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<?php |
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namespace GuilhermeTome; |
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/* |
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* |
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* class Jwt |
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* |
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* used to encode and decode jwt |
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* pass the secret in global var |
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* |
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*/ |
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class Jwt |
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{ |
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/** |
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* The secret to encode and decode the JWT |
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* |
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* @var string; |
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*/ |
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private static string $secret = JWT_SECRET; |
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/** |
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* JWT hash to use |
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* |
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* @var string |
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*/ |
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private static string $hash = JWT_HASH; |
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/** |
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* JWT alg to put in header |
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* |
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* @var string |
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*/ |
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private static string $alg = JWT_ALG; |
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/** |
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* Create a jwt token |
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* |
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* @param array $data |
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* @return string |
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*/ |
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public static function encode(array $data): string |
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{ |
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// Header json |
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$header = json_encode(["alg" => self::$alg, "typ" => "JWT"]); |
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// Payload json |
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$payload = json_encode($data); |
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// Convert then to base64 |
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$header = self::base64url_encode($header); |
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$payload = self::base64url_encode($payload); |
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// Creating and converting signature with key |
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$signature = hash_hmac(self::$hash, $header . "." . $payload, self::$secret, true); |
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$signature = self::base64url_encode($signature); |
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return $header . "." . $payload . "." . $signature; |
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} |
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/** |
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* Validate a jwt token |
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* |
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* @param string $token |
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* @return bool|array |
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*/ |
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public static function decode(string $token) |
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{ |
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if (!empty($token)) { |
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$split = explode('.', $token); |
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if (count($split) == 3) { |
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$signature = hash_hmac(self::$hash, $split[0] . "." . $split[1], self::$secret, true); |
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$bsig = self::base64url_encode($signature); |
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if ($bsig == $split[2]) { |
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return json_decode(self::base64url_decode($split[1])); |
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} |
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} |
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} |
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return false; |
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} |
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/** |
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* Private function to encode url base64 |
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* |
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* @param string $data |
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* @return string |
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*/ |
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private static function base64url_encode(string $data): string |
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{ |
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return rtrim(strtr(base64_encode($data), '+/', '-_'), '='); |
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} |
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/** |
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* Private function to decode url base64 |
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* |
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* @param string $data |
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* @return string |
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*/ |
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private static function base64url_decode(string $data): string |
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{ |
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return base64_decode(strtr($data, '-_', '+/') . str_repeat('=', 3 - (3 + strlen($data)) % 4)); |
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} |
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} |
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GuilhermeTome /
jwt
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