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     $nav = calendar_get_link_tag($strcalendar, CALENDAR_URL.'view.php?view=upcoming&amp;course='.$urlcourse.'&amp;', $now['mday'], $now['mon'], $now['year']);
  74     $day = intval($now['mday']);
  75     $mon = intval($now['mon']);
  76     $yr = intval($now['year']);
  77
  78     if ($usehtmleditor = can_use_richtext_editor()) {
  79         $defaultformat = FORMAT_HTML;
  80     } else {
  81         $defaultformat = FORMAT_MOODLE;
  82     }
  83
  84     // If a course has been supplied in the URL, change the filters to show that one
  85     if($urlcourse > 0 && record_exists('course', 'id', $urlcourse)) {
  86         require_login($urlcourse, false);
  87
  88         if($urlcourse == SITEID) {
  89             // If coming from the site page, show all courses
  90             $SESSION->cal_courses_shown = calendar_get_default_courses(true);
  91             calendar_set_referring_course(0);
  92         }
  93         else {
  94             // Otherwise show just this one
  95             $SESSION->cal_courses_shown = $urlcourse;
  96             calendar_set_referring_course($SESSION->cal_courses_shown);
  97         }
  98     }
  99
 100     switch($action) {
 101         case 'delete':
 102             $title = get_string('deleteevent', 'calendar');
 103             $event = get_record('event', 'id', $eventid);
 104             if($event === false) {
 105                 error('Invalid event');
 106             }
 107             if(!calendar_edit_event_allowed($event)) {
 108                 error('You are not authorized to do this');
 109             }
 110         break;
 111
 112         case 'edit':
 113             $title = get_string('editevent', 'calendar');
 114             $event = get_record('event', 'id', $eventid);
 115             $repeats = optional_param('repeats', 0, PARAM_INT);
 116
 117             if($event === false) {
 118                 error('Invalid event');
 119             }
 120             if(!calendar_edit_event_allowed($event)) {
 121                 error('You are not authorized to do this');
 122             }
 123
 124             if($form = data_submitted()) {
 125
 126                 $form->name = clean_param(strip_tags($form->name,'<lang><span>'), PARAM_CLEAN);
 127
 128                 $form->timestart = make_timestamp($form->startyr, $form->startmon, $form->startday, $form->starthr, $form->startmin);
 129                 if($form->duration == 1) {
 130                     $form->timeduration = make_timestamp($form->endyr, $form->endmon, $form->endday, $form->endhr, $form->endmin) - $form->timestart;
 131                     if($form->timeduration < 0) {
 132                         $form->timeduration = 0;
 133                     }
 134                 }
 135                 else if($form->duration == 2) {
 136                     $form->timeduration = $form->minutes * MINSECS;
 137                 }
 138                 else {
 139                     $form->timeduration = 0;
 140                 }
 141
 142                 validate_form($form, $err);
 143
 144                 if (count($err) == 0) {
 145
 146                     if($event->repeatid && $repeats) {
 147                         // Update all
 148                         if($form->timestart >= $event->timestart) {
 149                             $timestartoffset = 'timestart + '.($form->timestart - $event->timestart);
 150                         }
 151                         else {
 152                             $timestartoffset = 'timestart - '.($event->timestart - $form->timestart);
 153                         }
 154
 155                         execute_sql('UPDATE '.$CFG->prefix.'event SET '.
 156                             'name = '.$db->qstr($form->name).','.
 157                             'description = '.$db->qstr($form->description).','.
 158                             'timestart = '.$timestartoffset.','.
 159                             'timeduration = '.$form->timeduration.','.
 160                             'timemodified = '.time().' WHERE repeatid = '.$event->repeatid);
 161
 162                         /// Log the event update.
 163                         $form->name = stripslashes($form->name);  //To avoid double-slashes
 164                         add_to_log($form->courseid, 'calendar', 'edit all', 'event.php?action=edit&amp;id='.$form->id, $form->name);
 165                     }
 166
 167                     else {
 168                         // Update this
 169                         $form->timemodified = time();
 170                         update_record('event', $form);
 171
 172                         /// Log the event update.
