<?php
namespace Sabre\CalDAV;
use DateTimeZone;
use Sabre\DAV;
use Sabre\DAV\Exception\BadRequest;
use Sabre\DAV\INode;
use Sabre\DAV\MkCol;
use Sabre\DAV\Xml\Property\LocalHref;
use Sabre\DAVACL;
use Sabre\HTTP;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
use Sabre\Uri;
use Sabre\VObject;
/**
* CalDAV plugin
*
* This plugin provides functionality added by CalDAV (RFC 4791)
* It implements new reports, and the MKCALENDAR method.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class Plugin extends DAV\ServerPlugin {
/**
* This is the official CalDAV namespace
*/
const NS_CALDAV = 'urn:ietf:params:xml:ns:caldav';
/**
* This is the namespace for the proprietary calendarserver extensions
*/
const NS_CALENDARSERVER = 'http://calendarserver.org/ns/';
/**
* The hardcoded root for calendar objects. It is unfortunate
* that we're stuck with it, but it will have to do for now
*/
const CALENDAR_ROOT = 'calendars';
/**
* Reference to server object
*
* @var DAV\Server
*/
protected $server;
/**
* The default PDO storage uses a MySQL MEDIUMBLOB for iCalendar data,
* which can hold up to 2^24 = 16777216 bytes. This is plenty. We're
* capping it to 10M here.
*/
protected $maxResourceSize = 10000000;
/**
* Use this method to tell the server this plugin defines additional
* HTTP methods.
*
* This method is passed a uri. It should only return HTTP methods that are
* available for the specified uri.
*
* @param string $uri
* @return array
*/
function getHTTPMethods($uri) {
// The MKCALENDAR is only available on unmapped uri's, whose
// parents extend IExtendedCollection
list($parent, $name) = Uri\split($uri);
$node = $this->server->tree->getNodeForPath($parent);
if ($node instanceof DAV\IExtendedCollection) {
try {
$node->getChild($name);
} catch (DAV\Exception\NotFound $e) {
return ['MKCALENDAR'];
}
}
return [];
}
/**
* Returns the path to a principal's calendar home.
*
* The return url must not end with a slash.
* This function should return null in case a principal did not have
* a calendar home.
*
* @param string $principalUrl
* @return string
*/
function getCalendarHomeForPrincipal($principalUrl) {
// The default behavior for most sabre/dav servers is that there is a
// principals root node, which contains users directly under it.
//
// This function assumes that there are two components in a principal
// path. If there's more, we don't return a calendar home. This
// excludes things like the calendar-proxy-read principal (which it
// should).
$parts = explode('/', trim($principalUrl, '/'));
if (count($parts) !== 2) return;
if ($parts[0] !== 'principals') return;
return self::CALENDAR_ROOT . '/' . $parts[1];
}
/**
* Returns a list of features for the DAV: HTTP header.
*
* @return array
*/
function getFeatures() {
return ['calendar-access', 'calendar-proxy'];
}
/**
* Returns a plugin name.
*
* Using this name other plugins will be able to access other plugins
* using DAV\Server::getPlugin
*
* @return string
*/
function getPluginName() {
return 'caldav';
}
/**
* 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 $uri
* @return array
*/
function getSupportedReportSet($uri) {
$node = $this->server->tree->getNodeForPath($uri);
$reports = [];
if ($node instanceof ICalendarObjectContainer || $node instanceof ICalendarObject) {
$reports[] = '{' . self::NS_CALDAV . '}calendar-multiget';
$reports[] = '{' . self::NS_CALDAV . '}calendar-query';
}
if ($node instanceof ICalendar) {
$reports[] = '{' . self::NS_CALDAV . '}free-busy-query';
}
// iCal has a bug where it assumes that sync support is enabled, only
// if we say we support it on the calendar-home, even though this is
// not actually the case.
