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<?php
require_once('../config.php');
//require_once($CFG->dirroot.'/course/lib.php');
require_once($CFG->dirroot.'/calendar/lib.php');
require_once($CFG->libdir.'/bennu/bennu.inc.php');
$userid = optional_param('userid', 0, PARAM_INT);
$username = optional_param('username', '', PARAM_TEXT);
$authtoken = required_param('authtoken', PARAM_ALPHANUM);
$generateurl = optional_param('generateurl', '', PARAM_TEXT);
if (empty($CFG->enablecalendarexport)) {
die('no export');
}
//Fetch user information
$checkuserid = !empty($userid) && $user = $DB->get_record('user', array('id' => $userid), 'id,password');
//allowing for fallback check of old url - MDL-27542
$checkusername = !empty($username) && $user = $DB->get_record('user', array('username' => $username), 'id,password');
if (!$checkuserid && !$checkusername) {
//No such user
die('Invalid authentication');
}
//Check authentication token
$authuserid = !empty($userid) && $authtoken == sha1($userid . $user->password . $CFG->calendar_exportsalt);
//allowing for fallback check of old url - MDL-27542
$authusername = !empty($username) && $authtoken == sha1($username . $user->password . $CFG->calendar_exportsalt);
if (!$authuserid && !$authusername) {
die('Invalid authentication');
}
$what = optional_param('preset_what', 'all', PARAM_ALPHA);
$time = optional_param('preset_time', 'weeknow', PARAM_ALPHA);
$now = usergetdate(time());
// Let's see if we have sufficient and correct data
$allowed_what = array('all', 'courses');
$allowed_time = array('weeknow', 'weeknext', 'monthnow', 'monthnext', 'recentupcoming');
if (!empty($generateurl)) {
$authtoken = sha1($user->id . $user->password . $CFG->calendar_exportsalt);
$params = array();
$params['preset_what'] = $what;
$params['preset_time'] = $time;
$params['userid'] = $userid;
$params['authtoken'] = $authtoken;
$params['generateurl'] = true;
$link = new moodle_url('/calendar/export.php', $params);
redirect($link->out());
die;
}
if(!empty($what) && !empty($time)) {
if(in_array($what, $allowed_what) && in_array($time, $allowed_time)) {
$courses = enrol_get_users_courses($user->id, true, 'id, visible, shortname');
if ($what == 'all') {
$users = $user->id;
$groups = array();
foreach ($courses as $course) {
$course_groups = groups_get_all_groups($course->id, $user->id);
$groups = array_merge($groups, array_keys($course_groups));
}
if (empty($groups)) {
$groups = false;
}
$courses[SITEID] = new stdClass;
$courses[SITEID]->shortname = get_string('globalevents', 'calendar');
} else {
$users = false;
$groups = false;
}
switch($time) {
case 'weeknow':
$startweekday = get_user_preferences('calendar_startwday', calendar_get_starting_weekday());
$startmonthday = find_day_in_month($now['mday'] - 6, $startweekday, $now['mon'], $now['year']);
$startmonth = $now['mon'];
$startyear = $now['year'];
if($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
$startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
}
$timestart = make_timestamp($startyear, $startmonth, $startmonthday);
$endmonthday = $startmonthday + 7;
$endmonth = $startmonth;
$endyear = $startyear;
if($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
$endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
}
$timeend = make_timestamp($endyear, $endmonth, $endmonthday) - 1;
break;
case 'weeknext':
$startweekday = get_user_preferences('calendar_startwday', calendar_get_starting_weekday());
$startmonthday = find_day_in_month($now['mday'] + 1, $startweekday, $now['mon'], $now['year']);
$startmonth = $now['mon'];
$startyear = $now['year'];
if($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
$startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
}
$timestart = make_timestamp($startyear, $startmonth, $startmonthday);
$endmonthday = $startmonthday + 7;
$endmonth = $startmonth;
$endyear = $startyear;
if($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
$endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
}
$timeend = make_timestamp($endyear, $endmonth, $endmonthday) - 1;
break;
case 'monthnow':
$timestart = make_timestamp($now['year'], $now['mon'], 1);
$timeend = make_timestamp($now['year'], $now['mon'], calendar_days_in_month($now['mon'], $now['year']), 23, 59, 59);
break;
case 'monthnext':
list($nextmonth, $nextyear) = calendar_add_month($now['mon'], $now['year']);
$timestart = make_timestamp($nextyear, $nextmonth, 1);
$timeend = make_timestamp($nextyear, $nextmonth, calendar_days_in_month($nextmonth, $nextyear), 23, 59, 59);
break;
case 'recentupcoming':
//Events in the last 5 or next 60 days
$timestart = time() - 432000;
$timeend = time() + 5184000;
break;
}
}
else {
// Parameters given but incorrect, redirect back to export page
redirect($CFG->wwwroot.'/calendar/export.php');
die();
}
}
$events = calendar_get_events($timestart, $timeend, $users, $groups, array_keys($courses), false);
$ical = new iCalendar;
$ical->add_property('method', 'PUBLISH');
foreach($events as $event) {
if (!empty($event->modulename)) {
$cm = get_coursemodule_from_instance($event->modulename, $event->instance);
if (!groups_course_module_visible($cm)) {
continue;
}
}
$hostaddress = str_replace('http://', '', $CFG->wwwroot);
$hostaddress = str_replace('https://', '', $hostaddress);
$ev = new iCalendar_event;
$ev->add_property('uid', $event->id.'@'.$hostaddress);
$ev->add_property('summary', $event->name);
$ev->add_property('description', clean_param($event->description, PARAM_NOTAGS));
$ev->add_property('class', 'PUBLIC'); // PUBLIC / PRIVATE / CONFIDENTIAL
$ev->add_property('last-modified', Bennu::timestamp_to_datetime($event->timemodified));
$ev->add_property('dtstamp', Bennu::timestamp_to_datetime()); // now
$ev->add_property('dtstart', Bennu::timestamp_to_datetime($event->timestart)); // when event starts
if ($event->timeduration > 0) {
//dtend is better than duration, because it works in Microsoft Outlook and works better in Korganizer
$ev->add_property('dtend', Bennu::timestamp_to_datetime($event->timestart + $event->timeduration));
}
if ($event->courseid != 0) {
$coursecontext = get_context_instance(CONTEXT_COURSE, $event->courseid);
$ev->add_property('categories', format_string($courses[$event->courseid]->shortname, true, array('context' => $coursecontext)));
}
$ical->add_component($ev);
}
$serialized = $ical->serialize();
if(empty($serialized)) {
// TODO
die('bad serialization');
}
//IE compatibility HACK!
if (ini_get_bool('zlib.output_compression')) {
ini_set('zlib.output_compression', 'Off');
}
$filename = 'icalexport.ics';
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
header('Expires: '. gmdate('D, d M Y H:i:s', 0) .'GMT');
header('Pragma: no-cache');
header('Accept-Ranges: none'); // Comment out if PDFs do not work...
header('Content-disposition: attachment; filename='.$filename);
header('Content-length: '.strlen($serialized));
header('Content-type: text/calendar; charset=utf-8');
echo $serialized;
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