Add support for validating objects with a to_dict method

src/kubernetes_validate/utils.py

@@ -6,7 +6,8 @@
 import re
 import sys
 from distutils.version import LooseVersion
-from typing import Any, Dict, Generator, List
+from typing import Any, Dict, Generator, List, Union
+from typing_extensions import Protocol
 
 import jsonschema
 import pkg_resources
@@ -15,6 +16,10 @@
 from kubernetes_validate.version import __version__
 
 
+class SupportsToDict(Protocol):
+    def to_dict(self) -> dict: ...  # noqa: E704
+
+
 class ValidationError(jsonschema.ValidationError):
     def __init__(self, caught: Exception, version: str):
         self.version = version
@@ -58,7 +63,12 @@ def latest_version() -> str:
     return all_versions()[-1]
 
 
-def validate(data: Dict[str, Any], desired_version: str, strict: bool = False) -> str:
+def validate(data: Union[Dict[str, Any], SupportsToDict], desired_version: str, strict: bool = False) -> str:
+    if not isinstance(data, dict):
+        try:
+            data = data.to_dict()
+        except AttributeError:
+            raise TypeError("data must be a dict or object with a to_dict() method")
     # strip initial v from version (I keep forgetting, so other people will too)
     if desired_version.startswith('v'):
         desired_version = desired_version[1:]

tests/test_validate_resources.py

@@ -43,3 +43,16 @@ def test_validate_version_too_new():
         assert False
     except utils.VersionNotSupportedError:
         assert True
+
+def test_validate_object_resource():
+    resources = utils.resources_from_file(os.path.join(parent, 'resource.yaml'))
+
+    class ResourceObject(object):
+        def __init__(self, resource):
+            self.resource = resource
+
+        def to_dict(self):
+            return self.resource
+
+    for version in VERSIONS:
+        utils.validate(ResourceObject(resources[0]), version, strict=False)