Jenkinsfile

pipeline {
    parameters {
      string(name: 'SLACK_CHANNEL_TOKEN_CREDENTIAL',
      description: 'Default Slack token credential',
      defaultValue: 'your-token-credential')

      string(name: 'SLACK_CHANNEL_BASEURL',
      description: 'Default Slack base url',
      defaultValue: 'your-slack-base-url')

      string(name: 'SLACK_CHANNEL',
      description: 'Default Slack channel to send messages to',
      defaultValue: '#your-slack-channel-name')
    }

    stages {
          ....
    }
    post {
      aborted {
        slackSend baseUrl: "${params.SLACK_CHANNEL_BASEURL}", botUser: true, channel: "${params.SLACK_CHANNEL}", color: 'warning', failOnError: true, message: "*ABORTED:*: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]' (${env.BUILD_URL})", tokenCredentialId: "${params.SLACK_CHANNEL_TOKEN_CREDENTIAL}"
      } // aborted

      failure {
        slackSend baseUrl: "${params.SLACK_CHANNEL_BASEURL}", botUser: true, channel: "${params.SLACK_CHANNEL}", color: 'danger', failOnError: true, message: "*FAILED:* Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]' (${env.BUILD_URL})", tokenCredentialId: "${params.SLACK_CHANNEL_TOKEN_CREDENTIAL}"
      } // failure

      success {
        slackSend baseUrl: "${params.SLACK_CHANNEL_BASEURL}", botUser: true, channel: "${params.SLACK_CHANNEL}", color: 'good', failOnError: true, message: "*SUCCESS:*: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]' (${env.BUILD_URL})", tokenCredentialId: "${params.SLACK_CHANNEL_TOKEN_CREDENTIAL}"
      } // success
    }
}