Breaking: #96935 - Register linkvalidator linktypes via service configuration 

See forge#96935

Description 

Linkvalidator linktypes are now registered via service configuration, also see feature changelog. Therefore the registration via $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['linkvalidator']['checkLinks'] has been removed.

Additionally, to be able to use autoconfiguration, the linktype identifier has to be provided by the service directly using the getIdentifier() method, which is now required by the LinktypeInterface.

In case a custom linktype extends \TYPO3\CMS\Linkvalidator\Linktype\AbstractLinktype , only the class property $identifier has to be set, e.g. protected string $identifier = 'my_linktype';.

Impact 

Registration of custom linktypes via $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['linkvalidator']['checkLinks'] is not evaluated anymore.

The LinktypeInterface is extended for public function getIdentifier(): string.

Affected Installations 

All TYPO3 installations using the old registration.

All TYPO3 installations with custom linktypes, not implementing public function getIdentifier(): string.

Migration 

Remove $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['linkvalidator']['checkLinks'] from your ext_localconf.php file.

If autoconfigure is not enabled in your Configuration/Services.(yaml|php), add the tag linkvalidator.linktype manually to your linktype service.

Vendor\Extension\Linktype\MyCustomLinktype:
  tags:
    - name: linkvalidator.linktype
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Additionally, make sure to either implement public function getIdentifier(): string or, in case your linktype extends AbstractLinktype, to set the $identifier class property.