<?php
/*
* Modified for slx-admin to support streaming, some functions removed that are not needed,
* Carbon removed, Honor window size when calculating recurring events, ...
*/
/**
* This PHP class will read an ICS (`.ics`, `.ical`, `.ifb`) file, parse it and return an
* array of its contents.
*
* PHP 5 (≥ 5.3.9)
*
* @author Jonathan Goode <https://github.com/u01jmg3>
* @license https://opensource.org/licenses/mit-license.php MIT License
* @version 2.1.20
*/
class ICalParser
{
// phpcs:disable Generic.Arrays.DisallowLongArraySyntax
const DATE_TIME_FORMAT = 'Ymd\THis';
const ICAL_DATE_TIME_TEMPLATE = 'TZID=%s:';
const ISO_8601_WEEK_START = 'MO';
const RECURRENCE_EVENT = 'Generated recurrence event';
const TIME_ZONE_UTC = 'UTC';
const UNIX_FORMAT = 'U';
/**
* Tracks the number of alarms in the current iCal feed
*
* @var integer
*/
public $alarmCount = 0;
/**
* Tracks the number of events in the current iCal feed
*
* @var integer
*/
public $eventCount = 0;
/**
* Tracks the free/busy count in the current iCal feed
*
* @var integer
*/
public $freeBusyCount = 0;
/**
* Tracks the number of todos in the current iCal feed
*
* @var integer
*/
public $todoCount = 0;
/**
* The value in years to use for indefinite, recurring events
*
* @var integer
*/
public $defaultSpan = 2;
/**
* Enables customisation of the default time zone
*
* @var string
*/
public $defaultTimeZone;
/**
* The two letter representation of the first day of the week
*
* @var string
*/
public $defaultWeekStart = self::ISO_8601_WEEK_START;
/**
* Toggles whether to skip the parsing of recurrence rules
*
* @var boolean
*/
public $skipRecurrence = false;
/**
* With this being non-null the parser will ignore all events more than roughly this many days after now.
*
* @var integer
*/
public $filterDaysBefore;
/**
* With this being non-null the parser will ignore all events more than roughly this many days before now.
*
* @var integer
*/
public $filterDaysAfter;
/**
* @var string Which object type we're currently handling while parsing.
*/
private $parseStateComponent = '';
/**
* @var string Current line being read (in case of continuation).
*/
private $currentLineBuffer = '';
/**
* @var string Chunk of data currently being handled - might stop mid-line.
*/
private $feedBuffer = '';
/**
* @var bool whether we ever saw a BEGIN:VCALENDAR in the data
*/
private $hasSeenStart = false;
/**
* The parsed calendar
*
* @var array
*/
public $cal = array();
/**
* Tracks the VFREEBUSY component
*
* @var integer
*/
protected $freeBusyIndex = 0;
/**
* Variable to track the previous keyword
*
* @var string
*/
protected $lastKeyword;
/**
* Cache valid IANA time zone IDs to avoid unnecessary lookups
*
* @var array
*/
protected $validIanaTimeZones = array();
/**
* Event recurrence instances that have been altered
*
* @var array
*/
protected $alteredRecurrenceInstances = array();
/**
* An associative array containing weekday conversion data
*
* The order of the days in the array follow the ISO-8601 specification of a week.
*
* @var array
*/
protected $weekdays = array(
'MO' => 'monday',
'TU' => 'tuesday',
'WE' => 'wednesday',
'TH' => 'thursday',
'FR' => 'friday',
'SA' => 'saturday',
'SU' => 'sunday',
);
/**
* An associative array containing frequency conversion terms
*
* @var array
*/
protected $frequencyConversion = array(
'DAILY' => 'day',
'WEEKLY' => 'week',
'MONTHLY' => 'month',
'YEARLY' => 'year',
);
/**
* Define which variables can be configured
*
* @var array
*/
private static $configurableOptions = array(
'defaultSpan',
'defaultTimeZone',
'defaultWeekStart',
'filterDaysAfter',
'filterDaysBefore',
'skipRecurrence',
);
/**
* CLDR time zones mapped to IANA time zones.
*
* @var array
*/
private static $cldrTimeZonesMap = array(
'(UTC-12:00) International Date Line West' => 'Etc/GMT+12',
'(UTC-11:00) Coordinated Universal Time-11' => 'Etc/GMT+11',
'(UTC-10:00) Hawaii' => 'Pacific/Honolulu',
'(UTC-09:00) Alaska' => 'America/Anchorage',
'(UTC-08:00) Pacific Time (US & Canada)' => 'America/Los_Angeles',
'(UTC-07:00) Arizona' => 'America/Phoenix',
'(UTC-07:00) Chihuahua, La Paz, Mazatlan' => 'America/Chihuahua',
'(UTC-07:00) Mountain Time (US & Canada)' => 'America/Denver',
'(UTC-06:00) Central America' => 'America/Guatemala',
'(UTC-06:00) Central Time (US & Canada)' => 'America/Chicago',
'(UTC-06:00) Guadalajara, Mexico City, Monterrey' => 'America/Mexico_City',
'(UTC-06:00) Saskatchewan' => 'America/Regina',
'(UTC-05:00) Bogota, Lima, Quito, Rio Branco' => 'America/Bogota',
'(UTC-05:00) Chetumal' => 'America/Cancun',
'(UTC-05:00) Eastern Time (US & Canada)' => 'America/New_York',
'(UTC-05:00) Indiana (East)' => 'America/Indianapolis',
'(UTC-04:00) Asuncion' => 'America/Asuncion',
'(UTC-04:00) Atlantic Time (Canada)' => 'America/Halifax',
'(UTC-04:00) Caracas' => 'America/Caracas',
'(UTC-04:00) Cuiaba' => 'America/Cuiaba',
'(UTC-04:00) Georgetown, La Paz, Manaus, San Juan' => 'America/La_Paz',
'(UTC-04:00) Santiago' => 'America/Santiago',
'(UTC-03:30) Newfoundland' => 'America/St_Johns',
'(UTC-03:00) Brasilia' => 'America/Sao_Paulo',
'(UTC-03:00) Cayenne, Fortaleza' => 'America/Cayenne',
'(UTC-03:00) City of Buenos Aires' => 'America/Buenos_Aires',
'(UTC-03:00) Greenland' => 'America/Godthab',
'(UTC-03:00) Montevideo' => 'America/Montevideo',
'(UTC-03:00) Salvador' => 'America/Bahia',
'(UTC-02:00) Coordinated Universal Time-02' => 'Etc/GMT+2',
'(UTC-01:00) Azores' => 'Atlantic/Azores',
'(UTC-01:00) Cabo Verde Is.' => 'Atlantic/Cape_Verde',
'(UTC) Coordinated Universal Time' => 'Etc/GMT',
'(UTC+00:00) Casablanca' => 'Africa/Casablanca',
'(UTC+00:00) Dublin, Edinburgh, Lisbon, London' => 'Europe/London',
'(UTC+00:00) Monrovia, Reykjavik' => 'Atlantic/Reykjavik',
'(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna' => 'Europe/Berlin',
'(UTC+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague' => 'Europe/Budapest',
'(UTC+01:00) Brussels, Copenhagen, Madrid, Paris' => 'Europe/Paris',
'(UTC+01:00) Sarajevo, Skopje, Warsaw, Zagreb' => 'Europe/Warsaw',
'(UTC+01:00) West Central Africa' => 'Africa/Lagos',
'(UTC+02:00) Amman' => 'Asia/Amman',
'(UTC+02:00) Athens, Bucharest' => 'Europe/Bucharest',
'(UTC+02:00) Beirut' => 'Asia/Beirut',
'(UTC+02:00) Cairo' => 'Africa/Cairo',
'(UTC+02:00) Chisinau' => 'Europe/Chisinau',
'(UTC+02:00) Damascus' => 'Asia/Damascus',
'(UTC+02:00) Harare, Pretoria' => 'Africa/Johannesburg',
