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See Release Notes
Long Term Support Release

  • Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
  • Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
  • PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.
/group/ -> lib.php (source)

Differences Between: [Versions 310 and 401] [Versions 39 and 401] [Versions 401 and 402] [Versions 401 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  
  18  /**
  19   * Extra library for groups and groupings.
  20   *
  21   * @copyright 2006 The Open University, J.White AT open.ac.uk, Petr Skoda (skodak)
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   * @package   core_group
  24   */
  25  
  26  /*
  27   * INTERNAL FUNCTIONS - to be used by moodle core only
  28   * require_once $CFG->dirroot.'/group/lib.php' must be used
  29   */
  30  
  31  /**
  32   * Adds a specified user to a group
  33   *
  34   * @param mixed $grouporid  The group id or group object
  35   * @param mixed $userorid   The user id or user object
  36   * @param string $component Optional component name e.g. 'enrol_imsenterprise'
  37   * @param int $itemid Optional itemid associated with component
  38   * @return bool True if user added successfully or the user is already a
  39   * member of the group, false otherwise.
  40   */
  41  function groups_add_member($grouporid, $userorid, $component=null, $itemid=0) {
  42      global $DB;
  43  
  44      if (is_object($userorid)) {
  45          $userid = $userorid->id;
  46          $user   = $userorid;
  47          if (!isset($user->deleted)) {
  48              $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
  49          }
  50      } else {
  51          $userid = $userorid;
  52          $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
  53      }
  54  
  55      if ($user->deleted) {
  56          return false;
  57      }
  58  
  59      if (is_object($grouporid)) {
  60          $groupid = $grouporid->id;
  61          $group   = $grouporid;
  62      } else {
  63          $groupid = $grouporid;
  64          $group = $DB->get_record('groups', array('id'=>$groupid), '*', MUST_EXIST);
  65      }
  66  
  67      // Check if the user a participant of the group course.
  68      $context = context_course::instance($group->courseid);
  69      if (!is_enrolled($context, $userid)) {
  70          return false;
  71      }
  72  
  73      if (groups_is_member($groupid, $userid)) {
  74          return true;
  75      }
  76  
  77      $member = new stdClass();
  78      $member->groupid   = $groupid;
  79      $member->userid    = $userid;
  80      $member->timeadded = time();
  81      $member->component = '';
  82      $member->itemid = 0;
  83  
  84      // Check the component exists if specified
  85      if (!empty($component)) {
  86          $dir = core_component::get_component_directory($component);
  87          if ($dir && is_dir($dir)) {
  88              // Component exists and can be used
  89              $member->component = $component;
  90              $member->itemid = $itemid;
  91          } else {
  92              throw new coding_exception('Invalid call to groups_add_member(). An invalid component was specified');
  93          }
  94      }
  95  
  96      if ($itemid !== 0 && empty($member->component)) {
  97          // An itemid can only be specified if a valid component was found
  98          throw new coding_exception('Invalid call to groups_add_member(). A component must be specified if an itemid is given');
  99      }
 100  
 101      $DB->insert_record('groups_members', $member);
 102  
 103      // Update group info, and group object.
 104      $DB->set_field('groups', 'timemodified', $member->timeadded, array('id'=>$groupid));
 105      $group->timemodified = $member->timeadded;
 106  
 107      // Invalidate the group and grouping cache for users.
 108      cache_helper::invalidate_by_definition('core', 'user_group_groupings', array(), array($userid));
 109  
 110      // Group conversation messaging.
 111      if ($conversation = \core_message\api::get_conversation_by_area('core_group', 'groups', $groupid, $context->id)) {
 112          \core_message\api::add_members_to_conversation([$userid], $conversation->id);
 113      }
 114  
 115      // Trigger group event.
 116      $params = array(
 117          'context' => $context,
 118          'objectid' => $groupid,
 119          'relateduserid' => $userid,
 120          'other' => array(
 121              'component' => $member->component,
 122              'itemid' => $member->itemid
 123          )
 124      );
 125      $event = \core\event\group_member_added::create($params);
 126      $event->add_record_snapshot('groups', $group);
 127      $event->trigger();
 128  
 129      return true;
 130  }
 131  
 132  /**
 133   * Checks whether the current user is permitted (using the normal UI) to
 134   * remove a specific group member, assuming that they have access to remove
 135   * group members in general.
 136   *
 137   * For automatically-created group member entries, this checks with the
 138   * relevant plugin to see whether it is permitted. The default, if the plugin
 139   * doesn't provide a function, is true.
 140   *
 141   * For other entries (and any which have already been deleted/don't exist) it
 142   * just returns true.
 143   *
 144   * @param mixed $grouporid The group id or group object
 145   * @param mixed $userorid The user id or user object
 146   * @return bool True if permitted, false otherwise
 147   */
 148  function groups_remove_member_allowed($grouporid, $userorid) {
 149      global $DB;
 150  
 151      if (is_object($userorid)) {
 152          $userid = $userorid->id;
 153      } else {
 154          $userid = $userorid;
 155      }
 156      if (is_object($grouporid)) {
 157          $groupid = $grouporid->id;
 158      } else {
 159          $groupid = $grouporid;
 160      }
 161  
 162      // Get entry
 163      if (!($entry = $DB->get_record('groups_members',
 164              array('groupid' => $groupid, 'userid' => $userid), '*', IGNORE_MISSING))) {
 165          // If the entry does not exist, they are allowed to remove it (this
 166          // is consistent with groups_remove_member below).
