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Robust user authentication solution

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

defmodule PowPersistentSession.Plug.Base do

  @moduledoc """

  Base module for setting up persistent session plugs.



  See PowPersistentSession.Plug.Cookie for an implementation example.



  ## Configuration options



    * `:persistent_session_store` the persistent session store

    * `:cache_store_backend` the backend cache store

  """



  alias Plug.Conn

  alias Pow.{Config, Plug, Store.Backend.EtsCache}

  alias PowPersistentSession.Store.PersistentSessionCache



  @callback authenticate(Conn.t(), Config.t()) :: Conn.t()

  @callback create(Conn.t(), map(), Config.t()) :: Conn.t()



  defmacro __using__(_opts) do

    quote do

      @behaviour unquote(__MODULE__)



      import unquote(__MODULE__)



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

      def init(config), do: config



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

      def call(conn, config) do

        config =

          conn

          |> Plug.fetch_config()

          |> Config.merge(config)



        conn

        |> Conn.put_private(:pow_persistent_session, {__MODULE__, config})

        |> authenticate(config)

      end

    end

  end



  @spec store(Config.t()) :: {module(), Config.t()}

  def store(config) do

    case Config.get(config, :persistent_session_store, default_store(config)) do

      {store, store_config} -> {store, store_config}

      store                 -> {store, []}

    end

  end



  defp default_store(config) do

    backend = Config.get(config, :cache_store_backend, EtsCache)



    {PersistentSessionCache, [backend: backend]}

  end

end