if ($node instanceof CalendarHome && $this->server->getPlugin('sync')) {
$reports[] = '{DAV:}sync-collection';
}
return $reports;
}
/**
* Initializes the plugin
*
* @param DAV\Server $server
* @return void
*/
function initialize(DAV\Server $server) {
$this->server = $server;
$server->on('method:MKCALENDAR', [$this, 'httpMkCalendar']);
$server->on('report', [$this, 'report']);
$server->on('propFind', [$this, 'propFind']);
$server->on('onHTMLActionsPanel', [$this, 'htmlActionsPanel']);
$server->on('beforeCreateFile', [$this, 'beforeCreateFile']);
$server->on('beforeWriteContent', [$this, 'beforeWriteContent']);
$server->on('afterMethod:GET', [$this, 'httpAfterGET']);
$server->on('getSupportedPrivilegeSet', [$this, 'getSupportedPrivilegeSet']);
$server->xml->namespaceMap[self::NS_CALDAV] = 'cal';
$server->xml->namespaceMap[self::NS_CALENDARSERVER] = 'cs';
$server->xml->elementMap['{' . self::NS_CALDAV . '}supported-calendar-component-set'] = 'Sabre\\CalDAV\\Xml\\Property\\SupportedCalendarComponentSet';
$server->xml->elementMap['{' . self::NS_CALDAV . '}calendar-query'] = 'Sabre\\CalDAV\\Xml\\Request\\CalendarQueryReport';
$server->xml->elementMap['{' . self::NS_CALDAV . '}calendar-multiget'] = 'Sabre\\CalDAV\\Xml\\Request\\CalendarMultiGetReport';
$server->xml->elementMap['{' . self::NS_CALDAV . '}free-busy-query'] = 'Sabre\\CalDAV\\Xml\\Request\\FreeBusyQueryReport';
$server->xml->elementMap['{' . self::NS_CALDAV . '}mkcalendar'] = 'Sabre\\CalDAV\\Xml\\Request\\MkCalendar';
$server->xml->elementMap['{' . self::NS_CALDAV . '}schedule-calendar-transp'] = 'Sabre\\CalDAV\\Xml\\Property\\ScheduleCalendarTransp';
$server->xml->elementMap['{' . self::NS_CALDAV . '}supported-calendar-component-set'] = 'Sabre\\CalDAV\\Xml\\Property\\SupportedCalendarComponentSet';
$server->resourceTypeMapping['\\Sabre\\CalDAV\\ICalendar'] = '{urn:ietf:params:xml:ns:caldav}calendar';
$server->resourceTypeMapping['\\Sabre\\CalDAV\\Principal\\IProxyRead'] = '{http://calendarserver.org/ns/}calendar-proxy-read';
$server->resourceTypeMapping['\\Sabre\\CalDAV\\Principal\\IProxyWrite'] = '{http://calendarserver.org/ns/}calendar-proxy-write';
array_push($server->protectedProperties,
'{' . self::NS_CALDAV . '}supported-calendar-component-set',
'{' . self::NS_CALDAV . '}supported-calendar-data',
'{' . self::NS_CALDAV . '}max-resource-size',
'{' . self::NS_CALDAV . '}min-date-time',
'{' . self::NS_CALDAV . '}max-date-time',
'{' . self::NS_CALDAV . '}max-instances',
'{' . self::NS_CALDAV . '}max-attendees-per-instance',
'{' . self::NS_CALDAV . '}calendar-home-set',
'{' . self::NS_CALDAV . '}supported-collation-set',
'{' . self::NS_CALDAV . '}calendar-data',
// CalendarServer extensions
'{' . self::NS_CALENDARSERVER . '}getctag',
'{' . self::NS_CALENDARSERVER . '}calendar-proxy-read-for',
'{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for'
);
if ($aclPlugin = $server->getPlugin('acl')) {
$aclPlugin->principalSearchPropertySet['{' . self::NS_CALDAV . '}calendar-user-address-set'] = 'Calendar address';
}
}
/**
* This functions handles REPORT requests specific to CalDAV
*
* @param string $reportName
* @param mixed $report
* @param mixed $path
* @return bool
*/
function report($reportName, $report, $path) {
switch ($reportName) {
case '{' . self::NS_CALDAV . '}calendar-multiget' :
$this->server->transactionType = 'report-calendar-multiget';
$this->calendarMultiGetReport($report);
return false;
case '{' . self::NS_CALDAV . '}calendar-query' :
$this->server->transactionType = 'report-calendar-query';
$this->calendarQueryReport($report);
return false;
case '{' . self::NS_CALDAV . '}free-busy-query' :
$this->server->transactionType = 'report-free-busy-query';
$this->freeBusyQueryReport($report);
return false;
}
}
/**
* This function handles the MKCALENDAR HTTP method, which creates
* a new calendar.