 167          return true;
 168      }
 169  
 170      // If the entry does not have a component value, they can remove it
 171      if (empty($entry->component)) {
 172          return true;
 173      }
 174  
 175      // It has a component value, so we need to call a plugin function (if it
 176      // exists); the default is to allow removal
 177      return component_callback($entry->component, 'allow_group_member_remove',
 178              array($entry->itemid, $entry->groupid, $entry->userid), true);
 179  }
 180  
 181  /**
 182   * Deletes the link between the specified user and group.
 183   *
 184   * @param mixed $grouporid  The group id or group object
 185   * @param mixed $userorid   The user id or user object
 186   * @return bool True if deletion was successful, false otherwise
 187   */
 188  function groups_remove_member($grouporid, $userorid) {
 189      global $DB;
 190  
 191      if (is_object($userorid)) {
 192          $userid = $userorid->id;
 193      } else {
 194          $userid = $userorid;
 195      }
 196  
 197      if (is_object($grouporid)) {
 198          $groupid = $grouporid->id;
 199          $group   = $grouporid;
 200      } else {
 201          $groupid = $grouporid;
 202          $group = $DB->get_record('groups', array('id'=>$groupid), '*', MUST_EXIST);
 203      }
 204  
 205      if (!groups_is_member($groupid, $userid)) {
 206          return true;
 207      }
 208  
 209      $DB->delete_records('groups_members', array('groupid'=>$groupid, 'userid'=>$userid));
 210  
 211      // Update group info.
 212      $time = time();
 213      $DB->set_field('groups', 'timemodified', $time, array('id' => $groupid));
 214      $group->timemodified = $time;
 215  
 216      // Invalidate the group and grouping cache for users.
 217      cache_helper::invalidate_by_definition('core', 'user_group_groupings', array(), array($userid));
 218  
 219      // Group conversation messaging.
 220      $context = context_course::instance($group->courseid);
 221      if ($conversation = \core_message\api::get_conversation_by_area('core_group', 'groups', $groupid, $context->id)) {
 222          \core_message\api::remove_members_from_conversation([$userid], $conversation->id);
 223      }
 224  
 225      // Trigger group event.
 226      $params = array(
 227          'context' => context_course::instance($group->courseid),
 228          'objectid' => $groupid,
 229          'relateduserid' => $userid
 230      );
 231      $event = \core\event\group_member_removed::create($params);
 232      $event->add_record_snapshot('groups', $group);
 233      $event->trigger();
 234  
 235      return true;
 236  }
 237  
 238  /**
 239   * Add a new group
 240   *
 241   * @param stdClass $data group properties
 242   * @param stdClass $editform
 243   * @param array $editoroptions
 244   * @return id of group or false if error
 245   */
 246  function groups_create_group($data, $editform = false, $editoroptions = false) {
 247      global $CFG, $DB, $USER;
 248  
 249      //check that courseid exists
 250      $course = $DB->get_record('course', array('id' => $data->courseid), '*', MUST_EXIST);
 251      $context = context_course::instance($course->id);
 252  
 253      $data->timecreated  = time();
 254      $data->timemodified = $data->timecreated;
 255      $data->name         = trim($data->name);
 256      if (isset($data->idnumber)) {
 257          $data->idnumber = trim($data->idnumber);
 258          if (groups_get_group_by_idnumber($course->id, $data->idnumber)) {
 259              throw new moodle_exception('idnumbertaken');
 260          }
 261      }
 262  
 263      if ($editform and $editoroptions) {
 264          $data->description = $data->description_editor['text'];
 265          $data->descriptionformat = $data->description_editor['format'];
 266      }
 267  
 268      $data->id = $DB->insert_record('groups', $data);
 269  
 270      if ($editform and $editoroptions) {
 271          // Update description from editor with fixed files
 272          $data = file_postupdate_standard_editor($data, 'description', $editoroptions, $context, 'group', 'description', $data->id);
 273          $upd = new stdClass();
 274          $upd->id                = $data->id;
 275          $upd->description       = $data->description;
 276          $upd->descriptionformat = $data->descriptionformat;
 277          $DB->update_record('groups', $upd);
 278      }
 279  
 280      $group = $DB->get_record('groups', array('id'=>$data->id));
 281  
 282      if ($editform) {
 283          groups_update_group_icon($group, $data, $editform);
 284      }
 285  
 286      // Invalidate the grouping cache for the course
 287      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($course->id));
 288  
 289      // Group conversation messaging.
 290      if (\core_message\api::can_create_group_conversation($USER->id, $context)) {
 291          if (!empty($data->enablemessaging)) {
 292              \core_message\api::create_conversation(
 293                  \core_message\api::MESSAGE_CONVERSATION_TYPE_GROUP,
 294                  [],
 295                  $group->name,
 296                  \core_message\api::MESSAGE_CONVERSATION_ENABLED,
 297                  'core_group',
 298                  'groups',
 299                  $group->id,
 300                  $context->id);
 301          }
 302      }
 303  
 304      // Trigger group event.
