diff --git a/Gemfile b/Gemfile
index 7b4d6d7..ab52866 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,7 @@ gemspec
 
 gem "rake", "~> 13.0"
 gem "rackup"
+gem "rubytree"
 
 gem "rspec", "~> 3.0"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4aad841..994f7a3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -53,6 +53,8 @@ GEM
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     ruby-progressbar (1.13.0)
+    rubytree (2.0.2)
+      json (~> 2.0, > 2.3.1)
     standard (1.30.1)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.0)
@@ -75,6 +77,7 @@ DEPENDENCIES
   rackup
   rake (~> 13.0)
   rspec (~> 3.0)
+  rubytree
   skeksis!
   standard (~> 1.3)
 
diff --git a/config.ru b/config.ru
index 9c47a40..3d1575d 100644
--- a/config.ru
+++ b/config.ru
@@ -1,4 +1,5 @@
 require 'skeksis'
+require 'rubytree'
 
 class SkeksisApp
   def initialize
diff --git a/lib/skeksis.rb b/lib/skeksis.rb
index b8b46e0..8d85155 100644
--- a/lib/skeksis.rb
+++ b/lib/skeksis.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "yaml"
+require "tree"
 
 require_relative "skeksis/version"
 require_relative "skeksis/parser"
@@ -39,9 +40,44 @@ module Skeksis
       config = YAML.load(File.read("config.yml"))
       @gemini_uri = config['skeksis_config']['gemini_uri']
       @serve_dir = config['skeksis_config']['serve_dir']
+      @allowlist = Tree::TreeNode.new("ROOT", false)
+
+      build_allowlist(@allowlist, @serve_dir)
+
+      puts @allowlist.to_h
+    end
+
+    def build_allowlist(tree, path)
+      Dir.each_child(path) do |child|
+        full_path = Pathname.new(path).join(child)
+
+        if child == ".serve_ok"
+          tree.content = true
+        end
+
+        serve_ok = false
+        if Dir.exist?(full_path)
+          Dir.each_child(full_path) do |subchild|
+            if subchild == ".serve_ok"
+              serve_ok = true
+            end
+          end
+
+          child_node = Tree::TreeNode.new(child, serve_ok)
+          tree << child_node
+        end
+      end
     end
 
     def query(path, env)
+      query_path = Pathname.new(path).each_filename.to_a
+
+      @allowlist.children do |child|
+        if child.name == query_path[0] and child.content == false
+          return nil
+        end
+      end
+
       # Chomps the first / and builds path
       full_path = Pathname.new(@serve_dir) + path[1..-1] 
       puts full_path.to_s
@@ -83,12 +119,19 @@ module Skeksis
       end
       
       listing = Dir.each_child(path).map do |i|
-        if i == ".directory-listing-ok"
+        if i == ".directory-listing-ok" or i == ".serve_ok"
           next
         end
 
-        path = Pathname.new(env['PATH_INFO']).join(i)
-        uri = URI::HTTP.build(host: http.host, port: http.port, path: path.to_s)
+        child_path = Pathname.new(path).join(i)
+        puts child_path
+
+        if Dir.exist?(child_path) and not Dir.each_child(child_path).include?('.serve_ok')
+          next
+        end
+
+        uri_path = Pathname.new(env['PATH_INFO']).join(i)
+        uri = URI::HTTP.build(host: http.host, port: http.port, path: uri_path.to_s)
         "<a href=\"#{uri.to_s}\">#{i}</a><br>"
       end.join("\n")
       [Header + listing + Footer]