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ServerlessTransform.py
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ServerlessTransform.py
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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 ServerlessTransform(CloudFormationLintRule):
"""Check if Serverless Resources exist without the Serverless Transform"""
id = "E3038"
shortdesc = "Check if Serverless Resources have Serverless Transform"
description = "Check that a template with Serverless Resources also includes the Serverless Transform"
source_url = "https://github.com/aws-cloudformation/cfn-python-lint"
tags = ["resources", "transform"]
def match(self, cfn):
matches = []
transforms = cfn.template.get("Transform", [])
if not isinstance(transforms, list):
transforms = [transforms]
has_serverless_transform = any(
transform == "AWS::Serverless-2016-10-31" for transform in transforms
)
if has_serverless_transform:
return matches
for resource_name, resource_values in cfn.get_resources().items():
resource_type = resource_values["Type"]
if isinstance(resource_type, str):
if resource_type.startswith("AWS::Serverless::"):
message = (
"Serverless Transform required for Type {0} for resource {1}"
)
matches.append(
RuleMatch(
["Transform"], message.format(resource_type, resource_name)
)
)
break
return matches