ParameterOverrides string can fail CloudFormation character limit

It is possible to generate a CloudFormation template with a value in the CodePipeline.Stages.Actions.Configuration.ParameterOverrides field that violates the maximum character limit.

Reproduction Steps

new CloudFormationCreateUpdateStackAction({
  parameterOverrides: {
    test: "somethingOver1000Characters..."
  }
});

Error Log

Pipeline (PipelineXYZ) 1 validation error detected: Value at 'pipeline.stages.4.member.actions.1.member.configuration' failed to satisfy constraint: Map value must satisfy constraint: [Member must have length less than or equal to 1000, Member must have length greater than or equal to 1]

Environment

• CLI Version : aws-cli/1.16.130 Python/3.7.4 Darwin/18.7.0 botocore/1.12.120
• Framework Version: 1.20
• OS : macOS
• Language : TypeScript

Other

As a possible solution, it seems the JSON to string transformation performed here could be adapted to make us of the Fn::Join function.

Looking at the tests it would suggest this is already being done but I have not been able to generate a CFN template that uses Fn::Join as asserted here.

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This is 🐛 Bug Report

[lukehedger]

All fixed, thanks @skinny85!

[skinny85]

No problem, let me know if that fixes your issue!