The only messy part is the OAuth callback, which I did manually instead of using one of the OAuth2 libraries, because at the time I was trying to identify a possible bug in an OAuth implementation.
Keep in mind that it's not the cleanest or most idiomatic Go code, but even that aside, it's relatively concise - and more importantly, straightforward to understand, even if you've never written Go before.
Unless he's updated it, his 2 year old Go code won't compile any more. 2 years ago, Go was a rapidly-churning target. Now, it's settled off to Go 1, but you'll have to go through and fix some changes--and there may now be better ways to do things.
