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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** @license For full copyright and license information, please see the LICENSE.md file. */ |
| 6 | |
| 7 | namespace App\Core\Security\Csp; |
| 8 | |
| 9 | defined('AMMONLY_APP') || exit('Direct script access is forbidden.'); |
| 10 | |
| 11 | use Twig\Extension\AbstractExtension; |
| 12 | use Twig\TwigFunction; |
| 13 | |
| 14 | /** |
| 15 | * Twig Extension for Content Security Policy (CSP) Level 3 Helpers. |
| 16 | * |
| 17 | * Exposes dynamic `csp_nonce()` function to Twig templates. |
| 18 | * |
| 19 | * @package App\Core\Security\Csp |
| 20 | */ |
| 21 | final class TwigCspExtension extends AbstractExtension |
| 22 | { |
| 23 | /** |
| 24 | * TwigCspExtension constructor. |
| 25 | * |
| 26 | * @param CspNonceManagerInterface $nonceManager Nonce manager instance. |
| 27 | */ |
| 28 | public function __construct( |
| 29 | private readonly CspNonceManagerInterface $nonceManager |
| 30 | ) { |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * {@inheritdoc} |
| 35 | */ |
| 36 | public function getFunctions(): array |
| 37 | { |
| 38 | return [ |
| 39 | new TwigFunction('csp_nonce', [$this, 'getNonce']), |
| 40 | new TwigFunction('csp_script_attr', [$this, 'renderNonceAttr'], ['is_safe' => ['html']]), |
| 41 | ]; |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Returns current request CSP nonce string. |
| 46 | * |
| 47 | * @return string Active nonce. |
| 48 | */ |
| 49 | public function getNonce(): string |
| 50 | { |
| 51 | return $this->nonceManager->getNonce(); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Renders safe nonce attribute string for inline script tags: `nonce="..."`. |
| 56 | * |
| 57 | * @return string Safe HTML attribute. |
| 58 | */ |
| 59 | public function renderNonceAttr(): string |
| 60 | { |
| 61 | $nonce = htmlspecialchars($this->getNonce(), ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8'); |
| 62 | return sprintf('nonce="%s"', $nonce); |
| 63 | } |
| 64 | } |