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	diff --git a/plugins/libcalendaring/lib/libcalendaring_vcalendar.php b/plugins/libcalendaring/lib/libcalendaring_vcalendar.php
	index 55420e43..f3cdd063 100644
	--- a/plugins/libcalendaring/lib/libcalendaring_vcalendar.php
	+++ b/plugins/libcalendaring/lib/libcalendaring_vcalendar.php
	@@ -1,1556 +1,1568 @@
	<?php

	/**
	* iCalendar functions for the libcalendaring plugin
	*
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2013-2015, 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;
	use \Sabre\VObject\DateTimeParser;

	/**
	* Class to parse and build vCalendar (iCalendar) files
	*
	* Uses the Sabre VObject library, version 3.x.
	*
	*/
	class libcalendaring_vcalendar implements Iterator
	{
	private $timezone;
	private $attach_uri = null;
	private $prodid = '-//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',
	'delegated-from' => 'DELEGATED-FROM',
	'delegated-to' => 'DELEGATED-TO',
	'schedule-status' => 'SCHEDULE-STATUS',
	'schedule-agent' => 'SCHEDULE-AGENT',
	'sent-by' => 'SENT-BY',
	);
	private $organizer_keymap = array(
	'name' => 'CN',
	'schedule-status' => 'SCHEDULE-STATUS',
	'schedule-agent' => 'SCHEDULE-AGENT',
	'sent-by' => 'SENT-BY',
	);
	private $iteratorkey = 0;
	private $charset;
	private $forward_exceptions;
	private $vhead;
	private $fp;
	private $vtimezones = array();

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


	/**
	* Default constructor
	*/
	function __construct($tz = null)
	{
	$this->timezone = $tz;
	$this->prodid = '-//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;
	}

	/**
	* Setter for a user-agent string to tweak input/output accordingly
	*/
	public function set_agent($agent)
	{
	$this->agent = $agent;
	}

	/**
	* Free resources by clearing member vars
	*/
	public function reset()
	{
	$this->vhead = '';
	$this->method = '';
	$this->objects = array();
	$this->freebusy = array();
	$this->vtimezones = array();
	$this->iteratorkey = 0;

	if ($this->fp) {
	fclose($this->fp);
	$this->fp = null;
	}
	}

	/**
	* Import events from iCalendar format
	*
	* @param string vCalendar input
	* @param string Input charset (from envelope)
	* @param boolean True if parsing exceptions should be forwarded to the caller
	* @return array List of events extracted from the input
	*/
	public function import($vcal, $charset = 'UTF-8', $forward_exceptions = false, $memcheck = true)
	{
	// TODO: convert charset to UTF-8 if other

	try {
	// estimate the memory usage and try to avoid fatal errors when allowed memory gets exhausted
	if ($memcheck) {
	$count = substr_count($vcal, 'BEGIN:VEVENT') + substr_count($vcal, 'BEGIN:VTODO');
	$expected_memory = $count * 70*1024; // assume ~ 70K per event (empirically determined)

	if (!rcube_utils::mem_check($expected_memory)) {
	throw new Exception("iCal file too big");
	}
	}

	$vobject = VObject\Reader::read($vcal, VObject\Reader::OPTION_FORGIVING \| VObject\Reader::OPTION_IGNORE_INVALID_LINES);
	if ($vobject)
	return $this->import_from_vobject($vobject);
	}
	catch (Exception $e) {
	if ($forward_exceptions) {
	throw $e;
	}
	else {
	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
	* @param string Input charset (from envelope)
	* @param boolean True if parsing exceptions should be forwarded to the caller
	* @return array List of events extracted from the file
	*/
	public function import_from_file($filepath, $charset = 'UTF-8', $forward_exceptions = false)
	{
	if ($this->fopen($filepath, $charset, $forward_exceptions)) {
	while ($this->_parse_next(false)) {
	// nop
	}

	fclose($this->fp);
	$this->fp = null;
	}

	return $this->objects;
	}

	/**
	* Open a file to read iCalendar events sequentially
	*
	* @param string File path to read from
	* @param string Input charset (from envelope)
	* @param boolean True if parsing exceptions should be forwarded to the caller
	* @return boolean True if file contents are considered valid
	*/
	public function fopen($filepath, $charset = 'UTF-8', $forward_exceptions = false)
	{
	$this->reset();

	// just to be sure...
	@ini_set('auto_detect_line_endings', true);

	$this->charset = $charset;
	$this->forward_exceptions = $forward_exceptions;
	$this->fp = fopen($filepath, 'r');

