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 $allowedwhat = ['all', 'user', 'groups', 'courses', 'categories'];
  44 $allowedtime = ['weeknow', 'weeknext', 'monthnow', 'monthnext', 'recentupcoming', 'custom'];
  45
  46 if (!empty($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 $paramcategory = false;
  60 if(!empty($what) && !empty($time)) {
  61     if(in_array($what, $allowedwhat) && in_array($time, $allowedtime)) {
  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             $paramcategory = true;
  82         } else if ($what == 'groups') {
  83             $users = false;
  84             $paramcourses = array();
  85         } else if ($what == 'user') {
  86             $users = $user->id;
  87             $groups = false;
  88             $paramcourses = array();
  89         } else if ($what == 'categories') {
  90             $users = $user->id;
  91             $groups = false;
  92             $paramcourses = array();
  93             $paramcategory = true;
  94         } else {
  95             $users = false;
  96             $groups = false;
  97         }
  98
  99         // Store the number of days in the week.
 100         $numberofdaysinweek = $calendartype->get_num_weekdays();
 101
 102         switch($time) {
 103             case 'weeknow':
 104                 $startweekday = calendar_get_starting_weekday();
 105                 $startmonthday = find_day_in_month($now['mday'] - ($numberofdaysinweek - 1), $startweekday, $now['mon'], $now['year']);
 106                 $startmonth = $now['mon'];
 107                 $startyear = $now['year'];
 108                 if ($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
 109                     list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
 110                     $startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
 111                 }
 112                 $gregoriandate = $calendartype->convert_to_gregorian($startyear, $startmonth, $startmonthday);
 113                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 114                     $gregoriandate['hour'], $gregoriandate['minute']);
 115
 116                 $endmonthday = $startmonthday + $numberofdaysinweek;
 117                 $endmonth = $startmonth;
 118                 $endyear = $startyear;
 119                 if ($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
 120                     list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
 121                     $endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
 122                 }
 123                 $gregoriandate = $calendartype->convert_to_gregorian($endyear, $endmonth, $endmonthday);
 124                 $timeend = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 125                     $gregoriandate['hour'], $gregoriandate['minute']);
 126             break;
 127             case 'weeknext':
 128                 $startweekday = calendar_get_starting_weekday();
 129                 $startmonthday = find_day_in_month($now['mday'] + 1, $startweekday, $now['mon'], $now['year']);
 130                 $startmonth = $now['mon'];
 131                 $startyear = $now['year'];
 132                 if ($startmonthday > calendar_days_in_month($startmonth, $startyear)) {
 133                     list($startmonth, $startyear) = calendar_add_month($startmonth, $startyear);
 134                     $startmonthday = find_day_in_month(1, $startweekday, $startmonth, $startyear);
 135                 }
 136                 $gregoriandate = $calendartype->convert_to_gregorian($startyear, $startmonth, $startmonthday);
 137                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 138                     $gregoriandate['hour'], $gregoriandate['minute']);
 139
 140                 $endmonthday = $startmonthday + $numberofdaysinweek;
 141                 $endmonth = $startmonth;
 142                 $endyear = $startyear;
 143                 if ($endmonthday > calendar_days_in_month($endmonth, $endyear)) {
 144                     list($endmonth, $endyear) = calendar_add_month($endmonth, $endyear);
 145                     $endmonthday = find_day_in_month(1, $startweekday, $endmonth, $endyear);
 146                 }
 147                 $gregoriandate = $calendartype->convert_to_gregorian($endyear, $endmonth, $endmonthday);
 148                 $timeend = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 149                     $gregoriandate['hour'], $gregoriandate['minute']);
 150             break;
 151             case 'monthnow':
 152                 // Convert to gregorian.
 153                 $gregoriandate = $calendartype->convert_to_gregorian($now['year'], $now['mon'], 1);
 154
 155                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 156                     $gregoriandate['hour'], $gregoriandate['minute']);
 157                 $timeend = $timestart + (calendar_days_in_month($now['mon'], $now['year']) * DAYSECS);
 158             break;
 159             case 'monthnext':
 160                 // Get the next month for this calendar.
 161                 list($nextmonth, $nextyear) = calendar_add_month($now['mon'], $now['year']);
 162
 163                 // Convert to gregorian.
 164                 $gregoriandate = $calendartype->convert_to_gregorian($nextyear, $nextmonth, 1);
 165
 166                 // Create the timestamps.
