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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\AppFramework\Middleware\Security;
use OC\Security\CSP\ContentSecurityPolicyManager;
use OC\Security\CSP\ContentSecurityPolicyNonceManager;
use OC\Security\CSRF\CsrfTokenManager;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\ContentSecurityPolicy;
use OCP\AppFramework\Http\EmptyContentSecurityPolicy;
use OCP\AppFramework\Http\Response;
use OCP\AppFramework\Middleware;
class CSPMiddleware extends Middleware {
/** @var ContentSecurityPolicyManager */
private $contentSecurityPolicyManager;
/** @var ContentSecurityPolicyNonceManager */
private $cspNonceManager;
/** @var CsrfTokenManager */
private $csrfTokenManager;
public function __construct(ContentSecurityPolicyManager $policyManager,
ContentSecurityPolicyNonceManager $cspNonceManager,
CsrfTokenManager $csrfTokenManager) {
$this->contentSecurityPolicyManager = $policyManager;
$this->cspNonceManager = $cspNonceManager;
$this->csrfTokenManager = $csrfTokenManager;
}
/**
* Performs the default CSP modifications that may be injected by other
* applications
*
* @param Controller $controller
* @param string $methodName
* @param Response $response
* @return Response
*/
public function afterController($controller, $methodName, Response $response): Response {
$policy = !is_null($response->getContentSecurityPolicy()) ? $response->getContentSecurityPolicy() : new ContentSecurityPolicy();
if (get_class($policy) === EmptyContentSecurityPolicy::class) {
return $response;
}
$defaultPolicy = $this->contentSecurityPolicyManager->getDefaultPolicy();
$defaultPolicy = $this->contentSecurityPolicyManager->mergePolicies($defaultPolicy, $policy);
if ($this->cspNonceManager->browserSupportsCspV3()) {
$defaultPolicy->useJsNonce($this->csrfTokenManager->getToken()->getEncryptedValue());
}
$response->setContentSecurityPolicy($defaultPolicy);
return $response;
}
}
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