.AKISMET_API_KEY,
                                  blog_url='http://%s/' % Site.objects.get_current().domain)
            if akismet_api.verify_key():
                akismet_data = { 'comment_type': 'comment',
                                 'referrer': '',
                                 'user_ip': instance.ip_address,
                                 'user_agent': '' }
                if akismet_api.comment_check(instance.comment, data=akismet_data, build_data=True):
                    instance.is_public = False

dispatcher.connect(moderate_comments, sender=Comment, signal=signals.pre_save)
dispatcher.connect(moderate_comments, sender=FreeComment, signal=signals.pre_save)

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Comments

jeffwheeler (on March 17, 2007):

This is wonderful. I just learned about Django’s use of Signals today, and this is one of the first things to come to mind (after threading with the API calls I made earlier, of course).

I really like this function; it definitely seems like the cleanest way to do this.

I think it's also very similar to how the Askimet plugin for WordPress works.

#

rajeshd (on April 18, 2007):

James,

Just wanted to say that this is very useful. I love innovative applications of Django's signals!

-Rajesh

#

jheasly (on June 13, 2007):

When you say

Put this code -- both the function and the dispatcher calls -- somewhere in your project that's guaranteed to be imported early

do you mean like somewhere (up high) in views.py?

#

ubernostrum (on June 18, 2007):

The best place is in a models file or the __init__.py of an application.

#

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