'(UTC+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius' => 'Europe/Kiev',
'(UTC+02:00) Jerusalem' => 'Asia/Jerusalem',
'(UTC+02:00) Kaliningrad' => 'Europe/Kaliningrad',
'(UTC+02:00) Tripoli' => 'Africa/Tripoli',
'(UTC+02:00) Windhoek' => 'Africa/Windhoek',
'(UTC+03:00) Baghdad' => 'Asia/Baghdad',
'(UTC+03:00) Istanbul' => 'Europe/Istanbul',
'(UTC+03:00) Kuwait, Riyadh' => 'Asia/Riyadh',
'(UTC+03:00) Minsk' => 'Europe/Minsk',
'(UTC+03:00) Moscow, St. Petersburg, Volgograd' => 'Europe/Moscow',
'(UTC+03:00) Nairobi' => 'Africa/Nairobi',
'(UTC+03:30) Tehran' => 'Asia/Tehran',
'(UTC+04:00) Abu Dhabi, Muscat' => 'Asia/Dubai',
'(UTC+04:00) Baku' => 'Asia/Baku',
'(UTC+04:00) Izhevsk, Samara' => 'Europe/Samara',
'(UTC+04:00) Port Louis' => 'Indian/Mauritius',
'(UTC+04:00) Tbilisi' => 'Asia/Tbilisi',
'(UTC+04:00) Yerevan' => 'Asia/Yerevan',
'(UTC+04:30) Kabul' => 'Asia/Kabul',
'(UTC+05:00) Ashgabat, Tashkent' => 'Asia/Tashkent',
'(UTC+05:00) Ekaterinburg' => 'Asia/Yekaterinburg',
'(UTC+05:00) Islamabad, Karachi' => 'Asia/Karachi',
'(UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi' => 'Asia/Calcutta',
'(UTC+05:30) Sri Jayawardenepura' => 'Asia/Colombo',
'(UTC+05:45) Kathmandu' => 'Asia/Katmandu',
'(UTC+06:00) Astana' => 'Asia/Almaty',
'(UTC+06:00) Dhaka' => 'Asia/Dhaka',
'(UTC+06:30) Yangon (Rangoon)' => 'Asia/Rangoon',
'(UTC+07:00) Bangkok, Hanoi, Jakarta' => 'Asia/Bangkok',
'(UTC+07:00) Krasnoyarsk' => 'Asia/Krasnoyarsk',
'(UTC+07:00) Novosibirsk' => 'Asia/Novosibirsk',
'(UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi' => 'Asia/Shanghai',
'(UTC+08:00) Irkutsk' => 'Asia/Irkutsk',
'(UTC+08:00) Kuala Lumpur, Singapore' => 'Asia/Singapore',
'(UTC+08:00) Perth' => 'Australia/Perth',
'(UTC+08:00) Taipei' => 'Asia/Taipei',
'(UTC+08:00) Ulaanbaatar' => 'Asia/Ulaanbaatar',
'(UTC+09:00) Osaka, Sapporo, Tokyo' => 'Asia/Tokyo',
'(UTC+09:00) Pyongyang' => 'Asia/Pyongyang',
'(UTC+09:00) Seoul' => 'Asia/Seoul',
'(UTC+09:00) Yakutsk' => 'Asia/Yakutsk',
'(UTC+09:30) Adelaide' => 'Australia/Adelaide',
'(UTC+09:30) Darwin' => 'Australia/Darwin',
'(UTC+10:00) Brisbane' => 'Australia/Brisbane',
'(UTC+10:00) Canberra, Melbourne, Sydney' => 'Australia/Sydney',
'(UTC+10:00) Guam, Port Moresby' => 'Pacific/Port_Moresby',
'(UTC+10:00) Hobart' => 'Australia/Hobart',
'(UTC+10:00) Vladivostok' => 'Asia/Vladivostok',
'(UTC+11:00) Chokurdakh' => 'Asia/Srednekolymsk',
'(UTC+11:00) Magadan' => 'Asia/Magadan',
'(UTC+11:00) Solomon Is., New Caledonia' => 'Pacific/Guadalcanal',
'(UTC+12:00) Anadyr, Petropavlovsk-Kamchatsky' => 'Asia/Kamchatka',
'(UTC+12:00) Auckland, Wellington' => 'Pacific/Auckland',
'(UTC+12:00) Coordinated Universal Time+12' => 'Etc/GMT-12',
'(UTC+12:00) Fiji' => 'Pacific/Fiji',
"(UTC+13:00) Nuku'alofa" => 'Pacific/Tongatapu',
'(UTC+13:00) Samoa' => 'Pacific/Apia',
'(UTC+14:00) Kiritimati Island' => 'Pacific/Kiritimati',
);
/**
* Maps Windows (non-CLDR) time zone ID to IANA ID. This is pragmatic but not 100% precise as one Windows zone ID
* maps to multiple IANA IDs (one for each territory). For all practical purposes this should be good enough, though.
*
* Source: http://unicode.org/repos/cldr/trunk/common/supplemental/windowsZones.xml
*
* @var array
*/
private static $windowsTimeZonesMap = array(
'AUS Central Standard Time' => 'Australia/Darwin',
'AUS Eastern Standard Time' => 'Australia/Sydney',
'Afghanistan Standard Time' => 'Asia/Kabul',
'Alaskan Standard Time' => 'America/Anchorage',
'Aleutian Standard Time' => 'America/Adak',
'Altai Standard Time' => 'Asia/Barnaul',
'Arab Standard Time' => 'Asia/Riyadh',
'Arabian Standard Time' => 'Asia/Dubai',
'Arabic Standard Time' => 'Asia/Baghdad',
'Argentina Standard Time' => 'America/Buenos_Aires',
'Astrakhan Standard Time' => 'Europe/Astrakhan',
'Atlantic Standard Time' => 'America/Halifax',
'Aus Central W. Standard Time' => 'Australia/Eucla',
'Azerbaijan Standard Time' => 'Asia/Baku',
'Azores Standard Time' => 'Atlantic/Azores',
'Bahia Standard Time' => 'America/Bahia',
'Bangladesh Standard Time' => 'Asia/Dhaka',
'Belarus Standard Time' => 'Europe/Minsk',
'Bougainville Standard Time' => 'Pacific/Bougainville',
'Canada Central Standard Time' => 'America/Regina',
'Cape Verde Standard Time' => 'Atlantic/Cape_Verde',
'Caucasus Standard Time' => 'Asia/Yerevan',
'Cen. Australia Standard Time' => 'Australia/Adelaide',
'Central America Standard Time' => 'America/Guatemala',
'Central Asia Standard Time' => 'Asia/Almaty',
'Central Brazilian Standard Time' => 'America/Cuiaba',
'Central Europe Standard Time' => 'Europe/Budapest',
'Central European Standard Time' => 'Europe/Warsaw',
'Central Pacific Standard Time' => 'Pacific/Guadalcanal',
'Central Standard Time (Mexico)' => 'America/Mexico_City',
'Central Standard Time' => 'America/Chicago',
'Chatham Islands Standard Time' => 'Pacific/Chatham',
'China Standard Time' => 'Asia/Shanghai',
'Cuba Standard Time' => 'America/Havana',
'Dateline Standard Time' => 'Etc/GMT+12',
'E. Africa Standard Time' => 'Africa/Nairobi',
'E. Australia Standard Time' => 'Australia/Brisbane',
'E. Europe Standard Time' => 'Europe/Chisinau',
'E. South America Standard Time' => 'America/Sao_Paulo',
'Easter Island Standard Time' => 'Pacific/Easter',
'Eastern Standard Time (Mexico)' => 'America/Cancun',
'Eastern Standard Time' => 'America/New_York',
'Egypt Standard Time' => 'Africa/Cairo',
'Ekaterinburg Standard Time' => 'Asia/Yekaterinburg',
'FLE Standard Time' => 'Europe/Kiev',
'Fiji Standard Time' => 'Pacific/Fiji',
'GMT Standard Time' => 'Europe/London',
'GTB Standard Time' => 'Europe/Bucharest',
'Georgian Standard Time' => 'Asia/Tbilisi',
'Greenland Standard Time' => 'America/Godthab',
'Greenwich Standard Time' => 'Atlantic/Reykjavik',
'Haiti Standard Time' => 'America/Port-au-Prince',
'Hawaiian Standard Time' => 'Pacific/Honolulu',
'India Standard Time' => 'Asia/Calcutta',
'Iran Standard Time' => 'Asia/Tehran',
'Israel Standard Time' => 'Asia/Jerusalem',
'Jordan Standard Time' => 'Asia/Amman',
'Kaliningrad Standard Time' => 'Europe/Kaliningrad',
'Korea Standard Time' => 'Asia/Seoul',
'Libya Standard Time' => 'Africa/Tripoli',
'Line Islands Standard Time' => 'Pacific/Kiritimati',
'Lord Howe Standard Time' => 'Australia/Lord_Howe',
'Magadan Standard Time' => 'Asia/Magadan',
'Magallanes Standard Time' => 'America/Punta_Arenas',
'Marquesas Standard Time' => 'Pacific/Marquesas',
