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-dbops

 * @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 DB support to the @restore_controller

 *

 * This class contains various static methods available for all the DB operations

 * performed by the restore_controller class

 *

 * TODO: Finish phpdocs

 */

abstract class restore_controller_dbops extends restore_dbops {

    /**

     * Send one restore controller to DB

     *

     * @param restore_controller $controller controller to send to DB

     * @param string $checksum hash of the controller to be checked

     * @param bool $includeobj to decide if the object itself must be updated (true) or no (false)

     * @param bool $cleanobj to decide if the object itself must be cleaned (true) or no (false)

     * @return int id of the controller record in the DB

     * @throws backup_controller_exception|restore_dbops_exception

     */

    public static function save_controller($controller, $checksum, $includeobj = true, $cleanobj = false) {

        global $DB;

        // Check we are going to save one backup_controller

        if (! $controller instanceof restore_controller) {

            throw new backup_controller_exception('restore_controller_expected');

        }

        // Check checksum is ok. Only if we are including object info. Sounds silly but it isn't ;-).

        if ($includeobj and !$controller->is_checksum_correct($checksum)) {

            throw new restore_dbops_exception('restore_controller_dbops_saving_checksum_mismatch');

        }

        // Cannot request to $includeobj and $cleanobj at the same time.

        if ($includeobj and $cleanobj) {

            throw new restore_dbops_exception('restore_controller_dbops_saving_cannot_include_and_delete');

        }

        // Get all the columns

        $rec = new stdclass();

        $rec->backupid     = $controller->get_restoreid();

        $rec->operation    = $controller->get_operation();

        $rec->type         = $controller->get_type();

        $rec->itemid       = $controller->get_courseid();

        $rec->format       = $controller->get_format();

        $rec->interactive  = $controller->get_interactive();

        $rec->purpose      = $controller->get_mode();

        $rec->userid       = $controller->get_userid();

        $rec->status       = $controller->get_status();

        $rec->execution    = $controller->get_execution();

        $rec->executiontime= $controller->get_executiontime();

        $rec->checksum     = $checksum;

        // Serialize information

        if ($includeobj) {

            $rec->controller = base64_encode(serialize($controller));

        } else if ($cleanobj) {

            $rec->controller = '';

        }

        // Send it to DB

        if ($recexists = $DB->get_record('backup_controllers', array('backupid' => $rec->backupid))) {

            $rec->id = $recexists->id;

            $rec->timemodified = time();

            $DB->update_record('backup_controllers', $rec);

        } else {

            $rec->timecreated = time();

            $rec->timemodified = 0;

            $rec->id = $DB->insert_record('backup_controllers', $rec);

        }

        return $rec->id;

    }

    public static function load_controller($restoreid) {

        global $DB;

        if (! $controllerrec = $DB->get_record('backup_controllers', array('backupid' => $restoreid))) {

            throw new backup_dbops_exception('restore_controller_dbops_nonexisting');

        }

        $controller = unserialize(base64_decode($controllerrec->controller));

        if (!is_object($controller)) {

            // The controller field of the table did not contain a serialized object.

            // It is made empty after it has been used successfully, it is likely that

            // the user has pressed the browser back button at some point.

            throw new backup_dbops_exception('restore_controller_dbops_loading_invalid_controller');

        }

        // Check checksum is ok. Sounds silly but it isn't ;-)

        if (!$controller->is_checksum_correct($controllerrec->checksum)) {

            throw new backup_dbops_exception('restore_controller_dbops_loading_checksum_mismatch');

        }

        return $controller;

    }

    public static function create_restore_temp_tables($restoreid) {

        global $CFG, $DB;

        $dbman = $DB->get_manager(); // We are going to use database_manager services

        if ($dbman->table_exists('backup_ids_temp')) { // Table exists, from restore prechecks

            // TODO: Improve this by inserting/selecting some record to see there is restoreid match

            // TODO: If not match, exception, table corresponds to another backup/restore operation

            return true;

        }

        backup_controller_dbops::create_backup_ids_temp_table($restoreid);

        backup_controller_dbops::create_backup_files_temp_table($restoreid);

        return false;

    }

    public static function drop_restore_temp_tables($backupid) {

        global $DB;

        $dbman = $DB->get_manager(); // We are going to use database_manager services

        $targettablenames = array('backup_ids_temp', 'backup_files_temp');

        foreach ($targettablenames as $targettablename) {

            $table = new xmldb_table($targettablename);

            $dbman->drop_table($table); // And drop it

        }

        // Invalidate the backup_ids caches.

        restore_dbops::reset_backup_ids_cached();

    }

    /**

     * Sets the default values for the settings in a restore operation

     *

     * @param restore_controller $controller

     */

    public static function apply_config_defaults(restore_controller $controller) {

        $settings = array(

            'restore_general_users'              => 'users',

            'restore_general_enrolments'         => 'enrolments',

            'restore_general_role_assignments'   => 'role_assignments',

            'restore_general_permissions'        => 'permissions',

            'restore_general_activities'         => 'activities',

            'restore_general_blocks'             => 'blocks',

            'restore_general_filters'            => 'filters',

            'restore_general_comments'           => 'comments',

            'restore_general_badges'             => 'badges',

            'restore_general_calendarevents'     => 'calendarevents',

            'restore_general_userscompletion'    => 'userscompletion',

            'restore_general_logs'               => 'logs',

            'restore_general_histories'          => 'grade_histories',

            'restore_general_questionbank'       => 'questionbank',

            'restore_general_groups'             => 'groups',

            'restore_general_competencies'       => 'competencies',

            'restore_general_contentbankcontent' => 'contentbankcontent',

            'restore_general_xapistate'          => 'xapistate',

            'restore_general_legacyfiles'        => 'legacyfiles'