*
* @param RequestInterface $request
* @param ResponseInterface $response
* @return bool
*/
function httpMkCalendar(RequestInterface $request, ResponseInterface $response) {
$body = $request->getBodyAsString();
$path = $request->getPath();
$properties = [];
if ($body) {
try {
$mkcalendar = $this->server->xml->expect(
'{urn:ietf:params:xml:ns:caldav}mkcalendar',
$body
);
} catch (\Sabre\Xml\ParseException $e) {
throw new BadRequest($e->getMessage(), null, $e);
}
$properties = $mkcalendar->getProperties();
}
// iCal abuses MKCALENDAR since iCal 10.9.2 to create server-stored
// subscriptions. Before that it used MKCOL which was the correct way
// to do this.
//
// If the body had a {DAV:}resourcetype, it means we stumbled upon this
// request, and we simply use it instead of the pre-defined list.
if (isset($properties['{DAV:}resourcetype'])) {
$resourceType = $properties['{DAV:}resourcetype']->getValue();
} else {
$resourceType = ['{DAV:}collection','{urn:ietf:params:xml:ns:caldav}calendar'];
}
$this->server->createCollection($path, new MkCol($resourceType, $properties));
$response->setStatus(201);
$response->setHeader('Content-Length', 0);
// This breaks the method chain.
return false;
}
/**
* PropFind
*
* This method handler is invoked before any after properties for a
* resource are fetched. This allows us to add in any CalDAV specific
* properties.
*
* @param DAV\PropFind $propFind
* @param DAV\INode $node
* @return void
*/
function propFind(DAV\PropFind $propFind, DAV\INode $node) {
$ns = '{' . self::NS_CALDAV . '}';
if ($node instanceof ICalendarObjectContainer) {
$propFind->handle($ns . 'max-resource-size', $this->maxResourceSize);
$propFind->handle($ns . 'supported-calendar-data', function() {
return new Xml\Property\SupportedCalendarData();
});
$propFind->handle($ns . 'supported-collation-set', function() {
return new Xml\Property\SupportedCollationSet();
});
}
if ($node instanceof DAVACL\IPrincipal) {
$principalUrl = $node->getPrincipalUrl();
$propFind->handle('{' . self::NS_CALDAV . '}calendar-home-set', function() use ($principalUrl) {
$calendarHomePath = $this->getCalendarHomeForPrincipal($principalUrl);
if (is_null($calendarHomePath)) return null;
return new LocalHref($calendarHomePath . '/');
});
// The calendar-user-address-set property is basically mapped to
// the {DAV:}alternate-URI-set property.
$propFind->handle('{' . self::NS_CALDAV . '}calendar-user-address-set', function() use ($node) {
$addresses = $node->getAlternateUriSet();
$addresses[] = $this->server->getBaseUri() . $node->getPrincipalUrl() . '/';
return new LocalHref($addresses);
});
// For some reason somebody thought it was a good idea to add
// another one of these properties. We're supporting it too.
$propFind->handle('{' . self::NS_CALENDARSERVER . '}email-address-set', function() use ($node) {
$addresses = $node->getAlternateUriSet();
$emails = [];
foreach ($addresses as $address) {
if (substr($address, 0, 7) === 'mailto:') {
$emails[] = substr($address, 7);
}
}
return new Xml\Property\EmailAddressSet($emails);
});
// These two properties are shortcuts for ical to easily find
// other principals this principal has access to.
$propRead = '{' . self::NS_CALENDARSERVER . '}calendar-proxy-read-for';
$propWrite = '{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for';
if ($propFind->getStatus($propRead) === 404 || $propFind->getStatus($propWrite) === 404) {
$aclPlugin = $this->server->getPlugin('acl');
$membership = $aclPlugin->getPrincipalMembership($propFind->getPath());
$readList = [];
$writeList = [];
foreach ($membership as $group) {
$groupNode = $this->server->tree->getNodeForPath($group);
$listItem = Uri\split($group)[0] . '/';
// If the node is either ap proxy-read or proxy-write
// group, we grab the parent principal and add it to the
// list.
if ($groupNode instanceof Principal\IProxyRead) {
$readList[] = $listItem;
}
if ($groupNode instanceof Principal\IProxyWrite) {
$writeList[] = $listItem;
}
}
$propFind->set($propRead, new LocalHref($readList));
$propFind->set($propWrite, new LocalHref($writeList));
}
} // instanceof IPrincipal
if ($node instanceof ICalendarObject) {
// The calendar-data property is not supposed to be a 'real'
// property, but in large chunks of the spec it does act as such.