 305      $params = array(
 306          'context' => $context,
 307          'objectid' => $group->id
 308      );
 309      $event = \core\event\group_created::create($params);
 310      $event->add_record_snapshot('groups', $group);
 311      $event->trigger();
 312  
 313      return $group->id;
 314  }
 315  
 316  /**
 317   * Add a new grouping
 318   *
 319   * @param stdClass $data grouping properties
 320   * @param array $editoroptions
 321   * @return id of grouping or false if error
 322   */
 323  function groups_create_grouping($data, $editoroptions=null) {
 324      global $DB;
 325  
 326      $data->timecreated  = time();
 327      $data->timemodified = $data->timecreated;
 328      $data->name         = trim($data->name);
 329      if (isset($data->idnumber)) {
 330          $data->idnumber = trim($data->idnumber);
 331          if (groups_get_grouping_by_idnumber($data->courseid, $data->idnumber)) {
 332              throw new moodle_exception('idnumbertaken');
 333          }
 334      }
 335  
 336      if ($editoroptions !== null) {
 337          $data->description = $data->description_editor['text'];
 338          $data->descriptionformat = $data->description_editor['format'];
 339      }
 340  
 341      $id = $DB->insert_record('groupings', $data);
 342      $data->id = $id;
 343  
 344      if ($editoroptions !== null) {
 345          $description = new stdClass;
 346          $description->id = $data->id;
 347          $description->description_editor = $data->description_editor;
 348          $description = file_postupdate_standard_editor($description, 'description', $editoroptions, $editoroptions['context'], 'grouping', 'description', $description->id);
 349          $DB->update_record('groupings', $description);
 350      }
 351  
 352      // Invalidate the grouping cache for the course
 353      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($data->courseid));
 354  
 355      // Trigger group event.
 356      $params = array(
 357          'context' => context_course::instance($data->courseid),
 358          'objectid' => $id
 359      );
 360      $event = \core\event\grouping_created::create($params);
 361      $event->trigger();
 362  
 363      return $id;
 364  }
 365  
 366  /**
 367   * Update the group icon from form data
 368   *
 369   * @param stdClass $group group information
 370   * @param stdClass $data
 371   * @param stdClass $editform
 372   */
 373  function groups_update_group_icon($group, $data, $editform) {
 374      global $CFG, $DB;
 375      require_once("$CFG->libdir/gdlib.php");
 376  
 377      $fs = get_file_storage();
 378      $context = context_course::instance($group->courseid, MUST_EXIST);
 379      $newpicture = $group->picture;
 380  
 381      if (!empty($data->deletepicture)) {
 382          $fs->delete_area_files($context->id, 'group', 'icon', $group->id);
 383          $newpicture = 0;
 384      } else if ($iconfile = $editform->save_temp_file('imagefile')) {
 385          if ($rev = process_new_icon($context, 'group', 'icon', $group->id, $iconfile)) {
 386              $newpicture = $rev;
 387          } else {
 388              $fs->delete_area_files($context->id, 'group', 'icon', $group->id);
 389              $newpicture = 0;
 390          }
 391          @unlink($iconfile);
 392      }
 393  
 394      if ($newpicture != $group->picture) {
 395          $DB->set_field('groups', 'picture', $newpicture, array('id' => $group->id));
 396          $group->picture = $newpicture;
 397  
 398          // Invalidate the group data as we've updated the group record.
 399          cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($group->courseid));
 400      }
 401  }
 402  
 403  /**
 404   * Update group
 405   *
 406   * @param stdClass $data group properties (with magic quotes)
 407   * @param stdClass $editform
 408   * @param array $editoroptions
 409   * @return bool true or exception
 410   */
 411  function groups_update_group($data, $editform = false, $editoroptions = false) {
 412      global $CFG, $DB, $USER;
 413  
 414      $context = context_course::instance($data->courseid);
 415  
 416      $data->timemodified = time();
 417      if (isset($data->name)) {
 418          $data->name = trim($data->name);
 419      }
 420      if (isset($data->idnumber)) {
 421          $data->idnumber = trim($data->idnumber);
 422          if (($existing = groups_get_group_by_idnumber($data->courseid, $data->idnumber)) && $existing->id != $data->id) {
 423              throw new moodle_exception('idnumbertaken');
 424          }
 425      }
 426  
 427      if ($editform and $editoroptions) {
 428          $data = file_postupdate_standard_editor($data, 'description', $editoroptions, $context, 'group', 'description', $data->id);
 429      }
 430  
 431      $DB->update_record('groups', $data);
 432  
 433      // Invalidate the group data.
 434      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($data->courseid));
 435  
 436      $group = $DB->get_record('groups', array('id'=>$data->id));
 437  
 438      if ($editform) {
 439          groups_update_group_icon($group, $data, $editform);
 440      }
 441  
 442      // Group conversation messaging.
 443      if (\core_message\api::can_create_group_conversation($USER->id, $context)) {
 444          if ($conversation = \core_message\api::get_conversation_by_area('core_group', 'groups', $group->id, $context->id)) {
 445              if ($data->enablemessaging && $data->enablemessaging != $conversation->enabled) {
 446                  \core_message\api::enable_conversation($conversation->id);
 447              }
 448              if (!$data->enablemessaging && $data->enablemessaging != $conversation->enabled) {
 449                  \core_message\api::disable_conversation($conversation->id);
 450              }
 451              \core_message\api::update_conversation_name($conversation->id, $group->name);
 452          } else {
 453              if (!empty($data->enablemessaging)) {
 454                  $conversation = \core_message\api::create_conversation(
 455                      \core_message\api::MESSAGE_CONVERSATION_TYPE_GROUP,
 456                      [],
 457                      $group->name,
 458                      \core_message\api::MESSAGE_CONVERSATION_ENABLED,
 459                      'core_group',
 460                      'groups',
 461                      $group->id,
 462                      $context->id
 463                  );
 464  
 465                  // Add members to conversation if they exists in the group.
 466                  if ($groupmemberroles = groups_get_members_by_role($group->id, $group->courseid, 'u.id')) {
 467                      $users = [];
 468                      foreach ($groupmemberroles as $roleid => $roledata) {
 469                          foreach ($roledata->users as $member) {
 470                              $users[] = $member->id;
 471                          }
 472                      }
 473                      \core_message\api::add_members_to_conversation($users, $conversation->id);
 474                  }
 475              }
 476          }
 477      }
 478  
 479      // Trigger group event.
