[Bug]: Raises `DeprecationWarning` for deprecated parameters that were not provided

[andersk]

Actual Behavior

If I write an OpenAPI document that specifies a parameter foo that’s deprecated: true, and use it to validate a request that does not include that parameter, openapi-core still raises DeprecationWarning: foo parameter is deprecated for no reason.

Expected Behavior

No DeprecationWarning should be raised.

I don’t think DeprecationWarning is appropriate at all here, as a DeprecationWarning is one that’s “intended for other Python developers” and not for users of a network API. But at the least, it’s obviously inappropriate when the parameter being warned about was not even provided.

Steps to Reproduce

Run with python -Werror (or in another way that enables warnings, such as development mode):

from openapi_core import OpenAPI
from openapi_core.testing import MockRequest

spec = OpenAPI.from_dict(
    {
        "openapi": "3.1.0",
        "info": {"version": "0", "title": "test"},
        "paths": {
            "/test": {
                "get": {
                    "parameters": [
                        {
                            "name": "foo",
                            "in": "query",
                            "schema": {},
                            "deprecated": True,
                        },
                    ],
                },
            },
        },
    }
)
spec.validate_request(MockRequest("http://localhost", "get", "/test"))

Traceback (most recent call last):
  File "/home/anders/python/openapi-core/deprecated_test.py", line 24, in <module>
    spec.validate_request(MockRequest("http://localhost", "get", "/test"))
  File "/home/anders/python/openapi-core/openapi_core/app.py", line 360, in validate_request
    self.validate_apicall_request(request)
  File "/home/anders/python/openapi-core/openapi_core/app.py", line 373, in validate_apicall_request
    self.request_validator.validate(request)
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 286, in validate
    for err in self.iter_errors(request):
               ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 349, in iter_errors
    yield from self._iter_errors(request, operation, path)
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 115, in _iter_errors
    self._get_parameters(request.parameters, operation, path)
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 172, in _get_parameters
    value = self._get_parameter(parameters, param)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/anders/python/openapi-core/openapi_core/validation/decorators.py", line 31, in wrapper
    return f(*args, **kwds)
           ^^^^^^^^^^^^^^^^
  File "/home/anders/python/openapi-core/openapi_core/validation/request/validators.py", line 199, in _get_parameter
    warnings.warn(
DeprecationWarning: foo parameter is deprecated

OpenAPI Core Version

0.19.4

OpenAPI Core Integration

none

Affected Area(s)

No response

References

validation

Anything else we need to know?

No response

Would you like to implement a fix?

None