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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   alias Pleroma.Captcha.Service
   7   @behaviour Service
   8
   9   @impl Service
  10   def new do
  11     case Captcha.get() do
  12       :error ->
  13         %{error: :captcha_error}
  14
  15       {:ok, answer_data, img_binary} ->
  16         %{
  17           type: :native,
  18           token: token(),
  19           url: "data:image/png;base64," <> Base.encode64(img_binary),
  20           answer_data: answer_data
  21         }
  22     end
  23   end
  24
  25   @impl Service
  26   def validate(_token, captcha, captcha) when not is_nil(captcha), do: :ok
  27   def validate(_token, _captcha, _answer), do: {:error, :invalid}
  28
  29   defp token do
  30     10
  31     |> :crypto.strong_rand_bytes()
  32     |> Base.url_encode64(padding: false)
  33   end
  34 end