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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Captcha.Kocaptcha do
   6   alias Pleroma.Captcha.Service
   7   @behaviour Service
   8
   9   @impl Service
  10   def new do
  11     endpoint = Pleroma.Config.get!([__MODULE__, :endpoint])
  12
  13     case Tesla.get(endpoint <> "/new") do
  14       {:error, _} ->
  15         %{error: "Kocaptcha service unavailable"}
  16
  17       {:ok, res} ->
  18         json_resp = Jason.decode!(res.body)
  19
  20         %{
  21           type: :kocaptcha,
  22           token: json_resp["token"],
  23           url: endpoint <> json_resp["url"],
  24           answer_data: json_resp["md5"]
  25         }
  26     end
  27   end
  28
  29   @impl Service
  30   def validate(_token, captcha, answer_data) do
  31     # Here the token is unsed, because the unencrypted captcha answer is just passed to method
  32     if not is_nil(captcha) and
  33          :crypto.hash(:md5, captcha) |> Base.encode16() == String.upcase(answer_data),
  34        do: :ok,
  35        else: {:error, "Invalid CAPTCHA"}
  36   end
  37 end