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moodle/lib/grouplib.php

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @package core_group
*/
defined('MOODLE_INTERNAL') || die();
/**
* Groups not used in course or activity
*/
define('NOGROUPS', 0);
/**
* Groups used, users do not see other groups
*/
define('SEPARATEGROUPS', 1);
/**
* Groups used, students see other groups
*/
define('VISIBLEGROUPS', 2);
/**
* Determines if a group with a given groupid exists.
*
* @category group
* @param int $groupid The groupid to check for
* @return bool True if the group exists, false otherwise or if an error
* occurred.
*/
function groups_group_exists($groupid) {
global $DB;
return $DB->record_exists('groups', array('id'=>$groupid));
}
/**
* Gets the name of a group with a specified id
*
* @category group
* @param int $groupid The id of the group
* @return string The name of the group
*/
function groups_get_group_name($groupid) {
global $DB;
return $DB->get_field('groups', 'name', array('id'=>$groupid));
}
/**
* Gets the name of a grouping with a specified id
*
* @category group
* @param int $groupingid The id of the grouping
* @return string The name of the grouping
*/
function groups_get_grouping_name($groupingid) {
global $DB;
return $DB->get_field('groupings', 'name', array('id'=>$groupingid));
}
/**
* Returns the groupid of a group with the name specified for the course.
* Group names should be unique in course
*
* @category group
* @param int $courseid The id of the course
* @param string $name name of group (without magic quotes)
* @return int $groupid
*/
function groups_get_group_by_name($courseid, $name) {
global $DB;
if ($groups = $DB->get_records('groups', array('courseid'=>$courseid, 'name'=>$name))) {
return key($groups);
}
return false;
}
/**
* Returns the groupid of a group with the idnumber specified for the course.
* Group idnumbers should be unique within course
*
* @category group
* @param int $courseid The id of the course
* @param string $idnumber idnumber of group
* @return group object
*/
function groups_get_group_by_idnumber($courseid, $idnumber) {
global $DB;
if (empty($idnumber)) {
return false;
} else if ($group = $DB->get_record('groups', array('courseid' => $courseid, 'idnumber' => $idnumber))) {
return $group;
}
return false;
}
/**
* Returns the groupingid of a grouping with the name specified for the course.
* Grouping names should be unique in course
*
* @category group
* @param int $courseid The id of the course
* @param string $name name of group (without magic quotes)
* @return int $groupid
*/
function groups_get_grouping_by_name($courseid, $name) {
global $DB;
if ($groupings = $DB->get_records('groupings', array('courseid'=>$courseid, 'name'=>$name))) {
return key($groupings);
}
return false;
}
/**
* Returns the groupingid of a grouping with the idnumber specified for the course.
* Grouping names should be unique within course
*
* @category group
* @param int $courseid The id of the course
* @param string $idnumber idnumber of the group
* @return grouping object
*/
function groups_get_grouping_by_idnumber($courseid, $idnumber) {
global $DB;
if (empty($idnumber)) {
return false;
} else if ($grouping = $DB->get_record('groupings', array('courseid' => $courseid, 'idnumber' => $idnumber))) {
return $grouping;
}
return false;
}
/**
* Get the group object
*
* @category group
* @param int $groupid ID of the group.
* @param string $fields (default is all fields)
* @param int $strictness (IGNORE_MISSING - default)
* @return stdGlass group object
*/
function groups_get_group($groupid, $fields='*', $strictness=IGNORE_MISSING) {
global $DB;
return $DB->get_record('groups', array('id'=>$groupid), $fields, $strictness);
}
/**
* Get the grouping object
*
* @category group
* @param int $groupingid ID of the group.
* @param string $fields
* @param int $strictness (IGNORE_MISSING - default)
* @return stdClass group object
*/
function groups_get_grouping($groupingid, $fields='*', $strictness=IGNORE_MISSING) {
global $DB;
return $DB->get_record('groupings', array('id'=>$groupingid), $fields, $strictness);
}
/**
* Gets array of all groups in a specified course.
*
* @category group
* @param int $courseid The id of the course.