        );

        self::apply_admin_config_defaults($controller, $settings, true);

        $target = $controller->get_target();

        if ($target == backup::TARGET_EXISTING_ADDING || $target == backup::TARGET_CURRENT_ADDING) {

            $settings = array(

                'restore_merge_overwrite_conf'  => 'overwrite_conf',

                'restore_merge_course_fullname'  => 'course_fullname',

                'restore_merge_course_shortname' => 'course_shortname',

                'restore_merge_course_startdate' => 'course_startdate',

            );

            self::apply_admin_config_defaults($controller, $settings, true);

        }

        if ($target == backup::TARGET_EXISTING_DELETING || $target == backup::TARGET_CURRENT_DELETING) {

            $settings = array(

                'restore_replace_overwrite_conf'  => 'overwrite_conf',

                'restore_replace_course_fullname'  => 'course_fullname',

                'restore_replace_course_shortname' => 'course_shortname',

                'restore_replace_course_startdate' => 'course_startdate',

                'restore_replace_keep_roles_and_enrolments' => 'keep_roles_and_enrolments',

                'restore_replace_keep_groups_and_groupings' => 'keep_groups_and_groupings',

            );

            self::apply_admin_config_defaults($controller, $settings, true);

        }

        if ($controller->get_mode() == backup::MODE_IMPORT &&

                (!$controller->get_interactive()) &&

                $controller->get_type() == backup::TYPE_1ACTIVITY) {

            // This is duplicate - there is no concept of defaults - these settings must be on.

            $settings = array(

                    'activities',

                    'blocks',

                    'filters',

                    'questionbank'

            );

            self::force_enable_settings($controller, $settings);

        };

        // Add some dependencies.

        $plan = $controller->get_plan();

        if ($plan->setting_exists('overwrite_conf')) {

            /** @var restore_course_overwrite_conf_setting $overwriteconf */

            $overwriteconf = $plan->get_setting('overwrite_conf');

            if ($overwriteconf->get_visibility()) {

                foreach (['course_fullname', 'course_shortname', 'course_startdate'] as $settingname) {

                    if ($plan->setting_exists($settingname)) {

                        $setting = $plan->get_setting($settingname);

                        $overwriteconf->add_dependency($setting, setting_dependency::DISABLED_FALSE,

                            array('defaultvalue' => $setting->get_value()));

                    }

                }

            }

        }

    }

    /**

     * Returns the default value to be used for a setting from the admin restore config

     *

     * @param string $config

     * @param backup_setting $setting

     * @return mixed

     */

    private static function get_setting_default($config, $setting) {

        $value = get_config('restore', $config);

        if (in_array($setting->get_name(), ['course_fullname', 'course_shortname', 'course_startdate']) &&

                $setting->get_ui() instanceof backup_setting_ui_defaultcustom) {

            // Special case - admin config settings course_fullname, etc. are boolean and the restore settings are strings.

            $value = (bool)$value;

            if ($value) {

                $attributes = $setting->get_ui()->get_attributes();

                $value = $attributes['customvalue'];

            }

        }

        if ($setting->get_ui() instanceof backup_setting_ui_select) {

            // Make sure the value is a valid option in the select element, otherwise just pick the first from the options list.

            // Example: enrolments dropdown may not have the "enrol_withusers" option because users info can not be restored.

            $options = array_keys($setting->get_ui()->get_values());

            if (!in_array($value, $options)) {

                $value = reset($options);

            }

        }

        return $value;

    }

    /**

     * Turn these settings on. No defaults from admin settings.

     *

     * @param restore_controller $controller

     * @param array $settings a map from admin config names to setting names (Config name => Setting name)

     */

    private static function force_enable_settings(restore_controller $controller, array $settings) {

        $plan = $controller->get_plan();

        foreach ($settings as $config => $settingname) {

            $value = true;

            if ($plan->setting_exists($settingname)) {

                $setting = $plan->get_setting($settingname);

                // We do not allow this setting to be locked for a duplicate function.

                if ($setting->get_status() !== base_setting::NOT_LOCKED) {

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

                }

                $setting->set_value($value);

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

            } else {

                $controller->log('Unknown setting: ' . $settingname, BACKUP::LOG_DEBUG);

            }

        }

    }

    /**

     * Sets the controller settings default values from the admin config.

     *

     * @param restore_controller $controller

     * @param array $settings a map from admin config names to setting names (Config name => Setting name)

     * @param boolean $uselocks whether "locked" admin settings should be honoured

     */

    private static function apply_admin_config_defaults(restore_controller $controller, array $settings, $uselocks) {

        $plan = $controller->get_plan();

        foreach ($settings as $config => $settingname) {

            if ($plan->setting_exists($settingname)) {

                $setting = $plan->get_setting($settingname);

                $value = self::get_setting_default($config, $setting);

                $locked = (get_config('restore',$config . '_locked') == true);

                // Use the original value when this is an import and the setting is unlocked.

                if ($controller->get_mode() == backup::MODE_IMPORT && $controller->get_interactive()) {

                    if (!$uselocks || !$locked) {

                        $value = $setting->get_value();

                    }

                }

                // We can only update the setting if it isn't already locked by config or permission.

                if ($setting->get_status() != base_setting::LOCKED_BY_CONFIG

                        && $setting->get_status() != base_setting::LOCKED_BY_PERMISSION

                        && $setting->get_ui()->is_changeable()) {

                    $setting->set_value($value);

                    if ($uselocks && $locked) {

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

                    }

                }

            } else {

                $controller->log('Unknown setting: ' . $settingname, BACKUP::LOG_DEBUG);

            }

        }

    }

}