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/usr/share/z-push/lib/request/moveitems.php is in z-push-common 2.3.8-2ubuntu1.

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The actual contents of the file can be viewed below.

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<?php
/***********************************************
* File      :   moveitems.php
* Project   :   Z-Push
* Descr     :   Provides the MOVEITEMS command
*
* Created   :   16.02.2012
*
* Copyright 2007 - 2016 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,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
* Consult LICENSE file for details
************************************************/

class MoveItems extends RequestProcessor {

    /**
     * Handles the MoveItems command
     *
     * @param int       $commandCode
     *
     * @access public
     * @return boolean
     */
    public function Handle($commandCode) {
        if(!self::$decoder->getElementStartTag(SYNC_MOVE_MOVES))
            return false;

        $moves = array();
        while(self::$decoder->getElementStartTag(SYNC_MOVE_MOVE)) {
            $move = array();
            if(self::$decoder->getElementStartTag(SYNC_MOVE_SRCMSGID)) {
                $move["srcmsgid"] = self::$decoder->getElementContent();
                if(!self::$decoder->getElementEndTag())
                    break;
            }
            if(self::$decoder->getElementStartTag(SYNC_MOVE_SRCFLDID)) {
                $move["srcfldid"] = self::$decoder->getElementContent();
                if(!self::$decoder->getElementEndTag())
                    break;
            }
            if(self::$decoder->getElementStartTag(SYNC_MOVE_DSTFLDID)) {
                $move["dstfldid"] = self::$decoder->getElementContent();
                if(!self::$decoder->getElementEndTag())
                    break;
            }
            array_push($moves, $move);

            if(!self::$decoder->getElementEndTag())
                return false;
        }

        if(!self::$decoder->getElementEndTag())
            return false;

        self::$encoder->StartWBXML();

        self::$encoder->startTag(SYNC_MOVE_MOVES);

        $operationResults = array();
        $operationCounter = 0;
        $operationTotal = count($moves);
        foreach($moves as $move) {
            $operationCounter++;
            self::$encoder->startTag(SYNC_MOVE_RESPONSE);
            self::$encoder->startTag(SYNC_MOVE_SRCMSGID);
            self::$encoder->content($move["srcmsgid"]);
            self::$encoder->endTag();

            $status = SYNC_MOVEITEMSSTATUS_SUCCESS;
            $result = false;
            try {
                $sourceBackendFolderId = self::$deviceManager->GetBackendIdForFolderId($move["srcfldid"]);

                // if the source folder is an additional folder the backend has to be setup correctly
                if (!self::$backend->Setup(ZPush::GetAdditionalSyncFolderStore($sourceBackendFolderId)))
                    throw new StatusException(sprintf("HandleMoveItems() could not Setup() the backend for folder id %s/%s", $move["srcfldid"], $sourceBackendFolderId), SYNC_MOVEITEMSSTATUS_INVALIDSOURCEID);

                $importer = self::$backend->GetImporter($sourceBackendFolderId);
                if ($importer === false)
                    throw new StatusException(sprintf("HandleMoveItems() could not get an importer for folder id %s/%s", $move["srcfldid"], $sourceBackendFolderId), SYNC_MOVEITEMSSTATUS_INVALIDSOURCEID);

                // get saved SyncParameters of the source folder
                $spa = self::$deviceManager->GetStateManager()->GetSynchedFolderState($move["srcfldid"]);
                if (!$spa->HasSyncKey())
                    throw new StatusException(sprintf("MoveItems(): Source folder id '%s' is not fully synchronized. Unable to perform operation.", $move["srcfldid"]), SYNC_MOVEITEMSSTATUS_INVALIDSOURCEID);

                // get saved SyncParameters of the destination folder
                $destSpa = self::$deviceManager->GetStateManager()->GetSynchedFolderState($move["dstfldid"]);
                if (!$destSpa->HasSyncKey()) {
                    $destSpa->SetFolderId($move["dstfldid"]);
                    $destSpa->SetSyncKey(self::$deviceManager->GetStateManager()->GetZeroSyncKey());
                }

                $importer->SetMoveStates($spa->GetMoveState(), $destSpa->GetMoveState());
                $importer->ConfigContentParameters($spa->GetCPO());

                $result = $importer->ImportMessageMove($move["srcmsgid"], self::$deviceManager->GetBackendIdForFolderId($move["dstfldid"]));
                // We discard the standard importer state for now.

                // Get the move states and save them in the SyncParameters of the src and dst folder
                list($srcMoveState, $dstMoveState) = $importer->GetMoveStates();
                if ($spa->GetMoveState() !== $srcMoveState) {
                    $spa->SetMoveState($srcMoveState);
                    self::$deviceManager->GetStateManager()->SetSynchedFolderState($spa);
                }
                if ($destSpa->GetMoveState() !== $dstMoveState) {
                    $destSpa->SetMoveState($dstMoveState);
                    self::$deviceManager->GetStateManager()->SetSynchedFolderState($destSpa);
                }
            }
            catch (StatusException $stex) {
                if ($stex->getCode() == SYNC_STATUS_FOLDERHIERARCHYCHANGED) // same as SYNC_FSSTATUS_CODEUNKNOWN
                    $status = SYNC_MOVEITEMSSTATUS_INVALIDSOURCEID;
                else
                    $status = $stex->getCode();
            }

            if ($operationCounter % 10 == 0) {
                self::$topCollector->AnnounceInformation(sprintf("Moved %d objects out of %d", $operationCounter, $operationTotal));
            }

            // save the operation result
            if (!isset($operationResults[$status])) {
                $operationResults[$status] = 0;
            }
            $operationResults[$status]++;

            self::$encoder->startTag(SYNC_MOVE_STATUS);
            self::$encoder->content($status);
            self::$encoder->endTag();

            self::$encoder->startTag(SYNC_MOVE_DSTMSGID);
            self::$encoder->content( (($result !== false ) ? $result : $move["srcmsgid"]));
            self::$encoder->endTag();
            self::$encoder->endTag();
        }

        self::$topCollector->AnnounceInformation(sprintf("Moved %d - Codes", $operationTotal), true);
        foreach ($operationResults as $status => $occurences) {
            self::$topCollector->AnnounceInformation(sprintf("%dx%d", $occurences, $status), true);
        }


        self::$encoder->endTag();
        return true;
    }
}