Zend Framework 3: create download link for generated file - php

Question

I'm writing an app that lets the user upload an Excel file. It checks the file for errors, then, if no errors are found, it uploads the contents to a database. If it does find errors, the cells containing errors are colored red, then the file is saved. I then want to create a download link to this file so the user can check where they made mistakes.
The problem is that I am not sure how to create this link and where to store the file. I modify the file like this:
foreach ($badCells as $bcell) {
$sheet->getStyle($bcell)->applyFromArray(array(
'fill' => array(
'type' => \PHPExcel_Style_Fill::FILL_SOLID,
'color' => array('rgb' => 'FF4444')
)
));
}
And then save it with
$objWriter->save($dldir . $formData['upload']['name']);
$dldir is created with
$dldir = "/download/";
if (file_exists($dldir)) {
if (!is_dir($dldir)) {
unlink($dldir);
mkdir($dldir);
}
} else {
if(!is_dir($dldir)) {
mkdir($dldir);
}
}
Is this even the right way to do this? Can I store the files in any old folder or do they have go somewhere specific? How do I create the link to the specific file in the view for the user and make it accessible so they can download it?

Answer 1

I may be wrong .
For file upload i use this library Gargron/fileupload
The function bellow help to upload file to a specific folder and return full link of the file. You can save the link in DB
function uploadFile ($file){
$validator = new \FileUpload\Validator\Simple('5M');
$pathresolver = new \FileUpload\PathResolver\Simple($_SERVER['DOCUMENT_ROOT'].'/upload_folder');
$filesystem = new \FileUpload\FileSystem\Simple();
$fileupload = new \FileUpload\FileUpload(file, $_SERVER);
$fileupload->setPathResolver($pathresolver);
$fileupload->setFileSystem($filesystem);
$fileupload->addValidator($validator);
$md5Generator = new \FileUpload\FileNameGenerator\MD5 (true);
$fileupload->setFileNameGenerator($md5Generator);
list($files) = $fileupload->processAll();
foreach($files as $file){
if ($file->completed) {
return $_SERVER['DOCUMENT_ROOT'].'/upload_folder/'.$file->getFileName()) ;
}
}
}

Answer 2

Thanks for the help, I managed to figure it out over the weekend. Here's how I did
it:
$filename = join(DIRECTORY_SEPARATOR, array($dldir, $formData['upload']['name']));
$objWriter->save(str_replace(__FILE__,$filename,__FILE__));
This is how I save the file, using DIRECTORY_SEPARATOR so it will work correctly on both Windows and Linux.
return $this->redirect()->toRoute('import', ['action' => 'reject'],['query' => ['q' => 'file', 'name' => $filename]]);
In the controller, I redirect the route to the correct action and pass the file name on to it via a query URL.
public function rejectAction()
{
$filename = $this->getRequest()->getQuery('name', null);
return new ViewModel(array('filename' => $filename));
}
There, I obtain said file name through getRequest()->getQuery() and pass it on to the viewmodel.
Right-click here and choose 'Save As' to download your file.
And finally, this is how it shows the link in reject.phtml.
Downloading only works with right click and save as, I suspect I will have to write some sort of file handler to make ZF produce the correct headers for a normal left click download.