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File: grouplib.php
<?php //$Id: grouplib.php,v 1.22.2.10 2009/11/30 17:18:44 sam_marshall Exp $ /** * 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. * @param int $groupid The groupid to check for * @return boolean True if the group exists, false otherwise or if an error * occurred. */ function groups_group_exists($groupid) { return record_exists('groups', 'id', $groupid); } /** * Gets the name of a group with a specified id * @param int $groupid The id of the group * @return string The name of the group */ function groups_get_group_name($groupid) { return get_field('groups', 'name', 'id', $groupid); } /** * Gets the name of a grouping with a specified id * @param int $groupingid The id of the grouping * @return string The name of the grouping */ function groups_get_grouping_name($groupingid) { return get_field('groupings', 'name', 'id', $groupingid); } /** * Returns the groupid of a group with the name specified for the course. * Group names should be unique in course * @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, $name) { if ($groups = get_records_select('groups', "courseid=$courseid AND name='".addslashes($name)."'")) { return key($groups); } return false; } /** * Returns the groupingid of a grouping with the name specified for the course. * Grouping names should be unique in course * @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, $name) { if ($groupings = get_records_select('groupings', "courseid=$courseid AND name='".addslashes($name)."'")) { return key($groupings); } return false; } /** * Get the group object * @param groupid ID of the group. * @return group object */ function groups_get_group($groupid) { return get_record('groups', 'id', $groupid); } /** * Get the grouping object * @param groupingid ID of the group. * @return group object */ function groups_get_grouping($groupingid) { return get_record('groupings', 'id', $groupingid); } /** * Gets array of all groups in a specified course. * @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. * @return array | false Returns an array of the group objects or false if no records * or an error occurred. (userid field returned if array in $userid) */ function groups_get_all_groups($courseid, $userid=0, $groupingid=0, $fields='g.*') { global $CFG; // groupings are ignored when not enabled if (empty($CFG->enablegroupings)) { $groupingid = 0; } if (empty($userid)) { $userfrom = ""; $userwhere = ""; } else if (is_array($userid)) { $userids = implode(',', $userid); $userfrom = ", {$CFG->prefix}groups_members gm"; $userwhere = "AND g.id = gm.groupid AND gm.userid IN ($userids)"; } else { $userfrom = ", {$CFG->prefix}groups_members gm"; $userwhere = "AND g.id = gm.groupid AND gm.userid = '$userid'"; } if (!empty($groupingid)) { $groupingfrom = ", {$CFG->prefix}groupings_groups gg"; $groupingwhere = "AND g.id = gg.groupid AND gg.groupingid = '$groupingid'"; } else { $groupingfrom = ""; $groupingwhere = ""; } return get_records_sql("SELECT $fields FROM {$CFG->prefix}groups g $userfrom $groupingfrom WHERE g.courseid = $courseid $userwhere $groupingwhere ORDER BY name ASC"); } /** * Returns info about user's groups in course. * @param int $courseid * @param int $userid $USER if not specified * @return array[groupingid][groupid] including grouping id 0 which means all groups */ function groups_get_user_groups($courseid, $userid=0) { global $CFG, $USER; if (empty($userid)) { $userid = $USER->id; } if (!$rs = get_recordset_sql("SELECT g.id, gg.groupingid FROM {$CFG->prefix}groups g JOIN {$CFG->prefix}groups_members gm ON gm.groupid = g.id LEFT JOIN {$CFG->prefix}groupings_groups gg ON gg.groupid = g.id WHERE gm.userid = $userid AND g.courseid = $courseid")) { return array('0' => array()); } $result = array(); $allgroups = array(); while ($group = rs_fetch_next_record($rs)) { $allgroups[$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] = $group->id; } rs_close($rs); $result['0'] = array_keys($allgroups); // all groups return $result; } /** * Gets array of all groupings in a specified course. * @param int $courseid return only groupings in this with this courseid * @return array | false Returns an array of the grouping objects or false if no records * or an error occurred. */ function groups_get_all_groupings($courseid) { global $CFG; // groupings are ignored when not enabled if (empty($CFG->enablegroupings)) { return(false); } return get_records_sql("SELECT * FROM {$CFG->prefix}groupings WHERE courseid = $courseid ORDER BY name ASC"); } /** * Determines if the user is a member of the given group. * * @uses $USER If $userid is null, use the global object. * @param int $groupid The group to check for membership. * @param int $userid The user to check against the group. * @return boolean True if the user is a member, false otherwise. */ function groups_is_member($groupid, $userid=null) { global $USER; if (!