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<?php
/**
* iCalendar functions for the Calendar plugin
*
* @version 0.7-beta
* @author Lazlo Westerhof <hello@lazlo.me>
* @author Thomas Bruederli <bruederli@kolabsys.com>
* @author Bogomil "Bogo" Shopov <shopov@kolabsys.com>
*
* Copyright (C) 2010, Lazlo Westerhof - Netherlands
* Copyright (C) 2011, Kolab Systems AG <contact@kolabsys.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Additional permission is granted to distribute and use this file under
* the terms of the GNU General Public License Version 2 in conjunction with
* the Roundcube Web Mailer Version 0.7 as distributed by the Roundcube
* Community (http://roundcube.net).
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Class to parse and build vCalendar (iCalendar) files
*
* Uses the Horde:iCalendar class for parsing. To install:
* > pear channel-discover pear.horde.org
* > pear install horde/Horde_Icalendar
*
*/
class calendar_ical
{
const EOL = "\r\n";
private $rc;
private $cal;
private $timezone = 'Z';
public $method;
public $events = array();
function __construct($cal)
{
$this->cal = $cal;
$this->rc = $cal->rc;
// compose timezone string
if ($cal->timezone) {
$hours = floor($cal->timezone + $cal->dst_active);
$this->timezone = sprintf('%s%02d:%02d', ($hours >= 0 ? '+' : ''), $hours, ($cal->timezone - $hours) * 60);
}
}
/**
* Import events from iCalendar format
*
* @param string vCalendar input
* @param string Input charset (from envelope)
* @return array List of events extracted from the input
*/
public function import($vcal, $charset = RCMAIL_CHARSET)
{
$parser = $this->get_parser();
$parser->parsevCalendar($vcal, 'VCALENDAR', $charset);
$this->method = $parser->getAttributeDefault('METHOD', '');
$this->events = $seen = array();
if ($data = $parser->getComponents()) {
foreach ($data as $comp) {
if ($comp->getType() == 'vEvent') {
$event = $this->_to_rcube_format($comp);
if (!$seen[$event['uid']]++)
$this->events[] = $event;
}
}
}
return $this->events;
}
/**
* Read iCalendar events from a file
*
* @param string File path to read from
* @return array List of events extracted from the file
*/
public function import_from_file($filepath)
{
$this->events = $seen = array();
$fp = fopen($filepath, 'r');
// check file content first
$begin = fread($fp, 1024);
if (!preg_match('/BEGIN:VCALENDAR/i', $begin))
return $this->events;
$parser = $this->get_parser();
$buffer = '';
fseek($fp, 0);
while (($line = fgets($fp, 2048)) !== false) {
$buffer .= $line;
if (preg_match('/END:VEVENT/i', $line)) {
$parser->parsevCalendar($buffer, 'VCALENDAR', RCMAIL_CHARSET, false);
$buffer = '';
}
}
fclose($fp);
if ($data = $parser->getComponents()) {
foreach ($data as $comp) {
if ($comp->getType() == 'vEvent') {
$event = $this->_to_rcube_format($comp);
if (!$seen[$event['uid']]++)
$this->events[] = $event;
}
}
}
return $this->events;
}
/**
* Load iCal parser from the Horde lib
*/
private function get_parser()
{
// use Horde:iCalendar to parse vcalendar file format
require_once 'Horde/iCalendar.php';
// set target charset for parsed events
$GLOBALS['_HORDE_STRING_CHARSET'] = RCMAIL_CHARSET;
return new Horde_iCalendar;
}
/**
* Convert the given File_IMC_Parse_Vcalendar_Event object to the internal event format
*/
private function _to_rcube_format($ve)
{
$event = array(
'uid' => $ve->getAttributeDefault('UID'),
'changed' => $ve->getAttributeDefault('DTSTAMP', 0),
'title' => $ve->getAttributeDefault('SUMMARY'),
'start' => $ve->getAttribute('DTSTART'),
'end' => $ve->getAttribute('DTEND'),
// set defaults
'free_busy' => 'busy',
'priority' => 0,
);
// check for all-day dates
if (is_array($event['start'])) {
// create timestamp at 12:00 in user's timezone
$event['start'] = $this->_date2time($event['start']);
$event['allday'] = true;
}
if (is_array($event['end'])) {
