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<?php /** * This PHP class will read an ICS (`.ics`, `.ical`, `.ifb`) file, parse it and return an * array of its contents. * * PHP 5 (≥ 5.6.40) * * @author Jonathan Goode <https://github.com/u01jmg3> * @license https://opensource.org/licenses/mit-license.php MIT License * @version 3.2.0 * @package CoBlocks / // Exit if accessed directly. if ( ! defined( 'ABSPATH' ) ) { exit; } class CoBlocks_ICal { // phpcs:disable Generic.Arrays.DisallowLongArraySyntax const DATE_TIME_FORMAT = 'Ymd\THis'; const DATE_TIME_FORMAT_PRETTY = 'F Y H:i:s'; const ICAL_DATE_TIME_TEMPLATE = 'TZID=%s:'; const ISO_8601_WEEK_START = 'MO'; const RECURRENCE_EVENT = 'Generated recurrence event'; const SECONDS_IN_A_WEEK = 604800; const TIME_FORMAT = 'His'; const TIME_ZONE_UTC = 'UTC'; const UNIX_FORMAT = 'U'; const UNIX_MIN_YEAR = 1970; /* * 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\|null / 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; /* * Toggles whether to disable all character replacement. * * @var boolean / public $disableCharacterReplacement = false; /* * If this value is an integer, the parser will ignore all events more than roughly this many days before now. * If this value is a date, the parser will ignore all events occurring before this date. * * @var \DateTimeInterface\|integer\|null / public $filterDaysBefore; /* * If this value is an integer, the parser will ignore all events more than roughly this many days after now. * If this value is a date, the parser will ignore all events occurring after this date. * * @var \DateTimeInterface\|integer\|null / public $filterDaysAfter; /* * 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', ); /* * Holds the username and password for HTTP basic authentication * * @var array / protected $httpBasicAuth = array(); /* * Holds the custom User Agent string header * * @var string / protected $httpUserAgent; /* * Holds the custom Accept Language string header * * @var string / protected $httpAcceptLanguage; /* * Holds the custom HTTP Protocol version * * @var string / protected $httpProtocolVersion; /* * Define which variables can be configured * * @var array / private static $configurableOptions = array( 'defaultSpan', 'defaultTimeZone', 'defaultWeekStart', 'disableCharacterReplacement', 'filterDaysAfter', 'filterDaysBefore', 'httpUserAgent', '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 = false; /* * Creates the ICal object * * @param mixed $files * @param array $options * @return void / public function __construct($files = false, array $options = array()) { if (\PHP_VERSION_ID < 80100) { ini_set('auto_detect_line_endings', '1'); } foreach ($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 = $this->getDefaultTimeZone(true); } // Ideally you would use `PHP_INT_MIN` from PHP 7 $php_int_min = -2147483648; $this->windowMinTimestamp = $php_int_min; if (!is_null($this->filterDaysBefore)) { if (is_int($this->filterDaysBefore)) { $this->windowMinTimestamp = (new \DateTime('now')) ->sub(new \DateInterval('P' . $this->filterDaysBefore . 'D')) ->getTimestamp(); } if ($this->filterDaysBefore instanceof \DateTimeInterface) { $this->windowMinTimestamp = $this->filterDaysBefore->getTimestamp(); } } $this->windowMaxTimestamp = PHP_INT_MAX; if (!is_null($this->filterDaysAfter)) { if (is_int($this->filterDaysAfter)) { $this->windowMaxTimestamp = (new \DateTime('now')) ->add(new \DateInterval('P' . $this->filterDaysAfter . 'D')) ->getTimestamp(); } if ($this->filterDaysAfter instanceof \DateTimeInterface) { $this->windowMaxTimestamp = $this->filterDaysAfter->getTimestamp(); } } $this->shouldFilterByWindow = !is_null($this->filterDaysBefore) \|\| !is_null($this->filterDaysAfter); if ($files !== false) { $files = is_array($files) ? $files : array($files); foreach ($files as $file) { if (!is_array($file) && $this->isFileOrUrl($file)) { $lines = $this->fileOrUrl($file); } else { $lines = is_array($file) ? $file : array($file); } $this->initLines($lines); } } } /* * Initialises lines from a string * * @param string $string * @return ICal / public function initString($string) { $string = str_replace(array("\r\n", "\n\r", "\r"), "\n", $string); if ($this->cal === array()) { $lines = explode("\n", $string); $this->initLines($lines); } else { trigger_error('ICal::initString: Calendar already initialised in constructor', E_USER_NOTICE); } return $this; } /* * Initialises lines from a file * * @param string $file * @return ICal / public function initFile($file) { if ($this->cal === array()) { $lines = $this->fileOrUrl($file); $this->initLines($lines); } else { trigger_error('ICal::initFile: Calendar already initialised in constructor', E_USER_NOTICE); } return $this; } /* * Initialises lines from a URL * * @param string $url * @param string $username * @param string $password * @param string $userAgent * @param string $acceptLanguage * @param string $httpProtocolVersion * @return ICal / public function initUrl($url, $username = null, $password = null, $userAgent = null, $acceptLanguage = null, $httpProtocolVersion = null) { if (!is_null($username) && !is_null($password)) { $this->httpBasicAuth['username'] = $username; $this->httpBasicAuth['password'] = $password; } if (!is_null($userAgent)) { $this->httpUserAgent = $userAgent; } if (!is_null($acceptLanguage)) { $this->httpAcceptLanguage = $acceptLanguage; } if (!is_null($httpProtocolVersion)) { $this->httpProtocolVersion = $httpProtocolVersion; } $this->initFile($url); return $this; } /* * Initialises the parser using an array * containing each line of iCal content * * @param array $lines * @return void / protected function initLines(array $lines) { $lines = $this->unfold($lines); if (stristr($lines[0], 'BEGIN:VCALENDAR') !