+
+ /**
+ * Checks the validity of the given ACL string
+ *
+ * @param string $acl_string
+ * @param int $uid
+ * @return bool
+ * @throws Exception
+ */
+ public static function isValidContact($acl_string, $uid)
+ {
+ if (empty($acl_string)) {
+ return true;
+ }
+
+ // split <x><y><z> into array of cids
+ preg_match_all('/<[A-Za-z0-9]+>/', $acl_string, $array);
+
+ // check for each cid if the contact is valid for the given user
+ $cid_array = $array[0];
+ foreach ($cid_array as $cid) {
+ $cid = str_replace(['<', '>'], ['', ''], $cid);
+ if (!DBA::exists('contact', ['id' => $cid, 'uid' => $uid])) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Checks the validity of the given ACL string
+ *
+ * @param string $acl_string
+ * @param int $uid
+ * @return bool
+ * @throws Exception
+ */
+ public static function isValidGroup($acl_string, $uid)
+ {
+ if (empty($acl_string)) {
+ return true;
+ }
+
+ // split <x><y><z> into array of cids
+ preg_match_all('/<[A-Za-z0-9]+>/', $acl_string, $array);
+
+ // check for each cid if the contact is valid for the given user
+ $gid_array = $array[0];
+ foreach ($gid_array as $gid) {
+ $gid = str_replace(['<', '>'], ['', ''], $gid);
+ if (!DBA::exists('group', ['id' => $gid, 'uid' => $uid, 'deleted' => false])) {
+ return false;
+ }
+ }
+
+ return true;
+ }