calendar/event.php

   1 <?php // $Id$
   2
   3 /////////////////////////////////////////////////////////////////////////////
   4 //                                                                         //
   5 // NOTICE OF COPYRIGHT                                                     //
   6 //                                                                         //
   7 // Moodle - Calendar extension                                             //
   8 //                                                                         //
   9 // Copyright (C) 2003-2004  Greek School Network            www.sch.gr     //
  10 //                                                                         //
  11 // Designed by:                                                            //
  12 //     Avgoustos Tsinakos (tsinakos@uom.gr)                                //
  13 //     Jon Papaioannou (pj@uom.gr)                                         //
  14 //                                                                         //
  15 // Programming and development:                                            //
  16 //     Jon Papaioannou (pj@uom.gr)                                         //
  17 //                                                                         //
  18 // For bugs, suggestions, etc contact:                                     //
  19 //     Jon Papaioannou (pj@uom.gr)                                         //
  20 //                                                                         //
  21 // The current module was developed at the University of Macedonia         //
  22 // (www.uom.gr) under the funding of the Greek School Network (www.sch.gr) //
  23 // The aim of this project is to provide additional and improved           //
  24 // functionality to the Asynchronous Distance Education service that the   //
  25 // Greek School Network deploys.                                           //
  26 //                                                                         //
  27 // This program is free software; you can redistribute it and/or modify    //
  28 // it under the terms of the GNU General Public License as published by    //
  29 // the Free Software Foundation; either version 2 of the License, or       //
  30 // (at your option) any later version.                                     //
  31 //                                                                         //
  32 // This program is distributed in the hope that it will be useful,         //
  33 // but WITHOUT ANY WARRANTY; without even the implied warranty of          //
  34 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           //
  35 // GNU General Public License for more details:                            //
  36 //                                                                         //
  37 //          http://www.gnu.org/copyleft/gpl.html                           //
  38 //                                                                         //
  39 /////////////////////////////////////////////////////////////////////////////
  40
  41     require_once('../config.php');
  42     require_once($CFG->dirroot.'/calendar/lib.php');
  43     require_once($CFG->dirroot.'/course/lib.php');
  44     require_once($CFG->dirroot.'/mod/forum/lib.php');
  45
  46     require_login();
  47
  48     if(isguest()) {
  49         // Guests cannot do anything with events
  50         redirect(CALENDAR_URL.'view.php?view=upcoming');
  51     }
  52
  53     $action    = required_param('action', PARAM_ALPHA);
  54     $eventid   = optional_param('id', 0, PARAM_INT);
  55     $eventtype = optional_param('type', 'select', PARAM_ALPHA);
  56     $urlcourse = optional_param('course', 0, PARAM_INT);
  57
  58     if(!$site = get_site()) {
  59         redirect($CFG->wwwroot.'/'.$CFG->admin.'/index.php');
  60     }
  61
  62     $strcalendar = get_string('calendar', 'calendar');
  63
  64     $now = usergetdate(time());
  65     $nav = calendar_get_link_tag($strcalendar, CALENDAR_URL.'view.php?view=upcoming&amp;', $now['mday'], $now['mon'], $now['year']);
  66     $day = intval($now['mday']);
  67     $mon = intval($now['mon']);
  68     $yr = intval($now['year']);
  69
  70     if ($usehtmleditor = can_use_richtext_editor()) {
  71         $defaultformat = FORMAT_HTML;
  72     } else {
  73         $defaultformat = FORMAT_MOODLE;
  74     }
  75
  76     // If a course has been supplied in the URL, change the filters to show that one
  77     if($urlcourse > 0 && record_exists('course', 'id', $urlcourse)) {
  78         if($urlcourse == SITEID) {
  79             // If coming from the site page, show all courses
  80             $SESSION->cal_courses_shown = calendar_get_default_courses(true);
  81             calendar_set_referring_course(0);
  82         }
  83         else {
  84             // Otherwise show just this one
  85             $SESSION->cal_courses_shown = $urlcourse;
  86             calendar_set_referring_course($SESSION->cal_courses_shown);
  87         }
  88     }
  89
  90     switch($action) {
  91         case 'delete':
  92             $title = get_string('deleteevent', 'calendar');
  93             $event = get_record('event', 'id', $eventid);
  94             if($event === false) {
  95                 error('Invalid event');
  96             }
  97             if(!calendar_edit_event_allowed($event)) {
  98                 error('You are not authorized to do this');
  99             }
 100         break;
