ezcontainer_example/lib/ezcontainer_railway_web/controllers/session_controller.ex

defmodule EzcontainerRailwayWeb.SessionController do
  alias EzcontainerRailway.Railway
  use EzcontainerRailwayWeb, :controller

  def token(conn, %{"railway_token" => token}) do
    case get_projects(token) do
      resp when is_list(resp) ->
        conn
        |> put_session(:railway_token, token)
        |> assign(:railway_token, token)
        |> redirect(to: "/containers")
      nil ->
        conn
        |> put_flash(:error, "Invalid Token")
        |> redirect(to: "/")
    end
  end

  defp get_projects(token) do
    case EzcontainerRailway.Railway.get_projects(token) do
      {:error, _} ->
        nil
      {:ok, data} ->
        data
    end
  end
end