 173                         $form->name = stripslashes($form->name);  //To avoid double-slashes
 174                         add_to_log($form->courseid, 'calendar', 'edit', 'event.php?action=edit&amp;id='.$form->id, $form->name);
 175                     }
 176
 177                     // OK, now redirect to day view
 178                     redirect(CALENDAR_URL.'view.php?view=day&amp;course='.$urlcourse.'&cal_d='.$form->startday.'&cal_m='.$form->startmon.'&cal_y='.$form->startyr);
 179                 }
 180                 else {
 181                     foreach ($err as $key => $value) {
 182                         $focus = 'form.'.$key;
 183                     }
 184                 }
 185             }
 186         break;
 187
 188         case 'new':
 189             $title = get_string('newevent', 'calendar');
 190             $form = data_submitted();
 191             if(!empty($form) && !empty($form->name)) {
 192
 193                 $form->name = clean_text(strip_tags($form->name, '<lang><span>'));
 194
 195                 $form->timestart = make_timestamp($form->startyr, $form->startmon, $form->startday, $form->starthr, $form->startmin);
 196                 if($form->duration == 1) {
 197                     $form->timeduration = make_timestamp($form->endyr, $form->endmon, $form->endday, $form->endhr, $form->endmin) - $form->timestart;
 198                     if($form->timeduration < 0) {
 199                         $form->timeduration = 0;
 200                     }
 201                 }
 202                 else if ($form->duration == 2) {
 203                     $form->timeduration = $form->minutes * MINSECS;
 204                 }
 205                 else {
 206                     $form->timeduration = 0;
 207                 }
 208                 if(!calendar_add_event_allowed($form)) {
 209                     error('You are not authorized to do this');
 210                 }
 211                 validate_form($form, $err);
 212                 if (count($err) == 0) {
 213                     $form->timemodified = time();
 214
 215                     if ($form->repeat) {
 216                         $fetch = get_record_sql('SELECT 1, MAX(repeatid) AS repeatid FROM '.$CFG->prefix.'event');
 217                         $form->repeatid = empty($fetch) ? 1 : $fetch->repeatid + 1;
 218                     }
 219
 220                     /// Get the event id for the log record.
 221                     $eventid = insert_record('event', $form, true);
 222
 223                     /// Log the event entry.
 224                     add_to_log($form->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$eventid, stripslashes($form->name));
 225
 226                     if ($form->repeat) {
 227                         for($i = 1; $i < $form->repeats; $i++) {
 228                             // What's the DST offset for the previous repeat?
 229                             $dst_offset_prev = dst_offset_on($form->timestart);
 230
 231                             $form->timestart += WEEKSECS;
 232
 233                             // If the offset has changed in the meantime, update this repeat accordingly
 234                             $form->timestart += $dst_offset_prev - dst_offset_on($form->timestart);
 235
 236                             /// Get the event id for the log record.
 237                             $eventid = insert_record('event', $form, true);
 238
 239                             /// Log the event entry.
 240                             add_to_log($form->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$eventid, stripslashes($form->name));
 241                         }
 242                     }
 243                     // OK, now redirect to day view
 244                     redirect(CALENDAR_URL.'view.php?view=day&amp;course='.$urlcourse.'&cal_d='.$form->startday.'&cal_m='.$form->startmon.'&cal_y='.$form->startyr);
 245                 }
 246                 else {
 247                     foreach ($err as $key => $value) {
 248                         $focus = 'form.'.$key;
 249                     }
 250                 }
 251             }
 252         break;
 253         default: // no action
 254             $title='';
 255         break;
 256     }
 257
 258     // Let's see if we are supposed to provide a referring course link
 259     // but NOT for the "main page" course
 260     if($SESSION->cal_course_referer != SITEID &&
 261       ($shortname = get_field('course', 'shortname', 'id', $SESSION->cal_course_referer)) !== false) {
 262         // If we know about the referring course, show a return link
 263         $nav = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$SESSION->cal_course_referer.'">'.$shortname.'</a> -> '.$nav;
 264     }
 265
 266     if (!empty($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     print_header($site->shortname.': '.$strcalendar.': '.$title, $strcalendar, $nav.' -> '.$title,
 275                  'eventform.name', '', true, '', user_login_string($site));
 276
 277     echo calendar_overlib_html();
 278
 279     echo '<table id="calendar">';
 280     echo '<tr><td class="maincalendar">';
 281
 282     switch($action) {
 283         case 'delete':
 284             $confirm = optional_param('confirm', 0, PARAM_INT);
 285             $repeats = optional_param('repeats', 0, PARAM_INT);
 286             if($confirm) {
 287                 // Kill it and redirect to day view
 288                 if(($event = get_record('event', 'id', $eventid)) !== false) {
 289
 290                     if($event->repeatid && $repeats) {
 291                         delete_records('event', 'repeatid', $event->repeatid);
 292                         add_to_log($event->courseid, 'calendar', 'delete all', '', $event->name);
 293                     }
 294                     else {
 295                         delete_records('event', 'id', $eventid);
