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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Security\CSP;
use OCP\AppFramework\Http\ContentSecurityPolicy;
use OCP\AppFramework\Http\EmptyContentSecurityPolicy;
use OCP\EventDispatcher\IEventDispatcher;
use OCP\Security\CSP\AddContentSecurityPolicyEvent;
use OCP\Security\IContentSecurityPolicyManager;
class ContentSecurityPolicyManager implements IContentSecurityPolicyManager {
/** @var ContentSecurityPolicy[] */
private array $policies = [];
public function __construct(
private IEventDispatcher $dispatcher,
) {
}
/** {@inheritdoc} */
public function addDefaultPolicy(EmptyContentSecurityPolicy $policy): void {
$this->policies[] = $policy;
}
/**
* Get the configured default policy. This is not in the public namespace
* as it is only supposed to be used by core itself.
*/
public function getDefaultPolicy(): ContentSecurityPolicy {
$event = new AddContentSecurityPolicyEvent($this);
$this->dispatcher->dispatchTyped($event);
$defaultPolicy = new \OC\Security\CSP\ContentSecurityPolicy();
foreach ($this->policies as $policy) {
$defaultPolicy = $this->mergePolicies($defaultPolicy, $policy);
}
return $defaultPolicy;
}
/**
* Merges the first given policy with the second one
*/
public function mergePolicies(
ContentSecurityPolicy $defaultPolicy,
EmptyContentSecurityPolicy $originalPolicy,
): ContentSecurityPolicy {
foreach ((object)(array)$originalPolicy as $name => $value) {
$setter = 'set' . ucfirst($name);
if (\is_array($value)) {
$getter = 'get' . ucfirst($name);
$currentValues = \is_array($defaultPolicy->$getter()) ? $defaultPolicy->$getter() : [];
$defaultPolicy->$setter(array_values(array_unique(array_merge($currentValues, $value))));
} elseif (\is_bool($value)) {
$getter = 'is' . ucfirst($name);
$currentValue = $defaultPolicy->$getter();
// true wins over false
if ($value > $currentValue) {
$defaultPolicy->$setter($value);
}
}
}
return $defaultPolicy;
}
}
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