function HandleSync($backend, $protocolversion, $devid)
{
global $zpushdtd;
global $input, $output;
// Contains all containers requested
$collections = array();
// Init WBXML decoder
$decoder = new WBXMLDecoder($input, $zpushdtd);
// Init state machine
$statemachine = new StateMachine();
// Start decode
if (!$decoder->getElementStartTag(SYNC_SYNCHRONIZE)) {
return false;
}
if (!$decoder->getElementStartTag(SYNC_FOLDERS)) {
return false;
}
while ($decoder->getElementStartTag(SYNC_FOLDER)) {
$collection = array();
$collection["truncation"] = SYNC_TRUNCATION_ALL;
$collection["clientids"] = array();
$collection["fetchids"] = array();
if (!$decoder->getElementStartTag(SYNC_FOLDERTYPE)) {
return false;
}
$collection["class"] = $decoder->getElementContent();
debugLog("Sync folder:{$collection["class"]}");
if (!$decoder->getElementEndTag()) {
return false;
}
if (!$decoder->getElementStartTag(SYNC_SYNCKEY)) {
return false;
}
$collection["synckey"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
if ($decoder->getElementStartTag(SYNC_FOLDERID)) {
$collection["collectionid"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
if ($decoder->getElementStartTag(SYNC_SUPPORTED)) {
while (1) {
$el = $decoder->getElement();
if ($el[EN_TYPE] == EN_TYPE_ENDTAG) {
break;
}
}
}
if ($decoder->getElementStartTag(SYNC_DELETESASMOVES)) {
$collection["deletesasmoves"] = true;
}
if ($decoder->getElementStartTag(SYNC_GETCHANGES)) {
$collection["getchanges"] = true;
}
if ($decoder->getElementStartTag(SYNC_MAXITEMS)) {
$collection["maxitems"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
if ($decoder->getElementStartTag(SYNC_OPTIONS)) {
while (1) {
if ($decoder->getElementStartTag(SYNC_FILTERTYPE)) {
$collection["filtertype"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
if ($decoder->getElementStartTag(SYNC_TRUNCATION)) {
$collection["truncation"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
if ($decoder->getElementStartTag(SYNC_RTFTRUNCATION)) {
$collection["rtftruncation"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
if ($decoder->getElementStartTag(SYNC_MIMESUPPORT)) {
$collection["mimesupport"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
if ($decoder->getElementStartTag(SYNC_MIMETRUNCATION)) {
$collection["mimetruncation"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
if ($decoder->getElementStartTag(SYNC_CONFLICT)) {
$collection["conflict"] = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
return false;
}
}
$e = $decoder->peek();
if ($e[EN_TYPE] == EN_TYPE_ENDTAG) {
$decoder->getElementEndTag();
break;
}
}
}
// compatibility mode - get folderid from the state directory
if (!isset($collection["collectionid"])) {
$collection["collectionid"] = _getFolderID($devid, $collection["class"]);
}
// compatibility mode - set default conflict behavior if no conflict resolution algorithm is set (OVERWRITE_PIM)
if (!isset($collection["conflict"])) {
$collection["conflict"] = 1;
}
//compatibility mode - set maxitems if the client doesn't send it as it breaks some devices
if (!isset($collection["maxitems"])) {
$collection["maxitems"] = 100;
}
// Get our sync state for this collection
$collection["syncstate"] = $statemachine->getSyncState($collection["synckey"]);
if ($decoder->getElementStartTag(SYNC_PERFORM)) {
// Configure importer with last state
$importer = $backend->GetContentsImporter($collection["collectionid"]);
$importer->Config($collection["syncstate"], $collection["conflict"]);
$nchanges = 0;
while (1) {
$element = $decoder->getElement();
// MODIFY or REMOVE or ADD or FETCH
if ($element[EN_TYPE] != EN_TYPE_STARTTAG) {
$decoder->ungetElement($element);
break;
}
$nchanges++;
if ($decoder->getElementStartTag(SYNC_SERVERENTRYID)) {
$serverid = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
// end serverid
return false;
}
} else {
$serverid = false;
}
if ($decoder->getElementStartTag(SYNC_CLIENTENTRYID)) {
$clientid = $decoder->getElementContent();
if (!$decoder->getElementEndTag()) {
// end clientid
return false;
}
} else {
$clientid = false;
}
// Get application data if available
if ($decoder->getElementStartTag(SYNC_DATA)) {
switch ($collection["class"]) {
case "Email":
$appdata = new SyncMail();
$appdata->decode($decoder);
break;
case "Contacts":
$appdata = new SyncContact($protocolversion);
$appdata->decode($decoder);
break;
case "Calendar":
$appdata = new SyncAppointment();
$appdata->decode($decoder);
break;
case "Tasks":
$appdata = new SyncTask();
$appdata->decode($decoder);
break;
}
if (!$decoder->getElementEndTag()) {
// end applicationdata
return false;
}
}
switch ($element[EN_TAG]) {
case SYNC_MODIFY:
if (isset($appdata)) {
if (isset($appdata->read)) {
// Currently, 'read' is only sent by the PDA when it is ONLY setting the read flag.
