Verify user on liveview mount

lib/real_estate_web.ex

@@ -48,6 +48,7 @@ defmodule RealEstateWeb do
         layout: {RealEstateWeb.LayoutView, "live.html"}
 
       unquote(view_helpers())
+      import RealEstateWeb.LiveHelpers
     end
   end
 

lib/real_estate_web/live/live_helpers.ex

@@ -0,0 +1,29 @@
+defmodule RealEstateWeb.LiveHelpers do
+  import Phoenix.LiveView
+  alias RealEstate.Accounts
+  alias RealEstate.Accounts.User
+  alias RealEstateWeb.Router.Helpers, as: Routes
+
+  def assign_defaults(session, socket) do
+    socket =
+      assign_new(socket, :current_user, fn ->
+        find_current_user(session)
+      end)
+
+    case socket.assigns.current_user do
+      %User{} ->
+        socket
+
+      _other ->
+        socket
+        |> put_flash(:error, "You must log in to access this page.")
+        |> redirect(to: Routes.user_session_path(socket, :new))
+    end
+  end
+
+  defp find_current_user(session) do
+    with user_token when not is_nil(user_token) <- session["user_token"],
+         %User{} = user <- Accounts.get_user_by_session_token(user_token),
+         do: user
+  end
+end

lib/real_estate_web/live/page_live.ex

@@ -2,7 +2,8 @@ defmodule RealEstateWeb.PageLive do
   use RealEstateWeb, :live_view
 
   @impl true
-  def mount(_params, _session, socket) do
+  def mount(_params, session, socket) do
+    socket = assign_defaults(session, socket)
     {:ok, assign(socket, query: "", results: %{})}
   end