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400 lines
15 KiB
400 lines
15 KiB
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Privacy Subsystem implementation for core_group.
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*
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* @package core_group
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* @category privacy
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* @copyright 2018 Shamim Rezaie <shamim@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core_group\privacy;
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defined('MOODLE_INTERNAL') || die();
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use core_privacy\local\metadata\collection;
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use core_privacy\local\request\approved_contextlist;
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use core_privacy\local\request\approved_userlist;
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use core_privacy\local\request\contextlist;
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use core_privacy\local\request\transform;
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use core_privacy\local\request\userlist;
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/**
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* Privacy Subsystem implementation for core_group.
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*
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* @copyright 2018 Shamim Rezaie <shamim@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class provider implements
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// Groups store user data.
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\core_privacy\local\metadata\provider,
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// The group subsystem contains user's group memberships.
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\core_privacy\local\request\subsystem\provider,
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// The group subsystem can provide information to other plugins.
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\core_privacy\local\request\subsystem\plugin_provider,
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// This plugin is capable of determining which users have data within it.
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\core_privacy\local\request\core_userlist_provider,
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\core_privacy\local\request\shared_userlist_provider
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{
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/**
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* Returns meta data about this system.
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*
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* @param collection $collection The initialised collection to add items to.
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* @return collection A listing of user data stored through this system.
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*/
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public static function get_metadata(collection $collection) : collection {
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$collection->add_database_table('groups_members', [
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'groupid' => 'privacy:metadata:groups:groupid',
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'userid' => 'privacy:metadata:groups:userid',
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'timeadded' => 'privacy:metadata:groups:timeadded',
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], 'privacy:metadata:groups');
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$collection->link_subsystem('core_message', 'privacy:metadata:core_message');
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return $collection;
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}
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/**
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* Writes user data to the writer for the user to download.
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*
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* @param \context $context The context to export data for.
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* @param string $component The component that is calling this function. Empty string means no component.
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* @param array $subcontext The sub-context in which to export this data.
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* @param int $itemid Optional itemid associated with component.
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*/
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public static function export_groups(\context $context, string $component, array $subcontext = [], int $itemid = 0) {
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global $DB, $USER;
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if (!$context instanceof \context_course) {
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return;
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}
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$subcontext[] = get_string('groups', 'core_group');
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$sql = "SELECT gm.id, gm.timeadded, gm.userid, g.name, gm.groupid
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FROM {groups_members} gm
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JOIN {groups} g ON gm.groupid = g.id
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WHERE g.courseid = :courseid
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AND gm.component = :component
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AND gm.userid = :userid";
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$params = [
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'courseid' => $context->instanceid,
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'component' => $component,
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'userid' => $USER->id
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];
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if ($itemid) {
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$sql .= ' AND gm.itemid = :itemid';
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$params['itemid'] = $itemid;
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}
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$groups = $DB->get_records_sql($sql, $params);
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$groupstoexport = array_map(function($group) {
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return (object) [
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'name' => format_string($group->name),
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'timeadded' => transform::datetime($group->timeadded),
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];
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}, $groups);
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if (!empty($groups)) {
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\core_privacy\local\request\writer::with_context($context)
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->export_data($subcontext, (object) [
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'groups' => $groupstoexport,
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]);
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foreach ($groups as $group) {
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// Export associated conversations to this group.
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\core_message\privacy\provider::export_conversations($USER->id, 'core_group', 'groups',
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$context, [], $group->groupid);
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}
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}
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}
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/**
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* Deletes all group memberships for a specified context and component.
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*
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* @param \context $context Details about which context to delete group memberships for.
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* @param string $component Component to delete. Empty string means no component (manual group memberships).
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* @param int $itemid Optional itemid associated with component.
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*/
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public static function delete_groups_for_all_users(\context $context, string $component, int $itemid = 0) {
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global $DB;
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if (!$context instanceof \context_course) {
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return;
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}
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if (!$DB->record_exists('groups', ['courseid' => $context->instanceid])) {
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return;
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}
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$select = "component = :component AND groupid IN (SELECT g.id FROM {groups} g WHERE courseid = :courseid)";
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$params = ['component' => $component, 'courseid' => $context->instanceid];
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if ($itemid) {
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$select .= ' AND itemid = :itemid';
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$params['itemid'] = $itemid;
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}
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// Delete the group conversations.
