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<?php if (!defined('FW')) die('Forbidden');
/**
* Used in public callbacks to allow call only from known caller
*
* For e.g. Inside some class is created an instance of FW_Access_Key with unique key 'whatever',
* so nobody else can create another instance with same key, only that class owns that unique key.
* Some public callback (function or method) that wants to allow to be called only by that class,
* sets an requirement that some parameter should be an instance on FW_Access_Key and its key should be 'whatever'
*
* function my_function(FW_Access_Key $key, $another_parameter) {
* if ($key->get_key() !== 'whatever') {
* trigger_error('Call denied', E_USER_ERROR);
* }
*
* //...
* }
*/
final class FW_Access_Key
{
private static $created_keys = array();
private $key;
final public function get_key()
{
return $this->key;
}
/**
* @param string $unique_key unique
*/
final public function __construct($unique_key)
{
if (isset(self::$created_keys[$unique_key])) {
trigger_error('Key "'. $unique_key .'" already defined', E_USER_ERROR);
}
self::$created_keys[$unique_key] = true;
$this->key = $unique_key;
}
}