libvcalendar.php
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libvcalendar.php
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	<?php

	/**
	* iCalendar functions for the libcalendaring plugin
	*
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2013, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	use \Sabre\VObject;

	/**
	* Class to parse and build vCalendar (iCalendar) files
	*
	* Uses the SabreTooth VObject library, version 2.1.
	*
	* Download from https://github.com/fruux/sabre-vobject/archive/2.1.0.zip
	* and place the lib files in this plugin's lib directory
	*
	*/
	class libvcalendar
	{
	private $timezone;
	private $attach_uri = null;
	private $prodid = '-//Roundcube//Roundcube libcalendaring//Sabre//Sabre VObject//EN';
	private $type_component_map = array('event' => 'VEVENT', 'task' => 'VTODO');
	private $attendee_keymap = array('name' => 'CN', 'status' => 'PARTSTAT', 'role' => 'ROLE', 'cutype' => 'CUTYPE', 'rsvp' => 'RSVP');

	public $method;
	public $objects = array();
	public $freebusy = array();

	/**
	* Default constructor
	*/
	function __construct($tz = null)
	{
	// load Sabre\VObject classes
	if (!class_exists('\Sabre\VObject\Reader')) {
	require_once(__DIR__ . '/lib/Sabre/VObject/includes.php');
	}

	$this->timezone = $tz;
	$this->prodid = '-//Roundcube//Roundcube libcalendaring ' . RCUBE_VERSION . '//Sabre//Sabre VObject ' . VObject\Version::VERSION . '//EN';
	}

	/**
	* Setter for timezone information
	*/
	public function set_timezone($tz)
	{
	$this->timezone = $tz;
	}

	/**
	* Setter for URI template for attachment links
	*/
	public function set_attach_uri($uri)
	{
	$this->attach_uri = $uri;
	}

	/**
	* Setter for a custom PRODID attribute
	*/
	public function set_prodid($prodid)
	{
	$this->prodid = $prodid;
	}

	/**
	* Free resources by clearing member vars
	*/
	public function reset()
	{
	$this->method = '';
	$this->objects = array();
	}

	/**
	* Import events from iCalendar format
	*
	* @param string vCalendar input
	* @param string Input charset (from envelope)
	* @return array List of events extracted from the input
	*/
	public function import($vcal, $charset = 'UTF-8')
	{
	// TODO: convert charset to UTF-8 if other

	try {
	$vobject = VObject\Reader::read($vcal, VObject\Reader::OPTION_FORGIVING \| VObject\Reader::OPTION_IGNORE_INVALID_LINES);
	if ($vobject)
	return $this->import_from_vobject($vobject);
	}
	catch (Exception $e) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "iCal data parse error: " . $e->getMessage()),
	true, false);
	}

	return array();
	}

	/**
	* Read iCalendar events from a file
	*
	* @param string File path to read from
	* @return array List of events extracted from the file
	*/
	public function import_from_file($filepath)
	{
	$this->objects = array();
	$fp = fopen($filepath, 'r');

	// check file content first
	$begin = fread($fp, 1024);
	if (!preg_match('/BEGIN:VCALENDAR/i', $begin)) {
	return $this->objects;
	}
	fclose($fp);

	return $this->import(file_get_contents($filepath));
	}

	/**
	* Import objects from an already parsed Sabre\VObject\Component object
	*
	* @param object Sabre\VObject\Component to read from
	* @return array List of events extracted from the file
	*/
	public function import_from_vobject($vobject)
	{
	$this->objects = $this->freebusy = $seen = array();

	if ($vobject->name == 'VCALENDAR') {
	$this->method = strval($vobject->METHOD);

	foreach ($vobject->getBaseComponents() as $ve) {
	if ($ve->name == 'VEVENT' \|\| $ve->name == 'VTODO') {
	// convert to hash array representation
	$object = $this->_to_array($ve);

	if (!$seen[$object['uid']]++) {
	// parse recurrence exceptions
	if ($object['recurrence']) {
	foreach ($vobject->children as $i => $component) {
	if ($component->name == 'VEVENT' && isset($component->{'RECURRENCE-ID'})) {
	$object['recurrence']['EXCEPTIONS'][] = $this->_to_array($component);
	}
	}
	}

