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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.helpers import is_function
from cfnlint.rules import CloudFormationLintRule, RuleMatch
from cfnlint.template import Template
class Used(CloudFormationLintRule):
"""Check if Mappings are used anywhere in the template"""
id = "W7001"
shortdesc = "Check if Mappings are Used"
description = "Making sure the mappings defined are used"
source_url = "https://github.com/aws-cloudformation/cfn-lint"
tags = ["mappings"]
def match(self, cfn: Template) -> RuleMatches:
matches: RuleMatches = []
findinmap_mappings = []
mappings = cfn.template.get("Mappings", {})
k, _ = is_function(mappings)
if k == "Fn::Transform":
self.logger.debug(
(f"Mapping Name has a transform. Disabling check {self.id!r}"),
)
return matches
if mappings:
# Get all "FindInMaps" that reference a Mapping
maptrees = cfn.transform_pre["Fn::FindInMap"]
for maptree in maptrees:
if isinstance(maptree[-1], list):
map_name = maptree[-1][0]
if isinstance(map_name, dict):
self.logger.debug(
(
"Mapping Name has a function that can have too many"
" variations. Disabling check %s"
),
self.id,
)
return matches
findinmap_mappings.append(maptree[-1][0])
else:
findinmap_mappings.append(maptree[-1])
# Check if the mappings are used
for mapname, _ in mappings.items():
if mapname not in findinmap_mappings:
message = "Mapping '{0}' is defined but not used"
matches.append(
RuleMatch(["Mappings", mapname], message.format(mapname))
)
return matches
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