OAuth Example w/ Google

oauth.rb

require 'httparty'
require 'sinatra'
require 'securerandom'
require 'json'

get '/' do
  erb :index
end

get '/redirect_auth_url' do
  client_id = ENV["CLIENT_ID"]
  redirect "https://accounts.google.com/o/oauth2/auth?" +
  "scope=email%20profile" +
  "&state=security_token%3D138r5719ru3e1%26url%3Dhttps://oa2cb.example.com/myHome"
  "&redirect_uri=http://localhost:9393/oauth2callback" +
  "&response_type=code" +
  "&client_id=#{client_id}" +
  "&approval_prompt=force"
end

get '/oauth2callback' do

  # p params['code']
  
  token_response = HTTParty.post("https://accounts.google.com/o/oauth2/token",
                                  body: {
                                    code: params[:code],
                                    client_id: ENV["CLIENT_ID"],
                                    redirect_uri: "http://localhost:9393/oauth2callback",
                                    client_secret: ENV["CLIENT_SECRET"],
                                    grant_type: "authorization_code"
                                  })

  # p token_response['access_token']

  people_response = HTTParty.get("https://www.googleapis.com/plus/v1/people/me?access_token=#{token_response['access_token']}")
  p people_response

end