egroupware_official/calendar/inc/class.boical.inc.php

<?php
	/**************************************************************************\
	* eGroupWare - iCalendar Parser                                            *
	* http://www.egroupware.org                                                *
	* Written by Lars Kneschke <lkneschke@egroupware.org>                      *
	* --------------------------------------------                             *
	*  This program is free software; you can redistribute it and/or modify it *
	*  under the terms of the GNU General Public License as published by the   *
	*  Free Software Foundation; either version 2 of the License.              *
	\**************************************************************************/

	/* $Id$ */

	require_once EGW_SERVER_ROOT.'/calendar/inc/class.bocalupdate.inc.php';
	require_once EGW_SERVER_ROOT.'/phpgwapi/inc/horde/Horde/iCalendar.php';

	/**
	 * iCal import and export via Horde iCalendar classes
	 *
	 * @package calendar
	 * @author Lars Kneschke <lkneschke@egroupware.org>
	 * @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
	 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
	 */
	class boical extends bocalupdate
	{
		/**
		 * @var array $supportedFields array containing the supported fields of the importing device
		 */
		var $supportedFields;
		
		var $recur_days_1_0 = array(
			MCAL_M_MONDAY    => 'MO',
			MCAL_M_TUESDAY   => 'TU',
			MCAL_M_WEDNESDAY => 'WE',
			MCAL_M_THURSDAY  => 'TH',
			MCAL_M_FRIDAY    => 'FR',
			MCAL_M_SATURDAY  => 'SA',
			MCAL_M_SUNDAY    => 'SU',
		);

		/**
		 * @var array $status_egw2ical conversation of the participant status egw => ical
		 */
		var $status_egw2ical = array(
			'U' => 'NEEDS-ACTION',
			'A' => 'ACCEPTED',
			'R' => 'DECLINED',
			'T' => 'TENTATIVE',
		);
		/**
		 * @var array conversation of the participant status ical => egw
		 */
		var $status_ical2egw = array(
			'NEEDS-ACTION' => 'U',
			'ACCEPTED'     => 'A',
			'DECLINED'     => 'R',
			'TENTATIVE'    => 'T',
		);
		
		/**
		 * @var array $status_ical2egw conversation of the priority egw => ical
		 */
		var $priority_egw2ical = array(
			0 => 0,		// undefined
			1 => 9,		// low
			2 => 5,		// normal
			3 => 1,		// high
		);
		/**
		 * @var array $status_ical2egw conversation of the priority ical => egw
		 */
		var $priority_ical2egw = array(
			0 => 0,		// undefined
			9 => 1,	8 => 1, 7 => 1, 6 => 1,	// low
			5 => 2,		// normal
			4 => 3, 2 => 3, 3 => 3, 1 => 3,	// high
		);
		
		/**
		 * @var array $recur_egw2ical_2_0 converstaion of egw recur-type => ical FREQ
		 */
		var $recur_egw2ical_2_0 = array(
			MCAL_RECUR_DAILY        => 'DAILY',
			MCAL_RECUR_WEEKLY       => 'WEEKLY',
			MCAL_RECUR_MONTHLY_MDAY => 'MONTHLY',	// BYMONHTDAY={1..31}
			MCAL_RECUR_MONTHLY_WDAY => 'MONTHLY',	// BYDAY={1..5}{MO..SO}
			MCAL_RECUR_YEARLY       => 'YEARLY',
		);

		/**
		 * @var array $recur_egw2ical_1_0 converstaion of egw recur-type => ical FREQ
		 */
		var $recur_egw2ical_1_0 = array(
			MCAL_RECUR_DAILY        => 'D',
			MCAL_RECUR_WEEKLY       => 'W',
			MCAL_RECUR_MONTHLY_MDAY => 'MD',	// BYMONHTDAY={1..31}
			MCAL_RECUR_MONTHLY_WDAY => 'MP',	// BYDAY={1..5}{MO..SO}
			MCAL_RECUR_YEARLY       => 'YM',
		);
		
		/**
		 * manufacturer and name of the sync-client
		 *
		 * @var string
		 */
		var $productManufacturer = 'file';
		var $productName = '';

		/**
		 * Exports one calendar event to an iCalendar item
		 *
		 * @param int/array $events (array of) cal_id or array of the events
		 * @param string $method='PUBLISH'
		 * @return string/boolean string with vCal or false on error (eg. no permission to read the event)
		 */
		function &exportVCal($events,$version='1.0', $method='PUBLISH')
		{
			$egwSupportedFields = array(
				'CLASS'			=> array('dbName' => 'public'),
				'SUMMARY'		=> array('dbName' => 'title'),
				'DESCRIPTION'	=> array('dbName' => 'description'),
				'LOCATION'		=> array('dbName' => 'location'),
				'DTSTART'		=> array('dbName' => 'start'),
				'DTEND'			=> array('dbName' => 'end'),
				'ORGANIZER'		=> array('dbName' => 'owner'),
				'ATTENDEE'		=> array('dbName' => 'participants'),
				'RRULE'			=> array('dbName' => 'recur_type'),
				'EXDATE'		=> array('dbName' => 'recur_exception'),
 				'PRIORITY'		=> array('dbName' => 'priority'),
 				'TRANSP'		=> array('dbName' => 'non_blocking'),
				'CATEGORIES'	=> array('dbName' => 'category'),
			);
			if(!is_array($this->supportedFields))
			{
				$this->setSupportedFields();
			}
			
			if($this->productManufacturer == '' )
			{	// syncevolution is broken
				$version = "2.0";
			}
			
			$palm_enddate_workaround=False;
			if($this->productManufacturer == 'Synthesis AG'
				&& strpos($this->productName, "PalmOS") )
			{
				// This workaround adds 1 day to the recur_enddate if it exists, to fix a palm bug
				$palm_enddate_workaround=True;
			}
			
			$vcal = &new Horde_iCalendar;
			$vcal->setAttribute('PRODID','-//eGroupWare//NONSGML eGroupWare Calendar '.$GLOBALS['egw_info']['apps']['calendar']['version'].'//'.
				strtoupper($GLOBALS['egw_info']['user']['preferences']['common']['lang']));
			$vcal->setAttribute('VERSION',$version);
			$vcal->setAttribute('METHOD',$method);

			if (!is_array($events)) $events = array($events);
			
			foreach($events as $event)
			{
				if (!is_array($event) && !($event = $this->read($event,null,false,'server')))	// server = timestamp in server-time(!)
				{
					return false;	// no permission to read $cal_id
				}
				//_debug_array($event);

