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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   import Pleroma.Web.Gettext
   7   alias Pleroma.Captcha.Service
   8
   9   @behaviour Service
  10   @default_endpoint "https://captcha.kotobank.ch"
  11
  12   @impl Service
  13   def new do
  14     endpoint = Pleroma.Config.get([__MODULE__, :endpoint], @default_endpoint)
  15
  16     case Tesla.get(endpoint <> "/new") do
  17       {:error, _} ->
  18         %{error: dgettext("errors", "Kocaptcha service unavailable")}
  19
  20       {:ok, res} ->
  21         json_resp = Jason.decode!(res.body)
  22
  23         %{
  24           type: :kocaptcha,
  25           token: json_resp["token"],
  26           url: endpoint <> json_resp["url"],
  27           answer_data: json_resp["md5"]
  28         }
  29     end
  30   end
  31
  32   @impl Service
  33   def validate(_token, captcha, answer_data) do
  34     # Here the token is unsed, because the unencrypted captcha answer is just passed to method
  35     if not is_nil(captcha) and
  36          :crypto.hash(:md5, captcha) |> Base.encode16() == String.upcase(answer_data),
  37        do: :ok,
  38        else: {:error, dgettext("errors", "Invalid CAPTCHA")}
  39   end
  40 end