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@teikav.edu.gr)                         //
  13 //     Jon Papaioannou (pj@moodle.org)                                     //
  14 //                                                                         //
  15 // Programming and development:                                            //
  16 //     Jon Papaioannou (pj@moodle.org)                                     //
  17 //                                                                         //
  18 // For bugs, suggestions, etc contact:                                     //
  19 //     Jon Papaioannou (pj@moodle.org)                                     //
  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     $action = required_param('action', PARAM_ALPHA);
  49     $eventid = optional_param('id', 0, PARAM_INT);
  50     $eventtype = optional_param('type', 'select', PARAM_ALPHA);
  51     $urlcourse = optional_param('course', 0, PARAM_INT);
  52     $cal_y = optional_param('cal_y');
  53     $cal_m = optional_param('cal_m');
  54     $cal_d = optional_param('cal_d');
  55
  56     if(isguest()) {
  57         // Guests cannot do anything with events
  58         redirect(CALENDAR_URL.'view.php?view=upcoming&amp;course='.$urlcourse);
  59     }
  60
  61     $focus = '';
  62
  63     if(!$site = get_site()) {
  64         redirect($CFG->wwwroot.'/'.$CFG->admin.'/index.php');
  65     }
  66
  67     $strcalendar = get_string('calendar', 'calendar');
  68
  69     // Initialize the session variables
  70     calendar_session_vars();
  71
  72     $now = usergetdate(time());
  73     $navlinks = array();
  74     $calendar_navlink = array('name' => $strcalendar,
  75                           'link' =>calendar_get_link_href(CALENDAR_URL.'view.php?view=upcoming&amp;course='.$urlcourse.'&amp;',
  76                                                           $now['mday'], $now['mon'], $now['year']),
  77                           'type' => 'misc');
  78
  79     $day = intval($now['mday']);
  80     $mon = intval($now['mon']);
  81     $yr = intval($now['year']);
  82
  83     if ($usehtmleditor = can_use_richtext_editor()) {
  84         $defaultformat = FORMAT_HTML;
  85     } else {
  86         $defaultformat = FORMAT_MOODLE;
  87     }
  88
  89     // If a course has been supplied in the URL, change the filters to show that one
  90     if($urlcourse > 0 && record_exists('course', 'id', $urlcourse)) {
  91         require_login($urlcourse, false);
  92
  93         if($urlcourse == SITEID) {
  94             // If coming from the site page, show all courses
  95             $SESSION->cal_courses_shown = calendar_get_default_courses(true);
  96             calendar_set_referring_course(0);
  97         }
  98         else {
  99             // Otherwise show just this one
 100             $SESSION->cal_courses_shown = $urlcourse;
 101             calendar_set_referring_course($SESSION->cal_courses_shown);
 102         }
 103     }
 104
 105     $form = null;
 106
 107     switch($action) {
 108         case 'delete':
 109             $title = get_string('deleteevent', 'calendar');
 110             $event = get_record('event', 'id', $eventid);
 111             if($event === false) {
 112                 error('Invalid event');
 113             }
 114             if(!calendar_edit_event_allowed($event)) {
 115                 error('You are not authorized to do this');
 116             }
 117         break;
 118
 119         case 'edit':
 120             $title = get_string('editevent', 'calendar');
 121             $event = get_record('event', 'id', $eventid);
 122             $repeats = optional_param('repeats', 0, PARAM_INT);
 123
 124             if($event === false) {
 125                 error('Invalid event');
 126             }
 127             if(!calendar_edit_event_allowed($event)) {
 128                 error('You are not authorized to do this');
 129             }
 130
 131             if($form = data_submitted() and confirm_sesskey()) {
 132
 133                 $form->name = clean_param(strip_tags($form->name,'<lang><span>'), PARAM_CLEAN);
 134
 135                 $form->timestart = make_timestamp($form->startyr, $form->startmon, $form->startday, $form->starthr, $form->startmin);
 136                 if($form->duration == 1) {
 137                     $form->timeduration = make_timestamp($form->endyr, $form->endmon, $form->endday, $form->endhr, $form->endmin) - $form->timestart;
 138                     if($form->timeduration < 0) {
 139                         $form->timeduration = 0;
 140                     }
 141                 }
 142                 else if($form->duration == 2) {
 143                     $form->timeduration = $form->minutes * MINSECS;
 144                 }
 145                 else {
 146                     $form->timeduration = 0;
 147                 }
 148
 149                 validate_form($form, $err);
 150
 151                 if (count($err) == 0) {
 152
 153                     if($event->repeatid && $repeats) {
 154                         // Update all
 155                         if($form->timestart >= $event->timestart) {
 156                             $timestartoffset = 'timestart + '.($form->timestart - $event->timestart);
 157                         }
 158                         else {
 159                             $timestartoffset = 'timestart - '.($event->timestart - $form->timestart);
 160                         }
 161
 162                         execute_sql('UPDATE '.$CFG->prefix.'event SET '.
