Proyectos de Subversion Moodle

<?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 class for requesting user data.

 *

 * @package    tool_monitor

 * @copyright  2018 Adrian Greeve <adrian@moodle.com>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

namespace tool_monitor\privacy;

defined('MOODLE_INTERNAL') || die();

use \core_privacy\local\metadata\collection;

use \core_privacy\local\request\contextlist;

use \core_privacy\local\request\approved_contextlist;

use \core_privacy\local\request\approved_userlist;

use \core_privacy\local\request\transform;

use \core_privacy\local\request\userlist;

use \core_privacy\local\request\writer;

use \tool_monitor\subscription_manager;

use \tool_monitor\rule_manager;

/**

 * Privacy provider for tool_monitor

 *

 * @package    tool_monitor

 * @copyright  2018 Adrian Greeve <adrian@moodle.com>

 * @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\plugin\provider {

    /**

     * Get information about the user data stored by this plugin.

     *

     * @param  collection $collection An object for storing metadata.

     * @return collection The metadata.

     */

    public static function get_metadata(collection $collection): collection {

        $toolmonitorrules = [

            'description' => 'privacy:metadata:description',

            'name' => 'privacy:metadata:name',

            'userid' => 'privacy:metadata:userid',

            'plugin' => 'privacy:metadata:plugin',

            'eventname' => 'privacy:metadata:eventname',

            'template' => 'privacy:metadata:template',

            'frequency' => 'privacy:metadata:frequency',

            'timewindow' => 'privacy:metadata:timewindow',

            'timemodified' => 'privacy:metadata:timemodifiedrule',

            'timecreated' => 'privacy:metadata:timecreatedrule'

        ];

        $toolmonitorsubscriptions = [

            'userid' => 'privacy:metadata:useridsub',

            'timecreated' => 'privacy:metadata:timecreatedsub',

            'lastnotificationsent' => 'privacy:metadata:lastnotificationsent',

            'inactivedate' => 'privacy:metadata:inactivedate'

        ];

        // Tool monitor history doesn't look like it is used at all.

        $toolmonitorhistory = [

            'userid' => 'privacy:metadata:useridhistory',

            'timesent' => 'privacy:metadata:timesent'

        ];

        $collection->add_database_table('tool_monitor_rules', $toolmonitorrules, 'privacy:metadata:rulessummary');

        $collection->add_database_table('tool_monitor_subscriptions', $toolmonitorsubscriptions,

                'privacy:metadata:subscriptionssummary');

        $collection->add_database_table('tool_monitor_history', $toolmonitorhistory, 'privacy:metadata:historysummary');

        $collection->link_subsystem('core_message', 'privacy:metadata:messagesummary');

        return $collection;

    }

    /**

     * Return all contexts for this userid. In this situation the user context.

     *

     * @param  int $userid The user ID.

     * @return contextlist The list of context IDs.

     */

    public static function get_contexts_for_userid(int $userid): contextlist {

        $params = ['useridrules' => $userid, 'useridsubscriptions' => $userid, 'contextuserrule' => CONTEXT_USER,

                'contextusersub' => CONTEXT_USER];

        $sql = "SELECT DISTINCT ctx.id

                  FROM {context} ctx

             LEFT JOIN {tool_monitor_rules} mr ON ctx.instanceid = mr.userid AND ctx.contextlevel = :contextuserrule

                       AND mr.userid = :useridsubscriptions

             LEFT JOIN {tool_monitor_subscriptions} ms ON ctx.instanceid = ms.userid AND ctx.contextlevel = :contextusersub

                       AND ms.userid = :useridrules

                 WHERE ms.id IS NOT NULL OR mr.id IS NOT NULL";

        $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_user) {

            return;

        }

        $params = ['userid' => $context->instanceid];

        $sql = "SELECT userid FROM {tool_monitor_rules} WHERE userid = :userid";

        $userlist->add_from_sql('userid', $sql, $params);

        $sql = "SELECT userid FROM {tool_monitor_subscriptions} WHERE userid = :userid";

        $userlist->add_from_sql('userid', $sql, $params);

    }

    /**

     * Export all event monitor information for the list of contexts and this user.

     *

     * @param  approved_contextlist $contextlist The list of approved contexts for a user.

     */

    public static function export_user_data(approved_contextlist $contextlist) {

        global $DB;

        // Export rules.

