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334 lines
12 KiB
334 lines
12 KiB
2 years ago
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<?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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* Data provider.
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*
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* @package mod_chat
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* @copyright 2018 Frédéric Massart
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* @author Frédéric Massart <fred@branchup.tech>
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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 mod_chat\privacy;
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defined('MOODLE_INTERNAL') || die();
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use context;
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use context_helper;
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use context_module;
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use moodle_recordset;
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use stdClass;
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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\helper;
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use core_privacy\local\request\transform;
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use core_privacy\local\request\userlist;
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use core_privacy\local\request\writer;
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/**
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* Data provider class.
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*
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* @package mod_chat
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* @copyright 2018 Frédéric Massart
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* @author Frédéric Massart <fred@branchup.tech>
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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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\core_privacy\local\metadata\provider,
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\core_privacy\local\request\core_userlist_provider,
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\core_privacy\local\request\plugin\provider {
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/**
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* Returns metadata.
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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('chat_messages', [
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'userid' => 'privacy:metadata:messages:userid',
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'message' => 'privacy:metadata:messages:message',
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'issystem' => 'privacy:metadata:messages:issystem',
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'timestamp' => 'privacy:metadata:messages:timestamp',
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], 'privacy:metadata:messages');
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// The tables chat_messages_current and chat_users are not exported/deleted
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// because they are considered as short-lived data and are deleted on a
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// regular basis by cron, or during normal requests. TODO MDL-62006.
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$collection->add_database_table('chat_messages_current', [
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'userid' => 'privacy:metadata:messages:userid',
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'message' => 'privacy:metadata:messages:message',
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'issystem' => 'privacy:metadata:messages:issystem',
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'timestamp' => 'privacy:metadata:messages:timestamp'
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], 'privacy:metadata:chat_messages_current');
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$collection->add_database_table('chat_users', [
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'userid' => 'privacy:metadata:chat_users:userid',
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'version' => 'privacy:metadata:chat_users:version',
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'ip' => 'privacy:metadata:chat_users:ip',
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'firstping' => 'privacy:metadata:chat_users:firstping',
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'lastping' => 'privacy:metadata:chat_users:lastping',
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'lastmessageping' => 'privacy:metadata:chat_users:lastmessageping',
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'lang' => 'privacy:metadata:chat_users:lang'
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], 'privacy:metadata:chat_users');
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return $collection;
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}
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/**
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* Get the list of contexts that contain user information for the specified user.
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*
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* @param int $userid The user to search.
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* @return contextlist $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 $userid) : \core_privacy\local\request\contextlist {
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$contextlist = new \core_privacy\local\request\contextlist();
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$sql = "
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SELECT DISTINCT ctx.id
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FROM {chat} c
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JOIN {modules} m
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ON m.name = :chat
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JOIN {course_modules} cm
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ON cm.instance = c.id
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AND cm.module = m.id
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JOIN {context} ctx
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ON ctx.instanceid = cm.id
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AND ctx.contextlevel = :modulelevel
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JOIN {chat_messages} chm
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ON chm.chatid = c.id
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WHERE chm.userid = :userid";
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$params = [
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'chat' => 'chat',
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'modulelevel' => CONTEXT_MODULE,
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'userid' => $userid,
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];
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$contextlist->add_from_sql($sql, $params);
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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 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 = $userlist->get_context();
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if (!is_a($context, \context_module::class)) {
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return;
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}
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$params = [
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'instanceid' => $context->instanceid,
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'modulename' => 'chat',
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];
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$sql = "SELECT chm.userid
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FROM {course_modules} cm
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JOIN {modules} m ON m.id = cm.module AND m.name = :modulename
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JOIN {chat} c ON c.id = cm.instance
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JOIN {chat_messages} chm ON chm.chatid = c.id
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WHERE cm.id = :instanceid";
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$userlist->add_from_sql('userid', $sql, $params);
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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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global $DB;
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$user = $contextlist->get_user();
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$userid = $user->id;
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$cmids = array_reduce($contextlist->get_contexts(), function($carry, $context) {
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if ($context->contextlevel == CONTEXT_MODULE) {
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$carry[] = $context->instanceid;
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}
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return $carry;
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}, []);
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if (empty($cmids)) {
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return;
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}
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$chatidstocmids = static::get_chat_ids_to_cmids_from_cmids($cmids);
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$chatids = array_keys($chatidstocmids);
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// Export the messages.