 480      $params = array(
 481          'context' => $context,
 482          'objectid' => $group->id
 483      );
 484      $event = \core\event\group_updated::create($params);
 485      $event->add_record_snapshot('groups', $group);
 486      $event->trigger();
 487  
 488      return true;
 489  }
 490  
 491  /**
 492   * Update grouping
 493   *
 494   * @param stdClass $data grouping properties (with magic quotes)
 495   * @param array $editoroptions
 496   * @return bool true or exception
 497   */
 498  function groups_update_grouping($data, $editoroptions=null) {
 499      global $DB;
 500      $data->timemodified = time();
 501      if (isset($data->name)) {
 502          $data->name = trim($data->name);
 503      }
 504      if (isset($data->idnumber)) {
 505          $data->idnumber = trim($data->idnumber);
 506          if (($existing = groups_get_grouping_by_idnumber($data->courseid, $data->idnumber)) && $existing->id != $data->id) {
 507              throw new moodle_exception('idnumbertaken');
 508          }
 509      }
 510      if ($editoroptions !== null) {
 511          $data = file_postupdate_standard_editor($data, 'description', $editoroptions, $editoroptions['context'], 'grouping', 'description', $data->id);
 512      }
 513      $DB->update_record('groupings', $data);
 514  
 515      // Invalidate the group data.
 516      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($data->courseid));
 517  
 518      // Trigger group event.
 519      $params = array(
 520          'context' => context_course::instance($data->courseid),
 521          'objectid' => $data->id
 522      );
 523      $event = \core\event\grouping_updated::create($params);
 524      $event->trigger();
 525  
 526      return true;
 527  }
 528  
 529  /**
 530   * Delete a group best effort, first removing members and links with courses and groupings.
 531   * Removes group avatar too.
 532   *
 533   * @param mixed $grouporid The id of group to delete or full group object
 534   * @return bool True if deletion was successful, false otherwise
 535   */
 536  function groups_delete_group($grouporid) {
 537      global $CFG, $DB;
 538      require_once("$CFG->libdir/gdlib.php");
 539  
 540      if (is_object($grouporid)) {
 541          $groupid = $grouporid->id;
 542          $group   = $grouporid;
 543      } else {
 544          $groupid = $grouporid;
 545          if (!$group = $DB->get_record('groups', array('id'=>$groupid))) {
 546              //silently ignore attempts to delete missing already deleted groups ;-)
 547              return true;
 548          }
 549      }
 550  
 551      $context = context_course::instance($group->courseid);
 552  
 553      // delete group calendar events
 554      $DB->delete_records('event', array('groupid'=>$groupid));
 555      //first delete usage in groupings_groups
 556      $DB->delete_records('groupings_groups', array('groupid'=>$groupid));
 557      //delete members
 558      $DB->delete_records('groups_members', array('groupid'=>$groupid));
 559  
 560      // Delete any members in a conversation related to this group.
 561      if ($conversation = \core_message\api::get_conversation_by_area('core_group', 'groups', $groupid, $context->id)) {
 562          \core_message\api::delete_all_conversation_data($conversation->id);
 563      }
 564  
 565      //group itself last
 566      $DB->delete_records('groups', array('id'=>$groupid));
 567  
 568      // Delete all files associated with this group
 569      $context = context_course::instance($group->courseid);
 570      $fs = get_file_storage();
 571      $fs->delete_area_files($context->id, 'group', 'description', $groupid);
 572      $fs->delete_area_files($context->id, 'group', 'icon', $groupid);
 573  
 574      // Invalidate the grouping cache for the course
 575      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($group->courseid));
 576      // Purge the group and grouping cache for users.
 577      cache_helper::purge_by_definition('core', 'user_group_groupings');
 578  
 579      // Trigger group event.
 580      $params = array(
 581          'context' => $context,
 582          'objectid' => $groupid
 583      );
 584      $event = \core\event\group_deleted::create($params);
 585      $event->add_record_snapshot('groups', $group);
 586      $event->trigger();
 587  
 588      return true;
 589  }
 590  
 591  /**
 592   * Delete grouping
 593   *
 594   * @param int $groupingorid
 595   * @return bool success
 596   */
 597  function groups_delete_grouping($groupingorid) {
 598      global $DB;
 599  
 600      if (is_object($groupingorid)) {
 601          $groupingid = $groupingorid->id;
 602          $grouping   = $groupingorid;
 603      } else {
 604          $groupingid = $groupingorid;
 605          if (!$grouping = $DB->get_record('groupings', array('id'=>$groupingorid))) {
 606              //silently ignore attempts to delete missing already deleted groupings ;-)
 607              return true;
 608          }
 609      }
 610  
 611      //first delete usage in groupings_groups
 612      $DB->delete_records('groupings_groups', array('groupingid'=>$groupingid));
 613      // remove the default groupingid from course
 614      $DB->set_field('course', 'defaultgroupingid', 0, array('defaultgroupingid'=>$groupingid));
 615      // remove the groupingid from all course modules
 616      $DB->set_field('course_modules', 'groupingid', 0, array('groupingid'=>$groupingid));
 617      //group itself last
 618      $DB->delete_records('groupings', array('id'=>$groupingid));
 619  
 620      $context = context_course::instance($grouping->courseid);
 621      $fs = get_file_storage();
 622      $files = $fs->get_area_files($context->id, 'grouping', 'description', $groupingid);
 623      foreach ($files as $file) {
 624          $file->delete();
 625      }
 626  
 627      // Invalidate the grouping cache for the course
 628      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($grouping->courseid));
 629      // Purge the group and grouping cache for users.
 630      cache_helper::purge_by_definition('core', 'user_group_groupings');
 631  
 632      // Trigger group event.
