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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/>.
/**
* Privacy Subsystem implementation for mod_choice.
*
* @package mod_choice
* @category privacy
* @copyright 2018 Jun Pataleta
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace mod_choice\privacy;
use core_privacy\local\metadata\collection;
use core_privacy\local\request\approved_contextlist;
use core_privacy\local\request\approved_userlist;
use core_privacy\local\request\contextlist;
use core_privacy\local\request\deletion_criteria;
use core_privacy\local\request\helper;
use core_privacy\local\request\userlist;
use core_privacy\local\request\writer;
defined('MOODLE_INTERNAL') || die();
/**
* Implementation of the privacy subsystem plugin provider for the choice activity module.
*
* @copyright 2018 Jun Pataleta
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class provider implements
// This plugin stores personal data.
\core_privacy\local\metadata\provider,
// This plugin is a core_user_data_provider.
\core_privacy\local\request\plugin\provider,
// This plugin is capable of determining which users have data within it.
\core_privacy\local\request\core_userlist_provider {
/**
* Return the fields which contain personal data.
*
* @param collection $items a reference to the collection to use to store the metadata.
* @return collection the updated collection of metadata items.
*/
public static function get_metadata(collection $items) : collection {
$items->add_database_table(
'choice_answers',
[
'choiceid' => 'privacy:metadata:choice_answers:choiceid',
'optionid' => 'privacy:metadata:choice_answers:optionid',
'userid' => 'privacy:metadata:choice_answers:userid',
'timemodified' => 'privacy:metadata:choice_answers:timemodified',
],
'privacy:metadata:choice_answers'
);
return $items;
}
/**
* Get the list of contexts that contain user information for the specified user.
*
* @param int $userid the userid.
* @return contextlist the list of contexts containing user info for the user.
*/
public static function get_contexts_for_userid(int $userid) : contextlist {
// Fetch all choice answers.
$sql = "SELECT c.id
FROM {context} c
INNER JOIN {course_modules} cm ON cm.id = c.instanceid AND c.contextlevel = :contextlevel
INNER JOIN {modules} m ON m.id = cm.module AND m.name = :modname
INNER JOIN {choice} ch ON ch.id = cm.instance
INNER JOIN {choice_options} co ON co.choiceid = ch.id
INNER JOIN {choice_answers} ca ON ca.optionid = co.id AND ca.choiceid = ch.id
WHERE ca.userid = :userid";
$params = [
'modname' => 'choice',
'contextlevel' => CONTEXT_MODULE,
'userid' => $userid,
];
$contextlist = new contextlist();
$contextlist->add_from_sql($sql, $params);
return $contextlist;
}
/**
* Get the list of users who have data within a context.
*
* @param userlist $userlist The userlist containing the list of users who have data in this context/plugin combination.
*/
public static function get_users_in_context(userlist $userlist) {
$context = $userlist->get_context();
if (!$context instanceof \context_module) {
return;
}
// Fetch all choice answers.
$sql = "SELECT ca.userid
FROM {course_modules} cm
JOIN {modules} m ON m.id = cm.module AND m.name = :modname
JOIN {choice} ch ON ch.id = cm.instance
JOIN {choice_options} co ON co.choiceid = ch.id
JOIN {choice_answers} ca ON ca.optionid = co.id AND ca.choiceid = ch.id
WHERE cm.id = :cmid";
$params = [
'cmid' => $context->instanceid,
'modname' => 'choice',
];
$userlist->add_from_sql('userid', $sql, $params);
}
/**
* Export personal data for the given approved_contextlist. User and context information is contained within the contextlist.
*
* @param approved_contextlist $contextlist a list of contexts approved for export.