				// correct daylight saving time
				/* causes times wrong by one hour, if exporting events with DST different from the current date,
				which this fix is suppost to fix. Maybe the problem has been fixed in the horde code too.
				$currentDST = date('I', mktime());
				$eventDST = date('I', $event['start']);
				$DSTCorrection = ($currentDST - $eventDST) * 3600;
				$event['start']	= $event['start'] + $DSTCorrection;
				$event['end']	= $event['end'] + $DSTCorrection;
				*/
				$eventGUID = $GLOBALS['egw']->common->generate_uid('calendar',$event['id']);
				
				$vevent = Horde_iCalendar::newComponent('VEVENT',$vcal);
				$parameters = $attributes = array();
				
				foreach($egwSupportedFields as $icalFieldName => $egwFieldInfo)
				{
					if($this->supportedFields[$egwFieldInfo['dbName']])
					{
						switch($icalFieldName)
						{
							case 'ATTENDEE':
								foreach((array)$event['participants'] as $uid => $status)
								{
									// ToDo, this needs to deal with resources too!!!
									if (!is_numeric($uid)) continue;
	
									$mailto = $GLOBALS['egw']->accounts->id2name($uid,'account_email');
									$cn = trim($GLOBALS['egw']->accounts->id2name($uid,'account_firstname'). ' ' .
										$GLOBALS['egw']->accounts->id2name($uid,'account_lastname'));
									$attributes['ATTENDEE'][]	= $mailto ? 'MAILTO:'. $cn .'<'. $mailto .'>' : '';
									// ROLE={CHAIR|REQ-PARTICIPANT|OPT-PARTICIPANT|NON-PARTICIPANT} NOT used by eGW atm.
									$role = $uid == $event['owner'] ? 'CHAIR' : 'REQ-PARTICIPANT';
									// RSVP={TRUE|FALSE}	// resonse expected, not set in eGW => status=U
									$rsvp = $status == 'U' ? 'TRUE' : 'FALSE';
									// PARTSTAT={NEEDS-ACTION|ACCEPTED|DECLINED|TENTATIVE|DELEGATED|COMPLETED|IN-PROGRESS} everything from delegated is NOT used by eGW atm.
									$status = $this->status_egw2ical[$status];
									// CUTYPE={INDIVIDUAL|GROUP|RESOURCE|ROOM|UNKNOWN}
									switch (is_numeric($uid) ? $GLOBALS['egw']->accounts->get_type($uid) : $uid{0})
									{
										case 'g':
											$cutype = 'GROUP';
											break;
										case 'r':
											$cutype = 'RESOURCE';
											break;
										case 'u':
											$cutype = 'INDIVIDUAL';
											break;
										default:
											$cutype = 'UNKNOWN';
											$cutype = 'INDIVIDUAL';
											break;
									};
									$parameters['ATTENDEE'][] = array(
										'CN'       => $cn, 
										'ROLE'     => $role, 
										'PARTSTAT' => $status, 
										'CUTYPE'   => $cutype,
										'RSVP'     => $rsvp,
									);
								}
								break;
								
			            			case 'CLASS':
			            				$attributes['CLASS'] = $event['public'] ? 'PUBLIC' : 'PRIVATE';
		        	    				break;
		        	    				
		            				case 'ORGANIZER':	// according to iCalendar standard, ORGANIZER not used for events in the own calendar
		            					if (!isset($event['participants'][$event['owner']]) || count($event['participants']) > 1)
		            					{
									$mailtoOrganizer = $GLOBALS['egw']->accounts->id2name($event['owner'],'account_email');
									$attributes['ORGANIZER'] = $mailtoOrganizer ? 'MAILTO:'.$mailtoOrganizer : '';
									$parameters['ORGANIZER']['CN'] = trim($GLOBALS['egw']->accounts->id2name($event['owner'],'account_firstname').' '.
										$GLOBALS['egw']->accounts->id2name($event['owner'],'account_lastname'));
		            					}
								break;
								
							case 'DTEND':
								if(date('H:i:s',$event['end']) == '23:59:59') $event['end']++;
								if(date('H:i:s',$event['end']) == '23:59:00') $event['end']+=60; // needed by old eGW whole-day events
		            					$attributes[$icalFieldName]	= $event['end'];
		            					break;
		            					
							case 'RRULE':
								if ($event['recur_type'] == MCAL_RECUR_NONE) break;		// no recuring event
								if ($version == '1.0') {
									$interval = ($event['recur_interval'] > 1) ? $event['recur_interval'] : 1;
									$rrule = array('FREQ' => $this->recur_egw2ical_1_0[$event['recur_type']].$interval);
									switch ($event['recur_type'])
									{
	            								case MCAL_RECUR_WEEKLY:
	            									$days = array();
	            									foreach($this->recur_days_1_0 as $id => $day)
	            									{
	            										if ($event['recur_data'] & $id) $days[] = strtoupper(substr($day,0,2));
											}
		            								$rrule['BYDAY'] = implode(' ',$days);
		            								$rrule['FREQ'] = $rrule['FREQ'].' '.$rrule['BYDAY'];
		            								break;
		            							
	        	    							case MCAL_RECUR_MONTHLY_MDAY:	// date of the month: BYMONTDAY={1..31}
	            									break;
	            								
	             								case MCAL_RECUR_MONTHLY_WDAY:	// weekday of the month: BDAY={1..5}{MO..SO}
	             									$rrule['BYDAY'] = (1 + (int) ((date('d',$event['start'])-1) / 7)).'+ '.
		             									strtoupper(substr(date('l',$event['start']),0,2));
		            								$rrule['FREQ'] = $rrule['FREQ'].' '.$rrule['BYDAY'];
											break;
									}

									if ($event['recur_enddate'])
									{
										$recur_enddate = (int)$event['recur_enddate'];
										if ($palm_enddate_workaround)
										{
											$recur_enddate += 86400;
										}
										# append T and the Endtime, since the RRULE seems not to be understood by the client without it
										$rrule['UNTIL'] = date('Ymd',$recur_enddate).'T'.date('His',($event['end']?$event['end']:$event['start'])) ;
									}
									else
									{
										$rrule['UNTIL'] = '#0';
									}

