Fix puppet classes import filter when using Ruby >=3.1 and Regexp/Symbol in YAML file

Co-authored-by: Ewoud Kohl van Wijngaarden <[email protected]>

Author: Romuald Conty

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2024-12-17 15:04:46 UTC using RuboCop version 1.23.0.
+# on 2024-12-17 15:06:35 UTC using RuboCop version 1.23.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -25,7 +25,7 @@ Metrics/BlockLength:
 # Offense count: 2
 # Configuration parameters: CountComments, CountAsOne.
 Metrics/ClassLength:
-  Max: 246
+  Max: 254
 
 # Offense count: 19
 # Configuration parameters: IgnoredMethods.

app/services/foreman_puppet/puppet_class_importer.rb

@@ -229,7 +229,17 @@ def ignored_file_path
     end
 
     def load_ignored_file
-      File.exist?(ignored_file_path) ? YAML.load_file(ignored_file_path) : {}
+      if File.exist?(ignored_file_path)
+        # Ruby 3+
+        if YAML.respond_to(:safe_load_file)
+          YAML.safe_load_file(ignored_file_path, permitted_classes: [Symbol, Regexp])
+        else
+          # NOTE: Once we drop Ruby 2.7 support, you can drop the load_file call.
+          YAML.load_file(ignored_file_path)
+        end
+      else
+        {}
+      end
     end
 
     def ignored_file