 101
 102         case 'edit':
 103             $title = get_string('editevent', 'calendar');
 104             $event = get_record('event', 'id', $eventid);
 105             $repeats = optional_param('repeats', 0, PARAM_INT);
 106
 107             if($event === false) {
 108                 error('Invalid event');
 109             }
 110             if(!calendar_edit_event_allowed($event)) {
 111                 error('You are not authorized to do this');
 112             }
 113
 114             if($form = data_submitted()) {
 115
 116                 $form->name = strip_tags($form->name,'<lang>');  // Strip all tags, but <lang>
 117
 118                 $form->timestart = make_timestamp($form->startyr, $form->startmon, $form->startday, $form->starthr, $form->startmin);
 119                 if($form->duration == 1) {
 120                     $form->timeduration = make_timestamp($form->endyr, $form->endmon, $form->endday, $form->endhr, $form->endmin) - $form->timestart;
 121                     if($form->timeduration < 0) {
 122                         $form->timeduration = 0;
 123                     }
 124                 }
 125                 else if($form->duration == 2) {
 126                     $form->timeduration = $form->minutes * MINSECS;
 127                 }
 128                 else {
 129                     $form->timeduration = 0;
 130                 }
 131
 132                 validate_form($form, $err);
 133
 134                 if (count($err) == 0) {
 135
 136                     if($event->repeatid && $repeats) {
 137                         // Update all
 138                         if($form->timestart >= $event->timestart) {
 139                             $timestartoffset = 'timestart + '.($form->timestart - $event->timestart);
 140                         }
 141                         else {
 142                             $timestartoffset = 'timestart - '.($event->timestart - $form->timestart);
 143                         }
 144
 145                         execute_sql('UPDATE '.$CFG->prefix.'event SET '.
 146                             'name = '.$db->qstr($form->name).','.
 147                             'description = '.$db->qstr($form->description).','.
 148                             'timestart = '.$timestartoffset.','.
 149                             'timeduration = '.$form->timeduration.','.
 150                             'timemodified = '.time().' WHERE repeatid = '.$event->repeatid);
 151
 152                         /// Log the event update.
 153                         $form->name = stripslashes($form->name);  //To avoid double-slashes
 154                         add_to_log($form->courseid, 'calendar', 'edit all', 'event.php?action=edit&amp;id='.$form->id, $form->name);
 155                     }
 156
 157                     else {
 158                         // Update this
 159                         $form->timemodified = time();
 160                         update_record('event', $form);
 161
 162                         /// Log the event update.
 163                         $form->name = stripslashes($form->name);  //To avoid double-slashes
 164                         add_to_log($form->courseid, 'calendar', 'edit', 'event.php?action=edit&amp;id='.$form->id, $form->name);
 165                     }
 166
 167                     // OK, now redirect to day view
 168                     redirect(CALENDAR_URL.'view.php?view=day&cal_d='.$form->startday.'&cal_m='.$form->startmon.'&cal_y='.$form->startyr);
 169                 }
 170                 else {
 171                     foreach ($err as $key => $value) {
 172                         $focus = 'form.'.$key;
 173                     }
 174                 }
 175             }
 176         break;
 177
 178         case 'new':
 179             $title = get_string('newevent', 'calendar');
 180             $form = data_submitted();
 181             if(!empty($form) && $form->type == 'defined') {
 182
 183                 $form->name = strip_tags($form->name, '<lang>');  // Strip all tags but <lang>
 184
 185                 $form->timestart = make_timestamp($form->startyr, $form->startmon, $form->startday, $form->starthr, $form->startmin);
 186                 if($form->duration == 1) {
 187                     $form->timeduration = make_timestamp($form->endyr, $form->endmon, $form->endday, $form->endhr, $form->endmin) - $form->timestart;
 188                     if($form->timeduration < 0) {
 189                         $form->timeduration = 0;
 190                     }
 191                 }
 192                 else if ($form->duration == 2) {
 193                     $form->timeduration = $form->minutes * MINSECS;
 194                 }
 195                 else {
 196                     $form->timeduration = 0;
 197                 }
 198                 if(!calendar_add_event_allowed($form->courseid, $form->groupid, $form->userid)) {
 199                     error('You are not authorized to do this');
 200                 }
 201                 validate_form($form, $err);
 202                 if (count($err) == 0) {
 203                     $form->timemodified = time();
 204
 205                     if ($form->repeat) {
 206                         $fetch = get_record_sql('SELECT 1, MAX(repeatid) AS repeatid FROM '.$CFG->prefix.'event');
 207                         $form->repeatid = empty($fetch) ? 1 : $fetch->repeatid + 1;
 208                     }
 209
 210                     /// Get the event id for the log record.
