Log username in Apache access logs

class LogRemoteUserMiddleware(object):
    """
    Middleware for logging the session user in Apache. This sets the username
    information so that Apache is aware of the logged in user and can log
    the username in the access_log (just like when the user is logged in
    with basic authentication).
    """

    def process_request(self, request):
        # AuthenticationMiddleware is required so that request.user exists
        if not hasattr(request, 'user'):
            raise ImproperlyConfigured(
                "LogRemoteUserMiddleware requires AuthenticationMiddleware"
                " to be in MIDDLEWARE_CLASSES before LogRemoteUserMiddleware.")
        # set the REMOTE_USER variable if a user is logged in
        if request.user.is_authenticated():
            # specific for mod_python
            if isinstance(request, ModPythonRequest):
                request._req.user = str(request.user.username)