nexus-3 repository clean groovy script

cleanRepo.groovy

import org.sonatype.nexus.repository.storage.Asset;
import org.sonatype.nexus.repository.storage.Component;
import org.sonatype.nexus.repository.storage.Query;
import org.sonatype.nexus.repository.storage.StorageFacet;
import org.sonatype.nexus.repository.storage.Query.Builder;
import groovy.json.JsonOutput;
import groovy.json.JsonSlurper;

def request = new JsonSlurper().parseText(args);
assert request.repoName: 'repoName parameter is required';
def count = request.count ?: 5;
def compInfo = { Component c -> "{${c.group()}:${c.name()}:${c.version()}:${c.lastUpdated()}}" };
def repo = repository.repositoryManager.get(request.repoName);
StorageFacet storageFacet = repo.facet(StorageFacet);
def tx = storageFacet.txSupplier().get();
def urls = [];
Builder qBuilder = Query.builder();

if ( request.groupId != null ) 
    qBuilder.where('group = ').param(request.groupId);
if ( request.artifactId != null ) {
    if (qBuilder.hasWhere()) {
        qBuilder.and('name = ').param(request.artifactId);
    } else {
        qBuilder.where('name = ').param(request.artifactId);
    };
};

tx.begin();
Iterable<Component> comps = tx.findComponents(qBuilder.build(), [repo]);
tx.close();
def componentByName = [:];

for(Component comp : comps) {
  if(componentByName.containsKey( comp.name() )) {
    componentByName.get(comp.name()).add(comp);
  }  else  {
    componentByName.put(comp.name(), [comp]);
  };
};
def toDelete = [];
for(List<Component> compList : componentByName.values()) {
   if ( compList.size() > count ) {
       compList.sort( { a,b-> a.lastUpdated() <=> b.lastUpdated() } );
       for( int idx = 0; idx < compList.size() - count; ++idx) {
           toDelete.add(compList.get(idx));
       }
   }
};

if(request.delete) {
    toDelete.each({
        tx2 = storageFacet.txSupplier().get();
        tx2.begin();
        tx2.deleteComponent(it);
        tx2.commit();
        tx2.close();
    });
    log.info(toDelete.size() + " components deleted");
};
return toDelete.flatten(compInfo);