ContentSecurityPolicies.php

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<?php
 
declare(strict_types=1);
 
use ‪TYPO3\CMS\Core\Security\ContentSecurityPolicy\Directive;
use ‪TYPO3\CMS\Core\Security\ContentSecurityPolicy\Mutation;
use ‪TYPO3\CMS\Core\Security\ContentSecurityPolicy\MutationCollection;
use ‪TYPO3\CMS\Core\Security\ContentSecurityPolicy\MutationMode;
use ‪TYPO3\CMS\Core\Security\ContentSecurityPolicy\Scope;
use ‪TYPO3\CMS\Core\Security\ContentSecurityPolicy\UriValue;
use ‪TYPO3\CMS\Core\Type\Map;
 
return Map::fromEntries([
    Scope::backend(),
    new ‪MutationCollection(
        new ‪Mutation(
            MutationMode::Extend,
            Directive::ImgSrc,
            new ‪UriValue('https://extensions.typo3.org'),
        ),
    ),
]);