'Mauritius Standard Time' => 'Indian/Mauritius',
'Middle East Standard Time' => 'Asia/Beirut',
'Montevideo Standard Time' => 'America/Montevideo',
'Morocco Standard Time' => 'Africa/Casablanca',
'Mountain Standard Time (Mexico)' => 'America/Chihuahua',
'Mountain Standard Time' => 'America/Denver',
'Myanmar Standard Time' => 'Asia/Rangoon',
'N. Central Asia Standard Time' => 'Asia/Novosibirsk',
'Namibia Standard Time' => 'Africa/Windhoek',
'Nepal Standard Time' => 'Asia/Katmandu',
'New Zealand Standard Time' => 'Pacific/Auckland',
'Newfoundland Standard Time' => 'America/St_Johns',
'Norfolk Standard Time' => 'Pacific/Norfolk',
'North Asia East Standard Time' => 'Asia/Irkutsk',
'North Asia Standard Time' => 'Asia/Krasnoyarsk',
'North Korea Standard Time' => 'Asia/Pyongyang',
'Omsk Standard Time' => 'Asia/Omsk',
'Pacific SA Standard Time' => 'America/Santiago',
'Pacific Standard Time (Mexico)' => 'America/Tijuana',
'Pacific Standard Time' => 'America/Los_Angeles',
'Pakistan Standard Time' => 'Asia/Karachi',
'Paraguay Standard Time' => 'America/Asuncion',
'Romance Standard Time' => 'Europe/Paris',
'Russia Time Zone 10' => 'Asia/Srednekolymsk',
'Russia Time Zone 11' => 'Asia/Kamchatka',
'Russia Time Zone 3' => 'Europe/Samara',
'Russian Standard Time' => 'Europe/Moscow',
'SA Eastern Standard Time' => 'America/Cayenne',
'SA Pacific Standard Time' => 'America/Bogota',
'SA Western Standard Time' => 'America/La_Paz',
'SE Asia Standard Time' => 'Asia/Bangkok',
'Saint Pierre Standard Time' => 'America/Miquelon',
'Sakhalin Standard Time' => 'Asia/Sakhalin',
'Samoa Standard Time' => 'Pacific/Apia',
'Sao Tome Standard Time' => 'Africa/Sao_Tome',
'Saratov Standard Time' => 'Europe/Saratov',
'Singapore Standard Time' => 'Asia/Singapore',
'South Africa Standard Time' => 'Africa/Johannesburg',
'Sri Lanka Standard Time' => 'Asia/Colombo',
'Sudan Standard Time' => 'Africa/Tripoli',
'Syria Standard Time' => 'Asia/Damascus',
'Taipei Standard Time' => 'Asia/Taipei',
'Tasmania Standard Time' => 'Australia/Hobart',
'Tocantins Standard Time' => 'America/Araguaina',
'Tokyo Standard Time' => 'Asia/Tokyo',
'Tomsk Standard Time' => 'Asia/Tomsk',
'Tonga Standard Time' => 'Pacific/Tongatapu',
'Transbaikal Standard Time' => 'Asia/Chita',
'Turkey Standard Time' => 'Europe/Istanbul',
'Turks And Caicos Standard Time' => 'America/Grand_Turk',
'US Eastern Standard Time' => 'America/Indianapolis',
'US Mountain Standard Time' => 'America/Phoenix',
'UTC' => 'Etc/GMT',
'UTC+12' => 'Etc/GMT-12',
'UTC+13' => 'Etc/GMT-13',
'UTC-02' => 'Etc/GMT+2',
'UTC-08' => 'Etc/GMT+8',
'UTC-09' => 'Etc/GMT+9',
'UTC-11' => 'Etc/GMT+11',
'Ulaanbaatar Standard Time' => 'Asia/Ulaanbaatar',
'Venezuela Standard Time' => 'America/Caracas',
'Vladivostok Standard Time' => 'Asia/Vladivostok',
'W. Australia Standard Time' => 'Australia/Perth',
'W. Central Africa Standard Time' => 'Africa/Lagos',
'W. Europe Standard Time' => 'Europe/Berlin',
'W. Mongolia Standard Time' => 'Asia/Hovd',
'West Asia Standard Time' => 'Asia/Tashkent',
'West Bank Standard Time' => 'Asia/Hebron',
'West Pacific Standard Time' => 'Pacific/Port_Moresby',
'Yakutsk Standard Time' => 'Asia/Yakutsk',
);
/**
* If `$filterDaysBefore` or `$filterDaysAfter` are set then the events are filtered according to the window defined
* by this field and `$windowMaxTimestamp`.
*
* @var integer
*/
private $windowMinTimestamp;
/**
* If `$filterDaysBefore` or `$filterDaysAfter` are set then the events are filtered according to the window defined
* by this field and `$windowMinTimestamp`.
*
* @var integer
*/
private $windowMaxTimestamp;
/**
* `true` if either `$filterDaysBefore` or `$filterDaysAfter` are set.
*
* @var boolean
*/
private $shouldFilterByWindow;
/**
* Creates the ICal object
*
* @param array $options
* @return void
* @throws Exception
*/
public function __construct(array $options = array())
{
foreach ($options as $option => $value) {
if (in_array($option, self::$configurableOptions)) {
$this->{$option} = $value;
}
}
// Fallback to use the system default time zone
if (!isset($this->defaultTimeZone) || !$this->isValidTimeZoneId($this->defaultTimeZone)) {
$this->defaultTimeZone = date_default_timezone_get();
}
$this->windowMinTimestamp = is_null($this->filterDaysBefore) ? PHP_INT_MIN : (new DateTime('now'))->sub(new DateInterval('P' . $this->filterDaysBefore . 'D'))->getTimestamp();
$this->windowMaxTimestamp = is_null($this->filterDaysAfter) ? PHP_INT_MAX : (new DateTime('now'))->add(new DateInterval('P' . $this->filterDaysAfter . 'D'))->getTimestamp();
$this->shouldFilterByWindow = !is_null($this->filterDaysBefore) || !is_null($this->filterDaysAfter);
}
/**
* Feed more data to the parser. This can be a chunk of arbitrary length, it
* is not required to end on a line break.
*
* @param string $data
*/
public function feedData(string $data)
{
$this->feedBuffer .= $data;
$start = 0;
$bufferLen = strlen($this->feedBuffer);
while (($newLine = strcspn($this->feedBuffer, "\r\n", $start) + $start) !== $bufferLen) {
$length = $newLine - $start;
if ($length > 1) {
if ($this->feedBuffer[$start] === ' ' || $this->feedBuffer[$start] === '\t') {
// Continuation of previous line
$this->currentLineBuffer .= substr($this->feedBuffer, $start + 1, $length - 1);
} else {
// New line, flush previous one
$this->handleLine($this->currentLineBuffer);
$this->currentLineBuffer = substr($this->feedBuffer, $start, $length);
}
}
$start = $newLine + 1;
}
$this->feedBuffer = substr($this->feedBuffer, $start);
}
/**
* Finish feeding more data to the parser, process the data.
*/
public function finish()
{
// Flush
$this->feedData("\n*\n");
$this->currentLineBuffer = '';
$this->feedBuffer = '';
$this->processEvents();
if (!$this->skipRecurrence) {
$this->processRecurrences();
// Apply changes to altered recurrence instances
if (!empty($this->alteredRecurrenceInstances)) {
$events = $this->cal['VEVENT'];
foreach ($this->alteredRecurrenceInstances as $alteredRecurrenceInstance) {
if (isset($alteredRecurrenceInstance['altered-event'])) {
$alteredEvent = $alteredRecurrenceInstance['altered-event'];
$key = key($alteredEvent);
$events[$key] = $alteredEvent[$key];
}
}
$this->cal['VEVENT'] = $events;
}
}
if ($this->shouldFilterByWindow) {
$this->reduceEventsToMinMaxRange();
}
$this->processDateConversions();
}
/**
* True if this resembles a calendar, i.e. we've seen the
* BEGIN:VCALENDAR line at some point.