									$attributes['RRULE'] = $rrule['FREQ'].' '.$rrule['UNTIL'];
								} else {
									$rrule = array('FREQ' => $this->recur_egw2ical_2_0[$event['recur_type']]);
									switch ($event['recur_type'])
									{
	            								case MCAL_RECUR_WEEKLY:
	            									$days = array();
	            									foreach($this->recur_days as $id => $day)
	            									{
	            										if ($event['recur_data'] & $id) $days[] = strtoupper(substr($day,0,2));
											}
		            								$rrule['BYDAY'] = implode(',',$days);
		            								break;
		            							
	        	    							case MCAL_RECUR_MONTHLY_MDAY:	// date of the month: BYMONTDAY={1..31}
	            									$rrule['BYMONTHDAY'] = (int) date('d',$event['start']);
	            									break;
	            								
	             								case MCAL_RECUR_MONTHLY_WDAY:	// weekday of the month: BDAY={1..5}{MO..SO}
	             									$rrule['BYDAY'] = (1 + (int) ((date('d',$event['start'])-1) / 7)).
		             									strtoupper(substr(date('l',$event['start']),0,2));
											break;
									}
									if ($event['recur_interval'] > 1) $rrule['INTERVAL'] = $event['recur_interval'];
									if ($event['recur_enddate']) $rrule['UNTIL'] = date('Ymd',$event['recur_enddate']);	// only day is set in eGW

									// no idea how to get the Horde parser to produce a standard conformant
									// RRULE:FREQ=... (note the double colon after RRULE, we cant use the $parameter array)
									// so we create one value manual ;-)
									foreach($rrule as $name => $value)
									{
										$attributes['RRULE'][] = $name . '=' . $value;
									}
									$attributes['RRULE'] = implode(';',$attributes['RRULE']);
								}
								break;
							
							case 'EXDATE':
								if ($event['recur_exception'])
								{
									$days = array();
									foreach($event['recur_exception'] as $day)
									{
										$days[] = date('Ymd',$day);
									}
									$attributes['EXDATE'] = implode(',',$days);
									$parameters['EXDATE']['VALUE'] = 'DATE';
								}
								break;
								
							case 'PRIORITY':
	 							$attributes['PRIORITY'] = (int) $this->priority_egw2ical[$event['priority']];
	 							break;
	 							
	 						case 'TRANSP':
								if ($version == '1.0') {
									$attributes['TRANSP'] = $event['non_blocking'] ? 1 : 0;
								} else {
									$attributes['TRANSP'] = $event['non_blocking'] ? 'TRANSPARENT' : 'OPAQUE';
								}
								break;
								
							case 'CATEGORIES':
								if ($event['category'])
								{
									$attributes['CATEGORIES'] = implode(',',$this->get_categories($event['category']));
								}
								break;

							default:
								if ($event[$egwFieldInfo['dbName']])	// dont write empty fields
								{
									$attributes[$icalFieldName]	= $event[$egwFieldInfo['dbName']];
								}
								break;
						}
					}
				}
				
				if(strtolower($this->productManufacturer) == 'nokia') {
					if($event['special'] == '1') {
						$attributes['X-EPOCAGENDAENTRYTYPE'] = 'ANNIVERSARY';
						$attributes['DTEND'] = $attributes['DTSTART'];
					} else {
						$attributes['X-EPOCAGENDAENTRYTYPE'] = 'APPOINTMENT';
					}
				}
				
				$modified = $GLOBALS['egw']->contenthistory->getTSforAction($eventGUID,'modify');
				$created = $GLOBALS['egw']->contenthistory->getTSforAction($eventGUID,'add');
				if (!$created && !$modified) $created = $event['modified'];
				if ($created) $attributes['CREATED'] = $created;
				if (!$modified) $modified = $event['modified'];
				if ($modified) $attributes['LAST-MODIFIED'] = $modified;
				
				foreach($event['alarm'] as $alarmID => $alarmData)
				{
					$attributes['DALARM'] = $vcal->_exportDateTime($alarmData['time']);
					$attributes['AALARM'] = $vcal->_exportDateTime($alarmData['time']);
					// lets take only the first alarm
					break;
				}
				
				$attributes['UID'] = $eventGUID;

				foreach($attributes as $key => $value)
				{
					foreach(is_array($value) ? $value : array($value) as $valueID => $valueData)
					{
						$valueData = $GLOBALS['egw']->translation->convert($valueData,$GLOBALS['egw']->translation->charset(),'UTF-8');
						$paramData = (array) $GLOBALS['egw']->translation->convert(is_array($value) ? $parameters[$key][$valueID] : $parameters[$key],
							$GLOBALS['egw']->translation->charset(),'UTF-8');
						//echo "$key:$valueID: value=$valueData, param=".print_r($paramDate,true)."\n";
						$vevent->setAttribute($key, $valueData, $paramData);
						$options = array();
						if($key != 'RRULE' && preg_match('/([\000-\012\015\016\020-\037\075])/',$valueData))
						{
							$options['ENCODING'] = 'QUOTED-PRINTABLE';
						}
						if(preg_match('/([\177-\377])/',$valueData))
						{
							$options['CHARSET'] = 'UTF-8';
						}
						$vevent->setParameter($key, $options);
					}
				}
				$vcal->addComponent($vevent);
			}
			//_debug_array($vcal->exportvCalendar());
			
			return $vcal->exportvCalendar();
		}
		
		function importVCal($_vcalData, $cal_id=-1)
		{
			// our (patched) horde classes, do NOT unfold folded lines, which causes a lot trouble in the import
			$_vcalData = preg_replace("/[\r\n]+ /",'',$_vcalData);

			$vcal = &new Horde_iCalendar;
			if(!$vcal->parsevCalendar($_vcalData)) {
				return FALSE;
			}
			
			$version = $vcal->getAttribute('VERSION');
			
			if(!is_array($this->supportedFields))
			{
				$this->setSupportedFields();
			}
			//echo "supportedFields="; _debug_array($this->supportedFields);

			$syncevo_enddate_fix = False;
			if( $this->productManufacturer == '' && $this->productName == '' )
			{
				// syncevolution needs an adjusted recur_enddate
				$syncevo_enddate_fix = True;
			}

			$Ok = false;	// returning false, if file contains no components
			foreach($vcal->getComponents() as $component)
			{
				if(is_a($component, 'Horde_iCalendar_vevent'))
				{
					$supportedFields = $this->supportedFields;
					#$event = array('participants' => array());
					$event		= array();
					$alarms		= array();
					$vcardData	= array(
						'recur_type'		=> MCAL_RECUR_NONE,
						'recur_exception'	=> array(),
					);
					
