Refresh Token from Salesforce

app.rb

begin
  require 'sinatra'
  require 'omniauth'
  require 'omniauth-salesforce'

rescue LoadError
  require 'rubygems'
  require 'sinatra'
  require 'omniauth'
  require 'omniauth-salesforce'
end

set :port, 3000

use Rack::Session::Cookie
use OmniAuth::Builder do
  provider :salesforce, ENV['TEST_SALESFORCE_CLIENT_ID'], ENV['TEST_SALESFORCE_CLIENT_SECRET']
end

get '/' do
  <<-HTML
      <h1>Sign into Salesforce and get a refresh token. Try it... it's fun!</h1>
      <a href='/auth/salesforce'>Sign into Salesforce</a> with your xxx@sriracha.trailhead.com account
  HTML
end

get '/auth/:name/callback' do
  auth = request.env['omniauth.auth']
  puts auth
  "Here is your handy-dandy refresh token: #{auth['credentials']['refresh_token']}"
end