Koala throws exception as soon as the page loads for the first time

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Israel Pasos

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Nov 1, 2012, 11:54:48 AM11/1/12
to koala...@googlegroups.com
I've been fighting with this for some hours now and I can't figure it out. I deployed a FB app via Heroku and everything worked fin but all of a sudden when you visit the site you get automatically redirected to FB login. Koala is throwing the following exception on page load:

Koala::Facebook::APIError - GraphMethodException: Unsupported get request.:

And here's the Sinatra code, please excuse the puts and printfs:

require "sinatra"
require 'koala'


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.
# for a full list of permissions
FACEBOOK_SCOPE = 'user_likes,user_photos,user_photo_video_tags,email,publish_actions'

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'
  puts "Redirect HTTPS"
    redirect "https://#{request.env['HTTP_HOST']}"
  end
end

helpers do
  def host
    request.env['HTTP_HOST']
  end

  def scheme
    request.scheme
  end

  def url_no_scheme(path = '')
    "//#{host}#{path}"
  end

  def url(path = '')
    "#{scheme}://#{host}#{path}"
  end

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

end

# the facebook session expired! reset ours and restart the process changing
error(Koala::Facebook::APIError) do
  puts "<--------- ERROR ---------->"
  session[:access_token] = nil
  redirect "/auth/facebook"
end

get "/" do
  # Get base API Connection
  printf("<---------- Session %s ------------->",session[:access_token])
  @graph  = Koala::Facebook::API.new(session[:access_token])
  puts "<--------- @ GRAPH ---------->"

  # Get public details of current application
  printf("<----------- ENV[FACEBOOK_APP_ID]: %s ------------->",ENV["FACEBOOK_APP_ID"])
  @access_token = params[:access_token] || facebook_cookies[:access_token]
  @app  =  @graph.get_object(ENV["FACEBOOK_APP_ID"])
  printf("<----------- @app %s ------------>",@app)
  puts "<--------- @ APP ---------->"  

  if session[:access_token]
    @user    = @graph.get_object("me")
    @friends = @graph.get_connections('me', 'friends')
    @photos  = @graph.get_connections('me', 'photos')
    @likes   = @graph.get_connections('me', 'likes').first(4)

    # for other data you can always run fql
    @friends_using_app = @graph.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")
  end
  erb :index
end

get "/terms" do
  erb :terms
end

get "/privacy" do
  erb :privacy
end

# used by Canvas apps - redirect the POST to be a regular GET
post "/" do
puts "Redirect canvas"
  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 "/sign_out" do
  session[:access_token] = nil
  puts "Redirect signout"
  redirect '/'
end

get "/auth/facebook" do
  session[:access_token] = nil
  puts "Redirect auth"
  redirect authenticator.url_for_oauth_code(:permissions => FACEBOOK_SCOPE)
end

get '/auth/facebook/callback' do
session[:access_token] = authenticator.get_access_token(params[:code])
puts "callback Error"
redirect '/'
end

get '/plan_create' do
erb :plan_create
end

Hopefully someone smarter than me can help me figure this out. Thank you.
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