Important: #79647 - Added Hook for resolving custom link types

Description

A newly introduced hook in LinkService->resolveByStringRepresentation allows to resolve custom link types with special syntax. A reference to the empty $result array is passed as well as the $urn string that could not be resolved by the core.

Example

An example implementation for custom links that use myLinkIdentifier: as a prefix could look like this:

EXT:my_site/ext_localconf.php

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['Link']['resolveByStringRepresentation'][] =
   \MyVendor\MySite\Hooks\LinkServiceHook::class . '->resolveByStringRepresentation';

EXT:my_site/Classes/Hooks/LinkServiceHook.php

namespace MyVendor\MySite\Hooks;

class LinkServiceHook
{
   public function resolveByStringRepresentation(array $parameters): void
   {
      // Only care for links that start with myLinkIdentifier:
      if (stripos($parameters['urn'], 'myLinkIdentifier:') !== 0) {
         return;
      }

      // Be aware: substr of 17 because of the identifier and the colon
      $parameters['result'] = ['myLinkIdentifier' => substr($parameters['urn'], 17)];
      $parameters['result']['type'] = 'myLinkIdentifier';
   }
}