* Calendar: fix generating/importing exceptions on recurring events using explicit RDATEs instead of a RRULE

also correctly recognize Windows timezone names without "Standard Time" postfix like "Romance" instead of "Romance Standard Time" for "Europe/Paris"

calendar/inc/class.calendar_bo.inc.php

@@ -128,7 +128,8 @@ class calendar_bo
 		MCAL_RECUR_WEEKLY       => 'Weekly',
 		MCAL_RECUR_MONTHLY_WDAY => 'Monthly (by day)',
 		MCAL_RECUR_MONTHLY_MDAY => 'Monthly (by date)',
-		MCAL_RECUR_YEARLY       => 'Yearly'
+		MCAL_RECUR_YEARLY       => 'Yearly',
+		MCAL_RECUR_RDATE/*calendar_rrule::PERIOD*/ => 'Explicit dates',
 	);
 	/**
 	 * @var array recur_days translates MCAL recur-days to verbose labels
@@ -946,7 +947,7 @@ class calendar_bo
 		foreach($events as $event)
 		{
 			// PERIOD
-			$is_exception = $event['recur_type'] != calendar_rrule::PERIOD && in_array(Api\DateTime::to($event['start'], true), $exceptions);
+			$is_exception = in_array(Api\DateTime::to($event['start'], true), $exceptions);
 			$start = $this->date2ts($event['start'],true);
 			if ($event['whole_day'])
 			{
@@ -1024,10 +1025,11 @@ class calendar_bo
 					$event[$ts] = $this->date2usertime((int)$event[$ts],$date_format);
 				}
 			}
-			// same with the recur exceptions
+			// same with the recur exceptions and rdates
-			if (isset($event['recur_exception']) && is_array($event['recur_exception']))
+			foreach(['recur_exception', 'recur_rdates'] as $name)
 			{
-				foreach($event['recur_exception'] as &$date)
+				if (is_array($event[$name] ?? null)) continue;
+				foreach($event[$name] as &$date)
 				{
 					if ($event['whole_day'] && $date_format != 'server')
 					{
@@ -1139,7 +1141,6 @@ class calendar_bo
 	 * @param mixed $start start-date
 	 * @param mixed $end end-date
 	 * @param array $events where the repetions get inserted
-	 * @param array $recur_exceptions with date (in Ymd) as key (and True as values), seems not to be used anymore
 	 */
 	function insert_all_recurrences($event,$_start,$end,&$events)
 	{
@@ -1165,20 +1166,15 @@ class calendar_bo
 				new Api\DateTime($event['recur_enddate'], calendar_timezones::DateTimeZone($event['tzid']));
 
 		// unset exceptions, as we need to add them as recurrence too, but marked as exception
-		// (Period needs them though)
+		unset($event['recur_exception']);
-		if($event['recur_type'] != calendar_rrule::PERIOD)
-		{
-			unset($event['recur_exception']);
-		}
 		// loop over all recurrences and insert them, if they are after $start
  		$rrule = calendar_rrule::event2rrule($event, !$event['whole_day'], // true = we operate in usertime, like the rest of calendar_bo
 			// For whole day events, just stay in server time
 			$event['whole_day'] ? Api\DateTime::$server_timezone->getName() : Api\DateTime::$user_timezone->getName()
 		);
-		if($event['recur_type'] == calendar_rrule::PERIOD)
+		unset($event['recur_rdates']);
-		{
+		$event['recur_type'] = MCAL_RECUR_NONE;
-			unset($event['recur_exception']);
+
-		}
 		foreach($rrule as $time)
 		{
 			// $time is in timezone of event, convert it to usertime used here
@@ -1194,7 +1190,7 @@ class calendar_bo
 			if (($ts = $this->date2ts($time)) < $start-$event_length)
 			{
 				//echo "<p>".$time." --> ignored as $ts < $start-$event_length</p>\n";
-				continue;	// to early or original event (returned by interator too)
+				continue;	// to early or original event (returned by iterator too)
 			}
 