	$this->objects[] = $object;
	}
	}
	else if ($ve->name == 'VFREEBUSY') {
	$this->objects[] = $this->_parse_freebusy($ve);
	}
	}
	}

	return $this->objects;
	}

	/**
	* Getter for free-busy periods
	*/
	public function get_busy_periods()
	{
	$out = array();
	foreach ((array)$this->freebusy['periods'] as $period) {
	if ($period[2] != 'FREE') {
	$out[] = $period;
	}
	}

	return $out;
	}

	/**
	* Convert the given VEvent object to a libkolab compatible array representation
	*
	* @param object Vevent object to convert
	* @return array Hash array with object properties
	*/
	private function _to_array($ve)
	{
	$event = array(
	'uid' => strval($ve->UID),
	'title' => strval($ve->SUMMARY),
	'_type' => $ve->name == 'VTODO' ? 'task' : 'event',
	// set defaults
	'priority' => 0,
	'attendees' => array(),
	);

	// Catch possible exceptions when date is invalid (Bug #2144)
	// We can skip these fields, they aren't critical
	if ($ve->CREATED) {
	try {
	$event['created'] = $ve->CREATED->getDateTime();
	} catch (Exception $e) {};
	}
	if ($ve->{'LAST-MODIFIED'}) {
	try {
	$event['changed'] = $ve->{'LAST-MODIFIED'}->getDateTime();
	} catch (Exception $e) {};
	}
	if (!$event['changed'] && $ve->DTSTAMP) {
	try {
	$event['changed'] = $ve->DTSTAMP->getDateTime();
	} catch (Exception $e) {};
	}

	// map other attributes to internal fields
	$_attendees = array();
	foreach ($ve->children as $prop) {
	if (!($prop instanceof VObject\Property))
	continue;

	switch ($prop->name) {
	case 'DTSTART':
	case 'DTEND':
	case 'DUE':
	$propmap = array('DTSTART' => 'start', 'DTEND' => 'end', 'DUE' => 'due');
	$event[$propmap[$prop->name]] = self::convert_datetime($prop);
	break;

	case 'TRANSP':
	$event['free_busy'] = $prop->value == 'TRANSPARENT' ? 'free' : 'busy';
	break;

	case 'STATUS':
	if ($prop->value == 'TENTATIVE')
	$event['free_busy'] = 'tentative';
	else if ($prop->value == 'CANCELLED')
	$event['cancelled'] = true;
	else if ($prop->value == 'COMPLETED')
	$event['complete'] = 100;
	break;

	case 'PRIORITY':
	if (is_numeric($prop->value))
	$event['priority'] = $prop->value;
	break;

	case 'RRULE':
	$params = array();
	// parse recurrence rule attributes
	foreach (explode(';', $prop->value) as $par) {
	list($k, $v) = explode('=', $par);
	$params[$k] = $v;
	}
	if ($params['UNTIL'])
	$params['UNTIL'] = date_create($params['UNTIL']);
	if (!$params['INTERVAL'])
	$params['INTERVAL'] = 1;

	$event['recurrence'] = $params;
	break;

	case 'EXDATE':
	$event['recurrence']['EXDATE'] = array_merge((array)$event['recurrence']['EXDATE'], (array)self::convert_datetime($prop));
	break;

	case 'RECURRENCE-ID':
	// $event['recurrence_id'] = self::convert_datetime($prop);
	break;

	case 'RELATED-TO':
	if ($prop->offsetGet('RELTYPE') == 'PARENT') {
	$event['parent_id'] = $prop->value;
	}
	break;

	case 'SEQUENCE':
	$event['sequence'] = intval($prop->value);
	break;

	case 'PERCENT-COMPLETE':
	$event['complete'] = intval($prop->value);
	break;

	case 'DESCRIPTION':
	case 'LOCATION':
	case 'URL':
	$event[strtolower($prop->name)] = $prop->value;
	break;

	case 'CATEGORY':
	case 'CATEGORIES':
	$event['categories'] = $prop->getParts();
	break;

	case 'CLASS':
	case 'X-CALENDARSERVER-ACCESS':
	$event['sensitivity'] = strtolower($prop->value);
	break;