 633      $params = array(
 634          'context' => $context,
 635          'objectid' => $groupingid
 636      );
 637      $event = \core\event\grouping_deleted::create($params);
 638      $event->add_record_snapshot('groupings', $grouping);
 639      $event->trigger();
 640  
 641      return true;
 642  }
 643  
 644  /**
 645   * Remove all users (or one user) from all groups in course
 646   *
 647   * @param int $courseid
 648   * @param int $userid 0 means all users
 649   * @param bool $unused - formerly $showfeedback, is no longer used.
 650   * @return bool success
 651   */
 652  function groups_delete_group_members($courseid, $userid=0, $unused=false) {
 653      global $DB, $OUTPUT;
 654  
 655      // Get the users in the course which are in a group.
 656      $sql = "SELECT gm.id as gmid, gm.userid, g.*
 657                FROM {groups_members} gm
 658          INNER JOIN {groups} g
 659                  ON gm.groupid = g.id
 660               WHERE g.courseid = :courseid";
 661      $params = array();
 662      $params['courseid'] = $courseid;
 663      // Check if we want to delete a specific user.
 664      if ($userid) {
 665          $sql .= " AND gm.userid = :userid";
 666          $params['userid'] = $userid;
 667      }
 668      $rs = $DB->get_recordset_sql($sql, $params);
 669      foreach ($rs as $usergroup) {
 670          groups_remove_member($usergroup, $usergroup->userid);
 671      }
 672      $rs->close();
 673  
 674      return true;
 675  }
 676  
 677  /**
 678   * Remove all groups from all groupings in course
 679   *
 680   * @param int $courseid
 681   * @param bool $showfeedback
 682   * @return bool success
 683   */
 684  function groups_delete_groupings_groups($courseid, $showfeedback=false) {
 685      global $DB, $OUTPUT;
 686  
 687      $groupssql = "SELECT id FROM {groups} g WHERE g.courseid = ?";
 688      $results = $DB->get_recordset_select('groupings_groups', "groupid IN ($groupssql)",
 689          array($courseid), '', 'groupid, groupingid');
 690  
 691      foreach ($results as $result) {
 692          groups_unassign_grouping($result->groupingid, $result->groupid, false);
 693      }
 694      $results->close();
 695  
 696      // Invalidate the grouping cache for the course
 697      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
 698      // Purge the group and grouping cache for users.
 699      cache_helper::purge_by_definition('core', 'user_group_groupings');
 700  
 701      // no need to show any feedback here - we delete usually first groupings and then groups
 702  
 703      return true;
 704  }
 705  
 706  /**
 707   * Delete all groups from course
 708   *
 709   * @param int $courseid
 710   * @param bool $showfeedback
 711   * @return bool success
 712   */
 713  function groups_delete_groups($courseid, $showfeedback=false) {
 714      global $CFG, $DB, $OUTPUT;
 715  
 716      $groups = $DB->get_recordset('groups', array('courseid' => $courseid));
 717      foreach ($groups as $group) {
 718          groups_delete_group($group);
 719      }
 720      $groups->close();
 721  
 722      // Invalidate the grouping cache for the course
 723      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
 724      // Purge the group and grouping cache for users.
 725      cache_helper::purge_by_definition('core', 'user_group_groupings');
 726  
 727      if ($showfeedback) {
 728          echo $OUTPUT->notification(get_string('deleted').' - '.get_string('groups', 'group'), 'notifysuccess');
 729      }
 730  
 731      return true;
 732  }
 733  
 734  /**
 735   * Delete all groupings from course
 736   *
 737   * @param int $courseid
 738   * @param bool $showfeedback
 739   * @return bool success
 740   */
 741  function groups_delete_groupings($courseid, $showfeedback=false) {
 742      global $DB, $OUTPUT;
 743  
 744      $groupings = $DB->get_recordset_select('groupings', 'courseid = ?', array($courseid));
 745      foreach ($groupings as $grouping) {
 746          groups_delete_grouping($grouping);
 747      }
 748      $groupings->close();
 749  
 750      // Invalidate the grouping cache for the course.
 751      cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
 752      // Purge the group and grouping cache for users.
 753      cache_helper::purge_by_definition('core', 'user_group_groupings');
 754  
 755      if ($showfeedback) {
 756          echo $OUTPUT->notification(get_string('deleted').' - '.get_string('groupings', 'group'), 'notifysuccess');
 757      }
 758  
 759      return true;
 760  }
 761  
 762  /* =================================== */
 763  /* various functions used by groups UI */
 764  /* =================================== */
 765  
 766  /**
 767   * Obtains a list of the possible roles that group members might come from,
 768   * on a course. Generally this includes only profile roles.
 769   *
 770   * @param context $context Context of course
 771   * @return Array of role ID integers, or false if error/none.
 772   */
 773  function groups_get_possible_roles($context) {
 774      $roles = get_profile_roles($context);
 775      return array_keys($roles);
 776  }
 777  
 778  
 779  /**
 780   * Gets potential group members for grouping
 781   *
 782   * @param int $courseid The id of the course
 783   * @param int $roleid The role to select users from
 784   * @param mixed $source restrict to cohort, grouping or group id
 785   * @param string $orderby The column to sort users by
 786   * @param int $notingroup restrict to users not in existing groups
 787   * @param bool $onlyactiveenrolments restrict to users who have an active enrolment in the course
 788   * @param array $extrafields Extra user fields to return
 789   * @return array An array of the users
 790   */
 791  function groups_get_potential_members($courseid, $roleid = null, $source = null,
 792                                        $orderby = 'lastname ASC, firstname ASC',
 793                                        $notingroup = null, $onlyactiveenrolments = false, $extrafields = []) {
 794      global $DB;
 795  
 796      $context = context_course::instance($courseid);
 797  
 798      list($esql, $params) = get_enrolled_sql($context, '', 0, $onlyactiveenrolments);
 799  
 800      $notingroupsql = "";
 801      if ($notingroup) {
 802          // We want to eliminate users that are already associated with a course group.
