Pagekit\Installer\Controller\PackageController::uploadAction PHP Method

    public function uploadAction($type)
    {
        $file = App::request()->files->get('file');
        if ($file === null || !$file->isValid()) {
            App::abort(400, __('No file uploaded.'));
        }
        $package = $this->loadPackage($file->getPathname());
        if (!$package->getName() || !$package->get('title') || !$package->get('version')) {
            App::abort(400, __('"composer.json" file not valid.'));
        }
        if ($package->get('type') !== 'pagekit-' . $type) {
            App::abort(400, __('No Pagekit %type%', ['%type%' => $type]));
        }
        $filename = str_replace('/', '-', $package->getName()) . '-' . $package->get('version') . '.zip';
        $file->move(App::get('path') . '/tmp/packages', $filename);
        return compact('package');
    }