wizardbeard/app.rb

## app.rb
require "sinatra"
require "mogli"

enable :sessions
set :raise_errors, false
set :show_exceptions, false

# Scope defines what permissions that we are asking the user to grant.
# In this example, we are asking for the ability to publish stories
# about using the app, access to what the user likes, and to be able
# to use their pictures.  You should rewrite this scope with whatever
# permissions your app needs.
# See https://developers.facebook.com/docs/reference/api/permissions/
# for a full list of permissions
FACEBOOK_SCOPE = 'user_likes,user_photos,user_photo_video_tags'

unless ENV["FACEBOOK_APP_ID"] && ENV["FACEBOOK_SECRET"]
  abort("missing env vars: please set FACEBOOK_APP_ID and FACEBOOK_SECRET with your app credentials")
end

before do
  # HTTPS redirect
  if settings.environment == :production && request.scheme != 'https'
    redirect "https://#{request.env['HTTP_HOST']}"
  end
end

helpers do
  def url(path)
    base = "#{request.scheme}://#{request.env['HTTP_HOST']}"
    base + path
  end

  def post_to_wall_url
    "https://www.facebook.com/dialog/feed?redirect_uri=#{url("/close")}&display=popup&app_id=#{@app.id}";
  end

  def send_to_friends_url
    "https://www.facebook.com/dialog/send?redirect_uri=#{url("/close")}&display=popup&app_id=#{@app.id}&link=#{url('/')}";
  end

  def authenticator
    @authenticator ||= Mogli::Authenticator.new(ENV["FACEBOOK_APP_ID"], ENV["FACEBOOK_SECRET"], url("/auth/facebook/callback"))
  end

  def first_column(item, collection)
    return ' class="first-column"' if collection.index(item)%4 == 0
  end
end

# the facebook session expired! reset ours and restart the process
error(Mogli::Client::HTTPException) do
  session[:at] = nil
  redirect "/auth/facebook"
end

get "/" do
  redirect "/auth/facebook" unless session[:at]
  @client = Mogli::Client.new(session[:at])

  # limit queries to 15 results
  @client.default_params[:limit] = 15

  @app  = Mogli::Application.find(ENV["FACEBOOK_APP_ID"], @client)
  @user = Mogli::User.find("me", @client)

  # access friends, photos and likes directly through the user instance
  @friends = @user.friends[0, 4]
  @photos  = @user.photos[0, 16]
  @likes   = @user.likes[0, 4]

  # for other data you can always run fql
  @friends_using_app = @client.fql_query("SELECT uid, name, is_app_user, pic_square FROM user WHERE uid in (SELECT uid2 FROM friend WHERE uid1 = me()) AND is_app_user = 1")

  erb :index
end

# used by Canvas apps - redirect the POST to be a regular GET
post "/" do
  redirect "/"
end

# used to close the browser window opened to post to wall/send to friends
get "/close" do
  "<body onload='window.close();'/>"
end

get "/auth/facebook" do
  session[:at]=nil
  redirect authenticator.authorize_url(:scope => FACEBOOK_SCOPE, :display => 'page')
end

get '/auth/facebook/callback' do
  client = Mogli::Client.create_from_code_and_authenticator(params[:code], authenticator)
  session[:at] = client.access_token
  redirect '/'
end
	require "sinatra"
	require "mogli"

	enable :sessions
	set :raise_errors, false
	set :show_exceptions, false

	# Scope defines what permissions that we are asking the user to grant.
	# In this example, we are asking for the ability to publish stories
	# about using the app, access to what the user likes, and to be able
	# to use their pictures. You should rewrite this scope with whatever
	# permissions your app needs.
	# See https://developers.facebook.com/docs/reference/api/permissions/
	# for a full list of permissions
	FACEBOOK_SCOPE = 'user_likes,user_photos,user_photo_video_tags'

	unless ENV["FACEBOOK_APP_ID"] && ENV["FACEBOOK_SECRET"]
	abort("missing env vars: please set FACEBOOK_APP_ID and FACEBOOK_SECRET with your app credentials")
	end

	before do
	# HTTPS redirect
	if settings.environment == :production && request.scheme != 'https'
	redirect "https://#{request.env['HTTP_HOST']}"
	end
	end

	helpers do
	def url(path)
	base = "#{request.scheme}://#{request.env['HTTP_HOST']}"
	base + path
	end

	def post_to_wall_url
	"https://www.facebook.com/dialog/feed?redirect_uri=#{url("/close")}&display=popup&app_id=#{@app.id}";
	end

	def send_to_friends_url
	"https://www.facebook.com/dialog/send?redirect_uri=#{url("/close")}&display=popup&app_id=#{@app.id}&link=#{url('/')}";
	end

	def authenticator
	@authenticator \|\|= Mogli::Authenticator.new(ENV["FACEBOOK_APP_ID"], ENV["FACEBOOK_SECRET"], url("/auth/facebook/callback"))
	end

	def first_column(item, collection)
	return ' class="first-column"' if collection.index(item)%4 == 0
	end
	end

	# the facebook session expired! reset ours and restart the process
	error(Mogli::Client::HTTPException) do
	session[:at] = nil
	redirect "/auth/facebook"
	end

	get "/" do
	redirect "/auth/facebook" unless session[:at]
	@client = Mogli::Client.new(session[:at])

	# limit queries to 15 results
	@client.default_params[:limit] = 15

	@app = Mogli::Application.find(ENV["FACEBOOK_APP_ID"], @client)
	@user = Mogli::User.find("me", @client)

	# access friends, photos and likes directly through the user instance
	@friends = @user.friends[0, 4]
	@photos = @user.photos[0, 16]
	@likes = @user.likes[0, 4]

	# for other data you can always run fql
	@friends_using_app = @client.fql_query("SELECT uid, name, is_app_user, pic_square FROM user WHERE uid in (SELECT uid2 FROM friend WHERE uid1 = me()) AND is_app_user = 1")

	erb :index
	end

	# used by Canvas apps - redirect the POST to be a regular GET
	post "/" do
	redirect "/"
	end

	# used to close the browser window opened to post to wall/send to friends
	get "/close" do
	"<body onload='window.close();'/>"
	end

	get "/auth/facebook" do
	session[:at]=nil
	redirect authenticator.authorize_url(:scope => FACEBOOK_SCOPE, :display => 'page')
	end

	get '/auth/facebook/callback' do
	client = Mogli::Client.create_from_code_and_authenticator(params[:code], authenticator)
	session[:at] = client.access_token
	redirect '/'
	end