*
* @return bool
*/
public function isValid(): bool
{
return $this->hasSeenStart;
}
/**
* Process next completed line from file
*
* @param string $line
*/
protected function handleLine(string $line)
{
$line = rtrim($line); // Trim trailing whitespace
$line = $this->removeUnprintableChars($line);
if (empty($line)) {
return;
}
$add = $this->keyValueFromString($line);
if ($add === null) {
return;
}
$keyword = $add[0]; // string
$values = $add[1]; // May be an array containing multiple values
if (!is_array($values)) {
if (!empty($values)) {
$values = array($values); // Make an array as not already
$blankArray = array(); // Empty placeholder array
$values[] = $blankArray;
} else {
$values = array(); // Use blank array to ignore this line
}
} elseif (empty($values[0])) {
$values = array(); // Use blank array to ignore this line
}
// Reverse so that our array of properties is processed first
$values = array_reverse($values);
foreach ($values as $value) {
switch ($line) {
// https://www.kanzaki.com/docs/ical/vtodo.html
case 'BEGIN:VTODO':
if (!is_array($value)) {
$this->todoCount++;
}
$this->parseStateComponent = 'VTODO';
break;
// https://www.kanzaki.com/docs/ical/vevent.html
case 'BEGIN:VEVENT':
if (!is_array($value)) {
$this->eventCount++;
}
$this->parseStateComponent = 'VEVENT';
break;
// https://www.kanzaki.com/docs/ical/vfreebusy.html
case 'BEGIN:VFREEBUSY':
if (!is_array($value)) {
$this->freeBusyIndex++;
}
$this->parseStateComponent = 'VFREEBUSY';
break;
case 'BEGIN:VALARM':
if (!is_array($value)) {
$this->alarmCount++;
}
$this->parseStateComponent = 'VALARM';
break;
case 'END:VALARM':
$this->parseStateComponent = 'VEVENT';
break;
case 'BEGIN:DAYLIGHT':
case 'BEGIN:STANDARD':
case 'BEGIN:VTIMEZONE':
$this->parseStateComponent = $value;
break;
case 'END:DAYLIGHT':
case 'END:STANDARD':
case 'END:VFREEBUSY':
case 'END:VTIMEZONE':
case 'END:VTODO':
$this->parseStateComponent = 'VCALENDAR';
break;
case 'BEGIN:VCALENDAR':
$this->hasSeenStart = true;
$this->parseStateComponent = $value;
break;
case 'END:VCALENDAR':
$this->parseStateComponent = '';
break;
case 'END:VEVENT':
if ($this->shouldFilterByWindow) {
$this->removeLastEventIfOutsideWindowAndNonRecurring();
}
$this->parseStateComponent = 'VCALENDAR';
break;
default:
if (!empty($this->parseStateComponent)) {
$this->addCalendarComponentWithKeyAndValue($this->parseStateComponent, $keyword, $value);
}
break;
}
}
}
/**
* Removes the last event (i.e. most recently parsed) if its start date is outside the window spanned by
* `$windowMinTimestamp` / `$windowMaxTimestamp`.
*
* @return void
*/
protected function removeLastEventIfOutsideWindowAndNonRecurring()
{
$events = $this->cal['VEVENT'];
if (!empty($events)) {
$lastIndex = count($events) - 1;
$lastEvent = $events[$lastIndex];
if (empty($lastEvent['RRULE']) && $this->doesEventStartOutsideWindow($lastEvent)) {
$this->eventCount--;
unset($events[$lastIndex]);
}
$this->cal['VEVENT'] = $events;
}
}
/**
* Reduces the number of events to the defined minimum and maximum range
*
* @return void
*/
protected function reduceEventsToMinMaxRange()
{
$events = (isset($this->cal['VEVENT'])) ? $this->cal['VEVENT'] : array();
if (!empty($events)) {
foreach ($events as $key => $anEvent) {
if ($anEvent === null) {
unset($events[$key]);
} elseif ($this->doesEventStartOutsideWindow($anEvent)) {
$this->eventCount--;
unset($events[$key]);
}
}
$this->cal['VEVENT'] = $events;
}
}
/**
* Determines whether the event start date is outside `$windowMinTimestamp` / `$windowMaxTimestamp`.
* Returns `true` for invalid dates.
*
* @param array $event
* @return boolean
*/
protected function doesEventStartOutsideWindow(array $event): bool
{
return !isset($event['DTSTART']) || !$this->isValidDate($event['DTSTART'])
|| $this->isOutOfRange($event['DTSTART'], $this->windowMinTimestamp, $this->windowMaxTimestamp);
}
/**
* Determines whether a valid iCalendar date is within a given range
*
* @param string $calendarDate
* @param integer $minTimestamp
* @param integer $maxTimestamp
* @return boolean
*/
protected function isOutOfRange(string $calendarDate, int $minTimestamp, int $maxTimestamp): bool
{
$timestamp = strtotime(explode('T', $calendarDate)[0]);
return $timestamp < $minTimestamp || $timestamp > $maxTimestamp;
}
/**
* Add one key and value pair to the `$this->cal` array
*
* @param string $component
* @param string $keyword
* @param string|string[] $value
* @return void
*/
protected function addCalendarComponentWithKeyAndValue(string $component, string $keyword, $value)
{
switch ($component) {
case 'VALARM':
$key1 = 'VEVENT';
$key2 = ($this->eventCount - 1);
$key3 = $component;
if (!isset($this->cal[$key1][$key2][$key3]["{$keyword}_array"])) {
$this->cal[$key1][$key2][$key3]["{$keyword}_array"] = array();
}
if (is_array($value)) {
// Add array of properties to the end
$this->cal[$key1][$key2][$key3]["{$keyword}_array"][] = $value;
} else {
if (!isset($this->cal[$key1][$key2][$key3][$keyword])) {
$this->cal[$key1][$key2][$key3][$keyword] = $value;
}
if ($this->cal[$key1][$key2][$key3][$keyword] !== $value) {
$this->cal[$key1][$key2][$key3][$keyword] .= ',' . $value;
}
}
break;
case 'VEVENT':
$key1 = $component;
$key2 = ($this->eventCount - 1);
if (!isset($this->cal[$key1][$key2]["{$keyword}_array"])) {
$this->cal[$key1][$key2]["{$keyword}_array"] = array();
}
if (is_array($value)) {
// Add array of properties to the end
$this->cal[$key1][$key2]["{$keyword}_array"][] = $value;
} else {
if (!isset($this->cal[$key1][$key2][$keyword])) {
$this->cal[$key1][$key2][$keyword] = $value;
}
if ($keyword === 'EXDATE') {
if (trim($value) === $value) {
$array = array_filter(explode(',', $value));
$this->cal[$key1][$key2]["{$keyword}_array"][] = $array;
} else {
$value = explode(',', implode(',', $this->cal[$key1][$key2]["{$keyword}_array"][1]) . trim($value));
$this->cal[$key1][$key2]["{$keyword}_array"][1] = $value;
}
} else {
$this->cal[$key1][$key2]["{$keyword}_array"][] = $value;
if ($keyword === 'DURATION') {
try {
$duration = new DateInterval($value);
$this->cal[$key1][$key2]["{$keyword}_array"][] = $duration;
} catch (Exception $e) {
error_log('Ignoring invalid duration ' . $value);
}
}
}
if ($this->cal[$key1][$key2][$keyword] !== $value) {
$this->cal[$key1][$key2][$keyword] .= ',' . $value;
}
}
break;
case 'VFREEBUSY':
$key1 = $component;
$key2 = ($this->freeBusyIndex - 1);
$key3 = $keyword;
if ($keyword === 'FREEBUSY') {
if (is_array($value)) {
$this->cal[$key1][$key2][$key3][][] = $value;
} else {
$this->freeBusyCount++;
end($this->cal[$key1][$key2][$key3]);
$key = key($this->cal[$key1][$key2][$key3]);
$value = explode('/', $value);
$this->cal[$key1][$key2][$key3][$key][] = $value;
}
} else {
$this->cal[$key1][$key2][$key3][] = $value;
}
break;
case 'VTODO':
$this->cal[$component][$this->todoCount - 1][$keyword] = $value;
break;
default:
$this->cal[$component][$keyword] = $value;
break;
}
// Remove?
$this->lastKeyword = $keyword;
}
/**
* Gets the key value pair from an iCal string
*
* @param string $text
* @return ?array
*/
protected function keyValueFromString(string $text): ?array
{
$text = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8');
$colon = strpos($text, ':');
$quote = strpos($text, '"');
if ($colon === false) {
$matches = array();
} elseif ($quote === false || $colon < $quote) {
list($before, $after) = explode(':', $text, 2);
$matches = array($text, $before, $after);
} else {
list($before, $text) = explode('"', $text, 2);
$text = '"' . $text;
$matches = str_getcsv($text, ':');
$combinedValue = '';
foreach (array_keys($matches) as $key) {
if ($key === 0) {
if (!empty($before)) {
$matches[$key] = $before . '"' . $matches[$key] . '"';
}
} else {
if ($key > 1) {
$combinedValue .= ':';
}
$combinedValue .= $matches[$key];
}
}
$matches = array_slice($matches, 0, 2);
$matches[1] = $combinedValue;
array_unshift($matches, $before . $text);
}
if (count($matches) === 0) {
return null;
}
if (preg_match('/^([A-Z-]+)(;[\w\W]*)?$/', $matches[1])) {
$matches = array_splice($matches, 1, 2); // Remove first match and re-align ordering
// Process properties
if (preg_match('/([A-Z-]+);([\w\W]*)/', $matches[0], $properties)) {
// Remove first match
array_shift($properties);
// Fix to ignore everything in keyword after a ; (e.g. Language, TZID, etc.)