// Therefore we simply expose it as a property.
$propFind->handle('{' . self::NS_CALDAV . '}calendar-data', function() use ($node) {
$val = $node->get();
if (is_resource($val))
$val = stream_get_contents($val);
// Taking out \r to not screw up the xml output
return str_replace("\r", "", $val);
});
}
}
/**
* This function handles the calendar-multiget REPORT.
*
* This report is used by the client to fetch the content of a series
* of urls. Effectively avoiding a lot of redundant requests.
*
* @param CalendarMultiGetReport $report
* @return void
*/
function calendarMultiGetReport($report) {
$needsJson = $report->contentType === 'application/calendar+json';
$timeZones = [];
$propertyList = [];
$paths = array_map(
[$this->server, 'calculateUri'],
$report->hrefs
);
foreach ($this->server->getPropertiesForMultiplePaths($paths, $report->properties) as $uri => $objProps) {
if (($needsJson || $report->expand) && isset($objProps[200]['{' . self::NS_CALDAV . '}calendar-data'])) {
$vObject = VObject\Reader::read($objProps[200]['{' . self::NS_CALDAV . '}calendar-data']);
if ($report->expand) {
// We're expanding, and for that we need to figure out the
// calendar's timezone.
list($calendarPath) = Uri\split($uri);
if (!isset($timeZones[$calendarPath])) {
// Checking the calendar-timezone property.
$tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
$tzResult = $this->server->getProperties($calendarPath, [$tzProp]);
if (isset($tzResult[$tzProp])) {
// This property contains a VCALENDAR with a single
// VTIMEZONE.
$vtimezoneObj = VObject\Reader::read($tzResult[$tzProp]);
$timeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
} else {
// Defaulting to UTC.
$timeZone = new DateTimeZone('UTC');
}
$timeZones[$calendarPath] = $timeZone;
}
$vObject = $vObject->expand($report->expand['start'], $report->expand['end'], $timeZones[$calendarPath]);
}
if ($needsJson) {
$objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = json_encode($vObject->jsonSerialize());
} else {
$objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
}
// Destroy circular references so PHP will garbage collect the
// object.
$vObject->destroy();
}
$propertyList[] = $objProps;
}
$prefer = $this->server->getHTTPPrefer();
$this->server->httpResponse->setStatus(207);
$this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
$this->server->httpResponse->setHeader('Vary', 'Brief,Prefer');
$this->server->httpResponse->setBody($this->server->generateMultiStatus($propertyList, $prefer['return'] === 'minimal'));
}
/**
* This function handles the calendar-query REPORT
*
* This report is used by clients to request calendar objects based on
* complex conditions.
*
* @param Xml\Request\CalendarQueryReport $report
* @return void
*/
function calendarQueryReport($report) {
$path = $this->server->getRequestUri();
$needsJson = $report->contentType === 'application/calendar+json';
$node = $this->server->tree->getNodeForPath($this->server->getRequestUri());
$depth = $this->server->getHTTPDepth(0);
// The default result is an empty array
$result = [];
$calendarTimeZone = null;
if ($report->expand) {
// We're expanding, and for that we need to figure out the
// calendar's timezone.
$tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
$tzResult = $this->server->getProperties($path, [$tzProp]);
if (isset($tzResult[$tzProp])) {
// This property contains a VCALENDAR with a single
// VTIMEZONE.
$vtimezoneObj = VObject\Reader::read($tzResult[$tzProp]);
$calendarTimeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
// Destroy circular references so PHP will garbage collect the
// object.
$vtimezoneObj->destroy();
} else {
// Defaulting to UTC.
$calendarTimeZone = new DateTimeZone('UTC');
}
}
// The calendarobject was requested directly. In this case we handle
// this locally.
if ($depth == 0 && $node instanceof ICalendarObject) {
$requestedCalendarData = true;
$requestedProperties = $report->properties;
if (!in_array('{urn:ietf:params:xml:ns:caldav}calendar-data', $requestedProperties)) {
// We always retrieve calendar-data, as we need it for filtering.
$requestedProperties[] = '{urn:ietf:params:xml:ns:caldav}calendar-data';
// If calendar-data wasn't explicitly requested, we need to remove
// it after processing.