* @param mixed $userid optional user id or array of ids, returns only groups of the user.
* @param int $groupingid optional returns only groups in the specified grouping.
* @param string $fields
* @return array Returns an array of the group objects (userid field returned if array in $userid)
*/
function groups_get_all_groups($courseid, $userid=0, $groupingid=0, $fields='g.*') {
global $DB;
if (empty($userid)) {
$userfrom = "";
$userwhere = "";
$params = array();
} else {
list($usql, $params) = $DB->get_in_or_equal($userid);
$userfrom = ", {groups_members} gm";
$userwhere = "AND g.id = gm.groupid AND gm.userid $usql";
}
if (!empty($groupingid)) {
$groupingfrom = ", {groupings_groups} gg";
$groupingwhere = "AND g.id = gg.groupid AND gg.groupingid = ?";
$params[] = $groupingid;
} else {
$groupingfrom = "";
$groupingwhere = "";
}
array_unshift($params, $courseid);
return $DB->get_records_sql("SELECT $fields
FROM {groups} g $userfrom $groupingfrom
WHERE g.courseid = ? $userwhere $groupingwhere
ORDER BY name ASC", $params);
}
/**
* Returns info about user's groups in course.
*
* @category group
* @param int $courseid
* @param int $userid $USER if not specified
* @return array Array[groupingid][groupid] including grouping id 0 which means all groups
*/
function groups_get_user_groups($courseid, $userid=0) {
global $USER, $DB;
if (empty($userid)) {
$userid = $USER->id;
}
$sql = "SELECT g.id, gg.groupingid
FROM {groups} g
JOIN {groups_members} gm ON gm.groupid = g.id
LEFT JOIN {groupings_groups} gg ON gg.groupid = g.id
WHERE gm.userid = ? AND g.courseid = ?";
$params = array($userid, $courseid);
$rs = $DB->get_recordset_sql($sql, $params);
if (!$rs->valid()) {
$rs->close(); // Not going to iterate (but exit), close rs
return array('0' => array());
}
$result = array();
$allgroups = array();
foreach ($rs as $group) {
$allgroups[$group->id] = $group->id;
if (is_null($group->groupingid)) {
continue;
}
if (!array_key_exists($group->groupingid, $result)) {
$result[$group->groupingid] = array();
}
$result[$group->groupingid][$group->id] = $group->id;
}
$rs->close();
$result['0'] = array_keys($allgroups); // all groups
return $result;
}
/**
* Gets an array of all groupings in a specified course. This value is cached
* for a single course (so you can call it repeatedly for the same course
* without a performance penalty).
*
* @category group
* @param int $courseid return all groupings from course with this courseid
* @return array Returns an array of the grouping objects (empty if none)
*/
function groups_get_all_groupings($courseid) {
global $CFG, $DB, $GROUPLIB_CACHE;
// Use cached data if available. (Note: We only cache a single request, so
// as not to waste memory if processing is happening for multiple courses.)
if (!empty($GROUPLIB_CACHE->groupings) &&
$GROUPLIB_CACHE->groupings->courseid == $courseid) {
return $GROUPLIB_CACHE->groupings->result;
}
if (empty($GROUPLIB_CACHE)) {
$GROUPLIB_CACHE = new stdClass();
}
$GROUPLIB_CACHE->groupings = new stdClass();
$GROUPLIB_CACHE->groupings->courseid = $courseid;
$GROUPLIB_CACHE->groupings->result =
$DB->get_records('groupings', array('courseid' => $courseid), 'name ASC');
return $GROUPLIB_CACHE->groupings->result;
}
/**
* Determines if the user is a member of the given group.
*
* If $userid is null, use the global object.
*
* @category group
* @param int $groupid The group to check for membership.
* @param int $userid The user to check against the group.
* @return bool True if the user is a member, false otherwise.
