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/>.

/**

 * @package    moodlecore

 * @subpackage backup-factories

 * @copyright  2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}

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

 */

/**

 * Non instantiable helper class providing different restore checks

 *

 * This class contains various static methods available in order to easily

 * perform a bunch of restore architecture tests

 *

 * TODO: Finish phpdocs

 */

abstract class restore_check {

    public static function check_courseid($courseid) {

        global $DB;

        // id must exist in course table

        if (! $DB->record_exists('course', array('id' => $courseid))) {

            throw new restore_controller_exception('restore_check_course_not_exists', $courseid);

        }

        return true;

    }

    public static function check_user($userid) {

        global $DB;

        // userid must exist in user table

        if (! $DB->record_exists('user', array('id' => $userid))) {

            throw new restore_controller_exception('restore_check_user_not_exists', $userid);

        }

        return true;

    }

    public static function check_security($restore_controller, $apply) {

        global $DB;

        if (! $restore_controller instanceof restore_controller) {

            throw new restore_controller_exception('restore_check_security_requires_restore_controller');

        }

        $restore_controller->log('checking plan security', backup::LOG_INFO);

        // Some handy vars

        $type     = $restore_controller->get_type();

        $mode     = $restore_controller->get_mode();

        $courseid = $restore_controller->get_courseid();

        $coursectx= context_course::instance($courseid);

        $userid   = $restore_controller->get_userid();

        // Note: all the checks along the function MUST be performed for $userid, that

        // is the user who "requested" the course restore, not current $USER at all!!

        // First of all, decide which caps/contexts are we going to check

        // for common backups (general, automated...) based exclusively

        // in the type (course, section, activity). And store them into

        // one capability => context array structure

        $typecapstocheck = array();

        switch ($type) {

            case backup::TYPE_1COURSE :

                $typecapstocheck['moodle/restore:restorecourse'] = $coursectx;

                break;

            case backup::TYPE_1SECTION :

                $typecapstocheck['moodle/restore:restoresection'] = $coursectx;

                break;

            case backup::TYPE_1ACTIVITY :

                $typecapstocheck['moodle/restore:restoreactivity'] = $coursectx;

                break;

            default :

                throw new restore_controller_exception('restore_unknown_restore_type', $type);

        }

        // Now, if restore mode is hub or import, check userid has permissions for those modes

        // other modes will perform common checks only (restorexxxx capabilities in $typecapstocheck)

        switch ($mode) {

            case backup::MODE_IMPORT:

                if (!has_capability('moodle/restore:restoretargetimport', $coursectx, $userid)) {

                    $a = new stdclass();

                    $a->userid = $userid;

                    $a->courseid = $courseid;

                    $a->capability = 'moodle/restore:restoretargetimport';

                    throw new restore_controller_exception('restore_user_missing_capability', $a);

                }

                break;

            // Common backup (general, automated...), let's check all the $typecapstocheck

            // capability => context pairs

            default:

                foreach ($typecapstocheck as $capability => $context) {

                    if (!has_capability($capability, $context, $userid)) {

                        $a = new stdclass();

                        $a->userid = $userid;

                        $a->courseid = $courseid;

                        $a->capability = $capability;

                        throw new restore_controller_exception('restore_user_missing_capability', $a);

                    }

                }

        }

        // Now, enforce 'moodle/restore:userinfo' to 'users' setting, applying changes if allowed,

        // else throwing exception

        $userssetting = $restore_controller->get_plan()->get_setting('users');

        $prevvalue    = $userssetting->get_value();

        $prevstatus   = $userssetting->get_status();

        $hasusercap   = has_capability('moodle/restore:userinfo', $coursectx, $userid);

        // If setting is enabled but user lacks permission

        if (!$hasusercap && $prevvalue) { // If user has not the capability and setting is enabled

            // Now analyse if we are allowed to apply changes or must stop with exception

            if (!$apply) { // Cannot apply changes, throw exception

                $a = new stdclass();

                $a->setting = 'users';

                $a->value = $prevvalue;

                $a->capability = 'moodle/restore:userinfo';

                throw new restore_controller_exception('restore_setting_value_wrong_for_capability', $a);

            } else { // Can apply changes

                $userssetting->set_value(false);                              // Set the value to false

                $userssetting->set_status(base_setting::LOCKED_BY_PERMISSION);// Set the status to locked by perm