 211                     $eventid = insert_record('event', $form, true);
 212
 213                     /// Log the event entry.
 214                     $form->name = stripslashes($form->name);  //To avoid double-slashes
 215                     add_to_log($form->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$eventid, $form->name);
 216
 217                     if ($form->repeat) {
 218                         for($i = 1; $i < $form->repeats; $i++) {
 219                             // [pj]
 220                             // This will not necessarily work correctly because of DST
 221                             $form->timestart += 604800;  // add one week
 222                             /// Get the event id for the log record.
 223                             $eventid = insert_record('event', $form, true);
 224                             /// Log the event entry.
 225                             $form->name = stripslashes($form->name);  //To avoid double-slashes
 226                             add_to_log($form->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$eventid, $form->name);
 227                         }
 228                     }
 229
 230                     // OK, now redirect to day view
 231                     redirect(CALENDAR_URL.'view.php?view=day&cal_d='.$form->startday.'&cal_m='.$form->startmon.'&cal_y='.$form->startyr);
 232                 }
 233                 else {
 234                     foreach ($err as $key => $value) {
 235                         $focus = 'form.'.$key;
 236                     }
 237                 }
 238             }
 239         break;
 240     }
 241     if(empty($focus)) $focus = '';
 242
 243     // Let's see if we are supposed to provide a referring course link
 244     // but NOT for the "main page" course
 245     if($SESSION->cal_course_referer != SITEID &&
 246       ($shortname = get_field('course', 'shortname', 'id', $SESSION->cal_course_referer)) !== false) {
 247         // If we know about the referring course, show a return link
 248         $nav = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$SESSION->cal_course_referer.'">'.$shortname.'</a> -> '.$nav;
 249     }
 250
 251     if (!empty($SESSION->cal_course_referer)) {
 252         // TODO: This is part of the Great $course Hack in Moodle. Replace it at some point.
 253         $course = get_record('course', 'id', $SESSION->cal_course_referer);
 254     } else {
 255         $course = $site;
 256     }
 257
 258     print_header($site->shortname.': '.$strcalendar.': '.$title, $strcalendar, $nav.' -> '.$title,
 259                  $focus, '', true, '', user_login_string($site));
 260
 261     echo calendar_overlib_html();
 262
 263     echo '<table id="calendar">';
 264     echo '<tr><td class="maincalendar">';
 265
 266     switch($action) {
 267         case 'delete':
 268             $confirm = optional_param('confirm', 0, PARAM_INT);
 269             $repeats = optional_param('repeats', 0, PARAM_INT);
 270             if($confirm) {
 271                 // Kill it and redirect to day view
 272                 if(($event = get_record('event', 'id', $eventid)) !== false) {
 273
 274                     if($event->repeatid && $repeats) {
 275                         delete_records('event', 'repeatid', $event->repeatid);
 276                         add_to_log($event->courseid, 'calendar', 'delete all', '', $event->name);
 277                     }
 278                     else {
 279                         delete_records('event', 'id', $eventid);
 280                         add_to_log($event->courseid, 'calendar', 'delete', '', $event->name);
 281                     }
 282                 }
 283
 284                 redirect(CALENDAR_URL.'view.php?view=day&cal_d='.$_REQUEST['d'].'&cal_m='.$_REQUEST['m'].'&cal_y='.$_REQUEST['y']);
 285
 286             }
 287             else {
 288                 $eventtime = usergetdate($event->timestart);
 289                 $m = $eventtime['mon'];
 290                 $d = $eventtime['mday'];
 291                 $y = $eventtime['year'];
 292
 293                 if($event->repeatid) {
 294                     $fetch = get_record_sql('SELECT 1, COUNT(id) AS repeatcount FROM '.$CFG->prefix.'event WHERE repeatid = '.$event->repeatid);
 295                     $repeatcount = $fetch->repeatcount;
 296                 }
 297                 else {
 298                     $repeatcount = 0;
 299                 }
 300
 301                 // Display confirmation form
 302                 echo '<div class="header">'.get_string('deleteevent', 'calendar').': '.$event->name.'</div>';
 303                 echo '<h2>'.get_string('confirmeventdelete', 'calendar').'</h2>';
