Verified Commit 77b5154c authored by href's avatar href
Browse files

Cowboy handler for Mastodon WebSocket

parent 5dcb7aec
......@@ -50,6 +50,15 @@
# Configures the endpoint
config :pleroma, Pleroma.Web.Endpoint,
url: [host: "localhost"],
http: [
dispatch: [
{:_,
[
{"/api/v1/streaming", Elixir.Pleroma.Web.MastodonAPI.WebsocketHandler, []},
{:_, Plug.Adapters.Cowboy.Handler, {Pleroma.Web.Endpoint, []}}
]}
]
],
protocol: "https",
secret_key_base: "aK4Abxf29xU9TTDKre9coZPUgevcVCFQJe/5xP/7Lt4BEif6idBIbjupVbOrbKxl",
signing_salt: "CqaoopA2",
......
......@@ -3,8 +3,6 @@ defmodule Pleroma.Web.Endpoint do
socket("/socket", Pleroma.Web.UserSocket)
socket("/api/v1", Pleroma.Web.MastodonAPI.MastodonSocket, websocket: [path: "/streaming"])
# Serve at "/" the static files from "priv/static" directory.
#
# You should set gzip to true if you are running phoenix.digest
......
defmodule Pleroma.Web.MastodonAPI.MastodonSocket do
use Phoenix.Socket
alias Pleroma.Web.OAuth.Token
alias Pleroma.{User, Repo}
@spec connect(params :: map(), Phoenix.Socket.t()) :: {:ok, Phoenix.Socket.t()} | :error
def connect(%{"access_token" => token} = params, socket) do
with %Token{user_id: user_id} <- Repo.get_by(Token, token: token),
%User{} = user <- Repo.get(User, user_id),
stream
when stream in [
"public",
"public:local",
"public:media",
"public:local:media",
"user",
"direct",
"list",
"hashtag"
] <- params["stream"] do
topic =
case stream do
"hashtag" -> "hashtag:#{params["tag"]}"
"list" -> "list:#{params["list"]}"
_ -> stream
end
socket =
socket
|> assign(:topic, topic)
|> assign(:user, user)
Pleroma.Web.Streamer.add_socket(topic, socket)
{:ok, socket}
else
_e -> :error
end
end
def connect(%{"stream" => stream} = params, socket)
when stream in ["public", "public:local", "hashtag"] do
topic =
case stream do
"hashtag" -> "hashtag:#{params["tag"]}"
_ -> stream
end
socket =
socket
|> assign(:topic, topic)
Pleroma.Web.Streamer.add_socket(topic, socket)
{:ok, socket}
end
def connect(_params, _socket), do: :error
def id(_), do: nil
def handle(:text, message, _state) do
# | :ok
# | state
# | {:text, message}
# | {:text, message, state}
# | {:close, "Goodbye!"}
{:text, message}
end
def handle(:closed, _, %{socket: socket}) do
topic = socket.assigns[:topic]
Pleroma.Web.Streamer.remove_socket(topic, socket)
end
end
defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
require Logger
alias Pleroma.Web.OAuth.Token
alias Pleroma.{User, Repo}
@behaviour :cowboy_websocket_handler
@streams [
"public",
"public:local",
"public:media",
"public:local:media",
"user",
"direct",
"list",
"hashtag"
]
@anonymous_streams ["public", "public:local", "hashtag"]
# Handled by periodic keepalive in Pleroma.Web.Streamer.
@timeout :infinity
def init(_type, _req, _opts) do
{:upgrade, :protocol, :cowboy_websocket}
end
def websocket_init(_type, req, _opts) do
with {qs, req} <- :cowboy_req.qs(req),
params <- :cow_qs.parse_qs(qs),
access_token <- List.keyfind(params, "access_token", 0),
{_, stream} <- List.keyfind(params, "stream", 0),
{:ok, user} <- allow_request(stream, access_token),
topic when is_binary(topic) <- expand_topic(stream, params) do
send(self(), :subscribe)
{:ok, req, %{user: user, topic: topic}, @timeout}
else
{:error, code} ->
Logger.debug("#{__MODULE__} denied connection: #{inspect(code)} - #{inspect(req)}")
{:ok, req} = :cowboy_req.reply(code, req)
{:shutdown, req}
error ->
Logger.debug("#{__MODULE__} denied connection: #{inspect(error)} - #{inspect(req)}")
{:shutdown, req}
end
end
# We never receive messages.
def websocket_handle(_frame, req, state) do
{:ok, req, state}
end
def websocket_info(:subscribe, req, state) do
Logger.debug(
"#{__MODULE__} accepted websocket connection for user #{
(state.user || %{id: "anonymous"}).id
}, topic #{state.topic}"
)
Pleroma.Web.Streamer.add_socket(state.topic, streamer_socket(state))
{:ok, req, state}
end
def websocket_info({:text, message}, req, state) do
{:reply, {:text, message}, req, state}
end
def websocket_terminate(reason, _req, state) do
Logger.debug(
"#{__MODULE__} terminating websocket connection for user #{
(state.user || %{id: "anonymous"}).id
}, topic #{state.topic || "?"}: #{inspect(reason)}"
)
Pleroma.Web.Streamer.remove_socket(state.topic, streamer_socket(state))
:ok
end
# Public streams without authentication.
defp allow_request(stream, nil) when stream in @anonymous_streams do
{:ok, nil}
end
# Authenticated streams.
defp allow_request(stream, {"access_token", access_token}) when stream in @streams do
with %Token{user_id: user_id} <- Repo.get_by(Token, token: access_token),
user = %User{} <- Repo.get(User, user_id) do
{:ok, user}
else
_ -> {:error, 403}
end
end
# Not authenticated.
defp allow_request(stream, _) when stream in @streams, do: {:error, 403}
# No matching stream.
defp allow_request(_, _), do: {:error, 404}
defp expand_topic("hashtag", params) do
case List.keyfind(params, "tag", 0) do
{_, tag} -> "hashtag:#{tag}"
_ -> nil
end
end
defp expand_topic("list", params) do
case List.keyfind(params, "list", 0) do
{_, list} -> "list:#{list}"
_ -> nil
end
end
defp expand_topic(topic, _), do: topic
defp streamer_socket(state) do
%{transport_pid: self(), assigns: state}
end
end
......@@ -4,17 +4,9 @@ defmodule Pleroma.Web.Streamer do
alias Pleroma.{User, Notification, Activity, Object, Repo}
alias Pleroma.Web.ActivityPub.ActivityPub
def init(args) do
{:ok, args}
end
@keepalive_interval :timer.seconds(30)
def start_link do
spawn(fn ->
# 30 seconds
Process.sleep(1000 * 30)
GenServer.cast(__MODULE__, %{action: :ping})
end)
GenServer.start_link(__MODULE__, %{}, name: __MODULE__)
end
......@@ -30,6 +22,16 @@ def stream(topic, item) do
GenServer.cast(__MODULE__, %{action: :stream, topic: topic, item: item})
end
def init(args) do
spawn(fn ->
# 30 seconds
Process.sleep(@keepalive_interval)
GenServer.cast(__MODULE__, %{action: :ping})
end)
{:ok, args}
end
def handle_cast(%{action: :ping}, topics) do
Map.values(topics)
|> List.flatten()
......@@ -40,7 +42,7 @@ def handle_cast(%{action: :ping}, topics) do
spawn(fn ->
# 30 seconds
Process.sleep(1000 * 30)
Process.sleep(@keepalive_interval)
GenServer.cast(__MODULE__, %{action: :ping})
end)
......
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