[FR] Add required-fields option to import-rules (#3546)

CLI.md

@@ -81,9 +81,10 @@ and will accept any valid rule in the following formats:
 ```console
 Usage: detection_rules import-rules [OPTIONS] [INPUT_FILE]...
 
-  Import rules from json, toml, or Kibana exported rule file(s).
+  Import rules from json, toml, yaml, or Kibana exported rule file(s).
 
 Options:
+  --required-only            Only prompt for required fields
   -d, --directory DIRECTORY  Load files from a directory
   -h, --help                 Show this message and exit.
 ```

detection_rules/main.py

@@ -94,8 +94,9 @@ def generate_rules_index(ctx: click.Context, query, overwrite, save_files=True):
 
 @root.command('import-rules')
 @click.argument('input-file', type=click.Path(dir_okay=False, exists=True), nargs=-1, required=False)
+@click.option('--required-only', is_flag=True, help='Only prompt for required fields')
 @click.option('--directory', '-d', type=click.Path(file_okay=False, exists=True), help='Load files from a directory')
-def import_rules(input_file, directory):
+def import_rules(input_file, required_only, directory):
     """Import rules from json, toml, yaml, or Kibana exported rule file(s)."""
     rule_files = glob.glob(os.path.join(directory, '**', '*.*'), recursive=True) if directory else []
     rule_files = sorted(set(rule_files + list(input_file)))
@@ -115,7 +116,8 @@ def import_rules(input_file, directory):
         base_path = name_to_filename(base_path) if base_path else base_path
         rule_path = os.path.join(RULES_DIR, base_path) if base_path else None
         additional = ['index'] if not contents.get('data_view_id') else ['data_view_id']
-        rule_prompt(rule_path, required_only=True, save=True, verbose=True, additional_required=additional, **contents)
+        rule_prompt(rule_path, required_only=required_only, save=True, verbose=True,
+                    additional_required=additional, **contents)
 
 
 @root.command('build-limited-rules')