== false) { $component = ''; foreach ($lines as $line) { $line = rtrim($line); // Trim trailing whitespace $line = $this->removeUnprintableChars($line); if (empty($line)) { continue; } if (!$this->disableCharacterReplacement) { $line = str_replace(array( ' ', "\t", "\xc2\xa0", // Non-breaking space ), ' ', $line); $line = $this->cleanCharacters($line); } $add = $this->keyValueFromString($line); $keyword = $add[0]; $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 one 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++; } $component = 'VTODO'; break; case 'BEGIN:VEVENT': // https://www.kanzaki.com/docs/ical/vevent.html if (!is_array($value)) { $this->eventCount++; } $component = 'VEVENT'; break; case 'BEGIN:VFREEBUSY': // https://www.kanzaki.com/docs/ical/vfreebusy.html if (!is_array($value)) { $this->freeBusyIndex++; } $component = 'VFREEBUSY'; break; case 'BEGIN:VALARM': if (!is_array($value)) { $this->alarmCount++; } $component = 'VALARM'; break; case 'END:VALARM': $component = 'VEVENT'; break; case 'BEGIN:DAYLIGHT': case 'BEGIN:STANDARD': case 'BEGIN:VCALENDAR': case 'BEGIN:VTIMEZONE': $component = $value; break; case 'END:DAYLIGHT': case 'END:STANDARD': case 'END:VCALENDAR': case 'END:VFREEBUSY': case 'END:VTIMEZONE': case 'END:VTODO': $component = 'VCALENDAR'; break; case 'END:VEVENT': if ($this->shouldFilterByWindow) { $this->removeLastEventIfOutsideWindowAndNonRecurring(); } $component = 'VCALENDAR'; break; default: $this->addCalendarComponentWithKeyAndValue($component, $keyword, $value); break; } } } $this->processEvents(); if (!$this->skipRecurrence) { $this->processRecurrences(); // Apply changes to altered recurrence instances if ($this->alteredRecurrenceInstances !== array()) { $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(); } $this->processDateConversions(); } } /* * Removes the last event (i.e. most recently parsed) if its start date is outside the window spanned by * `$windowMinTimestamp` / `$windowMaxTimestamp`. * * @return void / protected function removeLastEventIfOutsideWindowAndNonRecurring() { $events = $this->cal['VEVENT']; if ($events !== array()) { $lastIndex = count($events) - 1; $lastEvent = $events[$lastIndex]; if ((!isset($lastEvent['RRULE']) \|\| $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'])) ? $this->cal['VEVENT'] : array(); if ($events !== array()) { foreach ($events as $key => $anEvent) { if ($anEvent === null) { unset($events[$key]); continue; } if ($this->doesEventStartOutsideWindow($anEvent)) { $this->eventCount--; unset($events[$key]); continue; } } $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 $event) { return !$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 $maxTimestamp * @return boolean / protected function isOutOfRange($calendarDate, $minTimestamp, $maxTimestamp) { $timestamp = strtotime(explode('T', $calendarDate)[0]); return $timestamp < $minTimestamp \|\| $timestamp > $maxTimestamp; } /* * Unfolds an iCal file in preparation for parsing * (https://icalendar.org/iCalendar-RFC-5545/3-1-content-lines.html) * * @param array $lines * @return array / protected function unfold(array $lines) { $string = implode(PHP_EOL, $lines); $string = str_ireplace(' ', ' ', $string); $cleanedString = preg_replace('/' . PHP_EOL . '[ \t]/', '', $string); $lines = explode(PHP_EOL, $cleanedString ?: $string); return $lines; } /* * Add one key and value pair to the `$this->cal` array * * @param string $component * @param string\|boolean $keyword * @param string\|array $value * @return void / protected function addCalendarComponentWithKeyAndValue($component, $keyword, $value) { if ($keyword === false) { $keyword = $this->lastKeyword; } switch ($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') { $duration = new \DateInterval($value); $this->cal[$key1][$key2]["{$keyword}_array"][] = $duration; } } if (!is_array($value) && $this->cal[$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] = $value; break; } if (is_string($keyword)) { $this->lastKeyword = $keyword; } } /* * Gets the key value pair from an iCal string * * @param string $text * @return array / public function keyValueFromString($text) { $splitLine = $this->parseLine($text); $object = array(); $paramObj = array(); $valueObj = ''; $i = 0; while ($i < count($splitLine)) { // The first token corresponds to the property