File indexing completed on 2024-12-22 05:33:15

 <?php
 
 /**
  * JSON Web Token implementation, based on this spec:
  * http://tools.ietf.org/html/draft-ietf-oauth-json-web-token-06
  *
  * PHP version 5
  *
  * @category Authentication
  * @package  Authentication_JWT
  * @author   Neuman Vong <neuman@twilio.com>
  * @author   Anant Narayanan <anant@php.net>
  * @license  http://opensource.org/licenses/BSD-3-Clause 3-clause BSD
  * @link     https://github.com/firebase/php-jwt
  */
 class JWT
 {
     /**
      * Decodes a JWT string into a PHP object.
      *
      * @param string      $jwt The JWT
      * @param string|null $key The secret key
      * @param bool        $verify Don't skip verification process
      *
      * @return object      The JWT's payload as a PHP object
      * @throws UnexpectedValueException Provided JWT was invalid
      * @throws DomainException          Algorithm was not provided
      *
      * @uses jsonDecode
      * @uses urlsafeB64Decode
      */
     public static function decode($jwt, $key = null, $verify = true)
     {
         $tks = explode('.', $jwt);
         if (count($tks) != 3) {
             throw new UnexpectedValueException('Wrong number of segments');
         }
         list($headb64, $bodyb64, $cryptob64) = $tks;
         if (null === ($header = JWT::jsonDecode(JWT::urlsafeB64Decode($headb64)))) {
             throw new UnexpectedValueException('Invalid segment encoding');
         }
         if (null === $payload = JWT::jsonDecode(JWT::urlsafeB64Decode($bodyb64))) {
             throw new UnexpectedValueException('Invalid segment encoding');
         }
         $sig = JWT::urlsafeB64Decode($cryptob64);
         if ($verify) {
             if (empty($header->alg)) {
                 throw new DomainException('Empty algorithm');
             }
             if ($sig != JWT::sign("$headb64.$bodyb64", $key, $header->alg)) {
                 throw new UnexpectedValueException('Signature verification failed');
             }
         }
 
         return $payload;
     }
 
     /**
      * Decode a JSON string into a PHP object.
      *
      * @param string $input JSON string
      *
      * @return object          Object representation of JSON string
      * @throws DomainException Provided string was invalid JSON
      */
     public static function jsonDecode($input)
     {
         $obj = json_decode($input);
         if (function_exists('json_last_error') && $errno = json_last_error()) {
             JWT::_handleJsonError($errno);
         } else {
             if ($obj === null && $input !== 'null') {
                 throw new DomainException('Null result with non-null input');
             }
         }
 
         return $obj;
     }
 
     /**
      * Helper method to create a JSON error.
      *
      * @param int $errno An error number from json_last_error()
      *
      * @return void
      */
     private static function _handleJsonError($errno)
     {
         $messages = array(
             JSON_ERROR_DEPTH     => 'Maximum stack depth exceeded',
             JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',
             JSON_ERROR_SYNTAX    => 'Syntax error, malformed JSON'
         );
         throw new DomainException(isset($messages[$errno]) ? $messages[$errno] : 'Unknown JSON error: ' . $errno);
     }
 
     /**
      * Decode a string with URL-safe Base64.
      *
      * @param string $input A Base64 encoded string
      *
      * @return string A decoded string
      */
     public static function urlsafeB64Decode($input)
     {
         $remainder = strlen($input) % 4;
         if ($remainder) {
             $padlen = 4 - $remainder;
             $input .= str_repeat('=', $padlen);
         }
 
         return base64_decode(strtr($input, '-_', '+/'));
     }
 
     /**
      * Sign a string with a given key and algorithm.
      *
      * @param string $msg The message to sign
      * @param string $key The secret key
      * @param string $method The signing algorithm. Supported
      *                       algorithms are 'HS256', 'HS384' and 'HS512'
      *
      * @return string          An encrypted message
      * @throws DomainException Unsupported algorithm was specified
      */
     public static function sign($msg, $key, $method = 'HS256')
     {
         $methods = array(
             'HS256' => 'sha256',
             'HS384' => 'sha384',
             'HS512' => 'sha512',
         );
         if (empty($methods[$method])) {
             throw new DomainException('Algorithm not supported');
         }
 
         return hash_hmac($methods[$method], $msg, $key, true);
     }
 
     /**
      * Converts and signs a PHP object or array into a JWT string.
      *
      * @param object|array $payload PHP object or array
      * @param string       $key The secret key
      * @param string       $algo The signing algorithm. Supported
      *                              algorithms are 'HS256', 'HS384' and 'HS512'
      *
      * @return string      A signed JWT
      * @uses jsonEncode
      * @uses urlsafeB64Encode
      */
     public static function encode($payload, $key, $algo = 'HS256')
     {
         $header = array('typ' => 'JWT', 'alg' => $algo);
         $segments = array();
         $segments[] = JWT::urlsafeB64Encode(JWT::jsonEncode($header));
         $segments[] = JWT::urlsafeB64Encode(JWT::jsonEncode($payload));
         $signing_input = implode('.', $segments);
         $signature = JWT::sign($signing_input, $key, $algo);
         $segments[] = JWT::urlsafeB64Encode($signature);
 
         return implode('.', $segments);
     }
 
     /**
      * Encode a string with URL-safe Base64.
      *
      * @param string $input The string you want encoded
      *
      * @return string The base64 encode of what you passed in
      */
     public static function urlsafeB64Encode($input)
     {
         return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
     }
 
     /**
      * Encode a PHP object into a JSON string.
      *
      * @param object|array $input A PHP object or array
      *
      * @return string          JSON representation of the PHP object or array
      * @throws DomainException Provided object could not be encoded to valid JSON
      */
     public static function jsonEncode($input)
     {
         $json = json_encode($input);
         if (function_exists('json_last_error') && $errno = json_last_error()) {
             JWT::_handleJsonError($errno);
         } else {
             if ($json === 'null' && $input !== null) {
                 throw new DomainException('Null result with non-null input');
             }
         }
 
         return $json;
     }
 
     public static function hashCode($a)
     {
         if ($a == null) {
             return 0;
         }
 
         $result = crc32($a);
 
         return $result;
     }
 
 }