Nexus artifacts Jenkins dropdown demo

nexus_version.groovy

node('linux') {
  def ver
  stage ('Stage 1') {
     withCredentials([usernamePassword(credentialsId: 'nexus_user_cred', usernameVariable: 'USERNAME', passwordVariable: 'PASSWORD')]) {
         def versions = getVersionId('http://nexus.example.com:8081/nexus/service/local', "${USERNAME}", "${PASSWORD}",'distrib', 'test1')
         ver = input message: 'Get version',
                 parameters: [choice(choices: versions, description: '', name: 'versions')]
         file_name = ver + '.zip'
         getNexusFile(file_name, "${USERNAME}", "${PASSWORD}", 'http://nexus.example.com:8081/nexus/service/local', 'loans.car', ver, 'zip', 'test_elease', 'distrib', '')
     }
  }
  stage ('send mail') {
    echo "pass"
  }
}
 
 
def getNexusFile(fileName, username, password, nexusRestApiUrl, nexusArtifactId, nexusVersionId, nexusExtensionId, nexusRepositoryId, nexusGroupId, classifier) {
    def nexus_url = "${nexusRestApiUrl}/artifact/maven/redirect?g=${nexusGroupId}&a=${nexusArtifactId}&v=${nexusVersionId}&e=${nexusExtensionId}&r=${nexusRepositoryId}&c=${classifier}"
    def authString = "${username}:${password}".getBytes().encodeBase64().toString()
    httpRequest customHeaders: [[maskValue: true, name: "Authorization", value: "Basic ${authString}"]], outputFile: fileName, ignoreSslErrors: true, responseHandle: 'NONE', url: nexus_url
    wk = pwd()
    if (nexusExtensionId == 'rar') {
        sh "unrar x -y -idp -ai -u ${fileName} ${wk}/"
    }
    if (nexusExtensionId == 'zip') {
        sh "unzip -o -d ${wk} ${fileName}"
    }
}
 
def getVersionId(nexusRestApiUrl, username, password, nexusGroupId, nexusArtifactId) {
    def addr = "${nexusRestApiUrl}/lucene/search?g=${nexusGroupId}&a=${nexusArtifactId}"
    def authString = "${username}:${password}".getBytes().encodeBase64().toString()
    def response = httpRequest customHeaders: [[maskValue: true, name: "Authorization", value: "Basic ${authString}"]], ignoreSslErrors: true, url: addr, validResponseCodes: '200'
    def xml = new XmlParser().parseText(response.content);
    xml['data']['artifact']['version'].collect { it ->
        it.text()
    }.unique().join("\n")
}