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<?php
namespace OCA\DAV\CardDAV\Sharing;
use OCA\DAV\Connector\Sabre\Auth;
use OCP\IRequest;
use Sabre\DAV\Exception\BadRequest;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\Server;
use Sabre\DAV\ServerPlugin;
use Sabre\DAV\XMLUtil;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
class Plugin extends ServerPlugin {
public function __construct(Auth $authBackEnd, IRequest $request) {
$this->auth = $authBackEnd;
$this->request = $request;
}
/**
* Reference to SabreDAV server object.
*
* @var \Sabre\DAV\Server
*/
protected $server;
/**
* This method should return a list of server-features.
*
* This is for example 'versioning' and is added to the DAV: header
* in an OPTIONS response.
*
* @return string[]
*/
function getFeatures() {
return ['oc-addressbook-sharing'];
}
/**
* Returns a plugin name.
*
* Using this name other plugins will be able to access other plugins
* using Sabre\DAV\Server::getPlugin
*
* @return string
*/
function getPluginName() {
return 'carddav-sharing';
}
/**
* This initializes the plugin.
*
* This function is called by Sabre\DAV\Server, after
* addPlugin is called.
*
* This method should set up the required event subscriptions.
*
* @param Server $server
* @return void
*/
function initialize(Server $server) {
$this->server = $server;
$server->resourceTypeMapping['OCA\\DAV\CardDAV\\ISharedAddressbook'] = '{' . \Sabre\CardDAV\Plugin::NS_CARDDAV . '}shared';
$this->server->on('method:POST', [$this, 'httpPost']);
}
/**
* We intercept this to handle POST requests on calendars.
*
* @param RequestInterface $request
* @param ResponseInterface $response
* @return null|false
*/
function httpPost(RequestInterface $request, ResponseInterface $response) {
$path = $request->getPath();
// Only handling xml
$contentType = $request->getHeader('Content-Type');
if (strpos($contentType, 'application/xml') === false && strpos($contentType, 'text/xml') === false)
return;
// Making sure the node exists
try {
$node = $this->server->tree->getNodeForPath($path);
} catch (NotFound $e) {
return;
}
// CSRF protection
$this->protectAgainstCSRF();
$requestBody = $request->getBodyAsString();
// If this request handler could not deal with this POST request, it
// will return 'null' and other plugins get a chance to handle the
// request.
//
// However, we already requested the full body. This is a problem,
// because a body can only be read once. This is why we preemptively
// re-populated the request body with the existing data.
$request->setBody($requestBody);
$dom = XMLUtil::loadDOMDocument($requestBody);
$documentType = XMLUtil::toClarkNotation($dom->firstChild);
switch ($documentType) {
// Dealing with the 'share' document, which modified invitees on a
// calendar.
case '{' . \Sabre\CardDAV\Plugin::NS_CARDDAV . '}share' :
// We can only deal with IShareableCalendar objects
if (!$node instanceof IShareableAddressBook) {
return;
}
$this->server->transactionType = 'post-calendar-share';
// Getting ACL info
$acl = $this->server->getPlugin('acl');
// If there's no ACL support, we allow everything
if ($acl) {
$acl->checkPrivileges($path, '{DAV:}write');
}
$mutations = $this->parseShareRequest($dom);
$node->updateShares($mutations[0], $mutations[1]);
$response->setStatus(200);
// Adding this because sending a response body may cause issues,
// and I wanted some type of indicator the response was handled.
$response->setHeader('X-Sabre-Status', 'everything-went-well');
// Breaking the event chain
return false;
}
}
/**
* Parses the 'share' POST request.
*
* This method returns an array, containing two arrays.
* The first array is a list of new sharees. Every element is a struct
* containing a:
* * href element. (usually a mailto: address)
* * commonName element (often a first and lastname, but can also be
* false)
* * readOnly (true or false)
* * summary (A description of the share, can also be false)
*
* The second array is a list of sharees that are to be removed. This is
* just a simple array with 'hrefs'.
*
* @param \DOMDocument $dom
* @return array
*/
function parseShareRequest(\DOMDocument $dom) {
$xpath = new \DOMXPath($dom);
$xpath->registerNamespace('cs', \Sabre\CardDAV\Plugin::NS_CARDDAV);
$xpath->registerNamespace('d', 'urn:DAV');
$set = [];
$elems = $xpath->query('cs:set');
for ($i = 0; $i < $elems->length; $i++) {
$xset = $elems->item($i);
$set[] = [
'href' => $xpath->evaluate('string(d:href)', $xset),
'commonName' => $xpath->evaluate('string(cs:common-name)', $xset),
'summary' => $xpath->evaluate('string(cs:summary)', $xset),
'readOnly' => $xpath->evaluate('boolean(cs:read)', $xset) !== false
];
}
$remove = [];
$elems = $xpath->query('cs:remove');
for ($i = 0; $i < $elems->length; $i++) {
$xremove = $elems->item($i);
$remove[] = $xpath->evaluate('string(d:href)', $xremove);
}
return [$set, $remove];
}
private function protectAgainstCSRF() {
$user = $this->auth->getCurrentUser();
if ($this->auth->isDavAuthenticated($user)) {
return true;
}
if ($this->request->passesCSRFCheck()) {
return true;
}
throw new BadRequest();
}
}
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