143 lines
4.0 KiB
Elixir
143 lines
4.0 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
|
||
@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
|