recover files between hook, tpl and front controller - php

Question

I create a hook allowing the user to send a csv file.
I want to get the data (the file) that the user sends via a form (present in views/templates/hook), to get it in controller/front/files.php, and insert it in my database, anyone have an idea?
my hook in mymodule.php
public function hookDisplayLeftColumnProduct($params)
{
$this->context->smarty->assign([
'files' => Tools::getValue('files')
]);
return $this->display(__FILE__, 'mymodule.tpl');
}
views/templates/hook/mymodule.tpl
<div id="mymodule_block_home">
<form method="POST">
<label for="files">Envoyer un fichier CSV</label>
<input type="file" name="files" id="files">
<button>Envoyer</button>
</form>
</div>
my front controller who's not good I guess
class MyModuleFilesFrontController extends ModuleFrontController
{
public function initContent()
{
parent::initContent();
$files = Tools::getValue('files');
$this->setTemplate('module:mymodule/views/templates/front/files.tpl');
}
}
Thank you for your help

Answer 1

It is not a PrestaShop-specific problem. You might want to read about uploading files in PHP there:
https://www.tutorialspoint.com/php/php_file_uploading.htm
A few hints:
check if there is something to upload, always
make sure to validate user input, always
One more thing. I see that you hook your module into the product page. You could have the logic of uploading a file directly in your hook. You don't need an extra controller for that.
You could do something like:
public function hookDisplayLeftColumnProduct($params)
{
if (Tools::isSubmit('yourSubmitButtonName') {
// here's the logic of uploading the file
}
// the rest of the code
}