<?php
namespace Illuminate\Cookie;
class CookieValuePrefix
{
/**
* Create a new cookie value prefix for the given cookie name.
*
* @param string $cookieName
* @param string $key
* @return string
*/
public static function create($cookieName, $key)
{
return hash_hmac('sha1', $cookieName.'v2', $key).'|';
}
/**
* Remove the cookie value prefix.
*
* @param string $cookieValue
* @return string
*/
public static function remove($cookieValue)
{
return substr($cookieValue, 41);
}
/**
* Validate a cookie value contains a valid prefix. If it does, return the cookie value with the prefix removed. Otherwise, return null.
*
* @param string $cookieName
* @param string $cookieValue
* @param array $keys
* @return string|null
*/
public static function validate($cookieName, $cookieValue, array $keys)
{
foreach ($keys as $key) {
$hasValidPrefix = str_starts_with($cookieValue, static::create($cookieName, $key));
if ($hasValidPrefix) {
return static::remove($cookieValue);
}
}
}
}