144 lines
3.8 KiB
Elixir
144 lines
3.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
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require Logger
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alias Pleroma.Repo
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alias Pleroma.User
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alias Pleroma.Web.OAuth.Token
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alias Pleroma.Web.Streamer
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@behaviour :cowboy_websocket
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@streams [
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"public",
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"public:local",
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"public:media",
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"public:local:media",
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"user",
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"user:notification",
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"direct",
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"list",
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"hashtag"
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]
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@anonymous_streams ["public", "public:local", "hashtag"]
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# Handled by periodic keepalive in Pleroma.Web.Streamer.Ping.
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@timeout :infinity
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def init(%{qs: qs} = req, state) do
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with params <- :cow_qs.parse_qs(qs),
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sec_websocket <- :cowboy_req.header("sec-websocket-protocol", req, nil),
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access_token <- List.keyfind(params, "access_token", 0),
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{_, stream} <- List.keyfind(params, "stream", 0),
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{:ok, user} <- allow_request(stream, [access_token, sec_websocket]),
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topic when is_binary(topic) <- expand_topic(stream, params) do
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req =
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if sec_websocket do
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:cowboy_req.set_resp_header("sec-websocket-protocol", sec_websocket, req)
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else
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req
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end
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{:cowboy_websocket, req, %{user: user, topic: topic}, %{idle_timeout: @timeout}}
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else
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{:error, code} ->
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Logger.debug("#{__MODULE__} denied connection: #{inspect(code)} - #{inspect(req)}")
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{:ok, req} = :cowboy_req.reply(code, req)
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{:ok, req, state}
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error ->
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Logger.debug("#{__MODULE__} denied connection: #{inspect(error)} - #{inspect(req)}")
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{:ok, req} = :cowboy_req.reply(400, req)
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{:ok, req, state}
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end
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end
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def websocket_init(state) do
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send(self(), :subscribe)
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{:ok, state}
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end
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# We never receive messages.
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def websocket_handle(_frame, state) do
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{:ok, state}
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end
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def websocket_info(:subscribe, state) do
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Logger.debug(
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"#{__MODULE__} accepted websocket connection for user #{
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(state.user || %{id: "anonymous"}).id
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}, topic #{state.topic}"
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)
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Streamer.add_socket(state.topic, streamer_socket(state))
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{:ok, state}
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end
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def websocket_info({:text, message}, state) do
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{:reply, {:text, message}, state}
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end
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def terminate(reason, _req, state) do
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Logger.debug(
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"#{__MODULE__} terminating websocket connection for user #{
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(state.user || %{id: "anonymous"}).id
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}, topic #{state.topic || "?"}: #{inspect(reason)}"
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)
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Streamer.remove_socket(state.topic, streamer_socket(state))
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:ok
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end
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# Public streams without authentication.
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defp allow_request(stream, [nil, nil]) when stream in @anonymous_streams do
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{:ok, nil}
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end
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# Authenticated streams.
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defp allow_request(stream, [access_token, sec_websocket]) when stream in @streams do
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token =
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with {"access_token", token} <- access_token do
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token
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else
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_ -> sec_websocket
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end
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with true <- is_bitstring(token),
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%Token{user_id: user_id} <- Repo.get_by(Token, token: token),
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user = %User{} <- User.get_cached_by_id(user_id) do
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{:ok, user}
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else
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_ -> {:error, 403}
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end
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end
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# Not authenticated.
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defp allow_request(stream, _) when stream in @streams, do: {:error, 403}
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# No matching stream.
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defp allow_request(_, _), do: {:error, 404}
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defp expand_topic("hashtag", params) do
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case List.keyfind(params, "tag", 0) do
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{_, tag} -> "hashtag:#{tag}"
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_ -> nil
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end
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end
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defp expand_topic("list", params) do
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case List.keyfind(params, "list", 0) do
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{_, list} -> "list:#{list}"
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_ -> nil
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end
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end
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defp expand_topic(topic, _), do: topic
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defp streamer_socket(state) do
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%{transport_pid: self(), assigns: state}
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end
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end
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