            }

        }

        // Now, if mode is HUB or IMPORT, and still we are including users in restore, turn them off

        // Defaults processing should have handled this, but we need to be 100% sure

        if ($mode == backup::MODE_IMPORT || $mode == backup::MODE_HUB) {

            $userssetting = $restore_controller->get_plan()->get_setting('users');

            if ($userssetting->get_value()) {

                $userssetting->set_value(false);                              // Set the value to false

                $userssetting->set_status(base_setting::LOCKED_BY_PERMISSION);// Set the status to locked by perm

            }

        }

        // Check the user has the ability to configure the restore. If not then we need

        // to lock all settings by permission so that no changes can be made. This does

        // not apply to the import facility, where all the activities (picked on backup)

        // are restored automatically without restore UI

        if ($mode != backup::MODE_IMPORT) {

            $hasconfigcap = has_capability('moodle/restore:configure', $coursectx, $userid);

            if (!$hasconfigcap) {

                $settings = $restore_controller->get_plan()->get_settings();

                foreach ($settings as $setting) {

                    $setting->set_status(base_setting::LOCKED_BY_PERMISSION);

                }

            }

        }

        if ($type == backup::TYPE_1COURSE) {

            // Ensure the user has the rolldates capability. If not we want to lock this

            // settings so that they cannot change it.

            $hasrolldatescap = has_capability('moodle/restore:rolldates', $coursectx, $userid);

            if (!$hasrolldatescap) {

                $startdatesetting = $restore_controller->get_plan()->get_setting('course_startdate');

                if ($startdatesetting) {

                    $startdatesetting->set_status(base_setting::NOT_LOCKED); // Permission lock overrides config lock.

                    $startdatesetting->set_value(false);

                    $startdatesetting->set_status(base_setting::LOCKED_BY_PERMISSION);

                }

            }

            // Ensure the user has the changefullname capability. If not we want to lock

            // the setting so that they cannot change it.

            $haschangefullnamecap = has_capability('moodle/course:changefullname', $coursectx, $userid);

            if (!$haschangefullnamecap) {

                $fullnamesetting = $restore_controller->get_plan()->get_setting('course_fullname');

                $fullnamesetting->set_status(base_setting::NOT_LOCKED); // Permission lock overrides config lock.

                $fullnamesetting->set_value(false);

                $fullnamesetting->set_status(base_setting::LOCKED_BY_PERMISSION);

            }

            // Ensure the user has the changeshortname capability. If not we want to lock

            // the setting so that they cannot change it.

            $haschangeshortnamecap = has_capability('moodle/course:changeshortname', $coursectx, $userid);

            if (!$haschangeshortnamecap) {

                $shortnamesetting = $restore_controller->get_plan()->get_setting('course_shortname');

                $shortnamesetting->set_status(base_setting::NOT_LOCKED); // Permission lock overrides config lock.

                $shortnamesetting->set_value(false);

                $shortnamesetting->set_status(base_setting::LOCKED_BY_PERMISSION);

            }

            // Ensure the user has the update capability. If not we want to lock

            // the overwrite setting so that they cannot change it.

            $hasupdatecap = has_capability('moodle/course:update', $coursectx, $userid);

            if (!$hasupdatecap) {

                $overwritesetting = $restore_controller->get_plan()->get_setting('overwrite_conf');

                $overwritesetting->set_status(base_setting::NOT_LOCKED); // Permission lock overrides config lock.

                $overwritesetting->set_value(false);

                $overwritesetting->set_status(base_setting::LOCKED_BY_PERMISSION);

            }

            // Ensure the user has the capability to manage enrolment methods. If not we want to unset and lock

            // the setting so that they cannot change it.

            $hasmanageenrolcap = has_capability('moodle/course:enrolconfig', $coursectx, $userid);

            if (!$hasmanageenrolcap) {

                if ($restore_controller->get_plan()->setting_exists('enrolments')) {

                    $enrolsetting = $restore_controller->get_plan()->get_setting('enrolments');

                    if ($enrolsetting->get_value() != backup::ENROL_NEVER) {

                        $enrolsetting->set_status(base_setting::NOT_LOCKED); // In case it was locked earlier.

                        $enrolsetting->set_value(backup::ENROL_NEVER);

                    }

                    $enrolsetting->set_status(base_setting::LOCKED_BY_PERMISSION);

                }

            }

        }

        return true;

    }

}