 803          $notingroupsql = "u.id NOT IN (SELECT userid
 804                                           FROM {groups_members}
 805                                          WHERE groupid IN (SELECT id
 806                                                              FROM {groups}
 807                                                             WHERE courseid = :courseid))";
 808          $params['courseid'] = $courseid;
 809      }
 810  
 811      if ($roleid) {
 812          // We are looking for all users with this role assigned in this context or higher.
 813          list($relatedctxsql, $relatedctxparams) = $DB->get_in_or_equal($context->get_parent_context_ids(true),
 814                                                                         SQL_PARAMS_NAMED,
 815                                                                         'relatedctx');
 816  
 817          $params = array_merge($params, $relatedctxparams, array('roleid' => $roleid));
 818          $where = "WHERE u.id IN (SELECT userid
 819                                     FROM {role_assignments}
 820                                    WHERE roleid = :roleid AND contextid $relatedctxsql)";
 821          $where .= $notingroup ? "AND $notingroupsql" : "";
 822      } else if ($notingroup) {
 823          $where = "WHERE $notingroupsql";
 824      } else {
 825          $where = "";
 826      }
 827  
 828      $sourcejoin = "";
 829      if (is_int($source)) {
 830          $sourcejoin .= "JOIN {cohort_members} cm ON (cm.userid = u.id AND cm.cohortid = :cohortid) ";
 831          $params['cohortid'] = $source;
 832      } else {
 833          // Auto-create groups from an existing cohort membership.
 834          if (isset($source['cohortid'])) {
 835              $sourcejoin .= "JOIN {cohort_members} cm ON (cm.userid = u.id AND cm.cohortid = :cohortid) ";
 836              $params['cohortid'] = $source['cohortid'];
 837          }
 838          // Auto-create groups from an existing group membership.
 839          if (isset($source['groupid'])) {
 840              $sourcejoin .= "JOIN {groups_members} gp ON (gp.userid = u.id AND gp.groupid = :groupid) ";
 841              $params['groupid'] = $source['groupid'];
 842          }
 843          // Auto-create groups from an existing grouping membership.
 844          if (isset($source['groupingid'])) {
 845              $sourcejoin .= "JOIN {groupings_groups} gg ON gg.groupingid = :groupingid ";
 846              $sourcejoin .= "JOIN {groups_members} gm ON (gm.userid = u.id AND gm.groupid = gg.groupid) ";
 847              $params['groupingid'] = $source['groupingid'];
 848          }
 849      }
 850  
 851      $userfieldsapi = \core_user\fields::for_userpic()->including(...$extrafields);
 852      $allusernamefields = $userfieldsapi->get_sql('u', false, '', '', false)->selects;
 853      $sql = "SELECT DISTINCT u.id, u.username, $allusernamefields, u.idnumber
 854                FROM {user} u
 855                JOIN ($esql) e ON e.id = u.id
 856         $sourcejoin
 857              $where
 858            ORDER BY $orderby";
 859  
 860      return $DB->get_records_sql($sql, $params);
 861  
 862  }
 863  
 864  /**
 865   * Parse a group name for characters to replace
 866   *
 867   * @param string $format The format a group name will follow
 868   * @param int $groupnumber The number of the group to be used in the parsed format string
 869   * @return string the parsed format string
 870   */
 871  function groups_parse_name($format, $groupnumber) {
 872      if (strstr($format, '@') !== false) { // Convert $groupnumber to a character series
 873          $letter = 'A';
 874          for($i=0; $i<$groupnumber; $i++) {
 875              $letter++;
 876          }
 877          $str = str_replace('@', $letter, $format);
 878      } else {
 879          $str = str_replace('#', $groupnumber+1, $format);
 880      }
 881      return($str);
 882  }
 883  
 884  /**
 885   * Assigns group into grouping
 886   *
 887   * @param int groupingid
 888   * @param int groupid
 889   * @param int $timeadded  The time the group was added to the grouping.
 890   * @param bool $invalidatecache If set to true the course group cache and the user group cache will be invalidated as well.
 891   * @return bool true or exception
 892   */
 893  function groups_assign_grouping($groupingid, $groupid, $timeadded = null, $invalidatecache = true) {
 894      global $DB;
 895  
 896      if ($DB->record_exists('groupings_groups', array('groupingid'=>$groupingid, 'groupid'=>$groupid))) {
 897          return true;
 898      }
 899      $assign = new stdClass();
 900      $assign->groupingid = $groupingid;
 901      $assign->groupid    = $groupid;
 902      if ($timeadded != null) {
 903          $assign->timeadded = (integer)$timeadded;
 904      } else {
 905          $assign->timeadded = time();
 906      }
 907      $DB->insert_record('groupings_groups', $assign);
 908  
 909      $courseid = $DB->get_field('groupings', 'courseid', array('id' => $groupingid));
 910      if ($invalidatecache) {
 911          // Invalidate the grouping cache for the course
 912          cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
 913          // Purge the group and grouping cache for users.
 914          cache_helper::purge_by_definition('core', 'user_group_groupings');
 915      }
 916  
 917      // Trigger event.
