diff options
Diffstat (limited to 'lib/pleroma/web/fed_sockets/outgoing_handler.ex')
-rw-r--r-- | lib/pleroma/web/fed_sockets/outgoing_handler.ex | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/lib/pleroma/web/fed_sockets/outgoing_handler.ex b/lib/pleroma/web/fed_sockets/outgoing_handler.ex new file mode 100644 index 000000000..6ddef17fe --- /dev/null +++ b/lib/pleroma/web/fed_sockets/outgoing_handler.ex @@ -0,0 +1,146 @@ +# 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.OutgoingHandler do + use GenServer + + require Logger + + alias Pleroma.Web.ActivityPub.InternalFetchActor + alias Pleroma.Web.FedSockets + alias Pleroma.Web.FedSockets.FedRegistry + alias Pleroma.Web.FedSockets.FedSocket + alias Pleroma.Web.FedSockets.SocketInfo + + def start_link(uri) do + GenServer.start_link(__MODULE__, %{uri: uri}) + end + + def init(%{uri: uri}) do + case initiate_connection(uri) do + {:ok, ws_origin, conn_pid} -> + FedRegistry.add_fed_socket(ws_origin, conn_pid) + + {:error, reason} -> + Logger.debug("Outgoing connection failed - #{inspect(reason)}") + :ignore + end + end + + def handle_info({:gun_ws, conn_pid, _ref, {:text, data}}, socket_info) do + socket_info = SocketInfo.touch(socket_info) + + case FedSocket.receive_package(socket_info, data) do + {:noreply, _} -> + {:noreply, socket_info} + + {:reply, reply} -> + :gun.ws_send(conn_pid, {:text, Jason.encode!(reply)}) + {:noreply, socket_info} + + {:error, reason} -> + Logger.error("incoming error - receive_package: #{inspect(reason)}") + {:noreply, socket_info} + end + end + + def handle_info(:close, state) do + Logger.debug("Sending close frame !!!!!!!") + {:close, state} + end + + def handle_info({:gun_down, _pid, _prot, :closed, _}, state) do + {:stop, :normal, state} + end + + def handle_info({:send, data}, %{conn_pid: conn_pid} = socket_info) do + socket_info = SocketInfo.touch(socket_info) + :gun.ws_send(conn_pid, {:text, data}) + {:noreply, socket_info} + end + + def handle_info({:gun_ws, _, _, :pong}, state) do + {:noreply, state, :hibernate} + end + + def handle_info(msg, state) do + Logger.debug("#{__MODULE__} unhandled event #{inspect(msg)}") + {:noreply, state} + end + + def terminate(reason, state) do + Logger.debug( + "#{__MODULE__} terminating outgoing connection for #{inspect(state)} for #{inspect(reason)}" + ) + + {:ok, state} + end + + def initiate_connection(uri) do + ws_uri = + uri + |> SocketInfo.origin() + |> FedSockets.uri_for_origin() + + %{host: host, port: port, path: path} = URI.parse(ws_uri) + + with {:ok, conn_pid} <- :gun.open(to_charlist(host), port), + {:ok, _} <- :gun.await_up(conn_pid), + reference <- :gun.get(conn_pid, to_charlist(path)), + {:response, :fin, 204, _} <- :gun.await(conn_pid, reference), + headers <- build_headers(uri), + ref <- :gun.ws_upgrade(conn_pid, to_charlist(path), headers, %{silence_pings: false}) do + receive do + {:gun_upgrade, ^conn_pid, ^ref, [<<"websocket">>], _} -> + {:ok, ws_uri, conn_pid} + after + 15_000 -> + Logger.debug("Fedsocket timeout connecting to #{inspect(uri)}") + {:error, :timeout} + end + else + {:response, :nofin, 404, _} -> + {:error, :fedsockets_not_supported} + + e -> + Logger.debug("Fedsocket error connecting to #{inspect(uri)}") + {:error, e} + end + end + + defp build_headers(uri) do + host_for_sig = uri |> URI.parse() |> host_signature() + + shake = FedSocket.shake() + digest = "SHA-256=" <> (:crypto.hash(:sha256, shake) |> Base.encode64()) + date = Pleroma.Signature.signed_date() + shake_size = byte_size(shake) + + signature_opts = %{ + "(request-target)": shake, + "content-length": to_charlist("#{shake_size}"), + date: date, + digest: digest, + host: host_for_sig + } + + signature = Pleroma.Signature.sign(InternalFetchActor.get_actor(), signature_opts) + + [ + {'signature', to_charlist(signature)}, + {'date', date}, + {'digest', to_charlist(digest)}, + {'content-length', to_charlist("#{shake_size}")}, + {to_charlist("(request-target)"), to_charlist(shake)} + ] + end + + defp host_signature(%{host: host, scheme: scheme, port: port}) do + if port == URI.default_port(scheme) do + host + else + "#{host}:#{port}" + end + end +end |