Index: vendor/firebase/php-jwt/src/JWT.php
===================================================================
--- vendor/firebase/php-jwt/src/JWT.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/firebase/php-jwt/src/JWT.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,667 @@
+<?php
+
+namespace Firebase\JWT;
+
+use ArrayAccess;
+use DateTime;
+use DomainException;
+use Exception;
+use InvalidArgumentException;
+use OpenSSLAsymmetricKey;
+use OpenSSLCertificate;
+use stdClass;
+use UnexpectedValueException;
+
+/**
+ * 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
+{
+    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.
+     *
+     * @var int
+     */
+    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.
+     *
+     * @var ?int
+     */
+    public static $timestamp = null;
+
+    /**
+     * @var array<string, string[]>
+     */
+    public static $supported_algs = [
+        'ES384' => ['openssl', 'SHA384'],
+        'ES256' => ['openssl', 'SHA256'],
+        'ES256K' => ['openssl', 'SHA256'],
+        'HS256' => ['hash_hmac', 'SHA256'],
+        'HS384' => ['hash_hmac', 'SHA384'],
+        'HS512' => ['hash_hmac', 'SHA512'],
+        'RS256' => ['openssl', 'SHA256'],
+        'RS384' => ['openssl', 'SHA384'],
+        'RS512' => ['openssl', 'SHA512'],
+        'EdDSA' => ['sodium_crypto', 'EdDSA'],
+    ];
+
+    /**
+     * Decodes a JWT string into a PHP object.
+     *
+     * @param string                 $jwt            The JWT
+     * @param Key|ArrayAccess<string,Key>|array<string,Key> $keyOrKeyArray  The Key or associative array of key IDs
+     *                                                                      (kid) to Key objects.
+     *                                                                      If the algorithm used is asymmetric, this is
+     *                                                                      the public key.
+     *                                                                      Each Key object contains an algorithm and
+     *                                                                      matching key.
+     *                                                                      Supported algorithms are 'ES384','ES256',
+     *                                                                      'HS256', 'HS384', 'HS512', 'RS256', 'RS384'
+     *                                                                      and 'RS512'.
+     * @param stdClass               $headers                               Optional. Populates stdClass with headers.
+     *
+     * @return stdClass The JWT's payload as a PHP object
+     *
+     * @throws InvalidArgumentException     Provided key/key-array was empty or malformed
+     * @throws DomainException              Provided JWT is malformed
+     * @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(
+        string $jwt,
+        $keyOrKeyArray,
+        ?stdClass &$headers = null
+    ): stdClass {
+        // Validate JWT
+        $timestamp = \is_null(static::$timestamp) ? \time() : static::$timestamp;
+
+        if (empty($keyOrKeyArray)) {
+            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;
+        $headerRaw = static::urlsafeB64Decode($headb64);
+        if (null === ($header = static::jsonDecode($headerRaw))) {
+            throw new UnexpectedValueException('Invalid header encoding');
+        }
+        if ($headers !== null) {
+            $headers = $header;
+        }
+        $payloadRaw = static::urlsafeB64Decode($bodyb64);
+        if (null === ($payload = static::jsonDecode($payloadRaw))) {
+            throw new UnexpectedValueException('Invalid claims encoding');
+        }
+        if (\is_array($payload)) {
+            // prevent PHP Fatal Error in edge-cases when payload is empty array
+            $payload = (object) $payload;
+        }
+        if (!$payload instanceof stdClass) {
+            throw new UnexpectedValueException('Payload must be a JSON object');
+        }
+        $sig = static::urlsafeB64Decode($cryptob64);
+        if (empty($header->alg)) {
+            throw new UnexpectedValueException('Empty algorithm');
+        }
+        if (empty(static::$supported_algs[$header->alg])) {
+            throw new UnexpectedValueException('Algorithm not supported');
+        }
+
+        $key = self::getKey($keyOrKeyArray, property_exists($header, 'kid') ? $header->kid : null);
+
+        // Check the algorithm
+        if (!self::constantTimeEquals($key->getAlgorithm(), $header->alg)) {
+            // See issue #351
+            throw new UnexpectedValueException('Incorrect key for this algorithm');
+        }
+        if (\in_array($header->alg, ['ES256', 'ES256K', 'ES384'], true)) {
+            // OpenSSL expects an ASN.1 DER sequence for ES256/ES256K/ES384 signatures
+            $sig = self::signatureToDER($sig);
+        }
+        if (!self::verify("{$headb64}.{$bodyb64}", $sig, $key->getKeyMaterial(), $header->alg)) {
+            throw new SignatureInvalidException('Signature verification failed');
+        }
+
+        // Check the nbf if it is defined. This is the time that the
+        // token can actually be used. If it's not yet that time, abort.
