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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/>.
/**
* Data provider.
*
* @package core_webservice
* @copyright 2018 Frédéric Massart
* @author Frédéric Massart <fred@branchup.tech>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_webservice\privacy;
defined('MOODLE_INTERNAL') || die();
use context;
use context_user;
use core_privacy\local\metadata\collection;
use core_privacy\local\request\approved_contextlist;
use core_privacy\local\request\transform;
use core_privacy\local\request\writer;
use core_privacy\local\request\userlist;
use core_privacy\local\request\approved_userlist;
/**
* Data provider class.
*
* @package core_webservice
* @copyright 2018 Frédéric Massart
* @author Frédéric Massart <fred@branchup.tech>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class provider implements
\core_privacy\local\metadata\provider,
\core_privacy\local\request\core_userlist_provider,
\core_privacy\local\request\subsystem\provider {
/**
* Returns metadata.
*
* @param collection $collection The initialised collection to add items to.
* @return collection A listing of user data stored through this system.
*/
public static function get_metadata(collection $collection) : collection {
$collection->add_database_table('external_tokens', [
'token' => 'privacy:metadata:tokens:token',
'privatetoken' => 'privacy:metadata:tokens:privatetoken',
'tokentype' => 'privacy:metadata:tokens:tokentype',
'userid' => 'privacy:metadata:tokens:userid',
'creatorid' => 'privacy:metadata:tokens:creatorid',
'iprestriction' => 'privacy:metadata:tokens:iprestriction',
'validuntil' => 'privacy:metadata:tokens:validuntil',
'timecreated' => 'privacy:metadata:tokens:timecreated',
'lastaccess' => 'privacy:metadata:tokens:lastaccess',
], 'privacy:metadata:tokens');
$collection->add_database_table('external_services_users', [
'userid' => 'privacy:metadata:serviceusers:userid',
'iprestriction' => 'privacy:metadata:serviceusers:iprestriction',
'validuntil' => 'privacy:metadata:serviceusers:validuntil',
'timecreated' => 'privacy:metadata:serviceusers:timecreated',
], 'privacy:metadata:serviceusers');
return $collection;
}
/**
* Get the list of contexts that contain user information for the specified user.
*
* @param int $userid The user to search.
* @return contextlist $contextlist The contextlist containing the list of contexts used in this plugin.
*/
public static function get_contexts_for_userid(int $userid) : \core_privacy\local\request\contextlist {
$contextlist = new \core_privacy\local\request\contextlist();
$sql = "
SELECT ctx.id
FROM {external_tokens} t
JOIN {context} ctx
ON ctx.instanceid = t.userid
AND ctx.contextlevel = :userlevel
WHERE t.userid = :userid1
OR t.creatorid = :userid2";
$contextlist->add_from_sql($sql, ['userlevel' => CONTEXT_USER, 'userid1' => $userid, 'userid2' => $userid]);
$sql = "
SELECT ctx.id
FROM {external_services_users} su
JOIN {context} ctx
ON ctx.instanceid = su.userid
AND ctx.contextlevel = :userlevel
WHERE su.userid = :userid";
$contextlist->add_from_sql($sql, ['userlevel' => CONTEXT_USER, 'userid' => $userid]);
return $contextlist;
}
/**
* Get the list of users within a specific 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) {
global $DB;
$context = $userlist->get_context();
if (!$context instanceof \context_user) {
return;
}
$userid = $context->instanceid;
$hasdata = false;
$hasdata = $hasdata || $DB->record_exists_select('external_tokens', 'userid = ? OR creatorid = ?', [$userid, $userid]);
$hasdata = $hasdata || $DB->record_exists('external_services_users', ['userid' => $userid]);
if ($hasdata) {
$userlist->add_user($userid);
}
}
/**
* Export all user data for the specified user, in the specified contexts.
*
* @param approved_contextlist $contextlist The approved contexts to export information for.
*/
public static function export_user_data(approved_contextlist $contextlist) {
global $DB;
$userid = $contextlist->get_user()->id;
$contexts = array_reduce($contextlist->get_contexts(), function($carry, $context) use ($userid) {
if ($context->contextlevel == CONTEXT_USER) {
if ($context->instanceid == $userid) {
$carry['has_mine'] = true;
} else {
$carry['others'][] = $context->instanceid;
}
}
return $carry;
}, [
'has_mine' => false,
'others' => []
]);
$path = [get_string('webservices', 'core_webservice')];
// Exporting my stuff.
if ($contexts['has_mine']) {
$data = [];
// Exporting my tokens.
