<?php declare(strict_types=1);
/**
 * Banker
 *
 * A Caching library implementing psr/cache (PSR 6) and psr/simple-cache (PSR 16)
 *
 * PHP version 7.4+
 *
 * @package     Banker
 * @author      Timothy J. Warren <tim@timshomepage.net>
 * @copyright   2016 - 2021  Timothy J. Warren
 * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
 * @version     3.2.0
 * @link        https://git.timshomepage.net/timw4mail/banker
 */
namespace Aviat\Banker;

use Aviat\Banker\Exception\InvalidArgumentException;

trait KeyValidateTrait {
	/**
	 * @param $keys
	 * @param bool $hash
	 * @throws InvalidArgumentException
	 */
	protected function validateKeys($keys, bool $hash = FALSE): void
	{
		// Check type of keys
		if ( ! is_iterable($keys))
		{
			throw new InvalidArgumentException('Keys must be an array or a traversable object');
		}

		$keys = ($hash) ? array_keys((array)$keys) : (array)$keys;

		// Check each key
		array_walk($keys, fn($key) => $this->validateKey($key));
	}

	/**
	 * @param string $key
	 * @throws InvalidArgumentException
	 */
	protected function validateKey($key): void
	{
		if ( ! is_string($key))
		{
			throw new InvalidArgumentException('Cache key must be a string.');
		}
		else if (preg_match("`[{}()/@:\\\]`", $key) === 1)
		{
			throw new InvalidArgumentException('Invalid characters in cache key');
		}
	}
}