from openapi_core import create_spec
from openapi_core.validation.request.datatypes import RequestParameters, OpenAPIRequest
from openapi_core.validation.request.validators import RequestValidator

spec_dict = {
    "openapi": "3.0.1",
    "info": {"title": "Test Spec", "version": "0.0.0"},
    "servers": [{"url": "http://localhost"}],
    "paths": {
        "/test": {
            "post": {
                "requestBody": {
                    "content": {
                        "application/json": {
                            "schema": {
                                "type": "object",
                                "properties": {
                                    "foo": {
                                        "type": "object",
                                        "nullable": True
                                    },
                                }
                            }
                        }
                    }
                },
                "responses": {"204": {"description": "Empty response."}}
            }
        }
    }
}

spec = create_spec(spec_dict)

request_body = '{"foo": null}'

request = OpenAPIRequest(
    full_url_pattern="http://localhost/test",
    method="post",
    parameters=RequestParameters(),
    body=request_body,
    mimetype="application/json",
)

result = RequestValidator(spec).validate(request)