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

	fseek($this->fp, 0);
	return $this->_parse_next();
	}

	/**
	* Parse the next event/todo/freebusy object from the input file
	*/
	private function _parse_next($reset = true)
	{
	if ($reset) {
	$this->iteratorkey = 0;
	$this->objects = array();
	$this->freebusy = array();
	}

	$next = $this->_next_component();
	$buffer = $next;

	// load the next component(s) too, as they could contain recurrence exceptions
	while (preg_match('/(RRULE\|RECURRENCE-ID)[:;]/i', $next)) {
	$next = $this->_next_component();
	$buffer .= $next;
	}

	// parse the vevent block surrounded with the vcalendar heading
	if (strlen($buffer) && preg_match('/BEGIN:(VEVENT\|VTODO\|VFREEBUSY)/i', $buffer)) {
	try {
	$this->import($this->vhead . $buffer . "END:VCALENDAR", $this->charset, true, false);
	}
	catch (Exception $e) {
	if ($this->forward_exceptions) {
	throw new VObject\ParseException($e->getMessage() . " in\n" . $buffer);
	}
	else {
	// write the failing section to error log
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => $e->getMessage() . " in\n" . $buffer),
	true, false);
	}

	// advance to next
	return $this->_parse_next($reset);
	}

	return count($this->objects) > 0;
	}

	return false;
	}

	/**
	* Helper method to read the next calendar component from the file
	*/
	private function _next_component()
	{
	$buffer = '';
	$vcalendar_head = false;
	while (($line = fgets($this->fp, 1024)) !== false) {
	// ignore END:VCALENDAR lines
	if (preg_match('/END:VCALENDAR/i', $line)) {
	continue;
	}
	// read vcalendar header (with timezone defintion)
	if (preg_match('/BEGIN:VCALENDAR/i', $line)) {
	$this->vhead = '';
	$vcalendar_head = true;
	}

	// end of VCALENDAR header part
	if ($vcalendar_head && preg_match('/BEGIN:(VEVENT\|VTODO\|VFREEBUSY)/i', $line)) {
	$vcalendar_head = false;
	}

	if ($vcalendar_head) {
	$this->vhead .= $line;
	}
	else {
	$buffer .= $line;
	if (preg_match('/END:(VEVENT\|VTODO\|VFREEBUSY)/i', $line)) {
	break;
	}
	}
	}

	return $buffer;
	}

	/**
	* 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)
	{
	$seen = array();
	$exceptions = array();

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

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

	// temporarily store this as exception
	if (!empty($object['recurrence_date'])) {
	$exceptions[] = $object;
	}
	else if (empty($seen[$object['uid']])) {
	$seen[$object['uid']] = true;
	$this->objects[] = $object;
	}
	}
	else if ($ve->name == 'VFREEBUSY') {
	$this->objects[] = $this->_parse_freebusy($ve);
	}
	}

	// add exceptions to the according master events
	foreach ($exceptions as $exception) {
	$uid = $exception['uid'];

	// make this exception the master
	if (empty($seen[$uid])) {
	$seen[$uid] = true;
	$this->objects[] = $exception;
	}
	else {
	foreach ($this->objects as $i => $object) {
	// add as exception to existing entry with a matching UID
	if ($object['uid'] == $uid) {
	$this->objects[$i]['exceptions'][] = $exception;

	if (!empty($object['recurrence'])) {
	$this->objects[$i]['recurrence']['EXCEPTIONS'] = &$this->objects[$i]['exceptions'];
	}
	break;
	}
	}
	}
	}
	}

	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;
	}

	/**
	* Helper method to determine whether the connected client is an Apple device
	*/
	private function is_apple()
	{
	return stripos($this->agent, 'Apple') !== false
	\|\| stripos($this->agent, 'Mac OS X') !== false
	\|\| stripos($this->agent, 'iOS/') !== false;
	}

	/**
	* 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)
	{
	$event = array(
	'uid' => self::convert_string($ve->UID),
	'title' => self::convert_string($ve->SUMMARY),
	'_type' => $ve->name == 'VTODO' ? 'task' : 'event',
	// set defaults
	'priority' => 0,
	'attendees' => array(),
	'x-custom' => array(),
	);

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

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

	$value = strval($prop);

	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':
	$event['free_busy'] = strval($prop) == 'TRANSPARENT' ? 'free' : 'busy';
	break;

