How to use Zend Framework Form Hash (token) with AJAX

Question

I have included Zend_Form_Element_Hash into a form multiplecheckbox form. I have jQuery set to fire off an AJAX request when a checkbox is clicked, I pass the token with this AJAX request. The first AJAX request works great, but the subsequent ones fail.

I suspect it may be once the token has been validated it is then removed from the session (hop = 1).

What would be your plan of attack for securing a form with Zend Framework Hash yet using AJAX to complete some of these requests?

Answer 1

I finally abandoned using Zend_Form_Element_Hash and just created a token manually, registered it with Zend_Session and then checked it upon submission.

form.php

$myNamespace = new Zend_Session_Namespace('authtoken');
$myNamespace->setExpirationSeconds(900);
$myNamespace->authtoken = $hash = md5(uniqid(rand(),1));
$auth = new Zend_Form_Element_Hidden('authtoken');
$auth->setValue($hash)
     ->setRequired('true')
     ->removeDecorator('HtmlTag')
     ->removeDecorator('Label');    

controller.php

$mysession = new Zend_Session_Namespace('authtoken');
$hash = $mysession->authtoken;
if($hash == $data['authtoken']){
    print "success";
} else {
    print "you fail";
}

This seems to work and still keeps things relatively sane and secure. I'd still rather use the Hash element, but I can't seem to make it work with AJAX.

Thanks all.