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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.FedSockets.FedSocket do
@moduledoc """
The FedSocket module abstracts the actions to be taken taken on connections regardless of
whether the connection started as inbound or outbound.
Normally outside modules will have no need to call the FedSocket module directly.
"""
alias Pleroma.Object
alias Pleroma.Object.Containment
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ObjectView
alias Pleroma.Web.ActivityPub.UserView
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.FedSockets.FetchRegistry
alias Pleroma.Web.FedSockets.IngesterWorker
alias Pleroma.Web.FedSockets.OutgoingHandler
alias Pleroma.Web.FedSockets.SocketInfo
require Logger
@shake "61dd18f7-f1e6-49a4-939a-a749fcdc1103"
def connect_to_host(uri) do
case OutgoingHandler.start_link(uri) do
{:ok, pid} ->
{:ok, pid}
error ->
{:error, error}
end
end
def close(%SocketInfo{pid: socket_pid}),
do: Process.send(socket_pid, :close, [])
def publish(%SocketInfo{pid: socket_pid}, json) do
%{action: :publish, data: json}
|> Jason.encode!()
|> send_packet(socket_pid)
end
def fetch(%SocketInfo{pid: socket_pid}, id) do
fetch_uuid = FetchRegistry.register_fetch(id)
%{action: :fetch, data: id, uuid: fetch_uuid}
|> Jason.encode!()
|> send_packet(socket_pid)
wait_for_fetch_to_return(fetch_uuid, 0)
end
def receive_package(%SocketInfo{} = fed_socket, json) do
json
|> Jason.decode!()
|> process_package(fed_socket)
end
defp wait_for_fetch_to_return(uuid, cntr) do
case FetchRegistry.check_fetch(uuid) do
{:error, :waiting} ->
Process.sleep(:math.pow(cntr, 3) |> Kernel.trunc())
wait_for_fetch_to_return(uuid, cntr + 1)
{:error, :missing} ->
Logger.error("FedSocket fetch timed out - #{inspect(uuid)}")
{:error, :timeout}
{:ok, _fr} ->
FetchRegistry.pop_fetch(uuid)
end
end
defp process_package(%{"action" => "publish", "data" => data}, %{origin: origin} = _fed_socket) do
if Containment.contain_origin(origin, data) do
IngesterWorker.enqueue("ingest", %{"object" => data})
end
{:reply, %{"action" => "publish_reply", "status" => "processed"}}
end
defp process_package(%{"action" => "fetch_reply", "uuid" => uuid, "data" => data}, _fed_socket) do
FetchRegistry.register_fetch_received(uuid, data)
{:noreply, nil}
end
defp process_package(%{"action" => "fetch", "uuid" => uuid, "data" => ap_id}, _fed_socket) do
{:ok, data} = render_fetched_data(ap_id, uuid)
{:reply, data}
end
defp process_package(%{"action" => "publish_reply"}, _fed_socket) do
{:noreply, nil}
end
defp process_package(other, _fed_socket) do
Logger.warn("unknown json packages received #{inspect(other)}")
{:noreply, nil}
end
defp render_fetched_data(ap_id, uuid) do
{:ok,
%{
"action" => "fetch_reply",
"status" => "processed",
"uuid" => uuid,
"data" => represent_item(ap_id)
}}
end
defp represent_item(ap_id) do
case User.get_by_ap_id(ap_id) do
nil ->
object = Object.get_cached_by_ap_id(ap_id)
if Visibility.is_public?(object) do
Phoenix.View.render_to_string(ObjectView, "object.json", object: object)
else
nil
end
user ->
Phoenix.View.render_to_string(UserView, "user.json", user: user)
end
end
defp send_packet(data, socket_pid) do
Process.send(socket_pid, {:send, data}, [])
end
def shake, do: @shake
end
|