 296                         add_to_log($event->courseid, 'calendar', 'delete', '', $event->name);
 297                     }
 298                 }
 299
 300                 redirect(CALENDAR_URL.'view.php?view=day&amp;course='.$urlcourse.'&cal_d='.$_REQUEST['d'].'&cal_m='.$_REQUEST['m'].'&cal_y='.$_REQUEST['y']);
 301
 302             }
 303             else {
 304                 $eventtime = usergetdate($event->timestart);
 305                 $m = $eventtime['mon'];
 306                 $d = $eventtime['mday'];
 307                 $y = $eventtime['year'];
 308
 309                 if($event->repeatid) {
 310                     $fetch = get_record_sql('SELECT 1, COUNT(id) AS repeatcount FROM '.$CFG->prefix.'event WHERE repeatid = '.$event->repeatid);
 311                     $repeatcount = $fetch->repeatcount;
 312                 }
 313                 else {
 314                     $repeatcount = 0;
 315                 }
 316
 317                 // Display confirmation form
 318                 echo '<div class="header">'.get_string('deleteevent', 'calendar').': '.$event->name.'</div>';
 319                 echo '<h2>'.get_string('confirmeventdelete', 'calendar').'</h2>';
 320                 if($repeatcount > 1) {
 321                     echo '<p>'.get_string('youcandeleteallrepeats', 'calendar', $repeatcount).'</p>';
 322                 }
 323                 echo '<div class="eventlist">';
 324                 $event->time = calendar_format_event_time($event, time(), '', false);
 325                 calendar_print_event($event);
 326                 echo '</div>';
 327                 include('event_delete.html');
 328             }
 329         break;
 330
 331         case 'edit':
 332             if(empty($form)) {
 333                 $form->name = $event->name;
 334                 $form->courseid = $event->courseid; // Not to update, but for date validation
 335                 $form->description = $event->description;
 336                 $form->timestart = $event->timestart;
 337                 $form->timeduration = $event->timeduration;
 338                 $form->id = $event->id;
 339                 $form->format = $defaultformat;
 340                 if($event->timeduration > HOURSECS) {
 341                     // More than one hour, so default to normal duration mode
 342                     $form->duration = 1;
 343                     $form->minutes = '';
 344                 }
 345                 else if($event->timeduration) {
 346                     // Up to one hour, "minutes" mode probably is better here
 347                     $form->duration = 2;
 348                     $form->minutes = $event->timeduration / MINSECS;
 349                 }
 350                 else {
 351                     // No duration
 352                     $form->duration = 0;
 353                     $form->minutes = '';
 354                 }
 355             }
 356
 357             if (!empty($form->courseid)) {
 358                 // TODO: This is part of the Great $course Hack in Moodle. Replace it at some point.
 359                 $course = get_record('course', 'id', $form->courseid);
 360             } else {
 361                 $course = $site;
 362             }
 363
 364             if($event->repeatid) {
 365                 $fetch = get_record_sql('SELECT 1, COUNT(id) AS repeatcount FROM '.$CFG->prefix.'event WHERE repeatid = '.$event->repeatid);
 366                 $repeatcount = $fetch->repeatcount;
 367             }
 368             else {
 369                 $repeatcount = 0;
 370             }
 371
 372             echo '<div class="header">'.get_string('editevent', 'calendar').'</div>';
 373             include('event_edit.html');
 374             if ($usehtmleditor) {
 375                 use_html_editor("description");
 376             }
 377         break;
 378
 379         case 'new':
 380             if($cal_y && $cal_m && $cal_d && checkdate($cal_m, $cal_d, $cal_y)) {
 381                 $form->timestart = make_timestamp($cal_y, $cal_m, $cal_d, 0, 0, 0);
 382             }
 383             else if($cal_y && $cal_m && checkdate($cal_m, 1, $cal_y)) {
 384                 if($cal_y == $now['year'] && $cal_m == $now['mon']) {
 385                     $form->timestart = make_timestamp($cal_y, $cal_m, $now['mday'], 0, 0, 0);
 386                 }
 387                 else {
 388                     $form->timestart = make_timestamp($cal_y, $cal_m, 1, 0, 0, 0);
 389                 }
 390             }
 391             if(!isset($form->timestart) or $form->timestart < 0) {
 392                 $form->timestart = time();
 393             }
 394
 395             calendar_get_allowed_types($allowed);
 396             if(!$allowed->groups && !$allowed->courses && !$allowed->site) {
 397                 // Take the shortcut
 398                 $eventtype = 'user';
 399             }
 400
 401             $header = '';
 402
 403             switch($eventtype) {
 404                 case 'user':
 405                     $form->name = '';
 406                     $form->description = '';
 407                     $form->courseid = 0;
 408                     $form->groupid = 0;
 409                     $form->userid = $USER->id;
 410                     $form->modulename = '';
 411                     $form->eventtype = '';
 412                     $form->instance = 0;
 413                     $form->timeduration = 0;
 414                     $form->duration = 0;
 415                     $form->repeat = 0;
 416                     $form->repeats = '';
 417                     $form->minutes = '';
 418                     $form->type = 'user';
 419                     $header = get_string('typeuser', 'calendar');
 420                 break;
 421                 case 'group':
 422                     $groupid = optional_param('groupid', 0, PARAM_INT);
 423                     if (! ($group = groups_get_group($groupid))) { //TODO:check.
