calendar/export_execute.php

   1 <?php
   2
   3 require_once('../config.php');
   4 //require_once($CFG->dirroot.'/course/lib.php');
   5 require_once($CFG->dirroot.'/calendar/lib.php');
   6 require_once($CFG->libdir.'/bennu/bennu.inc.php');
   7
   8 $userid = optional_param('userid', 0, PARAM_INT);
   9 $username = optional_param('username', '', PARAM_TEXT);
  10 $authtoken = required_param('authtoken', PARAM_ALPHANUM);
  11 $generateurl = optional_param('generateurl', '', PARAM_TEXT);
  12
  13 if (empty($CFG->enablecalendarexport)) {
  14     die('no export');
  15 }
  16
  17 //Fetch user information
  18 $checkuserid = !empty($userid) && $user = $DB->get_record('user', array('id' => $userid), 'id,password');
  19 //allowing for fallback check of old url - MDL-27542
  20 $checkusername = !empty($username) && $user = $DB->get_record('user', array('username' => $username), 'id,password');
  21 if (!$checkuserid && !$checkusername) {
  22     //No such user
  23     die('Invalid authentication');
  24 }
  25
  26 //Check authentication token
  27 $authuserid = !empty($userid) && $authtoken == sha1($userid . $user->password . $CFG->calendar_exportsalt);
  28 //allowing for fallback check of old url - MDL-27542
  29 $authusername = !empty($username) && $authtoken == sha1($username . $user->password . $CFG->calendar_exportsalt);
  30 if (!$authuserid && !$authusername) {
  31     die('Invalid authentication');
  32 }
  33
  34 // Get the calendar type we are using.
  35 $calendartype = \core_calendar\type_factory::get_calendar_instance();
  36
  37 $what = optional_param('preset_what', 'all', PARAM_ALPHA);
  38 $time = optional_param('preset_time', 'weeknow', PARAM_ALPHA);
  39
  40 $now = $calendartype->timestamp_to_date_array(time());
  41
  42 // Let's see if we have sufficient and correct data
  43 $allowed_what = array('all', 'courses');
  44 $allowed_time = array('weeknow', 'weeknext', 'monthnow', 'monthnext', 'recentupcoming', 'custom');
  45
  46 if (!empty($generateurl)) {
  47     $authtoken = sha1($user->id . $user->password . $CFG->calendar_exportsalt);
  48     $params = array();
  49     $params['preset_what'] = $what;
  50     $params['preset_time'] = $time;
  51     $params['userid'] = $userid;
  52     $params['authtoken'] = $authtoken;
  53     $params['generateurl'] = true;
  54
  55     $link = new moodle_url('/calendar/export.php', $params);
  56     redirect($link->out());
  57     die;
  58 }
  59
  60 if(!empty($what) && !empty($time)) {
  61     if(in_array($what, $allowed_what) && in_array($time, $allowed_time)) {
  62         $courses = enrol_get_users_courses($user->id, true, 'id, visible, shortname');
  63
  64         if ($what == 'all') {
  65             $users = $user->id;
  66             $groups = array();
  67             foreach ($courses as $course) {
  68                 $course_groups = groups_get_all_groups($course->id, $user->id);
  69                 $groups = array_merge($groups, array_keys($course_groups));
  70             }
  71             if (empty($groups)) {
  72                 $groups = false;
  73             }
  74             $courses[SITEID] = new stdClass;
  75             $courses[SITEID]->shortname = get_string('globalevents', 'calendar');
  76         } else {
  77             $users = false;
  78             $groups = false;
  79         }
  80
  81         // Store the number of days in the week.
  82         $numberofdaysinweek = $calendartype->get_num_weekdays();
  83
  84         switch($time) {
  85             case 'weeknow':
  86                 $startweekday = calendar_get_starting_weekday();
  87                 $startmonthday = find_day_in_month($now['mday'] - ($numberofdaysinweek - 1), $startweekday, $now['mon'], $now['year']);
  88                 $startmonth = $now['mon'];
  89                 $startyear = $now['year'];
  90                 if($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
  91                     list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
  92                     $startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
  93                 }
  94                 $gregoriandate = $calendartype->convert_to_gregorian($startyear, $startmonth, $startmonthday);
  95                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
  96                     $gregoriandate['hour'], $gregoriandate['minute']);
  97
  98                 $endmonthday = $startmonthday + $numberofdaysinweek;
  99                 $endmonth = $startmonth;
 100                 $endyear = $startyear;
 101                 if($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
 102                     list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
 103                     $endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
 104                 }
 105                 $gregoriandate = $calendartype->convert_to_gregorian($endyear, $endmonth, $endmonthday);
 106                 $timeend = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 107                     $gregoriandate['hour'], $gregoriandate['minute']);
 108             break;
 109             case 'weeknext':
 110                 $startweekday = calendar_get_starting_weekday();
 111                 $startmonthday = find_day_in_month($now['mday'] + 1, $startweekday, $now['mon'], $now['year']);
 112                 $startmonth = $now['mon'];
 113                 $startyear = $now['year'];
 114                 if($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
 115                     list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
 116                     $startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
 117                 }
 118                 $gregoriandate = $calendartype->convert_to_gregorian($startyear, $startmonth, $startmonthday);
 119                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 120                     $gregoriandate['hour'], $gregoriandate['minute']);
 121
 122                 $endmonthday = $startmonthday + $numberofdaysinweek;
 123                 $endmonth = $startmonth;
 124                 $endyear = $startyear;
 125                 if($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
 126                     list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
 127                     $endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
 128                 }
 129                 $gregoriandate = $calendartype->convert_to_gregorian($endyear, $endmonth, $endmonthday);
 130                 $timeend = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 131                     $gregoriandate['hour'], $gregoriandate['minute']);
 132             break;
 133             case 'monthnow':
 134                 // Convert to gregorian.
