Nexus Repository Manager 3 script for creating a proxy repository of an upstream that requires HTTP authentication.

create-proxy-repository.groovy

def configuration = new org.sonatype.nexus.repository.config.Configuration()
configuration.setAttributes(
  'maven': [
    'versionPolicy': 'RELEASE',
    'layoutPolicy': 'STRICT'
  ],
  'proxy': [
    'remoteUrl': 'http://localhost:8000',
    'contentMaxAge': -1,
    'metadataMaxAge': 1440
  ],
  'httpclient': [
    'blocked': false,
    'autoBlock': true,
    'authentication': [
      'type': 'username',
      'username': 'username',
      'password': 'password',
      'ntlmHost': '',
      'ntlmDomain': ''
    ]
  ],
  'storage': [
    'blobStoreName': 'default',
    'strictContentTypeValidation': true
  ]
)
configuration.setRepositoryName('my-repository2')
configuration.setRecipeName('maven2-proxy')
configuration.setOnline(true)

def repositoryManager = container.lookup(org.sonatype.nexus.repository.manager.RepositoryManager.class.name)
repositoryManager.create(configuration)