Editor: Allow file retrieval after code run

app/controllers/concerns/file_conversion.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+module FileConversion
+  private
+
+  def convert_files_json_to_files(files_json)
+    all_file_types = FileType.all
+    directories = []
+    files = files_json['files'].filter_map do |file|
+      # entryType: `-` describes a regular file, `d` a directory. See `info ls` for others
+      directories.push(file['name']) if file['entryType'] == 'd'
+      next unless file['entryType'] == '-'
+
+      extension = File.extname(file['name'])
+      name = File.basename(file['name'], extension)
+      path = File.dirname(file['name']).sub(%r{^(?>\./|\.)}, '').presence
+      file_type = all_file_types.detect {|ft| ft.file_extension == extension } || FileType.new(file_extension: extension)
+      CodeOcean::File.new(
+        name: name,
+        path: path,
+        size: file['size'],
+        owner: file['owner'],
+        group: file['group'],
+        permissions: file['permissions'],
+        updated_at: file['modificationTime'],
+        file_type: file_type
+      )
+    end
+    [augment_files_for_download(files), directories]
+  end
+
+  def augment_files_for_download(files)
+    raise NotImplementedError
+  end
+end