 			$ts_end = $ts + $event_length;
@@ -1230,7 +1226,7 @@ class calendar_bo
 	}
 
 	/**
-	 * Adds one repetion of $event for $date_ymd to the $events array, after adjusting its start- and end-time
+	 * Adds one repetition of $event for $date_ymd to the $events array, after adjusting its start- and end-time
 	 *
 	 * @param array $events array in which the event gets inserted
 	 * @param array $event event to insert, it has start- and end-date of the first recurrence, not of $date_ymd

calendar/inc/class.calendar_boupdate.inc.php

@@ -1404,7 +1404,7 @@ class calendar_boupdate extends calendar_bo
 		$this->check_reset_statuses($event, $old_event);
 
 		// set recur-enddate/range-end to real end-date of last recurrence
-		if (!empty($event['recur_type']) && $event['recur_enddate'] && $event['start'])
+		if (!empty($event['recur_type']) && (!empty($event['recur_enddate']) || $event['recur_type'] == calendar_rrule::PERIOD) && $event['start'])
 		{
 			$event['recur_enddate'] = new Api\DateTime($event['recur_enddate'], calendar_timezones::DateTimeZone($event['tzid']));
 			$event['recur_enddate']->setTime(23,59,59);
@@ -1485,10 +1485,11 @@ class calendar_boupdate extends calendar_bo
 		{
 			$event['tz_id'] = calendar_timezones::tz2id($event['tzid'] = Api\DateTime::$user_timezone->getName());
 		}
-		// same with the recur exceptions
+		// same with the recur exceptions and rdates
-		if (isset($event['recur_exception']) && is_array($event['recur_exception']))
+		foreach(['recur_exception', 'recur_rdates'] as $name)
 		{
-			foreach($event['recur_exception'] as &$date)
+			if (!is_array($event[$name] ?? null)) continue;
+			foreach($event[$name] as &$date)
 			{
 				if ($event['whole_day'])
 				{
@@ -2400,9 +2401,9 @@ class calendar_boupdate extends calendar_bo
 	 *
 	 * @param array $event	the vCalendar data we try to find
 	 * @param string filter='exact' exact	-> find the matching entry
-	 * 								check	-> check (consitency) for identical matches
+	 * 								check	-> check (consistency) for identical matches
 	 * 							    relax	-> be more tolerant
-	 *                              master	-> try to find a releated series master
+	 *                              master	-> try to find a related series master
 	 * @return array calendar_ids of matching entries
 	 */
 	function find_event($event, $filter='exact')
@@ -3120,12 +3121,12 @@ class calendar_boupdate extends calendar_bo
 			// we convert here from server-time to timestamps in user-time!
 			if (isset($event[$ts])) $event[$ts] = $event[$ts] ? $this->date2usertime($event[$ts]) : 0;
 		}
-		// same with the recur exceptions
+		// same with the recur exceptions and rdates
-		if (isset($event['recur_exception']) && is_array($event['recur_exception']))
+	    foreach(['recur_exception', 'recur_rdates'] as $name)
 		{
-			foreach($event['recur_exception'] as $n => $date)
+			foreach($event[$name] ?? [] as $n => $date)
 			{
-				$event['recur_exception'][$n] = $this->date2usertime($date);
+				$event[$name][$n] = $this->date2usertime($date);
 			}
 		}
 		// same with the alarms
@@ -3137,6 +3138,7 @@ class calendar_boupdate extends calendar_bo
 			}
 		}
     }
+
 	/**
 	 * Delete events that are more than $age years old
 	 *

calendar/inc/class.calendar_ical.inc.php

@@ -2760,10 +2760,10 @@ class calendar_ical extends calendar_boupdate
 					if($attributes['params']['VALUE'] == 'PERIOD')
 					{
 						$vcardData['recur_type'] = calendar_rrule::PERIOD;
-						$vcardData['recur_exception'] = [];
+						$vcardData['recur_rdates'] = [];
 						foreach($attributes['values'] as $date)
 						{
-							$vcardData['recur_exception'][] = mktime(
+							$vcardData['recur_rdates'][] = mktime(
 								$hour,
 								$minutes,
 								$seconds,
@@ -3180,7 +3180,7 @@ class calendar_ical extends calendar_boupdate
 		$event['priority'] = 2; // default
 		$event['alarm'] = $alarms;
 
