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59 lines
1.3 KiB
PHP
59 lines
1.3 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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namespace OC\Security\CSP;
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use OC\AppFramework\Http\Request;
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use OC\Security\CSRF\CsrfTokenManager;
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use OCP\IRequest;
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/**
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* @package OC\Security\CSP
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*/
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class ContentSecurityPolicyNonceManager {
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private string $nonce = '';
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public function __construct(
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private CsrfTokenManager $csrfTokenManager,
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private IRequest $request,
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) {
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}
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/**
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* Returns the current CSP nonce
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*/
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public function getNonce(): string {
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if ($this->nonce === '') {
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if (empty($this->request->server['CSP_NONCE'])) {
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// Get the token from the CSRF token, we only use the "shared secret" part
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// as the first part does not add any security / entropy to the token
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// so it can be ignored to keep the nonce short while keeping the same randomness
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$this->nonce = end(explode(':', ($this->csrfTokenManager->getToken()->getEncryptedValue())));
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} else {
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$this->nonce = $this->request->server['CSP_NONCE'];
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}
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}
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return $this->nonce;
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}
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/**
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* Check if the browser supports CSP v3
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*/
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public function browserSupportsCspV3(): bool {
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$browserBlocklist = [
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Request::USER_AGENT_IE,
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];
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if ($this->request->isUserAgent($browserBlocklist)) {
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return false;
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}
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return true;
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}
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}
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