$matches[0] = $properties[0];
array_shift($properties); // Repeat removing first match
$formatted = array();
foreach ($properties as $property) {
// Match semicolon separator outside of quoted substrings
preg_match_all('~[^' . PHP_EOL . '";]+(?:"[^"\\\]*(?:\\\.[^"\\\]*)*"[^' . PHP_EOL . '";]*)*~', $property, $attributes);
// Remove multi-dimensional array and use the first key
$attributes = (count($attributes) === 0) ? array($property) : reset($attributes);
if (is_array($attributes)) {
foreach ($attributes as $attribute) {
// Match equals sign separator outside of quoted substrings
preg_match_all(
'~[^' . PHP_EOL . '"=]+(?:"[^"\\\]*(?:\\\.[^"\\\]*)*"[^' . PHP_EOL . '"=]*)*~',
$attribute,
$values
);
// Remove multi-dimensional array and use the first key
$value = (count($values) === 0) ? null : reset($values);
if (is_array($value) && isset($value[1])) {
// Remove double quotes from beginning and end only
$formatted[$value[0]] = trim($value[1], '"');
}
}
}
}
// Assign the keyword property information
$properties[0] = $formatted;
// Add match to beginning of array
array_unshift($properties, $matches[1]);
$matches[1] = $properties;
}
return $matches;
}
return null; // Ignore this match
}
/**
* Returns a `DateTime` object from an iCal date time format
*
* @param string $icalDate
* @return DateTime
*/
public function iCalDateToDateTime(string $icalDate): DateTime
{
/**
* iCal times may be in 3 formats, (https://www.kanzaki.com/docs/ical/dateTime.html)
*
* UTC: Has a trailing 'Z'
* Floating: No time zone reference specified, no trailing 'Z', use local time
* TZID: Set time zone as specified
*
* Use DateTime class objects to get around limitations with `mktime` and `gmmktime`.
* Must have a local time zone set to process floating times.
*/
$pattern = '/^(?:TZID=)?([^:]*|".*")'; // [1]: Time zone
$pattern .= ':?'; // Time zone delimiter
$pattern .= '([0-9]{8})'; // [2]: YYYYMMDD
$pattern .= 'T?'; // Time delimiter
$pattern .= '(?(?<=T)([0-9]{6}))'; // [3]: HHMMSS (filled if delimiter present)
$pattern .= '(Z?)/'; // [4]: UTC flag
preg_match($pattern, $icalDate, $date);
if (empty($date)) {
error_log('Invalid iCal date format: ' . $icalDate);
return new Datetime('1970-08-08'); // Return something far in the past
}
// A Unix timestamp usually cannot represent a date prior to 1 Jan 1970.
// PHP, on the other hand, uses negative numbers for that. Thus we don't
// need to special case them.
if ($date[4] === 'Z') {
$dateTimeZone = new DateTimeZone(self::TIME_ZONE_UTC);
} elseif (!empty($date[1])) {
$dateTimeZone = $this->timeZoneStringToDateTimeZone($date[1]);
} else {
$dateTimeZone = new DateTimeZone($this->defaultTimeZone);
}
// The exclamation mark at the start of the format string indicates that if a
// time portion is not included, the time in the returned DateTime should be
// set to 00:00:00. Without it, the time would be set to the current system time.
$dateFormat = '!Ymd';
$dateBasic = $date[2];
if (!empty($date[3])) {
$dateBasic .= "T{$date[3]}";
$dateFormat .= '\THis';
}
return DateTime::createFromFormat($dateFormat, $dateBasic, $dateTimeZone);
}
/**
* Returns a Unix timestamp from an iCal date time format
*
* @param string $icalDate
* @return integer
*/
public function iCalDateToUnixTimestamp(string $icalDate): int
{
return $this->iCalDateToDateTime($icalDate)->getTimestamp();
}
/**
* Returns a date adapted to the calendar time zone depending on the event `TZID`
*
* @param array $event
* @param string $key
* @param string $format
* @return string|boolean
*/
public function iCalDateWithTimeZone(array $event, string $key, string $format = self::DATE_TIME_FORMAT)
{
if (!isset($event["{$key}_array"]) || !isset($event[$key])) {
return false;
}
$dateArray = $event["{$key}_array"];
if ($key === 'DURATION') {
$dateTime = $this->parseDuration($event['DTSTART'], $dateArray[2], null);
} else {
// When constructing from a Unix Timestamp, no time zone needs passing.
$dateTime = new DateTime("@{$dateArray[2]}");
}
// Set the time zone we wish to use when running `$dateTime->format`.
$dateTime->setTimezone(new DateTimeZone($this->calendarTimeZone()));
if (is_null($format)) {
return $dateTime;
}
return $dateTime->format($format);
}
/**
* Performs admin tasks on all events as read from the iCal file.
* Adds a Unix timestamp to all `{DTSTART|DTEND|RECURRENCE-ID}_array` arrays
* Tracks modified recurrence instances
*
* @return void
*/
protected function processEvents()
{
if (empty($this->cal['VEVENT']))
return;
$events =& $this->cal['VEVENT'];
foreach ($events as $key => $anEvent) {
foreach (array('DTSTART', 'DTEND', 'RECURRENCE-ID') as $type) {
if (isset($anEvent[$type])) {
$date = $anEvent["{$type}_array"][1];
if (isset($anEvent["{$type}_array"][0]['TZID'])) {
$timeZone = $this->escapeParamText($anEvent["{$type}_array"][0]['TZID']);
$date = sprintf(self::ICAL_DATE_TIME_TEMPLATE, $timeZone) . $date;
}
$anEvent["{$type}_array"][2] = $this->iCalDateToUnixTimestamp($date);
$anEvent["{$type}_array"][3] = $date;
}
}
if (isset($anEvent['RECURRENCE-ID'])) {
$uid = $anEvent['UID'];
if (!isset($this->alteredRecurrenceInstances[$uid])) {
$this->alteredRecurrenceInstances[$uid] = array();
}
$recurrenceDateUtc = $this->iCalDateToUnixTimestamp($anEvent['RECURRENCE-ID_array'][3]);
$this->alteredRecurrenceInstances[$uid][$key] = $recurrenceDateUtc;
}
$events[$key] = $anEvent;
}
$eventKeysToRemove = array();
foreach ($events as $key => $event) {
$checks = !isset($event['RECURRENCE-ID'])
&& isset($event['UID']) && isset($this->alteredRecurrenceInstances[$event['UID']]);
if ($checks) {
$eventDtstartUnix = $this->iCalDateToUnixTimestamp($event['DTSTART_array'][3]);
// phpcs:ignore CustomPHPCS.ControlStructures.AssignmentInCondition
if (($alteredEventKey = array_search($eventDtstartUnix, $this->alteredRecurrenceInstances[$event['UID']])) !== false) {
$eventKeysToRemove[] = $alteredEventKey;
$alteredEvent = array_replace_recursive($event, $events[$alteredEventKey]);
$this->alteredRecurrenceInstances[$event['UID']]['altered-event'] = array($key => $alteredEvent);
}
}
}
foreach ($eventKeysToRemove as $eventKeyToRemove) {
$events[$eventKeyToRemove] = null;
}
}
/**
* Processes recurrence rules
*
* @return void
*/
protected function processRecurrences()
{
// If there are no events, then we have nothing to process.
if (empty($this->cal['VEVENT']))
return;
$events =& $this->cal['VEVENT'];
$allEventRecurrences = array();
$eventKeysToRemove = array();
foreach ($events as $key => $anEvent) {
if (!isset($anEvent['RRULE']) || $anEvent['RRULE'] === '') {
continue;
}
// Tag as generated by a recurrence rule
$anEvent['RRULE_array'][2] = self::RECURRENCE_EVENT;
// Create new initial starting point.
$initialEventDate = $this->icalDateToDateTime($anEvent['DTSTART_array'][3]);
// Separate the RRULE stanzas, and explode the values that are lists.