-		// now that we know what the vard provides,
+		// now that we know what the ical provides,
 		// we merge that data with the information we have about the device
 		while (($fieldName = array_shift($supportedFields)))
 		{
@@ -3191,6 +3191,7 @@ class calendar_ical extends calendar_boupdate
 				case 'recur_data':
 				case 'recur_exception':
 				case 'recur_count':
+				case 'recur_rdates':
 				case 'whole_day':
 					// not handled here
 					break;
@@ -3200,7 +3201,7 @@ class calendar_ical extends calendar_boupdate
 					if ($event['recur_type'] != MCAL_RECUR_NONE)
 					{
 						$event['reference'] = 0;
-						foreach (array('recur_interval','recur_enddate','recur_data','recur_exception','recur_count') as $r)
+						foreach (array('recur_interval','recur_enddate','recur_data','recur_exception','recur_count','recur_rdates') as $r)
 						{
 							if (isset($vcardData[$r]))
 							{

calendar/inc/class.calendar_rrule.inc.php

@@ -45,29 +45,28 @@ class calendar_rrule implements Iterator
 	 */
 	const WEEKLY = 2;
 	/**
-	 * Monthly recurrance iCal: monthly_bymonthday
+	 * Monthly recurrence iCal: monthly_bymonthday
 	 */
 	const MONTHLY_MDAY = 3;
 	/**
-	 * Monthly recurrance iCal: BYDAY (by weekday, eg. 1st Friday of month)
+	 * Monthly recurrence iCal: BYDAY (by weekday, eg. 1st Friday of month)
 	 */
 	const MONTHLY_WDAY = 4;
 	/**
-	 * Yearly recurrance
+	 * Yearly recurrence
 	 */
 	const YEARLY = 5;
 	/**
-	 * Hourly recurrance
+	 * Hourly recurrence
 	 */
 	const HOURLY = 8;
 	/**
-	 * Minutely recurrance
+	 * Minutely recurrence
 	 */
 	const MINUTELY = 7;
 
 	/**
-	 * By date or period
+	 * RDATE: date or period (a list of dates, instead of a RRULE)
-	 * (a list of dates)
 	 */
 	const PERIOD = 9;
 
@@ -226,9 +225,9 @@ class calendar_rrule implements Iterator
 	public $time;
 
 	/**
-	 * Current "position" / time
+	 * Current "position" / time or null, if invalid (out of explicit RDATEs)
 	 *
-	 * @var Api\DateTime
+	 * @var Api\DateTime|null
 	 */
 	public $current;
 
@@ -257,9 +256,10 @@ class calendar_rrule implements Iterator
 	 * @param int $interval =1 1, 2, ...
 	 * @param DateTime $enddate =null enddate or null for no enddate (in which case we user '+5 year' on $time)
 	 * @param int $weekdays =0 self::SUNDAY=1|self::MONDAY=2|...|self::SATURDAY=64
-	 * @param array $exceptions =null DateTime objects with exceptions
+	 * @param DateTime[] $exceptions =null DateTime objects with exceptions
+	 * @param DateTime[] $rdates =null DateTime objects with rdates (for type self::PERIOD)
 	 */
-	public function __construct(DateTime $time,$type,$interval=1,DateTime $enddate=null,$weekdays=0,array $exceptions=null)
+	public function __construct(DateTime $time,$type,$interval=1,DateTime $enddate=null,$weekdays=0,array $exceptions=null,array $rdates=null)
 	{
 		switch($GLOBALS['egw_info']['user']['preferences']['calendar']['weekdaystarts'])
 		{
@@ -319,16 +319,15 @@ class calendar_rrule implements Iterator
 		$this->enddate = $enddate;
 		if($type == self::PERIOD)
 		{
-			foreach($exceptions as $exception)
+			foreach($rdates as $rdate)
 			{
-				$exception->setTimezone($this->time->getTimezone());
+				$rdate->setTimezone($this->time->getTimezone());
-				$this->period[] = $exception;
+				$this->period[] = $rdate;
 			}
 			$enddate = clone(count($this->period) ? end($this->period) : $this->time);
 			// Make sure to include the last date as valid
 			$enddate->modify('+1 second');
 			reset($this->period);
-			unset($exceptions);
 		}
 		// no recurrence --> current date is enddate
 		if ($type == self::NONE)
@@ -413,11 +412,11 @@ class calendar_rrule implements Iterator
 	/**
 	 * Return the current element
 	 *
-	 * @return Api\DateTime
+	 * @return ?Api\DateTime
 	 */
-	public function current(): Api\DateTime
+	public function current(): ?Api\DateTime
 	{
-		return clone $this->current;
+		return $this->current ? clone $this->current : null;
 	}
 
