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

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defmodule Pleroma.Web.ActivityPub.MRF.FollowBotPolicy do
@behaviour Pleroma.Web.ActivityPub.MRF
alias Pleroma.Activity.Queries
alias Pleroma.Config
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.CommonAPI
require Logger
import Ecto.Query
@impl true
def filter(message) do
with follower_nickname <- Config.get([:mrf_follow_bot, :follower_nickname]),
%User{actor_type: "Service"} = follower <-
User.get_cached_by_nickname(follower_nickname),
%{"type" => "Create", "object" => %{"type" => "Note"}} <- message do
try_follow(follower, message)
else
nil ->
Logger.warn(
"#{__MODULE__} skipped because of missing `:mrf_follow_bot, :follower_nickname` configuration, the :follower_nickname
account does not exist, or the account is not correctly configured as a bot."
)
{:ok, message}
_ ->
{:ok, message}
end
end
defp try_follow(follower, message) do
Task.start(fn ->
to = Map.get(message, "to", [])
cc = Map.get(message, "cc", [])
actor = [message["actor"]]
Enum.concat([to, cc, actor])
|> List.flatten()
|> Enum.uniq()
|> User.get_all_by_ap_id()
|> Enum.each(fn user ->
since_thirty_days_ago = NaiveDateTime.utc_now() |> NaiveDateTime.add(-(86_400 * 30))
with false <- User.following?(follower, user),
false <- User.locked?(user),
false <- (user.bio || "") |> String.downcase() |> String.contains?("nobot"),
false <- outstanding_follow_request_since?(follower, user, since_thirty_days_ago) do
Logger.info("#{__MODULE__}: Follow request from #{follower.nickname} to #{user.nickname}")
CommonAPI.follow(follower, user)
end
end)
end)
{:ok, message}
end
defp outstanding_follow_request_since?(
%User{ap_id: follower_id},
%User{ap_id: followee_id},
since_datetime
) do
followee_id
|> Queries.by_object_id()
|> Queries.by_type("Follow")
|> where([a], a.inserted_at > ^since_datetime)
|> where([a], fragment("? ->> 'state' = 'pending'", a.data))
|> where([a], a.actor == ^follower_id)
|> Repo.exists?()
end
@impl true
def describe do
{:ok, %{}}
end
end