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Add iCal functionality

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o-psi
2024-02-08 12:59:36 -06:00
parent 50b2c3ad6c
commit e2392c3c6c
11 changed files with 2749 additions and 5 deletions
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142
plugins/zapcal/includes/timezone.php Normal file
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<?php
/**
* timezone.php - create timezone data for use in icalendar file
*
* @package ZapCalLib
* @author Dan Cogliano <http://zcontent.net>
* @copyright Copyright (C) 2006 - 2017 by Dan Cogliano
* @license GNU GPLv3 <http://www.gnu.org/licenses/gpl.html>
* @link http://icalendar.org/php-library.html
*/
// No direct access
defined('_ZAPCAL') or die( 'Restricted access' );
/**
* Zap Calendar Time Zone Helper Class
*
* Class to help create timezone section of iCalendar file
*
* @copyright Copyright (C) 2006 - 2016 by Dan Cogliano
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
class ZCTimeZoneHelper {
/**
* getTZNode creates VTIMEZONE section in an iCalendar file
*
* @param @startyear int start year of date range
*
* @param @endyear int end year of date range
*
* @param $tzid string PHP timezone, use underscore for multiple words (i.e. "New_York" for "New York")
*
* @param $parentnode object iCalendar object where VTIMEZONE will be created
*
* @return object return VTIMEZONE object
*/
static function getTZNode($startyear, $endyear, $tzid, $parentnode)
{
$tzmins = array();
$tzmaxs = array();
if(!array_key_exists($tzid,$tzmins) || $tzmins[$tzid] > $startyear)
{
$tzmins[$tzid] = $startyear;
}
if(!array_key_exists($tzid,$tzmaxs) || $tzmaxs[$tzid] < $endyear)
{
$tzmaxs[$tzid] = $endyear;
}
foreach(array_keys($tzmins) as $tzid)
{
$tmin = $tzmins[$tzid] - 1;
if(array_key_exists($tzid,$tzmaxs))
{
$tmax = $tzmaxs[$tzid] + 1;
}
else
{
$tmax = $tzmins[$tzid] + 1;
}
$tstart = gmmktime(0,0,0,1,1,$tmin);
$tend = gmmktime(23,59,59,12,31,$tmax);
$tz = new DateTimeZone($tzid);
$transitions = $tz->getTransitions($tstart,$tend);
$tzobj = new ZCiCalNode("VTIMEZONE", $parentnode, true);
$datanode = new ZCiCalDataNode("TZID:" . str_replace("_"," ",$tzid));
$tzobj->data[$datanode->getName()] = $datanode;
$count = 0;
$lasttransition = null;
if(count($transitions) == 1)
{
// not enough transitions found, probably UTC
// lets add fake transition at end for those systems that need it (i.e. Outlook)
$t2 = array();
$t2["isdst"] = $transitions[0]["isdst"];
$t2["offset"] = $transitions[0]["offset"];
$t2["ts"] = $tstart;
$t2["abbr"] = $transitions[0]["abbr"];
$transitions[] = $t2;
}
foreach($transitions as $transition)
{
$count++;
if($count == 1)
{
$lasttransition = $transition;
continue; // skip first item
}
if($transition["isdst"] == 1)
{
$tobj = new ZCiCalNode("DAYLIGHT", $tzobj);
}
else
{
$tobj = new ZCiCalNode("STANDARD", $tzobj);
}
//$tzobj->data[$tobj->getName()] == $tobj;
// convert timestamp to local time zone
$ts = ZDateHelper::toUnixDateTime(ZDateHelper::toLocalDateTime(ZDateHelper::toSQLDateTime($transition["ts"]),$tzid));
$datanode = new ZCiCalDataNode("DTSTART:".ZDateHelper::toICalDateTime($ts));
$tobj->data[$datanode->getName()] = $datanode;
//echo $ts . " => " . ZDateHelper::toICalDateTime($ts) . "<br/>\n"; exit;
$toffset = $lasttransition["offset"];
$thours = intval($toffset/60/60);
$tmins = abs($toffset)/60 - intval(abs($toffset)/60/60)*60;
if($thours < 0)
{
$offset = sprintf("%03d%02d",$thours,$tmins);
}
else
{
$offset = sprintf("+%02d%02d",$thours,$tmins);
}
$datanode = new ZCiCalDataNode("TZOFFSETFROM:".$offset);
$tobj->data[$datanode->getName()] = $datanode;
$toffset = $transition["offset"];
$thours = intval($toffset/60/60);
$tmins = abs($toffset)/60 - intval(abs($toffset)/60/60)*60;
if($thours < 0)
{
$offset = sprintf("%03d%02d",$thours,$tmins);
}
else
{
$offset = sprintf("+%02d%02d",$thours,$tmins);
}
$datanode = new ZCiCalDataNode("TZOFFSETTO:".$offset);
$tobj->data[$datanode->getName()] = $datanode;
$datanode = new ZCiCalDataNode("TZNAME:".$transition["abbr"]);
$tobj->data[$datanode->getName()] = $datanode;
$lasttransition = $transition;
}
}
return $tzobj;
}
}