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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 Config(CloudFormationLintRule):
    """Check if Metadata configuration is properly configured"""

    id = "E4002"
    shortdesc = "Validate the configuration of the Metadata section"
    description = "Validates that Metadata section is an object and has no null values"
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/metadata-section-structure.html"
    tags = ["metadata"]

    def _check_object(self, obj, path):
        results = []
        if isinstance(obj, (dict)):
            for k, v in obj.items():
                results.extend(self._check_object(v, path + [k]))
        if isinstance(obj, (list)):
            for i, v in enumerate(obj):
                results.extend(self._check_object(v, path + [i]))
        if obj is None:
            message = "Metadata value cannot be null"
            results.append(RuleMatch(path, message.format(message)))

        return results

    def match(self, cfn):
        """Check CloudFormation Metadata Interface Configuration"""

        matches = []

        metadata_obj = cfn.template.get("Metadata", {})
        if metadata_obj is None:
            message = "Metadata value has to be an object"
            matches.append(RuleMatch(["Metadata"], message.format(message)))

        if metadata_obj:
            if isinstance(metadata_obj, dict):
                matches.extend(self._check_object(metadata_obj, ["Metadata"]))

        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