/lib/Sabre/DAV/Sync/Plugin.php
PHP | 342 lines | 159 code | 73 blank | 110 comment | 22 complexity | e24403490a0e26e5c257652ebf1b7f53 MD5 | raw file
Possible License(s): BSD-3-Clause
- <?php
- namespace Sabre\DAV\Sync;
- use Sabre\DAV;
- /**
- * This plugin all WebDAV-sync capabilities to the Server.
- *
- * WebDAV-sync is defined by rfc6578
- *
- * The sync capabilities only work with collections that implement
- * Sabreu\DAV\Sync\ISyncCollection.
- *
- * @copyright Copyright (C) 2007-2013 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
- class Plugin extends DAV\ServerPlugin {
- /**
- * Reference to server object
- *
- * @var DAV\Server
- */
- protected $server;
- const SYNCTOKEN_PREFIX = 'http://sabredav.org/ns/sync/';
- /**
- * Returns a plugin name.
- *
- * Using this name other plugins will be able to access other plugins
- * using \Sabre\DAV\Server::getPlugin
- *
- * @return string
- */
- public function getPluginName() {
- return 'sync';
- }
- /**
- * Initializes the plugin.
- *
- * This is when the plugin registers it's hooks.
- *
- * @param DAV\Server $server
- * @return void
- */
- public function initialize(DAV\Server $server) {
- $this->server = $server;
- $self = $this;
- $server->subscribeEvent('report', function($reportName, $dom, $uri) use ($self) {
- if ($reportName === '{DAV:}sync-collection') {
- $this->server->transactionType = 'report-sync-collection';
- $self->syncCollection($uri, $dom);
- return false;
- }
- });
- $server->subscribeEvent('beforeGetProperties', array($this, 'beforeGetProperties'));
- $server->subscribeEvent('validateTokens', array($this, 'validateTokens'));
- }
- /**
- * Returns a list of reports this plugin supports.
- *
- * This will be used in the {DAV:}supported-report-set property.
- * Note that you still need to subscribe to the 'report' event to actually
- * implement them
- *
- * @param string $uri
- * @return array
- */
- public function getSupportedReportSet($uri) {
- $node = $this->server->tree->getNodeForPath($uri);
- if ($node instanceof ISyncCollection && $node->getSyncToken()) {
- return array(
- '{DAV:}sync-collection',
- );
- }
- return array();
- }
- /**
- * This method handles the {DAV:}sync-collection HTTP REPORT.
- *
- * @param string $uri
- * @param \DOMDocument $dom
- * @return void
- */
- public function syncCollection($uri, \DOMDocument $dom) {
- // rfc3253 specifies 0 is the default value for Depth:
- $depth = $this->server->getHTTPDepth(0);
- list(
- $syncToken,
- $syncLevel,
- $limit,
- $properties
- ) = $this->parseSyncCollectionRequest($dom, $depth);
- // Getting the data
- $node = $this->server->tree->getNodeForPath($uri);
- if (!$node instanceof ISyncCollection) {
- throw new DAV\Exception\ReportNotSupported('The {DAV:}sync-collection REPORT is not supported on this url.');
- }
- $token = $node->getSyncToken();
- if (!$token) {
- throw new DAV\Exception\ReportNotSupported('No sync information is available at this node');
- }
- if (!is_null($syncToken)) {
- // Sync-token must start with our prefix
- if (substr($syncToken, 0, strlen(self::SYNCTOKEN_PREFIX)) !== self::SYNCTOKEN_PREFIX) {
- throw new DAV\Exception\InvalidSyncToken('Invalid or unknown sync token');
- }
- $syncToken = substr($syncToken, strlen(self::SYNCTOKEN_PREFIX));
- }
- $changeInfo = $node->getChanges($syncToken, $syncLevel, $limit);
- if (is_null($changeInfo)) {
- throw new DAV\Exception\InvalidSyncToken('Invalid or unknown sync token');
- }
- // Encoding the response
- $this->sendSyncCollectionResponse(
- $changeInfo['syncToken'],
- $uri,
- $changeInfo['added'],
- $changeInfo['modified'],
- $changeInfo['deleted'],
- $properties
- );
- }
- /**
- * Parses the {DAV:}sync-collection REPORT request body.
- *
- * This method returns an array with 3 values:
- * 0 - the value of the {DAV:}sync-token element
- * 1 - the value of the {DAV:}sync-level element
- * 2 - The value of the {DAV:}limit element
- * 3 - A list of requested properties
- *
- * @param \DOMDocument $dom
- * @param int $depth
- * @return void
- */
- protected function parseSyncCollectionRequest(\DOMDocument $dom, $depth) {
- $xpath = new \DOMXPath($dom);
- $xpath->registerNamespace('d','urn:DAV');
- $syncToken = $xpath->query("//d:sync-token");
- if ($syncToken->length !== 1) {
- throw new DAV\Exception\BadRequest('You must specify a {DAV:}sync-token element, and it must appear exactly once');
- }
- $syncToken = $syncToken->item(0)->nodeValue;
- // Initial sync
- if (!$syncToken) $syncToken = null;
- $syncLevel = $xpath->query("//d:sync-level");
- if ($syncLevel->length === 0) {
- // In case there was no sync-level, it could mean that we're dealing
- // with an old client. For these we must use the depth header
- // instead.
