/**
* Extracts the files from a request.
*
* @param FacebookRequest $request
*
* @return string|null
*
* @throws FacebookSDKException
*/
public function extractFileAttachments(FacebookRequest $request)
{
if (!$request->containsFileUploads()) {
return null;
}
$files = $request->getFiles();
$fileNames = [];
foreach ($files as $file) {
$fileName = uniqid();
$this->addFile($fileName, $file);
$fileNames[] = $fileName;
}
$request->resetFiles();
// @TODO Does Graph support multiple uploads on one endpoint?
return implode(',', $fileNames);
}