	case 'X-MICROSOFT-CDO-BUSYSTATUS':
	if ($prop->value == 'OOF')
	$event['free_busy'] == 'outofoffice';
	else if (in_array($prop->value, array('FREE', 'BUSY', 'TENTATIVE')))
	$event['free_busy'] = strtolower($prop->value);
	break;

	case 'ATTENDEE':
	case 'ORGANIZER':
	$params = array();
	foreach ($prop->parameters as $param) {
	switch ($param->name) {
	case 'RSVP': $params[$param->name] = strtolower($param->value) == 'true'; break;
	default: $params[$param->name] = $param->value; break;
	}
	}
	$attendee = self::map_keys($params, array_flip($this->attendee_keymap));
	$attendee['email'] = preg_replace('/^mailto:/i', '', $prop->value);

	if ($prop->name == 'ORGANIZER') {
	$attendee['role'] = 'ORGANIZER';
	$attendee['status'] = 'ACCEPTED';
	$event['organizer'] = $attendee;
	}
	else if ($attendee['email'] != $event['organizer']['email']) {
	$event['attendees'][] = $attendee;
	}
	break;

	case 'ATTACH':
	$params = self::parameters_array($prop);
	if (substr($prop->value, 0, 4) == 'http' && !strpos($prop->value, ':attachment:')) {
	$event['links'][] = $prop->value;
	}
	else if (strlen($prop->value) && strtoupper($params['VALUE']) == 'BINARY') {
	$attachment = self::map_keys($params, array('FMTTYPE' => 'mimetype', 'X-LABEL' => 'name'));
	$attachment['data'] = base64_decode($prop->value);
	$attachment['size'] = strlen($attachment['data']);
	$event['attachments'][] = $attachment;
	}
	break;

	default:
	if (substr($prop->name, 0, 2) == 'X-')
	$event['x-custom'][] = array($prop->name, strval($prop->value));
	break;
	}
	}

	// check DURATION property if no end date is set
	if (empty($event['end']) && $ve->DURATION) {
	try {
	$duration = new DateInterval(strval($ve->DURATION));
	$end = clone $event['start'];
	$end->add($duration);
	$event['end'] = $end;
	}
	catch (\Exception $e) {
	trigger_error(strval($e), E_USER_WARNING);
	}
	}

	// validate event dates
	if ($event['_type'] == 'event') {
	// check for all-day dates
	if ($event['start']->_dateonly) {
	$event['allday'] = true;
	}

	// shift end-date by one day (except Thunderbird)
	if ($event['allday'] && is_object($event['end'])) {
	$event['end']->sub(new \DateInterval('PT23H'));
	}

	// sanity-check and fix end date
	if (empty($event['end'])) {
	$event['end'] = clone $event['start'];
	}
	else if ($event['end'] < $event['start']) {
	$event['end'] = clone $event['start'];
	}
	}

	// make organizer part of the attendees list for compatibility reasons
	if (!empty($event['organizer']) && is_array($event['attendees'])) {
	array_unshift($event['attendees'], $event['organizer']);
	}

	// find alarms
	if ($valarms = $ve->select('VALARM')) {
	$action = 'DISPLAY';
	$trigger = null;

	$valarm = reset($valarms);
	foreach ($valarm->children as $prop) {
	switch ($prop->name) {
	case 'TRIGGER':
	foreach ($prop->parameters as $param) {
	if ($param->name == 'VALUE' && $param->value == 'DATE-TIME') {
	$trigger = '@' . $prop->getDateTime()->format('U');
	}
	}
	if (!$trigger) {
	$trigger = preg_replace('/PT/', '', $prop->value);
	}
	break;

	case 'ACTION':
	$action = $prop->value;
	break;
	}
	}

	if ($trigger)
	$event['alarms'] = $trigger . ':' . $action;
	}

	// assign current timezone to event start/end
	if ($event['start'] instanceof DateTime) {
	if ($this->timezone)
	$event['start']->setTimezone($this->timezone);
	}
	else {
	unset($event['start']);
	}

	if ($event['end'] instanceof DateTime) {
	if ($this->timezone)
	$event['end']->setTimezone($this->timezone);
	}
	else {
	unset($event['end']);
	}