$event['end'] = $this->_date2time($event['end']) - 23 * 3600;
}
// map other attributes to internal fields
$_attendees = array();
foreach ($ve->getAllAttributes() as $attr) {
switch ($attr['name']) {
case 'ORGANIZER':
$organizer = array(
'name' => $attr['params']['CN'],
'email' => preg_replace('/^mailto:/i', '', $attr['value']),
'role' => 'ORGANIZER',
'status' => 'ACCEPTED',
);
if (isset($_attendees[$organizer['email']])) {
$i = $_attendees[$organizer['email']];
$event['attendees'][$i]['role'] = $organizer['role'];
}
break;
case 'ATTENDEE':
$attendee = array(
'name' => $attr['params']['CN'],
'email' => preg_replace('/^mailto:/i', '', $attr['value']),
'role' => $attr['params']['ROLE'] ? $attr['params']['ROLE'] : 'REQ-PARTICIPANT',
'status' => $attr['params']['PARTSTAT'],
'rsvp' => $attr['params']['RSVP'] == 'TRUE',
);
if ($organizer && $organizer['email'] == $attendee['email'])
$attendee['role'] = 'ORGANIZER';
$event['attendees'][] = $attendee;
$_attendees[$attendee['email']] = count($event['attendees']) - 1;
break;
case 'TRANSP':
$event['free_busy'] = $attr['value'] == 'TRANSPARENT' ? 'free' : 'busy';
break;
case 'STATUS':
if ($attr['value'] == 'TENTATIVE')
$event['free_busy'] == 'tentative';
break;
case 'PRIORITY':
if (is_numeric($attr['value'])) {
$event['priority'] = $attr['value'];
}
break;
case 'RRULE':
// parse recurrence rule attributes
foreach (explode(';', $attr['value']) as $par) {
list($k, $v) = explode('=', $par);
$params[$k] = $v;
}
if ($params['UNTIL'])
$params['UNTIL'] = $ve->_parseDateTime($params['UNTIL']);
if (!$params['INTERVAL'])
$params['INTERVAL'] = 1;
$event['recurrence'] = $params;
break;
case 'EXDATE':
break;
case 'RECURRENCE-ID':
$event['recurrence_id'] = $this->_date2time($attr['value']);
break;
case 'SEQUENCE':
$event['sequence'] = intval($attr['value']);
break;
case 'DESCRIPTION':
case 'LOCATION':
$event[strtolower($attr['name'])] = $attr['value'];
break;
case 'CLASS':
case 'X-CALENDARSERVER-ACCESS':
$sensitivity_map = array('PUBLIC' => 0, 'PRIVATE' => 1, 'CONFIDENTIAL' => 2);
$event['sensitivity'] = $sensitivity_map[$attr['value']];
break;
case 'X-MICROSOFT-CDO-BUSYSTATUS':
if ($attr['value'] == 'OOF')
$event['free_busy'] == 'outofoffice';
else if (in_array($attr['value'], array('FREE', 'BUSY', 'TENTATIVE')))
$event['free_busy'] = strtolower($attr['value']);
break;
}
}
// find alarms
if ($valarm = $ve->findComponent('valarm')) {
$action = 'DISPLAY';
$trigger = null;
foreach ($valarm->getAllAttributes() as $attr) {
switch ($attr['name']) {
case 'TRIGGER':
if ($attr['params']['VALUE'] == 'DATE-TIME') {
$trigger = '@' . $attr['value'];
}
else {
$trigger = $attr['value'];
$offset = abs($trigger);
$unit = 'S';
if ($offset % 86400 == 0) {
$unit = 'D';
$trigger = intval($trigger / 86400);
}
else if ($offset % 3600 == 0) {
$unit = 'H';
$trigger = intval($trigger / 3600);
}
else if ($offset % 60 == 0) {
$unit = 'M';
$trigger = intval($trigger / 60);
}
}
break;
case 'ACTION':
$action = $attr['value'];
break;
}
}
if ($trigger)
$event['alarms'] = $trigger . $unit . ':' . $action;
}
// add organizer to attendees list if not already present
if ($organizer && !isset($_attendees[$organizer['email']]))
array_unshift($event['attendees'], $organizer);
// make sure the event has an UID
if (!$event['uid'])
$event['uid'] = $this->cal->$this->generate_uid();
return $event;
}
/**
* Helper method to correctly interpret an all-day date value
*/
private function _date2time($prop)
{
// create timestamp at 12:00 in user's timezone
return is_array($prop) ? strtotime(sprintf('%04d%02d%02dT120000%s', $prop['year'], $prop['month'], $prop['mday'], $this->timezone)) : $prop;
}
/**
* Free resources by clearing member vars
*/
public function reset()
{
$this->method = '';
$this->events = array();
}
/**
* Export events to iCalendar format
*
* @param array Events as array
* @param string VCalendar method to advertise