$rrules = array();
foreach (explode(';', $anEvent['RRULE']) as $s) {
list($k, $v) = explode('=', $s);
if (in_array($k, array('BYSETPOS', 'BYDAY', 'BYMONTHDAY', 'BYMONTH'))) {
$rrules[$k] = explode(',', $v);
} else {
$rrules[$k] = $v;
}
}
// Get frequency
$frequency = $rrules['FREQ'];
// Reject RRULE if BYDAY stanza is invalid:
// > The BYDAY rule part MUST NOT be specified with a numeric value
// > when the FREQ rule part is not set to MONTHLY or YEARLY.
if (isset($rrules['BYDAY']) && !in_array($frequency, array('MONTHLY', 'YEARLY'))) {
$allByDayStanzasValid = array_reduce($rrules['BYDAY'], function ($carry, $weekday) {
return $carry && substr($weekday, -2) === $weekday;
}, true);
if (!$allByDayStanzasValid) {
error_log("ICal::ProcessRecurrences: A \"{$frequency}\" RRULE should not contain BYDAY values with numeric prefixes");
continue;
}
}
// Get Interval
$interval = (empty($rrules['INTERVAL'])) ? 1 : $rrules['INTERVAL'];
// Throw an error if this isn't an integer.
if (!is_int($this->defaultSpan)) {
trigger_error('ICal::defaultSpan: User defined value is not an integer', E_USER_NOTICE);
}
// Compute EXDATEs
$exdates = $this->parseExdates($anEvent);
// Determine if the initial date is also an EXDATE
$initialDateIsExdate = array_reduce($exdates, function ($carry, $exdate) use ($initialEventDate) {
return $carry || $exdate->getTimestamp() === $initialEventDate->getTimestamp();
}, false);
if ($initialDateIsExdate) {
$eventKeysToRemove[] = $key;
}
/**
* Determine at what point we should stop calculating recurrences
* by looking at the UNTIL or COUNT rrule stanza, or, if neither
* if set, using a fallback.
*
* If the initial date is also an EXDATE, it shouldn't be included
* in the count.
*
* Syntax:
* UNTIL={enddate}
* COUNT=<positive integer>
*
* Where:
* enddate = <icalDate> || <icalDateTime>
*/
$count = 1;
$countLimit = (isset($rrules['COUNT'])) ? intval($rrules['COUNT']) : 0;
$until = date_create()->modify("{$this->defaultSpan} years")->setTime(23, 59, 59)->getTimestamp();
if (isset($rrules['UNTIL'])) {
$until = min($until, $this->iCalDateToUnixTimestamp($rrules['UNTIL']));
}
$until = min($until, $this->windowMaxTimestamp);
$eventRecurrences = array();
$frequencyRecurringDateTime = clone $initialEventDate;
while ($frequencyRecurringDateTime->getTimestamp() <= $until) {
$candidateDateTimes = array();
// phpcs:ignore Squiz.ControlStructures.SwitchDeclaration.MissingDefault
switch ($frequency) {
case 'DAILY':
$candidateDateTimes[] = clone $frequencyRecurringDateTime;
break;
case 'WEEKLY':
$initialDayOfWeek = $frequencyRecurringDateTime->format('N');
$matchingDays = array($initialDayOfWeek);
if (!empty($rrules['BYDAY'])) {
// setISODate() below uses the ISO-8601 specification of weeks: start on
// a Monday, end on a Sunday. However, RRULEs (or the caller of the
// parser) may state an alternate WeeKSTart.
$wkstTransition = 7;
if (empty($rrules['WKST'])) {
if ($this->defaultWeekStart !== self::ISO_8601_WEEK_START) {
$wkstTransition = array_search($this->defaultWeekStart, array_keys($this->weekdays));
}
} elseif ($rrules['WKST'] !== self::ISO_8601_WEEK_START) {
$wkstTransition = array_search($rrules['WKST'], array_keys($this->weekdays));
}
$matchingDays = array_map(
function ($weekday) use ($initialDayOfWeek, $wkstTransition, $interval) {
$day = array_search($weekday, array_keys($this->weekdays));
if ($day < $initialDayOfWeek) {
$day += 7;
}
if ($day >= $wkstTransition) {
$day += 7 * ($interval - 1);
}
// Ignoring alternate week starts, $day at this point will have a
// value between 0 and 6. But setISODate() expects a value of 1 to 7.
// Even with alternate week starts, we still need to +1 to set the
// correct weekday.
$day++;
return $day;
},
$rrules['BYDAY']
);
}
sort($matchingDays);
foreach ($matchingDays as $day) {
$clonedDateTime = clone $frequencyRecurringDateTime;
$candidateDateTimes[] = $clonedDateTime->setISODate(
$frequencyRecurringDateTime->format('o'),
$frequencyRecurringDateTime->format('W'),
$day
);
}
break;
case 'MONTHLY':
$matchingDays = array();
if (!empty($rrules['BYMONTHDAY'])) {
$matchingDays = $rrules['BYMONTHDAY'];
} elseif (!empty($rrules['BYDAY'])) {
$matchingDays = $this->getDaysOfMonthMatchingByDayRRule($rrules['BYDAY'], $frequencyRecurringDateTime);
}
if (!empty($rrules['BYSETPOS'])) {
$matchingDays = $this->filterValuesUsingBySetPosRRule($rrules['BYSETPOS'], $matchingDays);
}
foreach ($matchingDays as $day) {
// Skip invalid dates (e.g. 30th February)
if ($day > $frequencyRecurringDateTime->format('t')) {
continue;
}
$clonedDateTime = clone $frequencyRecurringDateTime;
$candidateDateTimes[] = $clonedDateTime->setDate(
$frequencyRecurringDateTime->format('Y'),
$frequencyRecurringDateTime->format('m'),
$day
);
}
break;
case 'YEARLY':
if (!empty($rrules['BYMONTH'])) {
foreach ($rrules['BYMONTH'] as $byMonth) {
$clonedDateTime = clone $frequencyRecurringDateTime;
$bymonthRecurringDatetime = $clonedDateTime->setDate(
$frequencyRecurringDateTime->format('Y'),
$byMonth,
$frequencyRecurringDateTime->format('d')
);
if (!empty($rrules['BYDAY'])) {
// Get all days of the month that match the BYDAY rule.
$matchingDays = $this->getDaysOfMonthMatchingByDayRRule($rrules['BYDAY'], $bymonthRecurringDatetime);
// And add each of them to the list of recurrences
foreach ($matchingDays as $day) {
$clonedDateTime = clone $bymonthRecurringDatetime;
$candidateDateTimes[] = $clonedDateTime->setDate(
$frequencyRecurringDateTime->format('Y'),
$bymonthRecurringDatetime->format('m'),
$day
);
}
} else {
$candidateDateTimes[] = clone $bymonthRecurringDatetime;
}
}
} else {
$candidateDateTimes[] = clone $frequencyRecurringDateTime;
}
break;
}
foreach ($candidateDateTimes as $candidate) {
$timestamp = $candidate->getTimestamp();
if ($timestamp <= $initialEventDate->getTimestamp()) {
continue;
}
if ($timestamp > $until) {
break;
}
// Exclusions
$isExcluded = ($this->shouldFilterByWindow && $timestamp + 160000 < $this->windowMinTimestamp);
if (!$isExcluded) {
$isExcluded = array_filter($exdates, function ($exdate) use ($timestamp) {
return $exdate->getTimestamp() == $timestamp;
});
}
if (!$isExcluded && isset($this->alteredRecurrenceInstances[$anEvent['UID']])) {
if (in_array($timestamp, $this->alteredRecurrenceInstances[$anEvent['UID']])) {
$isExcluded = true;
}
}
if (!$isExcluded) {
$eventRecurrences[] = $candidate;
$this->eventCount++;
}
// Count all evaluated candidates including excluded ones
if (isset($rrules['COUNT'])) {
$count++;
// If RRULE[COUNT] is reached then break
if ($count >= $countLimit) {
break 2;
}
}
}
// Move forwards $interval $frequency.
