code required to connect to Facebook in python / django

facebook-connect.py

import urllib

from django.http import HttpResponseRedirect
from django.conf import settings
from django.contrib.auth import login as auth_login
from django.contrib.auth import authenticate
from django.core.urlresolvers import reverse

# Step 1. when facebook login is clicked, this function is hit
# Things to know: we have an app_id and app_secret from facebook for out app / site
# We have the main domain name of our site registered with facebook as facebook only 
# accepts callback urls that are from the registered domain name
def login(request):
    """ First step of process, redirects user to facebook, which redirects to authentication_callback. """

    args = {
        'client_id': settings.FACEBOOK_APP_ID,
        'scope': settings.FACEBOOK_SCOPE,
        'redirect_uri': request.build_absolute_uri('/facebook/authentication_callback'),
    }
    return HttpResponseRedirect('https://www.facebook.com/dialog/oauth?' + urllib.urlencode(args))

# Step 2. facebook comes back and calls this fuction with a code
def authentication_callback(request):
    """ Second step of the login process.
    It reads in a code from Facebook, then redirects back to the home page. """
    
    # todo: make sure the code exist before accessing it, user haskey() or try:
    code = request.GET.get('code')

    args = {
        'client_id': settings.FACEBOOK_APP_ID,
        'client_secret': settings.FACEBOOK_APP_SECRET,
        'redirect_uri': request.build_absolute_uri('/facebook/authentication_callback'),
        'code': code,
    }

    # Get a legit access token
    target = urllib.urlopen('https://graph.facebook.com/oauth/access_token?' + urllib.urlencode(args)).read()
    # no json return, so just parse and take the value
    response = cgi.parse_qs(target)
    access_token = response['access_token'][-1]

    # Read the user's profile information
    fb_profile = urllib.urlopen('https://graph.facebook.com/me?access_token=%s' % access_token)
    # json format, deal with it as such
    fb_profile = json.load(fb_profile)

    # now you have the user info, do something with it, login user, force a user setup, or whatever you like
    
    return ''