 135                 $gregoriandate = $calendartype->convert_to_gregorian($now['year'], $now['mon'], 1);
 136
 137                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 138                     $gregoriandate['hour'], $gregoriandate['minute']);
 139                 $timeend = $timestart + (calendar_days_in_month($now['mon'], $now['year']) * DAYSECS);
 140             break;
 141             case 'monthnext':
 142                 // Get the next month for this calendar.
 143                 list($nextmonth, $nextyear) = calendar_add_month($now['mon'], $now['year']);
 144
 145                 // Convert to gregorian.
 146                 $gregoriandate = $calendartype->convert_to_gregorian($nextyear, $nextmonth, 1);
 147
 148                 // Create the timestamps.
 149                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 150                     $gregoriandate['hour'], $gregoriandate['minute']);
 151                 $timeend = $timestart + (calendar_days_in_month($nextmonth, $nextyear) * DAYSECS);
 152             break;
 153             case 'recentupcoming':
 154                 //Events in the last 5 or next 60 days
 155                 $timestart = time() - 432000;
 156                 $timeend = time() + 5184000;
 157             break;
 158             case 'custom':
 159                 // Events based on custom date range.
 160                 $timestart = time() - $CFG->calendar_exportlookback * DAYSECS;
 161                 $timeend = time() + $CFG->calendar_exportlookahead * DAYSECS;
 162             break;
 163         }
 164     }
 165     else {
 166         // Parameters given but incorrect, redirect back to export page
 167         redirect($CFG->wwwroot.'/calendar/export.php');
 168         die();
 169     }
 170 }
 171 $events = calendar_get_events($timestart, $timeend, $users, $groups, array_keys($courses), false);
 172
 173 $ical = new iCalendar;
 174 $ical->add_property('method', 'PUBLISH');
 175 foreach($events as $event) {
 176    if (!empty($event->modulename)) {
 177         $cm = get_coursemodule_from_instance($event->modulename, $event->instance);
 178         if (!\core_availability\info_module::is_user_visible($cm, $userid, false)) {
 179             continue;
 180         }
 181     }
 182     $hostaddress = str_replace('http://', '', $CFG->wwwroot);
 183     $hostaddress = str_replace('https://', '', $hostaddress);
 184
 185     $ev = new iCalendar_event;
 186     $ev->add_property('uid', $event->id.'@'.$hostaddress);
 187     $ev->add_property('summary', $event->name);
 188     $ev->add_property('description', clean_param($event->description, PARAM_NOTAGS));
 189     $ev->add_property('class', 'PUBLIC'); // PUBLIC / PRIVATE / CONFIDENTIAL
 190     $ev->add_property('last-modified', Bennu::timestamp_to_datetime($event->timemodified));
 191     $ev->add_property('dtstamp', Bennu::timestamp_to_datetime()); // now
 192     if ($event->timeduration > 0) {
 193         //dtend is better than duration, because it works in Microsoft Outlook and works better in Korganizer
 194         $ev->add_property('dtstart', Bennu::timestamp_to_datetime($event->timestart)); // when event starts.
 195         $ev->add_property('dtend', Bennu::timestamp_to_datetime($event->timestart + $event->timeduration));
 196     } else {
 197         // When no duration is present, ie an all day event, VALUE should be date instead of time and dtend = dtstart + 1 day.
 198         $ev->add_property('dtstart', Bennu::timestamp_to_date($event->timestart), array('value' => 'DATE')); // All day event.
 199         $ev->add_property('dtend', Bennu::timestamp_to_date($event->timestart + DAYSECS), array('value' => 'DATE')); // All day event.
 200     }
 201     if ($event->courseid != 0) {
 202         $coursecontext = context_course::instance($event->courseid);
 203         $ev->add_property('categories', format_string($courses[$event->courseid]->shortname, true, array('context' => $coursecontext)));
 204     }
 205     $ical->add_component($ev);
 206 }
 207
 208 $serialized = $ical->serialize();
 209 if(empty($serialized)) {
 210     // TODO
 211     die('bad serialization');
 212 }
 213
 214 $filename = 'icalexport.ics';
 215
 216 header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 217 header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
 218 header('Expires: '. gmdate('D, d M Y H:i:s', 0) .'GMT');
 219 header('Pragma: no-cache');
 220 header('Accept-Ranges: none'); // Comment out if PDFs do not work...
 221 header('Content-disposition: attachment; filename='.$filename);
 222 header('Content-length: '.strlen($serialized));
 223 header('Content-type: text/calendar; charset=utf-8');
 224
 225 echo $serialized;