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

	$event['status'] = $value;
	break;

	case 'COMPLETED':
	if (self::convert_datetime($prop)) {
	$event['status'] = 'COMPLETED';
	$event['complete'] = 100;
	}
	break;

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

	case 'RRULE':
	$params = !empty($event['recurrence']) && is_array($event['recurrence']) ? $event['recurrence'] : array();
	// parse recurrence rule attributes
	foreach ($prop->getParts() as $k => $v) {
	$params[strtoupper($k)] = is_array($v) ? implode(',', $v) : $v;
	}
	if (!empty($params['UNTIL'])) {
	$params['UNTIL'] = date_create($params['UNTIL']);
	}
	if (empty($params['INTERVAL'])) {
	$params['INTERVAL'] = 1;
	}

	$event['recurrence'] = array_filter($params);
	break;

	case 'EXDATE':
	if (!empty($value)) {
	$exdates = array_map(function($_) { return is_array($_) ? $_[0] : $_; }, self::convert_datetime($prop, true));
	if (!empty($event['recurrence']['EXDATE'])) {
	$event['recurrence']['EXDATE'] = array_merge($event['recurrence']['EXDATE'], $exdates);
	}
	else {
	$event['recurrence']['EXDATE'] = $exdates;
	}
	}
	break;

	case 'RDATE':
	if (!empty($value)) {
	$rdates = array_map(function($_) { return is_array($_) ? $_[0] : $_; }, self::convert_datetime($prop, true));
	if (!empty($event['recurrence']['RDATE'])) {
	$event['recurrence']['RDATE'] = array_merge($event['recurrence']['RDATE'], $rdates);
	}
	else {
	$event['recurrence']['RDATE'] = $rdates;
	}
	}
	break;

	case 'RECURRENCE-ID':
	$event['recurrence_date'] = self::convert_datetime($prop);
	if ($prop->offsetGet('RANGE') == 'THISANDFUTURE' \|\| $prop->offsetGet('THISANDFUTURE') !== null) {
	$event['thisandfuture'] = true;
	}
	break;

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

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

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

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

	case 'CATEGORY':
	case 'CATEGORIES':
	if (!empty($event['categories'])) {
	$event['categories'] = array_merge((array) $event['categories'], $prop->getParts());
	}
	else {
	$event['categories'] = $prop->getParts();
	}
	break;

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

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

	if ($prop->name == 'ORGANIZER') {
	$attendee['role'] = 'ORGANIZER';
	$attendee['status'] = 'ACCEPTED';
	$event['organizer'] = $attendee;

	if (array_key_exists('schedule-agent', $attendee)) {
	$schedule_agent = $attendee['schedule-agent'];
	}
	}
	else if (empty($event['organizer']) \|\| $attendee['email'] != $event['organizer']['email']) {
	$event['attendees'][] = $attendee;
	}
	break;

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

	default:
	if (substr($prop->name, 0, 2) == 'X-')
	$event['x-custom'][] = array($prop->name, strval($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') {
	$event['allday'] = !empty($event['start']->_dateonly);

	// events may lack the DTEND property, set it to DTSTART (RFC5545 3.6.1)
	if (empty($event['end'])) {
	$event['end'] = clone $event['start'];
	}
	// shift end-date by one day (except Thunderbird)
	else if ($event['allday'] && is_object($event['end'])) {
	$event['end']->sub(new \DateInterval('PT23H'));
	}

	// sanity-check and fix end date
	if (!empty($event['end']) && $event['end'] < $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']) && $event['_type'] == 'event') {
	array_unshift($event['attendees'], $event['organizer']);
	}

	// find alarms
	foreach ($ve->select('VALARM') as $valarm) {
	$action = 'DISPLAY';
	$trigger = null;
	$alarm = array();

	foreach ($valarm->children() as $prop) {
	$value = strval($prop);

	switch ($prop->name) {
	case 'TRIGGER':
	foreach ($prop->parameters as $param) {
	if ($param->name == 'VALUE' && $param->getValue() == 'DATE-TIME') {
	$trigger = '@' . $prop->getDateTime()->format('U');
	$alarm['trigger'] = $prop->getDateTime();
	}
	else if ($param->name == 'RELATED') {
	$alarm['related'] = $param->getValue();
	}
	}
	if (!$trigger && ($values = libcalendaring::parse_alarm_value($value))) {
	$trigger = $values[2];
	}

