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Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from __future__ import unicode_literals
from cfnlint._typing import RuleMatches
from cfnlint.rules import CloudFormationLintRule, RuleMatch
from cfnlint.template import Template
class Used(CloudFormationLintRule):
"""Check if Parameters are used"""
id = "W2001"
shortdesc = "Check if Parameters are Used"
description = "Making sure the parameters defined are used"
source_url = "https://github.com/aws-cloudformation/cfn-lint"
tags = ["parameters"]
def match(self, cfn: Template) -> RuleMatches:
if cfn.transform_pre["Transform"]:
return []
matches: RuleMatches = []
le_refs = None
if cfn.has_language_extensions_transform():
le_refs = cfn.search_deep_keys("Ref")
reftrees = cfn.transform_pre.get("Ref", [])
subtrees = cfn.transform_pre.get("Fn::Sub", [])
refs = []
for reftree in reftrees:
refs.append(reftree[-1])
if le_refs:
for le_ref in le_refs:
if le_ref[-1] not in refs:
refs.append(le_ref[-1])
subs = []
for subtree in subtrees:
if isinstance(subtree[-1], list):
subs.extend(cfn.get_sub_parameters(subtree[-1][0]))
elif isinstance(subtree[-1], str):
subs.extend(cfn.get_sub_parameters(subtree[-1]))
for paramname in cfn.template.get("Parameters", {}).keys():
if paramname not in refs:
if paramname not in subs:
message = "Parameter {0} not used."
matches.append(
RuleMatch(["Parameters", paramname], message.format(paramname))
)
return matches
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