pleroma/lib/pleroma/html.ex
Alex Gleason 3ff9c5e2a6
Break out activity-specific HTML functions into Pleroma.Activity.HTML
Fixes cycles in lib/pleroma/ecto_type/activity_pub/object_validators/safe_text.ex
2021-05-29 12:29:11 -05:00

94 lines
2.4 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 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
@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
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
def extract_first_external_url_from_object(%{data: %{"content" => content}} = object)
when is_binary(content) do
unless object.data["fake"] do
key = "URL|#{object.id}"
@cachex.fetch!(:scrubber_cache, key, fn _key ->
{:commit, {:ok, extract_first_external_url(content)}}
end)
else
{:ok, extract_first_external_url(content)}
end
end
def extract_first_external_url_from_object(_), do: {:error, :no_content}
def extract_first_external_url(content) do
content
|> Floki.parse_fragment!()
|> Floki.find("a:not(.mention,.hashtag,.attachment,[rel~=\"tag\"])")
|> Enum.take(1)
|> Floki.attribute("href")
|> Enum.at(0)
end
end