					// lets see what we can get from the vcard
					foreach($component->_attributes as $attributes) 
					{
						switch($attributes['name']) 
						{
							case 'AALARM':
							case 'DALARM':
								if (preg_match('/.*Z$/',$attributes['value'],$matches)) {
									$alarmTime = $vcal->_parseDateTime($attributes['value']);
									$alarms[$alarmTime] = array(
										'time' => $alarmTime
									);
								} elseif (preg_match('/(........T......);;(\d*);$/',$attributes['value'],$matches)) {
									//error_log(print_r($matches,true));
									$alarmTime = $vcal->_parseDateTime($matches[1]);
									$alarms[$alarmTime] = array(
										'time' => $alarmTime
									);
								} elseif (preg_match('/(........T......Z);;(\d*);$/',$attributes['value'],$matches)) {
									//error_log(print_r($matches,true));
									$alarmTime = $vcal->_parseDateTime($matches[1]);
									$alarms[$alarmTime] = array(
										'time' => $alarmTime
									);
								} elseif (preg_match('/(........T......)$/',$attributes['value'],$matches)) {
									$alarmTime = $vcal->_parseDateTime($attributes['value']);
									$alarms[$alarmTime] = array(
										'time' => $alarmTime
									);
								}
								break;
							case 'CLASS':
								$vcardData['public']		= (int)(strtolower($attributes['value']) == 'public');
								break;
							case 'DESCRIPTION':
								$vcardData['description']	= $attributes['value'];
								break;
							case 'DTEND':
								$dtend_ts = is_numeric($attributes['value']) ? $attributes['value'] : $this->date2ts($attributes['value']);
								if(date('H:i:s',$dtend_ts) == '00:00:00') {
									$dtend_ts -= 60;
								}
								$vcardData['end']		= $dtend_ts;
								break;
							case 'DTSTART':
								$vcardData['start']		= $attributes['value'];
								break;
							case 'LOCATION':
								$vcardData['location']	= $attributes['value'];
								break;
							case 'RRULE':
								$recurence = $attributes['value'];
								$type = preg_match('/FREQ=([^;: ]+)/i',$recurence,$matches) ? $matches[1] : $recurence{0};
								// vCard 2.0 values for all types
								if (preg_match('/UNTIL=([0-9T]+)/',$recurence,$matches))
								{
									$vcardData['recur_enddate'] = $vcal->_parseDateTime($matches[1]);
								}
								elseif (preg_match('/COUNT=([0-9]+)/',$recurence,$matches))
								{
									$vcardData['recur_count'] = (int)$matches[1];
								}
								if (preg_match('/INTERVAL=([0-9]+)/',$recurence,$matches))
								{
									// 1 is invalid,, egw uses 0 for interval
									$vcardData['recur_interval'] = (int) $matches[1] != 0 ? (int) $matches[1] : 0;
								}
								$vcardData['recur_data'] = 0;
								switch($type)
								{
									case 'W':
									case 'WEEKLY':
										$days = array();
										if(preg_match('/W(\d+) (.*) (.*)/',$recurence, $recurenceMatches))		// 1.0
										{
											$vcardData['recur_interval'] = $recurenceMatches[1];
											$days = explode(' ',trim($recurenceMatches[2]));
											if($recurenceMatches[3] != '#0')
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[3]);
											$recur_days = $this->recur_days_1_0;
										}
										elseif (preg_match('/BYDAY=([^;: ]+)/',$recurence,$recurenceMatches))	// 2.0
										{
											$days = explode(',',$recurenceMatches[1]);
											$recur_days = $this->recur_days;
										}
										if ($days)
										{
											foreach($recur_days as $id => $day)
				            						{
				            							if (in_array(strtoupper(substr($day,0,2)),$days))
		            									{
		            										$vcardData['recur_data'] |= $id;
		            									}
		            								}
											$vcardData['recur_type'] = MCAL_RECUR_WEEKLY;
										}

										if (!empty($vcardData['recur_count']))
										{
											$vcardData['recur_enddate'] = mktime(0,0,0,
												date('m',$vcardData['start']),
												date('d',$vcardData['start']) + ($vcardData['recur_interval']*($vcardData['recur_count']-1)*7),
												date('Y',$vcardData['start']));
										}
										break;
									
									case 'D':	// 1.0
										if(preg_match('/D(\d+) #(.\d)/', $recurence, $recurenceMatches)) {
											$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[2] > 0 && $vcardData['end']) {
												$vcardData['recur_enddate'] = mktime(
													date('H', $vcardData['end']),
													date('i', $vcardData['end']),
													date('s', $vcardData['end']),
													date('m', $vcardData['end']),
													date('d', $vcardData['end']) + ($recurenceMatches[2] * $vcardData['recur_interval']),
													date('Y', $vcardData['end'])
												);
											}
										} elseif(preg_match('/D(\d+) (.*)/', $recurence, $recurenceMatches)) {
											$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[2] != '#0') {
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[2]);
											}
										} else {
											break;
										}
										// fall-through
									case 'DAILY':	// 2.0
										$vcardData['recur_type'] = MCAL_RECUR_DAILY;

										if (!empty($vcardData['recur_count']))
										{
											$vcardData['recur_enddate'] = mktime(0,0,0,
												date('m',$vcardData['start']),
												date('d',$vcardData['start']) + ($vcardData['recur_interval']*($vcardData['recur_count']-1)),
												date('Y',$vcardData['start']));
										}
										break;

									case 'M':
										if(preg_match('/MD(\d+) #(.\d)/', $recurence, $recurenceMatches)) {
											$vcardData['recur_type'] = MCAL_RECUR_MONTHLY_MDAY;
											$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[2] > 0 && $vcardData['end']) {
												$vcardData['recur_enddate'] = mktime(
													date('H', $vcardData['end']),
													date('i', $vcardData['end']),
													date('s', $vcardData['end']),
													date('m', $vcardData['end']) + ($recurenceMatches[2] * $vcardData['recur_interval']),
													date('d', $vcardData['end']),
													date('Y', $vcardData['end'])
												);
											}
										} elseif(preg_match('/MD(\d+) (.*)/',$recurence, $recurenceMatches)) {
											$vcardData['recur_type'] = MCAL_RECUR_MONTHLY_MDAY;
											if($recurenceMatches[1] > 1)
												$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[2] != '#0')
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[2]);
										} elseif(preg_match('/MP(\d+) (.*) (.*) (.*)/',$recurence, $recurenceMatches)) {
											$vcardData['recur_type'] = MCAL_RECUR_MONTHLY_WDAY;
											if($recurenceMatches[1] > 1)
												$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[4] != '#0')
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[4]);
										}
										break;
									case 'MONTHLY':
										$vcardData['recur_type'] = strpos($recurence,'BYDAY') !== false ? 
											MCAL_RECUR_MONTHLY_WDAY : MCAL_RECUR_MONTHLY_MDAY;

