git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/relay.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.Relay do
   6   alias Pleroma.Activity
   7   alias Pleroma.Object
   8   alias Pleroma.User
   9   alias Pleroma.Web.ActivityPub.ActivityPub
  10   require Logger
  11
  12   @relay_nickname "relay"
  13
  14   def get_actor do
  15     actor =
  16       relay_ap_id()
  17       |> User.get_or_create_service_actor_by_ap_id(@relay_nickname)
  18
  19     actor
  20   end
  21
  22   def relay_ap_id do
  23     "#{Pleroma.Web.Endpoint.url()}/relay"
  24   end
  25
  26   @spec follow(String.t()) :: {:ok, Activity.t()} | {:error, any()}
  27   def follow(target_instance) do
  28     with %User{} = local_user <- get_actor(),
  29          {:ok, %User{} = target_user} <- User.get_or_fetch_by_ap_id(target_instance),
  30          {:ok, activity} <- ActivityPub.follow(local_user, target_user) do
  31       Logger.info("relay: followed instance: #{target_instance}; id=#{activity.data["id"]}")
  32       {:ok, activity}
  33     else
  34       error -> format_error(error)
  35     end
  36   end
  37
  38   @spec unfollow(String.t()) :: {:ok, Activity.t()} | {:error, any()}
  39   def unfollow(target_instance) do
  40     with %User{} = local_user <- get_actor(),
  41          {:ok, %User{} = target_user} <- User.get_or_fetch_by_ap_id(target_instance),
  42          {:ok, activity} <- ActivityPub.unfollow(local_user, target_user) do
  43       User.unfollow(local_user, target_user)
  44       Logger.info("relay: unfollowed instance: #{target_instance}: id=#{activity.data["id"]}")
  45       {:ok, activity}
  46     else
  47       error -> format_error(error)
  48     end
  49   end
  50
  51   @spec publish(any()) :: {:ok, Activity.t(), Object.t()} | {:error, any()}
  52   def publish(%Activity{data: %{"type" => "Create"}} = activity) do
  53     with %User{} = user <- get_actor(),
  54          %Object{} = object <- Object.normalize(activity) do
  55       ActivityPub.announce(user, object, nil, true, false)
  56     else
  57       error -> format_error(error)
  58     end
  59   end
  60
  61   def publish(_), do: {:error, "Not implemented"}
  62
  63   @spec list() :: {:ok, [String.t()]} | {:error, any()}
  64   def list do
  65     with %User{} = user <- get_actor() do
  66       list =
  67         user
  68         |> User.following()
  69         |> Enum.map(fn entry -> URI.parse(entry).host end)
  70         |> Enum.uniq()
  71
  72       {:ok, list}
  73     else
  74       error -> format_error(error)
  75     end
  76   end
  77
  78   defp format_error({:error, error}), do: format_error(error)
  79
  80   defp format_error(error) do
  81     Logger.error("error: #{inspect(error)}")
  82     {:error, error}
  83   end
  84 end