 304                 if($repeatcount > 1) {
 305                     echo '<p>'.get_string('youcandeleteallrepeats', 'calendar', $repeatcount).'</p>';
 306                 }
 307                 echo '<div class="eventlist">';
 308                 $event->time = calendar_format_event_time($event, time(), '', false);
 309                 calendar_print_event($event);
 310                 echo '</div>';
 311                 include('event_delete.html');
 312             }
 313         break;
 314
 315         case 'edit':
 316             if(empty($form)) {
 317                 $form->name = $event->name;
 318                 $form->courseid = $event->courseid; // Not to update, but for date validation
 319                 $form->description = $event->description;
 320                 $form->timestart = $event->timestart;
 321                 $form->timeduration = $event->timeduration;
 322                 $form->id = $event->id;
 323                 $form->format = $defaultformat;
 324                 if($event->timeduration > HOURSECS) {
 325                     // More than one hour, so default to normal duration mode
 326                     $form->duration = 1;
 327                     $form->minutes = '';
 328                 }
 329                 else if($event->timeduration) {
 330                     // Up to one hour, "minutes" mode probably is better here
 331                     $form->duration = 2;
 332                     $form->minutes = $event->timeduration / MINSECS;
 333                 }
 334                 else {
 335                     // No duration
 336                     $form->duration = 0;
 337                     $form->minutes = '';
 338                 }
 339             }
 340
 341             if (!empty($form->courseid)) {
 342                 // TODO: This is part of the Great $course Hack in Moodle. Replace it at some point.
 343                 $course = get_record('course', 'id', $form->courseid);
 344             } else {
 345                 $course = $site;
 346             }
 347
 348             if($event->repeatid) {
 349                 $fetch = get_record_sql('SELECT 1, COUNT(id) AS repeatcount FROM '.$CFG->prefix.'event WHERE repeatid = '.$event->repeatid);
 350                 $repeatcount = $fetch->repeatcount;
 351             }
 352             else {
 353                 $repeatcount = 0;
 354             }
 355
 356             echo '<div class="header">'.get_string('editevent', 'calendar').'</div>';
 357             include('event_edit.html');
 358             if ($usehtmleditor) {
 359                 use_html_editor("description");
 360             }
 361         break;
 362
 363         case 'new':
 364             optional_variable($_GET['cal_y']);
 365             optional_variable($_GET['cal_m']);
 366             optional_variable($_GET['cal_d']);
 367             optional_variable($form->timestart, -1);
 368
 369             if($_GET['cal_y'] && $_GET['cal_m'] && $_GET['cal_d'] && checkdate($_GET['cal_m'], $_GET['cal_d'], $_GET['cal_y'])) {
 370                 $form->timestart = make_timestamp($_GET['cal_y'], $_GET['cal_m'], $_GET['cal_d'], 0, 0, 0);
 371             }
 372             else if($_GET['cal_y'] && $_GET['cal_m'] && checkdate($_GET['cal_m'], 1, $_GET['cal_y'])) {
 373                 if($_GET['cal_y'] == $now['year'] && $_GET['cal_m'] == $now['mon']) {
 374                     $form->timestart = make_timestamp($_GET['cal_y'], $_GET['cal_m'], $now['mday'], 0, 0, 0);
 375                 }
 376                 else {
 377                     $form->timestart = make_timestamp($_GET['cal_y'], $_GET['cal_m'], 1, 0, 0, 0);
 378                 }
 379             }
 380             if($form->timestart < 0) {
 381                 $form->timestart = time();
 382             }
 383
 384             calendar_get_allowed_types($allowed);
 385             if(!$allowed->groups && !$allowed->courses && !$allowed->site) {
 386                 // Take the shortcut
 387                 $eventtype = 'user';
 388             }
 389
 390             $header = '';
 391
 392             switch($eventtype) {
 393                 case 'user':
 394                     $form->name = '';
 395                     $form->description = '';
 396                     $form->courseid = 0;
 397                     $form->groupid = 0;
 398                     $form->userid = $USER->id;
 399                     $form->modulename = '';
 400                     $form->eventtype = '';
 401                     $form->instance = 0;
 402                     $form->timeduration = 0;
 403                     $form->duration = 0;
 404                     $form->repeat = 0;