 167                 $timestart = make_timestamp($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 168                     $gregoriandate['hour'], $gregoriandate['minute']);
 169                 $timeend = $timestart + (calendar_days_in_month($nextmonth, $nextyear) * DAYSECS);
 170             break;
 171             case 'recentupcoming':
 172                 //Events in the last 5 or next 60 days
 173                 $timestart = time() - 432000;
 174                 $timeend = time() + 5184000;
 175             break;
 176             case 'custom':
 177                 // Events based on custom date range.
 178                 $timestart = time() - $CFG->calendar_exportlookback * DAYSECS;
 179                 $timeend = time() + $CFG->calendar_exportlookahead * DAYSECS;
 180             break;
 181         }
 182     }
 183     else {
 184         // Parameters given but incorrect, redirect back to export page
 185         redirect($CFG->wwwroot.'/calendar/export.php');
 186         die();
 187     }
 188 }
 189 $limitnum = 0;
 190 $events = calendar_get_legacy_events($timestart, $timeend, $users, $groups, array_keys($paramcourses), false, true,
 191         $paramcategory, $limitnum);
 192
 193 $ical = new iCalendar;
 194 $ical->add_property('method', 'PUBLISH');
 195 $ical->add_property('prodid', '-//Moodle Pty Ltd//NONSGML Moodle Version ' . $CFG->version . '//EN');
 196 foreach($events as $event) {
 197     if (!empty($event->modulename)) {
 198         $instances = get_fast_modinfo($event->courseid, $userid)->get_instances_of($event->modulename);
 199         if (empty($instances[$event->instance]->uservisible)) {
 200             continue;
 201         }
 202     }
 203     $hostaddress = str_replace('http://', '', $CFG->wwwroot);
 204     $hostaddress = str_replace('https://', '', $hostaddress);
 205
 206     $me = new calendar_event($event); // To use moodle calendar event services.
 207     $ev = new iCalendar_event; // To export in ical format.
 208     $ev->add_property('uid', $event->id.'@'.$hostaddress);
 209
 210     // Set iCal event summary from event name.
 211     $ev->add_property('summary', format_string($event->name, true, ['context' => $me->context]));
 212
 213     // Format the description text.
 214     $description = format_text($me->description, $me->format, ['context' => $me->context]);
 215     // Then convert it to plain text, since it's the only format allowed for the event description property.
 216     // We use html_to_text in order to convert <br> and <p> tags to new line characters for descriptions in HTML format.
 217     $description = html_to_text($description, 0);
 218     $ev->add_property('description', $description);
 219
 220     $ev->add_property('class', 'PUBLIC'); // PUBLIC / PRIVATE / CONFIDENTIAL
 221     $ev->add_property('last-modified', Bennu::timestamp_to_datetime($event->timemodified));
 222
 223     if (!empty($event->location)) {
 224         $ev->add_property('location', $event->location);
 225     }
 226
 227     $ev->add_property('dtstamp', Bennu::timestamp_to_datetime()); // now
 228     if ($event->timeduration > 0) {
 229         //dtend is better than duration, because it works in Microsoft Outlook and works better in Korganizer
 230         $ev->add_property('dtstart', Bennu::timestamp_to_datetime($event->timestart)); // when event starts.
 231         $ev->add_property('dtend', Bennu::timestamp_to_datetime($event->timestart + $event->timeduration));
 232     } else if ($event->timeduration == 0) {
 233         // When no duration is present, the event is instantaneous event, ex - Due date of a module.
 234         // Moodle doesn't support all day events yet. See MDL-56227.
 235         $ev->add_property('dtstart', Bennu::timestamp_to_datetime($event->timestart));
 236         $ev->add_property('dtend', Bennu::timestamp_to_datetime($event->timestart));
 237     } else {
 238         // This can be used to represent all day events in future.
 239         throw new coding_exception("Negative duration is not supported yet.");
 240     }
 241     if ($event->courseid != 0) {
 242         $coursecontext = context_course::instance($event->courseid);
 243         $ev->add_property('categories', format_string($courses[$event->courseid]->shortname, true, array('context' => $coursecontext)));
 244     }
 245     $ical->add_component($ev);
 246 }
 247
 248 $serialized = $ical->serialize();
 249 if(empty($serialized)) {
 250     // TODO
 251     die('bad serialization');
 252 }
 253
 254 $filename = 'icalexport.ics';
 255
 256 header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 257 header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
 258 header('Expires: '. gmdate('D, d M Y H:i:s', 0) .'GMT');
 259 header('Pragma: no-cache');
 260 header('Accept-Ranges: none'); // Comment out if PDFs do not work...
 261 header('Content-disposition: attachment; filename='.$filename);
 262 header('Content-length: '.strlen($serialized));
 263 header('Content-type: text/calendar; charset=utf-8');
 264
 265 echo $serialized;