	if (empty($alarm['trigger'])) {
	$alarm['trigger'] = rtrim(preg_replace('/([A-Z])0[WDHMS]/', '\\1', $value), 'T');
	// if all 0-values have been stripped, assume 'at time'
	if ($alarm['trigger'] == 'P') {
	$alarm['trigger'] = 'PT0S';
	}
	}
	break;

	case 'ACTION':
	$action = $alarm['action'] = strtoupper($value);
	break;

	case 'SUMMARY':
	case 'DESCRIPTION':
	case 'DURATION':
	$alarm[strtolower($prop->name)] = self::convert_string($prop);
	break;

	case 'REPEAT':
	$alarm['repeat'] = intval($value);
	break;

	case 'ATTENDEE':
	$alarm['attendees'][] = preg_replace('!^mailto:!i', '', $value);
	break;

	case 'ATTACH':
	$params = self::parameters_array($prop);
	if (strlen($value) && (preg_match('/^[a-z]+:/', $value) \|\| strtoupper($params['VALUE']) == 'URI')) {
	// we only support URI-type of attachments here
	$alarm['uri'] = $value;
	}
	break;
	}
	}

	if ($action != 'NONE') {
	// store first alarm in legacy property
	if ($trigger && empty($event['alarms'])) {
	$event['alarms'] = $trigger . ':' . $action;
	}

	if (!empty($alarm['trigger'])) {
	$event['valarms'][] = $alarm;
	}
	}
	}

	// assign current timezone to event start/end
	if (!empty($event['start']) && $event['start'] instanceof DateTimeInterface) {
	$this->_apply_timezone($event['start']);
	}
	else {
	unset($event['start']);
	}

	if (!empty($event['end']) && $event['end'] instanceof DateTimeInterface) {
	$this->_apply_timezone($event['end']);
	}
	else {
	unset($event['end']);
	}

	// some iTip CANCEL messages only contain the start date
	if (empty($event['end']) && !empty($event['start']) && $this->method == 'CANCEL') {
	$event['end'] = clone $event['start'];
	}

	// T2531: Remember SCHEDULE-AGENT in custom property to properly
	// support event updates via CalDAV when SCHEDULE-AGENT=CLIENT is used
	if (isset($schedule_agent)) {
	$event['x-custom'][] = array('SCHEDULE-AGENT', $schedule_agent);
	}

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

	return $event;
	}

	/**
	* Apply user timezone to DateTime object
	*/
	private function _apply_timezone(&$date)
	{
	if (empty($this->timezone)) {
	return;
	}

	// For date-only we'll keep the date and time intact
	if (!empty($date->_dateonly)) {
	$dt = new libcalendaring_datetime(null, $this->timezone);
	$dt->setDate($date->format('Y'), $date->format('n'), $date->format('j'));
	$dt->setTime($date->format('G'), $date->format('i'), 0);
	$date = $dt;
	}
	else {
	$date->setTimezone($this->timezone);
	}
	}

	/**
	* 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;

	$value = strval($prop);

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

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

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

	// skip dupes
	if (!empty($seen[$value.':'.$fbtype])) {
	break;
	}

	$seen[$value.':'.$fbtype] = true;

	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);

	$busyStart = DateTimeParser::parse($busyStart);
	$busyEnd = DateTimeParser::parse($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'] = $value;
	}
	}

	return $this->freebusy;
	}

	/**
	*
	*/
	public static function convert_string($prop)
	{
	return strval($prop);
	}

	/**
	*
	*/
	public static function unescape($prop)
	{
	return str_replace('\,', ',', strval($prop));
	}

	/**
	* Helper method to correctly interpret an all-day date value
	*/
	public static function convert_datetime($prop, $as_array = false)
	{
	if (empty($prop)) {
	return $as_array ? [] : null;
	}

	if ($prop instanceof VObject\Property\ICalendar\DateTime) {
	if (count($prop->getDateTimes()) > 1) {
	$dt = [];
	$dateonly = !$prop->hasTime();

	foreach ($prop->getDateTimes() as $item) {
	- $item = libcalendaring_datetime::createFromImmutable($item);
	+ $item = self::toDateTime($item);
	$item->_dateonly = $dateonly;
	$dt[] = $item;
	}
	}
	else {
	- $dt = libcalendaring_datetime::createFromImmutable($prop->getDateTime());
	+ $dt = self::toDateTime($prop->getDateTime());
	if (!$prop->hasTime()) {
	$dt->_dateonly = true;
	}
	}
	}
	else if ($prop instanceof VObject\Property\ICalendar\Period) {
	$dt = [];
	foreach ($prop->getParts() as $val) {
	try {
	list($start, $end) = explode('/', $val);
	$start = DateTimeParser::parseDateTime($start);

