A few here:

- Check the extension as well as the mimetype
- Only allow certain types
- Check the filesize if needed
- Make sure the file is a valid file resource
- Make sure there are no errors upon uploading

I however have create a file upload plugin. You can use the plugin
itself or you can take a look at how its written and get an idea.

http://www.milesj.me/resources/script/uploader-plugin
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