编辑文件 - Jwt.php

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路径: /srv/systems_dir/koruspay/library/Core/Jwt.php
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<?php

class Core_Jwt
{
   
    /**
     * @todo precisa concluir
     */
    public function authorize(string $token, string $secret): array
    {
        $token          = explode('.', $token);
        $header         = $this->base64urlDecode($token[0]);
        $payload        = $this->base64urlDecode($token[1]);
        $signature      = $this->base64urlDecode($token[2]);
        $headerPayload = $token[0] . '.' . $token[1];
 
        if (hash_hmac('sha256', $headerPayload, $secret, true) !== $signature) {
            throw new \Exception('Invalid signature');
        }
        return json_decode($payload, true);
    }

/**
     * @todo precisa concluir junto com o authorize
     */
    public function generateToken($clientId, $clientSecret)
    {
        // RFC-defined structure
        $header = [
            "alg" => "HS256",
            "typ" => "JWT"
        ];

// whatever you want
        $payload = [
            "token" => $clientId,
            "stamp" => date("c")
        ];

$jwt = sprintf(
            "%s.%s",
            $this->base64urlEncode(json_encode($header)),
            $this->base64urlEncode(json_encode($payload))
        );

return sprintf(
            "%s.%s",
            $jwt,
            $this->base64urlEncode(hash_hmac('SHA256', $jwt, base64_decode($clientSecret), true))
        );
    }

public function getClientId()
    {
        return base64_encode(random_bytes(12));
    }

public function getClientSecret()
    {
        return base64_encode(random_bytes(24));
    }

protected function base64urlEncode($data) 
    {
        $b64 = base64_encode($data);

if ($b64 === false) {
          return false;
        }

$url = strtr($b64, '+/', '-_');
        return rtrim($url, '=');
    }

protected function base64urlDecode($string) 
    {
        return base64_decode(str_replace(['-','_'], ['+','/'], $string));
    }

public static function generateApiKey(?int $bytesNumber = 12)
    {
        $hex = random_bytes($bytesNumber);
        $hex = bin2hex($hex);
        $hex = strtoupper($hex);
        return wordwrap($hex , 4, '-' , true);
    }
}

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