<?php

namespace Google\Site_Kit_Dependencies\Firebase\JWT;

use DomainException;
use InvalidArgumentException;
use UnexpectedValueException;
use DateTime;
/**
 * JSON Web Token implementation, based on this spec:
 * https://tools.ietf.org/html/rfc7519
 *
 * 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
{
    /**
     * When checking nbf, iat or expiration times,
     * we want to provide some extra leeway time to
     * account for clock skew.
     */
    public static $leeway = 0;
    /**
     * Allow the current timestamp to be specified.
     * Useful for fixing a value within unit testing.
     *
     * Will default to PHP time() value if null.
     */
    public static $timestamp = null;
    public static $supported_algs = array('HS256' => array('hash_hmac', 'SHA256'), 'HS512' => array('hash_hmac', 'SHA512'), 'HS384' => array('hash_hmac', 'SHA384'), 'RS256' => array('openssl', 'SHA256'), 'RS384' => array('openssl', 'SHA384'), 'RS512' => array('openssl', 'SHA512'));
    /**
     * Decodes a JWT string into a PHP object.
     *
     * @param string        $jwt            The JWT
     * @param string|array  $key            The key, or map of keys.
     *                                      If the algorithm used is asymmetric, this is the public key
     * @param array         $allowed_algs   List of supported verification algorithms
     *                                      Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
     *
     * @return object The JWT's payload as a PHP object
     *
     * @throws UnexpectedValueException     Provided JWT was invalid
     * @throws SignatureInvalidException    Provided JWT was invalid because the signature verification failed
     * @throws BeforeValidException         Provided JWT is trying to be used before it's eligible as defined by 'nbf'
     * @throws BeforeValidException         Provided JWT is trying to be used before it's been created as defined by 'iat'
     * @throws ExpiredException             Provided JWT has since expired, as defined by the 'exp' claim
     *
     * @uses jsonDecode
     * @uses urlsafeB64Decode
     */
    public static function decode($jwt, $key, array $allowed_algs = array())
    {
        $timestamp = \is_null(static::$timestamp) ? \time() : static::$timestamp;
        if (empty($key)) {
            throw new \InvalidArgumentException('Key may not be empty');
        }
        $tks = \explode('.', $jwt);
        if (\count($tks) != 3) {
            throw new \UnexpectedValueException('Wrong number of segments');
        }
        list($headb64, $bodyb64, $cryptob64) = $tks;
        if (null === ($header = static::jsonDecode(static::urlsafeB64Decode($headb64)))) {
            throw new \UnexpectedValueException('Invalid header encoding');
        }
        if (null === ($payload = static::jsonDecode(static::urlsafeB64Decode($bodyb64)))) {
            throw new \UnexpectedValueException('Invalid claims encoding');
        }
        if (\false === ($sig = static::urlsafeB64Decode($cryptob64))) {
            throw new \UnexpectedValueException('Invalid signature encoding');
        }
        if (empty($header->alg)) {
            throw new \UnexpectedValueException('Empty algorithm');
        }
        if (empty(static::$supported_algs[$header->alg])) {
            throw new \UnexpectedValueException('Algorithm not supported');
        }
        if (!\in_array($header->alg, $allowed_algs)) {
            throw new \UnexpectedValueException('Algorithm not allowed');
        }
        if (\is_array($key) || $key instanceof \ArrayAccess) {
            if (isset($header->kid)) {
                if (!isset($key[$header->kid])) {
                    throw new \UnexpectedValueException('"kid" invalid, unable to lookup correct key');
                }
                $key = $key[$header->kid];
            } else {
                throw new \UnexpectedValueException('"kid" empty, unable to lookup correct key');
            }
        }
        // Check the signature
        if (!static::verify("{$headb64}.{$bodyb64}", $sig, $key, $header->alg)) {
            throw new \Google\Site_Kit_Dependencies\Firebase\JWT\SignatureInvalidException('Signature verification failed');
        }
        // Check if the nbf if it is defined. This is the time that the
        // token can actually be used. If it's not yet that time, abort.
        if (isset($payload->nbf) && $payload->nbf > $timestamp + static::$leeway) {
            throw new \Google\Site_Kit_Dependencies\Firebase\JWT\BeforeValidException('Cannot handle token prior to ' . \date(\DateTime::ISO8601, $payload->nbf));
        }
        // Check that this token has been created before 'now'. This prevents
        // using tokens that have been created for later use (and haven't
        // correctly used the nbf claim).
        if (isset($payload->iat) && $payload->iat > $timestamp + static::$leeway) {
            throw new \Google\Site_Kit_Dependencies\Firebase\JWT\BeforeValidException('Cannot handle token prior to ' . \date(\DateTime::ISO8601, $payload->iat));
        }
        // Check if this token has expired.
        if (isset($payload->exp) && $timestamp - static::$leeway >= $payload->exp) {
            throw new \Google\Site_Kit_Dependencies\Firebase\JWT\ExpiredException('Expired token');
        }
        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.
     *                                  If the algorithm used is asymmetric, this is the private key
     * @param string        $alg        The signing algorithm.
