Feature: #102855 - PSR-14 event for modifying resolved link result data 

Description 

A new PSR-14 event \TYPO3\CMS\Core\LinkHandling\Event\AfterLinkResolvedByStringRepresentationEvent has been introduced which serves as a more powerful replacement for the now removed hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['Link']['resolveByStringRepresentation'] .

The event is being dispatched after LinkService has tried to resolve a given $urn using defined link handlers. This means, the new event is always dispatched, even if a handler successfully resolved the $urn and also even in cases, TYPO3 would have thrown the UnknownLinkHandlerException exception.

Therefore, the new event can not only be used to resolve custom link types but also to modify the link result data of existing link handlers and can additionally also be used to resolve situations where no handler could be found for a t3:// URN.

The event features the following methods:

• getResult() - Returns the resolved link result data
• setResult() - Allows to modify the final link result data
• getUrn() - Returns the link parameter (URN) to be resolved
• getResolveException() - Returns the exception, which will be thrown in case no link type has been resolved

Example 

The event listener class, using the PHP attribute #[AsEventListener] for registration:

use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Core\LinkHandling\Event\AfterLinkResolvedByStringRepresentationEvent;

final class AfterLinkResolvedByStringRepresentationEventListener
{
    #[AsEventListener]
    public function __invoke(AfterLinkResolvedByStringRepresentationEvent $event): void
    {
        if (str_contains($event->getUrn(), 'myhandler://123')) {
            $event->setResult([
                'type' => 'my-type',
            ]);
        }
    }
}

Impact 

Using the new PSR-14 event, it's now possible to fully modify the resolved link result data from LinkService->resolveByStringRepresentation() , just before the result is being returned. Therefore, even the resolved data of existing handlers can be manipulated.