Django: python-social-auth configuration and pipeline

pipeline.py

def update_user_social_data(strategy, *args, **kwargs):
    """Set the name and avatar for a user only if is new.
    """
    print 'update_user_social_data ::', strategy
    if not kwargs['is_new']:
        return

    full_name = ''
    backend = kwargs['backend']

    user = kwargs['user']

    if (
        isinstance(backend, GoogleOAuth2)
        or isinstance(backend, FacebookOAuth2)
    ):
        full_name = kwargs['response'].get('name')
    elif (
        isinstance(backend, LinkedinOAuth)
        or isinstance(backend, TwitterOAuth)
    ):
        if kwargs.get('details'):
            full_name = kwargs['details'].get('fullname')

    user.full_name = full_name

    if isinstance(backend, GoogleOAuth2):
        if response.get('image') and response['image'].get('url'):
            url = response['image'].get('url')
            ext = url.split('.')[-1]
            user.avatar.save(
               '{0}.{1}'.format('avatar', ext),
               ContentFile(urllib2.urlopen(url).read()),
               save=False
            )
    elif isinstance(backend, FacebookOAuth2):
        fbuid = kwargs['response']['id']
        image_name = 'fb_avatar_%s.jpg' % fbuid
        image_url = 'http://graph.facebook.com/%s/picture?type=large' % fbuid
        image_stream = urlopen(image_url)

        user.avatar.save(
            image_name,
            ContentFile(image_stream.read()),
        )
    elif isinstance(backend, TwitterOAuth):
        if kwargs['response'].get('profile_image_url'):
            image_name = 'tw_avatar_%s.jpg' % full_name
            image_url = kwargs['response'].get['profile_image_url']
            image_stream = urlopen(image_url)

            user.avatar.save(
                image_name,
                ContentFile(image_stream.read()),
            )
    elif isinstance(backend, LinkedinOAuth):
        if kwargs['response'].get('pictureUrl'):
            image_name = 'linked_avatar_%s.jpg' % full_name
            image_url = kwargs['response'].get['pictureUrl']
            image_stream = urlopen(image_url)

            user.avatar.save(
                image_name,
                ContentFile(image_stream.read()),
            )
    user.save()

settings.py

# python-social-auth
AUTHENTICATION_BACKENDS = (
    'social.backends.facebook.FacebookOAuth2',
    'social.backends.twitter.TwitterOAuth',
    'social.backends.linkedin.LinkedinOAuth',
    'social.backends.google.GoogleOAuth2',
    'django.contrib.auth.backends.ModelBackend',
)
SOCIAL_AUTH_PIPELINE = (
    'social.pipeline.social_auth.social_details',
    'social.pipeline.social_auth.social_uid',
    'social.pipeline.social_auth.auth_allowed',
    'social.pipeline.social_auth.social_user',
    'social.pipeline.mail.mail_validation',
    'social.pipeline.social_auth.associate_by_email',
    'social.pipeline.user.get_username',
    'social.pipeline.user.create_user',
    'social.pipeline.social_auth.associate_user',
    'social.pipeline.social_auth.load_extra_data',
    'social.pipeline.user.user_details',

    'myapp.pipeline.update_user_social_data',
)
SOCIAL_AUTH_LOGIN_REDIRECT_URL = '/'
SOCIAL_AUTH_FACEBOOK_SCOPE = ['email']
SOCIAL_AUTH_STRATEGY = 'social.strategies.django_strategy.DjangoStrategy'
SOCIAL_AUTH_STORAGE = 'social.apps.django_app.default.models.DjangoStorage'

SOCIAL_AUTH_FACEBOOK_KEY = ''
SOCIAL_AUTH_FACEBOOK_SECRET = ''

SOCIAL_AUTH_TWITTER_KEY = ''
SOCIAL_AUTH_TWITTER_SECRET = ''

SOCIAL_AUTH_LINKEDIN_KEY = ''
SOCIAL_AUTH_LINKEDIN_SECRET = ''

SOCIAL_AUTH_GOOGLE_OAUTH2_KEY = ''
SOCIAL_AUTH_GOOGLE_OAUTH2_SECRET = ''

SOCIAL_AUTH_LINKEDIN_SCOPE = ['r_basicprofile', 'r_emailaddress']
# These fields be requested from linkedin.
SOCIAL_AUTH_LINKEDIN_FIELD_SELECTORS = [
    'email-address',
    'picture-url',
]
SOCIAL_AUTH_LINKEDIN_EXTRA_DATA = [
    ('id', 'id'),
    ('firstName', 'first_name'),
    ('lastName', 'last_name'),
    ('emailAddress', 'email_address'),
    ('public-profile-url', 'public_profile_url'),
]