Set SonarQube Quality Gate Status to Jenkins Build Result

Jenkinsfile

def scannerHome = tool 'SonarQube Scanner 3';
withSonarQubeEnv(config.sonarqube_id) {
    sh "${scannerHome}/bin/sonar-scanner"
}

def props = readProperties  file: '.scannerwork/report-task.txt'
echo "properties=${props}"
def sonarServerUrl=props['serverUrl']
def ceTaskUrl= props['ceTaskUrl']
def projectKey = props['projectKey']
def ceTask
timeout(time: 1, unit: 'MINUTES') {
  waitUntil {
      def response = httpRequest url: ceTaskUrl, authentication: 'jenkins_scanner'
      ceTask = readJSON text: response.content
      echo ceTask.toString()
      return "SUCCESS".equals(ceTask["task"]["status"])
  }
}
qgateRequest = sonarServerUrl + '/api/measures/component?componentKey=' + projectKey + '&metricKeys=alert_status'
response = httpRequest url: qgateRequest, authentication: 'jenkins_scanner'
qgate = readJSON text: response.content
echo qgate.toString()
if ("ERROR".equals(qgate["component"]["measures"][0]["value"].toString()) && (currentBuild.result.equals("SUCCESS"))) {
  currentBuild.result = "UNSTABLE"
  echo "Quality Gates Status: " + qgate["component"]["measures"][0]["value"].toString()
  echo "Set build status to " + currentBuild.result
}