name if ($i === 0) { $object[0] = $splitLine[$i]; $i++; continue; } // After each semicolon define the property parameters if ($splitLine[$i] == ';') { $i++; $paramName = $splitLine[$i]; $i += 2; $paramValue = array(); $multiValue = false; // A parameter can have multiple values separated by a comma while ($i + 1 < count($splitLine) && $splitLine[$i + 1] === ',') { $paramValue[] = $splitLine[$i]; $i += 2; $multiValue = true; } if ($multiValue) { $paramValue[] = $splitLine[$i]; } else { $paramValue = $splitLine[$i]; } // Create object with paramName => paramValue $paramObj[$paramName] = $paramValue; } // After a colon all tokens are concatenated (non-standard behaviour because the property can have multiple values // according to RFC5545) if ($splitLine[$i] === ':') { $i++; while ($i < count($splitLine)) { $valueObj .= $splitLine[$i]; $i++; } } $i++; } // Object construction if ($paramObj !== array()) { $object[1][0] = $valueObj; $object[1][1] = $paramObj; } else { $object[1] = $valueObj; } return $object; } /* * Parses a line from an iCal file into an array of tokens * * @param string $line * @return array / protected function parseLine($line) { $words = array(); $word = ''; // The use of str_split is not a problem here even if the character set is in utf8 // Indeed we only compare the characters , ; : = " which are on a single byte $arrayOfChar = str_split($line); $inDoubleQuotes = false; foreach ($arrayOfChar as $char) { // Don't stop the word on ; , : = if it is enclosed in double quotes if ($char === '"') { if ($word !== '') { $words[] = $word; } $word = ''; $inDoubleQuotes = !$inDoubleQuotes; } elseif (!in_array($char, array(';', ':', ',', '=')) \|\| $inDoubleQuotes) { $word .= $char; } else { if ($word !== '') { $words[] = $word; } $words[] = $char; $word = ''; } } $words[] = $word; return $words; } /* * Returns the default time zone if set. * Falls back to the system default if not set. * * @param boolean $forceReturnSystemDefault * @return string / private function getDefaultTimeZone($forceReturnSystemDefault = false) { $systemDefault = date_default_timezone_get(); if ($forceReturnSystemDefault) { return $systemDefault; } return $this->defaultTimeZone ?: $systemDefault; } /* * Returns a `DateTime` object from an iCal date time format * * @param string $icalDate * @return \DateTime\|false * @throws \Exception / public function iCalDateToDateTime($icalDate) { /* * 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, $date); if ($date === array()) { throw new \Exception('Invalid iCal date format.'); } // 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') { $dateTimeZone = new \DateTimeZone(self::TIME_ZONE_UTC); } elseif (isset($date[1]) && $date[1] !== '') { $dateTimeZone = $this->timeZoneStringToDateTimeZone($date[1]); } else { $dateTimeZone = new \DateTimeZone($this->getDefaultTimeZone()); } // 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 = $date[2]; if (isset($date[3]) && $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 $icalDate * @return integer / public function iCalDateToUnixTimestamp($icalDate) { $iCalDateToDateTime = $this->iCalDateToDateTime($icalDate); if ($iCalDateToDateTime === false) { trigger_error("ICal::iCalDateToUnixTimestamp: Invalid date passed ({$icalDate})", E_USER_NOTICE); return 0; } return $iCalDateToDateTime->getTimestamp(); } /* * Returns a date adapted to the calendar time zone depending on the event `TZID` * * @param array $event * @param string $key * @param string\|null $format * @return string\|integer\|boolean\|\DateTime / public function iCalDateWithTimeZone(array $event, $key, $format = self::DATE_TIME_FORMAT) { if (!isset($event["{$key}_array"]) \|\| !isset($event[$key])) { return false; } $dateArray = $event["{$key}_array"]; if ($key === 'DURATION') { $dateTime = $this->parseDuration($event['DTSTART'], $dateArray[2]); if ($dateTime instanceof \DateTime === false) { trigger_error("ICal::iCalDateWithTimeZone: Invalid date passed ({$event['DTSTART']})", E_USER_NOTICE); return false; } } else { // When constructing from a Unix Timestamp, no time zone needs passing. $dateTime = new \DateTime("@{$dateArray[2]}"); } $calendarTimeZone = $this->calendarTimeZone(); if (!is_null($calendarTimeZone)) { // Set the time zone we wish to use when running `$dateTime->format`. $dateTime->setTimezone(new \DateTimeZone($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() { $checks = null; $events = (isset($this->cal['VEVENT'])) ? $this->cal['VEVENT'] : array(); if ($events !== array()) { 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']); $checks[] = isset($event['UID']); $checks[] = isset($event['UID']) && isset($this->alteredRecurrenceInstances[$event['UID']]); if ((bool) array_product($checks)) { $eventDtstartUnix = $this->iCalDateToUnixTimestamp($event['DTSTART_array'][3]); // phpcs:ignore CustomPHPCS.ControlStructures.AssignmentInCondition if (($alteredEventKey = array_search($eventDtstartUnix, $this->alteredRecurrenceInstances[$event['UID']], true)) !