										if (!empty($vcardData['recur_count']))
										{
											$vcardData['recur_enddate'] = mktime(0,0,0,
												date('m',$vcardData['start']) + ($vcardData['recur_interval']*($vcardData['recur_count']-1)),
												date('d',$vcardData['start']),
												date('Y',$vcardData['start']));
										}
										break;										

									case 'Y':		// 1.0
										if(preg_match('/YM(\d+) #(.\d)/', $recurence, $recurenceMatches)) {
											$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[2] > 0 && $vcardData['end']) {
												$vcardData['recur_enddate'] = mktime(
													date('H', $vcardData['end']),
													date('i', $vcardData['end']),
													date('s', $vcardData['end']),
													date('m', $vcardData['end']),
													date('d', $vcardData['end']),
													date('Y', $vcardData['end']) + ($recurenceMatches[2] * $vcardData['recur_interval'])
												);
											}
										} elseif(preg_match('/YM(\d+) (.*)/',$recurence, $recurenceMatches)) {
											$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[2] != '#0') {
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[2]);
											}
										} else {
											break;
										}
										// fall-through
									case 'YEARLY':	// 2.0
										$vcardData['recur_type'] = MCAL_RECUR_YEARLY;

										if (!empty($vcardData['recur_count']))
										{
											$vcardData['recur_enddate'] = mktime(0,0,0,
												date('m',$vcardData['start']),
												date('d',$vcardData['start']),
												date('Y',$vcardData['start']) + ($vcardData['recur_interval']*($vcardData['recur_count']-1)));
										}
										break;
								}
								if( $syncevo_enddate_fix && $vcardData['recur_enddate'] )
								{
									// Does syncevolution need to adjust recur_enddate
									$vcardData['recur_enddate'] = (int)$vcardData['recur_enddate'] + 86400;
								}
								break;
							case 'EXDATE':
								$vcardData['recur_exception'] = array_merge($vcardData['recur_exception'],$attributes['value']);
								break;
							case 'SUMMARY':
								$vcardData['title']		= $attributes['value'];
								break;
							case 'UID':
								$event['uid'] = $vcardData['uid'] = $attributes['value'];
								if ($cal_id <= 0 && !empty($vcardData['uid']) && ($uid_event = $this->read($vcardData['uid'])))
								{
									$event['id'] = $uid_event['id'];
									unset($uid_event);
								}
								break;
	 						case 'TRANSP':
	 							if($version == '1.0') {
	 								$vcardData['non_blocking'] = $attributes['value'] == 1;
	 							} else {
									$vcardData['non_blocking'] = $attributes['value'] == 'TRANSPARENT';
								}
								break;
							case 'PRIORITY':
	 							$vcardData['priority'] = (int) $this->priority_ical2egw[$attributes['value']];
	 							break;
	 						case 'CATEGORIES':
	 							if ($attributes['value'])
	 							{
	 								$vcardData['category'] = $this->find_or_add_categories(explode(',',$attributes['value']));
	 							}
								else
								{
	 								$vcardData['category'] = array();
								}
	 							break;	
	 						case 'ATTENDEE':
	 							if (preg_match('/MAILTO:([@.a-z0-9_-]+)/i',$attributes['value'],$matches) &&
	 								($uid = $GLOBALS['egw']->accounts->name2id($matches[1],'account_email')))
	 							{
	 								$event['participants'][$uid] = isset($attributes['params']['PARTSTAT']) ?
	 									$this->status_ical2egw[strtoupper($attributes['params']['PARTSTAT'])] : 
	 									($uid == $event['owner'] ? 'A' : 'U');
	 							}

	 							if (preg_match('/<([@.a-z0-9_-]+)>/i',$attributes['value'],$matches)) {
	 								$uid = '';
	 								$uid = $GLOBALS['egw']->accounts->name2id($matches[1],'account_email');
	 								if(!empty($uid)) {
	 									$event['participants'][$uid] = isset($attributes['params']['PARTSTAT']) ?
	 										$this->status_ical2egw[strtoupper($attributes['params']['PARTSTAT'])] : 
	 										($uid == $event['owner'] ? 'A' : 'U');
									}
	 							}
	 							
	 							if($attributes['value'] == 'Unknown') {
	 								$event['participants'][$GLOBALS['egw_info']['user']['account_id']] = 'A';
	 							}
	 							
	 							break;
	 						case 'ORGANIZER':	// will be written direct to the event
	 							if (preg_match('/MAILTO:([@.a-z0-9_-]+)/i',$attributes['value'],$matches) &&
	 								($uid = $GLOBALS['egw']->accounts->name2id($matches[1],'account_email')))
	 							{
	 								$event['owner'] = $uid;
	 							}
	 							break;
	 						case 'CREATED':		// will be written direct to the event
	 							if ($event['modified']) break;
	 							// fall through
	 						case 'LAST-MODIFIED':	// will be written direct to the event
								$event['modified'] = $attributes['value'];
								break;
						}
					}

					// check if the entry is a birthday 
					// this field is only set from NOKIA clients
					$agendaEntryType = $component->getAttribute('X-EPOCAGENDAENTRYTYPE');
					if (!is_a($agendaEntryType, 'PEAR_Error')) {
						if(strtolower($agendaEntryType) == 'anniversary') {
							$event['special'] = '1';
							// make it a whole day event for eGW
							$vcardData['end'] = $vcardData['start'] + 86399;
						}
					}
					
					if(!empty($vcardData['recur_enddate']))
					{
						// reset recure_enddate to 00:00:00 on the last day
						$vcardData['recur_enddate'] = mktime(0, 0, 0, 
							date('m',$vcardData['recur_enddate']),
							date('d',$vcardData['recur_enddate']),
							date('Y',$vcardData['recur_enddate'])
						);
					}
					//echo "event=";_debug_array($vcardData);
					
