oauth2_example.rb

# see http://github.com/intridea/oauth2
require 'rubygems'
require 'sinatra'
require 'oauth2'
require 'json'

class ConnectionLogger < Faraday::Middleware
  def call(env)
    env[:response].on_complete do |env|
      puts "RESULT: #{env[:status]}\n#{env[:body]}"
    end

    process_body_for_request(env)
    puts "#{env[:method].inspect} #{env[:url].to_s}"
    puts env[:request_headers].inspect if !env[:request_headers].empty?
    puts env[:body] if env[:body]
    @app.call env
  end
end

$client = OAuth2::Client.new('120094574673767', 'b54dc82476af2814e620b86776c42c0e', :site => 'https://graph.facebook.com', :adapter => :test)
$client.connection.build do |b|
  b.use ConnectionLogger
  b.adapter :net_http
end

get '/auth/facebook' do
  url = $client.web_server.authorize_url(
    :redirect_uri => redirect_uri,
    :scope => 'email,offline_access'
  )
  puts "Redirecting to URL: #{url.inspect}"
  redirect url
end

get '/auth/facebook/callback' do
  access_token = $client.web_server.access_token(params[:code], :redirect_uri => redirect_uri)
  user = JSON.parse(access_token.get('/me'))

  user.inspect
end

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

output.log

Redirecting to URL: "https://graph.facebook.com/oauth/authorize?scope=email%2Coffline_access&client_id=120094574673767&type=web_server&redirect_uri=http%3A%2F%2Flocalhost%3A4567%2Fauth%2Ffacebook%2Fcallback"
127.0.0.1 - - [22/Apr/2010 14:59:42] "GET /auth/facebook HTTP/1.1" 302 - 0.0013
:get https://graph.facebook.com/oauth/access_token?code=0b634250f9f698c348ab1e72-564393355%7CEhVdUzzMGXZ_BGY6BK3L9avyxps.&client_id=120094574673767&client_secret=b54dc82476af2814e620b86776c42c0e&type=web_server&redirect_uri=http%3A%2F%2Flocalhost%3A4567%2Fauth%2Ffacebook%2Fcallback
RESULT: 200
access_token=120094574673767|0b634250f9f698c348ab1e72-564393355|H87xBimxCdyA9Jr6KWXqXgL599o.
:get https://graph.facebook.com/me?access_token=120094574673767%7C0b634250f9f698c348ab1e72-564393355%7CH87xBimxCdyA9Jr6KWXqXgL599o.
RESULT: 200
{"id":"123","name":"Rick Olson"}
127.0.0.1 - - [22/Apr/2010 14:59:45] "GET /auth/facebook/callback?code=0b634250f9f698c348ab1e72-564393355%7CEhVdUzzMGXZ_BGY6BK3L9avyxps. HTTP/1.1" 200 284 0.8317