	// minimal validation
	if (empty($event['uid']) \|\| empty($event['start']) != empty($event['end'])) {
	throw new VObject\ParseException('Object validation failed: missing mandatory object properties');
	}

	return $event;
	}

	/**
	* Parse the given vfreebusy component into an array representation
	*/
	private function _parse_freebusy($ve)
	{
	$this->freebusy = array('_type' => 'freebusy', 'periods' => array());
	$seen = array();

	foreach ($ve->children as $prop) {
	if (!($prop instanceof VObject\Property))
	continue;

	switch ($prop->name) {
	case 'DTSTART':
	case 'DTEND':
	$propmap = array('DTSTART' => 'start', 'DTEND' => 'end');
	$this->freebusy[$propmap[$prop->name]] = self::convert_datetime($prop);
	break;

	case 'ORGANIZER':
	$this->freebusy['organizer'] = preg_replace('/^mailto:/i', '', $prop->value);
	break;

	case 'FREEBUSY':
	// The freebusy component can hold more than 1 value, separated by commas.
	$periods = explode(',', $prop->value);
	$fbtype = strval($prop['FBTYPE']) ?: 'BUSY';

	// skip dupes
	if ($seen[$prop->value.':'.$fbtype]++)
	continue;

	foreach ($periods as $period) {
	// Every period is formatted as [start]/[end]. The start is an
	// absolute UTC time, the end may be an absolute UTC time, or
	// duration (relative) value.
	list($busyStart, $busyEnd) = explode('/', $period);

	$busyStart = VObject\DateTimeParser::parse($busyStart);
	$busyEnd = VObject\DateTimeParser::parse($busyEnd);
	if ($busyEnd instanceof \DateInterval) {
	$tmp = clone $busyStart;
	$tmp->add($busyEnd);
	$busyEnd = $tmp;
	}

	if ($busyEnd && $busyEnd > $busyStart)
	$this->freebusy['periods'][] = array($busyStart, $busyEnd, $fbtype);
	}
	break;

	case 'COMMENT':
	$this->freebusy['comment'] = $prop->value;
	}
	}

	return $this->freebusy;
	}

	/**
	* Helper method to correctly interpret an all-day date value
	*/
	public static function convert_datetime($prop)
	{
	if (empty($prop)) {
	return null;
	}
	else if ($prop instanceof VObject\Property\MultiDateTime) {
	$dt = array();
	$dateonly = ($prop->getDateType() & VObject\Property\DateTime::DATE);
	foreach ($prop->getDateTimes() as $item) {
	$item->_dateonly = $dateonly;
	$dt[] = $item;
	}
	}
	else if ($prop instanceof VObject\Property\DateTime) {
	$dt = $prop->getDateTime();
	if ($prop->getDateType() & VObject\Property\DateTime::DATE) {
	$dt->_dateonly = true;
	}
	}
	else if ($prop instanceof DateTime) {
	$dt = $prop;
	}

	return $dt;
	}


	/**
	* Create a Sabre\VObject\Property instance from a PHP DateTime object
	*
	* @param string Property name
	* @param object DateTime
	*/
	public static function datetime_prop($name, $dt, $utc = false)
	{
	$vdt = new VObject\Property\DateTime($name);
	$vdt->setDateTime($dt, $dt->_dateonly ? VObject\Property\DateTime::DATE :
	($utc ? VObject\Property\DateTime::UTC : VObject\Property\DateTime::LOCALTZ));
	return $vdt;
	}

	/**
	* Copy values from one hash array to another using a key-map
	*/
	public static function map_keys($values, $map)
	{
	$out = array();
	foreach ($map as $from => $to) {
	if (isset($values[$from]))
	$out[$to] = $values[$from];
	}
	return $out;
	}

	/**
	*
	*/
	private static function parameters_array($prop)
	{
	$params = array();
	foreach ($prop->parameters as $param) {
	$params[strtoupper($param->name)] = $param->value;
	}
	return $params;
	}


	/**
	* Export events to iCalendar format
	*
	* @param array Events as array
	* @param string VCalendar method to advertise
	* @param boolean Directly send data to stdout instead of returning
	* @param callable Callback function to fetch attachment contents, false if no attachment export
	* @return string Events in iCalendar format (http://tools.ietf.org/html/rfc5545)
	*/
	public function export($objects, $method = null, $write = false, $get_attachment = false, $recurrence_id = null)
	{
	$memory_limit = parse_bytes(ini_get('memory_limit'));

