e688d4ee69
Inspired by https://git.pleroma.social/moonman/emoji-stealer-mrf/-/blob/master/steal_emoji_policy.ex
97 lines
2.6 KiB
Elixir
97 lines
2.6 KiB
Elixir
# Pleroma: A lightweight social networking server
|
||
# Copyright © 2017-2020 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
|
||
|
||
defp remote_host?(host), do: host != Config.get([Pleroma.Web.Endpoint, :url, :host])
|
||
|
||
defp accept_host?(host), do: host in Config.get([:mrf_steal_emoji, :hosts], [])
|
||
|
||
defp steal_emoji({shortcode, url}) do
|
||
url = Pleroma.Web.MediaProxy.url(url)
|
||
{:ok, response} = Pleroma.HTTP.get(url)
|
||
size_limit = Config.get([:mrf_steal_emoji, :size_limit], 50_000)
|
||
|
||
if byte_size(response.body) <= size_limit do
|
||
emoji_dir_path =
|
||
Config.get(
|
||
[:mrf_steal_emoji, :path],
|
||
Path.join(Config.get([:instance, :static_dir]), "emoji/stolen")
|
||
)
|
||
|
||
extension =
|
||
url
|
||
|> URI.parse()
|
||
|> Map.get(:path)
|
||
|> Path.basename()
|
||
|> Path.extname()
|
||
|
||
file_path = Path.join([emoji_dir_path, shortcode <> (extension || ".png")])
|
||
|
||
try do
|
||
:ok = File.write(file_path, response.body)
|
||
|
||
shortcode
|
||
rescue
|
||
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
|
||
rescue
|
||
e ->
|
||
Logger.warn("MRF.StealEmojiPolicy: Failed to fetch #{url}: #{inspect(e)}")
|
||
nil
|
||
end
|
||
|
||
@impl true
|
||
def filter(%{"object" => %{"emoji" => foreign_emojis, "actor" => actor}} = message) do
|
||
host = URI.parse(actor).host
|
||
|
||
if remote_host?(host) and accept_host?(host) do
|
||
installed_emoji = Pleroma.Emoji.get_all() |> Enum.map(fn {k, _} -> k end)
|
||
|
||
new_emojis =
|
||
foreign_emojis
|
||
|> Enum.filter(fn {shortcode, _url} -> shortcode not in installed_emoji end)
|
||
|> Enum.filter(fn {shortcode, _url} ->
|
||
reject_emoji? =
|
||
Config.get([:mrf_steal_emoji, :rejected_shortcodes], [])
|
||
|> Enum.find(false, fn regex -> String.match?(shortcode, regex) end)
|
||
|
||
!reject_emoji?
|
||
end)
|
||
|> Enum.map(&steal_emoji(&1))
|
||
|> 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
|