authenticate_customer.ex

defmodule MangoWeb.Plugs.AuthenticateCustomer do
  import Plug.Conn
  import Phoenix.Controller, only: [redirect: 2, put_flash: 3]

  def init(opts), do: nil

  def call(conn, _opts) do
    case conn.assigns[:current_customer] do
      nil ->
         conn
         |> put_session(:intending_to_visit, conn.request_path)
         |> put_flash(:info, "You must be signed in")
         |> redirect(to: "/login")
         |> halt
      _ ->
         conn
    end
  end
end