Symfony2 API - Best way to import and save a CSV file - php

Question

I need to create an API that receives via POST a .csv file that in a second moment has to be saved to the DB.
This is how I wrote the function:
/**
* #Route("/importCSV", name = "import_csv")
* #Method("POST")
**/
public function importCSVAction(Request $request) {
if ($this->getRequest()->files) {
$type = "csv";
$filename = date('Ymd').'-'.$type.'-filename';
$directory = $this->container->getParameter('kernel.root_dir') . '/../Documents';
$request = $this->get('request');
$data = $request->getContent();
try {
$fs = new Filesystem();
$fs->dumpFile($filename, $data);
move_uploaded_file($filename, $directory);
}
catch(IOException $e) {
return new Response ("File not saved!", 500, array('Content-Type' => 'application/json'));
}
return new Response($data);
}
else return new Response("Error!", 500, array('Content-Type' => 'application/json'));
}
1 One problem is that the file is saved under the web folder and not under Documents as I wanted.
Also, how can I check if the file I'm importing is a .csv file?
2 I searched on the web but I did not found many resources on this subject.
I just want to know if this is generally a correct way to save the .csv file.
Thanks!