					// now that we know what the vard provides, we merge that data with the information we have about the device
					$event['priority']		= 2;
					if($cal_id > 0)
					{
						$event['id'] = $cal_id;
					}
					while(($fieldName = array_shift($supportedFields)))
					{
						switch($fieldName)
						{
							case 'alarms':
								// not handled here
								break;
							case 'recur_type':
								$event['recur_type'] = $vcardData['recur_type'];
								if ($event['recur_type'] != MCAL_RECUR_NONE)
								{
									foreach(array('recur_interval','recur_enddate','recur_data','recur_exception') as $r)
									{
										if(isset($vcardData[$r]))
										{
											$event[$r] = $vcardData[$r];
										}
									}
								}
								unset($supportedFields['recur_type']);
								unset($supportedFields['recur_interval']);
								unset($supportedFields['recur_enddate']);
								unset($supportedFields['recur_data']);
								break;
							default:
								if (isset($vcardData[$fieldName]))
								{
									$event[$fieldName] = $vcardData[$fieldName];
								}
								unset($supportedFields[$fieldName]);
								break;
						}
					}
					
					// add ourself to new events as participant
	 				if($cal_id == -1 && !isset($this->supportedFields['participants']))
	 				{
						$event['participants'] = array($GLOBALS['egw_info']['user']['account_id'] => 'A');
	 				}

					// If this is an updated meeting, and the client doesn't support
					// participants, add them back
					if( $cal_id >0 && !isset($this->supportedFields['participants']))
					{
						$egw_event = $this->read($cal_id);
						if ($egw_event)
						{
							$event['participants'] = $egw_event['participants'];
							$event['participant_types'] = $egw_event['participant_types'];
						}
					}

					// Check for resources, and don't remove them
					if( $cal_id > 0 )
					{
						// for each existing participant:
						$egw_event = $this->read($cal_id);
						if ( $egw_event )
						{ 
							foreach( $egw_event['participants'] as $uid => $status )
							{
								// Is it a resource?
								if ( preg_match("/^r(.*)/", $uid, $matches) )
								{
									// Add it back in
									$event['participants'][$uid] = 'A';
									$event['participant_types']['r'][$matches[1]] = 'A';
								}
							}
						}
					}

					#error_log('ALARMS');
					#error_log(print_r($event, true));
					
					if (!($Ok = $this->update($event, TRUE))) {
						break;	// stop with the first error
					}
					else
					{
						$eventID =& $Ok;

						// handle the alarms
						if(count($alarms) > 0 || (isset($this->supportedFields['alarms'])  && count($alarms) == 0))
						{
							// delete the old alarms
							$updatedEvent = $this->read($eventID);
							foreach($updatedEvent['alarm'] as $alarmID => $alarmData)
							{
								$this->delete_alarm($alarmID);
							}
						}
						
						foreach($alarms as $alarm)
						{
							$alarm['offset'] = $event['start'] - $alarm['time'];
							$alarm['owner'] = $GLOBALS['egw_info']['user']['account_id'];
							$this->save_alarm($eventID, $alarm);
						}
					}
				}
			}
			return $Ok;
		}

		function setSupportedFields($_productManufacturer='file', $_productName='')
		{
			// save them vor later use
			$this->productManufacturer = $_productManufacturer;
			$this->productName = $_productName;

			$defaultFields['minimal'] = array(
				'public'			=> 'public',
				'description'		=> 'description',
				'end'				=> 'end',
				'start'				=> 'start',
				'location'			=> 'location',
				'recur_type'		=> 'recur_type',
				'recur_interval'	=> 'recur_interval',
				'recur_data'		=> 'recur_data',
				'recur_enddate'		=> 'recur_enddate',
				'title'				=> 'title',
				'alarms'			=> 'alarms', 
			);

			$defaultFields['basic'] = $defaultFields['minimal'] + array(
				'recur_exception'	=> 'recur_exception',
				'priority'			=> 'priority',
			);

			$defaultFields['nexthaus'] = $defaultFields['basic'] + array(
				'participants'		=> 'participants',
			);
			
			$defaultFields['synthesis'] = $defaultFields['basic'] + array(
				'non_blocking'		=> 'non_blocking',
				'category'			=> 'category',
			);
			
			$defaultFields['evolution'] = $defaultFields['basic'] + array(
				'participants'		=> 'participants',
				'owner'				=> 'owner',
				'category'			=> 'category',
			);

			$defaultFields['full'] = $defaultFields['basic'] + array(
				'participants'		=> 'participants',
				'owner'				=> 'owner',
				'category'			=> 'category',
				'non_blocking'		=> 'non_blocking',
			);
			
			
			switch(strtolower($_productManufacturer))
			{
				case 'nexthaus corporation':
					switch(strtolower($_productName))
					{
						default:
							$this->supportedFields = $defaultFields['nexthaus'];
							break;
					}
					break;

				// multisync does not provide anymore information then the manufacturer
				// we suppose multisync with evolution
				case 'the multisync project':
					switch(strtolower($_productName))
					{
						default:
							$this->supportedFields = $defaultFields['basic'];
							break;
					}
					break;

				case 'nokia':
					switch(strtolower($_productName))
					{
						case 'e61':
							$this->supportedFields = $defaultFields['minimal'];
							break;
						default:
							error_log("Unknown Nokia phone '$_productName', assuming E61");
							$this->supportedFields = $defaultFields['minimal'];
							break;
					}
					break;

				case 'sonyericsson':
				case 'sony ericsson':
					switch(strtolower($_productName))
					{
						case 'd750i':
						case 'p910i':
							$this->supportedFields = $defaultFields['basic'];
							break;
						default:
							error_log("Unknown Sony Ericsson phone '$_productName' assuming d750i");
							$this->supportedFields = $defaultFields['basic'];
							break;
					}
					break;
					
				case 'synthesis ag':
					switch(strtolower($_productName))
					{
						case 'sysync client pocketpc std':
						case 'sysync client pocketpc pro':
							$this->supportedFields = $defaultFields['full'];
							break;
						default:
							$this->supportedFields = $defaultFields['synthesis'];
							break;
					}
					break;

				//Syncevolution compatibility	
				case 'patrick ohly':
					$this->supportedFields = $defaultFields['evolution'];
					break;

				case '': // seems syncevolution 0.5 doesn't send a manufacturer
					error_log("No vendor name, assuming syncevolution 0.5");
					$this->supportedFields = $defaultFields['evolution'];
					break;
					
				case 'file':	// used outside of SyncML, eg. by the calendar itself ==> all possible fields
					$this->supportedFields = $defaultFields['full'];
					break;

