Django authentication and Ajax - URLs that require login

def ajax_login_required(view_func):
    def wrap(request, *args, **kwargs):
        if request.user.is_authenticated():
            return view_func(request, *args, **kwargs)
        json = simplejson.dumps({ 'not_authenticated': True })
        return HttpResponse(json, mimetype='application/json')
    wrap.__doc__ = view_func.__doc__
    wrap.__dict__ = view_func.__dict__
    return wrap

@ajax_login_required
def ajax_update_module(request, module_slug, action):
    # Etc ...
    return HttpResponse(json, mimetype='application/json')

$.post('/restricted-url/', data, function(json) {
    if (json.not_authenticated) {
        alert('Not authorized.');  // Or something in a message DIV
        return;
    }
    // Etc ...
});

<a href="{{link}}" onclick="return login_popup()">