$monthPreMove = $frequencyRecurringDateTime->format('m');
$frequencyRecurringDateTime->modify("{$interval} {$this->frequencyConversion[$frequency]}");
// As noted in Example #2 on https://www.php.net/manual/en/datetime.modify.php,
// there are some occasions where adding months doesn't give the month you might
// expect. For instance: January 31st + 1 month == March 3rd (March 2nd on a leap
// year.) The following code crudely rectifies this.
if ($frequency === 'MONTHLY') {
$monthDiff = $frequencyRecurringDateTime->format('m') - $monthPreMove;
if (($monthDiff > 0 && $monthDiff > $interval) || ($monthDiff < 0 && $monthDiff > $interval - 12)) {
$frequencyRecurringDateTime->modify('-1 month');
}
}
}
// Determine event length
$eventLength = 0;
if (isset($anEvent['DURATION'])) {
$clonedDateTime = clone $initialEventDate;
$endDate = $clonedDateTime->add($anEvent['DURATION_array'][2]);
$eventLength = $endDate->getTimestamp() - $anEvent['DTSTART_array'][2];
} elseif (isset($anEvent['DTEND_array'])) {
$eventLength = $anEvent['DTEND_array'][2] - $anEvent['DTSTART_array'][2];
}
// Whether or not the initial date was UTC
$initialDateWasUTC = substr($anEvent['DTSTART'], -1) === 'Z';
// Build the param array
$dateParamArray = array();
if (
!$initialDateWasUTC
&& isset($anEvent['DTSTART_array'][0]['TZID'])
&& $this->isValidTimeZoneId($anEvent['DTSTART_array'][0]['TZID'])
) {
$dateParamArray['TZID'] = $anEvent['DTSTART_array'][0]['TZID'];
}
// Populate the `DT{START|END}[_array]`s
$eventRecurrences = array_map(
function ($recurringDatetime) use ($anEvent, $eventLength, $initialDateWasUTC, $dateParamArray) {
$tzidPrefix = (isset($dateParamArray['TZID'])) ? 'TZID=' . $this->escapeParamText($dateParamArray['TZID']) . ':' : '';
foreach (array('DTSTART', 'DTEND') as $dtkey) {
$anEvent[$dtkey] = $recurringDatetime->format(self::DATE_TIME_FORMAT) . (($initialDateWasUTC) ? 'Z' : '');
$anEvent["{$dtkey}_array"] = array(
$dateParamArray, // [0] Array of params (incl. TZID)
$anEvent[$dtkey], // [1] ICalDateTime string w/o TZID
$recurringDatetime->getTimestamp(), // [2] Unix Timestamp
"{$tzidPrefix}{$anEvent[$dtkey]}", // [3] Full ICalDateTime string
);
if ($dtkey !== 'DTEND') {
$recurringDatetime->modify("{$eventLength} seconds");
}
}
return $anEvent;
},
$eventRecurrences
);
$allEventRecurrences = array_merge($allEventRecurrences, $eventRecurrences);
}
// Nullify the initial events that are also EXDATEs
foreach ($eventKeysToRemove as $eventKeyToRemove) {
$events[$eventKeyToRemove] = null;
}
$events = array_merge($events, $allEventRecurrences);
}
/**
* Find all days of a month that match the BYDAY stanza of an RRULE.
*
* With no {ordwk}, then return the day number of every {weekday}
* within the month.
*
* With a +ve {ordwk}, then return the {ordwk} {weekday} within the
* month.
*
* With a -ve {ordwk}, then return the {ordwk}-to-last {weekday}
* within the month.
*
* RRule Syntax:
* BYDAY={bywdaylist}
*
* Where:
* bywdaylist = {weekdaynum}[,{weekdaynum}...]
* weekdaynum = [[+]{ordwk} || -{ordwk}]{weekday}
* ordwk = 1 to 53
* weekday = SU || MO || TU || WE || TH || FR || SA
*
* @param array $byDays
* @param DateTime $initialDateTime
* @return array
*/
protected function getDaysOfMonthMatchingByDayRRule(array $byDays, DateTime $initialDateTime): array
{
$matchingDays = array();
foreach ($byDays as $weekday) {
$bydayDateTime = clone $initialDateTime;
$ordwk = intval(substr($weekday, 0, -2));
// Quantise the date to the first instance of the requested day in a month
// (Or last if we have a -ve {ordwk})
$bydayDateTime->modify(
(($ordwk < 0) ? 'Last' : 'First')
. ' '
. $this->weekdays[substr($weekday, -2)] // e.g. "Monday"
. ' of ' . $initialDateTime->format('F') // e.g. "June"
);
if ($ordwk < 0) { // -ve {ordwk}
$bydayDateTime->modify((++$ordwk) . ' week');
$matchingDays[] = $bydayDateTime->format('j');
} elseif ($ordwk > 0) { // +ve {ordwk}
$bydayDateTime->modify((--$ordwk) . ' week');
$matchingDays[] = $bydayDateTime->format('j');
} else { // No {ordwk}
while ($bydayDateTime->format('n') === $initialDateTime->format('n')) {
$matchingDays[] = $bydayDateTime->format('j');
$bydayDateTime->modify('+1 week');
}
}
}
// Sort into ascending order.
sort($matchingDays);
return $matchingDays;
}
/**
* Filters a provided values-list by applying a BYSETPOS RRule.
*
* Where a +ve {daynum} is provided, the {ordday} position'd value as
* measured from the start of the list of values should be retained.
*
* Where a -ve {daynum} is provided, the {ordday} position'd value as
* measured from the end of the list of values should be retained.
*
* RRule Syntax:
* BYSETPOS={bysplist}
*
* Where:
* bysplist = {setposday}[,{setposday}...]
* setposday = {daynum}
* daynum = [+ || -] {ordday}
* ordday = 1 to 366
*
* @param array $bySetPos
* @param array $valuesList
* @return array
*/
protected function filterValuesUsingBySetPosRRule(array $bySetPos, array $valuesList): array
{
$filteredMatches = array();
foreach ($bySetPos as $setPosition) {
if ($setPosition < 0) {
$setPosition = count($valuesList) + ++$setPosition;
}
// Positioning starts at 1, array indexes start at 0
if (isset($valuesList[$setPosition - 1])) {
$filteredMatches[] = $valuesList[$setPosition - 1];
}
}
return $filteredMatches;
}
/**
* Processes date conversions using the time zone
*
* Add keys `DTSTART_tz` and `DTEND_tz` to each Event
* These keys contain dates adapted to the calendar
* time zone depending on the event `TZID`.
*
* @return void
*/
protected function processDateConversions()
{
if (empty($this->cal['VEVENT']))
return;
$events =& $this->cal['VEVENT'];
foreach ($events as $key => $anEvent) {
if (is_null($anEvent) || !$this->isValidDate($anEvent['DTSTART'])) {
unset($events[$key]);
$this->eventCount--;
continue;
}
$events[$key]['DTSTART_tz'] = $this->iCalDateWithTimeZone($anEvent, 'DTSTART');
if ($this->iCalDateWithTimeZone($anEvent, 'DTEND')) {
$events[$key]['DTEND_tz'] = $this->iCalDateWithTimeZone($anEvent, 'DTEND');
} elseif ($this->iCalDateWithTimeZone($anEvent, 'DURATION')) {
$events[$key]['DTEND_tz'] = $this->iCalDateWithTimeZone($anEvent, 'DURATION');
} else {
$events[$key]['DTEND_tz'] = $events[$key]['DTSTART_tz'];
}
}
}
/**
* Returns an array of Events.
* Every event is a class with the event
* details being properties within it.
*
* @return ICalEvent[]
*/
public function events(): array
{
if (empty($this->cal) || empty($this->cal['VEVENT']))
return [];
$events = array();
foreach ($this->cal['VEVENT'] as $event) {
$events[] = new ICalEvent($event);
}
return $events;
}
/**
* Returns the calendar name
*
* @return string
*/
public function calendarName(): string
{
return $this->cal['VCALENDAR']['X-WR-CALNAME'] ?? '';
}
/**
* Returns the calendar description
*
* @return string
*/
public function calendarDescription(): string
{
return $this->cal['VCALENDAR']['X-WR-CALDESC'] ?? '';
}
/**
* Returns the calendar time zone
*
* @param boolean $ignoreUtc
* @return string
*/
public function calendarTimeZone(bool $ignoreUtc = false): ?string
{
if (isset($this->cal['VCALENDAR']['X-WR-TIMEZONE'])) {
$timeZone = $this->cal['VCALENDAR']['X-WR-TIMEZONE'];
} elseif (isset($this->cal['VTIMEZONE']['TZID'])) {
$timeZone = $this->cal['VTIMEZONE']['TZID'];
} else {
$timeZone = $this->defaultTimeZone;
}
// Validate the time zone, falling back to the time zone set in the PHP environment.
$timeZone = $this->timeZoneStringToDateTimeZone($timeZone)->getName();
if ($ignoreUtc && strtoupper($timeZone) === self::TIME_ZONE_UTC) {
return null;
}
return $timeZone;
}
/**
* Returns an array of arrays with all free/busy events.
* Every event is an associative array and each property
* is an element it.
*
* @return array
*/
public function freeBusyEvents(): array
{
$array = $this->cal;
return $array['VFREEBUSY'] ?? array();
}
/**
* Returns a sorted array of the events in a given range,
* or an empty array if no events exist in the range.
*
* Events will be returned if the start or end date is contained within the
* range (inclusive), or if the event starts before and end after the range.
*
* If a start date is not specified or of a valid format, then the start
* of the range will default to the current time and date of the server.
