Sinatra-based OAuth 2 client (I don't remember where I found this...)

client.rb

require 'sinatra'
require 'rack/oauth2'
require 'json'
require 'json/jwt'

def client
  # app id, app secret, and site are all test-env specific
  Rack::OAuth2::Client.new(
    :identifier   => 'd7633f880b4771b4f91f107a1a27835e',
    :secret       => '40dc03bf175980bccd15df10f9db1aa2',
    :redirect_uri => redirect_uri,
    :scheme       => 'http',
    :host         => 'growing-spring-4857.herokuapp.com',
    :token_endpoint => '/oauth2/token'
  )
end

get '/' do
  'working'
end

get '/logout' do
  response.set_cookie 'access_token', ''
  'logged out'
end

# get '/auth' do
#   redirect client.web_server.authorize_url(
#     :redirect_uri => redirect_uri
#   )
# end

# get '/auth/callback' do
#   access_token = client.web_server.get_access_token params[:code], :redirect_uri => redirect_uri
#   user = JSON.parse access_token.get('/current_user.json')
#   user.inspect
# end

get '/access' do
  c = client
  c.resource_owner_credentials = params[:username], params[:password]
  access_token = c.access_token!
  access_token.get('http://growing-spring-4857.herokuapp.com/records/1/root.xml').body
  JSON::JWT.decode(access_token.access_token)
end

def redirect_uri
  uri = URI.parse(request.url)
  uri.path = '/auth/callback'
  uri.query = nil
  uri.to_s
end