<?php
namespace Livewire;
class ComponentChecksumManager
{
public function generate($fingerprint, $memo)
{
$hashKey = app('encrypter')->getKey();
// It's actually Ok if the "children" tracking is tampered with.
// Also, this way JavaScript can modify children as it needs to for
// dom-diffing purposes.
$memoSansChildren = array_diff_key($memo, array_flip(['children']));
$stringForHashing = ''
.json_encode($fingerprint)
.json_encode($memoSansChildren);
return hash_hmac('sha256', $stringForHashing, $hashKey);
}
public function check($checksum, $fingerprint, $memo)
{
return hash_equals($this->generate($fingerprint, $memo), $checksum);
}
}