+        if (isset($payload->nbf) && floor($payload->nbf) > ($timestamp + static::$leeway)) {
+            $ex = new BeforeValidException(
+                'Cannot handle token with nbf prior to ' . \date(DateTime::ISO8601, (int) $payload->nbf)
+            );
+            $ex->setPayload($payload);
+            throw $ex;
+        }
+
+        // Check that this token has been created before 'now'. This prevents
+        // using tokens that have been created for later use (and haven't
+        // correctly used the nbf claim).
+        if (!isset($payload->nbf) && isset($payload->iat) && floor($payload->iat) > ($timestamp + static::$leeway)) {
+            $ex = new BeforeValidException(
+                'Cannot handle token with iat prior to ' . \date(DateTime::ISO8601, (int) $payload->iat)
+            );
+            $ex->setPayload($payload);
+            throw $ex;
+        }
+
+        // Check if this token has expired.
+        if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {
+            $ex = new ExpiredException('Expired token');
+            $ex->setPayload($payload);
+            throw $ex;
+        }
+
+        return $payload;
+    }
+
+    /**
+     * Converts and signs a PHP array into a JWT string.
+     *
+     * @param array<mixed>          $payload PHP array
+     * @param string|resource|OpenSSLAsymmetricKey|OpenSSLCertificate $key The secret key.
+     * @param string                $alg     Supported algorithms are 'ES384','ES256', 'ES256K', 'HS256',
+     *                                       'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'
+     * @param string                $keyId
+     * @param array<string, string> $head    An array with header elements to attach
+     *
+     * @return string A signed JWT
+     *
+     * @uses jsonEncode
+     * @uses urlsafeB64Encode
+     */
+    public static function encode(
+        array $payload,
+        $key,
+        string $alg,
+        ?string $keyId = null,
+        ?array $head = null
+    ): string {
+        $header = ['typ' => 'JWT'];
+        if (isset($head)) {
+            $header = \array_merge($header, $head);
+        }
+        $header['alg'] = $alg;
+        if ($keyId !== null) {
+            $header['kid'] = $keyId;
+        }
+        $segments = [];
+        $segments[] = static::urlsafeB64Encode((string) static::jsonEncode($header));
+        $segments[] = static::urlsafeB64Encode((string) static::jsonEncode($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|OpenSSLAsymmetricKey|OpenSSLCertificate  $key  The secret key.
+     * @param string $alg  Supported algorithms are 'EdDSA', 'ES384', 'ES256', 'ES256K', 'HS256',
+     *                    'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'
+     *
+     * @return string An encrypted message
+     *
+     * @throws DomainException Unsupported algorithm or bad key was specified
+     */
+    public static function sign(
+        string $msg,
+        $key,
+        string $alg
+    ): string {
+        if (empty(static::$supported_algs[$alg])) {
+            throw new DomainException('Algorithm not supported');
+        }
+        list($function, $algorithm) = static::$supported_algs[$alg];
+        switch ($function) {
+            case 'hash_hmac':
+                if (!\is_string($key)) {
+                    throw new InvalidArgumentException('key must be a string when using hmac');
+                }
+                return \hash_hmac($algorithm, $msg, $key, true);
+            case 'openssl':
+                $signature = '';
+                if (!\is_resource($key) && !openssl_pkey_get_private($key)) {
+                    throw new DomainException('OpenSSL unable to validate key');
+                }
+                $success = \openssl_sign($msg, $signature, $key, $algorithm); // @phpstan-ignore-line
+                if (!$success) {
+                    throw new DomainException('OpenSSL unable to sign data');
+                }
+                if ($alg === 'ES256' || $alg === 'ES256K') {
+                    $signature = self::signatureFromDER($signature, 256);
+                } elseif ($alg === 'ES384') {
+                    $signature = self::signatureFromDER($signature, 384);
+                }
+                return $signature;
+            case 'sodium_crypto':
+                if (!\function_exists('sodium_crypto_sign_detached')) {
+                    throw new DomainException('libsodium is not available');
+                }
+                if (!\is_string($key)) {
+                    throw new InvalidArgumentException('key must be a string when using EdDSA');
+                }
+                try {
+                    // The last non-empty line is used as the key.
