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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 | /** |
| 12 | * Standard In-Memory CSP Nonce Manager. |
| 13 | * |
| 14 | * Implements CspNonceManagerInterface producing cryptographically secure 128-bit |
| 15 | * base64-encoded nonces per request in accordance with OWASP ASVS v5 V14.4.3. |
| 16 | * |
| 17 | * @package App\Core\Security\Csp |
| 18 | */ |
| 19 | final class CspNonceManager implements CspNonceManagerInterface |
| 20 | { |
| 21 | private const int NONCE_BYTE_LENGTH = 16; |
| 22 | |
| 23 | private ?string $currentNonce = null; |
| 24 | |
| 25 | /** |
| 26 | * {@inheritdoc} |
| 27 | */ |
| 28 | public function getNonce(): string |
| 29 | { |
| 30 | if ($this->currentNonce === null || $this->currentNonce === '') { |
| 31 | $this->currentNonce = $this->generateNonce(); |
| 32 | } |
| 33 | |
| 34 | return $this->currentNonce; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * {@inheritdoc} |
| 39 | */ |
| 40 | public function regenerateNonce(): string |
| 41 | { |
| 42 | $this->currentNonce = $this->generateNonce(); |
| 43 | return $this->currentNonce; |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Generates a cryptographically strong 16-byte base64-encoded string. |
| 48 | */ |
| 49 | private function generateNonce(): string |
| 50 | { |
| 51 | return base64_encode(random_bytes(self::NONCE_BYTE_LENGTH)); |
| 52 | } |
| 53 | } |