Delete file when deleting sys_file_reference

Question

I am writing an extension which allows to upload files in the frontend and backend of a TYPO3 instance. The upload works in both views but if the admin wants to delete an upload in the backend in list view, the "physical" file, which is located on the harddisk of the webserver, will not be deleted, only the sys_file_reference record.

Is there a possibility to tell the tca that in case of a deletion of the upload record the associated file should also be deleted? I've also tried to implement a slot with the following code but nothing happens:

ext_localconf.php:

\TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\SignalSlot\\Dispatcher')->connect(
    'TYPO3\CMS\Extbase\Persistence\Generic\Backend',
    'afterRemoveObject',
    'Kmi\feupload\Slots\MyAfterRemoveObjectSlot',
    'myAfterRemoveObjectMethod'
);

Classes/Slots/MyAfterRemoveObjectSlot.php:

namespace Kmi\feupload\Slots;
class MyAfterRemoveObjectSlot {
    public function myAfterRemoveObjectMethod($object) {
    // do something
    \TYPO3\CMS\Extbase\Utility\DebuggerUtility::var_dump($object);
    }
}

Has anyone an idea how to solve this? There will be many uploads and if the admin deletes one, the associated file should also be deleted...

Thank you in advance for your help :)

Answer 1

Unfortunately I don't have time to create a complete, tested answer ATM but I'm putting together the steps needed and hope that you can work a solution and complete my answer then.

Every manipulation done through a TCEFORM is saved with the DataHandler (formerly called TCEmain). The DataHandler has numerous hooks. I assume that your model "Upload" has a property file which is of type (or extends) \TYPO3\CMS\Extbase\Domain\Model\FileReference.

File references in TCEFORM are added as IRRE elements. So when you remove the file reference and save the Upload object, the following data is (amogst others) sent to DataHandler:

cmd[sys_file_reference][15011][delete]=1

This means that the file reference with uid 15011 must be deleted. I suggest to implement the processCmdmap_deleteAction hook for this.

So you must also check the datamap to find out if the command was executed through a manipulation of an "Upload" record.

ext_localconf.php:

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processCmdmapClass']['your_extension'] = 'My\\Extension\\Hook\\DataHandler';

EXT:your_extension/Classes/Hook/DataHandler.php

This code is untested!

<?php
namespace My\Extension\Hook

class DataHandler {

    /**
     * @param string $table
     * @param int $id
     * @param array $recordToDelete
     * @param $parentObject \TYPO3\CMS\Core\DataHandling\DataHandler
     */
    public function processCmdmap_deleteAction($table, $id, $recordToDelete, $parentObject) {
        if (array_key_exists('tx_myext_domain_model_upload', $parentObject->datamap)) {
            // Parent record of record to delete is of type "tx_myext_domain_model_upload"
            if ($table === 'sys_file_reference' && is_integer($id)) {
                // A file reference was requested to delete
                // Get an instance of the ResourceFactory
                /** @var $resourceFactory \TYPO3\CMS\Core\Resource\ResourceFactory */
                $resourceFactory = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Resource\\ResourceFactory');
                // We get the FileReference object for the given id
                $fileReferenceObject = $resourceFactory->getFileReferenceObject($id);
                // Delete the original file of the file reference
                $fileWasDeleted = $fileReferenceObject->getOriginalFile()->delete();
                // @TODO throw a warning if $fileWasDeleted is false                
            }
        }
    }

}

I commented the code so you know which checks are necessary for what.

Don't forget to clear the system cache after defining the hook in ext_localconf.php.