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diff --git a/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex b/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex
index c28f14a41..fbe9795ac 100644
--- a/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/steal_emoji_policy.ex
@@ -1,99 +1,144 @@
# 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.StealEmojiPolicy do
require Logger
alias Pleroma.Config
@moduledoc "Detect new emojis by their shortcode and steals them"
@behaviour Pleroma.Web.ActivityPub.MRF.Policy
defp accept_host?(host), do: host in Config.get([:mrf_steal_emoji, :hosts], [])
defp steal_emoji({shortcode, url}, emoji_dir_path) do
url = Pleroma.Web.MediaProxy.url(url)
with {:ok, %{status: status} = response} when status in 200..299 <- Pleroma.HTTP.get(url) do
size_limit = Config.get([:mrf_steal_emoji, :size_limit], 50_000)
if byte_size(response.body) <= size_limit do
extension =
url
|> URI.parse()
|> Map.get(:path)
|> Path.basename()
|> Path.extname()
file_path = Path.join(emoji_dir_path, shortcode <> (extension || ".png"))
case File.write(file_path, response.body) do
:ok ->
shortcode
e ->
Logger.warn("MRF.StealEmojiPolicy: Failed to write to #{file_path}: #{inspect(e)}")
nil
end
else
Logger.debug(
"MRF.StealEmojiPolicy: :#{shortcode}: at #{url} (#{byte_size(response.body)} B) over size limit (#{
size_limit
} B)"
)
nil
end
else
e ->
Logger.warn("MRF.StealEmojiPolicy: Failed to fetch #{url}: #{inspect(e)}")
nil
end
end
@impl true
def filter(%{"object" => %{"emoji" => foreign_emojis, "actor" => actor}} = message) do
host = URI.parse(actor).host
if host != Pleroma.Web.Endpoint.host() and accept_host?(host) do
installed_emoji = Pleroma.Emoji.get_all() |> Enum.map(fn {k, _} -> k end)
emoji_dir_path =
Config.get(
[:mrf_steal_emoji, :path],
Path.join(Config.get([:instance, :static_dir]), "emoji/stolen")
)
File.mkdir_p(emoji_dir_path)
new_emojis =
foreign_emojis
|> Enum.reject(fn {shortcode, _url} -> shortcode in installed_emoji end)
|> Enum.filter(fn {shortcode, _url} ->
reject_emoji? =
[:mrf_steal_emoji, :rejected_shortcodes]
|> Config.get([])
|> Enum.find(false, fn regex -> String.match?(shortcode, regex) end)
!reject_emoji?
end)
|> Enum.map(&steal_emoji(&1, emoji_dir_path))
|> Enum.filter(& &1)
if !Enum.empty?(new_emojis) do
Logger.info("Stole new emojis: #{inspect(new_emojis)}")
Pleroma.Emoji.reload()
end
end
{:ok, message}
end
def filter(message), do: {:ok, message}
+ @impl true
+ @spec config_description :: %{
+ children: [
+ %{
+ description: <<_::272, _::_*256>>,
+ key: :hosts | :rejected_shortcodes | :size_limit,
+ suggestions: [any(), ...],
+ type: {:list, :string} | {:list, :string} | :integer
+ },
+ ...
+ ],
+ description: <<_::448>>,
+ key: :mrf_steal_emoji,
+ label: <<_::80>>,
+ related_policy: <<_::352>>
+ }
+ def config_description do
+ %{
+ key: :mrf_steal_emoji,
+ related_policy: "Pleroma.Web.ActivityPub.MRF.StealEmojiPolicy",
+ label: "MRF Emojis",
+ description: "Steals emojis from selected instances when it sees them.",
+ children: [
+ %{
+ key: :hosts,
+ type: {:list, :string},
+ description: "List of hosts to steal emojis from",
+ suggestions: [""]
+ },
+ %{
+ key: :rejected_shortcodes,
+ type: {:list, :string},
+ description: "Regex-list of shortcodes to reject",
+ suggestions: [""]
+ },
+ %{
+ key: :size_limit,
+ type: :integer,
+ description: "File size limit (in bytes), checked before an emoji is saved to the disk",
+ suggestions: ["100000"]
+ }
+ ]
+ }
+ end
+
@impl true
def describe do
{:ok, %{}}
end
end

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