--- /dev/null
+<?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-helper
+ * @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 support for restore prechecks
+ *
+ * This class contains various prechecks to be performed before executing
+ * the restore plan. Its entry point is execute_prechecks() that will
+ * call various stuff. At the end, it will return one array(), if empty
+ * all the prechecks have passed ok. If not empty, you'll find 1/2 elements
+ * in the array, warnings and errors, each one containing one description
+ * of the problem. Warnings aren't stoppers so the restore execution can
+ * continue after displaying them. In the other side, if errors are returned
+ * then restore execution cannot continue
+ *
+ * TODO: Finish phpdocs
+ */
+abstract class restore_prechecks_helper {
+
+ /**
+ * Entry point for all the prechecks to be performed before restore
+ *
+ * Returns empty array or warnings/errors array
+ */
+ public static function execute_prechecks($controller) {
+ global $CFG;
+
+ $errors = array();
+ $warnings = array();
+
+ // Create temp tables
+ restore_controller_dbops::create_restore_temp_tables($controller->get_restoreid());
+
+ // Check we are restoring one backup >= $min20version (very first ok ever)
+ $min20version = 2010071800;
+ if ($controller->get_info()->backup_version < $min20version) {
+ $message = new stdclass();
+ $message->backup = $controller->get_info()->backup_version;
+ $message->min = $min20version;
+ $errors[] = get_string('errorminbackup20version', 'backup', $message);
+ }
+
+ // Compare Moodle's versions
+ if ($CFG->version < $controller->get_info()->moodle_version) {
+ $message = new stdclass();
+ $message->serverversion = $CFG->version;
+ $message->serverrelease = $CFG->release;
+ $message->backupversion = $controller->get_info()->moodle_version;
+ $message->backuprelease = $controller->get_info()->moodle_release;
+ $warnings[] = get_string('noticenewerbackup','',$message);
+ }
+
+ // Error if restoring over frontpage
+ // TODO: Review the whole restore process in order to transform this into one warning (see 1.9)
+ if ($controller->get_courseid() == SITEID) {
+ $errors[] = get_string('errorrestorefrontpage', 'backup');
+ }
+
+ // If restoring to different site and restoring users and backup has mnet users warn/error
+ $samesite = $controller->is_samesite();
+ $restoreusers = $controller->get_plan()->get_setting('users')->get_value();
+ $hasmnetusers = (int)$controller->get_info()->mnet_remoteusers;
+ if (!$samesite && $restoreusers && $hasmnetusers) {
+ // User is admin (can create users at sysctx), warn
+ if (has_capability('moodle/user:create', get_context_instance(CONTEXT_SYSTEM), $controller->get_userid())) {
+ $warnings[] = get_string('mnetrestore_extusers_admin', 'admin');
+ // User not admin
+ } else {
+ $errors[] = get_string('mnetrestore_extusers_noadmin', 'admin');
+ }
+ }
+
+ // If restoring users, check we are able to create all them
+ if ($restoreusers) {
+ $file = $controller->get_plan()->get_basepath() . '/users.xml';
+ $restoreid = $controller->get_restoreid();
+ $courseid = $controller->get_courseid();
+ $userid = $controller->get_userid();
+ $inforeffiles = restore_dbops::get_needed_inforef_files($restoreid); // Get all inforef files
+ foreach ($inforeffiles as $inforeffile) {
+ restore_dbops::load_inforef_to_tempids($restoreid, $inforeffile); // Load each inforef file to temp_ids
+ }
+ restore_dbops::load_users_to_tempids($restoreid, $file); // Load needed users to temp_ids
+ if ($problems = restore_dbops::precheck_included_users($restoreid, $courseid, $userid, $samesite)) {
+ $errors = array_merge($errors, $problems);
+ }
+ }
+
+ // TODO: Perform role_mappings, warning about non-mappable ones being ignored (see 1.9)
+ // (restore won't create roles in any case)
+
+ // Prepare results and return
+ $results = array();
+ if (!empty($errors)) {
+ $results['errors'] = $errors;
+ }
+ if (!empty($warnings)) {
+ $results['warnings'] = $warnings;
+ }
+ // Warnings/errors detected, drop temp tables
+ if (!empty($results)) {
+ restore_controller_dbops::drop_restore_temp_tables($controller->get_restoreid());
+ }
+ return $results;
+ }
+}
+
+/*
+ * Exception class used by all the @restore_prechecks_helper stuff
+ */
+class restore_prechecks_helper_exception extends backup_exception {
+
+ public function __construct($errorcode, $a=NULL, $debuginfo=null) {
+ parent::__construct($errorcode, $a, $debuginfo);
+ }
+}
