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<?php |
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namespace IonGhitun\JwtToken; |
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use Carbon\Carbon; |
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use IonGhitun\JwtToken\Exceptions\JwtException; |
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/** |
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* Class Jwt |
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* |
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* @package IonGhitun\JwtToken |
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*/ |
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class Jwt |
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{ |
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/** |
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* Generate a new JWT token. |
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* |
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* @param array $payload |
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* |
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* @return string |
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*/ |
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public static function generateToken(array $payload) |
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{ |
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$header = self::base64EncodeUrlSafe(json_encode(['typ' => 'JWT', 'alg' => 'HS256'])); |
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if (!isset($payload['expiration'])) { |
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$payload['expiration'] = Carbon::now()->addDay()->format('Y-m-d H:i:s'); |
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} |
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$payload = self::base64EncodeUrlSafe(json_encode($payload)); |
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$signature = self::generateSignature($header, $payload); |
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return $header . "." . $payload . "." . $signature; |
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} |
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/** |
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* Url safe base 64 encode. |
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* |
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* @param string $string |
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* |
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* @return string|string[] |
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*/ |
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private static function base64EncodeUrlSafe(string $string) |
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{ |
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return str_replace('=', '', strtr(base64_encode($string), '+/', '-_')); |
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} |
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/** |
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* Generate signature |
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* |
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* @param $header |
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* @param $payload |
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* @param bool $encode |
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* |
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* @return string|string[] |
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*/ |
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private static function generateSignature($header, $payload, $encode = true) |
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{ |
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$signature = hash_hmac('sha256', $header . '.' . $payload, getenv('JWT_SECRET'), true); |
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if ($encode) { |
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return self::base64EncodeUrlSafe($signature); |
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} |
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return $signature; |
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} |
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/** |
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* Validate JWT token and return payload |
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* |
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* @param $token |
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* @return mixed |
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* |
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* @throws JwtException |
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*/ |
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public static function validateToken($token) |
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{ |
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$tokenData = explode('.', $token); |
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if (count($tokenData) !== 3) { |
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throw new JwtException('Not a valid JWT token!'); |
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} |
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list($header64, $payload64, $signature64) = $tokenData; |
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$payload = json_decode(self::base64DecodeUrlSafe($payload64), true); |
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if (!$payload || !isset($payload['expiration']) || Carbon::parse($payload['expiration']) < Carbon::now()) { |
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throw new JwtException('Jwt token expired!'); |
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} |
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$signature = self::base64DecodeUrlSafe($signature64); |
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if ($signature !== self::generateSignature($header64, $payload64, false)) { |
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throw new JwtException('Could not verify Jwt token signature!'); |
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} |
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return $payload; |
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} |
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/** |
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* Url safe base 64 decode. |
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* |
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* @param $string |
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* |
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* @return false|string |
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*/ |
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private static function base64DecodeUrlSafe($string) |
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{ |
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$mod = strlen($string) % 4; |
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if ($mod !== 0) { |
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$padlen = 4 - $mod; |
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$string .= str_repeat('=', $padlen); |
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} |
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return base64_decode(strtr($string, '-_', '+/')); |
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} |
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} |
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ionghitun /
jwt-token
