github_omniauth_sinatra.rb

require 'sinatra/base'
require 'omniauth'

class Application < Sinatra::Base 

  use OmniAuth::Builder do
    provider :github, 'github_id', 'github_secret'
  end

  get '/' do
    '<a href="/auth/github">Sign in via Github</a>'
  end

  get '/auth/:name/callback' do
    "Welcome, #{request.env['omniauth.auth']['user_info']['nickname']}!"
  end
  
  run! if $0 == __FILE__
end