akkoma/lib/pleroma/web/activity_pub/mrf/inline_quote_policy.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.InlineQuotePolicy do
@moduledoc "Force a quote line into the message content."
@behaviour Pleroma.Web.ActivityPub.MRF.Policy
alias Pleroma.Object
defp build_inline_quote(prefix, url) do
"<span class=\"quote-inline\"><br/><br/>#{prefix}: <a href=\"#{url}\">#{url}</a></span>"
end
defp resolve_urls(quote_url) do
# Fetching here can cause infinite recursion as we run this logic on inbound objects too
# This is probably not a problem - its an exceptional corner case for a local user to quote
# a post which doesn't exist
with %Object{} = obj <- Object.normalize(quote_url, fetch: false) do
id = obj.data["id"]
url = Map.get(obj.data, "url", id)
{id, url, [id, url, quote_url]}
else
_ -> {quote_url, quote_url, [quote_url]}
end
end
defp has_inline_quote?(content, urls) do
cond do
# Does the quote URL exist in the content?
Enum.any?(urls, fn url -> content =~ url end) -> true
# Does the content already have a .quote-inline span?
content =~ "<span class=\"quote-inline\">" -> true
# No inline quote found
true -> false
end
end
defp filter_object(%{"quoteUri" => quote_url} = object) do
{id, preferred_url, all_urls} = resolve_urls(quote_url)
object = Map.put(object, "quoteUri", id)
content = object["content"] || ""
if has_inline_quote?(content, all_urls) do
object
else
prefix = Pleroma.Config.get([:mrf_inline_quote, :prefix])
content =
if String.ends_with?(content, "</p>") do
String.trim_trailing(content, "</p>") <>
build_inline_quote(prefix, preferred_url) <> "</p>"
else
content <> build_inline_quote(prefix, preferred_url)
end
Map.put(object, "content", content)
end
end
@impl true
def filter(%{"object" => %{"quoteUri" => _} = object} = activity) do
{:ok, Map.put(activity, "object", filter_object(object))}
end
@impl true
def filter(object), do: {:ok, object}
@impl true
def describe, do: {:ok, %{}}
@impl true
def config_description do
%{
key: :mrf_inline_quote,
related_policy: "Pleroma.Web.ActivityPub.MRF.InlineQuotePolicy",
label: "MRF Inline Quote",
description: "Force quote post URLs inline",
children: [
%{
key: :prefix,
type: :string,
description: "Prefix before the link",
suggestions: ["RE", "QT", "RT", "RN"]
}
]
}
end
end