as_login.php

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<?php
 
if (!isset($_REQUEST['ReturnTo'])) {
        throw new SimpleSAML_Error_BadRequest('Missing ReturnTo parameter.');
}
 
if (!isset($_REQUEST['AuthId'])) {
        throw new SimpleSAML_Error_BadRequest('Missing AuthId parameter.');
}
 
/*
 * Setting up the options for the requireAuth() call later..
 */
$options = array(
        'ReturnTo' => \SimpleSAML\Utils\HTTP::checkURLAllowed($_REQUEST['ReturnTo']),
);
 
/*
 * Allows a saml:idp query string parameter specify the IdP entity ID to be used
 * as used by the DiscoJuice embedded client.
 */
if (!empty($_REQUEST['saml:idp'])) {
        $options['saml:idp'] = $_REQUEST['saml:idp'];
}
 
$as = new \SimpleSAML\Auth\Simple($_REQUEST['AuthId']);
$as->requireAuth($options);
 
\SimpleSAML\Utils\HTTP::redirectTrustedURL($options['ReturnTo']);