pleroma

html.ex (2208B)

# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.HTML do
  # Scrubbers are compiled on boot so they can be configured in OTP releases
  #  @on_load :compile_scrubbers
  def compile_scrubbers do
    dir = Path.join(:code.priv_dir(:pleroma), "scrubbers")
    dir
    |> Pleroma.Utils.compile_dir()
    |> case do
      {:error, _errors, _warnings} ->
        raise "Compiling scrubbers failed"
      {:ok, _modules, _warnings} ->
        :ok
    end
  end
  defp get_scrubbers(scrubber) when is_atom(scrubber), do: [scrubber]
  defp get_scrubbers(scrubbers) when is_list(scrubbers), do: scrubbers
  defp get_scrubbers(_), do: [Pleroma.HTML.Scrubber.Default]
  def get_scrubbers do
    Pleroma.Config.get([:markup, :scrub_policy])
    |> get_scrubbers
  end
  def filter_tags(html, nil) do
    filter_tags(html, get_scrubbers())
  end
  def filter_tags(html, scrubbers) when is_list(scrubbers) do
    Enum.reduce(scrubbers, html, fn scrubber, html ->
      filter_tags(html, scrubber)
    end)
  end
  def filter_tags(html, scrubber) do
    {:ok, content} = FastSanitize.Sanitizer.scrub(html, scrubber)
    content
  end
  def filter_tags(html), do: filter_tags(html, nil)
  def strip_tags(html), do: filter_tags(html, FastSanitize.Sanitizer.StripTags)
  def ensure_scrubbed_html(
        content,
        scrubbers,
        fake,
        callback
      ) do
    content =
      content
      |> filter_tags(scrubbers)
      |> callback.()
    if fake do
      {:ignore, content}
    else
      {:commit, content}
    end
  end
  @spec extract_first_external_url_from_object(Pleroma.Object.t()) ::
          {:ok, String.t()} | {:error, :no_content}
  def extract_first_external_url_from_object(%{data: %{"content" => content}})
      when is_binary(content) do
    url =
      content
      |> Floki.parse_fragment!()
      |> Floki.find("a:not(.mention,.hashtag,.attachment,[rel~=\"tag\"])")
      |> Enum.take(1)
      |> Floki.attribute("href")
      |> Enum.at(0)
    {:ok, url}
  end
  def extract_first_external_url_from_object(_), do: {:error, :no_content}
end