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   1  <?php
   2  /**
   3   * This file is part of Lcobucci\JWT, a simple library to handle JWT and JWS
   4   *
   5   * @license http://opensource.org/licenses/BSD-3-Clause BSD-3-Clause
   6   */
   7  
   8  namespace Lcobucci\JWT\Parsing;
   9  
  10  use JsonException;
  11  use Lcobucci\JWT\Encoding\CannotDecodeContent;
  12  use RuntimeException;
  13  
  14  use function json_decode;
  15  use function json_last_error;
  16  use function json_last_error_msg;
  17  
  18  /**
  19   * Class that decodes data according with the specs of RFC-4648
  20   *
  21   * @author Luís Otávio Cobucci Oblonczyk <[email protected]>
  22   * @since 0.1.0
  23   *
  24   * @link http://tools.ietf.org/html/rfc4648#section-5
  25   */
  26  class Decoder
  27  {
  28      /**
  29       * Decodes from JSON, validating the errors (will return an associative array
  30       * instead of objects)
  31       *
  32       * @param string $json
  33       * @return mixed
  34       *
  35       * @throws RuntimeException When something goes wrong while decoding
  36       */
  37      public function jsonDecode($json)
  38      {
  39          if (PHP_VERSION_ID < 70300) {
  40              $data = json_decode($json);
  41  
  42              if (json_last_error() != JSON_ERROR_NONE) {
  43                  throw CannotDecodeContent::jsonIssues(new JsonException(json_last_error_msg()));
  44              }
  45  
  46              return $data;
  47          }
  48  
  49          try {
  50              return json_decode($json, false, 512, JSON_THROW_ON_ERROR);
  51          } catch (JsonException $exception) {
  52              throw CannotDecodeContent::jsonIssues($exception);
  53          }
  54      }
  55  
  56      /**
  57       * Decodes from base64url
  58       *
  59       * @param string $data
  60       * @return string
  61       */
  62      public function base64UrlDecode($data)
  63      {
  64          if ($remainder = strlen($data) % 4) {
  65              $data .= str_repeat('=', 4 - $remainder);
  66          }
  67  
  68          return base64_decode(strtr($data, '-_', '+/'));
  69      }
  70  }