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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 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
alias Pleroma.Web.StreamerView
@behaviour Phoenix.Socket.Transport
# Client ping period.
@tick :timer.seconds(30)
@impl Phoenix.Socket.Transport
def child_spec(_opts), do: :ignore
# This only prepares the connection and is not in the process yet
@impl Phoenix.Socket.Transport
def connect(%{params: params} = transport_info) do
with access_token <- Map.get(params, "access_token"),
{:ok, user, oauth_token} <- authenticate_request(access_token),
{:ok, topic} <-
Streamer.get_topic(params["stream"], user, oauth_token, params) do
topics =
if topic do
[topic]
else
[]
end
state = %{
user: user,
topics: topics,
oauth_token: oauth_token,
count: 0,
timer: nil
}
{:ok, state}
else
{:error, :bad_topic} ->
Logger.debug("#{__MODULE__} bad topic #{inspect(transport_info)}")
{:error, :bad_topic}
{:error, :unauthorized} ->
Logger.debug("#{__MODULE__} authentication error: #{inspect(transport_info)}")
{:error, :unauthorized}
end
end
# All subscriptions/links and messages cannot be created
# until the processed is launched with init/1
@impl Phoenix.Socket.Transport
def init(state) do
Enum.each(state.topics, fn topic -> Streamer.add_socket(topic, state.oauth_token) end)
Process.send_after(self(), :ping, @tick)
{:ok, state}
end
@impl Phoenix.Socket.Transport
def handle_in({text, [opcode: :text]}, state) do
with {:ok, %{} = event} <- Jason.decode(text) do
handle_client_event(event, state)
else
_ ->
Logger.error("#{__MODULE__} received non-JSON event: #{inspect(text)}")
{:ok, state}
end
end
def handle_in(frame, state) do
Logger.error("#{__MODULE__} received frame: #{inspect(frame)}")
{:ok, state}
end
@impl Phoenix.Socket.Transport
def handle_info({:render_with_user, view, template, item, topic}, state) do
user = %User{} = User.get_cached_by_ap_id(state.user.ap_id)
unless Streamer.filtered_by_user?(user, item) do
message = view.render(template, item, user, topic)
{:push, {:text, message}, %{state | user: user}}
else
{:ok, state}
end
end
def handle_info({:text, text}, state) do
{:push, {:text, text}, state}
end
def handle_info(:ping, state) do
Process.send_after(self(), :ping, @tick)
{:push, {:ping, ""}, state}
end
def handle_info(:close, state) do
{:stop, {:closed, 'connection closed by server'}, state}
end
def handle_info(msg, state) do
Logger.debug("#{__MODULE__} received info: #{inspect(msg)}")
{:ok, state}
end
@impl Phoenix.Socket.Transport
def terminate(reason, state) do
Logger.debug(
"#{__MODULE__} terminating websocket connection for user #{(state.user || %{id: "anonymous"}).id}, topics #{state.topics || "?"}: #{inspect(reason)})"
)
Enum.each(state.topics, fn topic -> Streamer.remove_socket(topic) end)
:ok
end
# Public streams without authentication.
defp authenticate_request(nil) do
{:ok, nil, nil}
end
# Authenticated streams.
defp authenticate_request(access_token) do
with oauth_token = %Token{user_id: user_id} <- Repo.get_by(Token, token: access_token),
user = %User{} <- User.get_cached_by_id(user_id) do
{:ok, user, oauth_token}
else
_ -> {:error, :unauthorized}
end
end
defp handle_client_event(%{"type" => "subscribe", "stream" => _topic} = params, state) do
with {_, {:ok, topic}} <-
{:topic, Streamer.get_topic(params["stream"], state.user, state.oauth_token, params)},
{_, false} <- {:subscribed, topic in state.topics} do
Streamer.add_socket(topic, state.oauth_token)
message =
StreamerView.render("pleroma_respond.json", %{type: "subscribe", result: "success"})
{:reply, :ok, {:text, message}, %{state | topics: [topic | state.topics]}}
else
{:subscribed, true} ->
message =
StreamerView.render("pleroma_respond.json", %{type: "subscribe", result: "ignored"})
{:reply, :error, {:text, message}, state}
{:topic, {:error, error}} ->
message =
StreamerView.render("pleroma_respond.json", %{
type: "subscribe",
result: "error",
error: error
})
{:reply, :error, {:text, message}, state}
end
end
defp handle_client_event(%{"type" => "unsubscribe", "stream" => _topic} = params, state) do
with {_, {:ok, topic}} <-
{:topic, Streamer.get_topic(params["stream"], state.user, state.oauth_token, params)},
{_, true} <- {:subscribed, topic in state.topics} do
Streamer.remove_socket(topic)
message =
StreamerView.render("pleroma_respond.json", %{type: "unsubscribe", result: "success"})
{:reply, :ok, {:text, message}, %{state | topics: List.delete(state.topics, topic)}}
else
{:subscribed, false} ->
message =
StreamerView.render("pleroma_respond.json", %{type: "unsubscribe", result: "ignored"})
{:reply, :error, {:text, message}, state}
{:topic, {:error, error}} ->
message =
StreamerView.render("pleroma_respond.json", %{
type: "unsubscribe",
result: "error",
error: error
})
{:reply, :error, {:text, message}, state}
end
end
defp handle_client_event(
%{"type" => "pleroma:authenticate", "token" => access_token} = _params,
state
) do
with {:auth, nil, nil} <- {:auth, state.user, state.oauth_token},
{:ok, user, oauth_token} <- authenticate_request(access_token) do
message =
StreamerView.render("pleroma_respond.json", %{
type: "pleroma:authenticate",
result: "success"
})
{:reply, :ok, {:text, message}, %{state | user: user, oauth_token: oauth_token}}
else
{:auth, _, _} ->
message =
StreamerView.render("pleroma_respond.json", %{
type: "pleroma:authenticate",
result: "error",
error: :already_authenticated
})
{:reply, :error, {:text, message}, state}
_ ->
message =
StreamerView.render("pleroma_respond.json", %{
type: "pleroma:authenticate",
result: "error",
error: :unauthorized
})
{:reply, :error, {:text, message}, state}
end
end
defp handle_client_event(params, state) do
Logger.error("#{__MODULE__} received unknown event: #{inspect(params)}")
{:ok, state}
end
def handle_error(conn, :unauthorized) do
Plug.Conn.send_resp(conn, 401, "Unauthorized")
end
def handle_error(conn, _reason) do
Plug.Conn.send_resp(conn, 404, "Not Found")
end
end
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