devise Devise & OmniAuth Multiple Providers Create Controller Concern omni_concern.rb

Example

module OmniConcern
  extend ActiveSupport::Concern
  def create
    auth_params = request.env["omniauth.auth"]
    provider = AuthenticationProvider.get_provider_name(auth_params.try(:provider)).first
    authentication = provider.user_authentications.where(uid: auth_params.uid).first
    existing_user = User.where('email = ?', auth_params['info']['email']).try(:first)
    if user_signed_in?
      SocialAccount.get_provider_account(current_user.id,provider.id).first_or_create(user_id: current_user.id ,  authentication_provider_id: provider.id , token: auth_params.try(:[],"credentials").try(:[],"token") , secret: auth_params.try(:[],"credentials").try(:[],"secret"))
      redirect_to new_user_registration_url
    elsif authentication
      create_authentication_and_sign_in(auth_params, existing_user, provider)
    else
      create_user_and_authentication_and_sign_in(auth_params, provider)
    end
  end
  def sign_in_with_existing_authentication(authentication)
    sign_in_and_redirect(:user, authentication.user)
  end
  def create_authentication_and_sign_in(auth_params, user, provider)
    UserAuthentication.create_from_omniauth(auth_params, user, provider)
    sign_in_and_redirect(:user, user) 
  end
  def create_user_and_authentication_and_sign_in(auth_params, provider)
    user = User.create_from_omniauth(auth_params)
    if user.valid?
        create_authentication_and_sign_in(auth_params, user, provider)
    else
        flash[:error] = user.errors.full_messages.first
        redirect_to new_user_registration_url
    end
 end
end