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$groups = $DB->get_records_select('groups_members', $select, $params);
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foreach ($groups as $group) {
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\core_message\privacy\provider::delete_conversations_for_all_users($context, 'core_group', 'groups', $group->groupid);
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}
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// Remove members from the group.
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$DB->delete_records_select('groups_members', $select, $params);
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// Purge the group and grouping cache for users.
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\cache_helper::purge_by_definition('core', 'user_group_groupings');
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}
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/**
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* Deletes all records for a user from a list of approved contexts.
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*
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* @param approved_contextlist $contextlist Contains the user ID and a list of contexts to be deleted from.
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* @param string $component Component to delete from. Empty string means no component (manual memberships).
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* @param int $itemid Optional itemid associated with component.
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*/
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public static function delete_groups_for_user(approved_contextlist $contextlist, string $component, int $itemid = 0) {
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global $DB;
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$userid = $contextlist->get_user()->id;
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$contextids = $contextlist->get_contextids();
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if (!$contextids) {
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return;
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}
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list($contextsql, $contextparams) = $DB->get_in_or_equal($contextids, SQL_PARAMS_NAMED);
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$contextparams += ['contextcourse' => CONTEXT_COURSE];
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$groupselect = "SELECT g.id
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FROM {groups} g
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JOIN {context} ctx ON g.courseid = ctx.instanceid AND ctx.contextlevel = :contextcourse
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WHERE ctx.id $contextsql";
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if (!$DB->record_exists_sql($groupselect, $contextparams)) {
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return;
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}
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$select = "userid = :userid AND component = :component AND groupid IN ({$groupselect})";
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$params = ['userid' => $userid, 'component' => $component] + $contextparams;
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if ($itemid) {
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$select .= ' AND itemid = :itemid';
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$params['itemid'] = $itemid;
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}
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// Delete the group conversations.
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$groups = $DB->get_records_select('groups_members', $select, $params);
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foreach ($groups as $group) {
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\core_message\privacy\provider::delete_conversations_for_user($contextlist, 'core_group', 'groups', $group->groupid);
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}
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// Remove members from the group.
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$DB->delete_records_select('groups_members', $select, $params);
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// Invalidate the group and grouping cache for the user.
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\cache_helper::invalidate_by_definition('core', 'user_group_groupings', array(), array($userid));
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}
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/**
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* Add the list of users who are members of some groups in the specified constraints.
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*
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* @param userlist $userlist The userlist to add the users to.
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* @param string $component The component to check.
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* @param int $itemid Optional itemid associated with component.
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*/
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public static function get_group_members_in_context(userlist $userlist, string $component, int $itemid = 0) {
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$context = $userlist->get_context();
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if (!$context instanceof \context_course) {
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return;
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}
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// Group members in the given context.
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$sql = "SELECT gm.userid
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FROM {groups_members} gm
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JOIN {groups} g ON gm.groupid = g.id
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WHERE g.courseid = :courseid AND gm.component = :component";
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$params = [
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'courseid' => $context->instanceid,
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'component' => $component
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];
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if ($itemid) {
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$sql .= ' AND gm.itemid = :itemid';
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$params['itemid'] = $itemid;
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}
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$userlist->add_from_sql('userid', $sql, $params);
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// Get the users with some group conversation in this context.
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\core_message\privacy\provider::add_conversations_in_context($userlist, 'core_group', 'groups', $itemid);
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}
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/**
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* Deletes all records for multiple users within a single context.
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*
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* @param approved_userlist $userlist The approved context and user information to delete information for.
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* @param string $component Component to delete from. Empty string means no component (manual memberships).
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* @param int $itemid Optional itemid associated with component.