	// This is a duration value.
	if ($end[0] === 'P') {
	$dur = DateTimeParser::parseDuration($end);
	$end = clone $start;
	$end->add($dur);
	}
	else {
	$end = DateTimeParser::parseDateTime($end);
	}

	- $dt[] = [libcalendaring_datetime::createFromImmutable($start), libcalendaring_datetime::createFromImmutable($end)];
	+ $dt[] = [self::toDateTime($start), self::toDateTime($end)];
	}
	catch (Exception $e) {
	// ignore single date parse errors
	}
	}
	}
	else if ($prop instanceof \DateTimeInterface) {
	- $dt = libcalendaring_datetime::createFromImmutable($prop);
	+ $dt = self::toDateTime($prop);
	}

	// force return value to array if requested
	if ($as_array && !is_array($dt)) {
	$dt = empty($dt) ? [] : [$dt];
	}

	return $dt;
	}


	/**
	* Create a Sabre\VObject\Property instance from a PHP DateTime object
	*
	* @param object VObject\Document parent node to create property for
	* @param string Property name
	* @param object DateTime
	* @param boolean Set as UTC date
	* @param boolean Set as VALUE=DATE property
	*/
	public function datetime_prop($cal, $name, $dt, $utc = false, $dateonly = null, $set_type = false)
	{
	if ($utc) {
	$dt->setTimeZone(new \DateTimeZone('UTC'));
	$is_utc = true;
	}
	else {
	$is_utc = ($tz = $dt->getTimezone()) && in_array($tz->getName(), array('UTC','GMT','Z'));
	}
	$is_dateonly = $dateonly === null ? !empty($dt->_dateonly) : (bool) $dateonly;
	$vdt = $cal->createProperty($name, $dt, null, $is_dateonly ? 'DATE' : 'DATE-TIME');

	if ($is_dateonly) {
	$vdt['VALUE'] = 'DATE';
	}
	else if ($set_type) {
	$vdt['VALUE'] = 'DATE-TIME';
	}

	// register timezone for VTIMEZONE block
	if (!$is_utc && !$dateonly && $tz && ($tzname = $tz->getName())) {
	$ts = $dt->format('U');
	if (!empty($this->vtimezones[$tzname])) {
	$this->vtimezones[$tzname][0] = min($this->vtimezones[$tzname][0], $ts);
	$this->vtimezones[$tzname][1] = max($this->vtimezones[$tzname][1], $ts);
	}
	else {
	$this->vtimezones[$tzname] = array($ts, $ts);
	}
	}

	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] = is_array($values[$from]) ? join(',', $values[$from]) : $values[$from];
	}
	return $out;
	}

	/**
	*
	*/
	private static function parameters_array($prop)
	{
	$params = array();
	foreach ($prop->parameters() as $name => $value) {
	$params[strtoupper($name)] = strval($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
	* @param boolean Add VTIMEZONE block with timezone definitions for the included events
	* @return string Events in iCalendar format (http://tools.ietf.org/html/rfc5545)
	*/
	public function export($objects, $method = null, $write = false, $get_attachment = false, $with_timezones = true)
	{
	$this->method = $method;

	// encapsulate in VCALENDAR container
	$vcal = new VObject\Component\VCalendar();
	$vcal->VERSION = '2.0';
	$vcal->PRODID = $this->prodid;
	$vcal->CALSCALE = 'GREGORIAN';

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

	// 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);
	}

	// include timezone information
	if ($with_timezones \|\| !empty($method)) {
	foreach ($this->vtimezones as $tzid => $range) {
	$vt = self::get_vtimezone($tzid, $range[0], $range[1], $vcal);
	if (empty($vt)) {
	continue; // no timezone information found
	}

	if ($write) {
	echo $vt->serialize();
	}
	else {
	$vcal->add($vt);
	}
	}
	}

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

	/**
	* Converts internal event representation to Sabre component
	*
	* @param array Event
	* @param callable Callback function to fetch attachment contents, false if no attachment export
	*
	* @return Sabre\VObject\Component\VEvent Sabre component
	*/
	public function toSabreComponent($object, $get_attachment = false)
	{
	$vcal = new VObject\Component\VCalendar();

	$this->_to_ical($object, $vcal, $get_attachment);

	return $vcal->getBaseComponent();
	}

	/**
	* 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)
	{
	$type = !empty($event['_type']) ? $event['_type'] : 'event';