 163                             'name = \''.$form->name.'\','.
 164                             'description = \''.$form->description.'\','.
 165                             'timestart = '.$timestartoffset.','.
 166                             'timeduration = '.$form->timeduration.','.
 167                             'timemodified = '.time().' WHERE repeatid = '.$event->repeatid);
 168
 169                         /// Log the event update.
 170                         add_to_log($form->courseid, 'calendar', 'edit all', 'event.php?action=edit&amp;id='.$form->id, stripslashes($form->name));
 171                     }
 172
 173                     else {
 174                         // Update this
 175                         $form->timemodified = time();
 176                         update_record('event', $form);
 177
 178                         /// Log the event update.
 179                         add_to_log($form->courseid, 'calendar', 'edit', 'event.php?action=edit&amp;id='.$form->id, stripslashes($form->name));
 180                     }
 181
 182                     // OK, now redirect to day view
 183                     redirect(CALENDAR_URL.'view.php?view=day&amp;course='.$urlcourse.'&cal_d='.$form->startday.'&cal_m='.$form->startmon.'&cal_y='.$form->startyr);
 184                 }
 185                 else {
 186                     foreach ($err as $key => $value) {
 187                         $focus = 'form.'.$key;
 188                     }
 189                 }
 190             }
 191         break;
 192
 193         case 'new':
 194             $title = get_string('newevent', 'calendar');
 195             $form = data_submitted();
 196             if(!empty($form) && !empty($form->name) && confirm_sesskey()) {
 197
 198                 $form->name = clean_text(strip_tags($form->name, '<lang><span>'));
 199
 200                 $form->timestart = make_timestamp($form->startyr, $form->startmon, $form->startday, $form->starthr, $form->startmin);
 201                 if($form->duration == 1) {
 202                     $form->timeduration = make_timestamp($form->endyr, $form->endmon, $form->endday, $form->endhr, $form->endmin) - $form->timestart;
 203                     if($form->timeduration < 0) {
 204                         $form->timeduration = 0;
 205                     }
 206                 }
 207                 else if ($form->duration == 2) {
 208                     $form->timeduration = $form->minutes * MINSECS;
 209                 }
 210                 else {
 211                     $form->timeduration = 0;
 212                 }
 213                 if(!calendar_add_event_allowed($form)) {
 214                     error('You are not authorized to do this');
 215                 }
 216                 validate_form($form, $err);
 217                 if (count($err) == 0) {
 218                     $form->timemodified = time();
 219
 220                     /// Get the event id for the log record.
 221                     $eventid = insert_record('event', $form, true);
 222
 223                     /// Use the event id as the repeatid to link repeat entries together
 224                     if ($form->repeat) {
 225                         $form->repeatid = $form->id = $eventid;
 226                         update_record('event', $form);         // update the row, to set its repeatid
 227                     }
 228
 229                     /// Log the event entry.
 230                     add_to_log($form->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$eventid, stripslashes($form->name));
 231
 232                     if ($form->repeat) {
 233                         for($i = 1; $i < $form->repeats; $i++) {
 234                             // What's the DST offset for the previous repeat?
