kocaptcha.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Captcha.Kocaptcha do
	alias Pleroma.Captcha.Service
	@behaviour Service

	@impl Service
	def new do
	endpoint = Pleroma.Config.get!([__MODULE__, :endpoint])

	case Pleroma.HTTP.get(endpoint <> "/new") do
	{:error, _} ->
	%{error: :kocaptcha_service_unavailable}

	{:ok, res} ->
	json_resp = Jason.decode!(res.body)

	%{
	type: :kocaptcha,
	token: json_resp["token"],
	url: endpoint <> json_resp["url"],
	answer_data: json_resp["md5"],
	seconds_valid: Pleroma.Config.get([Pleroma.Captcha, :seconds_valid])
	}
	end
	end

	@impl Service
	def validate(_token, captcha, answer_data) do
	# Here the token is unsed, because the unencrypted captcha answer is just passed to method
	if not is_nil(captcha) and
	:crypto.hash(:md5, captcha) \|> Base.encode16() == String.upcase(answer_data),
	do: :ok,
	else: {:error, :invalid}
	end
	end