Add initializer for active storage CDN (not working rn)

config/initializers/active_storage_cdn.rb

@@ -0,0 +1,38 @@
+# I had to override also public_url
+# https://www.digitalocean.com/community/tutorials/how-to-use-activestorage-in-rails-6-with-digitalocean-spaces#step-3-configuring-the-spaces-cdn-optional
+
+if ENV["ACTIVE_STORAGE_CDN_HOST"]
+  Rails.application.config.after_initialize do
+    require "active_storage/service/s3_service"
+
+    module SimpleCDNUrlReplacement
+      def url(...)
+        url = super
+        original_host = client.client.config.endpoint.host
+
+        print "Replacing #{original_host} with #{ENV["ACTIVE_STORAGE_CDN_HOST"]} in #{url} ..."
+
+        new_url = url.gsub(original_host, ENV["ACTIVE_STORAGE_CDN_HOST"])
+
+        print "New URL: #{new_url}\n"
+
+        new_url
+      end
+
+      def public_url(...)
+        url = super
+        original_host = client.client.config.endpoint.host
+
+        print "Replacing #{original_host} with #{ENV["ACTIVE_STORAGE_CDN_HOST"]} in #{url} ..."
+
+        new_url = url.gsub(original_host, ENV["ACTIVE_STORAGE_CDN_HOST"])
+
+        print "New URL: #{new_url}\n"
+
+        new_url
+      end
+    end
+
+    ActiveStorage::Service::S3Service.prepend(SimpleCDNUrlReplacement)
+  end
+end