	// encapsulate in VCALENDAR container
	$vcal = VObject\Component::create('VCALENDAR');
	$vcal->version = '2.0';
	$vcal->prodid = $this->prodid;
	$vcal->calscale = 'GREGORIAN';

	if (!empty($method)) {
	$vcal->METHOD = $method;
	}

	// TODO: include timezone information

	// write vcalendar header
	if ($write) {
	echo preg_replace('/END:VCALENDAR[\r\n]*$/m', '', $vcal->serialize());
	}

	foreach ($objects as $object) {
	$this->_to_ical($object, !$write?$vcal:false, $get_attachment);
	}

	if ($write) {
	echo "END:VCALENDAR\r\n";
	return true;
	}
	else {
	return $vcal->serialize();
	}
	}

	/**
	* Build a valid iCal format block from the given event
	*
	* @param array Hash array with event/task properties from libkolab
	* @param object VCalendar object to append event to or false for directly sending data to stdout
	* @param callable Callback function to fetch attachment contents, false if no attachment export
	* @param object RECURRENCE-ID property when serializing a recurrence exception
	*/
	private function _to_ical($event, $vcal, $get_attachment, $recurrence_id = null)
	{
	$type = $event['_type'] ?: 'event';
	$ve = VObject\Component::create($this->type_component_map[$type]);
	$ve->add('UID', $event['uid']);

	// all-day events end the next day
	if ($event['allday'] && !empty($event['end'])) {
	$event['end'] = clone $event['end'];
	$event['end']->add(new \DateInterval('P1D'));
	$event['end']->_dateonly = true;
	}
	if (!empty($event['created']))
	$ve->add(self::datetime_prop('CREATED', $event['created'], true));
	if (!empty($event['changed']))
	$ve->add(self::datetime_prop('DTSTAMP', $event['changed'], true));
	if (!empty($event['start']))
	$ve->add(self::datetime_prop('DTSTART', $event['start'], false));
	if (!empty($event['end']))
	$ve->add(self::datetime_prop('DTEND', $event['end'], false));
	if (!empty($event['due']))
	$ve->add(self::datetime_prop('DUE', $event['due'], false));

	if ($recurrence_id)
	$ve->add($recurrence_id);

	$ve->add('SUMMARY', $event['title']);

	if ($event['location'])
	$ve->add('LOCATION', $event['location']);
	if ($event['description'])
	$ve->add('DESCRIPTION', strtr($event['description'], array("\r\n" => "\n", "\r" => "\n"))); // normalize line endings

	if ($event['sequence'])
	$ve->add('SEQUENCE', $event['sequence']);

	if ($event['recurrence'] && !$recurrence_id) {
	if ($exdates = $event['recurrence']['EXDATE']) {
	unset($event['recurrence']['EXDATE']); // don't serialize EXDATEs into RRULE value
	}

	$ve->add('RRULE', libcalendaring::to_rrule($event['recurrence']));

	// add EXDATEs each one per line (for Thunderbird Lightning)
	if ($exdates) {
	foreach ($exdates as $ex) {
	if ($ex instanceof \DateTime) {
	$exd = clone $event['start'];
	$exd->setDate($ex->format('Y'), $ex->format('n'), $ex->format('j'));
	$exd->setTimeZone(new \DateTimeZone('UTC'));
	$ve->add(new VObject\Property('EXDATE', $exd->format('Ymd\\THis\\Z')));
	}
	}
	}
	}

	if ($event['categories']) {
	$cat = VObject\Property::create('CATEGORIES');
	$cat->setParts((array)$event['categories']);
	$ve->add($cat);
	}

	if (!empty($event['free_busy']))
	$ve->add('TRANSP', $event['free_busy'] == 'free' ? 'TRANSPARENT' : 'OPAQUE');

	if ($event['priority'])
	$ve->add('PRIORITY', $event['priority']);

	if ($event['cancelled'])
	$ve->add('STATUS', 'CANCELLED');
	else if ($event['free_busy'] == 'tentative')
	$ve->add('STATUS', 'TENTATIVE');
	else if ($event['complete'] == 100)
	$ve->add('STATUS', 'COMPLETED');

	if (!empty($event['sensitivity']))
	$ve->add('CLASS', strtoupper($event['sensitivity']));

