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Robust user authentication solution

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

defmodule Pow.Extension.Phoenix.Controller.Base do

  @moduledoc """

  Used with Pow Extension Phoenix controllers to handle messages and routes.



  ## Usage



      defmodule MyPowExtension.Phoenix.CustomController do

        use Pow.Extension.Phoenix.Controller.Base



        # ...

      end

  """

  alias Pow.{Config, Phoenix.Controller}



  @doc false

  defmacro __using__(config) do

    quote do

      use Controller, unquote(config)



      unquote(__MODULE__).__define_helper_methods__(unquote(config))

    end

  end



  @doc false

  defmacro __define_helper_methods__(config) do

    quote do

      @messages_fallback unquote(__MODULE__).__messages_fallback__(unquote(config), __MODULE__, __ENV__)



      @doc false

      def extension_messages(conn), do: unquote(__MODULE__).__messages_module__(conn, @messages_fallback)

    end

  end



  @doc false

  def __messages_module__(conn, fallback) do

    case Controller.messages(conn, fallback) do

      ^fallback -> fallback

      messages  -> Module.concat([messages, fallback])

    end

  end



  @doc false

  def __messages_fallback__(module) do

    [_controller | base] =

      module

      |> Module.split()

      |> Enum.reverse()



    [Messages]

    |> Enum.concat(base)

    |> Enum.reverse()

    |> Module.concat()

  end



  # TODO: Remove config fallback by 1.1.0

  def __messages_fallback__(config, module, env) do

    case Config.get(config, :messages_backend_fallback) do

      nil    ->

        __messages_fallback__(module)



      module ->

        IO.warn("Passing `:messages_backend_fallback` is deprecated", Macro.Env.stacktrace(env))



        module

    end

  end

end