demarches-normaliennes/app/controllers/france_connect/particulier_controller.rb

class FranceConnect::ParticulierController < ApplicationController
  before_action :redirect_to_login_if_fc_aborted, only: [:callback]

  def login
    if FranceConnectService.enabled?
      redirect_to FranceConnectService.authorization_uri
    else
      redirect_to new_user_session_path
    end
  end

  def callback
    fci = FranceConnectService.find_or_retrieve_france_connect_information(params[:code])

    if fci.user.nil?
      preexisting_unlinked_user = User.find_by(email: fci.email_france_connect.downcase)

      if preexisting_unlinked_user.nil?
        fci.associate_user!(fci.email_france_connect)
        connect_france_connect_particulier(fci.user)
      else
        redirect_to france_connect_particulier_merge_path(fci.create_merge_token!)
      end
    else
      user = fci.user

      if user.can_france_connect?
        connect_france_connect_particulier(user)
      else
        fci.destroy
        redirect_to new_user_session_path, alert: t('errors.messages.france_connect.forbidden_html', reset_link: new_user_password_path)
      end
    end

  rescue Rack::OAuth2::Client::Error => e
    Rails.logger.error e.message
    redirect_france_connect_error_connection
  end

  def merge
  end

  private

  def redirect_to_login_if_fc_aborted
    if params[:code].blank?
      redirect_to new_user_session_path
    end
  end

  def connect_france_connect_particulier(user)
    if user_signed_in?
      sign_out :user
    end

    sign_in user

    user.update_attribute('loged_in_with_france_connect', User.loged_in_with_france_connects.fetch(:particulier))

    redirect_to stored_location_for(current_user) || root_path(current_user)
  end

  def redirect_france_connect_error_connection
    flash.alert = t('errors.messages.france_connect.connexion')
    redirect_to(new_user_session_path)
  end
end