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Robust user authentication solution

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

defmodule PowEmailConfirmation.Plug do

  @moduledoc false

  alias Pow.Plug

  alias PowEmailConfirmation.Ecto.Context



  @spec confirm_email(Conn.t(), binary()) :: {:ok, map(), Conn.t()} | {:error, map(), Conn.t()} | no_return

  def confirm_email(conn, token) do

    config = Plug.fetch_config(conn)



    config

    |> Context.get_by_confirmation_token(token)

    |> maybe_confirm_email(conn, config)

  end



  defp maybe_confirm_email(nil, conn, _config) do

    {:error, nil, conn}

  end

  defp maybe_confirm_email(user, conn, config) do

    config

    |> Context.confirm_email(user)

    |> case do

      {:error, changeset} -> {:error, changeset, conn}

      {:ok, user}         -> {:ok, user, maybe_renew_conn(conn, user, config)}

    end

  end



  defp maybe_renew_conn(conn, %{id: user_id} = user, config) do

    mod = config[:mod]



    case Plug.current_user(conn) do

      %{id: ^user_id} -> mod.do_create(conn, user)

      _any            -> conn

    end

  end

end