 424                         calendar_get_allowed_types($allowed);
 425                         $eventtype = 'select';
 426                     }
 427                     else {
 428                         $form->name = '';
 429                         $form->description = '';
 430                         $form->courseid = $group->courseid;
 431                         $form->groupid = $group->id;
 432                         $form->userid = $USER->id;
 433                         $form->modulename = '';
 434                         $form->eventtype = '';
 435                         $form->instance = 0;
 436                         $form->timeduration = 0;
 437                         $form->duration = 0;
 438                         $form->repeat = 0;
 439                         $form->repeats = '';
 440                         $form->minutes = '';
 441                         $form->type = 'group';
 442                         $header = get_string('typegroup', 'calendar');
 443                     }
 444                 break;
 445                 case 'course':
 446                     $courseid = optional_param('courseid', 0, PARAM_INT);
 447                     if(!record_exists('course', 'id', $courseid)) {
 448                         calendar_get_allowed_types($allowed);
 449                         $eventtype = 'select';
 450                     }
 451                     else {
 452                         $form->name = '';
 453                         $form->description = '';
 454                         $form->courseid = $courseid;
 455                         $form->groupid = 0;
 456                         $form->userid = $USER->id;
 457                         $form->modulename = '';
 458                         $form->eventtype = '';
 459                         $form->instance = 0;
 460                         $form->timeduration = 0;
 461                         $form->duration = 0;
 462                         $form->repeat = 0;
 463                         $form->repeats = '';
 464                         $form->minutes = '';
 465                         $form->type = 'course';
 466                         $header = get_string('typecourse', 'calendar');
 467                     }
 468                 break;
 469                 case 'site':
 470                     $form->name = '';
 471                     $form->description = '';
 472                     $form->courseid = SITEID;
 473                     $form->groupid = 0;
 474                     $form->userid = $USER->id;
 475                     $form->modulename = '';
 476                     $form->eventtype = '';
 477                     $form->instance = 0;
 478                     $form->timeduration = 0;
 479                     $form->duration = 0;
 480                     $form->repeat = 0;
 481                     $form->repeats = '';
 482                     $form->minutes = '';
 483                     $form->type = 'site';
 484                     $header = get_string('typesite', 'calendar');
 485                 break;
 486                 case 'select':
 487                 break;
 488                 default:
 489                     error('Unsupported event type');
 490             }
 491
 492             $form->format = $defaultformat;
 493             if(!empty($header)) {
 494                 $header = ' ('.$header.')';
 495             }
 496
 497             echo '<div class="header">'.get_string('newevent', 'calendar').$header.'</div>';
 498
 499             if($eventtype == 'select') {
 500                 $courseid = optional_param('courseid', $SESSION->cal_course_referer, PARAM_INT);
 501                 if ($courseid == 0) { // workaround by Dan for bug #6130
 502                     $courseid = SITEID;
 503                 }
 504                 if (!$course = get_record('course', 'id', $courseid)) {
 505                     error('Incorrect course ID');
 506                 }
 507                 if ($groupmode = groupmode($course)) {   // Groups are being used
 508                     $changegroup = optional_param('group', -1, PARAM_INT);
 509                     $groupid = get_and_set_current_group($course, $groupmode, $changegroup);
 510                 } else {
 511                     $groupid = 0;
 512                 }
 513
 514                 echo '<h2>'.get_string('eventkind', 'calendar').':</h2>';
 515                 echo '<div id="selecteventtype">';
 516                 include('event_select.html');
 517                 echo '</div>';
 518             }
 519             else {
 520                 include('event_new.html');
 521                 if ($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, $defaultcourses);
