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<?php
namespace ipl\Web\Common;
use ipl\Html\Contract\FormElement;
use ipl\Html\Form;
trait CsrfCounterMeasure
{
/**
* Create a form element to counter measure CSRF attacks
*
* @param string $uniqueId A unique ID that persists through different requests
*
* @return FormElement
*/
protected function createCsrfCounterMeasure($uniqueId)
{
$hashAlgo = in_array('sha3-256', hash_algos(), true) ? 'sha3-256' : 'sha256';
$seed = random_bytes(16);
$token = base64_encode($seed) . '|' . hash($hashAlgo, $uniqueId . $seed);
/** @var Form $this */
return $this->createElement(
'hidden',
'CSRFToken',
[
'ignore' => true,
'required' => true,
'value' => $token,
'validators' => ['Callback' => function ($token) use ($uniqueId, $hashAlgo) {
if (strpos($token, '|') === false) {
die('Invalid CSRF token provided');
}
list($seed, $hash) = explode('|', $token);
if ($hash !== hash($hashAlgo, $uniqueId . base64_decode($seed))) {
die('Invalid CSRF token provided');
}
return true;
}]
]
);
}
}
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