users.rb

class Api::Client::V1::Users < Grape::API

  resources :users do
    RegistrationSteps = [
      ->(user) { FollowersPopulationService.new(user).create },
      ->(user) { TimelinesRegistrationService.new(user).create },
    ]

    params do
      requires :auth_token, type: String, desc: "Auth token picked up on the user activity on the device"
    end
    post '/facebook', rabl: 'v1/users/facebook' do
      begin
        @user = User.find_or_create_by_facebook_auth_token(params[:auth_token])

        unless @user.present?
          throw :error, status: 403, message: 'Invalid facebook auth token'
        end

        RegistrationSteps.each do |step|
          step.call(@user)
        end

        # @note lets try to collect information about the user as soon as
        # possible.
        Facebook::Feed::UserWorker.perform_async(@user.id, { months: 24 })
      rescue => boom
        Airbrake.notify(boom, parameters: params)
        throw :error, status: 400, message: boom.message
      end
    end

  end # auth

end