*
* If an end date is not specified or of a valid format, then the end of
* the range will default to the current time and date of the server,
* plus 20 years.
*
* Note that this function makes use of Unix timestamps. This might be a
* problem for events on, during, or after 29 Jan 2038.
* See https://en.wikipedia.org/wiki/Unix_time#Representing_the_number
*
* @param string|null $rangeStart
* @param string|null $rangeEnd
* @return array
* @throws Exception
*/
public function eventsFromRange(string $rangeStart = null, string $rangeEnd = null): array
{
// Sort events before processing range
$events = $this->sortEventsWithOrder($this->events());
if (empty($events)) {
return array();
}
$extendedEvents = array();
if (!is_null($rangeStart)) {
try {
$rangeStart = new DateTime($rangeStart, new DateTimeZone($this->defaultTimeZone));
} catch (Exception $exception) {
error_log("ICal::eventsFromRange: Invalid date passed ({$rangeStart})");
$rangeStart = false;
}
} else {
$rangeStart = new DateTime('now', new DateTimeZone($this->defaultTimeZone));
}
if (!is_null($rangeEnd)) {
try {
$rangeEnd = new DateTime($rangeEnd, new DateTimeZone($this->defaultTimeZone));
} catch (Exception $exception) {
error_log("ICal::eventsFromRange: Invalid date passed ({$rangeEnd})");
$rangeEnd = false;
}
} else {
$rangeEnd = new DateTime('now', new DateTimeZone($this->defaultTimeZone));
$rangeEnd->modify('+20 years');
}
// If start and end are identical and are dates with no times...
if ($rangeEnd->format('His') == 0 && $rangeStart->getTimestamp() === $rangeEnd->getTimestamp()) {
$rangeEnd->modify('+1 day');
}
$rangeStart = $rangeStart->getTimestamp();
$rangeEnd = $rangeEnd->getTimestamp();
foreach ($events as $anEvent) {
$eventStart = $anEvent->dtstart_array[2];
$eventEnd = (isset($anEvent->dtend_array[2])) ? $anEvent->dtend_array[2] : null;
if (
($eventStart >= $rangeStart && $eventStart < $rangeEnd) // Event start date contained in the range
|| ($eventEnd !== null
&& (
($eventEnd > $rangeStart && $eventEnd <= $rangeEnd) // Event end date contained in the range
|| ($eventStart < $rangeStart && $eventEnd > $rangeEnd) // Event starts before and finishes after range
)
)
) {
$extendedEvents[] = $anEvent;
}
}
if (empty($extendedEvents)) {
return array();
}
return $extendedEvents;
}
/**
* Sorts events based on a given sort order
*
* @param array $events
* @param integer $sortOrder Either SORT_ASC, SORT_DESC, SORT_REGULAR, SORT_NUMERIC, SORT_STRING
* @return array
*/
public function sortEventsWithOrder(array $events, int $sortOrder = SORT_ASC): array
{
$extendedEvents = array();
$timestamp = array();
foreach ($events as $key => $anEvent) {
$extendedEvents[] = $anEvent;
$timestamp[$key] = $anEvent->dtstart_array[2];
}
array_multisort($timestamp, $sortOrder, $extendedEvents);
return $extendedEvents;
}
/**
* Checks if a time zone is valid (IANA, CLDR, or Windows)
*
* @param string $timeZone
* @return boolean
*/
protected function isValidTimeZoneId(string $timeZone): bool
{
return $this->isValidIanaTimeZoneId($timeZone) !== false
|| $this->isValidCldrTimeZoneId($timeZone) !== false
|| $this->isValidWindowsTimeZoneId($timeZone) !== false;
}
/**
* Checks if a time zone is a valid IANA time zone
*
* @param string $timeZone
* @return boolean
*/
protected function isValidIanaTimeZoneId(string $timeZone): bool
{
if (in_array($timeZone, $this->validIanaTimeZones)) {
return true;
}
$valid = array();
$tza = timezone_abbreviations_list();
foreach ($tza as $zone) {
foreach ($zone as $item) {
$valid[$item['timezone_id']] = true;
}
}
unset($valid['']);
if (isset($valid[$timeZone]) || in_array($timeZone, timezone_identifiers_list(DateTimeZone::ALL_WITH_BC))) {
$this->validIanaTimeZones[] = $timeZone;
return true;
}
return false;
}
/**
* Checks if a time zone is a valid CLDR time zone
*
* @param string $timeZone
* @return boolean
*/
public function isValidCldrTimeZoneId(string $timeZone): bool
{
return array_key_exists(html_entity_decode($timeZone), self::$cldrTimeZonesMap);
}
/**
* Checks if a time zone is a recognised Windows (non-CLDR) time zone
*
* @param string $timeZone
* @return boolean
*/
public function isValidWindowsTimeZoneId(string $timeZone): bool
{
return array_key_exists(html_entity_decode($timeZone), self::$windowsTimeZonesMap);
}
/**
* Parses a duration and applies it to a date
*
* @return integer|DateTime
*/
protected function parseDuration(string $date, DateInterval $duration, ?string $format = self::UNIX_FORMAT)
{
$dateTime = date_create($date);
$dateTime->modify("{$duration->y} year");
$dateTime->modify("{$duration->m} month");
$dateTime->modify("{$duration->d} day");
$dateTime->modify("{$duration->h} hour");
$dateTime->modify("{$duration->i} minute");
$dateTime->modify("{$duration->s} second");
if (is_null($format)) {
$output = $dateTime;
} elseif ($format === self::UNIX_FORMAT) {
$output = $dateTime->getTimestamp();
} else {
$output = $dateTime->format($format);
}
return $output;
}
/**
* Removes unprintable ASCII and UTF-8 characters
*
* @param string $data
* @return string
*/
protected function removeUnprintableChars(string $data): string
{
$data = iconv('utf8', 'utf8//IGNORE', $data);
return preg_replace('/[\x00-\x1F\x7F\xA0]/u', '', $data);
}
/**
* Places double-quotes around texts that have characters not permitted
* in parameter-texts, but are permitted in quoted-texts.
*
* @param string $candidateText
* @return string
*/
protected function escapeParamText(string $candidateText): string
{
if (strpbrk($candidateText, ':;,') !== false) {
return '"' . $candidateText . '"';
}
return $candidateText;
}
/**
* Parses a list of excluded dates
* to be applied to an Event
*
* @param array $event
* @return array
*/
public function parseExdates(array $event): array
{
if (empty($event['EXDATE_array'])) {
return array();
}
$exdates = $event['EXDATE_array'];
$output = array();
$currentTimeZone = $this->defaultTimeZone;
foreach ($exdates as $subArray) {
end($subArray);
$finalKey = key($subArray);
foreach (array_keys($subArray) as $key) {
if ($key === 'TZID') {
$currentTimeZone = $subArray[$key];
} elseif (is_numeric($key)) {
$icalDate = $subArray[$key];
if (substr($icalDate, -1) === 'Z') {
$currentTimeZone = self::TIME_ZONE_UTC;
}
$output[] = new DateTimeImmutable($icalDate, $this->timeZoneStringToDateTimeZone($currentTimeZone));
if ($key === $finalKey) {
// Reset to default
$currentTimeZone = $this->defaultTimeZone;
}
}
}
}
return $output;
}
/**
* Checks if a date string is a valid date
*
* @param string $value
* @return boolean
*/
public function isValidDate(string $value): bool
{
if (!$value) {
return false;
}
try {
new DateTime($value);
return true;
} catch (Exception $exception) {
return false;
}
}
/**
* Returns a `DateTimeZone` object based on a string containing a time zone name.
* Falls back to the default time zone if string passed not a recognised time zone.
*
* @param DateTimeZone|string $timeZoneString
* @return DateTimeZone
*/
public function timeZoneStringToDateTimeZone($timeZoneString): DateTimeZone
{
if ($timeZoneString instanceof DateTimeZone)
return $timeZoneString;
// Some time zones contain characters that are not permitted in param-texts,
// but are within quoted texts. We need to remove the quotes as they're not
// actually part of the time zone.
$timeZoneString = trim($timeZoneString, '"');
$timeZoneString = html_entity_decode($timeZoneString);
if ($this->isValidIanaTimeZoneId($timeZoneString)) {
return new DateTimeZone($timeZoneString);
}
if ($this->isValidCldrTimeZoneId($timeZoneString)) {
return new DateTimeZone(self::$cldrTimeZonesMap[$timeZoneString]);
}
if ($this->isValidWindowsTimeZoneId($timeZoneString)) {
return new DateTimeZone(self::$windowsTimeZonesMap[$timeZoneString]);
}
return new DateTimeZone($this->defaultTimeZone);
}
}