     *                                  Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
     * @param mixed         $keyId
     * @param array         $head       An array with header elements to attach
     *
     * @return string A signed JWT
     *
     * @uses jsonEncode
     * @uses urlsafeB64Encode
     */
    public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null)
    {
        $header = array('typ' => 'JWT', 'alg' => $alg);
        if ($keyId !== null) {
            $header['kid'] = $keyId;
        }
        if (isset($head) && \is_array($head)) {
            $header = \array_merge($head, $header);
        }
        $segments = array();
        $segments[] = static::urlsafeB64Encode(static::jsonEncode($header));
        $segments[] = static::urlsafeB64Encode(static::jsonEncode($payload));
        $signing_input = \implode('.', $segments);
        $signature = static::sign($signing_input, $key, $alg);
        $segments[] = static::urlsafeB64Encode($signature);
        return \implode('.', $segments);
    }
    /**
     * Sign a string with a given key and algorithm.
     *
     * @param string            $msg    The message to sign
     * @param string|resource   $key    The secret key
     * @param string            $alg    The signing algorithm.
     *                                  Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
     *
     * @return string An encrypted message
     *
     * @throws DomainException Unsupported algorithm was specified
     */
    public static function sign($msg, $key, $alg = 'HS256')
    {
        if (empty(static::$supported_algs[$alg])) {
            throw new \DomainException('Algorithm not supported');
        }
        list($function, $algorithm) = static::$supported_algs[$alg];
        switch ($function) {
            case 'hash_hmac':
                return \hash_hmac($algorithm, $msg, $key, \true);
            case 'openssl':
                $signature = '';
                $success = \openssl_sign($msg, $signature, $key, $algorithm);
                if (!$success) {
                    throw new \DomainException("OpenSSL unable to sign data");
                } else {
                    return $signature;
                }
        }
    }
    /**
     * Verify a signature with the message, key and method. Not all methods
     * are symmetric, so we must have a separate verify and sign method.
     *
     * @param string            $msg        The original message (header and body)
     * @param string            $signature  The original signature
     * @param string|resource   $key        For HS*, a string key works. for RS*, must be a resource of an openssl public key
     * @param string            $alg        The algorithm
     *
     * @return bool
     *
     * @throws DomainException Invalid Algorithm or OpenSSL failure
     */
    private static function verify($msg, $signature, $key, $alg)
    {
        if (empty(static::$supported_algs[$alg])) {
            throw new \DomainException('Algorithm not supported');
        }
        list($function, $algorithm) = static::$supported_algs[$alg];
        switch ($function) {
            case 'openssl':
                $success = \openssl_verify($msg, $signature, $key, $algorithm);
                if ($success === 1) {
                    return \true;
                } elseif ($success === 0) {
                    return \false;
                }
                // returns 1 on success, 0 on failure, -1 on error.
                throw new \DomainException('OpenSSL error: ' . \openssl_error_string());
            case 'hash_hmac':
            default:
                $hash = \hash_hmac($algorithm, $msg, $key, \true);
                if (\function_exists('hash_equals')) {
                    return \hash_equals($signature, $hash);
                }
                $len = \min(static::safeStrlen($signature), static::safeStrlen($hash));
                $status = 0;
                for ($i = 0; $i < $len; $i++) {
                    $status |= \ord($signature[$i]) ^ \ord($hash[$i]);
                }
                $status |= static::safeStrlen($signature) ^ static::safeStrlen($hash);
                return $status === 0;
        }
    }
    /**
     * 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)
    {
        if (\version_compare(\PHP_VERSION, '5.4.0', '>=') && !(\defined('Google\\Site_Kit_Dependencies\\JSON_C_VERSION') && \PHP_INT_SIZE > 4)) {
            /** In PHP >=5.4.0, json_decode() accepts an options parameter, that allows you
             * to specify that large ints (like Steam Transaction IDs) should be treated as
             * strings, rather than the PHP default behaviour of converting them to floats.
             */
            $obj = \json_decode($input, \false, 512, \JSON_BIGINT_AS_STRING);
        } else {
            /** Not all servers will support that, however, so for older versions we must
             * manually detect large ints in the JSON string and quote them (thus converting
             *them to strings) before decoding, hence the preg_replace() call.
             */
            $max_int_length = \strlen((string) \PHP_INT_MAX) - 1;
            $json_without_bigints = \preg_replace('/:\\s*(-?\\d{' . $max_int_length . ',})/', ': "$1"', $input);
            $obj = \json_decode($json_without_bigints);
        }
        if (\function_exists('json_last_error') && ($errno = \json_last_error())) {
            static::handleJsonError($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 $input A PHP object or array
     *
     * @return string JSON representation of the PHP object or array
     *
     * @throws DomainException Provided object could not be encoded to valid JSON
     */
    public static function jsonEncode($input)
    {
        $json = \json_encode($input);
        if (\function_exists('json_last_error') && ($errno = \json_last_error())) {
            static::handleJsonError($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 $input A Base64 encoded string
     *
     * @return string A decoded string
     */
    public static function urlsafeB64Decode($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 $input The string you want encoded
     *
     * @return string The base64 encode of what you passed in
     */
    public static function urlsafeB64Encode($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)
    {
        $messages = array(\JSON_ERROR_DEPTH => 'Maximum stack depth exceeded', \JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON', \JSON_ERROR_CTRL_CHAR => 'Unexpected control character found', \JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON', \JSON_ERROR_UTF8 => 'Malformed UTF-8 characters');
        throw new \DomainException(isset($messages[$errno]) ? $messages[$errno] : 'Unknown JSON error: ' . $errno);
    }
    /**
     * Get the number of bytes in cryptographic strings.
     *
     * @param string
     *
     * @return int
     */
    private static function safeStrlen($str)
    {
        if (\function_exists('mb_strlen')) {
            return \mb_strlen($str, '8bit');
        }
        return \strlen($str);
    }
}