+                    $lines = array_filter(explode("\n", $key));
+                    $key = base64_decode((string) end($lines));
+                    if (\strlen($key) === 0) {
+                        throw new DomainException('Key cannot be empty string');
+                    }
+                    return sodium_crypto_sign_detached($msg, $key);
+                } catch (Exception $e) {
+                    throw new DomainException($e->getMessage(), 0, $e);
+                }
+        }
+
+        throw new DomainException('Algorithm not supported');
+    }
+
+    /**
+     * 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|OpenSSLAsymmetricKey|OpenSSLCertificate  $keyMaterial For Ed*, ES*, HS*, a string key works. for RS*, must be an instance of OpenSSLAsymmetricKey
+     * @param string $alg         The algorithm
+     *
+     * @return bool
+     *
+     * @throws DomainException Invalid Algorithm, bad key, or OpenSSL failure
+     */
+    private static function verify(
+        string $msg,
+        string $signature,
+        $keyMaterial,
+        string $alg
+    ): bool {
+        if (empty(static::$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, $keyMaterial, $algorithm); // @phpstan-ignore-line
+                if ($success === 1) {
+                    return true;
+                }
+                if ($success === 0) {
+                    return false;
+                }
+                // returns 1 on success, 0 on failure, -1 on error.
+                throw new DomainException(
+                    'OpenSSL error: ' . \openssl_error_string()
+                );
+            case 'sodium_crypto':
+                if (!\function_exists('sodium_crypto_sign_verify_detached')) {
+                    throw new DomainException('libsodium is not available');
+                }
+                if (!\is_string($keyMaterial)) {
+                    throw new InvalidArgumentException('key must be a string when using EdDSA');
+                }
+                try {
+                    // The last non-empty line is used as the key.
+                    $lines = array_filter(explode("\n", $keyMaterial));
+                    $key = base64_decode((string) end($lines));
+                    if (\strlen($key) === 0) {
+                        throw new DomainException('Key cannot be empty string');
+                    }
+                    if (\strlen($signature) === 0) {
+                        throw new DomainException('Signature cannot be empty string');
+                    }
+                    return sodium_crypto_sign_verify_detached($signature, $msg, $key);
+                } catch (Exception $e) {
+                    throw new DomainException($e->getMessage(), 0, $e);
+                }
+            case 'hash_hmac':
+            default:
+                if (!\is_string($keyMaterial)) {
+                    throw new InvalidArgumentException('key must be a string when using hmac');
+                }
+                $hash = \hash_hmac($algorithm, $msg, $keyMaterial, true);
+                return self::constantTimeEquals($hash, $signature);
+        }
+    }
+
+    /**
+     * Decode a JSON string into a PHP object.
+     *
+     * @param string $input JSON string
+     *
+     * @return mixed The decoded JSON string
+     *
+     * @throws DomainException Provided string was invalid JSON
+     */
+    public static function jsonDecode(string $input)
+    {
+        $obj = \json_decode($input, false, 512, JSON_BIGINT_AS_STRING);
+
+        if ($errno = \json_last_error()) {
+            self::handleJsonError($errno);
+        } elseif ($obj === null && $input !== 'null') {
+            throw new DomainException('Null result with non-null input');
+        }
+        return $obj;
+    }
+
+    /**
+     * Encode a PHP array into a JSON string.
+     *
+     * @param array<mixed> $input A PHP array
+     *
+     * @return string JSON representation of the PHP array
+     *
+     * @throws DomainException Provided object could not be encoded to valid JSON
+     */
+    public static function jsonEncode(array $input): string
+    {
+        $json = \json_encode($input, \JSON_UNESCAPED_SLASHES);
+        if ($errno = \json_last_error()) {
+            self::handleJsonError($errno);
+        } elseif ($json === 'null') {
+            throw new DomainException('Null result with non-null input');
+        }
+        if ($json === false) {
+            throw new DomainException('Provided object could not be encoded to valid JSON');
+        }
+        return $json;
+    }
+
+    /**
+     * Decode a string with URL-safe Base64.
