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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.Relay do
alias Pleroma.Activity
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.CommonAPI
require Logger
@nickname "relay"
@spec ap_id() :: String.t()
def ap_id, do: "#{Pleroma.Web.Endpoint.url()}/#{@nickname}"
@spec get_actor() :: User.t() | nil
def get_actor, do: User.get_or_create_service_actor_by_ap_id(ap_id(), @nickname)
@spec follow(String.t()) :: {:ok, Activity.t()} | {:error, any()}
def follow(target_instance) do
with %User{} = local_user <- get_actor(),
{:ok, %User{} = target_user} <- User.get_or_fetch_by_ap_id(target_instance),
{:ok, _, _, activity} <- CommonAPI.follow(local_user, target_user) do
Logger.info("relay: followed instance: #{target_instance}; id=#{activity.data["id"]}")
{:ok, activity}
else
error -> format_error(error)
end
end
@spec unfollow(String.t(), map()) :: {:ok, Activity.t()} | {:error, any()}
def unfollow(target_instance, opts \\ %{}) do
with %User{} = local_user <- get_actor(),
{:ok, target_user} <- fetch_target_user(target_instance, opts),
{:ok, activity} <- ActivityPub.unfollow(local_user, target_user) do
case target_user.id do
nil -> User.update_following_count(local_user)
_ -> User.unfollow(local_user, target_user)
end
Logger.info("relay: unfollowed instance: #{target_instance}: id=#{activity.data["id"]}")
{:ok, activity}
else
error -> format_error(error)
end
end
defp fetch_target_user(ap_id, opts) do
case {opts[:force], User.get_or_fetch_by_ap_id(ap_id)} do
{_, {:ok, %User{} = user}} -> {:ok, user}
{true, _} -> {:ok, %User{ap_id: ap_id}}
{_, error} -> error
end
end
@spec publish(any()) :: {:ok, Activity.t()} | {:error, any()}
def publish(%Activity{data: %{"type" => "Create"}} = activity) do
with %User{} = user <- get_actor(),
true <- Visibility.public?(activity) do
CommonAPI.repeat(activity.id, user)
else
error -> format_error(error)
end
end
def publish(_), do: {:error, "Not implemented"}
@spec list() :: {:ok, [%{actor: String.t(), followed_back: boolean()}]} | {:error, any()}
def list do
with %User{} = user <- get_actor() do
accepted =
user
|> following()
|> Enum.map(fn actor -> %{actor: actor, followed_back: true} end)
without_accept =
user
|> Pleroma.Activity.following_requests_for_actor()
|> Enum.map(fn activity -> %{actor: activity.data["object"], followed_back: false} end)
|> Enum.uniq()
{:ok, accepted ++ without_accept}
else
error -> format_error(error)
end
end
@spec following() :: [String.t()]
def following do
get_actor()
|> following()
end
defp following(user) do
user
|> User.following_ap_ids()
|> Enum.uniq()
end
defp format_error({:error, error}), do: format_error(error)
defp format_error(error) do
Logger.error("error: #{inspect(error)}")
{:error, error}
end
end

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