Arquivos de Exemplo de como integrar aplicações Ruby ao Facebook

sinatra_fb_canvas_app.rb

require 'rubygems'
require 'sinatra'
require 'haml'
require 'koala'

enable :sessions

set :facebook, {:app_id       => 'Application ID',
                :app_secret   => 'Application Secret',
                :callback_url => 'http://localhost:3000/canvas/'}

before do
  authenticate!
end

post '/canvas/' do
  haml :index
end

private

def authenticate!
  if params.include?('signed_request') && oauth_access_token.include?('user_id')
    session[:oauth_access_token] = oauth_access_token['oauth_token']
  end
end

helpers do
  def my_infos
    graph.get_object('me')
  end

  def graph
    Koala::Facebook::GraphAPI.new(session[:oauth_access_token])
  end

  def oauth
    Koala::Facebook::OAuth.new(settings.facebook[:app_id], settings.facebook[:app_secret])
  end

  def oauth_access_token
    oauth.parse_signed_request(params['signed_request'])
  end
end

__END__

@@ layout
!!!
%html
  %head
    %title Test
  %body
    =yield

@@ index
%h1 Facebook - Website Application
%p
  %h2
    Seja bem vindo #{my_infos['name']}

  %h2
    Suas informações básicas são:

  %ul
    - my_infos.each do |key, value|
      %li
        <b>#{key}:</b> #{value}

%p
  %a{:href=>"http://developers.facebook.com/docs/authentication/"} Documentação do Facebook sobre autenticação
%p
  %h3
    %a{:href=>"http://blog.serraduralabs.com"} Quer um tutorial completo?<br /> Acesse: http://blog.serraduralabs.com

sinatra_fb_website_app_1.rb

require 'rubygems'
require 'sinatra'
require 'haml'
require 'koala'

enable :sessions

set :fb_app_id, 'Application ID'
set :fb_app_secret, 'Application Secret'

# A URL de callback não pode ser igual a URL de acesso configurada no Facebook
# caso contrário ocorrerá o ERRO:
# {
#   "error": {
#     "type": "OAuthException",
#     "message": "Error validating verification code."
#   }
# }
set :fb_callback_url, 'http://localhost:3000/authenticate'

get '/' do
  haml :index
end

get '/authenticate' do
  authenticate!
  redirect to('/')
end

helpers do
  def authenticate!
    return if session[:oauth_access_token]

    if params.include?('code')
      session[:oauth_access_token] = oauth_access_token
    end
  end

  def authenticated?
    session[:oauth_access_token]
  end

  def my_infos
    begin
      graph.get_object('me')
    rescue Koala::Facebook::APIError
      session[:oauth_access_token] = nil
      redirect to('/')
    end
  end

  def graph
    Koala::Facebook::GraphAPI.new(session[:oauth_access_token])
  end

  def oauth
    Koala::Facebook::OAuth.new(settings.fb_app_id, settings.fb_app_secret, settings.fb_callback_url)
  end

  def oauth_access_token
    oauth.get_access_token(params['code'])
  end
end

__END__

@@ layout
!!!
%html
  %head
    %title Test
  %body
    =yield

@@ index
- if not authenticated?
  :javascript
    url          = 'https://graph.facebook.com/oauth/authorize?';
    client_id    = 'client_id=#{settings.fb_app_id}';
    redirect_uri = 'redirect_uri=#{settings.fb_callback_url}';

    top.location.href = url + '&' + client_id + '&' + redirect_uri;
    // -- Fim do Javascript

- if authenticated?
  %h1 Facebook - Website Application
  %p
    %h2
      Seja bem vindo #{my_infos['name']}

    %h2
      Suas informações básicas são:

    %ul
      - my_infos.each do |key, value|
        %li
          <b>#{key}:</b> #{value}

%p
  %a{:href=>"http://developers.facebook.com/docs/authentication/"} Documentação do Facebook sobre autenticação
%p
  %h3
    %a{:href=>"http://blog.serraduralabs.com"} Quer um tutorial completo?<br /> Acesse: http://blog.serraduralabs.com

sinatra_fb_website_app_2.rb

require 'rubygems'
require 'sinatra'
require 'haml'
require 'koala'

enable :sessions

set :facebook, {:app_id     => 'Application ID',
                :app_secret => 'Application Secret',
                # A URL de callback não pode ser igual a URL de acesso configurada no Facebook
                # caso contrário ocorrerá o ERRO:
                # {
                #   "error": {
                #     "type": "OAuthException",
                #     "message": "Error validating verification code."
                #   }
                # }
                :callback_url => 'http://localhost:3000/authenticate'}

before '/' do
  authorize!
end

post '/' do
  haml :index
end

get '/' do
  haml :index
end

get '/authorize' do
  haml :authorize
end

get '/authenticate' do
  authenticate!
  redirect to('/')
end

private

def authorize!
  if not authenticated?
    renew_authorization
  end
end

helpers do
  def authenticate!
    return if authenticated?

    if params.include?('code')
      session[:oauth_access_token] = oauth_access_token
    end
  end

  def authenticated?
    session[:oauth_access_token]
  end

  def my_infos
    execute do
      graph.get_object('me')
    end
  end

  def execute
    begin
      yield
    rescue Koala::Facebook::APIError
      renew_authorization
    end
  end

  def renew_authorization
    session[:oauth_access_token] = nil
    redirect to('/authorize')
  end

  def graph
    Koala::Facebook::GraphAPI.new(session[:oauth_access_token])
  end

  def oauth
    Koala::Facebook::OAuth.new(settings.facebook[:app_id], settings.facebook[:app_secret], settings.facebook[:callback_url])
  end

  def oauth_access_token
    oauth.get_access_token(params['code'])
  end
end

__END__

@@ layout
!!!
%html
  %head
    %title Test
  %body
    =yield


@@ authorize
:javascript
  url          = 'https://graph.facebook.com/oauth/authorize?';
  client_id    = 'client_id=#{settings.facebook[:app_id]}';
  redirect_uri = 'redirect_uri=#{settings.facebook[:callback_url]}';

  top.location.href = url + '&' + client_id + '&' + redirect_uri;
  // -- Fim do Javascript


@@ index
%h1 Facebook - Website Application
%p
  %h2
    Seja bem vindo #{my_infos['name']}

  %h2
    Suas informações básicas são:

  %ul
    - my_infos.each do |key, value|
      %li
        <b>#{key}:</b> #{value}

%p
  %a{:href=>"http://developers.facebook.com/docs/authentication/"} Documentação do Facebook sobre autenticação
%p
  %h3
    %a{:href=>"http://blog.serraduralabs.com"} Quer um tutorial completo?<br /> Acesse: http://blog.serraduralabs.com