*/
function groups_is_member($groupid, $userid=null) {
global $USER, $DB;
if (!$userid) {
$userid = $USER->id;
}
return $DB->record_exists('groups_members', array('groupid'=>$groupid, 'userid'=>$userid));
}
/**
* Determines if current or specified is member of any active group in activity
*
* @category group
* @staticvar array $cache
* @param cm_info $cm course module object
* @param int $userid id of user, null means $USER->id
* @return bool true if user member of at least one group used in activity
*/
function groups_has_membership($cm, $userid=null) {
global $CFG, $USER, $DB;
static $cache = array();
if (empty($userid)) {
$userid = $USER->id;
}
$cachekey = $userid.'|'.$cm->course.'|'.$cm->groupingid;
if (isset($cache[$cachekey])) {
return($cache[$cachekey]);
}
if ($cm->groupingid) {
// find out if member of any group in selected activity grouping
$sql = "SELECT 'x'
FROM {groups_members} gm, {groupings_groups} gg
WHERE gm.userid = ? AND gm.groupid = gg.groupid AND gg.groupingid = ?";
$params = array($userid, $cm->groupingid);
} else {
// no grouping used - check all groups in course
$sql = "SELECT 'x'
FROM {groups_members} gm, {groups} g
WHERE gm.userid = ? AND gm.groupid = g.id AND g.courseid = ?";
$params = array($userid, $cm->course);
}
$cache[$cachekey] = $DB->record_exists_sql($sql, $params);
return $cache[$cachekey];
}
/**
* Returns the users in the specified group.
*
* @category group
* @param int $groupid The groupid to get the users for
* @param int $fields The fields to return
* @param int $sort optional sorting of returned users
* @return array|bool Returns an array of the users for the specified
* group or false if no users or an error returned.
*/
function groups_get_members($groupid, $fields='u.*', $sort='lastname ASC') {
global $DB;
return $DB->get_records_sql("SELECT $fields
FROM {user} u, {groups_members} gm
WHERE u.id = gm.userid AND gm.groupid = ?
ORDER BY $sort", array($groupid));
}
/**
* Returns the users in the specified grouping.
*
* @category group
* @param int $groupingid The groupingid to get the users for
* @param string $fields The fields to return
* @param string $sort optional sorting of returned users
* @return array|bool Returns an array of the users for the specified
* group or false if no users or an error returned.
*/
function groups_get_grouping_members($groupingid, $fields='u.*', $sort='lastname ASC') {
global $DB;
return $DB->get_records_sql("SELECT $fields
FROM {user} u
INNER JOIN {groups_members} gm ON u.id = gm.userid
INNER JOIN {groupings_groups} gg ON gm.groupid = gg.groupid
WHERE gg.groupingid = ?
ORDER BY $sort", array($groupingid));
}
/**
* Returns effective groupmode used in course
*
* @category group
* @param stdClass $course course object.
* @return int group mode
*/
function groups_get_course_groupmode($course) {
return $course->groupmode;
}
/**
* Returns effective groupmode used in activity, course setting
* overrides activity setting if groupmodeforce enabled.
*
* @category group
* @param cm_info $cm the course module object. Only the ->course and ->groupmode need to be set.
* @param stdClass $course object optional course object to improve perf
* @return int group mode
*/
function groups_get_activity_groupmode($cm, $course=null) {
global $COURSE, $DB;
// get course object (reuse COURSE if possible)
if (isset($course->id) and $course->id == $cm->course) {
//ok
} else if ($cm->course == $COURSE->id) {
$course = $COURSE;
} else {
if (!$course = $DB->get_record('course', array('id'=>$cm->course))) {
print_error('invalidcourseid');
}
}
return empty($course->groupmodeforce) ? $cm->groupmode : $course->groupmode;
}
/**
* Print group menu selector for course level.
