3 // This file is part of Moodle - http://moodle.org/
5 // Moodle is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
10 // Moodle is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
15 // You should have received a copy of the GNU General Public License
16 // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
20 * @subpackage backup-helper
21 * @copyright 2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
25 defined('MOODLE_INTERNAL') || die();
28 * Non instantiable helper class providing general helper methods for backup/restore
30 * This class contains various general helper static methods available for backup/restore
32 * TODO: Finish phpdocs
34 abstract class backup_general_helper extends backup_helper {
37 * Calculate one checksum for any array/object. Works recursively
39 public static function array_checksum_recursive($arr) {
41 $checksum = ''; // Init checksum
43 // Check we are going to process one array always, objects must be cast before
44 if (!is_array($arr)) {
45 throw new backup_helper_exception('array_expected');
47 foreach ($arr as $key => $value) {
48 if ($value instanceof checksumable) {
49 $checksum = md5($checksum . '-' . $key . '-' . $value->calculate_checksum());
50 } else if (is_object($value)) {
51 $checksum = md5($checksum . '-' . $key . '-' . self::array_checksum_recursive((array)$value));
52 } else if (is_array($value)) {
53 $checksum = md5($checksum . '-' . $key . '-' . self::array_checksum_recursive($value));
55 $checksum = md5($checksum . '-' . $key . '-' . $value);
62 * Load all the blocks information needed for a given path within moodle2 backup
64 * This function, given one full path (course, activities/xxxx) will look for all the
65 * blocks existing in the backup file, returning one array used to build the
66 * proper restore plan by the @restore_plan_builder
68 public static function get_blocks_from_path($path) {
71 $blocks = array(); // To return results
73 static $availableblocks = array(); // Get and cache available blocks
74 if (empty($availableblocks)) {
75 $availableblocks = array_keys(core_component::get_plugin_list('block'));
78 $path = $path . '/blocks'; // Always look under blocks subdir
84 if (!$dir = opendir($path)) {
87 while (false !== ($file = readdir($dir))) {
88 if ($file == '.' || $file == '..') { // Skip dots
91 if (is_dir($path .'/' . $file)) { // Dir found, check it's a valid block
92 if (!file_exists($path .'/' . $file . '/block.xml')) { // Skip if xml file not found
96 $blockname = preg_replace('/(.*)_\d+/', '\\1', $file);
97 // Check block exists and is installed
98 if (in_array($blockname, $availableblocks) && $DB->record_exists('block', array('name' => $blockname))) {
99 $blocks[$path .'/' . $file] = $blockname;
109 * Load and format all the needed information from moodle_backup.xml
111 * This function loads and process all the moodle_backup.xml
112 * information, composing a big information structure that will
113 * be the used by the plan builder in order to generate the
114 * appropiate tasks / steps / settings
116 public static function get_backup_information($tempdir) {
119 $info = new stdclass(); // Final information goes here
121 $moodlefile = $CFG->tempdir . '/backup/' . $tempdir . '/moodle_backup.xml';
122 if (!file_exists($moodlefile)) { // Shouldn't happen ever, but...
123 throw new backup_helper_exception('missing_moodle_backup_xml_file', $moodlefile);
125 // Load the entire file to in-memory array
126 $xmlparser = new progressive_parser();
127 $xmlparser->set_file($moodlefile);
128 $xmlprocessor = new restore_moodlexml_parser_processor();
129 $xmlparser->set_processor($xmlprocessor);
130 $xmlparser->process();
131 $infoarr = $xmlprocessor->get_all_chunks();
132 if (count($infoarr) !== 1) { // Shouldn't happen ever, but...
133 throw new backup_helper_exception('problem_parsing_moodle_backup_xml_file');
135 $infoarr = $infoarr[0]['tags']; // for commodity
138 $info->moodle_version = $infoarr['moodle_version'];
139 $info->moodle_release = $infoarr['moodle_release'];
140 $info->backup_version = $infoarr['backup_version'];
141 $info->backup_release = $infoarr['backup_release'];
142 $info->backup_date = $infoarr['backup_date'];
143 $info->mnet_remoteusers = $infoarr['mnet_remoteusers'];
144 $info->original_wwwroot = $infoarr['original_wwwroot'];
145 $info->original_site_identifier_hash = $infoarr['original_site_identifier_hash'];
146 $info->original_course_id = $infoarr['original_course_id'];
147 $info->original_course_fullname = $infoarr['original_course_fullname'];
148 $info->original_course_shortname= $infoarr['original_course_shortname'];
149 $info->original_course_startdate= $infoarr['original_course_startdate'];
150 $info->original_course_contextid= $infoarr['original_course_contextid'];
151 $info->original_system_contextid= $infoarr['original_system_contextid'];
152 // Moodle backup file don't have this option before 2.3
153 if (!empty($infoarr['include_file_references_to_external_content'])) {
154 $info->include_file_references_to_external_content = 1;
156 $info->include_file_references_to_external_content = 0;
158 // Introduced in Moodle 2.9.
159 $info->original_course_format = '';
160 if (!empty($infoarr['original_course_format'])) {
161 $info->original_course_format = $infoarr['original_course_format'];
163 // include_files is a new setting in 2.6.
