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Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from collections import deque
from typing import Any
import regex as re
from cfnlint.helpers import REGEX_SUB_PARAMETERS
from cfnlint.jsonschema import ValidationError, ValidationResult, Validator
from cfnlint.rules import CloudFormationLintRule
class SubParametersUsed(CloudFormationLintRule):
"""Check if Sub Parameters are used"""
id = "W1019"
shortdesc = "Validate that parameters to a Fn::Sub are used"
description = "Validate that Fn::Sub Parameters are used"
source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-sub.html"
tags = ["functions", "sub"]
def validate(
self, validator: Validator, s: Any, instance: Any, schema: Any
) -> ValidationResult:
if validator.is_type(instance, "string"):
return
variables = re.findall(REGEX_SUB_PARAMETERS, instance[0])
for v, _ in instance[1].items():
if v not in variables:
yield ValidationError(
f"Parameter {v!r} not used in 'Fn::Sub'", path=deque([1, v])
)
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