 	/**
@@ -427,7 +426,7 @@ class calendar_rrule implements Iterator
 	 */
 	public function key(): int
 	{
-		return (int)$this->current->format('Ymd');
+		return $this->current ? (int)$this->current->format('Ymd') : 0;
 	}
 
 	/**
@@ -498,14 +497,15 @@ class calendar_rrule implements Iterator
 				$this->current->modify($this->interval.' minute');
 				break;
 			case self::PERIOD:
-				$index = array_search($this->current, $this->period);
+				if (($next = next($this->period)))
-				$next = $this->enddate ?? new Api\DateTime();
-				if($index !== false && $index + 1 < count($this->period))
 				{
-					$next = $this->period[$index + 1];
+					$this->current->setDate($next->format('Y'), $next->format('m'), $next->format('d'));
+					$this->current->setTime($next->format('H'), $next->format('i'), $next->format('s'), 0);
+				}
+				else
+				{
+					$this->current = null;
 				}
-				$this->current->setDate($next->format('Y'), $next->format('m'), $next->format('d'));
-				$this->current->setTime($next->format('H'), $next->format('i'), $next->format('s'), 0);
 				break;
 
 			default:
@@ -522,7 +522,7 @@ class calendar_rrule implements Iterator
 		{
 			$this->next_no_exception();
 		}
-		while($this->exceptions && in_array($this->current->format('Ymd'),$this->exceptions));
+		while($this->current && $this->exceptions && in_array($this->current->format('Ymd'),$this->exceptions));
 	}
 
 	/**
@@ -595,6 +595,10 @@ class calendar_rrule implements Iterator
 	 */
 	public function rewind(): void
 	{
+		if ($this->type == self::PERIOD)
+		{
+			reset($this->period);
+		}
 		$this->current = clone $this->time;
 		while ($this->valid() &&
 			$this->exceptions &&
@@ -612,6 +616,10 @@ class calendar_rrule implements Iterator
 	 */
 	public function validDate(bool $use_just_date=null): bool
 	{
+		if (!$this->current)
+		{
+			return false;
+		}
 		if ($use_just_date)
 		{
 			return $this->current->format('Ymd') <= $this->enddate_ymd;
@@ -626,7 +634,7 @@ class calendar_rrule implements Iterator
 	 */
 	public function valid(): bool
 	{
-		return $this->current->format('ts') < $this->enddate_ts;
+		return $this->current && $this->current->format('ts') < $this->enddate_ts;
 	}
 
 	/**
@@ -853,10 +861,17 @@ class calendar_rrule implements Iterator
 		{
 			foreach($event['recur_exception'] as $exception)
 			{
-				$exceptions[] = is_a($exception,'DateTime') ? $exception : new Api\DateTime($exception,$timestamp_tz);
+				$exceptions[] = is_a($exception,'DateTime') ? $exception : new Api\DateTime($exception, $timestamp_tz);
 			}
 		}
-		return new calendar_rrule($time,$event['recur_type'],$event['recur_interval'],$enddate??null,$event['recur_data'],$exceptions??null);
+		if (is_array($event['recur_rdates']))
+		{
+			foreach($event['recur_rdates'] as $rdate)
+			{
+				$rdates[] = is_a($rdate,'DateTime') ? $rdate : new Api\DateTime($rdate, $timestamp_tz);
+			}
+		}
+		return new calendar_rrule($time,$event['recur_type'],$event['recur_interval'],$enddate??null,$event['recur_data'],$exceptions??null,$rdates??null);
 	}
 
