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<?php |
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/** |
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* @author Patsura Dmitry https://github.com/ovr <[email protected]> |
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*/ |
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namespace SocialConnect\OpenIDConnect; |
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use SocialConnect\OpenIDConnect\Exception\InvalidJWT; |
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use SocialConnect\OpenIDConnect\Exception\UnsupportedSignatureAlgoritm; |
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class JWT |
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{ |
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/** |
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* Map of supported algorithms |
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* |
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* @var array |
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*/ |
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public static $algorithms = array( |
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// HS |
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'HS256' => ['hash_hmac', MHASH_SHA256], |
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'HS384' => ['hash_hmac', MHASH_SHA384], |
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'HS512' => ['hash_hmac', MHASH_SHA512], |
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// RS |
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'RS256' => ['openssl', OPENSSL_ALGO_SHA256], |
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'RS384' => ['openssl', OPENSSL_ALGO_SHA384], |
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'RS512' => ['openssl', OPENSSL_ALGO_SHA512], |
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); |
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/** |
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* @var array |
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*/ |
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protected $parts; |
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/** |
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* @var array |
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*/ |
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protected $header; |
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/** |
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* @var array |
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*/ |
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protected $payload; |
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/** |
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* @var string |
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*/ |
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protected $signature; |
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/** |
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* @param string $input |
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* @return string |
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*/ |
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public static function urlsafeB64Decode($input) |
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{ |
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$remainder = strlen($input) % 4; |
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if ($remainder) { |
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$padlen = 4 - $remainder; |
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$input .= str_repeat('=', $padlen); |
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} |
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return base64_decode(strtr($input, '-_', '+/')); |
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} |
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/** |
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* @param string $token |
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* @param array $keys |
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* @throws InvalidJWT |
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*/ |
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public function __construct($token, array $keys) |
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{ |
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$parts = explode('.', $token); |
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if (count($parts) !== 3) { |
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throw new InvalidJWT('Wrong number of segments'); |
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} |
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list ($header64, $payload64, $token64) = $parts; |
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$headerPayload = base64_decode($header64, true); |
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$this->header = json_decode($headerPayload); |
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$decodedPayload = base64_decode($payload64, true); |
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$this->payload = json_decode($decodedPayload); |
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$this->signature = self::urlsafeB64Decode($token64); |
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$this->validate("{$header64}.{$payload64}", $keys); |
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} |
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/** |
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* @param string $data |
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* @param array $keys |
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* @throws InvalidJWT |
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*/ |
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protected function validate($data, array $keys) |
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{ |
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if (!isset($this->header->alg)) { |
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throw new InvalidJWT('No alg inside header'); |
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} |
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if (!isset($this->header->kid)) { |
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throw new InvalidJWT('No kid inside header'); |
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} |
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$result = $this->verifySignature($data, $keys); |
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if (!$result) { |
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throw new InvalidJWT('Unexpected signature'); |
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} |
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} |
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/** |
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* @param array $keys |
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* @param string $kid |
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* @return JWK |
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* @throws \RuntimeException |
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*/ |
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protected function findKeyByKind(array $keys, $kid) |
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{ |
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foreach ($keys as $key) { |
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if ($key['kid'] === $kid) { |
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return new JWK($key); |
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} |
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} |
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throw new \RuntimeException('Unknown key'); |
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} |
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/** |
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* @return bool |
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* @throws \RuntimeException |
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* @throws \SocialConnect\OpenIDConnect\Exception\UnsupportedSignatureAlgoritm |
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*/ |
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protected function verifySignature($data, array $keys) |
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{ |
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$supported = isset(self::$algorithms[$this->header->alg]); |
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if (!$supported) { |
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throw new UnsupportedSignatureAlgoritm($this->header->alg); |
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} |
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list ($function, $signatureAlg) = self::$algorithms[$this->header->alg]; |
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switch ($function) { |
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case 'openssl': |
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if (!function_exists('openssl_verify')) { |
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throw new \RuntimeException('Openssl-ext is required to use RSA encryption.'); |
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} |
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$jwk = $this->findKeyByKind($keys, $this->header->kid); |
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$result = openssl_verify( |
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$data, |
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$this->signature, |
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$jwk->getPublicKey(), |
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$signatureAlg |
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); |
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return $result == 1; |
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} |
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throw new UnsupportedSignatureAlgoritm($this->header->alg); |
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} |
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} |
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SocialConnect /
auth
Loading history...
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..