mirror of
https://akkoma.dev/AkkomaGang/akkoma.git
synced 2024-12-11 21:44:57 +00:00
100 lines
2.8 KiB
Elixir
100 lines
2.8 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.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
|
||
def describe do
|
||
{:ok, %{}}
|
||
end
|
||
end
|