ZP-777 Catch and filter hierarchy events.

Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/zarafa/zarafa.php

@@ -900,7 +900,23 @@ class BackendZarafa implements IBackend, ISearchProvider {
     public function ChangesSink($timeout = 30) {
         $notifications = array();
         $sinkresult = @mapi_sink_timedwait($this->changesSink, $timeout * 1000);
+        // reverse array so that the changes on folders are before changes on messages and
+        // it's possible to filter such notifications
+        $sinkresult = array_reverse($sinkresult, true);
         foreach ($sinkresult as $sinknotif) {
+            // add a notification on a folder
+            if ($sinknotif['objtype'] == MAPI_FOLDER) {
+                ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendZarafa->ChangesSink() Hierarchy notification for folder %s", bin2hex($sinknotif['entryid'])));
+                $notifications[$sinknotif['entryid']] = IBackend::HIERARCHYNOTIFICATION;
+            }
+            // change on a message, remove hierarchy notification
+            if (isset($sinknotif['parentid']) && $sinknotif['objtype'] == MAPI_MESSAGE && isset($notifications[$sinknotif['parentid']])) {
+                ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendZarafa->ChangesSink() Remove hierarchy notification for %s because it is not relevant",
+                        bin2hex($sinknotif['parentid'])));
+                unset($notifications[$sinknotif['parentid']]);
+            }
+
+            // TODO check if adding $sinknotif['objtype'] = MAPI_MESSAGE wouldn't break anything
             // check if something in the monitored folders changed
             if (isset($sinknotif['parentid']) && array_key_exists($sinknotif['parentid'], $this->changesSinkFolders)) {
                 $notifications[] = $this->changesSinkFolders[$sinknotif['parentid']];

src/lib/core/synccollections.php

@@ -14,7 +14,7 @@
 *
 * Created   :   06.01.2012
 *
-* Copyright 2007 - 2013 Zarafa Deutschland GmbH
+* Copyright 2007 - 2015 Zarafa Deutschland GmbH
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
@@ -517,6 +517,11 @@ class SyncCollections implements Iterator {
 
                 $validNotifications = false;
                 foreach ($notifications as $folderid) {
+                    if ($folderid == IBackend::HIERARCHYNOTIFICATION) {
+                        // TODO verify hierarchy notification by configuring an exporter with the latest changes.
+                        ZLog::Write(LOGLEVEL_DEBUG, "Found hierarchy notification.");
+                        continue;
+                    }
                      // check if the notification on the folder is within our filter
                      if ($this->CountChange($folderid)) {
                          ZLog::Write(LOGLEVEL_DEBUG, sprintf("SyncCollections->CheckForChanges(): Notification received on folder '%s'", $folderid));