Authenticate users via Github

[JoshCheek]

Part of the Endpoints milestone.

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Authenticate a user against Github. I assume some of our 1406ers have done this already, maybe check out their projects to see how they did it, or ping them on Slack to see if they'd be willing to help. There might be a gem for this, or maybe it's some configuration on the normal oauth stuff.

• [ ] Get Github to authenticate the user and give us back whatever they give us back.
• [ ] Identify what information we care about, we'll call this the auth info. Maybe this is just the Github username, maybe more, whatever, we can always change it later.
• [ ] If Sinatra comes with sessions out of the box, place the auth info into their session.
• [ ] If Sinatra does not come with sessions out of the box
  • [ ] Place the auth info into their cookies
  • [ ] Make a new issue to add sessions
  • [ ] Make a new issue to store the user's auth info in the session instead of the cookies
  • [ ] Link to the new issues on the milestone

[tyrbo]

Sinatra does come with sessions. See: http://www.sinatrarb.com/faq.html#sessions

I didn't authenticate through Github, but through Twitch.tv. But that was using OmniAuth. Looks like you can use OmniAuth with Sinatra (perhaps? https://github.com/intridea/omniauth/wiki/Sinatra-Example) but would have to play around with it.