Fix digest assets sprocket extension to work with ruby 3.2

Gemfile

@@ -6,8 +6,6 @@ gem "sprockets-rails"
 gem "jsbundling-rails"
 gem "terser"
 
-gem "non-stupid-digest-assets"
-
 gem "pg"
 
 gem "diff-lcs", require: ['diff-lcs', 'diff/lcs/array']

Gemfile.lock

@@ -123,8 +123,6 @@ GEM
     nokogiri (1.13.10)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    non-stupid-digest-assets (1.0.9)
-      sprockets (>= 2.0)
     pg (1.4.3)
     pry (0.14.1)
       coderay (~> 1.1)
@@ -212,7 +210,6 @@ DEPENDENCIES
   mini_mime
   newrelic_rpm
   nokogiri
-  non-stupid-digest-assets
   pg
   pry
   puma

config/initializers/non_digest_assets.rb

@@ -1 +1,4 @@
+require 'non_stupid_digest_assets'
+
 NonStupidDigestAssets.whitelist = ["404.html", "429.html", "500.html"]
+Sprockets::Manifest.send(:prepend, NonStupidDigestAssets::CompileWithNonDigest)

lib/non_stupid_digest_assets.rb

@@ -0,0 +1,53 @@
+# Taken from [1] with file existence check updated to work with ruby 3.2
+# by renaming `File.exists?` to `File.exist?`.
+#
+# [1] https://github.com/alexspeller/non-stupid-digest-assets/blob/cb899cc4bad242c9da7c0ef61d4f9e431e020119/lib/non-stupid-digest-assets.rb
+require "sprockets/manifest"
+
+module NonStupidDigestAssets
+  mattr_accessor :whitelist
+  @@whitelist = []
+
+  class << self
+    def assets(assets)
+      return assets if whitelist.empty?
+      whitelisted_assets(assets)
+    end
+
+    private
+
+    def whitelisted_assets(assets)
+      assets.select do |logical_path, digest_path|
+        whitelist.any? do |item|
+          item === logical_path
+        end
+      end
+    end
+  end
+
+  module CompileWithNonDigest
+    def compile *args
+      paths = super
+      NonStupidDigestAssets.assets(assets).each do |(logical_path, digest_path)|
+        full_digest_path = File.join dir, digest_path
+        full_digest_gz_path = "#{full_digest_path}.gz"
+        full_non_digest_path = File.join dir, logical_path
+        full_non_digest_gz_path = "#{full_non_digest_path}.gz"
+
+        if File.exist? full_digest_path
+          logger.debug "Writing #{full_non_digest_path}"
+          FileUtils.copy_file full_digest_path, full_non_digest_path, :preserve_attributes
+        else
+          logger.debug "Could not find: #{full_digest_path}"
+        end
+        if File.exist? full_digest_gz_path
+          logger.debug "Writing #{full_non_digest_gz_path}"
+          FileUtils.copy_file full_digest_gz_path, full_non_digest_gz_path, :preserve_attributes
+        else
+          logger.debug "Could not find: #{full_digest_gz_path}"
+        end
+      end
+      paths
+    end
+  end
+end