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', 'user', 'groups', '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         // Array of courses that we will pass to calendar_get_legacy_events() which
  64         // is initially set to the list of the user's courses.
  65         $paramcourses = $courses;
  66         if ($what == 'all' || $what == 'groups') {
  67             $groups = array();
  68             foreach ($courses as $course) {
  69                 $course_groups = groups_get_all_groups($course->id, $user->id);
  70                 $groups = array_merge($groups, array_keys($course_groups));
  71             }
  72             if (empty($groups)) {
  73                 $groups = false;
  74             }
  75         }
  76         if ($what == 'all') {
  77             $users = $user->id;
  78             $courses[SITEID] = new stdClass;
  79             $courses[SITEID]->shortname = get_string('globalevents', 'calendar');
  80             $paramcourses[SITEID] = $courses[SITEID];
  81         } else if ($what == 'groups') {
  82             $users = false;
  83             $paramcourses = array();
  84         } else if ($what == 'user') {
  85             $users = $user->id;
  86             $groups = false;
  87             $paramcourses = array();
  88         } else {
  89             $users = false;
  90             $groups = false;
  91         }
  92
  93         // Store the number of days in the week.
  94         $numberofdaysinweek = $calendartype->get_num_weekdays();
  95
  96         switch($time) {
  97             case 'weeknow':
  98                 $startweekday = calendar_get_starting_weekday();
  99                 $startmonthday = find_day_in_month($now['mday'] - ($numberofdaysinweek - 1), $startweekday, $now['mon'], $now['year']);
 100                 $startmonth = $now['mon'];
 101                 $startyear = $now['year'];
 102                 if ($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
 103                     list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
 104                     $startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
 105                 }
 106                 $gregoriandate = $calendartype->convert_to_gregorian($startyear, $startmonth, $startmonthday);
 107                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 108                     $gregoriandate['hour'], $gregoriandate['minute']);
 109
 110                 $endmonthday = $startmonthday + $numberofdaysinweek;
 111                 $endmonth = $startmonth;
 112                 $endyear = $startyear;
 113                 if ($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
 114                     list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
 115                     $endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
 116                 }
 117                 $gregoriandate = $calendartype->convert_to_gregorian($endyear, $endmonth, $endmonthday);
 118                 $timeend = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 119                     $gregoriandate['hour'], $gregoriandate['minute']);
 120             break;
 121             case 'weeknext':
 122                 $startweekday = calendar_get_starting_weekday();
 123                 $startmonthday = find_day_in_month($now['mday'] + 1, $startweekday, $now['mon'], $now['year']);
 124                 $startmonth = $now['mon'];
 125                 $startyear = $now['year'];
 126                 if ($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
 127                     list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
 128                     $startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
 129                 }
 130                 $gregoriandate = $calendartype->convert_to_gregorian($startyear, $startmonth, $startmonthday);
 131                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 132                     $gregoriandate['hour'], $gregoriandate['minute']);
 133
 134                 $endmonthday = $startmonthday + $numberofdaysinweek;
 135                 $endmonth = $startmonth;
 136                 $endyear = $startyear;
 137                 if ($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
 138                     list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
 139                     $endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
 140                 }
 141                 $gregoriandate = $calendartype->convert_to_gregorian($endyear, $endmonth, $endmonthday);
 142                 $timeend = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 143                     $gregoriandate['hour'], $gregoriandate['minute']);
 144             break;
 145             case 'monthnow':
 146                 // Convert to gregorian.
 147                 $gregoriandate = $calendartype->convert_to_gregorian($now['year'], $now['mon'], 1);
 148
 149                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 150                     $gregoriandate['hour'], $gregoriandate['minute']);
 151                 $timeend = $timestart + (calendar_days_in_month($now['mon'], $now['year']) * DAYSECS);
 152             break;
 153             case 'monthnext':
 154                 // Get the next month for this calendar.
 155                 list($nextmonth, $nextyear) = calendar_add_month($now['mon'], $now['year']);
 156
 157                 // Convert to gregorian.
 158                 $gregoriandate = $calendartype->convert_to_gregorian($nextyear, $nextmonth, 1);
 159
 160                 // Create the timestamps.
