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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.OutgoingHandler do
use GenServer
require Logger
alias Pleroma.Application
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, %{protocols: [:http]}),
{:ok, _} <- :gun.await_up(conn_pid),
reference <-
:gun.get(conn_pid, to_charlist(path), [
{'user-agent', to_charlist(Application.user_agent())}
]),
{: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)},
{'user-agent', to_charlist(Application.user_agent())}
]
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
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