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*/
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public static function delete_groups_for_users(approved_userlist $userlist, string $component, int $itemid = 0) {
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global $DB;
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$context = $userlist->get_context();
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$userids = $userlist->get_userids();
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if (!$context instanceof \context_course) {
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return;
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}
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list($usersql, $userparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED);
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$groupselect = "SELECT id FROM {groups} WHERE courseid = :courseid";
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$groupparams = ['courseid' => $context->instanceid];
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$select = "component = :component AND userid {$usersql} AND groupid IN ({$groupselect})";
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$params = ['component' => $component] + $groupparams + $userparams;
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if ($itemid) {
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$select .= ' AND itemid = :itemid';
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$params['itemid'] = $itemid;
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}
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// Delete the group conversations for these users.
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$groups = $DB->get_records_select('groups_members', $select, $params);
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foreach ($groups as $group) {
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\core_message\privacy\provider::delete_conversations_for_users($userlist, 'core_group', 'groups', $group->groupid);
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}
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$DB->delete_records_select('groups_members', $select, $params);
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// Invalidate the group and grouping cache for the user.
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\cache_helper::invalidate_by_definition('core', 'user_group_groupings', array(), $userids);
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}
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/**
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* Get the list of contexts that contain group membership for the specified user.
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*
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* @param int $userid The user to search.
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* @param string $component The component to check.
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* @param int $itemid Optional itemid associated with component.
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* @return contextlist The contextlist containing the list of contexts.
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*/
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public static function get_contexts_for_group_member(int $userid, string $component, int $itemid = 0) {
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$contextlist = new contextlist();
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$sql = "SELECT ctx.id
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FROM {groups_members} gm
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JOIN {groups} g ON gm.groupid = g.id
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JOIN {context} ctx ON g.courseid = ctx.instanceid AND ctx.contextlevel = :contextcourse
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WHERE gm.userid = :userid AND gm.component = :component";
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$params = [
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'contextcourse' => CONTEXT_COURSE,
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'userid' => $userid,
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'component' => $component
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];
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if ($itemid) {
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$sql .= ' AND gm.itemid = :itemid';
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$params['itemid'] = $itemid;
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}
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$contextlist->add_from_sql($sql, $params);
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// Get the contexts where the userid has group conversations.
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\core_message\privacy\provider::add_contexts_for_conversations($contextlist, $userid, 'core_group', 'groups', $itemid);
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return $contextlist;
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}
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/**
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* Get the list of users who have data within a context.
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*
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* @param int $userid The user to search.
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* @return contextlist The contextlist containing the list of contexts used in this plugin.
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*/
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public static function get_contexts_for_userid(int $userid) : contextlist {
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return static::get_contexts_for_group_member($userid, '');
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}
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/**
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* Get the list of users who have data within a context.
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*
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* @param userlist $userlist The userlist containing the list of users who have data in this context/plugin combination.
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*/
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public static function get_users_in_context(userlist $userlist) {
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$context = $userlist->get_context();
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if (!$context instanceof \context_course) {
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return;
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}
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static::get_group_members_in_context($userlist, '');
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}
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/**
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* Export all user data for the specified user, in the specified contexts.
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*
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* @param approved_contextlist $contextlist The approved contexts to export information for.
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*/
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public static function export_user_data(approved_contextlist $contextlist) {
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$contexts = $contextlist->get_contexts();
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foreach ($contexts as $context) {
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static::export_groups($context, '');
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}
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}
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/**
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* Delete all data for all users in the specified context.
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*
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* @param context $context The specific context to delete data for.
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*/
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public static function delete_data_for_all_users_in_context(\context $context) {
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static::delete_groups_for_all_users($context, '');
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}
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/**
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* Delete all user data for the specified user, in the specified contexts.
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*
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* @param approved_contextlist $contextlist The approved contexts and user information to delete information for.
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*/
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public static function delete_data_for_user(approved_contextlist $contextlist) {
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static::delete_groups_for_user($contextlist, '');
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}
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/**
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* Delete multiple users within a single context.
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*
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* @param approved_userlist $userlist The approved context and user information to delete information for.
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*/
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public static function delete_data_for_users(approved_userlist $userlist) {
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static::delete_groups_for_users($userlist, '');
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}
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}
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