*
* @category group
* @param stdClass $course course object
* @param mixed $urlroot return address. Accepts either a string or a moodle_url
* @param bool $return return as string instead of printing
* @return mixed void or string depending on $return param
*/
function groups_print_course_menu($course, $urlroot, $return=false) {
global $USER, $OUTPUT;
if (!$groupmode = $course->groupmode) {
if ($return) {
return '';
} else {
return;
}
}
$context = context_course::instance($course->id);
$aag = has_capability('moodle/site:accessallgroups', $context);
if ($groupmode == VISIBLEGROUPS or $aag) {
$allowedgroups = groups_get_all_groups($course->id, 0, $course->defaultgroupingid);
} else {
$allowedgroups = groups_get_all_groups($course->id, $USER->id, $course->defaultgroupingid);
}
$activegroup = groups_get_course_group($course, true, $allowedgroups);
$groupsmenu = array();
if (!$allowedgroups or $groupmode == VISIBLEGROUPS or $aag) {
$groupsmenu[0] = get_string('allparticipants');
}
if ($allowedgroups) {
foreach ($allowedgroups as $group) {
$groupsmenu[$group->id] = format_string($group->name);
}
}
if ($groupmode == VISIBLEGROUPS) {
$grouplabel = get_string('groupsvisible');
} else {
$grouplabel = get_string('groupsseparate');
}
if ($aag and $course->defaultgroupingid) {
if ($grouping = groups_get_grouping($course->defaultgroupingid)) {
$grouplabel = $grouplabel . ' (' . format_string($grouping->name) . ')';
}
}
if (count($groupsmenu) == 1) {
$groupname = reset($groupsmenu);
$output = $grouplabel.': '.$groupname;
} else {
$select = new single_select(new moodle_url($urlroot), 'group', $groupsmenu, $activegroup, null, 'selectgroup');
$select->label = $grouplabel;
$output = $OUTPUT->render($select);
}
$output = '<div class="groupselector">'.$output.'</div>';
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Print group menu selector for activity.
*
* @category group
* @param stdClass $cm course module object
* @param string|moodle_url $urlroot return address that users get to if they choose an option;
* should include any parameters needed, e.g. "$CFG->wwwroot/mod/forum/view.php?id=34"
* @param bool $return return as string instead of printing
* @param bool $hideallparticipants If true, this prevents the 'All participants'
* option from appearing in cases where it normally would. This is intended for
* use only by activities that cannot display all groups together. (Note that
* selecting this option does not prevent groups_get_activity_group from
* returning 0; it will still do that if the user has chosen 'all participants'
* in another activity, or not chosen anything.)
* @return mixed void or string depending on $return param
*/
function groups_print_activity_menu($cm, $urlroot, $return=false, $hideallparticipants=false) {
global $USER, $OUTPUT;
if ($urlroot instanceof moodle_url) {
// no changes necessary
} else {
if (strpos($urlroot, 'http') !== 0) { // Will also work for https
// Display error if urlroot is not absolute (this causes the non-JS version to break)
debugging('groups_print_activity_menu requires absolute URL for ' .
'$urlroot, not <tt>' . s($urlroot) . '</tt>. Example: ' .
'groups_print_activity_menu($cm, $CFG->wwwroot . \'/mod/mymodule/view.php?id=13\');',
DEBUG_DEVELOPER);
}
$urlroot = new moodle_url($urlroot);
}
if (!$groupmode = groups_get_activity_groupmode($cm)) {
if ($return) {
return '';
} else {
return;
}
}
$context = context_module::instance($cm->id);
$aag = has_capability('moodle/site:accessallgroups', $context);
if ($groupmode == VISIBLEGROUPS or $aag) {
$allowedgroups = groups_get_all_groups($cm->course, 0, $cm->groupingid); // any group in grouping
} else {
$allowedgroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid); // only assigned groups
}
$activegroup = groups_get_activity_group($cm, true, $allowedgroups);
$groupsmenu = array();
if ((!$allowedgroups or $groupmode == VISIBLEGROUPS or $aag) and !$hideallparticipants) {
$groupsmenu[0] = get_string('allparticipants');
}
if ($allowedgroups) {
foreach ($allowedgroups as $group) {
$groupsmenu[$group->id] = format_string($group->name);
}
}
if ($groupmode == VISIBLEGROUPS) {
$grouplabel = get_string('groupsvisible');
} else {
