Add support for AWS::CDK::Metadata Resource

[jnsf-cg]

When attempting to Open a json or yaml file containing the contents outputted by the cdk synth command, an error is returned.

Package Version

v4.15.5

Example Code

	tpl, err := goformation.Open(filepath)
	if err != nil {
		return "", fmt.Errorf("Unable to Open CF Template [%w]", err)
	}

Example CF Template Content

Resources:
  AppLBListener908F43BE:
    Type: AWS::ElasticLoadBalancingV2::Listener
    Properties:
      DefaultActions:
        - FixedResponseConfig:
            ContentType: text/plain
            MessageBody: Hello, world.
            StatusCode: "200"
          Type: fixed-response
      Port: 443
      Protocol: HTTPS
      SslPolicy: ELBSecurityPolicy-FS-1-2-Res-2019-08
    Metadata:
      aws:cdk:path: Example1Stack/AppLB/Listener/Resource
  CDKMetadata:
    Type: AWS::CDK::Metadata
    Properties:
      Modules: aws-cdk=1.73.0,@aws-cdk/assets=1.73.0,@aws-cdk/aws-cloudwatch=1.73.0,@aws-cdk/aws-ec2=1.73.0,@aws-cdk/aws-elasticloadbalancingv2=1.73.0,@aws-cdk/aws-events=1.73.0,@aws-cdk/aws-iam=1.73.0,@aws-cdk/aws-kms=1.73.0,@aws-cdk/aws-logs=1.73.0,@aws-cdk/aws-s3=1.73.0,@aws-cdk/aws-s3-assets=1.73.0,@aws-cdk/aws-ssm=1.73.0,@aws-cdk/cloud-assembly-schema=1.73.0,@aws-cdk/core=1.73.0,@aws-cdk/cx-api=1.73.0,@aws-cdk/region-info=1.73.0,jsii-runtime=node.js/v15.2.0
    Metadata:
      aws:cdk:path: Example1Stack/CDKMetadata/Default

Expected

No error to be returned

Got

Received the following error:

json: Unmarshal(nil)

Note: If I remove the CDKMetadata resource, the Open(...) succeeds.

[SleepyBrett]

I've run into this as well. Being able to process the output of cdk synth would be nice.

Something that is working for me as a workaround is cdk synth --version-reporting false This causes synth to not output the CDKMetadata block.

Having a reasonable error message would also be super nice. I had to trace quite deep to figure out what was happening.

[ismferd]

Hi,

I'm facing also with it.
which is the state of this issue?