Scripts have access to the full classpath of Artifactory. However, the only API supported for plugins is the Artifactory Public API, defined in artifactory-papi.jar.
You can find the artifactory-papi.jar under WEB-INF/lib folder inside artifactory.war.
For more information, see Plugin Code Template.
IDE code completion
All major IDEs have good Groovy editing and debugging capabilities.
In order to make your developing experience complete, we provide support for our own DSL for IntelliJ IDEA. IntelliJ IDEA's Groovy DSL script for Artifactory User Plugins can be found in our GitHub repo.
Eclipse DSLD file is also available courtesy of James Carnegie.