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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.Federator.Publisher do
alias Pleroma.Activity
alias Pleroma.Config
alias Pleroma.User
alias Pleroma.Workers.PublisherWorker
require Logger
@moduledoc """
Defines the contract used by federation implementations to publish messages to
their peers.
"""
@doc """
Determine whether an activity can be relayed using the federation module.
"""
@callback is_representable?(Pleroma.Activity.t()) :: boolean()
@doc """
Relays an activity to a specified peer, determined by the parameters. The
parameters used are controlled by the federation module.
"""
@callback publish_one(Map.t()) :: {:ok, Map.t()} | {:error, any()}
@doc """
Enqueue publishing a single activity.
"""
@spec enqueue_one(module(), Map.t()) :: :ok
def enqueue_one(module, %{} = params) do
PublisherWorker.enqueue(
"publish_one",
%{"module" => to_string(module), "params" => params}
)
end
@doc """
Relays an activity to all specified peers.
"""
@callback publish(User.t(), Activity.t()) :: :ok | {:error, any()}
@spec publish(User.t(), Activity.t()) :: :ok
def publish(%User{} = user, %Activity{} = activity) do
Config.get([:instance, :federation_publisher_modules])
|> Enum.each(fn module ->
if module.is_representable?(activity) do
Logger.debug("Publishing #{activity.data["id"]} using #{inspect(module)}")
module.publish(user, activity)
end
end)
:ok
end
@doc """
Gathers links used by an outgoing federation module for WebFinger output.
"""
@callback gather_webfinger_links(User.t()) :: list()
@spec gather_webfinger_links(User.t()) :: list()
def gather_webfinger_links(%User{} = user) do
Config.get([:instance, :federation_publisher_modules])
|> Enum.reduce([], fn module, links ->
links ++ module.gather_webfinger_links(user)
end)
end
@doc """
Gathers nodeinfo protocol names supported by the federation module.
"""
@callback gather_nodeinfo_protocol_names() :: list()
@spec gather_nodeinfo_protocol_names() :: list()
def gather_nodeinfo_protocol_names do
Config.get([:instance, :federation_publisher_modules])
|> Enum.reduce([], fn module, links ->
links ++ module.gather_nodeinfo_protocol_names()
end)
end
@doc """
Gathers a set of remote users given an IR envelope.
"""
def remote_users(%User{id: user_id}, %{data: %{"to" => to} = data}) do
cc = Map.get(data, "cc", [])
bcc =
data
|> Map.get("bcc", [])
|> Enum.reduce([], fn ap_id, bcc ->
case Pleroma.List.get_by_ap_id(ap_id) do
%Pleroma.List{user_id: ^user_id} = list ->
{:ok, following} = Pleroma.List.get_following(list)
bcc ++ Enum.map(following, & &1.ap_id)
_ ->
bcc
end
end)
[to, cc, bcc]
|> Enum.concat()
|> Enum.map(&User.get_cached_by_ap_id/1)
|> Enum.filter(fn user -> user && !user.local end)
end
end
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