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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 phoenix controllers controller_callbacks.ex
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lib/extensions/email_confirmation/phoenix/controllers/controller_callbacks.ex 

defmodule PowEmailConfirmation.Phoenix.ControllerCallbacks do

  @moduledoc false

  use Pow.Extension.Phoenix.ControllerCallbacks.Base



  alias Plug.Conn

  alias Pow.{Phoenix.Controller, Plug}

  alias PowEmailConfirmation.Phoenix.Mailer



  def before_process(Pow.Phoenix.RegistrationController, :update, conn, _config) do

    user = Plug.current_user(conn)



    Conn.put_private(conn, :pow_user_before_update, user)

  end



  def before_respond(Pow.Phoenix.RegistrationController, :create, {:ok, user, conn}, _config) do

    send_confirmation_email(user, conn)



    {:ok, user, conn}

  end

  def before_respond(Pow.Phoenix.RegistrationController, :update, {:ok, user, conn}, _config) do

    maybe_send_confirmation_email(user, conn)



    {:ok, user, conn}

  end



  defp maybe_send_confirmation_email(user, conn) do

    case should_send_email?(user, conn.private[:pow_user_before_update]) do

      true  -> send_confirmation_email(user, conn)

      false -> {:ok, user, conn}

    end

  end



  defp should_send_email?(_user, nil), do: false

  defp should_send_email?(%{email_confirmed_at: confirmed_at}, _user) when not is_nil(confirmed_at), do: false

  defp should_send_email?(%{email_confirmed_at: nil, email_confirmation_token: new_token}, %{email_confirmation_token: old_token}),

    do: new_token != old_token



  @spec send_confirmation_email(map(), Conn.t()) :: {:ok, map(), Conn.t()}

  def send_confirmation_email(user, conn) do

    token = user.email_confirmation_token

    url   = Controller.router_helpers(conn).pow_email_confirmation_confirmation_url(conn, :show, token)

    email = Mailer.email_confirmation(conn, user, url)



    Pow.Phoenix.Mailer.deliver(conn, email)



    {:ok, user, conn}

  end

end