(@aws-cdk/aws-stepfunction-tasks): Unnecessary validation of field "Headers" in CallApiGatewayRestApiEndpoint

[paraspra]

The validation of Header property in constructor of CallApiGatewayRestApiEndpoint is unnecessary as StepFunction UI (i.e Amazon States Language) allows apigateway:invoke.waitForTaskToken without "Header" property.

Also, as per HttpHeaderDeserializer in StepFunctionsHttpConnectors , Headers property is deserialized as Map<String, List<String>> . Constructing this structure in CDK with JsonPath is currently not possible.

This validation is enforcing to add headers: TaskInput.fromObject({ TaskToken: JsonPath.taskToken) in CallApiGatewayRestApiEndpoint props. When task with this configuration is deployed and run in AWS StepFunction it throws errror parameter could not be used to start the Task: [The value of the field 'Headers' has an invalid format]"

Reproduction Steps

create Task, and deploy it. Try to run this stepFunction.

const task = new CallApiGatewayRestApiEndpoint(this, title, {
            api: restAPI,
            method: HttpMethod.PUT,
            stageName: apiStage,
            requestBody: TaskInput.fromObject({})
            authType: AuthType.IAM_ROLE,
            apiPath: apiPath,
            resultPath: resultPath,
            headers: TaskInput.fromObject({ TaskToken: JsonPath.taskToken),
            integrationPattern: IntegrationPattern.WAIT_FOR_TASK_TOKEN
          })

What did you expect to happen?

Task should make a call to the ApiGateway

What actually happened?

Exception during task execution
parameter could not be used to start the Task: [The value of the field 'Headers' has an invalid format]"

Environment

• CDK CLI Version : 1.96.0
• Framework Version: 1.96.0
• Node.js Version: v14.6.0
• OS : MacOS
• Language (Version): TypeScript

Other

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This is 🐛 Bug Report

[rix0rrr]

From this ticket: #14184, apparently you need to put States.Array() around the task token:

            headers: TaskInput.fromObject({ TaskToken: `States.Array(${JsonPath.taskToken})` }),

If you find that hard to read, it's the same as:

            headers: TaskInput.fromObject({ TaskToken: 'States.Array(' + JsonPath.taskToken +')' }),

[rix0rrr]

Nevermind, this does not work.