<?php

/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Symfony\Component\Mime\Crypto;

use Symfony\Component\Mime\Exception\RuntimeException;
use Symfony\Component\Mime\Message;

/**
* @author Sebastiaan Stok <s.stok@rollerscapes.net>
*/
final class SMimeSigner extends SMime
{
private $signCertificate;
private $signPrivateKey;
private $signOptions;
private $extraCerts;

/**
* @param string $certificate The path of the file containing the signing certificate (in PEM format)
* @param string $privateKey The path of the file containing the private key (in PEM format)
* @param string|null $privateKeyPassphrase A passphrase of the private key (if any)
* @param string|null $extraCerts The path of the file containing intermediate certificates (in PEM format) needed by the signing certificate
* @param int|null $signOptions Bitwise operator options for openssl_pkcs7_sign() (@see https://secure.php.net/manual/en/openssl.pkcs7.flags.php)
*/
public function __construct(string $certificate, string $privateKey, ?string $privateKeyPassphrase = null, ?string $extraCerts = null, ?int $signOptions = null)
{
if (!\extension_loaded('openssl')) {
throw new \LogicException('PHP extension "openssl" is required to use SMime.');
}

$this->signCertificate = $this->normalizeFilePath($certificate);

if (null !== $privateKeyPassphrase) {
$this->signPrivateKey = [$this->normalizeFilePath($privateKey), $privateKeyPassphrase];
} else {
$this->signPrivateKey = $this->normalizeFilePath($privateKey);
}

$this->signOptions = $signOptions ?? \PKCS7_DETACHED;
$this->extraCerts = $extraCerts ? realpath($extraCerts) : null;
}

public function sign(Message $message): Message
{
$bufferFile = tmpfile();
$outputFile = tmpfile();

$this->iteratorToFile($message->getBody()->toIterable(), $bufferFile);

if (!@openssl_pkcs7_sign(stream_get_meta_data($bufferFile)['uri'], stream_get_meta_data($outputFile)['uri'], $this->signCertificate, $this->signPrivateKey, [], $this->signOptions, $this->extraCerts)) {
throw new RuntimeException(sprintf('Failed to sign S/Mime message. Error: "%s".', openssl_error_string()));
}

return new Message($message->getHeaders(), $this->convertMessageToSMimePart($outputFile, 'multipart', 'signed'));
}
}