Refactor user certificate validation to use standardized error responses

from ..models.problem_details import ProblemDetails

from ..util import serialize_clean_camel_case

from .resources import Resource

from .responses import internal_server_error

from .responses import forbidden_error, internal_server_error, unauthorized_error

class ControlAccess(Resource):

            cert_entry = cert_col.find_one(my_query)

            if cert_entry is None:

                prob = ProblemDetails(title="Unauthorized", detail="User not authorized", cause="Certificate not found for invoker")

                prob = serialize_clean_camel_case(prob)

                return Response(json.dumps(prob, cls=CustomJSONEncoder), status=401, mimetype="application/json")

                return unauthorized_error(detail="Please provide an existing Network App ID", cause="Certificate not found for invoker")

            if cert_entry["cert_signature"] != cert_signature:

                prob = ProblemDetails(title="Forbidden", detail="User not authorized", cause="You are not the owner of this resource")

                prob = serialize_clean_camel_case(prob)

                return Response(json.dumps(prob, cls=CustomJSONEncoder), status=403, mimetype="application/json")

                return forbidden_error(detail="User not authorized", cause="You are not the owner of this resource")

        except Exception as e:

            exception = "An exception occurred in validate invoker"