 405                     $form->repeats = '';
 406                     $form->minutes = '';
 407                     $header = get_string('typeuser', 'calendar');
 408                 break;
 409                 case 'group':
 410                     $groupid = optional_param('groupid', 0, PARAM_INT);
 411                     if(!($group = get_record('groups', 'id', $groupid) )) {
 412                         calendar_get_allowed_types($allowed);
 413                         $eventtype = 'select';
 414                     }
 415                     else {
 416                         $form->name = '';
 417                         $form->description = '';
 418                         $form->courseid = $group->courseid;
 419                         $form->groupid = $group->id;
 420                         $form->userid = $USER->id;
 421                         $form->modulename = '';
 422                         $form->eventtype = '';
 423                         $form->instance = 0;
 424                         $form->timeduration = 0;
 425                         $form->duration = 0;
 426                         $form->repeat = 0;
 427                         $form->repeats = '';
 428                         $form->minutes = '';
 429                         $header = get_string('typegroup', 'calendar');
 430                     }
 431                 break;
 432                 case 'course':
 433                     $courseid = optional_param('courseid', 0, PARAM_INT);
 434                     if(!record_exists('course', 'id', $courseid)) {
 435                         calendar_get_allowed_types($allowed);
 436                         $eventtype = 'select';
 437                     }
 438                     else {
 439                         $form->name = '';
 440                         $form->description = '';
 441                         $form->courseid = $courseid;
 442                         $form->groupid = 0;
 443                         $form->userid = $USER->id;
 444                         $form->modulename = '';
 445                         $form->eventtype = '';
 446                         $form->instance = 0;
 447                         $form->timeduration = 0;
 448                         $form->duration = 0;
 449                         $form->repeat = 0;
 450                         $form->repeats = '';
 451                         $form->minutes = '';
 452                         $header = get_string('typecourse', 'calendar');
 453                     }
 454                 break;
 455                 case 'site':
 456                     $form->name = '';
 457                     $form->description = '';
 458                     $form->courseid = 1;
 459                     $form->groupid = 0;
 460                     $form->userid = $USER->id;
 461                     $form->modulename = '';
 462                     $form->eventtype = '';
 463                     $form->instance = 0;
 464                     $form->timeduration = 0;
 465                     $form->duration = 0;
 466                     $form->repeat = 0;
 467                     $form->repeats = '';
 468                     $form->minutes = '';
 469                     $header = get_string('typesite', 'calendar');
 470                 break;
 471                 case 'defined':
 472                 case 'select':
 473                 break;
 474                 default:
 475                     error('Unsupported event type');
 476             }
 477
 478             $form->format = $defaultformat;
 479             if(!empty($header)) {
 480                 $header = ' ('.$header.')';
 481             }
 482
 483             echo '<div class="header">'.get_string('newevent', 'calendar').$header.'</div>';
 484
 485             if($eventtype == 'select') {
 486                 $defaultcourse = $SESSION->cal_course_referer;
 487                 if(isteacheredit($defaultcourse, $USER->id)) {
 488                     $defaultgroup = $groupid = 0;
 489                 }
 490                 else {
 491                     $defaultgroup = user_group($defaultcourse, $USER->id);
 492                     $groupid      = optional_param('groupid',  $defaultgroup->id, PARAM_INT);
 493                 }
 494                 $courseid = optional_param('courseid', $defaultcourse, PARAM_INT);
 495                 echo '<h2>'.get_string('eventkind', 'calendar').':</h2>';
 496                 echo '<div id="selecteventtype">';
 497                 include('event_select.html');
 498                 echo '</div>';
 499             }
 500             else {
 501                 include('event_new.html');
 502                 if ($usehtmleditor) {
