mirror of
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125 lines
4.2 KiB
PHP
125 lines
4.2 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* @package core
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* @subpackage backup-convert
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* @copyright 2011 Mark Nielsen <mark@moodlerooms.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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/**
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* General convert helper
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*/
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abstract class convert_helper {
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public static function generate_id($entropy) {
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return md5(time() . '-' . $entropy . '-' . random_string(20));
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}
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/**
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* @static
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* @throws coding_exception|restore_controller_exception
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* @param string $tempdir The directory to convert
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* @param string $format The current format, if already detected
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* @return void
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*/
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public static function to_moodle2_format($tempdir, $format = NULL) {
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if (is_null($format)) {
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$format = backup_general_helper::detect_backup_format($tempdir);
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}
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while (!in_array($format, array(backup::FORMAT_MOODLE, backup::FORMAT_UNKNOWN))) {
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$converter = convert_factory::converter($format, $tempdir);
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if (!$converter->can_convert()) {
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throw new coding_exception('Converter detection failed, the loaded converter cannot convert this format');
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}
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$converter->convert();
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// Re-detect format
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$format = backup_general_helper::detect_backup_format($tempdir);
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}
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if ($format == backup::FORMAT_UNKNOWN) {
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throw new restore_controller_exception('cannot_convert_from_unknown_format'); // @todo Change exception class
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}
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}
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/**
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* Inserts an inforef into the conversion temp table
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*/
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public static function set_inforef($contextid) {
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global $DB;
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}
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public static function get_inforef($contextid) {
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}
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/**
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* Converts a plain old php object (popo?) into a string...
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* Useful for debuging failed db inserts, or anything like that
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*/
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public static function obj_to_readable($obj) {
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$mapper = function($field, $value) { return "$field=$value"; };
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$fields = get_object_vars($obj);
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return implode(", ", array_map($mapper, array_keys($fields), array_values($fields)));
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}
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/**
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* Generate an artificial context ID
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*
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* @static
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* @throws Exception
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* @param int $instance The moodle component instance ID, same value used for get_context_instance()
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* @param string $component The moodle component, like block_html, mod_quiz, etc
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* @param string $converterid The converter ID
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* @return int
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* @todo Add caching?
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* @todo Can we make the lookup faster? Not taking advantage of indexes
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*/
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public static function get_contextid($instance, $component = 'moodle', $converterid = NULL) {
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global $DB;
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// Attempt to retrieve the contextid
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$contextid = $DB->get_field_select('backup_ids_temp', 'id',
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$DB->sql_compare_text('info', 100).' = ? AND itemid = ? AND itemname = ?',
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array($component, $instance, 'context')
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);
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if (!empty($contextid)) {
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return $contextid;
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}
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$context = new stdClass;
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$context->itemid = $instance;
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$context->itemname = 'context';
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$context->info = $component;
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if (!is_null($converterid)) {
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$context->backupid = $converterid;
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}
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if ($id = $DB->insert_record('backup_ids_temp', $context)) {
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return $id;
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} else {
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$msg = self::obj_to_readable($context);
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throw new Exception(sprintf("Could not insert context record into temp table: %s", $msg));
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}
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}
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}
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