public function updated()
{
if (empty($_REQUEST['lastsync'])) {
$this->error(400, 'NO_LAST_SYNC_TIME', 'Last sync time not provided');
}
$lastsync = false;
if (is_numeric($_REQUEST['lastsync'])) {
$lastsync = (int) $_REQUEST['lastsync'];
} else {
$this->error(400, 'INVALID_LAST_SYNC_TIME', 'Last sync time is invalid');
}
$this->sessionCheck();
if (isset($_SERVER['HTTP_X_ZOTERO_VERSION'])) {
require_once '../model/ToolkitVersionComparator.inc.php';
if (ToolkitVersionComparator::compare($_SERVER['HTTP_X_ZOTERO_VERSION'], "2.0.4") < 0) {
$futureUsers = Z_Core::$MC->get('futureUsers');
if (!$futureUsers) {
$futureUsers = Zotero_DB::columnQuery("SELECT userID FROM futureUsers");
Z_Core::$MC->set('futureUsers', $futureUsers, 1800);
}
if (in_array($this->userID, $futureUsers)) {
Z_Core::logError("Blocking sync for future user " . $this->userID . " with version " . $_SERVER['HTTP_X_ZOTERO_VERSION']);
$upgradeMessage = "Due to improvements made to sync functionality, you must upgrade to Zotero 2.0.6 or later (via Firefox's Tools menu -> Add-ons -> Extensions -> Find Updates or from zotero.org) to continue syncing your Zotero library.";
$this->error(400, 'UPGRADE_REQUIRED', $upgradeMessage);
}
}
}
$doc = new DOMDocument();
$domResponse = dom_import_simplexml($this->responseXML);
$domResponse = $doc->importNode($domResponse, true);
$doc->appendChild($domResponse);
try {
$result = Zotero_Sync::getSessionDownloadResult($this->sessionID);
} catch (Exception $e) {
$this->handleUpdatedError($e);
}
// XML response
if (is_string($result)) {
$this->clearWaitTime($this->sessionID);
$this->responseXML = new SimpleXMLElement($result);
$this->end();
}
// Queued
if ($result === false) {
$queued = $this->responseXML->addChild('locked');
$queued['wait'] = $this->getWaitTime($this->sessionID);
$this->end();
}
// Not queued
if ($result == -1) {
// See if we're locked
Zotero_DB::beginTransaction();
if (Zotero_Sync::userIsWriteLocked($this->userID) || !empty($_REQUEST['upload']) && Zotero_Sync::userIsReadLocked($this->userID)) {
Zotero_DB::commit();
$locked = $this->responseXML->addChild('locked');
$locked['wait'] = $this->getWaitTime($this->sessionID);
$this->end();
}
Zotero_DB::commit();
$queue = true;
if (Z_ENV_TESTING_SITE && !empty($_GET['noqueue'])) {
$queue = false;
}
// TEMP
$cacheKeyExtra = (!empty($_POST['ft']) ? json_encode($_POST['ft']) : "") . (!empty($_POST['ftkeys']) ? json_encode($_POST['ftkeys']) : "");
// If we have a cached response, return that
try {
$startedTimestamp = microtime(true);
$cached = Zotero_Sync::getCachedDownload($this->userID, $lastsync, $this->apiVersion, $cacheKeyExtra);
// Not locked, so clear wait index
$this->clearWaitTime($this->sessionID);
if ($cached) {
$this->responseXML = simplexml_load_string($cached, "SimpleXMLElement", LIBXML_COMPACT | LIBXML_PARSEHUGE);
// TEMP
if (!$this->responseXML) {
error_log("Invalid cached XML data -- stripping control characters");
// Strip control characters in XML data
$cached = preg_replace('/[\\x00-\\x08\\x0B\\x0C\\x0E-\\x1F\\x7F]/', '', $cached);
$this->responseXML = simplexml_load_string($cached, "SimpleXMLElement", LIBXML_COMPACT | LIBXML_PARSEHUGE);
}
$duration = round((double) microtime(true) - $startedTimestamp, 2);
Zotero_Sync::logDownload($this->userID, round($lastsync), strlen($cached), $this->ipAddress ? $this->ipAddress : 0, 0, $duration, $duration, (int) (!$this->responseXML));
StatsD::increment("sync.process.download.cache.hit");
if (!$this->responseXML) {
$msg = "Error parsing cached XML for user " . $this->userID;
error_log($msg);
$this->handleUpdatedError(new Exception($msg));
}
$this->end();
}
} catch (Exception $e) {
$msg = $e->getMessage();
if (strpos($msg, "Too many connections") !== false) {
$msg = "'Too many connections' from MySQL";
} else {
$msg = "'{$msg}'";
}
Z_Core::logError("Warning: {$msg} getting cached download");
StatsD::increment("sync.process.download.cache.error");
}
try {
$num = Zotero_Items::countUpdated($this->userID, $lastsync, 5);
} catch (Exception $e) {
// We can get a MySQL lock timeout here if the upload starts
// after the write lock check above but before we get here
$this->handleUpdatedError($e);
}
// If nothing updated, or if just a few objects and processing is enabled, process synchronously
if ($num == 0 || $num < 5 && Z_CONFIG::$PROCESSORS_ENABLED) {
$queue = false;
}
$params = [];
if (isset($_POST['ft'])) {
$params['ft'] = $_POST['ft'];
}
if (isset($_POST['ftkeys'])) {
$queue = true;
$params['ftkeys'] = $_POST['ftkeys'];
}
if ($queue) {
Zotero_Sync::queueDownload($this->userID, $this->sessionID, $lastsync, $this->apiVersion, $num, $params);
try {
Zotero_Processors::notifyProcessors('download');
} catch (Exception $e) {
Z_Core::logError($e);
}
$locked = $this->responseXML->addChild('locked');
$locked['wait'] = 1000;
} else {
try {
Zotero_Sync::processDownload($this->userID, $lastsync, $doc, $params);
$this->responseXML = simplexml_import_dom($doc);
StatsD::increment("sync.process.download.immediate.success");
} catch (Exception $e) {
StatsD::increment("sync.process.download.immediate.error");
$this->handleUpdatedError($e);
}
}
$this->end();
}
throw new Exception("Unexpected session result {$result}");
}