Add CSRF checks

apps/calendar/ajax/share/changepermission.php

@@ -5,7 +5,9 @@
  * later.
  * See the COPYING-README file.
  */
- 
+
+OCP\JSON::callCheck();
+
 $id = strip_tags($_POST['id']);
 $idtype = strip_tags($_POST['idtype']);
 $permission = (int) strip_tags($_POST['permission']);

apps/calendar/ajax/share/share.php

@@ -6,6 +6,8 @@
  * See the COPYING-README file.
  */
  
+OCP\JSON::callCheck();
+
 $id = strip_tags($_POST['id']);
 $idtype = strip_tags($_POST['idtype']);
 switch($idtype){

apps/calendar/ajax/share/unshare.php

@@ -5,7 +5,9 @@
  * later.
  * See the COPYING-README file.
  */
- 
+
+OCP\JSON::callCheck();
+
 $id = strip_tags($_POST['id']);
 $idtype = strip_tags($_POST['idtype']);
 switch($idtype){