$sql = "
SELECT t.*, s.name as externalservicename
FROM {external_tokens} t
JOIN {external_services} s
ON s.id = t.externalserviceid
WHERE t.userid = :userid
ORDER BY t.id";
$recordset = $DB->get_recordset_sql($sql, ['userid' => $userid]);
foreach ($recordset as $record) {
if (!isset($data['tokens'])) {
$data['tokens'] = [];
}
$data['tokens'][] = static::transform_token($record);
}
$recordset->close();
// Exporting the services I have access to.
$sql = "
SELECT su.*, s.name as externalservicename
FROM {external_services_users} su
JOIN {external_services} s
ON s.id = su.externalserviceid
WHERE su.userid = :userid
ORDER BY su.id";
$recordset = $DB->get_recordset_sql($sql, ['userid' => $userid]);
foreach ($recordset as $record) {
if (!isset($data['services_user'])) {
$data['services_user'] = [];
}
$data['services_user'][] = [
'external_service' => $record->externalservicename,
'ip_restriction' => $record->iprestriction,
'valid_until' => $record->validuntil ? transform::datetime($record->validuntil) : null,
'created_on' => transform::datetime($record->timecreated),
];
}
$recordset->close();
if (!empty($data)) {
writer::with_context(context_user::instance($userid))->export_data($path, (object) $data);
};
}
// Exporting the tokens I created.
if (!empty($contexts['others'])) {
list($insql, $inparams) = $DB->get_in_or_equal($contexts['others'], SQL_PARAMS_NAMED);
$sql = "
SELECT t.*, s.name as externalservicename
FROM {external_tokens} t
JOIN {external_services} s
ON s.id = t.externalserviceid
WHERE t.userid $insql
AND t.creatorid = :userid1
AND t.userid <> :userid2
ORDER BY t.userid, t.id";
$params = array_merge($inparams, ['userid1' => $userid, 'userid2' => $userid]);
$recordset = $DB->get_recordset_sql($sql, $params);
static::recordset_loop_and_export($recordset, 'userid', [], function($carry, $record) {
$carry[] = static::transform_token($record);
return $carry;
}, function($userid, $data) use ($path) {
writer::with_context(context_user::instance($userid))->export_related_data($path, 'created_by_you', (object) [
'tokens' => $data
]);
});
}
}
/**
* Delete all data for all users in the specified context.
*
* @param context $context The specific context to delete data for.
*/
public static function delete_data_for_all_users_in_context(context $context) {
if ($context->contextlevel != CONTEXT_USER) {
return;
}
static::delete_user_data($context->instanceid);
}
/**
* 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) {
$context = $userlist->get_context();
if ($context instanceof \context_user) {
static::delete_user_data($context->instanceid);
}
}
/**
* Delete all user data for the specified user, in the specified contexts.
*
* @param approved_contextlist $contextlist The approved contexts and user information to delete information for.
*/
public static function delete_data_for_user(approved_contextlist $contextlist) {
$userid = $contextlist->get_user()->id;
foreach ($contextlist as $context) {
if ($context->contextlevel == CONTEXT_USER && $context->instanceid == $userid) {
static::delete_user_data($context->instanceid);
break;
}
}
}
/**
* Delete user data.
*
* @param int $userid The user ID.
* @return void
*/
protected static function delete_user_data($userid) {
global $DB;
$DB->delete_records('external_tokens', ['userid' => $userid]);
$DB->delete_records('external_services_users', ['userid' => $userid]);
}
/**
* Transform a token entry.
*
* @param object $record The token record.
* @return array
*/
protected static function transform_token($record) {
$notexportedstr = get_string('privacy:request:notexportedsecurity', 'core_webservice');
return [
'external_service' => $record->externalservicename,
'token' => $notexportedstr,
'private_token' => $record->privatetoken ? $notexportedstr : null,
'ip_restriction' => $record->iprestriction,
'valid_until' => $record->validuntil ? transform::datetime($record->validuntil) : null,
'created_on' => transform::datetime($record->timecreated),
'last_access' => $record->lastaccess ? transform::datetime($record->lastaccess) : null,
];
}
/**
* Loop and export from a recordset.
*
* @param \moodle_recordset $recordset The recordset.
* @param string $splitkey The record key to determine when to export.
* @param mixed $initial The initial data to reduce from.
* @param callable $reducer The function to return the dataset, receives current dataset, and the current record.
* @param callable $export The function to export the dataset, receives the last value from $splitkey and the dataset.
* @return void
*/
protected static function recordset_loop_and_export(\moodle_recordset $recordset, $splitkey, $initial,
callable $reducer, callable $export) {
$data = $initial;
$lastid = null;
foreach ($recordset as $record) {
if ($lastid && $record->{$splitkey} != $lastid) {
$export($lastid, $data);
$data = $initial;
}
$data = $reducer($data, $record);
$lastid = $record->{$splitkey};
}
$recordset->close();
if (!empty($lastid)) {
$export($lastid, $data);
}
}
}