				// the fallback for SyncML
				default:
					error_log("Unknown calendar SyncML client: manufacturer='$_productManufacturer'  product='$_productName'");
					$this->supportedFields = $defaultFields['full'];
					break;
			}
		}
		
		function icaltoegw($_vcalData)
		{
			// our (patched) horde classes, do NOT unfold folded lines, which causes a lot trouble in the import
			$_vcalData = preg_replace("/[\r\n]+ /",'',$_vcalData);

			$vcal = &new Horde_iCalendar;
			if(!$vcal->parsevCalendar($_vcalData))
			{
				return FALSE;
			}

			if(!is_array($this->supportedFields))
			{
				$this->setSupportedFields();
			}
			//echo "supportedFields="; _debug_array($this->supportedFields);

			$Ok = false;	// returning false, if file contains no components
			foreach($vcal->getComponents() as $component)
			{
				if(is_a($component, 'Horde_iCalendar_vevent'))
				{
					$supportedFields = $this->supportedFields;
					#$event = array('participants' => array());
					$event		= array();
					$alarms		= array();
					$vcardData	= array('recur_type' => 0);
					
					// lets see what we can get from the vcard
					foreach($component->_attributes as $attributes)
					{
						switch($attributes['name'])
						{
							case 'AALARM':
							case 'DALARM':
								if (preg_match('/.*Z$/',$attributes['value'],$matches))
								{
									$alarmTime = $vcal->_parseDateTime($attributes['value']);
									$alarms[$alarmTime] = array(
										'time' => $alarmTime
									);
								}
								break;
							case 'CLASS':
								$vcardData['public']		= (int)(strtolower($attributes['value']) == 'public');
								break;
							case 'DESCRIPTION':
								$vcardData['description']	= $attributes['value'];
								break;
							case 'DTEND':
								if(date('H:i:s',$attributes['value']) == '00:00:00')
									$attributes['value']--;
								$vcardData['end']		= $attributes['value'];
								break;
							case 'DTSTART':
								$vcardData['start']		= $attributes['value'];
								break;
							case 'LOCATION':
								$vcardData['location']	= $attributes['value'];
								break;
							case 'RRULE':
								$recurence = $attributes['value'];
								$type = preg_match('/FREQ=([^;: ]+)/i',$recurence,$matches) ? $matches[1] : $recurence{0};
								// vCard 2.0 values for all types
								if (preg_match('/UNTIL=([0-9T]+)/',$recurence,$matches))
								{
									$vcardData['recur_enddate'] = $vcal->_parseDateTime($matches[1]);
								}
								if (preg_match('/INTERVAL=([0-9]+)/',$recurence,$matches))
								{
									$vcardData['recur_interval'] = (int) $matches[1];
								}
								$vcardData['recur_data'] = 0;
								switch($type)
								{
									case 'W':
									case 'WEEKLY':
										$days = array();
										if(preg_match('/W(\d+) (.*) (.*)/',$recurence, $recurenceMatches))		// 1.0
										{
											$vcardData['recur_interval'] = $recurenceMatches[1];
											$days = explode(' ',trim($recurenceMatches[2]));
											if($recurenceMatches[3] != '#0')
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[3]);
											$recur_days = $this->recur_days_1_0;
										}
										elseif (preg_match('/BYDAY=([^;: ]+)/',$recurence,$recurenceMatches))	// 2.0
										{
											$days = explode(',',$recurenceMatches[1]);
											$recur_days = $this->recur_days;
										}
										if ($days)
										{
											foreach($recur_days as $id => $day)
				            						{
				            							if (in_array(strtoupper(substr($day,0,2)),$days))
		            									{
		            										$vcardData['recur_data'] |= $id;
		            									}
		            								}
											$vcardData['recur_type'] = MCAL_RECUR_WEEKLY;
										}
										break;
									
									case 'D':		// 1.0
										if(!preg_match('/D(\d+) (.*)/',$recurence, $recurenceMatches)) break;
										$vcardData['recur_interval'] = $recurenceMatches[1];
										if($recurenceMatches[2] != '#0')
											$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[2]);
										// fall-through
									case 'DAILY':	// 2.0
										$vcardData['recur_type'] = MCAL_RECUR_DAILY;
										break;

									case 'M':
										if(preg_match('/MD(\d+) (.*)/',$recurence, $recurenceMatches))
										{
											$vcardData['recur_type'] = MCAL_RECUR_MONTHLY_MDAY;
											if($recurenceMatches[1] > 1)
												$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[2] != '#0')
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[2]);
										}
										elseif(preg_match('/MP(\d+) (.*) (.*) (.*)/',$recurence, $recurenceMatches))
										{
											$vcardData['recur_type'] = MCAL_RECUR_MONTHLY_WDAY;
											if($recurenceMatches[1] > 1)
												$vcardData['recur_interval'] = $recurenceMatches[1];
											if($recurenceMatches[4] != '#0')
												$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[4]);
										}
										break;
									case 'MONTHLY':
										$vcardData['recur_type'] = strpos($recurence,'BYDAY') !== false ? 
											MCAL_RECUR_MONTHLY_WDAY : MCAL_RECUR_MONTHLY_MDAY;
										break;										

