django-avatar/avatar/__init__.py

import os.path

from django.conf import settings

try:
    from PIL import Image
except ImportError:
    import Image

AUTO_GENERATE_AVATAR_SIZES = getattr(settings, 'AUTO_GENERATE_AVATAR_SIZES', (80,))
AVATAR_RESIZE_METHOD = getattr(settings, 'AVATAR_RESIZE_METHOD', Image.ANTIALIAS)
AVATAR_STORAGE_DIR = getattr(settings, 'AVATAR_STORAGE_DIR', 'avatars')
MAX_MEGABYTES = getattr(settings, 'AVATAR_MAX_FILESIZE', 10)
AVATAR_GRAVATAR_BACKUP = getattr(settings, 'AVATAR_GRAVATAR_BACKUP', True)
AVATAR_DEFAULT_URL = getattr(settings, 'AVATAR_DEFAULT_URL', 
    settings.MEDIA_URL + os.path.join(os.path.dirname(__file__), 'default.jpg'))

from django.db.models import signals
from django.contrib.auth.models import User
from avatar.models import Avatar

def update_email_hash(sender=None, instance=None, **kwargs):
    for avatar in instance.avatar_set.all():
        avatar.save()
signals.post_save.connect(update_email_hash, sender=User)

def create_default_thumbnails(instance=None, created=False, **kwargs):
    if created:
        for size in AUTO_GENERATE_AVATAR_SIZES:
            instance.create_thumbnail(size)
signals.post_save.connect(create_default_thumbnails, sender=Avatar)