	$cal = $vcal ?: new VObject\Component\VCalendar();
	$ve = $cal->create($this->type_component_map[$type]);
	$ve->UID = $event['uid'];

	// set DTSTAMP according to RFC 5545, 3.8.7.2.
	$dtstamp = !empty($event['changed']) && empty($this->method) ? $event['changed'] : new DateTime('now', new \DateTimeZone('UTC'));
	$ve->DTSTAMP = $this->datetime_prop($cal, 'DTSTAMP', $dtstamp, true);

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

	// we're exporting a recurrence instance only
	if (!$recurrence_id && !empty($event['recurrence_date']) && $event['recurrence_date'] instanceof DateTimeInterface) {
	$recurrence_id = $this->datetime_prop($cal, 'RECURRENCE-ID', $event['recurrence_date'], false, !empty($event['allday']));
	if (!empty($event['thisandfuture'])) {
	$recurrence_id->add('RANGE', 'THISANDFUTURE');
	}
	}

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

	if (!empty($event['title'])) {
	$ve->add('SUMMARY', $event['title']);
	}

	if (!empty($event['location'])) {
	$ve->add($this->is_apple() ? new vobject_location_property($cal, 'LOCATION', $event['location']) : $cal->create('LOCATION', $event['location']));
	}

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

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

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

	if (!empty($event['recurrence']['FREQ'])) {
	$ve->add('RRULE', libcalendaring::to_rrule($event['recurrence'], !empty($event['allday'])));
	}

	// add EXDATEs each one per line (for Thunderbird Lightning)
	if (is_array($exdates)) {
	foreach ($exdates as $exdate) {
	if ($exdate instanceof DateTimeInterface) {
	$ve->add($this->datetime_prop($cal, 'EXDATE', $exdate));
	}
	}
	}
	// add RDATEs
	if (is_array($rdates)) {
	foreach ($rdates as $rdate) {
	$ve->add($this->datetime_prop($cal, 'RDATE', $rdate));
	}
	}
	}

	if (!empty($event['categories'])) {
	$cat = $cal->create('CATEGORIES');
	$cat->setParts((array)$event['categories']);
	$ve->add($cat);
	}

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

	// for Outlook clients we provide the X-MICROSOFT-CDO-BUSYSTATUS property
	if (stripos($this->agent, 'outlook') !== false) {
	$ve->add('X-MICROSOFT-CDO-BUSYSTATUS', $event['free_busy'] == 'outofoffice' ? 'OOF' : strtoupper($event['free_busy']));
	}
	}

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

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

	if (!empty($event['complete'])) {
	$ve->add('PERCENT-COMPLETE', intval($event['complete']));
	}

	// Apple iCal and BusyCal required the COMPLETED date to be set in order to consider a task complete
	if (
	(!empty($event['status']) && $event['status'] == 'COMPLETED')
	\|\| (!empty($event['complete']) && $event['complete'] == 100)
	) {
	$completed = !empty($event['changed']) ? $event['changed'] : new DateTime('now - 1 hour');
	$ve->add($this->datetime_prop($cal, 'COMPLETED', $completed, true));
	}

	if (!empty($event['valarms'])) {
	foreach ($event['valarms'] as $alarm) {
	$va = $cal->createComponent('VALARM');
	$va->action = $alarm['action'];
	if ($alarm['trigger'] instanceof DateTimeInterface) {
	$va->add($this->datetime_prop($cal, 'TRIGGER', $alarm['trigger'], true, null, true));
	}
	else {
	$alarm_props = array();
	if (!empty($alarm['related']) && strtoupper($alarm['related']) == 'END') {
	$alarm_props['RELATED'] = 'END';
	}
	$va->add('TRIGGER', $alarm['trigger'], $alarm_props);
	}

