I have prepared one module in which I have used Image upload button. And My button is working fine unless I am not entering any "Disallowed file type". When I enter any disallowed file type it gives me exception.

I have written the below function to upload file of my required file-type and to handle exception. I have also prepared required block and model file for image upload. I have followed this post

public function uploadFileAndGetName($input, $destinationFolder, $data)
    try {
        if (isset($data[$input]['delete'])) {
            return '';
        } else {
            $uploader = $this->uploaderFactory->create(['fileId' => $input]);
            $uploader->setAllowedExtensions(['jpg', 'jpeg', 'gif', 'png']);
            $result = $uploader->save($destinationFolder);
            return $result['file'];
    } catch (\Exception $e) {
        if ($e->getCode() != \Magento\Framework\File\Uploader::TMP_NAME_EMPTY) {
            throw new FrameworkException($e->getMessage());
        } else {
            if (isset($data[$input]['value'])) {
                return $data[$input]['value'];
    return '';

When I enter any disallowed file-type, it gives me blank page and gives error "Disallowed file type".

If anyone faced this issue, please help me.

1 Answer 1


In my case it was due to the Exception class in the throw block. I'm using magento 2.17, the Uploader class throws Exception class. Please check framework/file/Uploader.php:: _validateFile(). Makesure the Exception class in the Uploader throw block and your Exception reference in your code is identical. My case it is worked: framework/file/Uploader.php:

  protected function _validateFile()
    if ($this->_fileExists === false) {

    //is file extension allowed
    if (!$this->checkAllowedExtension($this->getFileExtension())) {

        throw new \Exception('Disallowed file type.');
    //run validate callbacks
    foreach ($this->_validateCallbacks as $params) {
        if (is_object($params['object'])
            && method_exists($params['object'], $params['method'])
            && is_callable([$params['object'], $params['method']])
        ) {

And in my code it was like:

try {
                $this->_fileUploaderFactory = $this->_objectManager->get('Magento\MediaStorage\Model\File\UploaderFactory');
                $uploader = $this->_fileUploaderFactory->create(['fileId' => 'banner']);

                $uploader->setAllowedExtensions(['jpg', 'jpeg','png']);

                $mediaDirectory = $this->_objectManager->get('Magento\Framework\Filesystem')
                $path           = $mediaDirectory->getAbsolutePath('bannerslider/images/');

                $result = $uploader->save($path);

                $data['banner'] = isset($result['file']) ? $result['file'] : null;
            } catch (\Exception $e) {

                $data['banner'] = $_FILES['banner']['name'];

                $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);

                // Your code

                return $resultRedirect;

  • Worked for me. Thanks. +1 Apr 26, 2019 at 6:35

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