UniqueNames.py

"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""

from cfnlint.rules import CloudFormationLintRule, RuleMatch
from cfnlint.template import Template


class UniqueNames(CloudFormationLintRule):
    id = "E3007"
    shortdesc = "Unique resource and parameter names"
    description = "All resources and parameters must have unique names"
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resources-section-structure.html"
    tags = ["parameters", "resources"]

    def match(self, cfn: Template):
        matches = []
        for resource in cfn.get_resources():
            if resource in cfn.template.get("Parameters", {}):
                matches.append(
                    RuleMatch(
                        ["Resources", resource],
                        "Resources and Parameters must not share name: " + resource,
                    )
                )
        return matches