How can I detect multiple logins into a Django web application from different locations?

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Not sure if this is still needed but thought I would share my solution:

1) Install django-tracking (thankyou for that tip Van Gale Google Maps + GeoIP is amazing!)

2) Add this middleware:

from django.contrib.sessions.models import Session
from tracking.models import Visitor
from datetime import datetime

class UserRestrictMiddleware(object):
    """
    Prevents more than one user logging in at once from two different IPs
    """
    def process_request(self, request):
        ip_address = request.META.get('REMOTE_ADDR','')
        try:
            last_login = request.user.last_login
        except:
            last_login = 0
        if unicode(last_login)==unicode(datetime.now())[:19]:
            previous_visitors = Visitor.objects.filter(user=request.user).exclude(ip_address=ip_address)
            for visitor in previous_visitors:
                Session.objects.filter(session_key=visitor.session_key).delete()
                visitor.user = None
                visitor.save()

3) Make sure it goes after the VisitorTrackingMiddleware and you should find previous logins are automatically bumped when someone new logs in 🙂

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