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class/framework/utility/jwt/jwt.php

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<?php
/**
 * 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
 */
namespace Framework\Utility\JWT;
use \DomainException;
use \InvalidArgumentException;
use \UnexpectedValueException;
use \DateTime;
/**
 * The JWT Class
 */
class JWT
{
    private const ASN1_INTEGER = 0x02;
    private const ASN1_SEQUENCE = 0x10;
    private const ASN1_BIT_STRING = 0x03;

    /**
     * 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;
/**
 * @var array Hash algorthms that this supports
 */
    private static $supported_algs = [
        'ES256' => ['openssl', 'SHA256'],
        'HS256' => ['hash_hmac', 'SHA256'],
        'HS512' => ['hash_hmac', 'SHA512'],
        'HS384' => ['hash_hmac', 'SHA384'],
        'RS256' => ['openssl', 'SHA256'],
        'RS384' => ['openssl', 'SHA384'],
        'RS512' => ['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 = []) : object
    {
        $timestamp = is_null(static::$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');
        }
        [$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 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 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 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 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) : string
    {
        $header = ['typ' => 'JWT', 'alg' => $alg];
        if ($keyId !== null) {
            $header['kid'] = $keyId;
        }
        if ( isset($head) && is_array($head) ) {
            $header = array_merge($head, $header);
        }
        $segments = [];
        $segments[] = static::urlsafeB64Encode(static::jsonEncode($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'
     *
     * @throws DomainException Unsupported algorithm was specified
     * @return string
     * @psalm-suppress InvalidNullableReturnType
     */
    public static function sign(string $msg, $key, string $alg = 'HS256') : string
    {
        if (empty(static::$supported_algs[$alg])) {
            throw new DomainException('Algorithm not supported');
        }
        [$function, $algorithm] = static::$supported_algs[$alg];
        switch($function) {
        case 'hash_hmac':
            /** @psalm-suppress PossiblyInvalidArgument */
            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");
            }
            if ($alg === 'ES256') {
                $signature = self::signatureFromDER($signature, 256);
            }
            return $signature;
        default:
            throw new DomainException('Algorithm not supported');
        }
        /* NOT REACHED */
    }

    /**
     * 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(string $msg, string $signature, $key, string $alg) : bool
    {
        if (empty(static::$supported_algs[$alg])) {
            throw new DomainException('Algorithm not supported');
        }

        [$function, $algorithm] = static::$supported_algs[$alg];
        switch($function) {
            case 'openssl':
                $success = openssl_verify($msg, $signature, $key, $algorithm);
                if ($success === 1) {
                    return TRUE;
                }
                if ($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:
                /** @psalm-suppress PossiblyInvalidArgument */
                $hash = hash_hmac($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(string $input) : object
    {
        //if (version_compare(PHP_VERSION, '5.4.0', '>=') && !(defined('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) : string
    {
        $json = json_encode($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(string $input) : string
    {
        $remainder = strlen($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(string $input) : string
    {
        return str_replace('=', '', strtr(base64_encode($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) : void
    {
        $messages = [
            JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
            JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON',
            JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',
            JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON',
            JSON_ERROR_UTF8 => 'Malformed UTF-8 characters' //PHP >= 5.3.3
        ];
        throw new DomainException($messages[$errno] ?? 'Unknown JSON error: ' . $errno);
    }

    /**
     * Get the number of bytes in cryptographic strings.
     *
     * @param string $str
     *
     * @return int
     */
    private static function safeStrlen(string $str) : int
    {
        if (function_exists('mb_strlen')) {
            return mb_strlen($str, '8bit');
        }
        return strlen($str);
    }
/**
 * Convert an ECDSA signature to an ASN.1 DER sequence
 *
 * @param   string $sig The ECDSA signature to convert
 * @return  string The encoded DER object
 */
        private static function signatureToDER($sig) : string
        {
            // Separate the signature into r-value and s-value
            list($r, $s) = \str_split($sig, (int) (\strlen($sig) / 2));
    
            // Trim leading zeros
            $r = \ltrim($r, "\x00");
            $s = \ltrim($s, "\x00");
    
            // Convert r-value and s-value from unsigned big-endian integers to
            // signed two's complement
            if (\ord($r[0]) > 0x7f) {
                $r = "\x00" . $r;
            }
            if (\ord($s[0]) > 0x7f) {
                $s = "\x00" . $s;
            }
    
            return self::encodeDER(
                self::ASN1_SEQUENCE,
                self::encodeDER(self::ASN1_INTEGER, $r) .
                self::encodeDER(self::ASN1_INTEGER, $s)
            );
        }
/**
 * Encodes a value into a DER object.
 *
 * @param   int     $type DER tag
 * @param   string  $value the value to encode
 * @return  string  the encoded object
 */
        private static function encodeDER($type, $value) : string
        {
            $tag_header = 0;
            if ($type === self::ASN1_SEQUENCE) {
                $tag_header |= 0x20;
            }
    
            // Type
            $der = \chr($tag_header | $type);
    
            // Length
            $der .= \chr(\strlen($value));
    
            return $der . $value;
        }
/**
 * Encodes signature from a DER object.
 *
 * @param   string  $der binary signature in DER format
 * @param   int     $keySize the number of bits in the key
 * @return  string  the signature
 */
        private static function signatureFromDER($der, $keySize) : string
        {
            // OpenSSL returns the ECDSA signatures as a binary ASN.1 DER SEQUENCE
            list($offset) = self::readDER($der);
            list($offset, $r) = self::readDER($der, $offset);
            list($offset, $s) = self::readDER($der, $offset);
    
            // Convert r-value and s-value from signed two's compliment to unsigned
            // big-endian integers
            $r = \ltrim($r, "\x00");
            $s = \ltrim($s, "\x00");
    
            // Pad out r and s so that they are $keySize bits long
            $r = \str_pad($r, $keySize / 8, "\x00", STR_PAD_LEFT);
            $s = \str_pad($s, $keySize / 8, "\x00", STR_PAD_LEFT);
    
            return $r . $s;
        }

/**
 * Reads binary DER-encoded data and decodes into a single object
 *
 * @param string $der the binary data in DER format
 * @param int $offset the offset of the data stream containing the object
 * to decode
 * @return array [$offset, $data] the new offset and the decoded object
 */
        private static function readDER($der, $offset = 0) : array
        {
            $pos = $offset;
            $size = \strlen($der);
            $constructed = (\ord($der[$pos]) >> 5) & 0x01;
            $type = \ord($der[$pos++]) & 0x1f;
    
            // Length
            $len = \ord($der[$pos++]);
            if ($len & 0x80) {
                $n = $len & 0x1f;
                $len = 0;
                while ($n-- && $pos < $size) {
                    $len = ($len << 8) | \ord($der[$pos++]);
                }
            }
    
            // Value
            if ($type == self::ASN1_BIT_STRING) {
                $pos += 1; // Skip the first contents octet (padding indicator)
                $data = \substr($der, $pos, $len - 1);
                $pos += $len - 1;
            } elseif (!$constructed) {
                $data = \substr($der, $pos, $len);
                $pos += $len;
            } else {
                $data = null;
            }
    
            return [$pos, $data];
        }
}