* @param boolean Directly send data to stdout instead of returning
* @return string Events in iCalendar format (http://tools.ietf.org/html/rfc5545)
*/
public function export($events, $method = null, $write = false)
{
$ical = "BEGIN:VCALENDAR" . self::EOL;
$ical .= "VERSION:2.0" . self::EOL;
$ical .= "PRODID:-//Roundcube Webmail " . RCMAIL_VERSION . "//NONSGML Calendar//EN" . self::EOL;
$ical .= "CALSCALE:GREGORIAN" . self::EOL;
if ($method)
$ical .= "METHOD:" . strtoupper($method) . self::EOL;
if ($write) {
echo $ical;
$ical = '';
}
foreach ($events as $event) {
$vevent = "BEGIN:VEVENT" . self::EOL;
$vevent .= "UID:" . self::escpape($event['uid']) . self::EOL;
$vevent .= "DTSTAMP:" . gmdate('Ymd\THis\Z', $event['changed'] ? $event['changed'] : time()) . self::EOL;
// correctly set all-day dates
if ($event['allday']) {
$vevent .= "DTSTART;VALUE=DATE:" . gmdate('Ymd', $event['start'] + $this->cal->gmt_offset) . self::EOL;
$vevent .= "DTEND;VALUE=DATE:" . gmdate('Ymd', $event['end'] + $this->cal->gmt_offset + 86400) . self::EOL; // ends the next day
}
else {
$vevent .= "DTSTART:" . gmdate('Ymd\THis\Z', $event['start']) . self::EOL;
$vevent .= "DTEND:" . gmdate('Ymd\THis\Z', $event['end']) . self::EOL;
}
$vevent .= "SUMMARY:" . self::escpape($event['title']) . self::EOL;
$vevent .= "DESCRIPTION:" . self::escpape($event['description']) . self::EOL;
if (!empty($event['attendees'])){
$vevent .= $this->_get_attendees($event['attendees']);
}
if (!empty($event['location'])) {
$vevent .= "LOCATION:" . self::escpape($event['location']) . self::EOL;
}
if ($event['recurrence']) {
$vevent .= "RRULE:" . calendar::to_rrule($event['recurrence'], self::EOL) . self::EOL;
}
if(!empty($event['categories'])) {
$vevent .= "CATEGORIES:" . self::escpape(strtoupper($event['categories'])) . self::EOL;
}
if ($event['sensitivity'] > 0) {
$vevent .= "CLASS:" . ($event['sensitivity'] == 2 ? 'CONFIDENTIAL' : 'PRIVATE') . self::EOL;
}
if ($event['alarms']) {
list($trigger, $action) = explode(':', $event['alarms']);
$val = calendar::parse_alaram_value($trigger);
$vevent .= "BEGIN:VALARM\n";
if ($val[1]) $vevent .= "TRIGGER:" . preg_replace('/^([-+])(.+)/', '\\1PT\\2', $trigger) . self::EOL;
else $vevent .= "TRIGGER;VALUE=DATE-TIME:" . gmdate('Ymd\THis\Z', $val[0]) . self::EOL;
if ($action) $vevent .= "ACTION:" . self::escpape(strtoupper($action)) . self::EOL;
$vevent .= "END:VALARM\n";
}
$vevent .= "TRANSP:" . ($event['free_busy'] == 'free' ? 'TRANSPARENT' : 'OPAQUE') . self::EOL;
if ($event['priority']) {
$vevent .= "PRIORITY:" . $event['priority'] . self::EOL;
}
if ($event['cancelled'])
$vevent .= "STATUS:CANCELLED" . self::EOL;
else if ($event['free_busy'] == 'tentative')
$vevent .= "STATUS:TENTATIVE" . self::EOL;
// TODO: export attachments
$vevent .= "END:VEVENT" . self::EOL;
if ($write)
echo rcube_vcard::rfc2425_fold($vevent);
else
$ical .= $vevent;
}
$ical .= "END:VCALENDAR" . self::EOL;
if ($write) {
echo $ical;
return true;
}
// fold lines to 75 chars
return rcube_vcard::rfc2425_fold($ical);
}
private function escpape($str)
{
return preg_replace('/(?<!\\\\)([\:\;\,\\n\\r])/', '\\\$1', $str);
}
/**
* Construct the orginizer of the event.
* @param Array Attendees and roles
*
*/
private function _get_attendees($ats)
{
$organizer = "";
$attendees = "";
foreach ($ats as $at) {
if ($at['role']=="ORGANIZER") {
//I am an orginizer
$organizer .= "ORGANIZER;";
if (!empty($at['name']))
$organizer .= 'CN="' . $at['name'] . '"';
$organizer .= ":mailto:". $at['email'] . self::EOL;
}
else {
//I am an attendee
$attendees .= "ATTENDEE;ROLE=" . $at['role'] . ";PARTSTAT=" . $at['status'];
if ($at['rsvp'])
$attendees .= ";RSVP=TRUE";
if (!empty($at['name']))
$attendees .= ';CN="' . $at['name'] . '"';
$attendees .= ":mailto:" . $at['email'] . self::EOL;
}
}
return $organizer . $attendees;
}
}
