Facebook Flow

pseudo client code

var User = angular.extend(Resource,{});


var responseFromFacebook = angular.request.params;
var user = new User({
  facebookAccessToken: responseFromFacebook.token,
  facebookTokenExpiresAt: responseFromFacebook.expires_at,
  facebookId: responseFromFacebook.profile.id
});

user.postToServer();

User

class User
  def facebook
    fa_token = facebook_access_token
    if facebook_expires_at && facebook_expires_at < Time.now
      # IF WE THINK THE TOKEN HAS EXPIRED, TRY TO UPDATE IT
      oauth = Koala::Facebook::OAuth.new(ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_APP_SECRET'])
      new_access_info = oauth.exchange_access_token_info(facebook_access_token)

      new_access_token = new_access_info["access_token"]
      new_access_expires_at = DateTime.now + new_access_info["expires"].to_i.seconds
      
      fa_token = new_access_token

      update_attributes!(:facebook_access_token => new_access_token,
                              :facebook_expires_at => new_access_expires_at )
    end
    @facebook ||= Koala::Facebook::API.new(fa_token)
    block_given? ? yield(@facebook) : @facebook
  
    rescue Koala::Facebook::APIError => e
      # IF WE STILL FAIL, THE REFRESH OF THE TOKEN FAILED, SO CLEAR IT OUT AND THE USER WILL HAVE TO RECONNECT, BUT DON'T 
      # LET THE FAILURE THROW AN ERROR VISIBLE TO THE USER
      update_attributes(facebook_access_token: nil)
      logger.info e.to_s
      nil
  end
end

War

class War
  def post_to_facebook
    response = user.facebook.put_connections("me", "links", 
      link: "http://#{ENV['HOST']}/bets/#{id}".gsub(/localhost/,"test.com"),
      name: "I bet ",
      message: "I bet #{facebook_title}",
      picture: user.avatar.thumb.url
    )
    
    if response.token_expires_at
      update_attributes(facebook_expires_at: response.token_expires_at)
    end
    
    response
  end
end