	if (!empty($alarm['action']) && $alarm['action'] == 'EMAIL') {
	if (!empty($alarm['attendees'])) {
	foreach ((array) $alarm['attendees'] as $attendee) {
	$va->add('ATTENDEE', 'mailto:' . $attendee);
	}
	}
	}
	if (!empty($alarm['description'])) {
	$va->add('DESCRIPTION', $alarm['description']);
	}
	if (!empty($alarm['summary'])) {
	$va->add('SUMMARY', $alarm['summary']);
	}
	if (!empty($alarm['duration'])) {
	$va->add('DURATION', $alarm['duration']);
	$va->add('REPEAT', !empty($alarm['repeat']) ? intval($alarm['repeat']) : 0);
	}
	if (!empty($alarm['uri'])) {
	$va->add('ATTACH', $alarm['uri'], array('VALUE' => 'URI'));
	}
	$ve->add($va);
	}
	}
	// legacy support
	else if (!empty($event['alarms'])) {
	$va = $cal->createComponent('VALARM');
	list($trigger, $va->action) = explode(':', $event['alarms']);
	$val = libcalendaring::parse_alarm_value($trigger);
	if (!empty($val[3])) {
	$va->add('TRIGGER', $val[3]);
	}
	else if ($val[0] instanceof DateTimeInterface) {
	$va->add($this->datetime_prop($cal, 'TRIGGER', $val[0], true, null, true));
	}
	$ve->add($va);
	}

	// Find SCHEDULE-AGENT
	if (!empty($event['x-custom'])) {
	foreach ((array) $event['x-custom'] as $prop) {
	if ($prop[0] === 'SCHEDULE-AGENT') {
	$schedule_agent = $prop[1];
	}
	}
	}

	if (!empty($event['attendees'])) {
	foreach ((array) $event['attendees'] as $attendee) {
	if ($attendee['role'] == 'ORGANIZER') {
	if (empty($event['organizer']))
	$event['organizer'] = $attendee;
	}
	else if (!empty($attendee['email'])) {
	if (isset($attendee['rsvp'])) {
	$attendee['rsvp'] = $attendee['rsvp'] ? 'TRUE' : null;
	}

	$mailto = $attendee['email'];
	$attendee = array_filter(self::map_keys($attendee, $this->attendee_keymap));

	if (isset($schedule_agent) && !isset($attendee['SCHEDULE-AGENT'])) {
	$attendee['SCHEDULE-AGENT'] = $schedule_agent;
	}

	$ve->add('ATTENDEE', 'mailto:' . $mailto, $attendee);
	}
	}
	}

	if (!empty($event['organizer'])) {
	$organizer = array_filter(self::map_keys($event['organizer'], $this->organizer_keymap));

	if (isset($schedule_agent) && !isset($organizer['SCHEDULE-AGENT'])) {
	$organizer['SCHEDULE-AGENT'] = $schedule_agent;
	}

	$ve->add('ORGANIZER', 'mailto:' . $event['organizer']['email'], $organizer);
	}

	if (!empty($event['url'])) {
	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'));
	}

	if (!empty($event['comment'])) {
	$ve->add('COMMENT', $event['comment']);
	}

	$memory_limit = parse_bytes(ini_get('memory_limit'));

	// export attachments
	if (!empty($event['attachments'])) {
	foreach ((array)$event['attachments'] as $attach) {
	// check available memory and skip attachment export if we can't buffer it
	// @todo: use rcube_utils::mem_check()
	if (is_callable($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',
	$data,
	array_filter(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'));
	}
	}
	}

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

	// add custom properties
	if (!empty($event['x-custom'])) {
	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 (!empty($event['recurrence']) && !empty($event['recurrence']['EXCEPTIONS'])) {
	foreach ($event['recurrence']['EXCEPTIONS'] as $ex) {
	$exdate = !empty($ex['recurrence_date']) ? $ex['recurrence_date'] : $ex['start'];
	$recurrence_id = $this->datetime_prop($cal, 'RECURRENCE-ID', $exdate, false, !empty($event['allday']));
	if (!empty($ex['thisandfuture'])) {
	$recurrence_id->add('RANGE', 'THISANDFUTURE');
	}

	$ex['uid'] = $ve->UID;

	$this->_to_ical($ex, $vcal, $get_attachment, $recurrence_id);
	}
	}
	}

	/**
	* Returns a VTIMEZONE component for a Olson timezone identifier
	* with daylight transitions covering the given date range.
	*
	* @param string Timezone ID as used in PHP's Date functions
	* @param integer Unix timestamp with first date/time in this timezone
	* @param integer Unix timestap with last date/time in this timezone
	* @param VObject\Component\VCalendar Optional VCalendar component
	*
	* @return mixed A Sabre\VObject\Component object representing a VTIMEZONE definition
	* or false if no timezone information is available
	*/
	public static function get_vtimezone($tzid, $from = 0, $to = 0, $cal = null)
	{
	// TODO: Consider using tzurl.org database for better interoperability e.g. with Outlook

	if (!$from) $from = time();
	if (!$to) $to = $from;
	if (!$cal) $cal = new VObject\Component\VCalendar();

	if (is_string($tzid)) {
	try {
	$tz = new \DateTimeZone($tzid);
	}
	catch (\Exception $e) {
	return false;
	}
	}
	else if (is_a($tzid, '\\DateTimeZone')) {
	$tz = $tzid;
	}

	if (empty($tz) \|\| !is_a($tz, '\\DateTimeZone')) {
	return false;
	}

	$year = 86400 * 360;
	$transitions = $tz->getTransitions($from - $year, $to + $year);

