Feature: #107568 - PSR-14 Event before renderable is validated

Description

A new PSR-14 event \TYPO3\CMS\Form\Event\BeforeRenderableIsValidatedEvent has been introduced which serves as an improved replacement for the now removed hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['afterSubmit'].

The new event is dispatched just right before a renderable is validated.

The event provides the following public properties:

$value: The submitted value of the renderable
$formRuntime: The form runtime object (readonly)
$renderable: The renderable (readonly)
$request: The current request (readonly)

Example

An example event listener could look like:

use TYPO3\CMS\Form\Event\BeforeRenderableIsValidatedEvent;

class MyEventListener {

    #[AsEventListener(
        identifier: 'my-extension/before-renderable-is-validated',
    )]
    public function __invoke(BeforeRenderableIsValidatedEvent $event): void
    {
        $renderable = $event->renderable;
        if ($renderable->getType() !== 'AdvancedPassword') {
            return;
        }

        $elementValue = $event->value;
        if ($elementValue['password'] !== $elementValue['confirmation']) {
            $processingRule = $renderable->getRootForm()->getProcessingRule($renderable->getIdentifier());
            $processingRule->getProcessingMessages()->addError(
                GeneralUtility::makeInstance(
                    Error::class,
                    GeneralUtility::makeInstance(TranslationService::class)->translate('validation.error.1556283177', null, 'EXT:form/Resources/Private/Language/locallang.xlf'),
                    1556283177
                )
            );
        }
        $event->value = $elementValue['password'];
    }
}

Impact

With the new PSR-14 BeforeRenderableIsValidatedEvent, it's now possible to prevent the deletion of a renderable and to add custom logic based on the deletion.