Required.py

"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from cfnlint.rules import CloudFormationLintRule
from cfnlint.rules import RuleMatch


class Required(CloudFormationLintRule):
    """Check if Outputs have required properties"""

    id = 'E6002'
    shortdesc = 'Outputs have required properties'
    description = 'Making sure the outputs have required properties'
    source_url = 'https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/outputs-section-structure.html'
    tags = ['outputs']

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

        outputs = cfn.template.get('Outputs', {})
        if outputs:
            for output_name, output_value in outputs.items():
                if isinstance(output_value, dict):
                    if 'Value' not in output_value:
                        message = 'Output {0} is missing property {1}'
                        matches.append(
                            RuleMatch(
                                ['Outputs', output_name, 'Value'],
                                message.format(output_name, 'Value'),
                            )
                        )

        return matches