164 if (isset($infoarr['include_files'])) {
165 $info->include_files = $infoarr['include_files'];
167 $info->include_files = 1;
169 $info->type = $infoarr['details']['detail'][0]['type'];
170 $info->format = $infoarr['details']['detail'][0]['format'];
171 $info->mode = $infoarr['details']['detail'][0]['mode'];
172 // Build the role mappings custom object
173 $rolemappings = new stdclass();
174 $rolemappings->modified = false;
175 $rolemappings->mappings = array();
176 $info->role_mappings = $rolemappings;
177 // Some initially empty containers
178 $info->sections = array();
179 $info->activities = array();
182 $contentsarr = $infoarr['contents'];
183 if (isset($contentsarr['course']) && isset($contentsarr['course'][0])) {
184 $info->course = new stdclass();
185 $info->course = (object)$contentsarr['course'][0];
186 $info->course->settings = array();
188 if (isset($contentsarr['sections']) && isset($contentsarr['sections']['section'])) {
189 $sectionarr = $contentsarr['sections']['section'];
190 foreach ($sectionarr as $section) {
191 $section = (object)$section;
192 $section->settings = array();
193 $sections[basename($section->directory)] = $section;
195 $info->sections = $sections;
197 if (isset($contentsarr['activities']) && isset($contentsarr['activities']['activity'])) {
198 $activityarr = $contentsarr['activities']['activity'];
199 foreach ($activityarr as $activity) {
200 $activity = (object)$activity;
201 $activity->settings = array();
202 $activities[basename($activity->directory)] = $activity;
204 $info->activities = $activities;
206 $info->root_settings = array(); // For root settings
208 // Now the settings, putting each one under its owner
209 $settingsarr = $infoarr['settings']['setting'];
210 foreach($settingsarr as $setting) {
211 switch ($setting['level']) {
213 $info->root_settings[$setting['name']] = $setting['value'];
216 $info->course->settings[$setting['name']] = $setting['value'];
219 $info->sections[$setting['section']]->settings[$setting['name']] = $setting['value'];
222 $info->activities[$setting['activity']]->settings[$setting['name']] = $setting['value'];
224 default: // Shouldn't happen
225 throw new backup_helper_exception('wrong_setting_level_moodle_backup_xml_file', $setting['level']);
233 * Load and format all the needed information from a backup file.
235 * This will only extract the moodle_backup.xml file from an MBZ
236 * file and then call {@link self::get_backup_information()}.
238 * This can be a long-running (multi-minute) operation for large backups.
239 * Pass a $progress value to receive progress updates.
241 * @param string $filepath absolute path to the MBZ file.
242 * @param file_progress $progress Progress updates
243 * @return stdClass containing information.
246 public static function get_backup_information_from_mbz($filepath, file_progress $progress = null) {
248 if (!is_readable($filepath)) {
249 throw new backup_helper_exception('missing_moodle_backup_file', $filepath);
252 // Extract moodle_backup.xml.
253 $tmpname = 'info_from_mbz_' . time() . '_' . random_string(4);
254 $tmpdir = $CFG->tempdir . '/backup/' . $tmpname;
255 $fp = get_file_packer('application/vnd.moodle.backup');
257 $extracted = $fp->extract_to_pathname($filepath, $tmpdir, array('moodle_backup.xml'), $progress);
258 $moodlefile = $tmpdir . '/' . 'moodle_backup.xml';
259 if (!$extracted || !is_readable($moodlefile)) {
260 throw new backup_helper_exception('missing_moodle_backup_xml_file', $moodlefile);
263 // Read the information and delete the temporary directory.
264 $info = self::get_backup_information($tmpname);
270 * Given the information fetched from moodle_backup.xml file
271 * decide if we are restoring in the same site the backup was
272 * generated or no. Behavior of various parts of restore are
275 * Backups created natively in 2.0 and later declare the hashed
276 * site identifier. Backups created by conversion from a 1.9
277 * backup do not declare such identifier, so there is a fallback
278 * to wwwroot comparison. See MDL-16614.
280 public static function backup_is_samesite($info) {
282 $hashedsiteid = md5(get_site_identifier());
283 if (isset($info->original_site_identifier_hash) && !empty($info->original_site_identifier_hash)) {
284 return $info->original_site_identifier_hash == $hashedsiteid;
286 return $info->original_wwwroot == $CFG->wwwroot;
291 * Detects the format of the given unpacked backup directory
293 * @param string $tempdir the name of the backup directory
294 * @return string one of backup::FORMAT_xxx constants
296 public static function detect_backup_format($tempdir) {
298 require_once($CFG->dirroot . '/backup/util/helper/convert_helper.class.php');
300 if (convert_helper::detect_moodle2_format($tempdir)) {
301 return backup::FORMAT_MOODLE;
304 // see if a converter can identify the format
305 $converters = convert_helper::available_converters();
306 foreach ($converters as $name) {
307 $classname = "{$name}_converter";
308 if (!class_exists($classname)) {
309 throw new coding_exception("available_converters() is supposed to load
310 converter classes but class $classname not found");
313 $detected = call_user_func($classname .'::detect_format', $tempdir);
314 if (!empty($detected)) {
319 return backup::FORMAT_UNKNOWN;