== false) { $eventKeysToRemove[] = $alteredEventKey; $alteredEvent = array_replace_recursive($events[$key], $events[$alteredEventKey]); $this->alteredRecurrenceInstances[$event['UID']]['altered-event'] = array($key => $alteredEvent); } } unset($checks); } foreach ($eventKeysToRemove as $eventKeyToRemove) { $events[$eventKeyToRemove] = null; } $this->cal['VEVENT'] = $events; } } /* * Processes recurrence rules * * @return void / protected function processRecurrences() { $events = (isset($this->cal['VEVENT'])) ? $this->cal['VEVENT'] : array(); // If there are no events, then we have nothing to process. if ($events === array()) { return; } $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]); if ($initialEventDate === false) { trigger_error("ICal::processRecurrences: Invalid date passed ({$anEvent['DTSTART_array'][3]})", E_USER_NOTICE); continue; } // Separate the RRULE stanzas, and explode the values that are lists. $rrules = array(); foreach (array_filter(explode(';', $anEvent['RRULE'])) as $s) { list($k, $v) = explode('=', $s); if (in_array($k, array('BYSETPOS', 'BYDAY', 'BYMONTHDAY', 'BYMONTH', 'BYYEARDAY', 'BYWEEKNO'))) { $rrules[$k] = explode(',', $v); } else { $rrules[$k] = $v; } } $frequency = $rrules['FREQ']; if (!is_string($frequency)) { trigger_error('ICal::processRecurrences: Invalid frequency passed', E_USER_NOTICE); continue; } // 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. // > Furthermore, the BYDAY rule part MUST NOT be specified with a // > numeric value with the FREQ rule part set to YEARLY when the // > BYWEEKNO rule part is specified. if (isset($rrules['BYDAY'])) { $checkByDays = function ($carry, $weekday) { return $carry && substr($weekday, -2) === $weekday; }; if (!in_array($frequency, array('MONTHLY', 'YEARLY'))) { if (is_array($rrules['BYDAY']) && !array_reduce($rrules['BYDAY'], $checkByDays, true)) { trigger_error("ICal::processRecurrences: A {$frequency} RRULE may not contain BYDAY values with numeric prefixes", E_USER_NOTICE); continue; } } elseif ($frequency === 'YEARLY' && (isset($rrules['BYWEEKNO']) && ($rrules['BYWEEKNO'] !== '' && $rrules['BYWEEKNO'] !== array()))) { if (is_array($rrules['BYDAY']) && !array_reduce($rrules['BYDAY'], $checkByDays, true)) { trigger_error('ICal::processRecurrences: A YEARLY RRULE with a BYWEEKNO part may not contain BYDAY values with numeric prefixes', E_USER_NOTICE); continue; } } } $interval = (empty($rrules['INTERVAL'])) ? 1 : (int) $rrules['INTERVAL']; // Throw an error if this isn't an integer. if (!is_int($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']) : PHP_INT_MAX; $now = date_create(); $until = $now === false ? 0 : $now->modify("{$this->defaultSpan} years")->setTime(23, 59, 59)->getTimestamp(); $untilWhile = $until; if (isset($rrules['UNTIL']) && is_string($rrules['UNTIL'])) { $untilDT = $this->iCalDateToDateTime($rrules['UNTIL']); $until = min($until, ($untilDT === false) ? $until : $untilDT->getTimestamp()); // There are certain edge cases where we need to go a little beyond the UNTIL to // ensure we get all events. Consider: // // DTSTART:20200103 // RRULE:FREQ=MONTHLY;BYDAY=-5FR;UNTIL=20200502 // // In this case the last occurrence should be 1st May, however when we transition // from April to May: // // $until ~= 2nd May // $frequencyRecurringDateTime ~= 3rd May // // And as the latter comes after the former, the while loop ends before any dates // in May have the chance to be considered. $untilWhile = min($untilWhile, ($untilDT === false) ? $untilWhile : $untilDT->modify("+1 {$this->frequencyConversion[$frequency]}")->getTimestamp()); } $eventRecurrences = array(); $frequencyRecurringDateTime = clone $initialEventDate; while ($frequencyRecurringDateTime->getTimestamp() <= $untilWhile && $count < $countLimit) { $candidateDateTimes = array(); // phpcs:ignore Squiz.ControlStructures.SwitchDeclaration.MissingDefault switch ($frequency) { case 'DAILY': if (isset($rrules['BYMONTHDAY']) && (is_array($rrules['BYMONTHDAY']) && $rrules['BYMONTHDAY'] !== array())) { if (!isset($monthDays)) { // This variable is unset when we change months (see below) $monthDays = $this->getDaysOfMonthMatchingByMonthDayRRule($rrules['BYMONTHDAY'], $frequencyRecurringDateTime); } if (!in_array($frequencyRecurringDateTime->format('j'), $monthDays)) { break; } } $candidateDateTimes[] = clone $frequencyRecurringDateTime; break; case 'WEEKLY': $initialDayOfWeek = $frequencyRecurringDateTime->format('N'); $matchingDays = array($initialDayOfWeek); if (isset($rrules['BYDAY']) && (is_array($rrules['BYDAY']) && $rrules['BYDAY'] !== array())) { // 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($this->weekdays), true); } } elseif ($rrules['WKST'] !== self::ISO_8601_WEEK_START) { $wkstTransition = array_search($rrules['WKST'], array_keys($this->weekdays), true); } $matchingDays = array_map( function ($weekday) use ($initialDayOfWeek, $wkstTransition, $interval) { $day = array_search($weekday, array_keys($this->weekdays), true); if ($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( (int) $frequencyRecurringDateTime->format('o'), (int) $frequencyRecurringDateTime->format('W'), (int) $day ); } break; case 'MONTHLY': $matchingDays = array(); if (isset($rrules['BYMONTHDAY']) && (is_array($rrules['BYMONTHDAY']) && $rrules['BYMONTHDAY'] !