Feature: #84244 - Allow adding additional query restrictions

See Issue #84244

Description

It is now possible to add additional query restrictions by adding class names as key to $GLOBALS['TYPO3_CONF_VARS']['DB']['additionalQueryRestrictions'] These restriction objects will be added to any select query executed using the QueryBuilder.

If these added restriction objects additionally implement \TYPO3\CMS\Core\Database\Query\Restriction\EnforceableQueryRestrictionInterface and return true in the to be implemented method isEnforced(), calling $queryBuilder->getRestrictions()->removeAll() such restrictions will still be applied to the query.

If an enforced restriction must be removed, it can still be removed with $queryBuilder->->getRestrictions()->removeByType(SomeClass::class);

Implementers of custom restrictions can therefore have their restrictions always enforced, or even not applied at all, by returning an empty expression in certain cases.

To add a custom restriction class, use the following snippet in a ext_localconf.php file of your extension:

if (!isset($GLOBALS['TYPO3_CONF_VARS']['DB']['additionalQueryRestrictions'][\Vendor\ExtName\Database\Query\Restriction\CustomRestriction::class])) {
    $GLOBALS['TYPO3_CONF_VARS']['DB']['additionalQueryRestrictions'][\Vendor\ExtName\Database\Query\Restriction\CustomRestriction::class] = [];
}

Please note, that the class name must be the array key and the value must always be an array, which is reserved for options given to the restriction objects.

Impact

Restrictions added by third party extensions will impact the whole system. Therefore this API does not allow removing restrictions added by the system and adding restrictions should be handled with care.

Removing third party restrictions is possible, by setting the option value disabled for a restriction to true in global TYPO3 configuration or ext_localconf.php of an extension, like shown below.

$GLOBALS['TYPO3_CONF_VARS']['DB']['additionalQueryRestrictions'][\Vendor\ExtName\Database\Query\Restriction\CustomRestriction::class]['disabled'] = true;