Add Folder to a Structure

import com.almworks.jira.structure.api.permissions.PermissionLevel
import com.almworks.jira.structure.api.StructureComponents
import com.onresolve.scriptrunner.runner.customisers.PluginModule
import com.onresolve.scriptrunner.runner.customisers.WithPlugin
import com.almworks.jira.structure.api.folder.Folder
import com.almworks.jira.structure.api.forest.action.ForestAction
import com.almworks.jira.structure.api.forest.ForestSpec
import com.almworks.jira.structure.api.forest.item.ItemForestBuilderImpl
import com.almworks.jira.structure.api.item.CoreIdentities

@WithPlugin("com.almworks.jira.structure")

@PluginModule
StructureComponents structureComponents

// Get components
def structureManager = structureComponents.structureManager
def folderManager = structureComponents.folderManager
def forestService = structureComponents.forestService

// Define the params (name of the structure, permission level of the structure and folder name)
final structureName = 'My structure'
final permissionLevel = PermissionLevel.ADMIN
final newFolderName = 'My folder'

def structures = structureManager.getStructuresByName(structureName, permissionLevel)
if (!structures) {
    log.warn "No existing Structure found with name '${structureName}' and permission level '${permissionLevel.name()}'"
    return
}

def structureId = structures.first().id

// Create the folder associated with the structure
def newFolder = Folder.named(newFolderName).setOwningStructure(structureId).build()
def folderItem = folderManager.createFolder(newFolder)
def forestBuilder = new ItemForestBuilderImpl()
forestBuilder.nextRow(CoreIdentities.folder(folderItem))

// Add the folder to the structure
def forestSource = forestService.getForestSource(ForestSpec.structure(structureId))
def forestToAdd = forestBuilder.build()
forestSource.apply(new ForestAction.Add(forestToAdd, 0, 0, 0))