== array())) { $matchingDays = $this->getDaysOfMonthMatchingByMonthDayRRule($rrules['BYMONTHDAY'], $frequencyRecurringDateTime); if (isset($rrules['BYDAY']) && (is_array($rrules['BYDAY']) && $rrules['BYDAY'] !== array())) { $matchingDays = array_filter( $this->getDaysOfMonthMatchingByDayRRule($rrules['BYDAY'], $frequencyRecurringDateTime), function ($monthDay) use ($matchingDays) { return in_array($monthDay, $matchingDays); } ); } } elseif (isset($rrules['BYDAY']) && (is_array($rrules['BYDAY']) && $rrules['BYDAY'] !== array())) { $matchingDays = $this->getDaysOfMonthMatchingByDayRRule($rrules['BYDAY'], $frequencyRecurringDateTime); } else { $matchingDays[] = $frequencyRecurringDateTime->format('d'); } if (isset($rrules['BYSETPOS']) && (is_array($rrules['BYSETPOS']) && $rrules['BYSETPOS'] !== array())) { $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( (int) $frequencyRecurringDateTime->format('Y'), (int) $frequencyRecurringDateTime->format('m'), $day ); } break; case 'YEARLY': $matchingDays = array(); if (isset($rrules['BYMONTH']) && (is_array($rrules['BYMONTH']) && $rrules['BYMONTH'] !== array())) { $bymonthRecurringDatetime = clone $frequencyRecurringDateTime; foreach ($rrules['BYMONTH'] as $byMonth) { $bymonthRecurringDatetime->setDate( (int) $frequencyRecurringDateTime->format('Y'), (int) $byMonth, (int) $frequencyRecurringDateTime->format('d') ); // Determine the days of the month affected // (The interaction between BYMONTHDAY and BYDAY is resolved later.) $monthDays = array(); if (isset($rrules['BYMONTHDAY']) && (is_array($rrules['BYMONTHDAY']) && $rrules['BYMONTHDAY'] !== array())) { $monthDays = $this->getDaysOfMonthMatchingByMonthDayRRule($rrules['BYMONTHDAY'], $bymonthRecurringDatetime); } elseif (isset($rrules['BYDAY']) && (is_array($rrules['BYDAY']) && $rrules['BYDAY'] !== array())) { $monthDays = $this->getDaysOfMonthMatchingByDayRRule($rrules['BYDAY'], $bymonthRecurringDatetime); } else { $monthDays[] = $bymonthRecurringDatetime->format('d'); } // And add each of them to the list of recurrences foreach ($monthDays as $day) { $matchingDays[] = $bymonthRecurringDatetime->setDate( (int) $frequencyRecurringDateTime->format('Y'), (int) $bymonthRecurringDatetime->format('m'), $day )->format('z') + 1; } } } elseif (isset($rrules['BYWEEKNO']) && (is_array($rrules['BYWEEKNO']) && $rrules['BYWEEKNO'] !== array())) { $matchingDays = $this->getDaysOfYearMatchingByWeekNoRRule($rrules['BYWEEKNO'], $frequencyRecurringDateTime); } elseif (isset($rrules['BYYEARDAY']) && (is_array($rrules['BYYEARDAY']) && $rrules['BYYEARDAY'] !== array())) { $matchingDays = $this->getDaysOfYearMatchingByYearDayRRule($rrules['BYYEARDAY'], $frequencyRecurringDateTime); } elseif (isset($rrules['BYMONTHDAY']) && (is_array($rrules['BYMONTHDAY']) && $rrules['BYMONTHDAY'] !== array())) { $matchingDays = $this->getDaysOfYearMatchingByMonthDayRRule($rrules['BYMONTHDAY'], $frequencyRecurringDateTime); } if (isset($rrules['BYDAY']) && (is_array($rrules['BYDAY']) && $rrules['BYDAY'] !== array())) { if (isset($rrules['BYYEARDAY']) && ($rrules['BYYEARDAY'] !== '' && $rrules['BYYEARDAY'] !== array()) \|\| isset($rrules['BYMONTHDAY']) && ($rrules['BYMONTHDAY'] !== '' && $rrules['BYMONTHDAY'] !== array()) \|\| isset($rrules['BYWEEKNO']) && ($rrules['BYWEEKNO'] !== '' && $rrules['BYWEEKNO'] !== array())) { $matchingDays = array_filter( $this->getDaysOfYearMatchingByDayRRule($rrules['BYDAY'], $frequencyRecurringDateTime), function ($yearDay) use ($matchingDays) { return in_array($yearDay, $matchingDays); } ); } elseif ($matchingDays === array()) { $matchingDays = $this->getDaysOfYearMatchingByDayRRule($rrules['BYDAY'], $frequencyRecurringDateTime); } } if ($matchingDays === array()) { $matchingDays = array($frequencyRecurringDateTime->format('z') + 1); } else { sort($matchingDays); } if (isset($rrules['BYSETPOS']) && (is_array($rrules['BYSETPOS']) && $rrules['BYSETPOS'] !== array())) { $matchingDays = $this->filterValuesUsingBySetPosRRule($rrules['BYSETPOS'], $matchingDays); } foreach ($matchingDays as $day) { $clonedDateTime = clone $frequencyRecurringDateTime; $candidateDateTimes[] = $clonedDateTime->setDate( (int) $frequencyRecurringDateTime->format('Y'), 1, $day ); } break; } foreach ($candidateDateTimes as $candidate) { $timestamp = $candidate->getTimestamp(); if ($timestamp <= $initialEventDate->getTimestamp()) { continue; } if ($timestamp > $until) { break; } // Exclusions $isExcluded = array_filter($exdates, function ($exdate) use ($timestamp) { return $exdate->getTimestamp() === $timestamp; }); if (isset($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, // and if RRULE[COUNT] (if set) is reached then break. $count++; if ($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'); } } // $monthDays is set in the DAILY frequency if the BYMONTHDAY stanza is present in // the RRULE. The variable only needs to be updated when we change months, so we // unset it here, prompting a recreation next iteration. if (isset($monthDays) && $frequencyRecurringDateTime->format('m') !