129 lines
3.3 KiB
Elixir
129 lines
3.3 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.HTML do
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# Scrubbers are compiled on boot so they can be configured in OTP releases
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# @on_load :compile_scrubbers
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@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
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def compile_scrubbers do
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dir = Path.join(:code.priv_dir(:pleroma), "scrubbers")
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dir
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|> Pleroma.Utils.compile_dir()
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|> case do
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{:error, _errors, _warnings} ->
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raise "Compiling scrubbers failed"
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{:ok, _modules, _warnings} ->
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:ok
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end
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end
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defp get_scrubbers(scrubber) when is_atom(scrubber), do: [scrubber]
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defp get_scrubbers(scrubbers) when is_list(scrubbers), do: scrubbers
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defp get_scrubbers(_), do: [Pleroma.HTML.Scrubber.Default]
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def get_scrubbers do
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Pleroma.Config.get([:markup, :scrub_policy])
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|> get_scrubbers
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end
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def filter_tags(html, nil) do
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filter_tags(html, get_scrubbers())
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end
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def filter_tags(html, scrubbers) when is_list(scrubbers) do
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Enum.reduce(scrubbers, html, fn scrubber, html ->
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filter_tags(html, scrubber)
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end)
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end
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def filter_tags(html, scrubber) do
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{:ok, content} = FastSanitize.Sanitizer.scrub(html, scrubber)
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content
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end
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def filter_tags(html), do: filter_tags(html, nil)
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def strip_tags(html), do: filter_tags(html, FastSanitize.Sanitizer.StripTags)
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def get_cached_scrubbed_html_for_activity(
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content,
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scrubbers,
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activity,
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key \\ "",
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callback \\ fn x -> x end
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) do
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key = "#{key}#{generate_scrubber_signature(scrubbers)}|#{activity.id}"
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@cachex.fetch!(:scrubber_cache, key, fn _key ->
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object = Pleroma.Object.normalize(activity, fetch: false)
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ensure_scrubbed_html(content, scrubbers, object.data["fake"] || false, callback)
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end)
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end
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def get_cached_stripped_html_for_activity(content, activity, key) do
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get_cached_scrubbed_html_for_activity(
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content,
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FastSanitize.Sanitizer.StripTags,
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activity,
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key,
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&HtmlEntities.decode/1
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)
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end
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def ensure_scrubbed_html(
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content,
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scrubbers,
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fake,
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callback
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) do
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content =
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content
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|> filter_tags(scrubbers)
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|> callback.()
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if fake do
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{:ignore, content}
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else
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{:commit, content}
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end
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end
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defp generate_scrubber_signature(scrubber) when is_atom(scrubber) do
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generate_scrubber_signature([scrubber])
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end
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defp generate_scrubber_signature(scrubbers) do
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Enum.reduce(scrubbers, "", fn scrubber, signature ->
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"#{signature}#{to_string(scrubber)}"
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end)
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end
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def extract_first_external_url_from_object(%{data: %{"content" => content}} = object)
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when is_binary(content) do
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unless object.data["fake"] do
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key = "URL|#{object.id}"
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@cachex.fetch!(:scrubber_cache, key, fn _key ->
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{:commit, {:ok, extract_first_external_url(content)}}
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end)
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else
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{:ok, extract_first_external_url(content)}
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end
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end
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def extract_first_external_url_from_object(_), do: {:error, :no_content}
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def extract_first_external_url(content) do
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content
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|> Floki.parse_fragment!()
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|> Floki.find("a:not(.mention,.hashtag,.attachment,[rel~=\"tag\"])")
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|> Enum.take(1)
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|> Floki.attribute("href")
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|> Enum.at(0)
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end
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end
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