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| PdfValidator | |
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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors |
| 7 | * SPDX-License-Identifier: AGPL-3.0-or-later |
| 8 | */ |
| 9 | |
| 10 | namespace OCA\Libresign\Service\File\Pdf; |
| 11 | |
| 12 | use OCA\Libresign\Exception\LibresignException; |
| 13 | use OCA\Libresign\Handler\DocMdpHandler; |
| 14 | use OCP\IL10N; |
| 15 | |
| 16 | class PdfValidator { |
| 17 | /** |
| 18 | * Semantic error code for a document whose DocMDP certification disallows additional signatures. |
| 19 | */ |
| 20 | public const int CODE_DOCMDP_RESTRICTED = 4221; |
| 21 | |
| 22 | public function __construct( |
| 23 | private PdfParser $pdfParser, |
| 24 | private DocMdpHandler $docMdpHandler, |
| 25 | private IL10N $l10n, |
| 26 | ) { |
| 27 | } |
| 28 | |
| 29 | /** |
| 30 | * Validate PDF content and DocMDP restrictions. |
| 31 | * |
| 32 | * @param string $content The PDF content to validate |
| 33 | * @param string $fileName File name for error messages |
| 34 | * @throws LibresignException |
| 35 | */ |
| 36 | public function validate(string $content, string $fileName): void { |
| 37 | $this->pdfParser->parse($content, $fileName); |
| 38 | $this->validateDocMdpRestrictions($content, $fileName); |
| 39 | } |
| 40 | |
| 41 | private function validateDocMdpRestrictions(string $content, string $fileName): void { |
| 42 | $resource = fopen('php://memory', 'r+'); |
| 43 | if (!is_resource($resource)) { |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | try { |
| 48 | fwrite($resource, $content); |
| 49 | rewind($resource); |
| 50 | |
| 51 | if (!$this->docMdpHandler->allowsAdditionalSignatures($resource)) { |
| 52 | // TRANSLATORS %s is the file name of the PDF with DocMDP restrictions |
| 53 | throw new LibresignException($this->l10n->t('This document has been certified with no changes allowed, so no additional signatures can be added: %s', [$fileName]), self::CODE_DOCMDP_RESTRICTED); |
| 54 | } |
| 55 | } finally { |
| 56 | fclose($resource); |
| 57 | } |
| 58 | } |
| 59 | } |