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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 FindInMapKeys(CloudFormationLintRule):
    """Check if FindInMap values are correct"""

    id = "W1011"
    shortdesc = "FindInMap keys exist in the map"
    description = (
        "Checks the keys in a FindInMap to make sure they exist. "
        "Check only if the Map Name is a string and if the key is a string."
    )
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-findinmap.html"
    tags = ["functions", "findinmap"]

    def check_keys(self, map_name, keys, mappings, tree):
        """Check the validity of the first key"""
        matches = []
        first_key = keys[0]
        second_key = keys[1]
        if isinstance(second_key, (str, int)):
            if isinstance(map_name, (str)):
                mapping = mappings.get(map_name)
                if mapping:
                    if isinstance(first_key, (str, int)):
                        if isinstance(map_name, (str)):
                            if mapping.get(first_key) is None:
                                message = 'FindInMap first key "{0}" doesn\'t exist in map "{1}" at {3}'
                                matches.append(
                                    RuleMatch(
                                        tree[:] + [1],
                                        message.format(
                                            first_key,
                                            map_name,
                                            first_key,
                                            "/".join(map(str, tree)),
                                        ),
                                    )
                                )
                        if mapping.get(first_key):
                            # Don't double error if they first key doesn't exist
                            if mapping.get(first_key, {}).get(second_key) is None:
                                message = 'FindInMap second key "{0}" doesn\'t exist in map "{1}" under "{2}" at {3}'
                                matches.append(
                                    RuleMatch(
                                        tree[:] + [2],
                                        message.format(
                                            second_key,
                                            map_name,
                                            first_key,
                                            "/".join(map(str, tree)),
                                        ),
                                    )
                                )
                    else:
                        for key, value in mapping.items():
                            if value.get(second_key) is None:
                                message = 'FindInMap second key "{0}" doesn\'t exist in map "{1}" under "{2}" at {3}'
                                matches.append(
                                    RuleMatch(
                                        tree[:] + [2],
                                        message.format(
                                            second_key,
                                            map_name,
                                            key,
                                            "/".join(map(str, tree)),
                                        ),
                                    )
                                )

        return matches

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

        findinmaps = cfn.search_deep_keys("Fn::FindInMap")
        mappings = cfn.get_mappings()
        for findinmap in findinmaps:
            tree = findinmap[:-1]
            map_obj = findinmap[-1]

            if len(map_obj) == 3:
                matches.extend(self.check_keys(map_obj[0], map_obj[1:], mappings, tree))

        return matches

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
Base64.py File 1.72 KB 0644
Cidr.py File 11.94 KB 0644
DynamicReferenceSecureString.py File 5.72 KB 0644
FindInMap.py File 11.25 KB 0644
FindInMapKeys.py File 3.89 KB 0644
GetAtt.py File 6.05 KB 0644
GetAz.py File 2.76 KB 0644
If.py File 1.45 KB 0644
ImportValue.py File 2.45 KB 0644
Join.py File 8.63 KB 0644
Length.py File 3.31 KB 0644
Not.py File 978 B 0644
Ref.py File 1.02 KB 0644
RefExist.py File 1.26 KB 0644
RefInCondition.py File 1.36 KB 0644
RelationshipConditions.py File 5.35 KB 0644
Select.py File 4.41 KB 0644
Split.py File 3.11 KB 0644
Sub.py File 9.49 KB 0644
SubNeeded.py File 5.48 KB 0644
SubNotJoin.py File 2 KB 0644
SubParametersUsed.py File 1.4 KB 0644
SubUnneeded.py File 1.27 KB 0644
ToJsonString.py File 1.75 KB 0644
__init__.py File 106 B 0644