 161                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 162                     $gregoriandate['hour'], $gregoriandate['minute']);
 163                 $timeend = $timestart + (calendar_days_in_month($nextmonth, $nextyear) * DAYSECS);
 164             break;
 165             case 'recentupcoming':
 166                 //Events in the last 5 or next 60 days
 167                 $timestart = time() - 432000;
 168                 $timeend = time() + 5184000;
 169             break;
 170             case 'custom':
 171                 // Events based on custom date range.
 172                 $timestart = time() - $CFG->calendar_exportlookback * DAYSECS;
 173                 $timeend = time() + $CFG->calendar_exportlookahead * DAYSECS;
 174             break;
 175         }
 176     }
 177     else {
 178         // Parameters given but incorrect, redirect back to export page
 179         redirect($CFG->wwwroot.'/calendar/export.php');
 180         die();
 181     }
 182 }
 183 $events = calendar_get_legacy_events($timestart, $timeend, $users, $groups, array_keys($paramcourses), false);
 184
 185 $ical = new iCalendar;
 186 $ical->add_property('method', 'PUBLISH');
 187 $ical->add_property('prodid', '-//Moodle Pty Ltd//NONSGML Moodle Version ' . $CFG->version . '//EN');
 188 foreach($events as $event) {
 189     if (!empty($event->modulename)) {
 190         $instances = get_fast_modinfo($event->courseid, $userid)->get_instances_of($event->modulename);
 191         if (empty($instances[$event->instance]->uservisible)) {
 192             continue;
 193         }
 194     }
 195     $hostaddress = str_replace('http://', '', $CFG->wwwroot);
 196     $hostaddress = str_replace('https://', '', $hostaddress);
 197
 198     $me = new calendar_event($event); // To use moodle calendar event services.
 199     $ev = new iCalendar_event; // To export in ical format.
 200     $ev->add_property('uid', $event->id.'@'.$hostaddress);
 201
 202     // Set iCal event summary from event name.
 203     $ev->add_property('summary', format_string($event->name, true, ['context' => $me->context]));
 204
 205     // Format the description text.
 206     $description = format_text($me->description, $me->format, ['context' => $me->context]);
 207     // Then convert it to plain text, since it's the only format allowed for the event description property.
 208     // We use html_to_text in order to convert <br> and <p> tags to new line characters for descriptions in HTML format.
 209     $description = html_to_text($description, 0);
 210     $ev->add_property('description', $description);
 211
 212     $ev->add_property('class', 'PUBLIC'); // PUBLIC / PRIVATE / CONFIDENTIAL
 213     $ev->add_property('last-modified', Bennu::timestamp_to_datetime($event->timemodified));
 214     $ev->add_property('dtstamp', Bennu::timestamp_to_datetime()); // now
 215     if ($event->timeduration > 0) {
 216         //dtend is better than duration, because it works in Microsoft Outlook and works better in Korganizer
 217         $ev->add_property('dtstart', Bennu::timestamp_to_datetime($event->timestart)); // when event starts.
 218         $ev->add_property('dtend', Bennu::timestamp_to_datetime($event->timestart + $event->timeduration));
 219     } else if ($event->timeduration == 0) {
 220         // When no duration is present, the event is instantaneous event, ex - Due date of a module.
 221         // Moodle doesn't support all day events yet. See MDL-56227.
 222         $ev->add_property('dtstart', Bennu::timestamp_to_datetime($event->timestart));
 223         $ev->add_property('dtend', Bennu::timestamp_to_datetime($event->timestart));
 224     } else {
 225         // This can be used to represent all day events in future.
 226         throw new coding_exception("Negative duration is not supported yet.");
 227     }
 228     if ($event->courseid != 0) {
 229         $coursecontext = context_course::instance($event->courseid);
 230         $ev->add_property('categories', format_string($courses[$event->courseid]->shortname, true, array('context' => $coursecontext)));
 231     }
 232     $ical->add_component($ev);
 233 }
 234
 235 $serialized = $ical->serialize();
 236 if(empty($serialized)) {
 237     // TODO
 238     die('bad serialization');
 239 }
 240
 241 $filename = 'icalexport.ics';
 242
 243 header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 244 header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
 245 header('Expires: '. gmdate('D, d M Y H:i:s', 0) .'GMT');
 246 header('Pragma: no-cache');
 247 header('Accept-Ranges: none'); // Comment out if PDFs do not work...
 248 header('Content-disposition: attachment; filename='.$filename);
 249 header('Content-length: '.strlen($serialized));
 250 header('Content-type: text/calendar; charset=utf-8');
 251
 252 echo $serialized;