1 defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
4 alias Pleroma.Web.OAuth.Token
5 alias Pleroma.{User, Repo}
7 @behaviour :cowboy_websocket_handler
19 @anonymous_streams ["public", "public:local", "hashtag"]
21 # Handled by periodic keepalive in Pleroma.Web.Streamer.
24 def init(_type, _req, _opts) do
25 {:upgrade, :protocol, :cowboy_websocket}
28 def websocket_init(_type, req, _opts) do
29 with {qs, req} <- :cowboy_req.qs(req),
30 params <- :cow_qs.parse_qs(qs),
31 access_token <- List.keyfind(params, "access_token", 0),
32 {_, stream} <- List.keyfind(params, "stream", 0),
33 {:ok, user} <- allow_request(stream, access_token),
34 topic when is_binary(topic) <- expand_topic(stream, params) do
35 send(self(), :subscribe)
36 {:ok, req, %{user: user, topic: topic}, @timeout}
39 Logger.debug("#{__MODULE__} denied connection: #{inspect(code)} - #{inspect(req)}")
40 {:ok, req} = :cowboy_req.reply(code, req)
44 Logger.debug("#{__MODULE__} denied connection: #{inspect(error)} - #{inspect(req)}")
49 # We never receive messages.
50 def websocket_handle(_frame, req, state) do
54 def websocket_info(:subscribe, req, state) do
56 "#{__MODULE__} accepted websocket connection for user #{
57 (state.user || %{id: "anonymous"}).id
58 }, topic #{state.topic}"
61 Pleroma.Web.Streamer.add_socket(state.topic, streamer_socket(state))
65 def websocket_info({:text, message}, req, state) do
66 {:reply, {:text, message}, req, state}
69 def websocket_terminate(reason, _req, state) do
71 "#{__MODULE__} terminating websocket connection for user #{
72 (state.user || %{id: "anonymous"}).id
73 }, topic #{state.topic || "?"}: #{inspect(reason)}"
76 Pleroma.Web.Streamer.remove_socket(state.topic, streamer_socket(state))
80 # Public streams without authentication.
81 defp allow_request(stream, nil) when stream in @anonymous_streams do
85 # Authenticated streams.
86 defp allow_request(stream, {"access_token", access_token}) when stream in @streams do
87 with %Token{user_id: user_id} <- Repo.get_by(Token, token: access_token),
88 user = %User{} <- Repo.get(User, user_id) do
96 defp allow_request(stream, _) when stream in @streams, do: {:error, 403}
99 defp allow_request(_, _), do: {:error, 404}
101 defp expand_topic("hashtag", params) do
102 case List.keyfind(params, "tag", 0) do
103 {_, tag} -> "hashtag:#{tag}"
108 defp expand_topic("list", params) do
109 case List.keyfind(params, "list", 0) do
110 {_, list} -> "list:#{list}"
115 defp expand_topic(topic, _), do: topic
117 defp streamer_socket(state) do
118 %{transport_pid: self(), assigns: state}