+     *
+     * @param string $input A Base64 encoded string
+     *
+     * @return string A decoded string
+     *
+     * @throws InvalidArgumentException invalid base64 characters
+     */
+    public static function urlsafeB64Decode(string $input): string
+    {
+        return \base64_decode(self::convertBase64UrlToBase64($input));
+    }
+
+    /**
+     * Convert a string in the base64url (URL-safe Base64) encoding to standard base64.
+     *
+     * @param string $input A Base64 encoded string with URL-safe characters (-_ and no padding)
+     *
+     * @return string A Base64 encoded string with standard characters (+/) and padding (=), when
+     * needed.
+     *
+     * @see https://www.rfc-editor.org/rfc/rfc4648
+     */
+    public static function convertBase64UrlToBase64(string $input): string
+    {
+        $remainder = \strlen($input) % 4;
+        if ($remainder) {
+            $padlen = 4 - $remainder;
+            $input .= \str_repeat('=', $padlen);
+        }
+        return \strtr($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), '+/', '-_'));
+    }
+
+
+    /**
+     * Determine if an algorithm has been provided for each Key
+     *
+     * @param Key|ArrayAccess<string,Key>|array<string,Key> $keyOrKeyArray
+     * @param string|null            $kid
+     *
+     * @throws UnexpectedValueException
+     *
+     * @return Key
+     */
+    private static function getKey(
+        $keyOrKeyArray,
+        ?string $kid
+    ): Key {
+        if ($keyOrKeyArray instanceof Key) {
+            return $keyOrKeyArray;
+        }
+
+        if (empty($kid) && $kid !== '0') {
+            throw new UnexpectedValueException('"kid" empty, unable to lookup correct key');
+        }
+
+        if ($keyOrKeyArray instanceof CachedKeySet) {
+            // Skip "isset" check, as this will automatically refresh if not set
+            return $keyOrKeyArray[$kid];
+        }
+
+        if (!isset($keyOrKeyArray[$kid])) {
+            throw new UnexpectedValueException('"kid" invalid, unable to lookup correct key');
+        }
+
+        return $keyOrKeyArray[$kid];
+    }
+
+    /**
+     * @param string $left  The string of known length to compare against
+     * @param string $right The user-supplied string
+     * @return bool
+     */
+    public static function constantTimeEquals(string $left, string $right): bool
+    {
+        if (\function_exists('hash_equals')) {
+            return \hash_equals($left, $right);
+        }
+        $len = \min(self::safeStrlen($left), self::safeStrlen($right));
+
+        $status = 0;
+        for ($i = 0; $i < $len; $i++) {
+            $status |= (\ord($left[$i]) ^ \ord($right[$i]));
+        }
+        $status |= (self::safeStrlen($left) ^ self::safeStrlen($right));
+
+        return ($status === 0);
+    }
+
+    /**
+     * Helper method to create a JSON error.
+     *
+     * @param int $errno An error number from json_last_error()
+     *
+     * @throws DomainException
+     *
+     * @return void
+     */
+    private static function handleJsonError(int $errno): void
+    {
+        $messages = [
+            JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
+            JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON',
+            JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',
+            JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON',
+            JSON_ERROR_UTF8 => 'Malformed UTF-8 characters' //PHP >= 5.3.3
+        ];
+        throw new DomainException(
+            isset($messages[$errno])
+            ? $messages[$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(string $sig): string
+    {
+        // Separate the signature into r-value and s-value
+        $length = max(1, (int) (\strlen($sig) / 2));
+        list($r, $s) = \str_split($sig, $length);
+
+        // 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(int $type, string $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(string $der, int $keySize): string
+    {
+        // OpenSSL returns the ECDSA signatures as a binary ASN.1 DER SEQUENCE
+        list($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{int, string|null} the new offset and the decoded object
+     */
+    private static function readDER(string $der, int $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++; // 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];
+    }
+}
