group/lib.php

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