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Robust user authentication solution

Security advisory: This version has known vulnerabilities. View advisories
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pow lib pow phoenix controllers plug_error_handler.ex
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lib/pow/phoenix/controllers/plug_error_handler.ex 

defmodule Pow.Phoenix.PlugErrorHandler do

  @moduledoc """

  Used with `Pow.Plug.RequireAuthenticated` and

  `Pow.Plug.RequireNotAuthenticated`.

  """

  alias Phoenix.Controller

  alias Plug.Conn

  alias Pow.Phoenix.{Messages, Routes}



  import Pow.Phoenix.Controller, only: [messages: 2, routes: 2]



  @doc """

  Redirect user and add error flash message.



  For `:not_authenticated` calls, the flash message defaults to

  `Pow.Phoenix.Messages.user_not_authenticated/1` and the user is redirected to

  `Pow.Phoenix.Routes.user_not_authenticated_path/1`.



  For `:already_authenticated` calls, the flash message defaults to

  `Pow.Phoenix.Messages.user_already_authenticated/1` and the user is redirected to

  `Pow.Phoenix.Routes.user_already_authenticated_path/1`.

  """

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

  def call(conn, :not_authenticated) do

    conn

    |> Controller.put_flash(:error, messages(conn, Messages).user_not_authenticated(conn))

    |> Controller.redirect(to: routes(conn, Routes).user_not_authenticated_path(conn))

  end

  def call(conn, :already_authenticated) do

    conn

    |> Controller.put_flash(:error, messages(conn, Messages).user_already_authenticated(conn))

    |> Controller.redirect(to: routes(conn, Routes).user_already_authenticated_path(conn))

  end

end