	if (!empty($event['complete'])) {
	$ve->add('PERCENT-COMPLETE', intval($event['complete']));
	// Apple iCal required the COMPLETED date to be set in order to consider a task complete
	if ($event['complete'] == 100)
	$ve->add(self::datetime_prop('COMPLETED', $event['changed'] ?: new DateTime('now - 1 hour'), true));
	}

	if ($event['alarms']) {
	$va = VObject\Component::create('VALARM');
	list($trigger, $va->action) = explode(':', $event['alarms']);
	$val = libcalendaring::parse_alaram_value($trigger);
	if ($val[1]) $va->add('TRIGGER', preg_replace('/^([-+])(.+)/', '\\1PT\\2', $trigger));
	else $va->add('TRIGGER', gmdate('Ymd\THis\Z', $val[0]), array('VALUE' => 'DATE-TIME'));
	$ve->add($va);
	}

	foreach ((array)$event['attendees'] as $attendee) {
	if ($attendee['role'] == 'ORGANIZER') {
	if (empty($event['organizer']))
	$event['organizer'] = $attendee;
	}
	else if (!empty($attendee['email'])) {
	$attendee['rsvp'] = $attendee['rsvp'] ? 'TRUE' : null;
	$ve->add('ATTENDEE', 'mailto:' . $attendee['email'], self::map_keys($attendee, $this->attendee_keymap));
	}
	}

	if ($event['organizer']) {
	$ve->add('ORGANIZER', 'mailto:' . $event['organizer']['email'], self::map_keys($event['organizer'], array('name' => 'CN')));
	}

	foreach ((array)$event['url'] as $url) {
	if (!empty($url)) {
	$ve->add('URL', $url);
	}
	}

	if (!empty($event['parent_id'])) {
	$ve->add('RELATED-TO', $event['parent_id'], array('RELTYPE' => 'PARENT'));
	}

	// export attachments
	if (!empty($event['attachments'])) {
	foreach ((array)$event['attachments'] as $attach) {
	// check available memory and skip attachment export if we can't buffer it
	if (is_callable($get_attachment) && $memory_limit > 0 && ($memory_used = function_exists('memory_get_usage') ? memory_get_usage() : 1610241024)
	&& $attach['size'] && $memory_used + $attach['size'] * 3 > $memory_limit) {
	continue;
	}
	// embed attachments using the given callback function
	if (is_callable($get_attachment) && ($data = call_user_func($get_attachment, $attach['id'], $event))) {
	// embed attachments for iCal
	$ve->add('ATTACH',
	base64_encode($data),
	array('VALUE' => 'BINARY', 'ENCODING' => 'BASE64', 'FMTTYPE' => $attach['mimetype'], 'X-LABEL' => $attach['name']));
	unset($data); // attempt to free memory
	}
	// list attachments as absolute URIs
	else if (!empty($this->attach_uri)) {
	$ve->add('ATTACH',
	strtr($this->attach_uri, array(
	'{{id}}' => urlencode($attach['id']),
	'{{name}}' => urlencode($attach['name']),
	'{{mimetype}}' => urlencode($attach['mimetype']),
	)),
	array('FMTTYPE' => $attach['mimetype'], 'VALUE' => 'URI'));
	}
	}
	}

	foreach ((array)$event['links'] as $uri) {
	$ve->add('ATTACH', $uri);
	}

	// add custom properties
	foreach ((array)$event['x-custom'] as $prop) {
	$ve->add($prop[0], $prop[1]);
	}

	// append to vcalendar container
	if ($vcal) {
	$vcal->add($ve);
	}
	else { // serialize and send to stdout
	echo $ve->serialize();
	}

	// append recurrence exceptions
	if ($event['recurrence']['EXCEPTIONS']) {
	foreach ($event['recurrence']['EXCEPTIONS'] as $ex) {
	$exdate = clone $event['start'];
	$exdate->setDate($ex['start']->format('Y'), $ex['start']->format('n'), $ex['start']->format('j'));
	$recurrence_id = self::datetime_prop('RECURRENCE-ID', $exdate, true);
	// if ($ex['thisandfuture']) // not supported by any client :-(
	// $recurrence_id->add('RANGE', 'THISANDFUTURE');
	$this->_to_ical($ex, $vcal, $get_attachment, $recurrence_id);
	}
	}
	}

	}

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