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list($insql, $inparams) = $DB->get_in_or_equal($chatids, SQL_PARAMS_NAMED);
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$params = array_merge($inparams, ['userid' => $userid]);
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$recordset = $DB->get_recordset_select('chat_messages', "chatid $insql AND userid = :userid", $params, 'timestamp, id');
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static::recordset_loop_and_export($recordset, 'chatid', [], function($carry, $record) use ($user, $chatidstocmids) {
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$message = $record->message;
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if ($record->issystem) {
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$message = get_string('message' . $record->message, 'mod_chat', fullname($user));
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}
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$carry[] = [
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'message' => $message,
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'sent_at' => transform::datetime($record->timestamp),
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'is_system_generated' => transform::yesno($record->issystem),
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];
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return $carry;
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}, function($chatid, $data) use ($user, $chatidstocmids) {
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$context = context_module::instance($chatidstocmids[$chatid]);
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$contextdata = helper::get_context_data($context, $user);
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$finaldata = (object) array_merge((array) $contextdata, ['messages' => $data]);
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helper::export_context_files($context, $user);
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writer::with_context($context)->export_data([], $finaldata);
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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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global $DB;
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if ($context->contextlevel != CONTEXT_MODULE) {
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return;
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}
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$cm = get_coursemodule_from_id('chat', $context->instanceid);
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if (!$cm) {
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return;
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}
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$chatid = $cm->instance;
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$DB->delete_records_select('chat_messages', 'chatid = :chatid', ['chatid' => $chatid]);
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$DB->delete_records_select('chat_messages_current', 'chatid = :chatid', ['chatid' => $chatid]);
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$DB->delete_records_select('chat_users', 'chatid = :chatid', ['chatid' => $chatid]);
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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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global $DB;
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$userid = $contextlist->get_user()->id;
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$cmids = array_reduce($contextlist->get_contexts(), function($carry, $context) {
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if ($context->contextlevel == CONTEXT_MODULE) {
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$carry[] = $context->instanceid;
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}
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return $carry;
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}, []);
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if (empty($cmids)) {
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return;
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}
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$chatidstocmids = static::get_chat_ids_to_cmids_from_cmids($cmids);
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$chatids = array_keys($chatidstocmids);
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list($insql, $inparams) = $DB->get_in_or_equal($chatids, SQL_PARAMS_NAMED);
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$sql = "chatid $insql AND userid = :userid";
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$params = array_merge($inparams, ['userid' => $userid]);
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$DB->delete_records_select('chat_messages', $sql, $params);
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$DB->delete_records_select('chat_messages_current', $sql, $params);
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$DB->delete_records_select('chat_users', $sql, $params);
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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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global $DB;
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$context = $userlist->get_context();
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$cm = $DB->get_record('course_modules', ['id' => $context->instanceid]);
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$chat = $DB->get_record('chat', ['id' => $cm->instance]);
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list($userinsql, $userinparams) = $DB->get_in_or_equal($userlist->get_userids(), SQL_PARAMS_NAMED);
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$params = array_merge(['chatid' => $chat->id], $userinparams);
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$sql = "chatid = :chatid AND userid {$userinsql}";
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$DB->delete_records_select('chat_messages', $sql, $params);
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$DB->delete_records_select('chat_messages_current', $sql, $params);
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$DB->delete_records_select('chat_users', $sql, $params);
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}
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/**
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* Return a dict of chat IDs mapped to their course module ID.
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*
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* @param array $cmids The course module IDs.
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* @return array In the form of [$chatid => $cmid].
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*/
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protected static function get_chat_ids_to_cmids_from_cmids(array $cmids) {
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global $DB;
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list($insql, $inparams) = $DB->get_in_or_equal($cmids, SQL_PARAMS_NAMED);
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$sql = "
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SELECT c.id, cm.id AS cmid
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FROM {chat} c
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JOIN {modules} m
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ON m.name = :chat
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JOIN {course_modules} cm
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ON cm.instance = c.id
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AND cm.module = m.id
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WHERE cm.id $insql";
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$params = array_merge($inparams, ['chat' => 'chat']);
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return $DB->get_records_sql_menu($sql, $params);
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}
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/**
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* Loop and export from a recordset.
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*
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* @param moodle_recordset $recordset The recordset.
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* @param string $splitkey The record key to determine when to export.
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* @param mixed $initial The initial data to reduce from.
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* @param callable $reducer The function to return the dataset, receives current dataset, and the current record.
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* @param callable $export The function to export the dataset, receives the last value from $splitkey and the dataset.
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* @return void
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*/
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protected static function recordset_loop_and_export(moodle_recordset $recordset, $splitkey, $initial,
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callable $reducer, callable $export) {
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$data = $initial;
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$lastid = null;
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foreach ($recordset as $record) {
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if ($lastid && $record->{$splitkey} != $lastid) {
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$export($lastid, $data);
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$data = $initial;
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}
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$data = $reducer($data, $record);
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$lastid = $record->{$splitkey};
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}
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$recordset->close();
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if (!empty($lastid)) {
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$export($lastid, $data);
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}
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}
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}
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