egroupware/calendar/inc/class.calendar_holidays.inc.php

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<?php
/**
* EGroupware - Calendar holidays
*
* @link http://www.egroupware.org
* @package calendar
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright (c) 2016 by RalfBecker-At-outdoor-training.de
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @version $Id$
*/
use EGroupware\Api;
/**
* Calendar holidays
*
* Holidays are read from:
* - a given iCal URL or
* - json file with 2-digit iso country-code: URL pairs is read from https://community.egroupware.org or
* - json file is read from /calendar/setup/ical_holiday_urls.json
*
* Holidays are cached on tree or instance level, later for custom urls.
* As fetching and parsing iCal files is expensive, we always render them
* from previous (requested) year until next 5 years.
*/
class calendar_holidays
{
const URL_CACHE_TIME = 864000;
const URL_FAIL_CACHE_TIME = 300;
const EGW_HOLIDAY_URL = 'https://community.egroupware.org/egw';
const HOLIDAY_PATH = '/calendar/setup/ical_holiday_urls.json';
const HOLIDAY_CACHE_TIME = 864000;
/**
* Read holidays for given country/url and year
*
* @param string $country 2-digit iso country code or URL
* @param int $year =null default current year
* @return array of Ymd => array of array with values for keys 'occurence','month','day','name', (commented out) 'title'
*/
public static function read($country, $year=null)
{
if (!$year) $year = (int)Api\DateTime::to('now', 'Y');
$level = self::is_url($country) ? Api\Cache::INSTANCE : Api\Cache::TREE;
$holidays = Api\Cache::getCache($level, __CLASS__, $country.':'.$year);
// if we dont find holidays in cache, we render from previous year until next 5 years
if (!isset($holidays) && ($years = self::render($country, $year-1, $year+5)))
{
foreach($years as $y => $data)
{
Api\Cache::setCache($level, __CLASS__, $country.':'.$y, $data, self::HOLIDAY_CACHE_TIME);
}
$holidays = $years[$year];
}
return (array)$holidays;
}
/**
* Fetch holiday iCal and convert it to usual holiday format
*
* @param string $country 2-digit iso country code or URL
* @param int $year =null default current year
* @param int $until_year =null default, fetch only one year, if given result is indexed additional by year
* @return array of Ymd => array of array with values for keys 'occurence','month','day','name', (commented out) 'title'
*/
public static function render($country, $year=null, $until_year=null)
{
if (!$year) $year = (int)Api\DateTime::to('now', 'Y');
$end_year = $until_year && $year < $until_year ? $until_year : $year;
$starttime = microtime(true);
if (!($holidays = self::fetch($country)))
{
return array();
}
$years = array();
foreach($holidays as $event)
{
$start = new Api\DateTime($event['start']);
$end = new Api\DateTime($event['end']);
if ($start->format('Y') > $end_year) continue;
if ($end->format('Y') < $year && !$event['recur_type']) continue;
// recuring events
if ($event['recur_type'])
{
// calendar_rrule limits no enddate, to 5 years
if (!$event['recur_enddate']) $event['recur_enddate'] = (1+$end_year).'0101';
$rrule = calendar_rrule::event2rrule($event);
if ($rrule->enddate && $rrule->enddate->format('Y') < $year) continue;
foreach($rrule as $rtime)
{
if (($y = (int)$rtime->format('Y')) < $year) continue;
if ($y > $end_year) break;
$ymd = (int)$rtime->format('Ymd');
$years[$y][(string)$ymd][] = array(
'day' => $ymd % 100,
'month' => ($ymd / 100) % 100,
'occurence' => $y,
'name' => $event['title'],
//'title' => $event['description'],
);
}
}
else
{
$end_ymd = (int)$end->format('Ymd');
while(($ymd = (int)$start->format('Ymd')) <= $end_ymd)
{
$y = (int)$start->format('Y');
$years[$y][(string)$ymd][] = array(
'day' => $ymd % 100,
'month' => ($ymd / 100) % 100,
'occurence' => $y,
'name' => $event['title'],
//'title' => $event['description'],
);
$start->add('1day');
}
}
}
foreach($years as $y => &$data)
{
ksort($data);
}
error_log(__METHOD__."('$country', $year, $end_year) took ". number_format(microtime(true)-$starttime, 3).'s to fetch '.count(call_user_func_array('array_merge', $years)).' events');
unset($starttime);
return $until_year ? $years : $years[$year];
}
protected static function is_url($url)
{
return $url[0] == '/' || strpos($url, '://') !== false;
}
/**
* Fetch iCal for given country
*
* @param string $country 2-digit iso country code or URL
* @return array|Iterator parsed events
*/
protected static function fetch($country)
{
if (!($url = self::is_url($country) ? $country : self::ical_url($country)))
{
error_log("No holiday iCal for '$country'!");
return array();
}
if (!($f = fopen($url, 'r', false, Api\Framework::proxy_context())))
{
error_log("Can NOT open holiday iCal '$url' for country '$country'!");
return array();
}
// php does not automatic gzip decode, but it does not accept that in request headers
// iCloud eg. always gzip compresses: https://p16-calendars.icloud.com/holidays/au_en-au.ics
foreach($http_response_header as $h)
{
if (preg_match('/^content-encoding:.*gzip/i', $h))
{
stream_filter_append($f, 'zlib.inflate', STREAM_FILTER_READ, array('window' => 15|16));
break;
}
}
$parser = new calendar_ical();
if (!($icals = $parser->icaltoegw($f)))
{
error_log("Error parsing holiday iCal '$url' for country '$country'!");
return array();
}
return $icals;
}
/**
* Get iCal url for holidays of given country
*
* We first try to fetch urls from https://community.egroupware.org and if that fails we use the local one.
*
* @param string $country
* @return string|boolean|null string with url, false if we cant load urls, NULL if $country is not included
*/
protected static function ical_url($country)
{
$urls = Api\Cache::getTree(__CLASS__, 'ical_holiday_urls');
if (!isset($urls))
{
if (!($json = file_get_contents(self::EGW_HOLIDAY_URL.self::HOLIDAY_PATH, false,
Api\Framework::proxy_context(null, null, array('timeout' => 1)))))
{
$json = file_get_contents(EGW_SERVER_ROOT.self::HOLIDAY_PATH);
}
if (!$json || !($urls = json_decode($json, true)))
{
error_log(__METHOD__."() cant read ical_holiday_urls.json!");
$urls = false;
}
Api\Cache::setTree(__CLASS__, 'ical_holiday_urls', $urls, $urls ? self::URL_CACHE_TIME : self::URL_FAIL_CACHE_TIME);
}
return $urls[$country];
}
}
// some tests when url is called direct
if (isset($_SERVER['SCRIPT_FILENAME']) && $_SERVER['SCRIPT_FILENAME'] == __FILE__)
{
$GLOBALS['egw_info'] = array(
'flags' => array(
'currentapp' => 'login',
)
);
include('../../header.inc.php');
$country = !empty($_GET['country']) && preg_match('/^[A-Z]{2}$/i', $_GET['country']) ? strtoupper($_GET['country']) : 'DE';
$year = !empty($_GET['year']) && (int)$_GET['year'] > 2000 ? (int)$_GET['year'] : (int)date('Y');
$year_until = !empty($_GET['year_until']) && (int)$_GET['year_until'] >= $year ? (int)$_GET['year_until'] : $year;
Api\Header\Content::type('holidays-'.$country.'.txt', 'text/plain', 0, true, false);
print_r(calendar_holidays::render($country, $year, $year_until));
}