rel_me.ex
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rel_me.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.RelMe do
	@hackney_options [
	pool: :media,
	recv_timeout: 2_000,
	max_body: 2_000_000,
	with_body: true
	]

	if Pleroma.Config.get(:env) == :test do
	def parse(url) when is_binary(url), do: parse_url(url)
	else
	def parse(url) when is_binary(url) do
	Cachex.fetch!(:rel_me_cache, url, fn _ ->
	{:commit, parse_url(url)}
	end)
	rescue
	e -> {:error, "Cachex error: #{inspect(e)}"}
	end
	end

	def parse(_), do: {:error, "No URL provided"}

	defp parse_url(url) do
	with {:ok, %Tesla.Env{body: html, status: status}} when status in 200..299 <-
	Pleroma.HTTP.get(url, [], adapter: @hackney_options),
	data <-
	Floki.attribute(html, "link[rel~=me]", "href") ++
	Floki.attribute(html, "a[rel~=me]", "href") do
	{:ok, data}
	end
	rescue
	e -> {:error, "Parsing error: #{inspect(e)}"}
	end

	def maybe_put_rel_me("http" <> _ = target_page, profile_urls) when is_list(profile_urls) do
	{:ok, rel_me_hrefs} = parse(target_page)

	true = Enum.any?(rel_me_hrefs, fn x -> x in profile_urls end)

	"me"
	rescue
	_ -> nil
	end

	def maybe_put_rel_me(_, _) do
	nil
	end
	end