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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 GetAz(CloudFormationLintRule):
    """Check if GetAz values are correct"""

    id = "E1015"
    shortdesc = "GetAz validation of parameters"
    description = "Making sure the GetAz function is properly configured"
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-getavailabilityzones.html"
    tags = ["functions", "getaz"]

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

        getaz_objs = cfn.search_deep_keys("Fn::GetAZs")

        for getaz_obj in getaz_objs:
            getaz_value = getaz_obj[-1]
            if isinstance(getaz_value, str):
                if getaz_value != "" and getaz_value not in cfn.regions:
                    message = (
                        "GetAZs should be of empty or string of valid region for {0}"
                    )
                    matches.append(
                        RuleMatch(
                            getaz_obj[:-1],
                            message.format("/".join(map(str, getaz_obj[:-1]))),
                        )
                    )
            elif isinstance(getaz_value, dict):
                if len(getaz_value) == 1:
                    if isinstance(getaz_value, dict):
                        for key, value in getaz_value.items():
                            if key != "Ref" or value != "AWS::Region":
                                message = (
                                    "GetAZs should be of Ref to AWS::Region for {0}"
                                )
                                matches.append(
                                    RuleMatch(
                                        getaz_obj[:-1],
                                        message.format(
                                            "/".join(map(str, getaz_obj[:-1]))
                                        ),
                                    )
                                )
                    else:
                        message = "GetAZs should be of Ref to AWS::Region for {0}"
                        matches.append(
                            RuleMatch(
                                getaz_obj[:-1],
                                message.format("/".join(map(str, getaz_obj[:-1]))),
                            )
                        )
                else:
                    message = "GetAZs should be of Ref to AWS::Region for {0}"
                    matches.append(
                        RuleMatch(
                            getaz_obj[:-1],
                            message.format("/".join(map(str, getaz_obj[:-1]))),
                        )
                    )
        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