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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.Web.RelMe do
   6   @hackney_options [
   7     pool: :media,
   8     recv_timeout: 2_000,
   9     max_body: 2_000_000
  10   ]
  11
  12   if Mix.env() == :test do
  13     def parse(url) when is_binary(url), do: parse_url(url)
  14   else
  15     def parse(url) when is_binary(url) do
  16       Cachex.fetch!(:rel_me_cache, url, fn _ ->
  17         {:commit, parse_url(url)}
  18       end)
  19     rescue
  20       e -> {:error, "Cachex error: #{inspect(e)}"}
  21     end
  22   end
  23
  24   def parse(_), do: {:error, "No URL provided"}
  25
  26   defp parse_url(url) do
  27     {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: @hackney_options)
  28
  29     data =
  30       Floki.attribute(html, "link[rel~=me]", "href") ++
  31         Floki.attribute(html, "a[rel~=me]", "href")
  32
  33     {:ok, data}
  34   rescue
  35     e -> {:error, "Parsing error: #{inspect(e)}"}
  36   end
  37
  38   def maybe_put_rel_me("http" <> _ = target_page, profile_urls) when is_list(profile_urls) do
  39     {:ok, rel_me_hrefs} = parse(target_page)
  40
  41     true = Enum.any?(rel_me_hrefs, fn x -> x in profile_urls end)
  42
  43     "me"
  44   rescue
  45     _ -> nil
  46   end
  47
  48   def maybe_put_rel_me(_, _) do
  49     nil
  50   end
  51 end