== $monthPreMove) { unset($monthDays); } } unset($monthDays); // Unset it here as well, so it doesn't bleed into the calculation of the next recurring event. // 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); $this->cal['VEVENT'] = $events; } /** * Resolves values from indices of the range 1 -> $limit. * * For instance, if passed [1, 4, -16] and 28, this will return [1, 4, 13]. * * @param array $indexes * @param integer $limit * @return array / protected function resolveIndicesOfRange(array $indexes, $limit) { $matching = array(); foreach ($indexes as $index) { if ($index > 0 && $index <= $limit) { $matching[] = $index; } elseif ($index < 0 && -$index <= $limit) { $matching[] = $index + $limit + 1; } } sort($matching); return $matching; } /* * 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, $initialDateTime) { $matchingDays = array(); $currentMonth = $initialDateTime->format('n'); foreach ($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'); if ($bydayDateTime->format('n') === $currentMonth) { $matchingDays[] = $bydayDateTime->format('j'); } } elseif ($ordwk > 0) { // +ve {ordwk} $bydayDateTime->modify((--$ordwk) . ' week'); if ($bydayDateTime->format('n') === $currentMonth) { $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; } /* * Find all days of a month that match the BYMONTHDAY stanza of an RRULE. * * RRUle Syntax: * BYMONTHDAY={bymodaylist} * * Where: * bymodaylist = {monthdaynum}[,{monthdaynum}...] * monthdaynum = ([+] \|\| -) {ordmoday} * ordmoday = 1 to 31 * * @param array $byMonthDays * @param \DateTime $initialDateTime * @return array / protected function getDaysOfMonthMatchingByMonthDayRRule(array $byMonthDays, $initialDateTime) { return $this->resolveIndicesOfRange($byMonthDays, (int) $initialDateTime->format('t')); } /* * Find all days of a year that match the BYDAY stanza of an RRULE. * * With no {ordwk}, then return the day number of every {weekday} * within the year. * * With a +ve {ordwk}, then return the {ordwk} {weekday} within the * year. * * With a -ve {ordwk}, then return the {ordwk}-to-last {weekday} * within the year. * * 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 getDaysOfYearMatchingByDayRRule(array $byDays, $initialDateTime) { $matchingDays = array(); foreach ($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 year // (Or last if we have a -ve {ordwk}) $bydayDateTime->modify( (($ordwk < 0) ? 'Last' : 'First') . ' ' . $this->weekdays[substr($weekday, -2)] . // e.g. "Monday" ' of ' . (($ordwk < 0) ? 'December' : 'January') . ' ' . $initialDateTime->format('Y') // e.g. "2018" ); if ($ordwk < 0) { // -ve {ordwk} $bydayDateTime->modify((++$ordwk) . ' week'); $matchingDays[] = $bydayDateTime->format('z') + 1; } elseif ($ordwk > 0) { // +ve {ordwk} $bydayDateTime->modify((--$ordwk) . ' week'); $matchingDays[] = $bydayDateTime->format('z') + 1; } else { // No {ordwk} while ($bydayDateTime->format('Y') === $initialDateTime->format('Y')) { $matchingDays[] = $bydayDateTime->format('z') + 1; $bydayDateTime->modify('+1 week'); } } } // Sort into ascending order sort($matchingDays); return $matchingDays; } /* * Find all days of a year that match the BYYEARDAY stanza of an RRULE. * * RRUle Syntax: * BYYEARDAY={byyrdaylist} * * Where: * byyrdaylist = {yeardaynum}[,{yeardaynum}...] * yeardaynum = ([+] \|\| -) {ordyrday} * ordyrday = 1 to 366 * * @param array $byYearDays * @param \DateTime $initialDateTime * @return array / protected function getDaysOfYearMatchingByYearDayRRule(array $byYearDays, $initialDateTime) { // `\DateTime::format('L')` returns 1 if leap year, 0 if not. $daysInThisYear = $initialDateTime->format('L') ? 366 : 365; return $this->resolveIndicesOfRange($byYearDays, $daysInThisYear); } /* * Find all days of a year that match the BYWEEKNO stanza of an RRULE. * * Unfortunately, the RFC5545 specification does not specify exactly * how BYWEEKNO should expand on the initial DTSTART when provided * without any other stanzas. * * A comparison of expansions used by other ics parsers may be found * at https://github.com/s0600204/ics-parser-1/wiki/byweekno * * This method uses the same expansion as the python-dateutil module. * * RRUle Syntax: * BYWEEKNO={bywknolist} * * Where: * bywknolist = {weeknum}[,{weeknum}...] * weeknum = ([+] \|\| -) {ordwk} * ordwk = 1 to 53 * * @param array $byWeekNums * @param \DateTime $initialDateTime * @return array / protected function getDaysOfYearMatchingByWeekNoRRule(array $byWeekNums, $initialDateTime) { // `\DateTime::format('L')` returns 1 if leap year, 0 if not. $isLeapYear = $initialDateTime->format('L'); $initialYear = date_create("first day of January {$initialDateTime->format('Y')}"); $firstDayOfTheYear = ($initialYear === false) ? null : $initialYear->format('D'); $weeksInThisYear = ($firstDayOfTheYear === 'Thu' \|\| $isLeapYear && $firstDayOfTheYear === 'Wed') ? 