$requestedCalendarData = false;
}
$properties = $this->server->getPropertiesForPath(
$path,
$requestedProperties,
0
);
// This array should have only 1 element, the first calendar
// object.
$properties = current($properties);
// If there wasn't any calendar-data returned somehow, we ignore
// this.
if (isset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data'])) {
$validator = new CalendarQueryValidator();
$vObject = VObject\Reader::read($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
if ($validator->validate($vObject, $report->filters)) {
// If the client didn't require the calendar-data property,
// we won't give it back.
if (!$requestedCalendarData) {
unset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
} else {
if ($report->expand) {
$vObject = $vObject->expand($report->expand['start'], $report->expand['end'], $calendarTimeZone);
}
if ($needsJson) {
$properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = json_encode($vObject->jsonSerialize());
} elseif ($report->expand) {
$properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
}
}
$result = [$properties];
}
// Destroy circular references so PHP will garbage collect the
// object.
$vObject->destroy();
}
}
if ($node instanceof ICalendarObjectContainer && $depth === 0) {
if (strpos($this->server->httpRequest->getHeader('User-Agent'), 'MSFT-') === 0) {
// Microsoft clients incorrectly supplied depth as 0, when it actually
// should have set depth to 1. We're implementing a workaround here
// to deal with this.
//
// This targets at least the following clients:
// Windows 10
// Windows Phone 8, 10
$depth = 1;
} else {
throw new BadRequest('A calendar-query REPORT on a calendar with a Depth: 0 is undefined. Set Depth to 1');
}
}
// If we're dealing with a calendar, the calendar itself is responsible
// for the calendar-query.
if ($node instanceof ICalendarObjectContainer && $depth == 1) {
$nodePaths = $node->calendarQuery($report->filters);
foreach ($nodePaths as $path) {
list($properties) =
$this->server->getPropertiesForPath($this->server->getRequestUri() . '/' . $path, $report->properties);
if (($needsJson || $report->expand)) {
$vObject = VObject\Reader::read($properties[200]['{' . self::NS_CALDAV . '}calendar-data']);
if ($report->expand) {
$vObject = $vObject->expand($report->expand['start'], $report->expand['end'], $calendarTimeZone);
}
if ($needsJson) {
$properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = json_encode($vObject->jsonSerialize());
} else {
$properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
}
// Destroy circular references so PHP will garbage collect the
// object.
$vObject->destroy();
}
$result[] = $properties;
}
}
$prefer = $this->server->getHTTPPrefer();
$this->server->httpResponse->setStatus(207);
$this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
$this->server->httpResponse->setHeader('Vary', 'Brief,Prefer');
$this->server->httpResponse->setBody($this->server->generateMultiStatus($result, $prefer['return'] === 'minimal'));
}
/**
* This method is responsible for parsing the request and generating the
* response for the CALDAV:free-busy-query REPORT.
*
* @param Xml\Request\FreeBusyQueryReport $report
* @return void
*/
protected function freeBusyQueryReport(Xml\Request\FreeBusyQueryReport $report) {
$uri = $this->server->getRequestUri();
$acl = $this->server->getPlugin('acl');
if ($acl) {
$acl->checkPrivileges($uri, '{' . self::NS_CALDAV . '}read-free-busy');
}
$calendar = $this->server->tree->getNodeForPath($uri);
if (!$calendar instanceof ICalendar) {
throw new DAV\Exception\NotImplemented('The free-busy-query REPORT is only implemented on calendars');
}
$tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
// Figuring out the default timezone for the calendar, for floating
// times.
$calendarProps = $this->server->getProperties($uri, [$tzProp]);
if (isset($calendarProps[$tzProp])) {
$vtimezoneObj = VObject\Reader::read($calendarProps[$tzProp]);
$calendarTimeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
// Destroy circular references so PHP will garbage collect the object.
$vtimezoneObj->destroy();
} else {
$calendarTimeZone = new DateTimeZone('UTC');
}
// Doing a calendar-query first, to make sure we get the most
// performance.