 235                             $dst_offset_prev = dst_offset_on($form->timestart);
 236
 237                             $form->timestart += WEEKSECS;
 238
 239                             // If the offset has changed in the meantime, update this repeat accordingly
 240                             $form->timestart += $dst_offset_prev - dst_offset_on($form->timestart);
 241
 242                             /// Get the event id for the log record.
 243                             $eventid = insert_record('event', $form, true);
 244
 245                             /// Log the event entry.
 246                             add_to_log($form->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$eventid, stripslashes($form->name));
 247                         }
 248                     }
 249                     // OK, now redirect to day view
 250                     redirect(CALENDAR_URL.'view.php?view=day&amp;course='.$urlcourse.'&cal_d='.$form->startday.'&cal_m='.$form->startmon.'&cal_y='.$form->startyr);
 251                 }
 252                 else {
 253                     foreach ($err as $key => $value) {
 254                         $focus = 'form.'.$key;
 255                     }
 256                 }
 257             }
 258         break;
 259         default: // no action
 260             $title='';
 261         break;
 262     }
 263
 264     $form = stripslashes_recursive($form);
 265
 266     if (!empty($SESSION->cal_course_referer)) {
 267         // TODO: This is part of the Great $course Hack in Moodle. Replace it at some point.
 268         $course = get_record('course', 'id', $SESSION->cal_course_referer);
 269     } else {
 270         $course = $site;
 271     }
 272     require_login($course, false);
 273
 274     $navlinks[] = $calendar_navlink;
 275     $navlinks[] = array('name' => $title, 'link' => null, 'type' => 'misc');
 276     $navigation = build_navigation($navlinks);
 277     print_header($site->shortname.': '.$strcalendar.': '.$title, $strcalendar, $navigation,
 278                  'eventform.name', '', true, '', user_login_string($site));
 279
 280     echo calendar_overlib_html();
 281
 282     echo '<table id="calendar">';
 283     echo '<tr><td class="maincalendar">';
 284
 285     switch($action) {
 286         case 'delete':
 287             $confirm = optional_param('confirm', 0, PARAM_INT);
 288             $repeats = optional_param('repeats', 0, PARAM_INT);
 289             if($confirm and confirm_sesskey()) {
 290                 // Kill it and redirect to day view
 291                 if(($event = get_record('event', 'id', $eventid)) !== false) {
 292
 293                     if($event->repeatid && $repeats) {
 294                         delete_records('event', 'repeatid', $event->repeatid);
 295                         add_to_log($event->courseid, 'calendar', 'delete all', '', $event->name);
 296                     }
 297                     else {
 298                         delete_records('event', 'id', $eventid);
 299                         add_to_log($event->courseid, 'calendar', 'delete', '', $event->name);
 300                     }
 301                 }
 302
 303                 echo '</td></tr></table>';
 304                 redirect(CALENDAR_URL.'view.php?view=day&amp;course='.$urlcourse.'&cal_d='.$_REQUEST['d'].'&cal_m='.$_REQUEST['m'].'&cal_y='.$_REQUEST['y']);
 305
 306             }
 307             else {
 308                 $eventtime = usergetdate($event->timestart);
 309                 $m = $eventtime['mon'];
 310                 $d = $eventtime['mday'];
 311                 $y = $eventtime['year'];
 312
 313                 if($event->repeatid) {
 314                     $fetch = get_record_sql('SELECT 1, COUNT(id) AS repeatcount FROM '.$CFG->prefix.'event WHERE repeatid = '.$event->repeatid);
 315                     $repeatcount = $fetch->repeatcount;
 316                 }
 317                 else {
 318                     $repeatcount = 0;
 319                 }
 320
 321                 // Display confirmation form
 322                 echo '<div class="header">'.get_string('deleteevent', 'calendar').': '.$event->name.'</div>';
 323                 echo '<h2>'.get_string('confirmeventdelete', 'calendar').'</h2>';
 324                 if($repeatcount > 1) {
 325                     echo '<p>'.get_string('youcandeleteallrepeats', 'calendar', $repeatcount).'</p>';
 326                 }
 327                 echo '<div class="eventlist">';
