Switch Phoenix back to upstream

See <https://github.com/phoenixframework/phoenix/pull/6094>
for `:sec_websocket_protocol` -> `:sec_websocket_headers`

lib/pleroma/web.ex

@@ -30,7 +30,7 @@ defmodule Pleroma.Web do
 
   def controller do
     quote do
-      use Phoenix.Controller, namespace: Pleroma.Web
+      use Phoenix.Controller, formats: [json: "View", html: "View"]
 
       import Plug.Conn
 

lib/pleroma/web/endpoint.ex

@@ -14,7 +14,7 @@ defmodule Pleroma.Web.Endpoint do
     websocket: [
       path: "/",
       compress: false,
-      connect_info: [:sec_websocket_protocol],
+      connect_info: [:sec_websocket_headers],
       error_handler: {Pleroma.Web.MastodonAPI.WebsocketHandler, :handle_error, []},
       fullsweep_after: 20
     ]

lib/pleroma/web/mastodon_api/websocket_handler.ex

@@ -245,12 +245,14 @@ defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
     Plug.Conn.send_resp(conn, 404, "Not Found")
   end
 
-  defp find_access_token(%{
-         connect_info: %{sec_websocket_protocol: [token]}
-       }),
-       do: token
-
   defp find_access_token(%{params: %{"access_token" => token}}), do: token
 
+  defp find_access_token(%{connect_info: %{sec_websocket_headers: sec_headers}}),
+    do:
+      Enum.find_value(sec_headers, fn
+        {"sec-websocket-protocol", v} -> v
+        _ -> nil
+      end)
+
   defp find_access_token(_), do: nil
 end