 534     list($prevmon, $prevyr) = calendar_sub_month($mon, $yr);
 535     list($nextmon, $nextyr) = calendar_add_month($mon, $yr);
 536
 537     echo '<td class="sidecalendar">';
 538     echo '<div class="sideblock">';
 539     echo '<div class="header">'.get_string('eventskey', 'calendar').'</div>';
 540     echo '<div class="filters">';
 541     echo calendar_filter_controls('event', 'action='.$action.'&amp;type='.$eventtype.'&amp;id='.$eventid);
 542     echo '</div>';
 543     echo '</div>';
 544
 545     echo '<div class="sideblock">';
 546     echo '<div class="header">'.get_string('monthlyview', 'calendar').'</div>';
 547     echo '<div class="minicalendarblock minicalendartop">';
 548     echo calendar_top_controls('display', array('id' => $urlcourse, 'm' => $prevmon, 'y' => $prevyr));
 549     echo calendar_get_mini($courses, $groups, $users, $prevmon, $prevyr);
 550     echo '</div><div class="minicalendarblock">';
 551     echo calendar_top_controls('display', array('id' => $urlcourse, 'm' => $mon, 'y' => $yr));
 552     echo calendar_get_mini($courses, $groups, $users, $mon, $yr);
 553     echo '</div><div class="minicalendarblock">';
 554     echo calendar_top_controls('display', array('id' => $urlcourse, 'm' => $nextmon, 'y' => $nextyr));
 555     echo calendar_get_mini($courses, $groups, $users, $nextmon, $nextyr);
 556     echo '</div>';
 557     echo '</div>';
 558
 559     echo '</td>';
 560     echo '</tr></table>';
 561
 562     print_footer();
 563
 564
 565 function validate_form(&$form, &$err) {
 566
 567     $form->name = trim($form->name);
 568     $form->description = trim($form->description);
 569
 570     if(empty($form->name)) {
 571         $err['name'] = get_string('errornoeventname', 'calendar');
 572     }
 573 /* Allow events without a description
 574     if(empty($form->description)) {
 575         $err['description'] = get_string('errornodescription', 'calendar');
 576     }
 577 */
 578     if(!checkdate($form->startmon, $form->startday, $form->startyr)) {
 579         $err['timestart'] = get_string('errorinvaliddate', 'calendar');
 580     }
 581     if($form->duration == 2 and !checkdate($form->endmon, $form->endday, $form->endyr)) {
 582         $err['timeduration'] = get_string('errorinvaliddate', 'calendar');
 583     }
 584     if($form->duration == 2 and !($form->minutes > 0 and $form->minutes < 1000)) {
 585         $err['minutes'] = get_string('errorinvalidminutes', 'calendar');
 586     }
 587     if (!empty($form->repeat) and !($form->repeats > 1 and $form->repeats < 100)) {
 588         $err['repeats'] = get_string('errorinvalidrepeats', 'calendar');
 589     }
 590     if(!empty($form->courseid)) {
 591         // Timestamps must be >= course startdate
 592         $course = get_record('course', 'id', $form->courseid);
 593         if($course === false) {
 594             error('Event belongs to invalid course');
 595         }
 596         else if($form->timestart < $course->startdate) {
 597             $err['timestart'] = get_string('errorbeforecoursestart', 'calendar');
 598         }
 599     }
 600 }
 601
 602 function calendar_add_event_allowed($event) {
 603     global $USER;
 604
 605     // can not be using guest account
 606     if (empty($USER->id) or $USER->username == 'guest') {
 607         return false;
 608     }
 609
 610     $sitecontext = get_context_instance(CONTEXT_SYSTEM);
 611     // if user has manageentries at site level, always return true
 612     if (has_capability('moodle/calendar:manageentries', $sitecontext)) {
 613         return true;
 614     }
 615
 616     switch ($event->type) {
 617         case 'course':
 618             return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $event->courseid));
 619
 620         case 'group':
 621             if (! groups_group_exists($event->groupid)) { //TODO:check.
 622                 return false;
 623             }
 624             // this is ok because if you have this capability at course level, you should be able
 625             // to edit group calendar too
 626             // there is no need to check membership, because if you have this capability
 627             // you will have a role in this group context
 628             return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_GROUP, $event->groupid));
 629
 630         case 'user':
 631             if ($event->userid == $USER->id) {
 632                 return (has_capability('moodle/calendar:manageownentries', $sitecontext));
 633             }
 634             //there is no 'break;' intentionally
 635
 636         case 'site':
 637             return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, SITEID));
 638
 639         default:
 640             return false;
 641     }
 642 }
 643 ?>