 328                 $event->time = calendar_format_event_time($event, time(), '', false);
 329                 calendar_print_event($event);
 330                 echo '</div>';
 331                 include('event_delete.html');
 332             }
 333         break;
 334
 335         case 'edit':
 336             if(empty($form)) {
 337                 $form->name = clean_text($event->name);
 338                 $form->courseid = $event->courseid; // Not to update, but for date validation
 339                 $form->description = clean_text($event->description);
 340                 $form->timestart = $event->timestart;
 341                 $form->timeduration = $event->timeduration;
 342                 $form->id = $event->id;
 343                 $form->format = $defaultformat;
 344                 if($event->timeduration > HOURSECS) {
 345                     // More than one hour, so default to normal duration mode
 346                     $form->duration = 1;
 347                     $form->minutes = '';
 348                 }
 349                 else if($event->timeduration) {
 350                     // Up to one hour, "minutes" mode probably is better here
 351                     $form->duration = 2;
 352                     $form->minutes = $event->timeduration / MINSECS;
 353                 }
 354                 else {
 355                     // No duration
 356                     $form->duration = 0;
 357                     $form->minutes = '';
 358                 }
 359             }
 360
 361             if (!empty($form->courseid)) {
 362                 // TODO: This is part of the Great $course Hack in Moodle. Replace it at some point.
 363                 $course = get_record('course', 'id', $form->courseid);
 364             } else {
 365                 $course = $site;
 366             }
 367
 368             if($event->repeatid) {
 369                 $fetch = get_record_sql('SELECT 1, COUNT(id) AS repeatcount FROM '.$CFG->prefix.'event WHERE repeatid = '.$event->repeatid);
 370                 $repeatcount = $fetch->repeatcount;
 371             }
 372             else {
 373                 $repeatcount = 0;
 374             }
 375
 376             echo '<div class="header">'.get_string('editevent', 'calendar').'</div>';
 377             include('event_edit.html');
 378             if ($usehtmleditor) {
 379                 use_html_editor("description");
 380             }
 381         break;
 382
 383         case 'new':
 384             if($cal_y && $cal_m && $cal_d && checkdate($cal_m, $cal_d, $cal_y)) {
 385                 $form->timestart = make_timestamp($cal_y, $cal_m, $cal_d, 0, 0, 0);
 386             }
 387             else if($cal_y && $cal_m && checkdate($cal_m, 1, $cal_y)) {
 388                 if($cal_y == $now['year'] && $cal_m == $now['mon']) {
 389                     $form->timestart = make_timestamp($cal_y, $cal_m, $now['mday'], 0, 0, 0);
 390                 }
 391                 else {
 392                     $form->timestart = make_timestamp($cal_y, $cal_m, 1, 0, 0, 0);
 393                 }
 394             }
 395             if(!isset($form->timestart) or $form->timestart < 0) {
 396                 $form->timestart = time();
 397             }
 398
 399             calendar_get_allowed_types($allowed);
 400             if(!$allowed->groups && !$allowed->courses && !$allowed->site) {
 401                 // Take the shortcut
 402                 $eventtype = 'user';
 403             }
 404
 405             $header = '';
 406
 407             switch($eventtype) {
 408                 case 'user':
 409                     $form->name = '';
 410                     $form->description = '';
 411                     $form->courseid = 0;
 412                     $form->groupid = 0;
 413                     $form->userid = $USER->id;
 414                     $form->modulename = '';
 415                     $form->eventtype = '';
 416                     $form->instance = 0;
 417                     $form->timeduration = 0;
 418                     $form->duration = 0;
 419                     $form->repeat = 0;
 420                     $form->repeats = '';
 421                     $form->minutes = '';
 422                     $form->type = 'user';
 423                     $header = get_string('typeuser', 'calendar');
 424                 break;
 425                 case 'group':
 426                     $groupid = optional_param('groupid', 0, PARAM_INT);
 427                     if (! ($group = groups_get_group($groupid))) { //TODO:check.
