human
Solve the following python programming problem given the following code:
@ require_http_methods (['HEAD', 'POST']) 
@ csrf_exempt 
def form_upload(request, username) : 
    class DoXmlFormUpload () : 
        def __init__(self, xml_file, user) : 
            self.xml_file = xml_file 
            self.user = user 
def publish(self) : 
            return publish_xml_form (self.xml_file, self.user) 
form_user = get_object_or_404 (User, username__iexact = username) 
    (profile, created) = UserProfile.objects.get_or_create (user = form_user) 
    authenticator = HttpDigestAuthenticator () 
    if (not authenticator.authenticate (created)) : 
        return authenticator.build_challenge_response () 
if (form_user != request.user) : 
        return HttpResponseForbidden (_ (('Not allowed to upload form[s] to %(user)s account.' % { 
            'user' : form_user, 
}))) 
if (request.method == 'HEAD') : 
        response = OpenRosaResponse (status = 204) 
        response ['Location'] = request.build_absolute_uri ().replace (request.get_full_path (), ('/%s/formUpload' % form_user.username)) 
        return response 
xform_def = request.FILES.get ('form_def_file', None) 
    content = '' 
    if isinstance (xform_def, File) : 
        do_form_upload = DoXmlFormUpload (xform_def, form_user) 
        dd = publish_form (do_form_upload.publish) 
        status = 201 
        if isinstance (dd, XForm) : 
            content = _ (('%s successfully published.' % dd.id_string)) 
else : 
            content = dd ['text'] 
            if isinstance (content, Exception) : 
                content = content.message 
                status = 500 
else : 
                status = 400 
return OpenRosaResponse (content, status = status) 

    
    

    Fix the buggy line: if (not authenticator.authenticate (created)) :
assistant
#Here is Python code to fix the buggy line: if (not authenticator.

if (not authenticator.authenticate (request)) :