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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.MastodonAPI.WebsocketHandler do
require Logger
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.OAuth.Token
alias Pleroma.Web.Streamer
@behaviour :cowboy_websocket
# Handled by periodic keepalive in Pleroma.Web.Streamer.Ping.
@timeout :infinity
def init(%{qs: qs} = req, state) do
with params <- Enum.into(:cow_qs.parse_qs(qs), %{}),
sec_websocket <- :cowboy_req.header("sec-websocket-protocol", req, nil),
access_token <- Map.get(params, "access_token"),
{:ok, user} <- authenticate_request(access_token, sec_websocket),
{:ok, topic} <- Streamer.get_topic(Map.get(params, "stream"), user, params) do
req =
if sec_websocket do
:cowboy_req.set_resp_header("sec-websocket-protocol", sec_websocket, req)
else
req
end
{:cowboy_websocket, req, %{user: user, topic: topic}, %{idle_timeout: @timeout}}
else
{:error, :bad_topic} ->
Logger.debug("#{__MODULE__} bad topic #{inspect(req)}")
{:ok, req} = :cowboy_req.reply(404, req)
{:ok, req, state}
{:error, :unauthorized} ->
Logger.debug("#{__MODULE__} authentication error: #{inspect(req)}")
{:ok, req} = :cowboy_req.reply(401, req)
{:ok, req, state}
end
end
def websocket_init(state) do
send(self(), :subscribe)
{:ok, state}
end
# We never receive messages.
def websocket_handle(_frame, state) do
{:ok, state}
end
def websocket_info(:subscribe, state) do
Logger.debug(
"#{__MODULE__} accepted websocket connection for user #{
(state.user || %{id: "anonymous"}).id
}, topic #{state.topic}"
)
Streamer.add_socket(state.topic, streamer_socket(state))
{:ok, state}
end
def websocket_info({:text, message}, state) do
{:reply, {:text, message}, state}
end
def terminate(reason, _req, state) do
Logger.debug(
"#{__MODULE__} terminating websocket connection for user #{
(state.user || %{id: "anonymous"}).id
}, topic #{state.topic || "?"}: #{inspect(reason)}"
)
Streamer.remove_socket(state.topic, streamer_socket(state))
:ok
end
# Public streams without authentication.
defp authenticate_request(nil, nil) do
{:ok, nil}
end
# Authenticated streams.
defp authenticate_request(access_token, sec_websocket) do
token = access_token || sec_websocket
with true <- is_bitstring(token),
%Token{user_id: user_id} <- Repo.get_by(Token, token: token),
user = %User{} <- User.get_cached_by_id(user_id) do
{:ok, user}
else
_ -> {:error, :unauthorized}
end
end
defp streamer_socket(state) do
%{transport_pid: self(), assigns: state}
end
end
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