SimpleSAML_XHTML_IdPDisco::handleRequest PHP Method

    public function handleRequest()
    {
        $this->start();
        // no choice made. Show discovery service page
        $idpList = $this->getIdPList();
        $idpList = $this->filterList($idpList);
        $preferredIdP = $this->getRecommendedIdP();
        $idpintersection = array_intersect(array_keys($idpList), $this->getScopedIDPList());
        if (sizeof($idpintersection) > 0) {
            $idpList = array_intersect_key($idpList, array_fill_keys($idpintersection, null));
        }
        $idpintersection = array_values($idpintersection);
        if (sizeof($idpintersection) == 1) {
            $this->log('Choice made [' . $idpintersection[0] . '] (Redirecting the user back. returnIDParam=' . $this->returnIdParam . ')');
            \SimpleSAML\Utils\HTTP::redirectTrustedURL($this->returnURL, array($this->returnIdParam => $idpintersection[0]));
        }
        /*
         * Make use of an XHTML template to present the select IdP choice to the user. Currently the supported options
         * is either a drop down menu or a list view.
         */
        switch ($this->config->getString('idpdisco.layout', 'links')) {
            case 'dropdown':
                $templateFile = 'selectidp-dropdown.php';
                break;
            case 'links':
                $templateFile = 'selectidp-links.php';
                break;
            default:
                throw new Exception('Invalid value for the \'idpdisco.layout\' option.');
        }
        $t = new SimpleSAML_XHTML_Template($this->config, $templateFile, 'disco');
        $t->data['idplist'] = $idpList;
        $t->data['preferredidp'] = $preferredIdP;
        $t->data['return'] = $this->returnURL;
        $t->data['returnIDParam'] = $this->returnIdParam;
        $t->data['entityID'] = $this->spEntityId;
        $t->data['urlpattern'] = htmlspecialchars(\SimpleSAML\Utils\HTTP::getSelfURLNoQuery());
        $t->data['rememberenabled'] = $this->config->getBoolean('idpdisco.enableremember', false);
        $t->show();
    }

<?php

/**
 * WARNING:
 *
 * THIS FILE IS DEPRECATED AND WILL BE REMOVED IN FUTURE VERSIONS
 *
 * @deprecated
 */
require_once '../../_include.php';
SimpleSAML_Logger::warning('The file shib13/sp/idpdisco.php is deprecated and will be removed in future versions.');
try {
    $discoHandler = new SimpleSAML_XHTML_IdPDisco(array('shib13-idp-remote'), 'shib13');
} catch (Exception $exception) {
    /* An error here should be caused by invalid query parameters. */
    throw new SimpleSAML_Error_Error('DISCOPARAMS', $exception);
}
try {
    $discoHandler->handleRequest();
} catch (Exception $exception) {
    /* An error here should be caused by metadata. */
    throw new SimpleSAML_Error_Error('METADATA', $exception);
}