cicd: simple jenkins conditional pipeline on aws

def awsCredentials = [[$class: 'AmazonWebServicesCredentialsBinding', credentialsId: 'aws-deploy-credentials']]

pipeline {
    agent any

    environment {
      AWS_DEFAULT_REGION = 'eu-west-1'
    }

    options {
      disableConcurrentBuilds()
      parallelsAlwaysFailFast()
      timestamps()
      withCredentials(awsCredentials)
    }

    stages {

        stage('build') {
            steps {
                sh  """
                    # Some commands
                    echo Starting deployment.
                    aws sts get-caller-identity
                    """
                script {
                  timeout(time: 10, unit: 'MINUTES') {
                      finalStage = input message: 'What should I do next?', ok: 'Continue',
                            parameters: [choice(name: 'Next stage:', choices: 'finish\nrollback\nlol', description: 'Finish will delete old version, rollback will activate the old version, abort will stop the pipeline.')]
                  }
                }
            }
        }

        stage('finish') {
            when {
                expression { finalStage == 'finish' }
            }
            steps {
                sh  """
                    # some commands
                    echo "Good! Deleting green (old) version."
                    """
            }
        }
        stage('rollback') {
            when {
                expression { finalStage == 'rollback' }
            }
            steps {
                sh  """
                    # some commands
                    echo "No problem! Rolling back to green (old) version."
                    """
            }
        }
    }

  post {
    always {
      cleanWs()
    }
  }
}