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Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from cfnlint._typing import RuleMatches
from cfnlint.rules import CloudFormationLintRule, RuleMatch
from cfnlint.template import Template
class Used(CloudFormationLintRule):
"""Check if Conditions are configured correctly"""
id = "W8001"
shortdesc = "Check if Conditions are Used"
description = "Making sure the conditions defined are used"
source_url = "https://github.com/aws-cloudformation/cfn-lint"
tags = ["conditions"]
def match(self, cfn: Template) -> RuleMatches:
matches = []
ref_conditions = []
conditions = cfn.template.get("Conditions", {})
if conditions:
# Get all "If's" that reference a Condition
iftrees = cfn.search_deep_keys("Fn::If")
for iftree in iftrees:
if isinstance(iftree[-1], list):
ref_conditions.append(iftree[-1][0])
else:
ref_conditions.append(iftree[-1])
# Get conditions used by another condition
condtrees = cfn.search_deep_keys("Condition")
for condtree in condtrees:
if condtree[0] == "Conditions":
if isinstance(condtree[-1], (str)):
ref_conditions.append(condtree[-1])
# Get resource's Conditions
for _, resource_values in cfn.get_resources().items():
if "Condition" in resource_values:
ref_conditions.append(resource_values["Condition"])
# Get Output Conditions
for _, output_values in cfn.template.get("Outputs", {}).items():
if "Condition" in output_values:
ref_conditions.append(output_values["Condition"])
# Check if the confitions are used
for condname, _ in conditions.items():
if condname not in ref_conditions:
message = "Condition {0} not used"
matches.append(
RuleMatch(["Conditions", condname], message.format(condname))
)
return matches
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