This is pretty old and I'm not currently using it so it's pretty stale. I highly suggest using a different library.
A dropbox library written in Go. I whipped up a few quick calls that I needed for a separate project but by no means does it cover the entire Dropbox API. Enjoy, and please contribute if you require more API methods.
It's compatible with go1 or at least a recent weekly release.
The library uses the most recent release of garyburd/go-oauth and will be automatically installed if you use go get to grab the package.
Install the library: go get github.com/nickoneill/go-dropbox, then import "github.com/nickoneill/go-dropbox" to use in your project. Create a new client with your app key and secret, then use the exported oauth client to request credentials.
Check the example project for more detailed usage.