 428                         calendar_get_allowed_types($allowed);
 429                         $eventtype = 'select';
 430                     }
 431                     else {
 432                         $form->name = '';
 433                         $form->description = '';
 434                         $form->courseid = $group->courseid;
 435                         $form->groupid = $group->id;
 436                         $form->userid = $USER->id;
 437                         $form->modulename = '';
 438                         $form->eventtype = '';
 439                         $form->instance = 0;
 440                         $form->timeduration = 0;
 441                         $form->duration = 0;
 442                         $form->repeat = 0;
 443                         $form->repeats = '';
 444                         $form->minutes = '';
 445                         $form->type = 'group';
 446                         $header = get_string('typegroup', 'calendar');
 447                     }
 448                 break;
 449                 case 'course':
 450                     $courseid = optional_param('courseid', 0, PARAM_INT);
 451                     if(!record_exists('course', 'id', $courseid)) {
 452                         calendar_get_allowed_types($allowed);
 453                         $eventtype = 'select';
 454                     }
 455                     else {
 456                         $form->name = '';
 457                         $form->description = '';
 458                         $form->courseid = $courseid;
 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                         $form->type = 'course';
 470                         $header = get_string('typecourse', 'calendar');
 471                     }
 472                 break;
 473                 case 'site':
 474                     $form->name = '';
 475                     $form->description = '';
 476                     $form->courseid = SITEID;
 477                     $form->groupid = 0;
 478                     $form->userid = $USER->id;
 479                     $form->modulename = '';
 480                     $form->eventtype = '';
 481                     $form->instance = 0;
 482                     $form->timeduration = 0;
 483                     $form->duration = 0;
 484                     $form->repeat = 0;
 485                     $form->repeats = '';
 486                     $form->minutes = '';
 487                     $form->type = 'site';
 488                     $header = get_string('typesite', 'calendar');
 489                 break;
 490                 case 'select':
 491                 break;
 492                 default:
 493                     error('Unsupported event type');
 494             }
 495
 496             $form->format = $defaultformat;
 497             if(!empty($header)) {
 498                 $header = ' ('.$header.')';
 499             }
 500
 501             echo '<div class="header">'.get_string('newevent', 'calendar').$header.'</div>';
 502
 503             if($eventtype == 'select') {
 504                 $courseid = optional_param('courseid', $SESSION->cal_course_referer, PARAM_INT);
 505                 if ($courseid == 0) { // workaround by Dan for bug #6130
 506                     $courseid = SITEID;
 507                 }
 508                 if (!$course = get_record('course', 'id', $courseid)) {
 509                     error('Incorrect course ID');
 510                 }
 511
 512                 $groupid = groups_get_course_group($course);
 513
 514                 echo '<h2>'.get_string('eventkind', 'calendar').':</h2>';
 515                 echo '<div id="selecteventtype">';
 516                 include('event_select.html');
 517                 echo '</div>';
 518             }
 519             else {
 520                 include('event_new.html');
 521                 if ($usehtmleditor) {
 522                     use_html_editor("description");
 523                 }
 524             }
 525
 526         break;
 527     }
 528     echo '</td>';
 529
 530     // START: Last column (3-month display)
 531
 532     $defaultcourses = calendar_get_default_courses();
 533     //calendar_set_filters($courses, $groups, $users, $defaultcourses, $defaultcourses);
 534
 535     // when adding an event you can not be a guest, so I think it's reasonalbe to ignore defaultcourses
 536     // MDL-10353
 537     calendar_set_filters($courses, $groups, $users);
 538     list($prevmon, $prevyr) = calendar_sub_month($mon, $yr);
 539     list($nextmon, $nextyr) = calendar_add_month($mon, $yr);
 540
 541     echo '<td class="sidecalendar">';
