Prevent haxing of flags with devtools by renaming them

lib/flag_quiz/flags.ex

@@ -296,4 +296,9 @@ defmodule FlagQuiz.Flags do
   def get_all() do
     @flags
   end
+
+  def get_filename(code) do
+    lower = String.downcase(code)
+    :crypto.hash(:md5, lower) |> Base.encode16(case: :lower)
+  end
 end

lib/flag_quiz_web/live/page_live.ex

@@ -91,7 +91,7 @@ defmodule FlagQuizWeb.PageLive do
     Process.send_after(self(), :tick, 1_000)
 
     assign(socket,
-      flag_code: String.downcase(flag_code),
+      flag_code: FlagQuiz.Flags.get_filename(flag_code),
       flag_names: Enum.map(flag_names, &process_name/1),
       time: Application.get_env(:flag_quiz, :q_time),
       valid?: false,

lib/flag_quiz_web/live/page_live.html.leex

@@ -31,7 +31,8 @@
     <div id="counter"><%= @total - Enum.count(@quiz_set) %> / <%= @total %></div>
     <div
       id="flag"
-      class="flag-icon-background flag-icon-<%= @flag_code %> <%= if @valid?, do: "flag-valid" %> <%= if @failed?, do: "flag-failed" %>"
+      class="flag-icon-background <%= if @valid?, do: "flag-valid" %> <%= if @failed?, do: "flag-failed" %>"
+      style="background-image: url('<%= Routes.static_path(@socket, "/flags/4x3/#{@flag_code}.svg") %>');"
     ></div>
     <p id="timer">
       <%= if not @valid?, do: @time %>