Alfresco JavaScript Console script to reset the theme of all sites in Alfresco to the system default

reset-site-theme.js

var sites, idx, site, dashboard, xmlConfig;

sites = search.query({ language: 'fts-alfresco', query: 'TYPE:"st:sites"'});

for (idx = 0; idx < sites.length; idx++)
{
	site = sites[idx];
	dashboard = site.childrenByXPath('cm:surf-config/cm:pages/cm:site/cm:' + site.name + '/cm:dashboard.xml')[0];

	xmlConfig = dashboard.content;
	if (/<theme>/.test(xmlConfig))
	{
		print('Resetting theme for site ' + site.name);
		xmlConfig = String(xmlConfig).replace(/<theme>[^<]+<\/theme>/, '');
		dashboard.content = xmlConfig;
	}
}