	// Make sure VTIMEZONE contains at least one STANDARD/DAYLIGHT component
	// when there's only one transition in specified time period (T5626)
	if (count($transitions) == 1) {
	// Get more transitions and use OFFSET from the previous to last
	$more_transitions = $tz->getTransitions(0, $to + $year);
	if (count($more_transitions) > 1) {
	$index = count($more_transitions) - 2;
	$tzfrom = $more_transitions[$index]['offset'] / 3600;
	}
	}

	$vt = $cal->createComponent('VTIMEZONE');
	$vt->TZID = $tz->getName();

	$std = null; $dst = null;
	foreach ($transitions as $i => $trans) {
	$cmp = null;

	if (!isset($tzfrom)) {
	$tzfrom = $trans['offset'] / 3600;
	continue;
	}

	if ($trans['isdst']) {
	$t_dst = $trans['ts'];
	$dst = $cal->createComponent('DAYLIGHT');
	$cmp = $dst;
	}
	else {
	$t_std = $trans['ts'];
	$std = $cal->createComponent('STANDARD');
	$cmp = $std;
	}

	if ($cmp) {
	$dt = new DateTime($trans['time']);
	$offset = $trans['offset'] / 3600;

	$cmp->DTSTART = $dt->format('Ymd\THis');
	$cmp->TZOFFSETFROM = sprintf('%+03d%02d', floor($tzfrom), ($tzfrom - floor($tzfrom)) * 60);
	$cmp->TZOFFSETTO = sprintf('%+03d%02d', floor($offset), ($offset - floor($offset)) * 60);

	if (!empty($trans['abbr'])) {
	$cmp->TZNAME = $trans['abbr'];
	}

	$tzfrom = $offset;
	$vt->add($cmp);
	}

	// we covered the entire date range
	if ($std && $dst && min($t_std, $t_dst) < $from && max($t_std, $t_dst) > $to) {
	break;
	}
	}

	// add X-MICROSOFT-CDO-TZID if available
	$microsoftExchangeMap = array_flip(VObject\TimeZoneUtil::$microsoftExchangeMap);
	if (array_key_exists($tz->getName(), $microsoftExchangeMap)) {
	$vt->add('X-MICROSOFT-CDO-TZID', $microsoftExchangeMap[$tz->getName()]);
	}

	return $vt;
	}

	+ /**
	+ * Convert DateTime into libcalendaring_datetime
	+ */
	+ private static function toDateTime($date)
	+ {
	+ return libcalendaring_datetime::createFromFormat(
	+ 'Y-m-d\\TH:i:s',
	+ $date->format('Y-m-d\\TH:i:s'),
	+ $date->getTimezone()
	+ );
	+ }
	+

	/* Implement PHP 5 Iterator interface to make foreach work */

	#[\ReturnTypeWillChange]
	function current()
	{
	return $this->objects[$this->iteratorkey];
	}

	#[\ReturnTypeWillChange]
	function key()
	{
	return $this->iteratorkey;
	}

	#[\ReturnTypeWillChange]
	function next()
	{
	$this->iteratorkey++;

	// read next chunk if we're reading from a file
	if (empty($this->objects[$this->iteratorkey]) && $this->fp) {
	$this->_parse_next(true);
	}

	return $this->valid();
	}

	#[\ReturnTypeWillChange]
	function rewind()
	{
	$this->iteratorkey = 0;
	}

	#[\ReturnTypeWillChange]
	function valid()
	{
	return !empty($this->objects[$this->iteratorkey]);
	}

	}


	/**
	* Override Sabre\VObject\Property\Text that quotes commas in the location property
	* because Apple clients treat that property as list.
	*/
	class vobject_location_property extends VObject\Property\Text
	{
	/**
	* List of properties that are considered 'structured'.
	*
	* @var array
	*/
	protected $structuredValues = [
	// vCard
	'N',
	'ADR',
	'ORG',
	'GENDER',
	'LOCATION',
	// iCalendar
	'REQUEST-STATUS',
	];
	}

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