class.ilCalendarExport.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

include_once './Services/Calendar/classes/iCal/class.ilICalWriter.php';
include_once './Services/Calendar/classes/class.ilCalendarCategory.php';
include_once './Services/Calendar/classes/class.ilCalendarEntry.php';
include_once './Services/Calendar/classes/class.ilCalendarCategoryAssignments.php';

class ilCalendarExport
{
        protected $calendars = array();
        protected $writer = null;
        
        public function __construct($a_calendar_ids)
        {
                $this->calendars = $a_calendar_ids;
                $this->writer = new ilICalWriter();
        }
        
        public function export()
        {
                $this->writer->addLine('BEGIN:VCALENDAR');
                $this->writer->addLine('VERSION:2.0');
                $this->writer->addLine('PRODID:-//ilias.de/NONSGML ILIAS Calendar V4.1//EN');
                
                $this->addTimezone();
                $this->addCategories();
                
                $this->writer->addLine('END:VCALENDAR');
        }
        
        protected function addTimezone()
        {
                // TODO
        }
        
        protected function addCategories()
        {
                foreach($this->calendars as $category_id)
                {
                        foreach(ilCalendarCategoryAssignments::_getAssignedAppointments(
                                ilCalendarCategories::_getInstance()->getSubitemCategories($category_id)
                                ) as $app_id)
                        {
                                $app = new ilCalendarEntry($app_id);
                                if($app->isMilestone())
                                {
                                        $this->createVTODO($app);
                                }
                                else
                                {
                                        $this->createVEVENT($app);
                                }
                        }
                }
        }
        
        protected function createVTODO($app)
        {
                // TODO
                return true;
        }
        
        protected function createVEVENT($app)
        {
                global $ilUser;
                
                $this->writer->addLine('BEGIN:VEVENT');
                // TODO only domain
                $this->writer->addLine('UID:'.ilICalWriter::escapeText(
                        $app->getEntryId().'_'.CLIENT_ID.'@'.ILIAS_HTTP_PATH));
                        
                #$last_mod = $app->getLastUpdate()->get(IL_CAL_FKT_DATE,'Ymd\THis\Z',ilTimeZone::UTC);
                $last_mod = $app->getLastUpdate()->get(IL_CAL_FKT_DATE,'Ymd\THis\Z',$ilUser->getTimeZone());
                $this->writer->addLine('LAST-MODIFIED:'.$last_mod);     
                
                if($app->isFullday())
                {
                        // According to RFC 5545 3.6.1 DTEND is not inklusive.
                        // But ILIAS stores inklusive dates in the database.
                        $app->getEnd()->increment(IL_CAL_DAY,1);

                        #$start = $app->getStart()->get(IL_CAL_FKT_DATE,'Ymd\Z',ilTimeZone::UTC);
                        $start = $app->getStart()->get(IL_CAL_FKT_DATE,'Ymd',$ilUser->getTimeZone());
                        #$end = $app->getEnd()->get(IL_CAL_FKT_DATE,'Ymd\Z',ilTimeZone::UTC);
                        $end = $app->getEnd()->get(IL_CAL_FKT_DATE,'Ymd',$ilUser->getTimeZone());
                        
                        $this->writer->addLine('DTSTART;VALUE=DATE:' . $start);
                        $this->writer->addLine('DTEND;VALUE=DATE:'.$end);
                }
                else
                {
                        #$start = $app->getStart()->get(IL_CAL_FKT_DATE,'Ymd\THis\Z',ilTimeZone::UTC);
                        $start = $app->getStart()->get(IL_CAL_FKT_DATE,'Ymd\THis',$ilUser->getTimeZone());
                        #$end = $app->getEnd()->get(IL_CAL_FKT_DATE,'Ymd\THis\Z',ilTimeZone::UTC);
                        $end = $app->getEnd()->get(IL_CAL_FKT_DATE,'Ymd\THis',$ilUser->getTimeZone());
                        $this->writer->addLine('DTSTART;TZID='.$ilUser->getTimezone().':'. $start);
                        $this->writer->addLine('DTEND;TZID='.$ilUser->getTimezone().':'.$end);
                }
                
                
                $this->createRecurrences($app);
                
                $this->writer->addLine('SUMMARY:'.ilICalWriter::escapeText($app->getPresentationTitle()));
                if(strlen($app->getDescription()))
                        $this->writer->addLine('DESCRIPTION:'.ilICalWriter::escapeText($app->getDescription()));
                if(strlen($app->getLocation()))
                        $this->writer->addLine('LOCATION:'.ilICalWriter::escapeText($app->getLocation()));

                // TODO: URL
                $this->buildAppointmentUrl($app);

                $this->writer->addLine('END:VEVENT');
                
        }
        
        protected function createRecurrences($app)
        {
                include_once './Services/Calendar/classes/class.ilCalendarRecurrences.php';
                foreach(ilCalendarRecurrences::_getRecurrences($app->getEntryId()) as $rec)
                {
                        foreach(ilCalendarRecurrenceExclusions::getExclusionDates($app->getEntryId()) as $excl)
                        {
                                $this->writer->addLine($excl->toICal());
                        }
                        $this->writer->addLine($rec->toICal());
                }
        }
        
        
        public function getExportString()
        {
                return $this->writer->__toString();
        }

        protected function buildAppointmentUrl(ilCalendarEntry $entry)
        {
                $cat = ilCalendarCategory::getInstanceByCategoryId(
                        current((array) ilCalendarCategoryAssignments::_lookupCategories($entry->getEntryId()))
                );

                if($cat->getType() != ilCalendarCategory::TYPE_OBJ)
                {
                        $this->writer->addLine('URL;VALUE=URI:'.ILIAS_HTTP_PATH);
                }
                else
                {
                        $refs = ilObject::_getAllReferences($cat->getObjId());

                        include_once './classes/class.ilLink.php';
                        $this->writer->addLine(
                                'URL;VALUE=URI:'.ilLink::_getLink(current((array) $refs))
                        );
                }
        }
}