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<?php |
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namespace ByJG\Util; |
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use Firebase\JWT\JWT; |
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class JwtWrapper |
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{ |
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protected $serverName; |
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/** |
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* @var JwtKeyInterface |
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*/ |
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protected $jwtKey; |
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/** |
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* JwtWrapper constructor. |
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* @param string $serverName |
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* @param JwtKeyInterface $jwtKey |
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* @throws JwtWrapperException |
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*/ |
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public function __construct($serverName, $jwtKey) |
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{ |
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$this->serverName = $serverName; |
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$this->jwtKey = $jwtKey; |
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if (!($jwtKey instanceof JwtKeyInterface)) { |
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throw new JwtWrapperException('Constructor needs to receive a JwtKeyInterface'); |
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} |
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} |
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/** |
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* @param $data |
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* @param int $secondsExpire In Seconds |
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* @param int $secondsNotBefore In Seconds |
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* @return array |
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*/ |
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public function createJwtData($data, $secondsExpire = 60, $secondsNotBefore = 0) |
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{ |
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$tokenId = base64_encode(openssl_random_pseudo_bytes(32)); |
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$issuedAt = time(); |
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$notBefore = $issuedAt + $secondsNotBefore; //Adding 10 seconds |
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$expire = $notBefore + $secondsExpire; // Adding 60 seconds |
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$serverName = $this->serverName; // Retrieve the server name from config file |
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/* |
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* Create the token as an array |
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*/ |
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return [ |
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'iat' => $issuedAt, // Issued at: time when the token was generated |
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'jti' => $tokenId, // Json Token Id: an unique identifier for the token |
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'iss' => $serverName, // Issuer |
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'nbf' => $notBefore, // Not before |
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'exp' => $expire, // Expire |
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'data' => $data // Data related to the signer user |
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]; |
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} |
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public function generateToken($jwtData) |
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{ |
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/* |
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* Encode the array to a JWT string. |
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* Second parameter is the key to encode the token. |
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* |
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* The output string can be validated at http://jwt.io/ |
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*/ |
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$jwt = JWT::encode( |
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$jwtData, //Data to be encoded in the JWT |
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$this->jwtKey->getPrivateKey(), // The signing key |
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$this->jwtKey->getAlghoritm() |
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); |
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return $jwt; |
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} |
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/** |
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* Extract the key, which is coming from the config file. |
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* |
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* Best suggestion is the key to be a binary string and |
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* store it in encoded in a config file. |
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* |
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* Can be generated with base64_encode(openssl_random_pseudo_bytes(64)); |
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* |
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* keep it secure! You'll need the exact key to verify the |
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* token later. |
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* |
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* @param null $bearer |
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* @return object |
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* @throws JwtWrapperException |
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*/ |
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public function extractData($bearer = null) |
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{ |
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if (empty($bearer)) { |
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$bearer = $this->getAuthorizationBearer(); |
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} |
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$jwtData = JWT::decode( |
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$bearer, |
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$this->jwtKey->getPublicKey(), |
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[ |
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$this->jwtKey->getAlghoritm() |
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] |
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); |
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if (isset($jwtData->iss) && $jwtData->iss != $this->serverName) { |
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throw new JwtWrapperException("Issuer does not match"); |
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} |
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return $jwtData; |
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} |
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/** |
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* @return mixed |
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* @throws JwtWrapperException |
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*/ |
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public function getAuthorizationBearer() |
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{ |
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$authorization = isset($_SERVER['HTTP_AUTHORIZATION']) ? $_SERVER['HTTP_AUTHORIZATION'] : ""; |
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list($bearer) = sscanf($authorization, 'Bearer %s'); |
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if (empty($bearer)) { |
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throw new JwtWrapperException('Absent authorization token'); |
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} |
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return $bearer; |
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} |
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public static function generateSecret($bytes) |
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{ |
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return base64_encode(openssl_random_pseudo_bytes($bytes)); |
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} |
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} |
byjg /
jwt-wrapper
