rel_me.ex 1.24 KB
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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,
    timeout: 2_000,
    recv_timeout: 2_000,
    max_body: 2_000_000
  ]

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

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

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  defp parse_url(url) do
    {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: @hackney_options)

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    data =
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      Floki.attribute(html, "link[rel~=me]", "href") ++
        Floki.attribute(html, "a[rel~=me]", "href")
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    {:ok, data}
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  rescue
    e -> {:error, "Parsing error: #{inspect(e)}"}
  end

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  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)

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    "me"
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  rescue
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    _ -> nil
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  end

  def maybe_put_rel_me(_, _) do
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    nil
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  end
end