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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | /** |
| 5 | * SPDX-FileCopyrightText: 2020-2024 LibreCode coop and contributors |
| 6 | * SPDX-License-Identifier: AGPL-3.0-or-later |
| 7 | */ |
| 8 | |
| 9 | namespace OCA\Libresign\Service; |
| 10 | |
| 11 | use OCA\Libresign\Exception\LibresignException; |
| 12 | use OCA\Libresign\Handler\SignEngine\SignEngineFactory; |
| 13 | use Psr\Log\LoggerInterface; |
| 14 | |
| 15 | class PdfSignatureDetectionService { |
| 16 | public function __construct( |
| 17 | private SignEngineFactory $signEngineFactory, |
| 18 | private LoggerInterface $logger, |
| 19 | ) { |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * Check if a PDF has existing signatures |
| 24 | * |
| 25 | * @param string $pdfContent The PDF file content |
| 26 | * @return bool True if the file has signatures, false otherwise |
| 27 | */ |
| 28 | public function hasSignatures(string $pdfContent): bool { |
| 29 | $resource = fopen('php://memory', 'r+'); |
| 30 | if ($resource === false) { |
| 31 | $this->logger->warning('Failed to create resource for signature detection'); |
| 32 | return false; |
| 33 | } |
| 34 | |
| 35 | fwrite($resource, $pdfContent); |
| 36 | rewind($resource); |
| 37 | |
| 38 | try { |
| 39 | $engine = $this->signEngineFactory->resolve('pdf'); |
| 40 | $certificates = $engine->getCertificateChain($resource); |
| 41 | return !empty($certificates); |
| 42 | } catch (LibresignException) { |
| 43 | return false; |
| 44 | } catch (\Throwable $e) { |
| 45 | $this->logger->debug('Failed to detect signatures: ' . $e->getMessage()); |
| 46 | return false; |
| 47 | } finally { |
| 48 | fclose($resource); |
| 49 | } |
| 50 | } |
| 51 | } |