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"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from cfnlint.rules import CloudFormationLintRule, RuleMatch


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-python-lint"
    tags = ["mappings"]

    def match(self, cfn):
        matches = []
        findinmap_mappings = []

        mappings = cfn.template.get("Mappings", {})

        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

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
ApproachingLimitAttributes.py File 1.51 KB 0644
ApproachingLimitName.py File 697 B 0644
ApproachingLimitNumber.py File 685 B 0644
Configuration.py File 2.24 KB 0644
KeyName.py File 2.58 KB 0644
LimitAttributes.py File 1.44 KB 0644
LimitName.py File 699 B 0644
LimitNumber.py File 687 B 0644
Name.py File 644 B 0644
Used.py File 1.72 KB 0644
__init__.py File 106 B 0644