Fix maintenance for admin

Author: vtm9

services/app/apps/codebattle/lib/codebattle_web/plugs/maintainance_mode.ex

@@ -0,0 +1,31 @@
+defmodule CodebattleWeb.Plugs.MaintenanceMode do
+  @moduledoc false
+  use Gettext, backend: CodebattleWeb.Gettext
+
+  import Phoenix.Controller
+  import Plug.Conn
+
+  alias Codebattle.User
+
+  @spec init(Keyword.t()) :: Keyword.t()
+  def init(opts), do: opts
+
+  @spec call(Plug.Conn.t(), Keyword.t()) :: Plug.Conn.t()
+  def call(conn, _opts) do
+    cond do
+      User.admin?(conn.assigns.current_user) ->
+        conn
+
+      FunWithFlags.enabled?(:maintenance_mode) ->
+        conn
+        |> put_status(:service_unavailable)
+        |> put_layout({CodebattleWeb.LayoutView, "landing.html"})
+        |> put_view(CodebattleWeb.RootView)
+        |> render("maintenance.html")
+        |> halt()
+
+      :default ->
+        conn
+    end
+  end
+end

services/app/apps/codebattle/lib/codebattle_web/plugs/maintenance_mode.ex

@@ -28,8 +28,8 @@ defmodule CodebattleWeb.Router do
     plug(:fetch_session)
     plug(:fetch_flash)
     plug(:fetch_live_flash)
-    plug(MaintenanceMode)
     plug(AssignCurrentUser)
+    plug(MaintenanceMode)
     plug(ForceRedirect)
     plug(:protect_from_forgery)
     plug(:put_secure_browser_headers)