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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.RelMe do
   6   @options [
   7     max_body: 2_000_000,
   8     receive_timeout: 2_000
   9   ]
  10
  11   if Pleroma.Config.get(:env) == :test do
  12     def parse(url) when is_binary(url), do: parse_url(url)
  13   else
  14     @cachex Pleroma.Config.get([:cachex, :provider], Cachex)
  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     with {:ok, %Tesla.Env{body: html, status: status}} when status in 200..299 <-
  28            Pleroma.HTTP.get(url, [], @options),
  29          {:ok, html_tree} <- Floki.parse_document(html),
  30          data <-
  31            Floki.attribute(html_tree, "link[rel~=me]", "href") ++
  32              Floki.attribute(html_tree, "a[rel~=me]", "href") do
  33       {:ok, data}
  34     end
  35   rescue
  36     e -> {:error, "Parsing error: #{inspect(e)}"}
  37   end
  38
  39   def maybe_put_rel_me("http" <> _ = target_page, profile_urls) when is_list(profile_urls) do
  40     {:ok, rel_me_hrefs} = parse(target_page)
  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