 503                     use_html_editor("description");
 504                 }
 505             }
 506
 507         break;
 508     }
 509     echo '</td>';
 510
 511     // START: Last column (3-month display)
 512
 513     $defaultcourses = calendar_get_default_courses();
 514     calendar_set_filters($courses, $groups, $users, $defaultcourses, $defaultcourses);
 515     list($prevmon, $prevyr) = calendar_sub_month($mon, $yr);
 516     list($nextmon, $nextyr) = calendar_add_month($mon, $yr);
 517
 518     echo '<td class="sidecalendar">';
 519     echo '<div class="header">'.get_string('monthlyview', 'calendar').'</div>';
 520     echo '<div class="filters">';
 521     echo calendar_filter_controls('event', 'action='.$action.'&amp;type='.$eventtype.'&amp;id='.$eventid);
 522     echo '</div>';
 523
 524     echo '<div class="minicalendarblock">';
 525     echo calendar_top_controls('display', array('m' => $prevmon, 'y' => $prevyr));
 526     echo calendar_get_mini($courses, $groups, $users, $prevmon, $prevyr);
 527     echo '</div><div class="minicalendarblock">';
 528     echo calendar_top_controls('display', array('m' => $mon, 'y' => $yr));
 529     echo calendar_get_mini($courses, $groups, $users, $mon, $yr);
 530     echo '</div><div class="minicalendarblock">';
 531     echo calendar_top_controls('display', array('m' => $nextmon, 'y' => $nextyr));
 532     echo calendar_get_mini($courses, $groups, $users, $nextmon, $nextyr);
 533     echo '</div>';
 534
 535     echo '</td>';
 536     echo '</tr></table>';
 537
 538     print_footer();
 539
 540
 541 function validate_form(&$form, &$err) {
 542
 543     $form->name = trim($form->name);
 544     $form->description = trim($form->description);
 545
 546     if(empty($form->name)) {
 547         $err['name'] = get_string('errornoeventname', 'calendar');
 548     }
 549     if(empty($form->description)) {
 550         $err['description'] = get_string('errornodescription', 'calendar');
 551     }
 552     if(!checkdate($form->startmon, $form->startday, $form->startyr)) {
 553         $err['timestart'] = get_string('errorinvaliddate', 'calendar');
 554     }
 555     if($form->duration == 2 and !checkdate($form->endmon, $form->endday, $form->endyr)) {
 556         $err['timeduration'] = get_string('errorinvaliddate', 'calendar');
 557     }
 558     if($form->duration == 2 and !($form->minutes > 0 and $form->minutes < 1000)) {
 559         $err['minutes'] = get_string('errorinvalidminutes', 'calendar');
 560     }
 561     if (!empty($form->repeat) and !($form->repeats > 1 and $form->repeats < 100)) {
 562         $err['repeats'] = get_string('errorinvalidrepeats', 'calendar');
 563     }
 564     if(!empty($form->courseid)) {
 565         // Timestamps must be >= course startdate
 566         $course = get_record('course', 'id', $form->courseid);
 567         if($course === false) {
 568             error('Event belongs to invalid course');
 569         }
 570         else if($form->timestart < $course->startdate) {
 571             $err['timestart'] = get_string('errorbeforecoursestart', 'calendar');
 572         }
 573     }
 574 }
 575
 576 function calendar_add_event_allowed($courseid, $groupid, $userid) {
 577     global $USER;
 578
 579     if(isadmin()) {
 580         return true;
 581     }
 582     else if($courseid == 0 && $groupid == 0 && $userid == $USER->id) {
 583         return true;
 584     }
 585     else if($courseid == 0 && $groupid != 0) {
 586         $group = get_record('groups', 'id', $groupid);
 587         if($group === false) {
 588             return false;
 589         }
 590         return isteacheredit($group->courseid) || isteacher($group->courseid) && ismember($groupid);
 591     }
 592     else if($courseid != 0 && isteacher($courseid)) {
 593         return true;
 594     }
 595
 596     return false;
 597 }
 598
 599 function calendar_get_allowed_types(&$allowed) {
 600     global $USER, $CFG, $SESSION;
 601
 602     $allowed->user = true; // User events always allowed
 603     $allowed->groups = false; // This may change just below
 604     $allowed->courses = false; // This may change just below
 605     $allowed->site = isteacher(SITEID);
 606
 607     if(!empty($SESSION->cal_course_referer) && $SESSION->cal_course_referer != SITEID && isteacher($SESSION->cal_course_referer, $USER->id)) {
 608         $course = get_record('course', 'id', $SESSION->cal_course_referer);
 609
 610         $allowed->courses = array($course->id => 1);
 611
 612         if($course->groupmode != NOGROUPS || !$course->groupmodeforce) {
 613             $allowed->groups = get_groups($SESSION->cal_course_referer);
 614         }
 615     }
 616 }
 617
 618 ?>