$urls = $calendar->calendarQuery([
'name' => 'VCALENDAR',
'comp-filters' => [
[
'name' => 'VEVENT',
'comp-filters' => [],
'prop-filters' => [],
'is-not-defined' => false,
'time-range' => [
'start' => $report->start,
'end' => $report->end,
],
],
],
'prop-filters' => [],
'is-not-defined' => false,
'time-range' => null,
]);
$objects = array_map(function($url) use ($calendar) {
$obj = $calendar->getChild($url)->get();
return $obj;
}, $urls);
$generator = new VObject\FreeBusyGenerator();
$generator->setObjects($objects);
$generator->setTimeRange($report->start, $report->end);
$generator->setTimeZone($calendarTimeZone);
$result = $generator->getResult();
$result = $result->serialize();
$this->server->httpResponse->setStatus(200);
$this->server->httpResponse->setHeader('Content-Type', 'text/calendar');
$this->server->httpResponse->setHeader('Content-Length', strlen($result));
$this->server->httpResponse->setBody($result);
}
/**
* This method is triggered before a file gets updated with new content.
*
* This plugin uses this method to ensure that CalDAV objects receive
* valid calendar data.
*
* @param string $path
* @param DAV\IFile $node
* @param resource $data
* @param bool $modified Should be set to true, if this event handler
* changed &$data.
* @return void
*/
function beforeWriteContent($path, DAV\IFile $node, &$data, &$modified) {
if (!$node instanceof ICalendarObject)
return;
// We're onyl interested in ICalendarObject nodes that are inside of a
// real calendar. This is to avoid triggering validation and scheduling
// for non-calendars (such as an inbox).
list($parent) = Uri\split($path);
$parentNode = $this->server->tree->getNodeForPath($parent);
if (!$parentNode instanceof ICalendar)
return;
$this->validateICalendar(
$data,
$path,
$modified,
$this->server->httpRequest,
$this->server->httpResponse,
false
);
}
/**
* This method is triggered before a new file is created.
*
* This plugin uses this method to ensure that newly created calendar
* objects contain valid calendar data.
*
* @param string $path
* @param resource $data
* @param DAV\ICollection $parentNode
* @param bool $modified Should be set to true, if this event handler
* changed &$data.
* @return void
*/
function beforeCreateFile($path, &$data, DAV\ICollection $parentNode, &$modified) {
if (!$parentNode instanceof ICalendar)
return;
$this->validateICalendar(
$data,
$path,
$modified,
$this->server->httpRequest,
$this->server->httpResponse,
true
);
}
/**
* Checks if the submitted iCalendar data is in fact, valid.
*
* An exception is thrown if it's not.
*
* @param resource|string $data
* @param string $path
* @param bool $modified Should be set to true, if this event handler
* changed &$data.
* @param RequestInterface $request The http request.
* @param ResponseInterface $response The http response.
* @param bool $isNew Is the item a new one, or an update.
* @return void
*/
protected function validateICalendar(&$data, $path, &$modified, RequestInterface $request, ResponseInterface $response, $isNew) {
// If it's a stream, we convert it to a string first.
if (is_resource($data)) {
$data = stream_get_contents($data);
}
$before = $data;
try {
// If the data starts with a [, we can reasonably assume we're dealing
// with a jCal object.
if (substr($data, 0, 1) === '[') {
$vobj = VObject\Reader::readJson($data);
// Converting $data back to iCalendar, as that's what we
// technically support everywhere.
$data = $vobj->serialize();
$modified = true;
} else {
$vobj = VObject\Reader::read($data);
}
} catch (VObject\ParseException $e) {
throw new DAV\Exception\UnsupportedMediaType('This resource only supports valid iCalendar 2.0 data. Parse error: ' . $e->getMessage());
}
if ($vobj->name !== 'VCALENDAR') {
throw new DAV\Exception\UnsupportedMediaType('This collection can only support iCalendar objects.');
}
$sCCS = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
// Get the Supported Components for the target calendar
list($parentPath) = Uri\split($path);
$calendarProperties = $this->server->getProperties($parentPath, [$sCCS]);
if (isset($calendarProperties[$sCCS])) {
$supportedComponents = $calendarProperties[$sCCS]->getValue();
} else {
$supportedComponents = ['VJOURNAL', 'VTODO', 'VEVENT'];
}
$foundType = null;
foreach ($vobj->getComponents() as $component) {
switch ($component->name) {
case 'VTIMEZONE' :
continue 2;
case 'VEVENT' :
case 'VTODO' :
case 'VJOURNAL' :
$foundType = $component->name;
break;
}
}
if (!$foundType || !in_array($foundType, $supportedComponents)) {
throw new Exception\InvalidComponentType('iCalendar objects must at least have a component of type ' . implode(', ', $supportedComponents));
}
$options = VObject\Node::PROFILE_CALDAV;
$prefer = $this->server->getHTTPPrefer();
if ($prefer['handling'] !== 'strict') {
$options |= VObject\Node::REPAIR;
}
$messages = $vobj->validate($options);
$highestLevel = 0;
$warningMessage = null;
// $messages contains a list of problems with the vcard, along with
// their severity.
foreach ($messages as $message) {
if ($message['level'] > $highestLevel) {
// Recording the highest reported error level.
