share_information_between_stages_3.ts

export class SSMParameterReader extends AwsCustomResource {
  constructor(scope: Construct, name: string, props: SSMParameterReaderProps) {
    const { parameterName, region } = props

    const ssmAwsSdkCall: AwsSdkCall = {
      service: 'SSM',
      action: 'getParameter',
      parameters: {
        Name: parameterName
      },
      region,
      physicalResourceId: { id: Date.now().toString() } // Update physical id to always fetch the latest version
    }

    super(scope, name, {
      onUpdate: ssmAwsSdkCall,
      policy: AwsCustomResourcePolicy.fromStatements([
        new iam.PolicyStatement({
          resources: ['*'],
          actions: ['ssm:GetParameter'],
          effect: iam.Effect.ALLOW
        })
      ])
    }
    )
  }

  public getParameterValue(): string {
    return this.getResponseField('Parameter.Value')
  }
}