gistfile1.py

def get_avatars(backend, details, response, user=None, is_new=False,
                *args, **kwargs):
    """Update user details using data from provider."""
    if user is None:
        return
    changed = False  # flag to track changes
    try:
        url = None
        if backend.name == 'facebook' and "id" in response:
            url = "http://graph.facebook.com/%s/picture?type=large" \
                  % response["id"]
        elif backend.name == 'twitter':
            url = response.get('profile_image_url', '').replace('_normal', '')
        elif backend.name == 'google-oauth2' and "picture" in response:
            url = response["picture"]
        elif backend.name == 'linkedin' and "picture-url" in response:
            url = response["picture-url"]
        if url:
            avatar = urlopen(url)
            image_basename = slugify(user.username + " social")
            image_name = '%s%s.jpg' % (int(time.time()), image_basename)
            user.avatar.save(image_name, ContentFile(avatar.read()))
            changed = True
    except URLError, HTTPError:
        pass
    if changed:
        user.save()