Minimum viable OAuth 1.0a sign-in using Logos APIs

ruby_sinatra_logos_oauth_example

require 'sinatra'
require "oauth"
require "oauth/consumer"
require 'oauth/signature/plaintext'
require 'net/http'
require 'json/pure'

configure do
  set :session_secret, "<pick something random here>"
  enable :sessions
end

before do
  session[:oauth] ||= {}
  @consumer ||=OAuth::Consumer.new "<your key here>", "<your secret here>",
  {
    :site => "https://auth.logos.com",
    :signature_method => "PLAINTEXT",
    :authorize_path => "/oauth/v1/authorize",
    :access_token_path=>"/oauth/v1/token",
    :request_token_path=>"/oauth/v1/initiate"
  }

  if !session[:oauth][:request_token].nil? && !session[:oauth][:request_token_secret].nil?
    @request_token = OAuth::RequestToken.new(@consumer, session[:oauth][:request_token], session[:oauth][:request_token_secret])
  end

  if !session[:oauth][:access_token].nil? && !session[:oauth][:access_token_secret].nil?
    @access_token = OAuth::AccessToken.new(@consumer, session[:oauth][:access_token], session[:oauth][:access_token_secret])
  end
end

get '/' do
    if session[:is_logged_in]
      @res = @access_token.request(:get, "https://accountsapi.logos.com/v2/users/me")

      @parsed_json = JSON.parse(@res.body)

      @alias = @parsed_json["alias"]
      @email = @parsed_json["email"]
      @id = @parsed_json["id"]

      "Id: %s Alias: %s Email: %s" % [@id, @alias, @email]
    else
      return redirect "/request"
    end
end

get "/request" do
  @request_token = @consumer.get_request_token({:oauth_callback => "http://localhost:4567/callback"})
  session[:oauth][:request_token] = @request_token.token
  session[:oauth][:request_token_secret] = @request_token.secret

  redirect @request_token.authorize_url
end

get "/callback" do
  @access_token = @request_token.get_access_token :oauth_verifier => params[:oauth_verifier]
  session[:oauth][:access_token] = @access_token.token
  session[:oauth][:access_token_secret] = @access_token.secret

  session[:is_logged_in] = true

  return redirect "/"
end