 542     echo '<div class="sideblock">';
 543     echo '<div class="header"><h2>'.get_string('eventskey', 'calendar').'</h2></div>';
 544     echo '<div class="filters">';
 545     echo calendar_filter_controls('event', 'action='.$action.'&amp;type='.$eventtype.'&amp;id='.$eventid);
 546     echo '</div>';
 547     echo '</div>';
 548
 549     echo '<div class="sideblock">';
 550     echo '<div class="header"><h2>'.get_string('monthlyview', 'calendar').'</h2></div>';
 551
 552     echo '<div class="minicalendarblock minicalendartop">';
 553     echo calendar_top_controls('display', array('id' => $urlcourse, 'm' => $prevmon, 'y' => $prevyr));
 554     echo calendar_get_mini($courses, $groups, $users, $prevmon, $prevyr);
 555     echo '</div><div class="minicalendarblock">';
 556     echo calendar_top_controls('display', array('id' => $urlcourse, 'm' => $mon, 'y' => $yr));
 557     echo calendar_get_mini($courses, $groups, $users, $mon, $yr);
 558     echo '</div><div class="minicalendarblock">';
 559     echo calendar_top_controls('display', array('id' => $urlcourse, 'm' => $nextmon, 'y' => $nextyr));
 560     echo calendar_get_mini($courses, $groups, $users, $nextmon, $nextyr);
 561     echo '</div>';
 562     echo '</div>';
 563
 564     echo '</td>';
 565     echo '</tr></table>';
 566
 567     print_footer();
 568
 569
 570 function validate_form(&$form, &$err) {
 571
 572     $form->name = trim($form->name);
 573     $form->description = trim($form->description);
 574
 575     if(empty($form->name)) {
 576         $err['name'] = get_string('errornoeventname', 'calendar');
 577     }
 578 /* Allow events without a description
 579     if(empty($form->description)) {
 580         $err['description'] = get_string('errornodescription', 'calendar');
 581     }
 582 */
 583     if(!checkdate($form->startmon, $form->startday, $form->startyr)) {
 584         $err['timestart'] = get_string('errorinvaliddate', 'calendar');
 585     }
 586     if($form->duration == 2 and !checkdate($form->endmon, $form->endday, $form->endyr)) {
 587         $err['timeduration'] = get_string('errorinvaliddate', 'calendar');
 588     }
 589     if($form->duration == 2 and !($form->minutes > 0 and $form->minutes < 1000)) {
 590         $err['minutes'] = get_string('errorinvalidminutes', 'calendar');
 591     }
 592     if (!empty($form->repeat) and !($form->repeats > 1 and $form->repeats < 100)) {
 593         $err['repeats'] = get_string('errorinvalidrepeats', 'calendar');
 594     }
 595     if(!empty($form->courseid)) {
 596         // Timestamps must be >= course startdate
 597         $course = get_record('course', 'id', $form->courseid);
 598         if($course === false) {
 599             error('Event belongs to invalid course');
 600         }
 601         else if($form->timestart < $course->startdate) {
 602             $err['timestart'] = get_string('errorbeforecoursestart', 'calendar');
 603         }
 604     }
 605 }
 606
 607 function calendar_add_event_allowed($event) {
 608     global $USER;
 609
 610     // can not be using guest account
 611     if (empty($USER->id) or $USER->username == 'guest') {
 612         return false;
 613     }
 614
 615     $sitecontext = get_context_instance(CONTEXT_SYSTEM);
 616     // if user has manageentries at site level, always return true
 617     if (has_capability('moodle/calendar:manageentries', $sitecontext)) {
 618         return true;
 619     }
 620
 621     switch ($event->type) {
 622         case 'course':
 623             return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $event->courseid));
 624
 625         case 'group':
 626             // Allow users to add/edit group events if:
 627             // 1) They have manageentries (= entries for whole course)
 628             // 2) They have managegroupentries AND are in the group
 629             $group = get_record('groups', 'id', $event->groupid);
 630             return $group && (
 631                 has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $group->courseid)) ||
 632                 (has_capability('moodle/calendar:managegroupentries', get_context_instance(CONTEXT_COURSE, $group->courseid))
 633                     && groups_is_member($event->groupid)));
 634
 635         case 'user':
 636             if ($event->userid == $USER->id) {
 637                 return (has_capability('moodle/calendar:manageownentries', $sitecontext));
 638             }
 639             //there is no 'break;' intentionally
 640
 641         case 'site':
 642             return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, SITEID));
 643
 644         default:
 645             return false;
 646     }
 647 }
 648 ?>