$grouplabel = get_string('groupsseparate');
}
if ($aag and $cm->groupingid) {
if ($grouping = groups_get_grouping($cm->groupingid)) {
$grouplabel = $grouplabel . ' (' . format_string($grouping->name) . ')';
}
}
if (count($groupsmenu) == 1) {
$groupname = reset($groupsmenu);
$output = $grouplabel.': '.$groupname;
} else {
$select = new single_select($urlroot, 'group', $groupsmenu, $activegroup, null, 'selectgroup');
$select->label = $grouplabel;
$output = $OUTPUT->render($select);
}
$output = '<div class="groupselector">'.$output.'</div>';
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Returns group active in course, changes the group by default if 'group' page param present
*
* @category group
* @param stdClass $course course bject
* @param bool $update change active group if group param submitted
* @param array $allowedgroups list of groups user may access (INTERNAL, to be used only from groups_print_course_menu())
* @return mixed false if groups not used, int if groups used, 0 means all groups (access must be verified in SEPARATE mode)
*/
function groups_get_course_group($course, $update=false, $allowedgroups=null) {
global $USER, $SESSION;
if (!$groupmode = $course->groupmode) {
// NOGROUPS used
return false;
}
$context = context_course::instance($course->id);
if (has_capability('moodle/site:accessallgroups', $context)) {
$groupmode = 'aag';
}
if (!is_array($allowedgroups)) {
if ($groupmode == VISIBLEGROUPS or $groupmode === 'aag') {
$allowedgroups = groups_get_all_groups($course->id, 0, $course->defaultgroupingid);
} else {
$allowedgroups = groups_get_all_groups($course->id, $USER->id, $course->defaultgroupingid);
}
}
_group_verify_activegroup($course->id, $groupmode, $course->defaultgroupingid, $allowedgroups);
// set new active group if requested
$changegroup = optional_param('group', -1, PARAM_INT);
if ($update and $changegroup != -1) {
if ($changegroup == 0) {
// do not allow changing to all groups without accessallgroups capability
if ($groupmode == VISIBLEGROUPS or $groupmode === 'aag') {
$SESSION->activegroup[$course->id][$groupmode][$course->defaultgroupingid] = 0;
}
} else {
if ($allowedgroups and array_key_exists($changegroup, $allowedgroups)) {
$SESSION->activegroup[$course->id][$groupmode][$course->defaultgroupingid] = $changegroup;
}
}
}
return $SESSION->activegroup[$course->id][$groupmode][$course->defaultgroupingid];
}
/**
* Returns group active in activity, changes the group by default if 'group' page param present
*
* @category group
* @param stdClass $cm course module object
* @param bool $update change active group if group param submitted
* @param array $allowedgroups list of groups user may access (INTERNAL, to be used only from groups_print_activity_menu())
* @return mixed false if groups not used, int if groups used, 0 means all groups (access must be verified in SEPARATE mode)
*/
function groups_get_activity_group($cm, $update=false, $allowedgroups=null) {
global $USER, $SESSION;
if (!$groupmode = groups_get_activity_groupmode($cm)) {
// NOGROUPS used
return false;
}
$context = context_module::instance($cm->id);
if (has_capability('moodle/site:accessallgroups', $context)) {
$groupmode = 'aag';
}
if (!is_array($allowedgroups)) {
if ($groupmode == VISIBLEGROUPS or $groupmode === 'aag') {
$allowedgroups = groups_get_all_groups($cm->course, 0, $cm->groupingid);
} else {
$allowedgroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid);
}
}
_group_verify_activegroup($cm->course, $groupmode, $cm->groupingid, $allowedgroups);
// set new active group if requested
$changegroup = optional_param('group', -1, PARAM_INT);
if ($update and $changegroup != -1) {
if ($changegroup == 0) {
// allgroups visible only in VISIBLEGROUPS or when accessallgroups
if ($groupmode == VISIBLEGROUPS or $groupmode === 'aag') {
$SESSION->activegroup[$cm->course][$groupmode][$cm->groupingid] = 0;
}
} else {
if ($allowedgroups and array_key_exists($changegroup, $allowedgroups)) {
$SESSION->activegroup[$cm->course][$groupmode][$cm->groupingid] = $changegroup;
}
}
}
return $SESSION->activegroup[$cm->course][$groupmode][$cm->groupingid];
}
/**
* Gets a list of groups that the user is allowed to access within the
* specified activity.
