# Signals and Slots¶

FAL comes with a series of signals that offer the opportunity to hook into FAL processes at a variety of points.

They are listed below with some explanation, in particular when they are sent (if the name is not explicit enough) and what parameters the corresponding slot will receive. They are grouped by emitting class.

Most signals exist in pairs, one being sent before a given operation, the other one after.

Note

Unless mentioned otherwise, mentions of class “File” below actually refer to the \TYPO3\CMS\Core\Resource\FileInterface interface.

“Folder” objects actually refer to the \TYPO3\CMS\Core\Resource\Folder class.

## \TYPO3\CMS\Core\Resource\ResourceStorage¶

All signals are identified by constants of the \TYPO3\CMS\Core\Resource\ResourceStorageInterface interface.

SIGNAL_SanitizeFileName
The sanitize file name operation aims at removing characters from file names which are not allowed by the underlying Driver. The slot receives the file name and the target folder.
Receives the target file name, the target folder (as a Folder instance) and the local file path.
Receives the File instance corresponding to the newly stored file and the target folder (as a Folder instance).
SIGNAL_PostFileCreate
Receives the identifier of the newly created file and the target folder (as a Folder instance).
SIGNAL_PreFileCopy
Receives a File instance for the file to be copied and the target folder (as a Folder instance).
SIGNAL_PostFileCopy
Receives a File instance for the file that was copied (i.e. the original file) and the target folder (as a Folder instance).
SIGNAL_PreFileMove
Receives a File instance for the file to be moved and the target folder (as a Folder instance).
SIGNAL_PostFileMove
Receives a File instance for the file that was moved, the target folder and the original folder the file was in (both as Folder instances).
SIGNAL_PreFileDelete
Receives a File instance for the file to be deleted.
SIGNAL_PostFileDelete
Receives a File instance for the file that was deleted.
SIGNAL_PreFileRename
Receives a File instance for the file to be renamed and the sanitized new name.
SIGNAL_PostFileRename
Receives a File instance for the file that was renamed and the sanitized new name.
SIGNAL_PreFileReplace
Receives a File instance for the file to be replaced and the path to the local file that will replace it.
SIGNAL_PostFileReplace
Receives a File instance for the file that was replaced and the path to the local file that has replaced it.
SIGNAL_PostFileSetContents
Receives a \TYPO3\CMS\Core\Resource\AbstractFile instance for the file whose content was changed and the content itself (as a string).
Receives the name of the new folder and a reference to the parent folder, if any (as a Folder instance).
Receives the newly created folder (as a Folder instance).
SIGNAL_PreFolderCopy
Receives references to the folder to copy and the parent target folder (both as \TYPO3\CMS\Core\Resource\FolderInterface instances) and the sanitized name for the copy.
SIGNAL_PostFolderCopy
Receives references to the original folder and the parent target folder (both as \TYPO3\CMS\Core\Resource\FolderInterface instances) and the identifier of the newly copied folder.
SIGNAL_PreFolderMove
Receives references to the folder to move and the parent target folder (both as Folder instances) and the sanitized target name.
SIGNAL_PostFolderMove
Receives references to the folder to move and the parent target folder (both as Folder instances), the identifier of the moved folder and a reference to the original parent folder (as a Folder instance).
SIGNAL_PreFolderDelete
Receives a reference to the folder to delete (as a Folder instance).
SIGNAL_PostFolderDelete
Receives a reference to the deleted folder (as a Folder instance).
SIGNAL_PreFolderRename
Receives a reference to the folder to be renamed (as a Folder instance) and the sanitized new name.
SIGNAL_PostFolderRename
Receives a reference to the renamed folder (as a Folder instance) and the new identifier of the renamed folder.
SIGNAL_PreGeneratePublicUrl

This signal makes it possible to influence the construction of a resource’s public URL. If the slot defines the URL, it is kept as is and the rest of the URL generation process is ignored.

It receives a reference to the instance for which the URL should be generated (as a \TYPO3\CMS\Core\Resource\ResourceInterface instance), a boolean flag indicating whether the URL should be relative to the current script or absolute and a reference to the public URL (which is null at this point, but can be then modified by the slot).

## \TYPO3\CMS\Core\Resource\ResourceFactory¶

The signal is identified by a constant of the \TYPO3\CMS\Core\Resource\ResourceFactoryInterface interface.

SIGNAL_PostProcessStorage
This signal is emitted by method \TYPO3\CMS\Core\Resource\ResourceFactory::getStorageObject() after a Storage object has been fetched. The slot receives a reference to the Storage.

## \TYPO3\CMS\Core\Resource\Index\FileIndexRepository¶

recordCreated
Receives an array containing the information collected about the file whose index (i.e. “sys_file” table entry) was just created.
recordUpdated
Receives an array containing the information collected about the file whose index (i.e. “sys_file” table entry) was just updated.
recordDeleted
Receives the uid of the file (i.e. “sys_file” table entry) which was deleted.
recordMarkedAsMissing
Receives the uid of the file (i.e. “sys_file” table entry) which was marked as missing.

recordPostRetrieval
This signal is emitted after metadata has been retrieved for a given file. The slot receives the metadata as an \ArrayObject instance.
recordCreated
recordUpdated
This signal is emitted after metadata for a given file has been updated. The slot receives the metadata as an array containing all metadata fields (and not just the updated ones).
recordDeleted
Receives the uid of the file whose metadata has just been deleted.

## \TYPO3\CMS\Core\Resource\Service\FileProcessingService¶

All signals are identified by constants of the \TYPO3\CMS\Core\Resource\Service\FileProcessingService class.

SIGNAL_PreFileProcess
This signal is emitted before a file is processed. The slot receives a reference to the processed file and to the original file (both as File instances), a string defining the type of task being executed and an array containing the configuration for that task.
SIGNAL_PostFileProcess
This signal is emitted after a file has been processed. The slot receives a reference to the processed file and to the original file (both as File instances), a string defining the type of task being executed and an array containing the configuration for that task.