$userid) { $userid = $USER->id; } return record_exists('groups_members', 'groupid', $groupid, 'userid', $userid); } /** * Determines if current or specified is member of any active group in activity * @param object $cm coruse module object * @param int $userid id of user, null menas $USER->id * @return booelan true if user member of at least one group used in activity */ function groups_has_membership($cm, $userid=null) { global $CFG, $USER; static $cache = array(); // groupings are ignored when not enabled if (empty($CFG->enablegroupings)) { $cm->groupingid = 0; } if (empty($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 $sql = "SELECT 'x' FROM {$CFG->prefix}groups_members gm, {$CFG->prefix}groupings_groups gg WHERE gm.userid = $userid AND gm.groupid = gg.groupid AND gg.groupingid = {$cm->groupingid}"; } else { // no grouping used - check all groups in course $sql = "SELECT 'x' FROM {$CFG->prefix}groups_members gm, {$CFG->prefix}groups g WHERE gm.userid = $userid AND gm.groupid = g.id AND g.courseid = {$cm->course}"; } $cache[$cachekey] = record_exists_sql($sql); return $cache[$cachekey]; } /** * Returns the users in the specified group. * @param int $groupid The groupid to get the users for * @param int $fields The fields to return * @param int $sort optional sorting of returned users * @return array | false Returns an array of the users for the specified * group or false if no users or an error returned. */ function groups_get_members($groupid, $fields='u.*', $sort='lastname ASC') { global $CFG; return get_records_sql("SELECT $fields FROM {$CFG->prefix}user u, {$CFG->prefix}groups_members gm WHERE u.id = gm.userid AND gm.groupid = '$groupid' ORDER BY $sort"); } /** * Returns the users in the specified grouping. * @param int $groupingid The groupingid to get the users for * @param int $fields The fields to return * @param int $sort optional sorting of returned users * @return array | false Returns an array of the users for the specified * group or false if no users or an error returned. */ function groups_get_grouping_members($groupingid, $fields='u.*', $sort='lastname ASC') { global $CFG; return get_records_sql("SELECT $fields FROM {$CFG->prefix}user u INNER JOIN {$CFG->prefix}groups_members gm ON u.id = gm.userid INNER JOIN {$CFG->prefix}groupings_groups gg ON gm.groupid = gg.groupid WHERE gg.groupingid = $groupingid ORDER BY $sort"); } /** * Returns effective groupmode used in course * @return integer group mode */ function groups_get_course_groupmode($course) { return $course->groupmode; } /** * Returns effective groupmode used in activity, course setting * overrides activity setting if groupmodeforce enabled. * @param $cm the course module object. Only the ->course and ->groupmode need to be set. * @param $course object optional course object to improve perf * @return integer group mode */ function groups_get_activity_groupmode($cm, $course=null) { global $COURSE; // get course object (reuse COURSE if possible) if (isset($course->id) and $course->id == $cm->course) { //ok } else if ($cm->course == $COURSE->id) { $course = $COURSE; } else { if (!$course = get_record('course', 'id', $cm->course)) { error('Incorrect course id in cm'); } } return empty($course->groupmodeforce) ? $cm->groupmode : $course->groupmode; } /** * Print group menu selector for course level. * @param object $course course object * @param string $urlroot return address * @param boolean $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 $CFG, $USER, $SESSION; if (!$groupmode = $course->groupmode) { if ($return) { return ''; } else { return; } } $context = get_context_instance(CONTEXT_COURSE, $course->id); if ($groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $context)) { $allowedgroups = groups_get_all_groups($course->id, 0, $course->defaultgroupingid); // detect changes related to groups and fix active group if (!empty($SESSION->activegroup[$course->id][VISIBLEGROUPS][0])) { if (!array_key_exists($SESSION->activegroup[$course->id][VISIBLEGROUPS][0], $allowedgroups)) { // active does not exist anymore unset($SESSION->activegroup[$course->id][VISIBLEGROUPS][0]); } } if (!empty($SESSION->activegroup[$course->id]['aag'][0])) { if (!array_key_exists($SESSION->activegroup[$course->id]['aag'][0], $allowedgroups)) { // active group does not exist anymore unset($SESSION->activegroup[$course->id]['aag'][0]); } } } else { $allowedgroups = groups_get_all_groups($course->id, $USER->id, $course->defaultgroupingid); // detect changes related to groups and fix active group if (isset($SESSION->activegroup[$course->id][SEPARATEGROUPS][0])) { if ($SESSION->activegroup[$course->id][SEPARATEGROUPS][0] == 0) { if ($allowedgroups) { // somebody must have assigned at least one group, we can select it now - yay! unset($SESSION->activegroup[$course->id][SEPARATEGROUPS][0]); } } else { if (!array_key_exists($SESSION->activegroup[$course->id][SEPARATEGROUPS][0], $allowedgroups)) { // active group not allowed or does not exist anymore unset($SESSION->activegroup[$course->id][SEPARATEGROUPS][0]); } } } } $activegroup = groups_get_course_group($course, true); $groupsmenu = array(); if (!