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   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  /*
   6   * The MIT License (MIT)
   7   *
   8   * Copyright (c) 2014-2020 Spomky-Labs
   9   *
  10   * This software may be modified and distributed under the terms
  11   * of the MIT license.  See the LICENSE file for details.
  12   */
  13  
  14  namespace Jose\Component\Signature;
  15  
  16  use InvalidArgumentException;
  17  use Jose\Component\Checker\TokenTypeSupport;
  18  use Jose\Component\Core\JWT;
  19  
  20  final class JWSTokenSupport implements TokenTypeSupport
  21  {
  22      public function supports(JWT $jwt): bool
  23      {
  24          return $jwt instanceof JWS;
  25      }
  26  
  27      /**
  28       * @throws InvalidArgumentException if the signature index does not exist
  29       */
  30      public function retrieveTokenHeaders(JWT $jwt, int $index, array &$protectedHeader, array &$unprotectedHeader): void
  31      {
  32          if (!$jwt instanceof JWS) {
  33              return;
  34          }
  35  
  36          if ($index > $jwt->countSignatures()) {
  37              throw new InvalidArgumentException('Unknown signature index.');
  38          }
  39          $protectedHeader = $jwt->getSignature($index)->getProtectedHeader();
  40          $unprotectedHeader = $jwt->getSignature($index)->getHeader();
  41      }
  42  }