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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.



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

  handler module.



  ## Example



      plug Pow.Plug.RequireAuthenticated,

        error_handler: MyAppWeb.Pow.ErrorHandler

  """

  alias Plug.Conn

  alias Pow.{Config, Plug}



  @doc false

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

  def init(config) do

    Config.get(config, :error_handler) || raise_no_error_handler()

  end



  @doc false

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

  def call(conn, handler) do

    conn

    |> Plug.current_user()

    |> maybe_halt(conn, handler)

  end



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

  defp maybe_halt(_user, conn, handler) do

    conn

    |> handler.call(:already_authenticated)

    |> Conn.halt()

  end



  @spec raise_no_error_handler :: no_return

  defp raise_no_error_handler do

    Config.raise_error("No :error_handler configuration option provided. It's required to set this when using #{inspect __MODULE__}.")

  end

end