enable calendar sharing

conf/caldav.php

@@ -84,7 +84,7 @@ $config['public_caldav_url'] = '';
  * support WebDAV ACLs disable sharing
  */
 
-$config['enable_calendar_sharing'] = FALSE;
+$config['enable_calendar_sharing'] = TRUE;
 
 // Default permissions for calendar owner
 $config['owner_permissions'] = array('all', 'read', 'unlock', 'read-acl',

sources/web/application/libraries/Caldav.php

@@ -500,6 +500,23 @@ class Caldav {
      */
     function setacl( $user, $passwd, $calendar = '',
                         $share_with = array()) {
+
+        /**
+         * Modification for Yunohost
+         *
+         * Radicale does not support ACL as Agendav implements it,
+         * and this triggers an error 502.
+         *
+         * But Radicale is set up without ACL (because of the LDAP plugin),
+         * so actually all users have read-write access to all other users
+         * collections.
+         * This is sufficient for us to enable the sharing of calendars in
+         * AgenDAV. We simply skip the ACL request. Sharing status is
+         * stored by AgenDAV in its db.
+         *
+         */
+        return TRUE;
+
         $this->prepare_client($user, $passwd, '');
 
         // Preconditions