Rails - Jun 2012 - need a file upload plugin and a way to authenticate from another app

Hey all, 
i need to be able to create a mobile application that will upload a file to 
my rails site. 
i need the application to authenticate and then upload. 

I am using the basic roll-your-own authenticate system with a sessions and 
users controllers. 

Any ideas where best to find a tutorial or gem that can help explain how to 
get started with something like this?

thanks

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For authentication, I use devise, but you might use an authentication token 
method (though on a public network, you might want to use public/private 
key pairs). Paperclip and Carrierwave are good gems for file uploads.
 

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