$allowedgroups or $groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $context)) { $groupsmenu[0] = get_string('allparticipants'); } if ($allowedgroups) { foreach ($allowedgroups as $group) { $groupsmenu[$group->id] = format_string($group->name); } } if ($groupmode == VISIBLEGROUPS) { $grouplabel = get_string('groupsvisible'); } else { $grouplabel = get_string('groupsseparate'); } if (count($groupsmenu) == 1) { $groupname = reset($groupsmenu); $output = $grouplabel.': '.$groupname; } else { $output = popup_form($urlroot.'&group=', $groupsmenu, 'selectgroup', $activegroup, '', '', '', true, 'self', $grouplabel); } $output = '<div class="groupselector">'.$output.'</div>'; if ($return) { return $output; } else { echo $output; } } /** * Print group menu selector for activity. * @param object $cm course module object * @param string $urlroot return address that users get to if they choose an option; * should include any parameters needed, e.g. "$CFG->wwwroot/mod/forum/view.php?id=34" * @param boolean $return return as string instead of printing * @param boolean $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 $CFG, $USER, $SESSION; // Display error if urlroot is not absolute (this causes the non-JS version // to break) if (strpos($urlroot, 'http') !== 0) { // Will also work for https debugging('groups_print_activity_menu requires absolute URL for ' . '$urlroot, not <tt>' . s($urlroot) . '</tt>. Example: ' . 'groups_print_activity_menu($cm, $CFG->wwwroot . \'/mod/mymodule/view.php?id=13\');', DEBUG_DEVELOPER); } // groupings are ignored when not enabled if (empty($CFG->enablegroupings)) { $cm->groupingid = 0; } if (!$groupmode = groups_get_activity_groupmode($cm)) { if ($return) { return ''; } else { return; } } $context = get_context_instance(CONTEXT_MODULE, $cm->id); if ($groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $context)) { $allowedgroups = groups_get_all_groups($cm->course, 0, $cm->groupingid); // any group in grouping (all if groupings not used) // detect changes related to groups and fix active group if (!empty($SESSION->activegroup[$cm->course][VISIBLEGROUPS][$cm->groupingid])) { if (!array_key_exists($SESSION->activegroup[$cm->course][VISIBLEGROUPS][$cm->groupingid], $allowedgroups)) { // active group does not exist anymore unset($SESSION->activegroup[$cm->course][VISIBLEGROUPS][$cm->groupingid]); } } if (!empty($SESSION->activegroup[$cm->course]['aag'][$cm->groupingid])) { if (!array_key_exists($SESSION->activegroup[$cm->course]['aag'][$cm->groupingid], $allowedgroups)) { // active group does not exist anymore unset($SESSION->activegroup[$cm->course]['aag'][$cm->groupingid]); } } } else { $allowedgroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid); // only assigned groups // detect changes related to groups and fix active group if (isset($SESSION->activegroup[$cm->course][SEPARATEGROUPS][$cm->groupingid])) { if ($SESSION->activegroup[$cm->course][SEPARATEGROUPS][$cm->groupingid] == 0) { if ($allowedgroups) { // somebody must have assigned at least one group, we can select it now - yay! unset($SESSION->activegroup[$cm->course][SEPARATEGROUPS][$cm->groupingid]); } } else { if (!array_key_exists($SESSION->activegroup[$cm->course][SEPARATEGROUPS][$cm->groupingid], $allowedgroups)) { // active group not allowed or does not exist anymore unset($SESSION->activegroup[$cm->course][SEPARATEGROUPS][$cm->groupingid]); } } } } $activegroup = groups_get_activity_group($cm, true); $groupsmenu = array(); if ((!$allowedgroups or $groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $context)) and !$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 { $grouplabel = get_string('groupsseparate'); } if (count($groupsmenu) == 1) { $groupname = reset($groupsmenu); $output = $grouplabel.': '.$groupname; } else { $output = popup_form($urlroot.'&group=', $groupsmenu, 'selectgroup', $activegroup, '', '', '', true, 'self', $grouplabel); } $output = '<div class="groupselector">'.$output.'