Online PHP editor | rfc for 7iuYl

<?php final class JWT { /** * Decodes a JWT string into a PHP object. * * @param string $jwt The JWT * @param string|null $key The secret key * @param bool $verify Don't skip verification process * * @throws UnexpectedValueException Provided JWT was invalid * @throws DomainException Algorithm was not provided * * @return object The JWT's payload as a PHP object * * @uses jsonDecode * @uses urlsafeB64Decode */ public static function decode($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 = self::jsonDecode(self::urlsafeB64Decode($headb64)))) { throw new \UnexpectedValueException('Invalid segment encoding'); } if (null === $payload = self::jsonDecode(self::urlsafeB64Decode($bodyb64))) { throw new \UnexpectedValueException('Invalid segment encoding'); } $sig = self::urlsafeB64Decode($cryptob64); if ($verify) { if (empty($header->alg)) { throw new \DomainException('Empty algorithm'); } if ($sig != self::sign("$headb64.$bodyb64", $key, $header->alg)) { throw new \UnexpectedValueException('Signature verification failed'); } } return $payload; } /** * 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 = ['typ' => 'JWT', 'alg' => $algo]; $segments = []; $segments[] = self::urlsafeB64Encode(self::jsonEncode($header)); $segments[] = self::urlsafeB64Encode(self::jsonEncode($payload)); $signing_input = implode('.', $segments); $signature = self::sign($signing_input, $key, $algo); $segments[] = self::urlsafeB64Encode($signature); return implode('.', $segments); } /** * Sign a string with a given key and algorithm. * * @param string $msg The message to sign * @param string $key The secret key * @param string $method The signing algorithm. Supported * algorithms are 'HS256', 'HS384' and 'HS512' * * @throws DomainException Unsupported algorithm was specified * @return string An encrypted message */ private static function sign($msg, $key, $method = 'HS256') { $methods = [ 'HS256' => 'sha256', 'HS384' => 'sha384', 'HS512' => 'sha512', ]; if (empty($methods[$method])) { throw new \DomainException('Algorithm not supported'); } return hash_hmac($methods[$method], $msg, $key, true); } /** * Decode a JSON string into a PHP object. * * @param string $input JSON string * @throws DomainException Provided string was invalid JSON * @return object Object representation of JSON string */ private static function jsonDecode($input) { $obj = json_decode($input); if (function_exists('json_last_error') && $errno = json_last_error()) { self::_handleJsonError($errno); } elseif ($obj === null && $input !== 'null') { throw new \DomainException('Null result with non-null input'); } return $obj; } /** * Encode a PHP object into a JSON string. * * @param object|array $input A PHP object or array * @throws DomainException Provided object could not be encoded to valid JSON * @return string JSON representation of the PHP object or array */ private static function jsonEncode($input) { $json = json_encode($input); if (function_exists('json_last_error') && $errno = json_last_error()) { self::_handleJsonError($errno); } elseif ($json === 'null' && $input !== null) { throw new \DomainException('Null result with non-null input'); } return $json; } /** * Decode a string with URL-safe Base64. * * @param string $input A Base64 encoded string * @return string A decoded string */ private static function urlsafeB64Decode($input) { $remainder = strlen($input) % 4; if ($remainder) { $padlen = 4 - $remainder; $input .= str_repeat('=', $padlen); } return base64_decode(strtr($input, '-_', '+/')); } /** * Encode a string with URL-safe Base64. * * @param string $input The string you want encoded * @return string The base64 encode of what you passed in */ private static function urlsafeB64Encode($input) { return str_replace('=', '', strtr(base64_encode($input), '+/', '-_')); } /** * Helper method to create a JSON error. * * @param int $errno An error number from json_last_error() * @return void */ private static function _handleJsonError($errno) { $messages = [ JSON_ERROR_DEPTH => 'Maximum stack depth exceeded', JSON_ERROR_CTRL_CHAR => 'Unexpected control character found', JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON', ]; throw new \DomainException( isset($messages[$errno]) ? $messages[$errno] : 'Unknown JSON error: '.$errno ); } } $secret = 'SERVERSIDE_SECRET'; try { $token = JWT::encode(['user_id' => 1], $secret); echo $token.PHP_EOL; // verify if (JWT::decode($token, $secret, true)) { echo 'Token valid'.PHP_EOL; } else { echo 'Token invalid'; } // tampered try { JWT::decode($token.'X', $secret, true); } catch (\Exception $e) { echo $e->getMessage().PHP_EOL; } // decode print_r(JWT::decode($token, $secret)); } catch (\Exception $e) { echo $e->getMessage(); }

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