+ /**
+ * @brief Checks if a nickname is in the list of the forbidden nicknames
+ *
+ * Check if a nickname is forbidden from registration on the node by the
+ * admin. Forbidden nicknames (e.g. role namess) can be configured in the
+ * admin panel.
+ *
+ * @param string $nickname The nickname that should be checked
+ * @return boolean True is the nickname is blocked on the node
+ */
+ public static function isNicknameBlocked($nickname)
+ {
+ $forbidden_nicknames = Config::get('system', 'forbidden_nicknames', '');
+ // if the config variable is empty return false
+ if (!x($forbidden_nicknames)) {
+ return false;
+ }
+ // check if the nickname is in the list of blocked nicknames
+ $forbidden = explode(',', $forbidden_nicknames);
+ $forbidden = array_map('trim', $forbidden);
+ if (in_array(strtolower($nickname), $forbidden)) {
+ return true;
+ }
+ // else return false
+ return false;
+ }
+