</div>'; if ($return) { return $output; } else { echo $output; } } /** * Returns group active in course, changes the group by default if 'group' page param present * * @param object $course course bject * @param boolean $update change active group if group param submitted * @return mixed false if groups not used, int if groups used, 0 means all groups (access must be verified in SEPARATE mode) */ function groups_get_course_group($course, $update=false) { global $CFG, $USER, $SESSION; if (!$groupmode = $course->groupmode) { // NOGROUPS used return false; } // init activegroup array if (!array_key_exists('activegroup', $SESSION)) { $SESSION->activegroup = array(); } if (!array_key_exists($course->id, $SESSION->activegroup)) { $SESSION->activegroup[$course->id] = array(SEPARATEGROUPS=>array(), VISIBLEGROUPS=>array(), 'aag'=>array()); } $context = get_context_instance(CONTEXT_COURSE, $course->id); if (has_capability('moodle/site:accessallgroups', $context)) { $groupmode = 'aag'; } // grouping used the first time - add first user group as default if (!array_key_exists(0, $SESSION->activegroup[$course->id][$groupmode])) { if ($groupmode == 'aag') { $SESSION->activegroup[$course->id][$groupmode][0] = 0; // all groups by default if user has accessallgroups } else if ($usergroups = groups_get_all_groups($course->id, $USER->id, $course->defaultgroupingid)) { $fistgroup = reset($usergroups); $SESSION->activegroup[$course->id][$groupmode][0] = $fistgroup->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) $SESSION->activegroup[$course->id][$groupmode][0] = 0; } } // 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][$groupmode][0] = 0; } } else { // first make list of allowed groups if ($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, $course->defaultgroupingid); } if ($allowedgroups and array_key_exists($changegroup, $allowedgroups)) { $SESSION->activegroup[$course->id][$groupmode][0] = $changegroup; } } } return $SESSION->activegroup[$course->id][$groupmode][0]; } /** * Returns group active in activity, changes the group by default if 'group' page param present * * @param object $cm course module object * @param boolean $update change active group if group param submitted * @return mixed false if groups not used, int if groups used, 0 means all groups (access must be verified in SEPARATE mode) */ function groups_get_activity_group($cm, $update=false) { global $CFG, $USER, $SESSION; // groupings are ignored when not enabled if (empty($CFG->enablegroupings)) { $cm->groupingid = 0; } if (!$groupmode = groups_get_activity_groupmode($cm)) { // NOGROUPS used return false; } // init activegroup array if (!array_key_exists('activegroup', $SESSION)) { $SESSION->activegroup = array(); } if (!array_key_exists($cm->course, $SESSION->activegroup)) { $SESSION->activegroup[$cm->course] = array(SEPARATEGROUPS=>array(), VISIBLEGROUPS=>array(), 'aag'=>array()); } $context = get_context_instance(CONTEXT_MODULE, $cm->id); if (has_capability('moodle/site:accessallgroups', $context)) { $groupmode = 'aag'; } // grouping used the first time - add first user group as default if (!array_key_exists($cm->groupingid, $SESSION->activegroup[$cm->course][$groupmode])) { if ($groupmode == 'aag') { $SESSION->activegroup[$cm->course][$groupmode][$cm->groupingid] = 0; // all groups by default if user has accessallgroups } else if ($usergroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid)) { $fistgroup = reset($usergroups); $SESSION->activegroup[$cm->course][$groupmode][$cm->groupingid] = $fistgroup->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) $SESSION->activegroup[$cm->course][$groupmode][$cm->groupingid] = 0; } } // 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 { // first make list of allowed groups if ($groupmode == VISIBLEGROUPS or $groupmode == 'aag') { $allowedgroups = groups_get_all_groups($cm->course, 0, $cm->groupingid); // any group in grouping (all if groupings not used) } else { $allowedgroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid); // only assigned groups } if ($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. * @param object $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 = get_context_instance(CONTEXT_MODULE, $cm->id); if ($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 * @uses $USER If $userid is null, use the global object. * @param int $cm The course module * @param int $userid The user to check against the group. * @return boolean True if the user can view the course module, false otherwise. */ function groups_course_module_visible($cm, $userid=null) { global $CFG, $USER; if (empty($userid)) { $userid = $USER->id; } if (empty($CFG->enablegroupings)) { return true; } if (empty($cm->groupmembersonly)) { return true; } if (has_capability('moodle/site:accessallgroups', get_context_instance(CONTEXT_MODULE, $cm->id), $userid) or groups_has_membership($cm, $userid)) { return true; } return false; } ?>
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