Example SmartApp Server using OAuth 2

config.ru

require './server'
run Sinatra::Application

Gemfile

source "https://rubygems.org"
gem 'sinatra'
gem 'oauth2'
gem 'json'

server.rb

require 'bundler/setup'
require 'sinatra'
require 'oauth2'
require 'json'

client_id = '0e1e1aa7-8404-4c96-a1c3-cdad2671bb9a'
api_key = '1d041ba7-0e9b-4ad0-b5ca-5fb667d221af'

redirect_uri = 'http://smartappserver.herokuapp.com/oauth/callback'

options = {
  site: 'https://graph.api.smartthings.com',
  authorize_url: '/oauth/authorize',
  token_url: '/oauth/token'
}

client = OAuth2::Client.new(client_id, api_key, options)

get '/' do
  %(<a href="/authorize">Connect with SmartThings</a>)
end

get '/authorize' do
  url = client.auth_code.authorize_url(redirect_uri: redirect_uri, scope: 'app')
  redirect url
end

get '/oauth/callback' do
  response = client.auth_code.get_token(params[:code], redirect_uri: redirect_uri, scope: 'app')
  response.token
end