*
* @category group
* @param stdClass $cm Course-module
* @param int $userid User ID (defaults to current user)
* @return array An array of group objects, or false if none
*/
function groups_get_activity_allowed_groups($cm,$userid=0) {
// Use current user by default
global $USER;
if(!$userid) {
$userid=$USER->id;
}
// Get groupmode for activity, taking into account course settings
$groupmode=groups_get_activity_groupmode($cm);
// If visible groups mode, or user has the accessallgroups capability,
// then they can access all groups for the activity...
$context = context_module::instance($cm->id);
if ($groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $context)) {
return groups_get_all_groups($cm->course, 0, $cm->groupingid);
} else {
// ...otherwise they can only access groups they belong to
return groups_get_all_groups($cm->course, $userid, $cm->groupingid);
}
}
/**
* Determine if a course module is currently visible to a user
*
* $USER If $userid is null, use the global object.
*
* @category group
* @param stdClass $cm The course module
* @param int $userid The user to check against the group.
* @return bool True if the user can view the course module, false otherwise.
*/
function groups_course_module_visible($cm, $userid=null) {
global $CFG, $USER;
if (empty($userid)) {
$userid = $USER->id;
}
if (empty($CFG->enablegroupmembersonly)) {
return true;
}
if (empty($cm->groupmembersonly)) {
return true;
}
if (has_capability('moodle/site:accessallgroups', context_module::instance($cm->id), $userid) or groups_has_membership($cm, $userid)) {
return true;
}
return false;
}
/**
* Internal method, sets up $SESSION->activegroup and verifies previous value
*
* @param int $courseid
* @param int|string $groupmode SEPARATEGROUPS, VISIBLEGROUPS or 'aag' (access all groups)
* @param int $groupingid 0 means all groups
* @param array $allowedgroups list of groups user can see
*/
function _group_verify_activegroup($courseid, $groupmode, $groupingid, array $allowedgroups) {
global $SESSION, $USER;
// init activegroup array if necessary
if (!isset($SESSION->activegroup)) {
$SESSION->activegroup = array();
}
if (!array_key_exists($courseid, $SESSION->activegroup)) {
$SESSION->activegroup[$courseid] = array(SEPARATEGROUPS=>array(), VISIBLEGROUPS=>array(), 'aag'=>array());
}
// make sure that the current group info is ok
if (array_key_exists($groupingid, $SESSION->activegroup[$courseid][$groupmode]) and !array_key_exists($SESSION->activegroup[$courseid][$groupmode][$groupingid], $allowedgroups)) {
// active group does not exist anymore or is 0
if ($SESSION->activegroup[$courseid][$groupmode][$groupingid] > 0 or $groupmode == SEPARATEGROUPS) {
// do not do this if all groups selected and groupmode is not separate
unset($SESSION->activegroup[$courseid][$groupmode][$groupingid]);
}
}
// set up defaults if necessary
if (!array_key_exists($groupingid, $SESSION->activegroup[$courseid][$groupmode])) {
if ($groupmode == 'aag') {
$SESSION->activegroup[$courseid][$groupmode][$groupingid] = 0; // all groups by default if user has accessallgroups
} else if ($allowedgroups) {
if ($groupmode != SEPARATEGROUPS and $mygroups = groups_get_all_groups($courseid, $USER->id, $groupingid)) {
$firstgroup = reset($mygroups);
} else {
$firstgroup = reset($allowedgroups);
}
$SESSION->activegroup[$courseid][$groupmode][$groupingid] = $firstgroup->id;
} else {
// this happen when user not assigned into group in SEPARATEGROUPS mode or groups do not exist yet
// mod authors must add extra checks for this when SEPARATEGROUPS mode used (such as when posting to forum)
$SESSION->activegroup[$courseid][$groupmode][$groupingid] = 0;
}
}
}
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