$highestLevel = $message['level'];
$warningMessage = $message['message'];
}
switch ($message['level']) {
case 1 :
// Level 1 means that there was a problem, but it was repaired.
$modified = true;
break;
case 2 :
// Level 2 means a warning, but not critical
break;
case 3 :
// Level 3 means a critical error
throw new DAV\Exception\UnsupportedMediaType('Validation error in iCalendar: ' . $message['message']);
}
}
if ($warningMessage) {
$response->setHeader(
'X-Sabre-Ew-Gross',
'iCalendar validation warning: ' . $warningMessage
);
}
// We use an extra variable to allow event handles to tell us whether
// the object was modified or not.
//
// This helps us determine if we need to re-serialize the object.
$subModified = false;
$this->server->emit(
'calendarObjectChange',
[
$request,
$response,
$vobj,
$parentPath,
&$subModified,
$isNew
]
);
if ($modified || $subModified) {
// An event handler told us that it modified the object.
$data = $vobj->serialize();
// Using md5 to figure out if there was an *actual* change.
if (!$modified && strcmp($data, $before) !== 0) {
$modified = true;
}
}
// Destroy circular references so PHP will garbage collect the object.
$vobj->destroy();
}
/**
* This method is triggered whenever a subsystem reqeuests the privileges
* that are supported on a particular node.
*
* @param INode $node
* @param array $supportedPrivilegeSet
*/
function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet) {
if ($node instanceof ICalendar) {
$supportedPrivilegeSet['{DAV:}read']['aggregates']['{' . self::NS_CALDAV . '}read-free-busy'] = [
'abstract' => false,
'aggregates' => [],
];
}
}
/**
* This method is used to generate HTML output for the
* DAV\Browser\Plugin. This allows us to generate an interface users
* can use to create new calendars.
*
* @param DAV\INode $node
* @param string $output
* @return bool
*/
function htmlActionsPanel(DAV\INode $node, &$output) {
if (!$node instanceof CalendarHome)
return;
$output .= '<tr><td colspan="2"><form method="post" action="">
<h3>Create new calendar</h3>
<input type="hidden" name="sabreAction" value="mkcol" />
<input type="hidden" name="resourceType" value="{DAV:}collection,{' . self::NS_CALDAV . '}calendar" />
<label>Name (uri):</label> <input type="text" name="name" /><br />
<label>Display name:</label> <input type="text" name="{DAV:}displayname" /><br />
<input type="submit" value="create" />
</form>
</td></tr>';
return false;
}
/**
* This event is triggered after GET requests.
*
* This is used to transform data into jCal, if this was requested.
*
* @param RequestInterface $request
* @param ResponseInterface $response
* @return void
*/
function httpAfterGet(RequestInterface $request, ResponseInterface $response) {
if (strpos($response->getHeader('Content-Type'), 'text/calendar') === false) {
return;
}
$result = HTTP\Util::negotiate(
$request->getHeader('Accept'),
['text/calendar', 'application/calendar+json']
);
if ($result !== 'application/calendar+json') {
// Do nothing
return;
}
// Transforming.
$vobj = VObject\Reader::read($response->getBody());
$jsonBody = json_encode($vobj->jsonSerialize());
$response->setBody($jsonBody);
// Destroy circular references so PHP will garbage collect the object.
$vobj->destroy();
$response->setHeader('Content-Type', 'application/calendar+json');
$response->setHeader('Content-Length', strlen($jsonBody));
}
/**
* Returns a bunch of meta-data about the plugin.
*
* Providing this information is optional, and is mainly displayed by the
* Browser plugin.
*
* The description key in the returned array may contain html and will not
* be sanitized.
*
* @return array
*/
function getPluginInfo() {
return [
'name' => $this->getPluginName(),
'description' => 'Adds support for CalDAV (rfc4791)',
'link' => 'http://sabre.io/dav/caldav/',
];
}
}
