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<?php
declare(strict_types=1);
namespace DigitalCz\DigiSign\Auth;
use DigitalCz\DigiSign\DigiSign;
use LogicException;
use Psr\SimpleCache\CacheInterface;
/**
* Decorator to cache Credentials with PSR-16 CacheInterface
*/
final class CachedCredentials implements Credentials
{
private const PREFIX = 'DGS_tok_';
/** @var Credentials */
private $inner;
/** @var CacheInterface */
private $cache;
public function __construct(Credentials $inner, CacheInterface $cache)
if ($inner instanceof self) {
throw new LogicException('Prevent double decoration');
}
$this->inner = $inner;
$this->cache = $cache;
public function getHash(): string
return self::PREFIX . $this->inner->getHash();
public function provide(DigiSign $dgs): Token
$key = $this->getHash();
if ($this->cache->has($key)) {
return $this->cache->get($key);
$token = $this->inner->provide($dgs);
$this->cache->set($key, $token, $token->getTtl());
return $token;
public function getInner(): Credentials
return $this->inner;
digitalcz /
digisign