									case 'Y':		// 1.0
										if(!preg_match('/YM(\d+) (.*)/',$recurence, $recurenceMatches)) break;
										$vcardData['recur_interval'] = $recurenceMatches[1];
										if($recurenceMatches[2] != '#0')
											$vcardData['recur_enddate'] = $vcal->_parseDateTime($recurenceMatches[2]);
										// fall-through
									case 'YEARLY':	// 2.0
										$vcardData['recur_type'] = MCAL_RECUR_YEARLY;
										break;
								}
								break;
							case 'EXDATE':
								$vcardData['recur_exception'] = $attributes['value'];
								break;
							case 'SUMMARY':
								$vcardData['title']		= $attributes['value'];
								break;
							case 'UID':
								$event['uid'] = $vcardData['uid'] = $attributes['value'];
								if ($cal_id <= 0 && !empty($vcardData['uid']) && ($uid_event = $this->read($vcardData['uid'])))
								{
									$event['id'] = $uid_event['id'];
									unset($uid_event);
								}
								break;
	 						case 'TRANSP':
								$vcardData['non_blocking'] = $attributes['value'] == 'TRANSPARENT';
								break;
							case 'PRIORITY':
								if ($this->productManufacturer == 'nexthaus corporation')
								{
									$vcardData['priority'] = $attributes['value'] == 1 ? 3 : 2; // 1=high, 2=normal
								}
								else
								{
	 								$vcardData['priority'] = (int) $this->priority_ical2egw[$attributes['value']];
								}
	 							break;
	 						case 'CATEGORIES':
	 							if ($attributes['value'])
	 							{
									$vcardData['category'] = $this->find_or_add_categories(explode(',',$attributes['value']));
								}
								else
								{
	 								$vcardData['category'] = array();
								}
	 							break;	
	 						case 'ATTENDEE':
	 							if (preg_match('/MAILTO:([@.a-z0-9_-]+)/i',$attributes['value'],$matches) &&
	 								($uid = $GLOBALS['egw']->accounts->name2id($matches[1],'account_email')))
	 							{
	 								$event['participants'][$uid] = isset($attributes['params']['PARTSTAT']) ?
	 									$this->status_ical2egw[strtoupper($attributes['params']['PARTSTAT'])] : 
	 									($uid == $event['owner'] ? 'A' : 'U');
	 							}
	 							break;
	 						case 'ORGANIZER':	// will be written direct to the event
	 							if (preg_match('/MAILTO:([@.a-z0-9_-]+)/i',$attributes['value'],$matches) &&
	 								($uid = $GLOBALS['egw']->accounts->name2id($matches[1],'account_email')))
	 							{
	 								$event['owner'] = $uid;
	 							}
	 							break;
	 						case 'CREATED':		// will be written direct to the event
	 							if ($event['modified']) break;
	 							// fall through
	 						case 'LAST-MODIFIED':	// will be written direct to the event
								$event['modified'] = $attributes['value'];
								break;
						}
					}
					
					// check if the entry is a birthday 
					// this field is only set from NOKIA clients
					$agendaEntryType = $component->getAttribute('X-EPOCAGENDAENTRYTYPE');
					if (!is_a($agendaEntryType, 'PEAR_Error')) {
						if(strtolower($agendaEntryType) == 'anniversary') {
							$event['special'] = '1';
							$vcardData['end'] = $vcardData['start'] + 86399;
						}
					}
					
					if(!empty($vcardData['recur_enddate']))
					{
						// reset recure_enddate to 00:00:00 on the last day
						$vcardData['recur_enddate'] = mktime(0, 0, 0, 
							date('m',$vcardData['recur_enddate']),
							date('d',$vcardData['recur_enddate']),
							date('Y',$vcardData['recur_enddate'])
						);
					}
					//echo "event=";_debug_array($vcardData);
					
					while(($fieldName = array_shift($supportedFields)))
					{
						switch($fieldName)
						{
							case 'recur_interval':
							case 'recur_enddate':
							case 'recur_data':
							case 'recur_exception':
							case 'alarms':
								// not handled here
								break;
							case 'recur_type':
								$event['recur_type'] = $vcardData['recur_type'];
								if ($event['recur_type'] != MCAL_RECUR_NONE)
								{
									foreach(array('recur_interval','recur_enddate','recur_data','recur_exception') as $r)
									{
										if(isset($vcardData[$r]))
										{
											$event[$r] = $vcardData[$r];
										}
									}
								}
								break;
							default:
								if (isset($vcardData[$fieldName]))
								{
									$event[$fieldName] = $vcardData[$fieldName];
								}
								break;
						}
					}
					
					return $event;
				}
			}
			
			return false;
		}

		function search($_vcalData) 
		{
			if(!$event = $this->icaltoegw($_vcalData)) {
				return false;
			}
			
			$query = array(
				'cal_start='.$this->date2ts($event['start'],true),	// true = Server-time
				'cal_end='.$this->date2ts($event['end'],true),
			);
			
			#foreach(array('title','location','priority','public','non_blocking') as $name) {
			foreach(array('title','location','public','non_blocking') as $name) {
				if (isset($event[$name])) $query['cal_'.$name] = $event[$name];
			}

			if($foundEvents = parent::search(array(
				'user'  => $this->user,
				'query' => $query,
			))) {
				if(is_array($foundEvents)) {
					$event = array_shift($foundEvents);
					return $event['id'];
				}
			}
			return false;
		}
		
		/**
		 * Create a freebusy vCal for the given user(s)
		 *
		 * @param int $user account_id
		 * @param mixed $end=null end-date, default now+1 month
		 * @return string
		 */
		function freebusy($user,$end=null)
		{
			if (!$end) $end = $this->now_su + 100*DAY_s;	// default next 100 days
			
			$vcal = &new Horde_iCalendar;
			$vcal->setAttribute('PRODID','-//eGroupWare//NONSGML eGroupWare Calendar '.$GLOBALS['egw_info']['apps']['calendar']['version'].'//'.
				strtoupper($GLOBALS['egw_info']['user']['preferences']['common']['lang']));
			$vcal->setAttribute('VERSION','2.0');

			$vfreebusy = Horde_iCalendar::newComponent('VFREEBUSY',$vcal);
			$parameters = array(
				'ORGANIZER' => $GLOBALS['egw']->translation->convert(
					$GLOBALS['egw']->accounts->id2name($user,'account_firstname').' '.
					$GLOBALS['egw']->accounts->id2name($user,'account_lastname'),
					$GLOBALS['egw']->translation->charset(),'utf-8'),
			);
			foreach(array(
				'URL' => $this->freebusy_url($user),
				'DTSTART' => $this->date2ts($this->now_su,true),	// true = server-time
				'DTEND' => $this->date2ts($end,true),	// true = server-time
			  	'ORGANIZER' => $GLOBALS['egw']->accounts->id2name($user,'account_email'),
				'DTSTAMP' => time(),
			) as $attr => $value)
			{
				$vfreebusy->setAttribute($attr, $value, $parameters[$name]);
			}
			$fbdata = parent::search(array(
						'start' => $this->now_su,
						'end'   => $end,
						'users' => $user,
						'date_format' => 'server',
						'show_rejected' => false,
					));
			if (is_array($fbdata))
			{
				foreach ($fbdata as $event)
				{
					if ($event['non_blocking']) continue;

					$vfreebusy->setAttribute('FREEBUSY',array(array(
						'start' => $event['start'],
						'end' => $event['end'],
					)));
				}
			}
			$vcal->addComponent($vfreebusy);

			return $vcal->exportvCalendar();
		}
	}