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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 InterfaceParameterExists(CloudFormationLintRule):
    """Check if Metadata Interface parameters exist"""

    id = "W4001"
    shortdesc = "Metadata Interface parameters exist"
    description = "Metadata Interface parameters actually exist"
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudformation-interface.html"
    tags = ["metadata"]

    valid_keys = ["ParameterGroups", "ParameterLabels"]

    def match(self, cfn):
        """Check CloudFormation Metadata Parameters Exist"""

        matches = []

        strinterface = "AWS::CloudFormation::Interface"
        parameters = cfn.get_parameter_names()
        metadata_obj = cfn.template.get("Metadata", {})
        if metadata_obj:
            interfaces = metadata_obj.get(strinterface, {})
            if isinstance(interfaces, dict):
                # Check Parameter Group Parameters
                paramgroups = interfaces.get("ParameterGroups", [])
                if isinstance(paramgroups, list):
                    for index, value in enumerate(paramgroups):
                        if "Parameters" in value:
                            for paramindex, paramvalue in enumerate(
                                value["Parameters"]
                            ):
                                if paramvalue not in parameters:
                                    message = (
                                        "Metadata Interface parameter doesn't exist {0}"
                                    )
                                    matches.append(
                                        RuleMatch(
                                            [
                                                "Metadata",
                                                strinterface,
                                                "ParameterGroups",
                                                index,
                                                "Parameters",
                                                paramindex,
                                            ],
                                            message.format(paramvalue),
                                        )
                                    )
                paramlabels = interfaces.get("ParameterLabels", {})
                if isinstance(paramlabels, dict):
                    for param in paramlabels:
                        if param not in parameters:
                            message = "Metadata Interface parameter doesn't exist {0}"
                            matches.append(
                                RuleMatch(
                                    [
                                        "Metadata",
                                        strinterface,
                                        "ParameterLabels",
                                        param,
                                    ],
                                    message.format(param),
                                )
                            )

        return matches

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
Config.py File 1.58 KB 0644
InterfaceConfiguration.py File 2.3 KB 0644
InterfaceParameterExists.py File 3.16 KB 0644
__init__.py File 106 B 0644