PolicyMutatedEvent
The PSR-14 event
\TYPO3\
will be dispatched once all mutations have been applied to the current
Content Security Policy object, just before the
corresponding HTTP header is added to the HTTP response object. This allows
individual adjustments for custom implementations.
Example
<?php
declare(strict_types=1);
namespace MyVendor\MyExtension\ContentSecurityPolicy\EventListener;
use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Core\Security\ContentSecurityPolicy\Directive;
use TYPO3\CMS\Core\Security\ContentSecurityPolicy\Event\PolicyMutatedEvent;
use TYPO3\CMS\Core\Security\ContentSecurityPolicy\UriValue;
#[AsEventListener(
identifier: 'my-extension/mutate-policy',
)]
final readonly class MyEventListener
{
public function __invoke(PolicyMutatedEvent $event): void
{
if ($event->scope->type->isFrontend()) {
// In our example, only the backend policy should be adjusted
return;
}
// Allow images from example.org
$event->getCurrentPolicy()->extend(
Directive::ImgSrc,
new UriValue('https://example.org/'),
);
}
}
New in version 13.0
The PHP attribute
\TYPO3\ has been
introduced to tag a PHP class as an event listener. Alternatively, or if you
need to be compatible with older TYPO3 versions, you can also register an
event listener via the Configuration/Services.yaml file. Switch to
an older version of this page for an example or have a look at the section
Implementing an event listener in your extension.