fix(validator): handle built-in custom formats correctly (#498)

aws_lambda_powertools/utilities/validation/base.py

@@ -32,6 +32,7 @@ def validate_data_against_schema(data: Dict, schema: Dict, formats: Optional[Dic
         When JSON schema provided is invalid
     """
     try:
+        formats = formats or {}
         fastjsonschema.validate(definition=schema, data=data, formats=formats)
     except (TypeError, AttributeError, fastjsonschema.JsonSchemaDefinitionException) as e:
         raise InvalidSchemaFormatError(f"Schema received: {schema}, Formats: {formats}. Error: {e}")

tests/functional/validator/conftest.py

@@ -565,3 +565,24 @@ def eventbridge_schema_registry_cloudtrail_v2_s3():
         "x-amazon-events-detail-type": "AWS API Call via CloudTrail",
         "x-amazon-events-source": "aws.s3",
     }
+
+
+@pytest.fixture
+def schema_datetime_format():
+    return {
+        "$schema": "http://json-schema.org/draft-07/schema",
+        "$id": "http://example.com/example.json",
+        "type": "object",
+        "title": "Sample schema with string date-time format",
+        "description": "The root schema comprises the entire JSON document.",
+        "required": ["message"],
+        "properties": {
+            "message": {
+                "$id": "#/properties/message",
+                "type": "string",
+                "format": "date-time",
+                "title": "The message",
+                "examples": ["hello world"],
+            },
+        },
+    }

tests/functional/validator/test_validator.py

@@ -151,3 +151,12 @@ def _func_echo_decoder(self, value):
             envelope="powertools_json(data).payload",
             jmespath_options=jmespath_opts,
         )
+
+
+def test_validate_date_time_format(schema_datetime_format):
+    raw_event = {"message": "2021-06-29T14:46:06.804Z"}
+    validate(event=raw_event, schema=schema_datetime_format)
+
+    invalid_datetime = {"message": "2021-06-29T14"}
+    with pytest.raises(exceptions.SchemaValidationError, match="data.message must be date-time"):
+        validate(event=invalid_datetime, schema=schema_datetime_format)