ZP-1169 Reinitialize ICS exporter if it was used in Ping before on

re-usage.

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

src/backend/kopano/exporter.php

@@ -231,6 +231,18 @@ class ExportChangesICS implements IExportChanges{
         return $ret;
     }
 
+    /**
+     * Indicates if the exporter was configured with the BACKEND_DISCARD_DATA flag.
+     *
+     * @access public
+     * @return boolean
+     */
+    public function HasDiscardDataFlag() {
+        if (isset($this->flags) && $this->flags & BACKEND_DISCARD_DATA) {
+            return true;
+        }
+        return false;
+    }
 
     /**
      * Reads the current state from the Exporter

src/backend/kopano/kopanochangeswrapper.php

@@ -74,6 +74,12 @@ class KopanoChangesWrapper implements IImportChanges, IExportChanges {
      * @return KopanoChangesWrapper | boolean
      */
     static public function GetWrapper($storeName, $session, $store, $folderid, $ownFolder) {
+        // if existing exporter is used by Ping we need to discard it so it's fully reconfigured (ZP-1169)
+        if (isset(self::$wrappers[$storeName][$folderid]) && self::$wrappers[$storeName][$folderid]->HasDiscardDataFlag()) {
+            ZLog::Write(LOGLEVEL_DEBUG, "KopanoChangesWrapper::GetWrapper(): Found existing notification check exporter. Reinitializing.");
+            unset(self::$wrappers[$storeName][$folderid]);
+        }
+
         // check early due to the folderstats
         if (isset(self::$wrappers[$storeName][$folderid])) {
             return self::$wrappers[$storeName][$folderid];
@@ -151,6 +157,21 @@ class KopanoChangesWrapper implements IImportChanges, IExportChanges {
         return $this->current == $this->replyback;
     }
 
+    /**
+     * Indicates if the current IChanges object is an ICS exporter and has the BACKEND_DISCARD_DATA flag configured.
+     * These are used to verify notifications e.g. in Ping.
+     *
+     * @access private
+     * @return boolean
+     */
+    private function HasDiscardDataFlag() {
+        if (isset($this->current) && $this->current instanceof ExportChangesICS && $this->current->HasDiscardDataFlag()) {
+            return true;
+        }
+
+        return false;
+    }
+
     /**
      * Initializes the correct importer, exporter or ReplyBackImExporter.
      * The wrapper needs to be prepared as importer or exporter before.