Backend\Modules\Profiles\Actions\Import::validateForm PHP Method

    private function validateForm()
    {
        if ($this->frm->isSubmitted()) {
            $this->frm->cleanupFields();
            // get fields
            $ddmGroup = $this->frm->getField('group');
            $fileFile = $this->frm->getField('file');
            $csv = array();
            // validate input
            $ddmGroup->isFilled(BL::getError('FieldIsRequired'));
            if ($fileFile->isFilled(BL::err('FieldIsRequired'))) {
                if ($fileFile->isAllowedExtension(array('csv'), sprintf(BL::getError('ExtensionNotAllowed'), 'csv'))) {
                    $csv = Csv::fileToArray($fileFile->getTempFileName());
                    if ($csv === false) {
                        $fileFile->addError(BL::getError('InvalidCSV'));
                    }
                }
            }
            if ($this->frm->isCorrect()) {
                // import the profiles
                $overwrite = $this->frm->getField('overwrite_existing')->isChecked();
                $statistics = BackendProfilesModel::importCsv($csv, $ddmGroup->getValue(), $overwrite);
                // trigger event
                BackendModel::triggerEvent($this->getModule(), 'after_import', array('statistics' => $statistics));
                // build redirect url with the right message
                $redirectUrl = BackendModel::createURLForAction('index') . '&report=';
                $redirectUrl .= $overwrite ? 'profiles-imported-and-updated' : 'profiles-imported';
                $redirectUrl .= '&var[]=' . $statistics['count']['inserted'];
                $redirectUrl .= '&var[]=' . $statistics['count']['exists'];
                // everything is saved, so redirect to the overview
                $this->redirect($redirectUrl);
            }
        }
    }