 918      $params = array(
 919          'context' => context_course::instance($courseid),
 920          'objectid' => $groupingid,
 921          'other' => array('groupid' => $groupid)
 922      );
 923      $event = \core\event\grouping_group_assigned::create($params);
 924      $event->trigger();
 925  
 926      return true;
 927  }
 928  
 929  /**
 930   * Unassigns group from grouping
 931   *
 932   * @param int groupingid
 933   * @param int groupid
 934   * @param bool $invalidatecache If set to true the course group cache and the user group cache will be invalidated as well.
 935   * @return bool success
 936   */
 937  function groups_unassign_grouping($groupingid, $groupid, $invalidatecache = true) {
 938      global $DB;
 939      $DB->delete_records('groupings_groups', array('groupingid'=>$groupingid, 'groupid'=>$groupid));
 940  
 941      $courseid = $DB->get_field('groupings', 'courseid', array('id' => $groupingid));
 942      if ($invalidatecache) {
 943          // Invalidate the grouping cache for the course
 944          cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
 945          // Purge the group and grouping cache for users.
 946          cache_helper::purge_by_definition('core', 'user_group_groupings');
 947      }
 948  
 949      // Trigger event.
 950      $params = array(
 951          'context' => context_course::instance($courseid),
 952          'objectid' => $groupingid,
 953          'other' => array('groupid' => $groupid)
 954      );
 955      $event = \core\event\grouping_group_unassigned::create($params);
 956      $event->trigger();
 957  
 958      return true;
 959  }
 960  
 961  /**
 962   * Lists users in a group based on their role on the course.
 963   * Returns false if there's an error or there are no users in the group.
 964   * Otherwise returns an array of role ID => role data, where role data includes:
 965   * (role) $id, $shortname, $name
 966   * $users: array of objects for each user which include the specified fields
 967   * Users who do not have a role are stored in the returned array with key '-'
 968   * and pseudo-role details (including a name, 'No role'). Users with multiple
 969   * roles, same deal with key '*' and name 'Multiple roles'. You can find out
 970   * which roles each has by looking in the $roles array of the user object.
 971   *
 972   * @param int $groupid
 973   * @param int $courseid Course ID (should match the group's course)
 974   * @param string $fields List of fields from user table (prefixed with u) and joined tables, default 'u.*'
 975   * @param string|null $sort SQL ORDER BY clause, default (when null passed) is what comes from users_order_by_sql.
 976   * @param string $extrawheretest extra SQL conditions ANDed with the existing where clause.
 977   * @param array $whereorsortparams any parameters required by $extrawheretest or $joins (named parameters).
 978   * @param string $joins any joins required to get the specified fields.
 979   * @return array Complex array as described above
 980   */
 981  function groups_get_members_by_role(int $groupid, int $courseid, string $fields = 'u.*',
 982          ?string $sort = null, string $extrawheretest = '', array $whereorsortparams = [], string $joins = '') {
 983      global $DB;
 984  
 985      // Retrieve information about all users and their roles on the course or
 986      // parent ('related') contexts
 987      $context = context_course::instance($courseid);
 988  
 989      // We are looking for all users with this role assigned in this context or higher.
 990      list($relatedctxsql, $relatedctxparams) = $DB->get_in_or_equal($context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'relatedctx');
 991  
 992      if ($extrawheretest) {
 993          $extrawheretest = ' AND ' . $extrawheretest;
 994      }
 995  
 996      if (is_null($sort)) {
 997          list($sort, $sortparams) = users_order_by_sql('u');
 998          $whereorsortparams = array_merge($whereorsortparams, $sortparams);
 999      }
1000  
1001      $sql = "SELECT r.id AS roleid, u.id AS userid, $fields
1002                FROM {groups_members} gm
1003                JOIN {user} u ON u.id = gm.userid
1004           LEFT JOIN {role_assignments} ra ON (ra.userid = u.id AND ra.contextid $relatedctxsql)
1005           LEFT JOIN {role} r ON r.id = ra.roleid
1006                     $joins
1007               WHERE gm.groupid=:mgroupid
1008                     ".$extrawheretest."
1009            ORDER BY r.sortorder, $sort";
1010      $whereorsortparams = array_merge($whereorsortparams, $relatedctxparams, array('mgroupid' => $groupid));
1011      $rs = $DB->get_recordset_sql($sql, $whereorsortparams);
1012  
1013      return groups_calculate_role_people($rs, $context);
1014  }
1015  
1016  /**
1017   * Internal function used by groups_get_members_by_role to handle the
1018   * results of a database query that includes a list of users and possible
1019   * roles on a course.
1020   *
1021   * @param moodle_recordset $rs The record set (may be false)
1022   * @param int $context ID of course context
1023   * @return array As described in groups_get_members_by_role
1024   */
1025  function groups_calculate_role_people($rs, $context) {
1026      global $CFG, $DB;
1027  
1028      if (!$rs) {
1029          return array();
1030      }
1031  
1032      $allroles = role_fix_names(get_all_roles($context), $context);
1033      $visibleroles = get_viewable_roles($context);
1034  
1035      // Array of all involved roles
1036      $roles = array();
1037      // Array of all retrieved users
1038      $users = array();
1039      // Fill arrays
1040      foreach ($rs as $rec) {
1041          // Create information about user if this is a new one
1042          if (!array_key_exists($rec->userid, $users)) {
1043              // User data includes all the optional fields, but not any of the
1044              // stuff we added to get the role details
1045              $userdata = clone($rec);
1046              unset($userdata->roleid);
1047              unset($userdata->roleshortname);
1048              unset($userdata->rolename);
1049              unset($userdata->userid);
1050              $userdata->id = $rec->userid;
1051  
1052              // Make an array to hold the list of roles for this user
1053              $userdata->roles = array();
1054              $users[$rec->userid] = $userdata;
1055          }
1056          // If user has a role...