$importer->ImportMessageReadFlag($serverid, $appdata->read);
} else {
$importer->ImportMessageChange($serverid, $appdata);
}
$collection["importedchanges"] = true;
}
break;
case SYNC_ADD:
if (isset($appdata)) {
$id = $importer->ImportMessageChange(false, $appdata);
if ($clientid && $id) {
$collection["clientids"][$clientid] = $id;
$collection["importedchanges"] = true;
}
}
break;
case SYNC_REMOVE:
if (isset($collection["deletesasmoves"])) {
$folderid = $backend->GetWasteBasket();
if ($folderid) {
$importer->ImportMessageMove($serverid, $folderid);
$collection["importedchanges"] = true;
break;
}
}
$importer->ImportMessageDeletion($serverid);
$collection["importedchanges"] = true;
break;
case SYNC_FETCH:
array_push($collection["fetchids"], $serverid);
break;
}
if (!$decoder->getElementEndTag()) {
// end change/delete/move
return false;
}
}
debugLog("Processed {$nchanges} incoming changes");
// Save the updated state, which is used for the exporter later
$collection["syncstate"] = $importer->getState();
if (!$decoder->getElementEndTag()) {
// end commands
return false;
}
}
if (!$decoder->getElementEndTag()) {
// end collection
return false;
}
array_push($collections, $collection);
}
if (!$decoder->getElementEndTag()) {
// end collections
return false;
}
if (!$decoder->getElementEndTag()) {
// end sync
return false;
}
$encoder = new WBXMLEncoder($output, $zpushdtd);
$encoder->startWBXML();
$encoder->startTag(SYNC_SYNCHRONIZE);
$encoder->startTag(SYNC_FOLDERS);
foreach ($collections as $collection) {
// initialize exporter to get changecount
$changecount = 0;
if (isset($collection["getchanges"])) {
// Use the state from the importer, as changes may have already happened
$exporter = $backend->GetExporter($collection["collectionid"]);
$filtertype = isset($collection["filtertype"]) ? $collection["filtertype"] : false;
$exporter->Config($importer, $collection["class"], $filtertype, $collection["syncstate"], 0, $collection["truncation"]);
$changecount = $exporter->GetChangeCount();
}
// Get a new sync key to output to the client if any changes have been requested or will be send
if (isset($collection["importedchanges"]) || $changecount > 0 || $collection["synckey"] == "0") {
$collection["newsynckey"] = $statemachine->getNewSyncKey($collection["synckey"]);
}
$encoder->startTag(SYNC_FOLDER);
$encoder->startTag(SYNC_FOLDERTYPE);
$encoder->content($collection["class"]);
$encoder->endTag();
$encoder->startTag(SYNC_SYNCKEY);
if (isset($collection["newsynckey"])) {
$encoder->content($collection["newsynckey"]);
} else {
$encoder->content($collection["synckey"]);
}
$encoder->endTag();
$encoder->startTag(SYNC_FOLDERID);
$encoder->content($collection["collectionid"]);
$encoder->endTag();
$encoder->startTag(SYNC_STATUS);
$encoder->content(1);
$encoder->endTag();
//check the mimesupport because we need it for advanced emails
$mimesupport = isset($collection['mimesupport']) ? $collection['mimesupport'] : 0;
// Output server IDs for new items we received from the PDA
if (isset($collection["clientids"]) || count($collection["fetchids"]) > 0) {
$encoder->startTag(SYNC_REPLIES);
foreach ($collection["clientids"] as $clientid => $serverid) {
$encoder->startTag(SYNC_ADD);
$encoder->startTag(SYNC_CLIENTENTRYID);
$encoder->content($clientid);
$encoder->endTag();
$encoder->startTag(SYNC_SERVERENTRYID);
$encoder->content($serverid);
$encoder->endTag();
$encoder->startTag(SYNC_STATUS);
$encoder->content(1);
$encoder->endTag();
$encoder->endTag();
}
foreach ($collection["fetchids"] as $id) {
$data = $backend->Fetch($collection["collectionid"], $id, $mimesupport);
if ($data !== false) {
$encoder->startTag(SYNC_FETCH);
$encoder->startTag(SYNC_SERVERENTRYID);
$encoder->content($id);
$encoder->endTag();
$encoder->startTag(SYNC_STATUS);
$encoder->content(1);
$encoder->endTag();
$encoder->startTag(SYNC_DATA);
$data->encode($encoder);
$encoder->endTag();
$encoder->endTag();
} else {
debugLog("unable to fetch {$id}");
}
}
$encoder->endTag();
}
if (isset($collection["getchanges"])) {
// exporter already intialized
if ($changecount > $collection["maxitems"]) {
$encoder->startTag(SYNC_MOREAVAILABLE, false, true);
}
// Output message changes per folder
$encoder->startTag(SYNC_PERFORM);
// Stream the changes to the PDA
$importer = new ImportContentsChangesStream($encoder, GetObjectClassFromFolderClass($collection["class"]));
$filtertype = isset($collection["filtertype"]) ? $collection["filtertype"] : 0;
$n = 0;
while (1) {
$progress = $exporter->Synchronize();
if (!is_array($progress)) {
break;
}
$n++;
if ($n >= $collection["maxitems"]) {
debugLog("Exported maxItems of messages: " . $collection["maxitems"] . " - more available");
break;
}
}
$encoder->endTag();
}
$encoder->endTag();
// Save the sync state for the next time
if (isset($collection["newsynckey"])) {
if (isset($exporter) && $exporter) {
$state = $exporter->GetState();
} else {
if (isset($importer) && $importer) {
$state = $importer->GetState();
} else {
if ($collection["synckey"] == "0") {
$state = "";
}
}
}
if (isset($state)) {
$statemachine->setSyncState($collection["newsynckey"], $state);
} else {
debugLog("error saving " . $collection["newsynckey"] . " - no state information available");
}
}
}
$encoder->endTag();
$encoder->endTag();
return true;
}