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Informations about the package fal-filewriter
FAL Filewriter 
Little helper package for when you want to create files and save them to TYPO3's File Abstraction Layer
Installation
FAL Filewriter is no TYPO3 extension and not available via TER. It can only be installed via composer:
composer require smichaelsen/fal-filewriter
Usage
FileGenerator
You need to create a class that provides the content that will be saved in a file. It has to implement the
\Smichaelsen\FalFilewriter\FileGeneratorInterface, which is fairly easy.
Storage
By default your TYPO3 installation will have a storage record with uid 1 pointing to the fileadmin, but of course you
can configure your own storage records pointing to other folders or even to external services like AWS.
Load the storage object like this:
$storage = $this->objectManager->get(\TYPO3\CMS\Core\Resource\StorageRepository::class)->findByUid($fileStorageUid);FileWriterService
The \Smichaelsen\FalFilewriter\FileWriterService has one public method saveFile() which takes the following parameters:
- $fileGenerator: Your file generator object implementing the
FileGeneratorInterface. - $fileIdentifier: The file name which may include a relative path inside the
$storagefolder. The file extension may be omitted. Then it is read from the$fileGenerator(->getFileExtension()). If the file name starts with a path that doesn't exist it will be tried to create that path. - $storage: The
ResourceStorageobject to save the file in. See above ("Storage") for more information.
As return value you will receive a \TYPO3\CMS\Core\Resource\FileInterface object for the saved file.
Example:
/** @var \Smichaelsen\FalFilewriter\FileWriterService $fileWriterService */
/** @var \Smichaelsen\FalFilewriter\FileGeneratorInterface $fileGenerator */
/** @var \TYPO3\CMS\Core\Resource\ResourceStorage $storage */
$fileObject = $fileWriterService->saveFile($fileGenerator, 'folder/my-filename', $storage);