53 : 52; $matchingWeeks = $this->resolveIndicesOfRange($byWeekNums, $weeksInThisYear); $matchingDays = array(); $byweekDateTime = clone $initialDateTime; foreach ($matchingWeeks as $weekNum) { $dayNum = $byweekDateTime->setISODate( (int) $initialDateTime->format('Y'), $weekNum, 1 )->format('z') + 1; for ($x = 0; $x < 7; ++$x) { $matchingDays[] = $x + $dayNum; } } sort($matchingDays); return $matchingDays; } /* * Find all days of a year that match the BYMONTHDAY stanza of an RRULE. * * RRule Syntax: * BYMONTHDAY={bymodaylist} * * Where: * bymodaylist = {monthdaynum}[,{monthdaynum}...] * monthdaynum = ([+] \|\| -) {ordmoday} * ordmoday = 1 to 31 * * @param array $byMonthDays * @param \DateTime $initialDateTime * @return array / protected function getDaysOfYearMatchingByMonthDayRRule(array $byMonthDays, $initialDateTime) { $matchingDays = array(); $monthDateTime = clone $initialDateTime; for ($month = 1; $month < 13; $month++) { $monthDateTime->setDate( (int) $initialDateTime->format('Y'), $month, 1 ); $monthDays = $this->getDaysOfMonthMatchingByMonthDayRRule($byMonthDays, $monthDateTime); foreach ($monthDays as $day) { $matchingDays[] = $monthDateTime->setDate( (int) $initialDateTime->format('Y'), (int) $monthDateTime->format('m'), $day )->format('z') + 1; } } 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) { $filteredMatches = array(); foreach ($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 * @throws \Exception / protected function processDateConversions() { $events = (isset($this->cal['VEVENT'])) ? $this->cal['VEVENT'] : array(); if ($events !== array()) { 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']; } } $this->cal['VEVENT'] = $events; } } /* * Returns an array of Events. * Every event is a class with the event * details being properties within it. * * @return array / public function events() { $array = $this->cal; $array = isset($array['VEVENT']) ? $array['VEVENT'] : array(); $events = array(); foreach ($array as $event) { $events[] = new CoBlocks_ICal_Event($event); } return $events; } /* * Returns the calendar name * * @return string / public function calendarName() { return isset($this->cal['VCALENDAR']['X-WR-CALNAME']) ? $this->cal['VCALENDAR']['X-WR-CALNAME'] : ''; } /* * Returns the calendar description * * @return string / public function calendarDescription() { return isset($this->cal['VCALENDAR']['X-WR-CALDESC']) ? $this->cal['VCALENDAR']['X-WR-CALDESC'] : ''; } /* * Returns the calendar time zone * * @param boolean $ignoreUtc * @return string\|null / public function calendarTimeZone($ignoreUtc = false) { 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 = $this->cal; return isset($array['VFREEBUSY']) ? $array['VFREEBUSY'] : array(); } /* * Returns a boolean value whether the * current calendar has events or not * * @return boolean / public function hasEvents() { return ($this->events() !== array()) ?: false; } /* * 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 $rangeEnd * @return array * @throws \Exception / public function eventsFromRange($rangeStart = null, $rangeEnd = null) { // Sort events before processing range $events = $this->sortEventsWithOrder($this->events()); if ($events === array()) { return array(); } $extendedEvents = array(); if (!is_null($rangeStart)) { try { $rangeStart = new \DateTime($rangeStart, new \DateTimeZone($this->getDefaultTimeZone())); } catch (\Exception $exception) { error_log("ICal::eventsFromRange: Invalid date passed ({$rangeStart})"); $rangeStart = false; } } else { $rangeStart = new \DateTime('now', new \DateTimeZone($this->getDefaultTimeZone())); } if (!is_null($rangeEnd)) { try { $rangeEnd = new \DateTime($rangeEnd, new \DateTimeZone($this->getDefaultTimeZone())); } catch (\Exception $exception) { error_log("ICal::eventsFromRange: Invalid date passed ({$rangeEnd})"); $rangeEnd = false; } } else { $rangeEnd = new \DateTime('now', new \DateTimeZone($this->getDefaultTimeZone())); $rangeEnd->modify('+20 years'); } if ($rangeEnd !== false && $rangeStart !== false) { // If start and end are identical and are dates with no times... if ($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; } } return $extendedEvents; } /* * Returns a sorted array of the events following a given string * * @param string $interval * @return array / public function eventsFromInterval($interval) { $timeZone = $this->getDefaultTimeZone(); $rangeStart = new \DateTime('now', new \DateTimeZone($timeZone)); $rangeEnd = new \DateTime('now', new \DateTimeZone($timeZone)); $dateInterval = \DateInterval::createFromDateString($interval); if ($dateInterval instanceof \DateInterval) { $rangeEnd->add($dateInterval); } return $this->eventsFromRange($rangeStart->format('Y-m-d'), $rangeEnd->format('Y-m-d')); } /* * 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, $sortOrder = SORT_ASC) { $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 $timeZone * @return boolean / protected function isValidTimeZoneId($timeZone) { 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 $timeZone * @return boolean / protected function isValidIanaTimeZoneId($timeZone) { 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 $timeZone * @return boolean / public function isValidCldrTimeZoneId($timeZone) { 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 $timeZone * @return boolean / public function isValidWindowsTimeZoneId($timeZone) { return array_key_exists(html_entity_decode($timeZone), self::$windowsTimeZonesMap); } /* * Parses a duration and applies it to a date * * @param string $date * @param \DateInterval $duration * @return \DateTime\|false / protected function parseDuration($date, $duration) { $dateTime = date_create($date); if ($dateTime === false) { return false; } $dateTime->modify("{$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"); return $dateTime; } /* * Removes unprintable ASCII and UTF-8 characters * * @param string $data * @return string\|null / protected function removeUnprintableChars($data) { return preg_replace('/[\x00-\x1F\x7F]/u', '', $data); } /* * Provides a polyfill for PHP 7.2's `mb_chr()`, which is a multibyte safe version of `chr()`. * Multibyte safe. * * @param integer $code * @return string / protected function mb_chr($code) // phpcs:ignore PSR1.Methods.CamelCapsMethodName.NotCamelCaps { if (function_exists('mb_chr')) { return mb_chr($code); } else { if (($code %= 0x200000) < 0x80) { $s = chr($code); } elseif ($code < 0x800) { $s = chr(0xc0 \| $code >> 6) . chr(0x80 \| $code & 0x3f); } elseif ($code < 0x10000) { $s = chr(0xe0 \| $code >> 12) . chr(0x80 \| $code >> 6 & 0x3f) . chr(0x80 \| $code & 0x3f); } else { $s = chr(0xf0 \| $code >> 18) . chr(0x80 \| $code >> 12 & 0x3f) . chr(0x80 \| $code >> 6 & 0x3f) . chr(0x80 \| $code & 0x3f); } return $s; } } /* * Places double-quotes around texts that have characters not permitted * in parameter-texts, but are permitted in quoted-texts. * * @param string $candidateText * @return string / protected function escapeParamText($candidateText) { if (strpbrk($candidateText, ':;,') !== false) { return '"' . $candidateText . '"'; } return $candidateText; } /* * Replace curly quotes and other special characters with their standard equivalents * @see https://utf8-chartable.de/unicode-utf8-table.pl?start=8211&utf8=string-literal * * @param string $input * @return string / protected function cleanCharacters($input) { return strtr( $input, array( "\xe2\x80\x98" => "'", // ‘ "\xe2\x80\x99" => "'", // ’ "\xe2\x80\x9a" => "'", // ‚ "\xe2\x80\x9b" => "'", // ‛ "\xe2\x80\x9c" => '"', // “ "\xe2\x80\x9d" => '"', // ” "\xe2\x80\x9e" => '"', // „ "\xe2\x80\x9f" => '"', // ‟ "\xe2\x80\x93" => '-', // – "\xe2\x80\x94" => '--', // — "\xe2\x80\xa6" => '...', // … $this->mb_chr(145) => "'", // ‘ $this->mb_chr(146) => "'", // ’ $this->mb_chr(147) => '"', // “ $this->mb_chr(148) => '"', // ” $this->mb_chr(150) => '-', // – $this->mb_chr(151) => '--', // — $this->mb_chr(133) => '...', // … ) ); } /* * Parses a list of excluded dates * to be applied to an Event * * @param array $event * @return array / public function parseExdates(array $event) { if (empty($event['EXDATE_array'])) { return array(); } else { $exdates = $event['EXDATE_array']; } $output = array(); $currentTimeZone = new \DateTimeZone($this->getDefaultTimeZone()); foreach ($exdates as $subArray) { end($subArray); $finalKey = key($subArray); foreach (array_keys($subArray) as $key) { if ($key === 'TZID') { $currentTimeZone = $this->timeZoneStringToDateTimeZone($subArray[$key]); } elseif (is_numeric($key)) { $icalDate = $subArray[$key]; if (substr($icalDate, -1) === 'Z') { $currentTimeZone = new \DateTimeZone(self::TIME_ZONE_UTC); } $output[] = new \DateTime($icalDate, $currentTimeZone); if ($key === $finalKey) { // Reset to default $currentTimeZone = new \DateTimeZone($this->getDefaultTimeZone()); } } } } return $output; } /* * Checks if a date string is a valid date * * @param string $value * @return boolean * @throws \Exception / public function isValidDate($value) { if (!$value) { return false; } try { new \DateTime($value); return true; } catch (\Exception $exception) { return false; } } /* * Checks if a filename exists as a file or URL * * @param string $filename * @return boolean / protected function isFileOrUrl($filename) { return (file_exists($filename) \|\| filter_var($filename, FILTER_VALIDATE_URL)) ?: false; } /* * Reads an entire file or URL into an array * * @param string $filename * @return array * @throws \Exception / protected function fileOrUrl($filename) { // If this is a URL, let's use wp_safe_remote_get. if ( filter_var( $filename, FILTER_VALIDATE_URL ) ) { $request = wp_safe_remote_get( $filename ); if ( is_wp_error( $request ) ) { return false; } return explode( "\n", wp_remote_retrieve_body( $request ) ); } } /* * 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 string $timeZoneString * @return \DateTimeZone */ public function timeZoneStringToDateTimeZone($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->getDefaultTimeZone()); } }

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