 	/**
@@ -955,6 +970,7 @@ class calendar_rrule implements Iterator
 			'recur_enddate' => $this->enddate ? $this->enddate->format('ts') : null,
 			'recur_data' => $this->weekdays,
 			'recur_exception' => $this->exceptions,
+			'recur_rdates' => $this->period,
 		);
 	}
 

calendar/inc/class.calendar_so.inc.php

@@ -43,6 +43,7 @@ if(!extension_loaded('mcal'))
 	define('MCAL_M_WEEKEND',65);
 	define('MCAL_M_ALLDAYS',127);
 }
+define('MCAL_RECUR_RDATE',9);
 
 define('REJECTED',0);
 define('NO_RESPONSE',1);
@@ -311,7 +312,7 @@ class calendar_so
 	 * All times (start, end and modified) are returned as timesstamps in servertime!
 	 *
 	 * @param int|array|string $ids id or array of id's of the entries to read, or string with a single uid
-	 * @param int $recur_date =0 if set read the next recurrence at or after the timestamp, default 0 = read the initital one
+	 * @param int $recur_date =0 if set read the next recurrence at or after the timestamp, default 0 = read the initial one
 	 * @param boolean $read_recurrence =false true: read the exception, not the series master (only for recur_date && $ids='<uid>'!)
 	 * @return array|boolean array with cal_id => event array pairs or false if entry not found
 	 */
@@ -426,12 +427,21 @@ class calendar_so
 			}
 			if (!(int)$recur_date && !empty($event['recur_type']))
 			{
-				foreach($this->db->select($this->dates_table, 'cal_id,cal_start', array(
+				foreach($this->db->select($this->dates_table, 'cal_id,cal_start,recur_exception', [
 					'cal_id' => $ids,
+				]+($event['recur_type'] == MCAL_RECUR_RDATE ? [] : [
 					'recur_exception' => true,
-				), __LINE__, __FILE__, false, 'ORDER BY cal_id,cal_start', 'calendar') as $row)
+				]), __LINE__, __FILE__, false, 'ORDER BY cal_id,cal_start', 'calendar') as $row)
 				{
-					$events[$row['cal_id']]['recur_exception'][] = $row['cal_start'];
+					if ($row['recur_exception'])
+					{
+						$events[$row['cal_id']]['recur_exception'][] = $row['cal_start'];
+					}
+					// rdates are both, exceptions and regular dates!
+					if ($event['recur_type'] == MCAL_RECUR_RDATE)
+					{
+						$events[$row['cal_id']]['recur_rdates'][] = $row['cal_start'];
+					}
 				}
 				break;	// as above select read all exceptions (and I dont think too short uid problem still exists)
 			}
@@ -1496,7 +1506,7 @@ ORDER BY cal_user_type, cal_usre_id
 
 		if ($cal_id)
 		{
-			// query old recurrance information, before updating main table, where recur_endate is now stored
+			// query old recurrence information, before updating main table, where recur_endate is now stored
 			if (!empty($event['recur_type']))
 			{
 				$old_repeats = $this->db->select($this->repeats_table, "$this->repeats_table.*,range_end AS recur_enddate",
@@ -1610,7 +1620,7 @@ ORDER BY cal_user_type, cal_usre_id
 			}
 
 			$event['recur_exception'] = is_array($event['recur_exception']) ? $event['recur_exception'] : array();
-			if (!empty($event['recur_exception']))
+			if (count($event['recur_exception']) > 1)
 			{
 				sort($event['recur_exception']);
 			}
@@ -1707,7 +1717,7 @@ ORDER BY cal_user_type, cal_usre_id
 				// truncate recurrences by given exceptions
 				if (count($event['recur_exception']))
 				{
-					// added and existing exceptions: delete the execeptions from the user table, it could be the first time
+					// added and existing exceptions: delete the exceptions from the user table, it could be the first time
 					$this->db->delete($this->user_table,array('cal_id' => $cal_id,'cal_recur_date' => $event['recur_exception']),__LINE__,__FILE__,'calendar');
 					// update recur_exception flag based on current exceptions
 					$this->db->update($this->dates_table, 'recur_exception='.$this->db->expression($this->dates_table,array(

calendar/inc/class.calendar_timezones.inc.php

@@ -113,6 +113,11 @@ class calendar_timezones
 				self::$tz_cache[$id] = Api\Db::strip_array_keys($data,'tz_');
 			}
 		}
+		// check for a Windows timezone without "Standard Time" postfix
+		if (!isset($id) && strpos($tzid, '/') === false)
+		{
+			$id = self::tz2id($tzid.' Standard Time');
+		}
 		if (isset($id) && $what != 'id')
 		{
 			return self::id2tz($id,$what);