manager: kresctl: 'validate' comd added

diff --git a/manager/knot_resolver_manager/cli/cmd/validate.py b/manager/knot_resolver_manager/cli/cmd/validate.py
new file mode 100644 (file)
index 0000000..e1457d2
--- /dev/null
+++ b/manager/knot_resolver_manager/cli/cmd/validate.py
@@ -0,0 +1,47 @@
+import argparse
+from typing import Dict, List, Optional, Tuple, Type
+
+from knot_resolver_manager.cli.command import Command, CommandArgs, register_command
+from knot_resolver_manager.datamodel import KresConfig
+from knot_resolver_manager.utils.modeling import try_to_parse
+from knot_resolver_manager.utils.modeling.exceptions import DataParsingError, DataValidationError
+
+
+@register_command
+class ValidateCommand(Command):
+    def __init__(self, namespace: argparse.Namespace, unknown_args: List[str]) -> None:
+        super().__init__(namespace, unknown_args)
+        self.input_file: str = namespace.input_file
+
+    @staticmethod
+    def register_args_subparser(
+        subparser: "argparse._SubParsersAction[argparse.ArgumentParser]",
+    ) -> Tuple[argparse.ArgumentParser, "Type[Command]"]:
+        validate = subparser.add_parser("validate", help="validate JSON/YAML configuration")
+        validate.add_argument(
+            "input_file",
+            type=str,
+            nargs="?",
+            help="JSON/YAML configuration input file",
+            default=None,
+        )
+
+        return validate, ValidateCommand
+
+    @staticmethod
+    def completion(args: List[str], parser: argparse.ArgumentParser) -> Dict[str, Optional[str]]:
+        return {}
+
+    def run(self, args: CommandArgs) -> None:
+
+        if self.input_file:
+            with open(self.input_file, "r") as f:
+                data = f.read()
+        else:
+            data = input("Type new configuration: ")
+
+        try:
+            KresConfig(try_to_parse(data))
+            print("config is valid")
+        except (DataParsingError, DataValidationError) as e:
+            print(e)