1057          if (!is_null($rec->roleid)) {
1058              // Create information about role if this is a new one
1059              if (!array_key_exists($rec->roleid, $roles)) {
1060                  $role = $allroles[$rec->roleid];
1061                  $roledata = new stdClass();
1062                  $roledata->id        = $role->id;
1063                  $roledata->shortname = $role->shortname;
1064                  $roledata->name      = $role->localname;
1065                  $roledata->users = array();
1066                  $roles[$roledata->id] = $roledata;
1067              }
1068              // Record that user has role
1069              $users[$rec->userid]->roles[$rec->roleid] = $roles[$rec->roleid];
1070          }
1071      }
1072      $rs->close();
1073  
1074      // Return false if there weren't any users
1075      if (count($users) == 0) {
1076          return false;
1077      }
1078  
1079      // Add pseudo-role for multiple roles
1080      $roledata = new stdClass();
1081      $roledata->name = get_string('multipleroles','role');
1082      $roledata->users = array();
1083      $roles['*'] = $roledata;
1084  
1085      $roledata = new stdClass();
1086      $roledata->name = get_string('noroles','role');
1087      $roledata->users = array();
1088      $roles[0] = $roledata;
1089  
1090      // Now we rearrange the data to store users by role
1091      foreach ($users as $userid=>$userdata) {
1092          $visibleuserroles = array_intersect_key($userdata->roles, $visibleroles);
1093          $rolecount = count($visibleuserroles);
1094          if ($rolecount == 0) {
1095              // does not have any roles
1096              $roleid = 0;
1097          } else if($rolecount > 1) {
1098              $roleid = '*';
1099          } else {
1100              $userrole = reset($visibleuserroles);
1101              $roleid = $userrole->id;
1102          }
1103          $roles[$roleid]->users[$userid] = $userdata;
1104      }
1105  
1106      // Delete roles not used
1107      foreach ($roles as $key=>$roledata) {
1108          if (count($roledata->users)===0) {
1109              unset($roles[$key]);
1110          }
1111      }
1112  
1113      // Return list of roles containing their users
1114      return $roles;
1115  }
1116  
1117  /**
1118   * Synchronises enrolments with the group membership
1119   *
1120   * Designed for enrolment methods provide automatic synchronisation between enrolled users
1121   * and group membership, such as enrol_cohort and enrol_meta .
1122   *
1123   * @param string $enrolname name of enrolment method without prefix
1124   * @param int $courseid course id where sync needs to be performed (0 for all courses)
1125   * @param string $gidfield name of the field in 'enrol' table that stores group id
1126   * @return array Returns the list of removed and added users. Each record contains fields:
1127   *                  userid, enrolid, courseid, groupid, groupname
1128   */
1129  function groups_sync_with_enrolment($enrolname, $courseid = 0, $gidfield = 'customint2') {
1130      global $DB;
1131      $onecourse = $courseid ? "AND e.courseid = :courseid" : "";
1132      $params = array(
1133          'enrolname' => $enrolname,
1134          'component' => 'enrol_'.$enrolname,
1135          'courseid' => $courseid
1136      );
1137  
1138      $affectedusers = array(
1139          'removed' => array(),
1140          'added' => array()
1141      );
1142  
1143      // Remove invalid.
1144      $sql = "SELECT ue.userid, ue.enrolid, e.courseid, g.id AS groupid, g.name AS groupname
1145                FROM {groups_members} gm
1146                JOIN {groups} g ON (g.id = gm.groupid)
1147                JOIN {enrol} e ON (e.enrol = :enrolname AND e.courseid = g.courseid $onecourse)
1148                JOIN {user_enrolments} ue ON (ue.userid = gm.userid AND ue.enrolid = e.id)
1149               WHERE gm.component=:component AND gm.itemid = e.id AND g.id <> e.{$gidfield}";
1150  
1151      $rs = $DB->get_recordset_sql($sql, $params);
1152      foreach ($rs as $gm) {
1153          groups_remove_member($gm->groupid, $gm->userid);
1154          $affectedusers['removed'][] = $gm;
1155      }
1156      $rs->close();
1157  
1158      // Add missing.
1159      $sql = "SELECT ue.userid, ue.enrolid, e.courseid, g.id AS groupid, g.name AS groupname
1160                FROM {user_enrolments} ue
1161                JOIN {enrol} e ON (e.id = ue.enrolid AND e.enrol = :enrolname $onecourse)
1162                JOIN {groups} g ON (g.courseid = e.courseid AND g.id = e.{$gidfield})
1163                JOIN {user} u ON (u.id = ue.userid AND u.deleted = 0)
1164           LEFT JOIN {groups_members} gm ON (gm.groupid = g.id AND gm.userid = ue.userid)
1165               WHERE gm.id IS NULL";
1166  
1167      $rs = $DB->get_recordset_sql($sql, $params);
1168      foreach ($rs as $ue) {
1169          groups_add_member($ue->groupid, $ue->userid, 'enrol_'.$enrolname, $ue->enrolid);
1170          $affectedusers['added'][] = $ue;
1171      }
1172      $rs->close();
1173  
1174      return $affectedusers;
1175  }
1176  
1177  /**
1178   * Callback for inplace editable API.
1179   *
1180   * @param string $itemtype - Only user_groups is supported.
1181   * @param string $itemid - Userid and groupid separated by a :
1182   * @param string $newvalue - json encoded list of groupids.
1183   * @return \core\output\inplace_editable
1184   */
1185  function core_group_inplace_editable($itemtype, $itemid, $newvalue) {
1186      if ($itemtype === 'user_groups') {
1187          return \core_group\output\user_groups_editable::update($itemid, $newvalue);
1188      }
1189  }