        $context = \context_user::instance($contextlist->get_user()->id);

        $rules = $DB->get_records('tool_monitor_rules', ['userid' => $contextlist->get_user()->id]);

        if ($rules) {

            static::export_monitor_rules($rules, $context);

        }

        // Export subscriptions.

        $subscriptions = subscription_manager::get_user_subscriptions(0, 0, $contextlist->get_user()->id);

        if ($subscriptions) {

            static::export_monitor_subscriptions($subscriptions, $context);

        }

    }

    /**

     * Delete all user data for this context.

     *

     * @param  \context $context The context to delete data for.

     */

    public static function delete_data_for_all_users_in_context(\context $context) {

        // Only delete data for user contexts.

        if ($context->contextlevel == CONTEXT_USER) {

            static::delete_user_data($context->instanceid);

        }

    }

    /**

     * Delete all user data for this user only.

     *

     * @param  approved_contextlist $contextlist The list of approved contexts for a user.

     */

    public static function delete_data_for_user(approved_contextlist $contextlist) {

        static::delete_user_data($contextlist->get_user()->id);

    }

    /**

     * 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();

        $userids = $userlist->get_userids();

        $userid = reset($userids);

        // Only delete data for user context, which should be a single user.

        if ($context->contextlevel == CONTEXT_USER && count($userids) == 1 && $userid == $context->instanceid) {

            static::delete_user_data($userid);

        }

    }

    /**

     * This does the deletion of user data for the event monitor.

     *

     * @param  int $userid The user ID

     */

    protected static function delete_user_data(int $userid) {

        global $DB;

        // Delete this user's subscriptions first.

        subscription_manager::delete_user_subscriptions($userid);

        // Because we only use user contexts the instance ID is the user ID.

        // Get the rules and check if this user has the capability to delete them.

        $rules = $DB->get_records('tool_monitor_rules', ['userid' => $userid]);

        foreach ($rules as $ruledata) {

            $rule = rule_manager::get_rule($ruledata);

            // If no-one is suscribed to the rule then it is safe to delete.

            if ($rule->can_manage_rule($userid) && subscription_manager::count_rule_subscriptions($rule->id) == 0) {

                $rule->delete_rule();

            }

        }

    }

    /**

     * This formats and then exports the monitor rules.

     *

     * @param  array $rules The monitor rules.

     * @param  context_user $context The user context

     */

    protected static function export_monitor_rules(array $rules, \context_user $context) {

        foreach ($rules as $rule) {

            $rule = rule_manager::get_rule($rule);

            $ruledata = new \stdClass();

            $ruledata->name = $rule->name;

            $ruledata->eventname = $rule->get_event_name();

            $ruledata->description = $rule->get_description($context);

            $ruledata->plugin = $rule->get_plugin_name();

            $ruledata->template = $rule->template;

            $ruledata->frequency = $rule->get_filters_description();

            $ruledata->course = $rule->get_course_name($context);

            $ruledata->timecreated = transform::datetime($rule->timecreated);

            $ruledata->timemodified = transform::datetime($rule->timemodified);

            writer::with_context($context)->export_data([get_string('privacy:createdrules', 'tool_monitor'),

                    $rule->name . '_' . $rule->id], $ruledata);

        }

    }

    /**

     * This formats and then exports the event monitor subscriptions.

     *

     * @param  array $subscriptions Subscriptions

     * @param  \context_user $context The user context

     */

    protected static function export_monitor_subscriptions(array $subscriptions, \context_user $context) {

        foreach ($subscriptions as $subscription) {

            $subscriptiondata = new \stdClass();

            $subscriptiondata->instancename = $subscription->get_instance_name();

            $subscriptiondata->eventname = $subscription->get_event_name();

            $subscriptiondata->frequency = $subscription->get_filters_description();

            $subscriptiondata->name = $subscription->get_name($context);

            $subscriptiondata->description = $subscription->get_description($context);

            $subscriptiondata->pluginname = $subscription->get_plugin_name();

            $subscriptiondata->course = $subscription->get_course_name($context);

            $subscriptiondata->timecreated = transform::datetime($subscription->timecreated);

            $subscriptiondata->lastnotificationsent = transform::datetime($subscription->lastnotificationsent);

            writer::with_context($context)->export_data([get_string('privacy:subscriptions', 'tool_monitor'),

                    $subscriptiondata->name . '_' . $subscription->id, $subscriptiondata->course, $subscriptiondata->instancename],

                    $subscriptiondata);

        }

    }

}