public function upload(Request $request) {
        $result = [];

        $fileToUpload = $request->file('upload');

        switch ($fileToUpload->getMimeType()) {
            case 'image/gif':
                $extension = "gif";
                break;
            case 'image/png':
                $extension = "png";
                break;
            case 'image/jpg':
            case 'image/jpeg':
                $extension = "jpg";
                break;
            default:
                $extension = "no extension";
                $result['files'][] = ['error' => 'El fichero debe ser una imagen', 'name' => $_FILES['upload']['name']];

                return "El fichero debe ser una imagen";
                break;
        }

        $fileParts = pathinfo($fileToUpload->getClientOriginalName());
        $filename = $fileParts['filename'];

        $path = Config::get('upload.path') . 'images' . '/';
        $url  = Config::get('app.url') . Config::get('upload.url') . 'images' . '/';
        $name = $filename . '.' . $extension;

        $i = 1;
        while (\File::exists($path . $name)) {
            $name = $filename . '_' . $i . ' . ' . $extension;
            $i++;
        }

        $fileUrl = $url . $name;
        $fileToUpload->move($path,$name);
        //move_uploaded_file($_FILES['upload']['tmp_name'], $file);
        // Required: anonymous function reference number as explained above.
        $funcNum = $_GET['CKEditorFuncNum'];
        // Optional: instance name (might be used to load a specific configuration file or anything else).
        $CKEditor = $_GET['CKEditor'];
        // Optional: might be used to provide localized messages.
        $langCode = $_GET['langCode'];

        // Check the $_FILES array and save the file. Assign the correct path to a variable ($url).
        // Usually you will only assign something here if the file could not be uploaded.
        $message = "";

        echo "<script type='text/javascript'>window.parent.CKEDITOR.tools.callFunction($funcNum, '$fileUrl', '$message');</script>";
    }