import jenkins.*
import jenkins.model.*
import hudson.*
import hudson.model.*

def credentials = Jenkins.instance.getExtensionList(com.cloudbees.jenkins.GitHubPushTrigger.DescriptorImpl.class)[0].getCredentials()

if(credentials.size() > 0) {
  credentials.each {
    if(it.apiUrl.length() > 0) {
      println("apiUrl: " + it.apiUrl)
    }
    else {
      println("apiUrl: https://api.github.com/")
    }
    println("username: " + it.username)
    println("oauthAccessToken: " + it.oauthAccessToken)
  }
}