facebook_service.rb

require "errors"

class FacebookService
  class << self

    def register(data_hash)
      data = AuthData.new(data_hash)
      auth = User::Facebook.find_by_uid(data.uid)
      if auth
        raise UserBlockedError if auth.user.blocked?
        auth.user.activate! unless auth.user.active?
        return auth.user
      end

      if user = User.find_by_email(data.email)
        raise UserBlockedError if user.blocked?
        raise ConfirmationRequiredError.new(user) if user.active?
      else
        user = UserFacebookRegistrationType.new
        user.password = SecureApp.generate_password
      end
      user.build_facebook :uid => data.uid

      UserPopulator.via_facebook(user, data)
      user.activate!

      user
    end

    def create_link(user, data_hash)
      data = AuthData.new(data_hash)
      auth = User::Facebook.find_by_uid(data.uid)

      if auth
        if auth.user.id == user.id
          raise AlreadyLinkedError auth.user.id == user.id
        else
          auth.destroy
        end
      end

      user.build_facebook :uid => data.uid
      UserPopulator.via_facebook(user, data)
      user.save!

      true
    end
  end
end