SimpleSAMLphp includes a metarefresh module that will automatically refresh and verify federation metadata. The following example fetches the production metadata aggregate. See the Download InCommon Metadata wiki page for other options.

Before you can verify the XML signature on a metadata aggregate, you need an authentic copy of the InCommon Metadata signing certificate. Do this first, before configuring simpleSAMLphp for metadata refresh.

The relevant portion of a sample configuration file (config-metarefresh.php) is shown below:

Configure the metarefresh module included with SimpleSAMLphp 1.11 (and later)
'incommon' => array(
	'cron'  => array('frequent'),
	'sources'   => array(
                    'src'   => '',
                    'certificates' => array(
                    'template' => array(
                        'tags'  => array('all', 'incommon'),
                        'authproc' => array(
                            51 => array('class' => 'core:AttributeMap', 'oid2name'),
	'expireAfter'       => 60*60*24*7, // Maximum 7 days cache time.
	'outputDir'     => 'metadata/metarefresh/incommon',
	'outputFormat' => 'flatfile',