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<?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 string $key
* @return string|null
*/
public static function validate($cookieName, $cookieValue, $key)
{
$hasValidPrefix = str_starts_with($cookieValue, static::create($cookieName, $key));
return $hasValidPrefix ? static::remove($cookieValue) : null;
}
}