def authenticate(self, oauth_token, fb_id, name, user_id=None):
"""Authenticates user via Facebook API and saves user information.
"""
try:
# Find existing user
facebook_user = FacebookProfile.objects.get(pk=fb_id, name=name)
user = facebook_user.user
# Update user's access token
facebook_user.oauth_token = oauth_token
facebook_user.save()
# Set last visit to now
user.userprofile.last_visit_date = datetime.now()
user.userprofile.save()
except FacebookProfile.DoesNotExist: # If requested user has not yet been registered
# Create or get User and add FacebookProfile
if user_id == None:
user = User.objects.create_user(fb_id)
user.save()
# Create UserProfile to hold information
userprofile = UserProfile(user=user)
userprofile.save()
else:
user = User.objects.get(pk=user_id)
facebook_user = FacebookProfile(user=user, pk=fb_id, oauth_token=oauth_token)
facebook_user.save()
return user
