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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Captcha.Native do
   6   import Pleroma.Web.Gettext
   7   alias Pleroma.Captcha.Service
   8   @behaviour Service
   9
  10   @impl Service
  11   def new do
  12     case Captcha.get() do
  13       :error ->
  14         %{error: dgettext("errors", "Captcha error")}
  15
  16       {:ok, answer_data, img_binary} ->
  17         %{
  18           type: :native,
  19           token: token(),
  20           url: "data:image/png;base64," <> Base.encode64(img_binary),
  21           answer_data: answer_data
  22         }
  23     end
  24   end
  25
  26   @impl Service
  27   def validate(_token, captcha, captcha) when not is_nil(captcha), do: :ok
  28   def validate(_token, _captcha, _answer), do: {:error, dgettext("errors", "Invalid CAPTCHA")}
  29
  30   defp token do
  31     10
  32     |> :crypto.strong_rand_bytes()
  33     |> Base.url_encode64(padding: false)
  34   end
  35 end