Laravel controller for uploading files requiring certain mimetypes

UploadController.php

<?php

class UploadController extends BaseController {

    public function upload() {
        // Getting POST data
        $file = array('image' => Input::file('image'));
        $rules = array('image' => 'required|mimes:jpeg,bmp,png',);

        // doing the validation, passing post data, rules and the messages
        $validator = Validator::make($file, $rules);
        if ($validator->fails()) {
            // send back to the page with the input data and errors
            return Redirect::to('upload')->withInput()->withErrors($validator);
        }
        else {
            // checking if file is valid.
            if (Input::file('image')->isValid()) {
                $destinationPath = public_path().'/storage/uploads'; // upload path
                $extension = Input::file('image')->getClientOriginalExtension(); // getting image extension
                $fileName = rand(11111,99999).'.'.$extension; // renaming image
                Input::file('image')->move($destinationPath, $fileName); // uploading file to given path
                // sending back with message
                Session::flash('success', 'Upload successful');
                return Redirect::to('/');
            }
            else {
                // sending back with error message.
                Session::flash('error', 'uploaded file is not valid');
                return Redirect::to('upload');
            }
        }
    }
}