chore: merge branch 'forward_reset_url' into 'main'

feat:  Forward URLs to get back to login after registration

See merge request perun-proxy-aai/simplesamlphp/simplesamlphp-module-lsaai!8

themes/lsusernamelogin/core/loginuserpass.php

@@ -7,8 +7,13 @@ use SimpleSAML\Module\lsaai\TemplateHelper;
 
 const REGISTER_LINK = 'register_link';
 
+$backlink = (empty($_SERVER['HTTPS']) ? 'http' : 'https') . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
 $conf = Configuration::getConfig(TemplateHelper::CONFIG_FILE_NAME);
 $register_link = $conf->getString(REGISTER_LINK);
+parse_str(parse_url($register_link, PHP_URL_QUERY), $query_params);
+$query_params['targetnew'] = $query_params['targetexisting'] = $query_params['targetextended'] = $backlink;
+$register_link = strtok($register_link, '?') . '?' . http_build_query($query_params);
+
 
 if (strlen($this->data['username']) > 0) {
     $this->data['autofocus'] = 'password';