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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 store persistent_session_cache.ex
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lib/extensions/persistent_session/store/persistent_session_cache.ex 

defmodule PowPersistentSession.Store.PersistentSessionCache do

  @moduledoc false

  use Pow.Store.Base,

    ttl: :timer.hours(24) * 30,

    namespace: "persistent_session"



  alias Pow.{Operations, Store.Base}



  @impl true

  @spec put(Base.config(), binary(), {map(), list()}) :: :ok

  def put(config, id, {user, metadata}) do

    Base.put(config, backend_config(config), {id, {user, metadata}})

  end



  @impl true

  @spec get(Base.config(), binary()) :: {map(), list()} | nil | :not_found

  def get(config, id) do

    config

    |> Base.get(backend_config(config), id)

    |> convert_old_value()

    |> reload(config)

  end



  # TODO: Remove by 1.1.0

  defp convert_old_value(:not_found), do: :not_found

  defp convert_old_value({user, metadata}), do: {user, metadata}

  defp convert_old_value(clauses) when is_list(clauses), do: {clauses, []}



  defp reload(:not_found, _config), do: :not_found

  defp reload(value, config) do

    case Keyword.has_key?(config, :pow_config) do

      true ->

        do_reload(value, config)



      # TODO: Remove by 1.1.0

      false ->

        IO.warn("#{inspect __MODULE__}.get/2 call without `:pow_config` in second argument is deprecated, find the migration step in the changelog.")



        value

    end

  end



  # TODO: Remove by 1.1.0

  defp do_reload({clauses, metadata}, config) when is_list(clauses) do

    pow_config = fetch_pow_config!(config)



    case Operations.get_by(clauses, pow_config) do

      nil  -> nil

      user -> {user, metadata}

    end

  end

  defp do_reload({user, metadata}, config) do

    pow_config = fetch_pow_config!(config)



    case Operations.reload(user, pow_config) do

      nil  -> nil

      user -> {user, metadata}

    end

  end



  defp fetch_pow_config!(config), do: Keyword.get(config, :pow_config) || raise "No `:pow_config` value found in the store config."

end