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<?php
/**
* SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\DAV\CalDAV\Publishing;
use OCA\DAV\CalDAV\Calendar;
use OCA\DAV\CalDAV\Publishing\Xml\Publisher;
use OCP\IConfig;
use OCP\IURLGenerator;
use Sabre\CalDAV\Xml\Property\AllowedSharingModes;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\INode;
use Sabre\DAV\PropFind;
use Sabre\DAV\Server;
use Sabre\DAV\ServerPlugin;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
class PublishPlugin extends ServerPlugin {
public const NS_CALENDARSERVER = 'http://calendarserver.org/ns/';
/**
* Reference to SabreDAV server object.
*
* @var \Sabre\DAV\Server
*/
protected $server;
/**
* PublishPlugin constructor.
*
* @param IConfig $config
* @param IURLGenerator $urlGenerator
*/
public function __construct(
/**
* Config instance to get instance secret.
*/
protected IConfig $config,
/**
* URL Generator for absolute URLs.
*/
protected IURLGenerator $urlGenerator,
) {
}
/**
* 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[]
*/
public function getFeatures() {
// May have to be changed to be detected
return ['oc-calendar-publishing', 'calendarserver-sharing'];
}
/**
* 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 'oc-calendar-publishing';
}
/**
* 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
*/
public function initialize(Server $server) {
$this->server = $server;
$this->server->on('method:POST', [$this, 'httpPost']);
$this->server->on('propFind', [$this, 'propFind']);
}
public function propFind(PropFind $propFind, INode $node) {
if ($node instanceof Calendar) {
$propFind->handle('{' . self::NS_CALENDARSERVER . '}publish-url', function () use ($node) {
if ($node->getPublishStatus()) {
// We return the publish-url only if the calendar is published.
$token = $node->getPublishStatus();
$publishUrl = $this->urlGenerator->getAbsoluteURL($this->server->getBaseUri() . 'public-calendars/') . $token;
return new Publisher($publishUrl, true);
}
});
$propFind->handle('{' . self::NS_CALENDARSERVER . '}allowed-sharing-modes', function () use ($node) {
$canShare = (!$node->isSubscription() && $node->canWrite());
$canPublish = (!$node->isSubscription() && $node->canWrite());
if ($this->config->getAppValue('dav', 'limitAddressBookAndCalendarSharingToOwner', 'no') === 'yes') {
$canShare = $canShare && ($node->getOwner() === $node->getPrincipalURI());
$canPublish = $canPublish && ($node->getOwner() === $node->getPrincipalURI());
}
return new AllowedSharingModes($canShare, $canPublish);
});
}
}
/**
* We intercept this to handle POST requests on calendars.
*
* @param RequestInterface $request
* @param ResponseInterface $response
*
* @return void|bool
*/
public function httpPost(RequestInterface $request, ResponseInterface $response) {
$path = $request->getPath();
// Only handling xml
$contentType = (string)$request->getHeader('Content-Type');
if (!str_contains($contentType, 'application/xml') && !str_contains($contentType, 'text/xml')) {
return;
}
// Making sure the node exists
try {
$node = $this->server->tree->getNodeForPath($path);
} catch (NotFound $e) {
return;
}
$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);
$this->server->xml->parse($requestBody, $request->getUrl(), $documentType);
switch ($documentType) {
case '{' . self::NS_CALENDARSERVER . '}publish-calendar':
// We can only deal with IShareableCalendar objects
if (!$node instanceof Calendar) {
return;
}
$this->server->transactionType = 'post-publish-calendar';
// Getting ACL info
$acl = $this->server->getPlugin('acl');
// If there's no ACL support, we allow everything
if ($acl) {
/** @var \Sabre\DAVACL\Plugin $acl */
$acl->checkPrivileges($path, '{DAV:}write');
$limitSharingToOwner = $this->config->getAppValue('dav', 'limitAddressBookAndCalendarSharingToOwner', 'no') === 'yes';
$isOwner = $acl->getCurrentUserPrincipal() === $node->getOwner();
if ($limitSharingToOwner && !$isOwner) {
return;
}
}
$node->setPublishStatus(true);
// iCloud sends back the 202, so we will too.
$response->setStatus(202);
// Adding this because sending a response body may cause issues,
// and I wanted some type of indicator the response was handled.
$response->setHeader('X-Sabre-Status', 'everything-went-well');
// Breaking the event chain
return false;
case '{' . self::NS_CALENDARSERVER . '}unpublish-calendar':
// We can only deal with IShareableCalendar objects
if (!$node instanceof Calendar) {
return;
}
$this->server->transactionType = 'post-unpublish-calendar';
// Getting ACL info
$acl = $this->server->getPlugin('acl');
// If there's no ACL support, we allow everything
if ($acl) {
/** @var \Sabre\DAVACL\Plugin $acl */
$acl->checkPrivileges($path, '{DAV:}write');
$limitSharingToOwner = $this->config->getAppValue('dav', 'limitAddressBookAndCalendarSharingToOwner', 'no') === 'yes';
$isOwner = $acl->getCurrentUserPrincipal() === $node->getOwner();
if ($limitSharingToOwner && !$isOwner) {
return;
}
}
$node->setPublishStatus(false);
$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;
}
}
}
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