feat: port basic functionality to elixir

lib/components_elixir_web/plugs/auth_plug.ex

@@ -0,0 +1,22 @@
+defmodule ComponentsElixirWeb.AuthPlug do
+  @moduledoc """
+  Plug for handling authentication.
+  """
+
+  import Plug.Conn
+  import Phoenix.Controller
+
+  alias ComponentsElixir.Auth
+
+  def init(opts), do: opts
+
+  def call(conn, _opts) do
+    if Auth.authenticated?(conn) do
+      conn
+    else
+      conn
+      |> redirect(to: "/login")
+      |> halt()
+    end
+  end
+end