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Robust user authentication solution

Security advisory: This version has known vulnerabilities. View advisories
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pow lib pow plug require_not_authenticated.ex
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lib/pow/plug/require_not_authenticated.ex 

defmodule Pow.Plug.RequireNotAuthenticated do

  @moduledoc """

  This plug ensures that a user hasn't already been authenticated.



  Example:



    plug Pow.Plug.RequireAuthenticated,

      error_handler: MyAppWeb.Pow.ErrorHandler



  You can see `Pow.Phoenix.PlugErrorHandler` for an example of the error

  handler module.

  """

  alias Plug.Conn

  alias Pow.{Config, Plug}



  @spec init(Config.t()) :: Config.t()

  def init(config), do: config



  @spec call(Conn.t(), Config.t()) :: Conn.t()

  def call(conn, config) do

    conn

    |> Plug.current_user()

    |> maybe_halt(conn, config)

  end



  defp maybe_halt(nil, conn, _config), do: conn

  defp maybe_halt(_user, conn, config) do

    handler = Config.get(config, :error_handler, nil)



    case handler do

      nil ->

        Conn.halt(conn)



      handler ->

        conn

        |> handler.call(:already_authenticated)

        |> Conn.halt()

    end

  end

end