Update the LiveUserAuth to check the User's role.

lib/decentralised_book_index_web/live_user_auth.ex

@@ -6,6 +6,8 @@ defmodule DecentralisedBookIndexWeb.LiveUserAuth do
   import Phoenix.Component
   use DecentralisedBookIndexWeb, :verified_routes
 
+  alias DecentralisedBookIndex.Accounts.Role
+
   def on_mount(:live_user_optional, _params, _session, socket) do
     if socket.assigns[:current_user] do
       {:cont, socket}
@@ -29,4 +31,34 @@ defmodule DecentralisedBookIndexWeb.LiveUserAuth do
       {:cont, assign(socket, :current_user, nil)}
     end
   end
+
+  def on_mount(:moderator_required, _params, _session, socket) do
+    current_user = socket.assigns[:current_user]
+
+    if current_user && Role.can_moderate?(current_user.role) do
+      {:cont, socket}
+    else
+      socket =
+        socket
+        |> Phoenix.LiveView.put_flash(:error, "Unauthorized!")
+        |> Phoenix.LiveView.redirect(to: ~p"/")
+
+      {:halt, socket}
+    end
+  end
+
+  def on_mount(:admin_required, _params, _session, socket) do
+    current_user = socket.assigns[:current_user]
+
+    if current_user && Role.can_administrate?(current_user.role) do
+      {:cont, socket}
+    else
+      socket =
+        socket
+        |> Phoenix.LiveView.put_flash(:error, "Unauthorized!")
+        |> Phoenix.LiveView.redirect(to: ~p"/")
+
+      {:halt, socket}
+    end
+  end
 end