AuthenticationService example

gistfile1.rb

class AuthenticationsController < ApplicationController
  def create

    service = AuthenticationService

    response = if current_user.present?
      service.join(
        :omniauth_hash => request.env['omniauth'],
        :user => current_user
      )
    else
      service.authenticate_or_register(
        :omniauth_hash => request.env['omniauth']
      )
    end

    case response.state

    when :user_found
      sign_in_and_redirect(:user, response[:user])

    when :user_created
      sign_in(:user, response[:user])
      redirect_to welcome_from_social_network_path(response[:provider])

    when :authentication_joined
      url = if request.referer =~ /.+settings$/ #From settings page
        settings_user_path(response[:user])
      else
        find_friends_from_path(response[:provider])
      end
      redirect_to url

    when :user_data_incomplete
      send_user_data_form(response)

    else
      redirect_to new_user_registration_url

    end

  end

  def finish

    user_data = session[:saved_response][:user_data].merge(params)
    auth_hash = session[:saved_response][:auth_hahs]
    session.delete :saved_response

    response = AuthenticationService.register(
      :user_data => user_data,
      :auth_hash => auth_hash
    )

    case response.state

    when :user_data_incomplete
      send_user_data_form(response)

    when :user_created
      sign_in(:user, response[:user])
      redirect_to welcome_from_social_network_path(response[:provider])

    else
      redirect_to new_user_registration_url

    end

  end

  private

  def send_user_data_form(response)
    @user = response[:user]
    session[:saved_response] = response.to_hash
    render :need_more_information, :layout => "registration_layout"
  end
end