*/
public static function export_user_data(approved_contextlist $contextlist) {
global $DB;
if (empty($contextlist->count())) {
return;
}
$user = $contextlist->get_user();
list($contextsql, $contextparams) = $DB->get_in_or_equal($contextlist->get_contextids(), SQL_PARAMS_NAMED);
$sql = "SELECT cm.id AS cmid,
co.text as answer,
ca.timemodified
FROM {context} c
INNER JOIN {course_modules} cm ON cm.id = c.instanceid AND c.contextlevel = :contextlevel
INNER JOIN {modules} m ON m.id = cm.module AND m.name = :modname
INNER JOIN {choice} ch ON ch.id = cm.instance
INNER JOIN {choice_options} co ON co.choiceid = ch.id
INNER JOIN {choice_answers} ca ON ca.optionid = co.id AND ca.choiceid = ch.id
WHERE c.id {$contextsql}
AND ca.userid = :userid
ORDER BY cm.id";
$params = ['modname' => 'choice', 'contextlevel' => CONTEXT_MODULE, 'userid' => $user->id] + $contextparams;
// Reference to the choice activity seen in the last iteration of the loop. By comparing this with the current record, and
// because we know the results are ordered, we know when we've moved to the answers for a new choice activity and therefore
// when we can export the complete data for the last activity.
$lastcmid = null;
$choiceanswers = $DB->get_recordset_sql($sql, $params);
foreach ($choiceanswers as $choiceanswer) {
// If we've moved to a new choice, then write the last choice data and reinit the choice data array.
if ($lastcmid != $choiceanswer->cmid) {
if (!empty($choicedata)) {
$context = \context_module::instance($lastcmid);
self::export_choice_data_for_user($choicedata, $context, $user);
}
$choicedata = [
'answer' => [],
'timemodified' => \core_privacy\local\request\transform::datetime($choiceanswer->timemodified),
];
}
$choicedata['answer'][] = $choiceanswer->answer;
$lastcmid = $choiceanswer->cmid;
}
$choiceanswers->close();
// The data for the last activity won't have been written yet, so make sure to write it now!
if (!empty($choicedata)) {
$context = \context_module::instance($lastcmid);
self::export_choice_data_for_user($choicedata, $context, $user);
}
}
/**
* Export the supplied personal data for a single choice activity, along with any generic data or area files.
*
* @param array $choicedata the personal data to export for the choice.
* @param \context_module $context the context of the choice.
* @param \stdClass $user the user record
*/
protected static function export_choice_data_for_user(array $choicedata, \context_module $context, \stdClass $user) {
// Fetch the generic module data for the choice.
$contextdata = helper::get_context_data($context, $user);
// Merge with choice data and write it.
$contextdata = (object)array_merge((array)$contextdata, $choicedata);
writer::with_context($context)->export_data([], $contextdata);
// Write generic module intro files.
helper::export_context_files($context, $user);
}
/**
* Delete all data for all users in the specified context.
*
* @param \context $context the context to delete in.
*/
public static function delete_data_for_all_users_in_context(\context $context) {
global $DB;
if (!$context instanceof \context_module) {
return;
}
if ($cm = get_coursemodule_from_id('choice', $context->instanceid)) {
$DB->delete_records('choice_answers', ['choiceid' => $cm->instance]);
}
}
/**
* Delete all user data for the specified user, in the specified contexts.
*
* @param approved_contextlist $contextlist a list of contexts approved for deletion.
*/
public static function delete_data_for_user(approved_contextlist $contextlist) {
global $DB;
if (empty($contextlist->count())) {
return;
}
$userid = $contextlist->get_user()->id;
foreach ($contextlist->get_contexts() as $context) {
if (!$context instanceof \context_module) {
continue;
}
$instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid]);
if (!$instanceid) {
continue;
}
$DB->delete_records('choice_answers', ['choiceid' => $instanceid, 'userid' => $userid]);
}
}
/**
* Delete multiple users within a single context.
*
* @param approved_userlist $userlist The approved context and user information to delete information for.
*/
public static function delete_data_for_users(approved_userlist $userlist) {
global $DB;
$context = $userlist->get_context();
if (!$context instanceof \context_module) {
return;
}
$cm = get_coursemodule_from_id('choice', $context->instanceid);
if (!$cm) {
// Only choice module will be handled.
return;
}
$userids = $userlist->get_userids();
list($usersql, $userparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED);
$select = "choiceid = :choiceid AND userid $usersql";
$params = ['choiceid' => $cm->instance] + $userparams;
$DB->delete_records_select('choice_answers', $select, $params);
}
}