- $syncLevel = $depth;
- } else {
- $syncLevel = $syncLevel->item(0)->nodeValue;
- if ($syncLevel === 'infinite') {
- $syncLevel = DAV\Server::DEPTH_INFINITY;
- }
- }
- $limit = $xpath->query("//d:limit/d:nresults");
- if ($limit->length === 0) {
- $limit = null;
- } else {
- $limit = $limit->item(0)->nodeValue;
- }
- $prop = $xpath->query('d:prop');
- if ($prop->length !== 1) {
- throw new DAV\Exception\BadRequest('The {DAV:}sync-collection must contain extactly 1 {DAV:}prop');
- }
- $properties = array_keys(
- DAV\XMLUtil::parseProperties($dom->documentElement)
- );
- return array(
- $syncToken,
- $syncLevel,
- $limit,
- $properties,
- );
- }
- /**
- * Sends the response to a sync-collection request.
- *
- * @param string $syncToken
- * @param string $collectionUrl
- * @param array $added
- * @param array $modified
- * @param array $deleted
- * @param array $properties
- * @return void
- */
- protected function sendSyncCollectionResponse($syncToken, $collectionUrl, array $added, array $modified, array $deleted, array $properties) {
- $dom = new \DOMDocument('1.0','utf-8');
- $dom->formatOutput = true;
- $multiStatus = $dom->createElement('d:multistatus');
- $dom->appendChild($multiStatus);
- // Adding in default namespaces
- foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
- $multiStatus->setAttribute('xmlns:' . $prefix,$namespace);
- }
- $fullPaths = [];
- // Pre-fetching children, if this is possible.
- foreach(array_merge($added, $modified) as $item) {
- $fullPath = $collectionUrl . '/' . $item;
- $fullPaths[] = $fullPath;
- }
- foreach($this->server->getPropertiesForMultiplePaths($fullPaths, $properties) as $fullPath => $props) {
- // The 'Property_Response' class is responsible for generating a
- // single {DAV:}response xml element.
- $response = new DAV\Property\Response($fullPath, $props);
- $response->serialize($this->server, $multiStatus);
- }
- // Deleted items also show up as 'responses'. They have no properties,
- // and a single {DAV:}status element set as 'HTTP/1.1 404 Not Found'.
- foreach($deleted as $item) {
- $fullPath = $collectionUrl . '/' . $item;
- $response = new DAV\Property\Response($fullPath, array(), 404);
- $response->serialize($this->server, $multiStatus);
- }
- $syncToken = $dom->createElement('d:sync-token', self::SYNCTOKEN_PREFIX . $syncToken);
- $multiStatus->appendChild($syncToken);
- $this->server->httpResponse->sendStatus(207);
- $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
- $this->server->httpResponse->sendBody($dom->saveXML());
- }
- /**
- * This method is triggered whenever properties are requested for a node.
- * We intercept this to see if we can must return a {DAV:}sync-token.
- *
- * @param string $path
- * @param DAV\INode $node
- * @param array $requestedProperties
- * @param array $returnedProperties
- * @return void
- */
- public function beforeGetProperties($path, DAV\INode $node, array &$requestedProperties, array &$returnedProperties) {
- if (!in_array('{DAV:}sync-token', $requestedProperties)) {
- return;
- }
- if ($node instanceof ISyncCollection && $token = $node->getSyncToken()) {
- // Unsetting the property from requested properties.
- $index = array_search('{DAV:}sync-token', $requestedProperties);
- unset($requestedProperties[$index]);
- $returnedProperties[200]['{DAV:}sync-token'] = self::SYNCTOKEN_PREFIX . $token;
- }
- }
- /**
- * The validateTokens event is triggered before every request.
- *
- * It's a moment where this plugin can check all the supplied lock tokens
- * in the If: header, and check if they are valid.
- *
- * @param mixed $conditions
- * @return void
- */
- public function validateTokens( &$conditions ) {
- foreach($conditions as $kk=>$condition) {
- foreach($condition['tokens'] as $ii=>$token) {
- // Sync-tokens must always start with our designated prefix.
- if (substr($token['token'], 0, strlen(self::SYNCTOKEN_PREFIX)) !== self::SYNCTOKEN_PREFIX) {
- continue;
- }
- // Checking if the token is a match.
- $node = $this->server->tree->getNodeForPath($condition['uri']);
- if (
- $node instanceof ISyncCollection &&
- $node->getSyncToken() == substr($token['token'], strlen(self::SYNCTOKEN_PREFIX))
- ) {
- $conditions[$kk]['tokens'][$ii]['validToken'] = true;
- }
- }
- }
- }
- }