MDL-41838 Backup/restore: Support .tar.gz format for .mbz (2 of 2)
[moodle.git] / backup / util / helper / backup_general_helper.class.php
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1<?php
2
3// This file is part of Moodle - http://moodle.org/
4//
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.
9//
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.
14//
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/>.
17
18/**
19 * @package moodlecore
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
23 */
24
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25defined('MOODLE_INTERNAL') || die();
26
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27/**
28 * Non instantiable helper class providing general helper methods for backup/restore
29 *
30 * This class contains various general helper static methods available for backup/restore
31 *
32 * TODO: Finish phpdocs
33 */
34abstract class backup_general_helper extends backup_helper {
35
36 /**
37 * Calculate one checksum for any array/object. Works recursively
38 */
39 public static function array_checksum_recursive($arr) {
40
41 $checksum = ''; // Init checksum
42
43 // Check we are going to process one array always, objects must be cast before
44 if (!is_array($arr)) {
45 throw new backup_helper_exception('array_expected');
46 }
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));
54 } else {
55 $checksum = md5($checksum . '-' . $key . '-' . $value);
56 }
57 }
58 return $checksum;
59 }
f60f4666 60
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61 /**
62 * Load all the blocks information needed for a given path within moodle2 backup
63 *
64 * This function, given one full path (course, activities/xxxx) will look for all the
65 * blocks existing in the backup file, returning one array used to build the
66 * proper restore plan by the @restore_plan_builder
67 */
68 public static function get_blocks_from_path($path) {
69 global $DB;
70
71 $blocks = array(); // To return results
72
73 static $availableblocks = array(); // Get and cache available blocks
74 if (empty($availableblocks)) {
bd3b3bba 75 $availableblocks = array_keys(core_component::get_plugin_list('block'));
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76 }
77
78 $path = $path . '/blocks'; // Always look under blocks subdir
79
80 if (!is_dir($path)) {
81 return array();
82 }
83
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84 if (!$dir = opendir($path)) {
85 return array();
86 }
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87 while (false !== ($file = readdir($dir))) {
88 if ($file == '.' || $file == '..') { // Skip dots
89 continue;
90 }
91 if (is_dir($path .'/' . $file)) { // Dir found, check it's a valid block
92 if (!file_exists($path .'/' . $file . '/block.xml')) { // Skip if xml file not found
93 continue;
94 }
95 // Extract block name
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] = $blockname;
100 }
101 }
102 }
103 closedir($dir);
104
105 return $blocks;
106 }
107
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108 /**
109 * Load and format all the needed information from moodle_backup.xml
110 *
111 * This function loads and process all the moodle_backup.xml
112 * information, composing a big information structure that will
113 * be the used by the plan builder in order to generate the
114 * appropiate tasks / steps / settings
115 */
116 public static function get_backup_information($tempdir) {
117 global $CFG;
118
119 $info = new stdclass(); // Final information goes here
120
7aa06e6d 121 $moodlefile = $CFG->tempdir . '/backup/' . $tempdir . '/moodle_backup.xml';
dc5a2f8a 122 if (!file_exists($moodlefile)) { // Shouldn't happen ever, but...
482aac65 123 throw new backup_helper_exception('missing_moodle_backup_xml_file', $moodlefile);
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124 }
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');
134 }
135 $infoarr = $infoarr[0]['tags']; // for commodity
136
137 // Let's build info
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'];
c3ea499d 143 $info->mnet_remoteusers = $infoarr['mnet_remoteusers'];
dc5a2f8a 144 $info->original_wwwroot = $infoarr['original_wwwroot'];
482aac65 145 $info->original_site_identifier_hash = $infoarr['original_site_identifier_hash'];
dc5a2f8a 146 $info->original_course_id = $infoarr['original_course_id'];
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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'];
2df0f295 150 $info->original_course_contextid= $infoarr['original_course_contextid'];
3a1cccc6 151 $info->original_system_contextid= $infoarr['original_system_contextid'];
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152 // Moodle backup file don't have this option before 2.3
153 if (!empty($infoarr['include_file_references_to_external_content'])) {
154 $info->include_file_references_to_external_content = 1;
155 } else {
156 $info->include_file_references_to_external_content = 0;
157 }
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158 // include_files is a new setting in 2.6.
159 if (isset($infoarr['include_files'])) {
160 $info->include_files = $infoarr['include_files'];
161 } else {
162 $info->include_files = 1;
163 }
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164 $info->type = $infoarr['details']['detail'][0]['type'];
165 $info->format = $infoarr['details']['detail'][0]['format'];
166 $info->mode = $infoarr['details']['detail'][0]['mode'];
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167 // Build the role mappings custom object
168 $rolemappings = new stdclass();
169 $rolemappings->modified = false;
170 $rolemappings->mappings = array();
171 $info->role_mappings = $rolemappings;
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172 // Some initially empty containers
173 $info->sections = array();
174 $info->activities = array();
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175
176 // Now the contents
177 $contentsarr = $infoarr['contents'];
178 if (isset($contentsarr['course']) && isset($contentsarr['course'][0])) {
179 $info->course = new stdclass();
180 $info->course = (object)$contentsarr['course'][0];
181 $info->course->settings = array();
182 }
183 if (isset($contentsarr['sections']) && isset($contentsarr['sections']['section'])) {
184 $sectionarr = $contentsarr['sections']['section'];
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185 foreach ($sectionarr as $section) {
186 $section = (object)$section;
187 $section->settings = array();
188 $sections[basename($section->directory)] = $section;
189 }
190 $info->sections = $sections;
191 }
192 if (isset($contentsarr['activities']) && isset($contentsarr['activities']['activity'])) {
193 $activityarr = $contentsarr['activities']['activity'];
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194 foreach ($activityarr as $activity) {
195 $activity = (object)$activity;
196 $activity->settings = array();
197 $activities[basename($activity->directory)] = $activity;
198 }
199 $info->activities = $activities;
200 }
201 $info->root_settings = array(); // For root settings
202
203 // Now the settings, putting each one under its owner
204 $settingsarr = $infoarr['settings']['setting'];
205 foreach($settingsarr as $setting) {
206 switch ($setting['level']) {
207 case 'root':
208 $info->root_settings[$setting['name']] = $setting['value'];
209 break;
210 case 'course':
211 $info->course->settings[$setting['name']] = $setting['value'];
212 break;
213 case 'section':
214 $info->sections[$setting['section']]->settings[$setting['name']] = $setting['value'];
215 break;
216 case 'activity':
217 $info->activities[$setting['activity']]->settings[$setting['name']] = $setting['value'];
218 break;
219 default: // Shouldn't happen
220 throw new backup_helper_exception('wrong_setting_level_moodle_backup_xml_file', $setting['level']);
221 }
222 }
223
224 return $info;
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225 }
226
227 /**
228 * Load and format all the needed information from a backup file.
229 *
230 * This will only extract the moodle_backup.xml file from an MBZ
231 * file and then call {@link self::get_backup_information()}.
232 *
233 * @param string $filepath absolute path to the MBZ file.
234 * @return stdClass containing information.
235 * @since 2.4
236 */
237 public static function get_backup_information_from_mbz($filepath) {
238 global $CFG;
239 if (!is_readable($filepath)) {
240 throw new backup_helper_exception('missing_moodle_backup_file', $filepath);
241 }
242
243 // Extract moodle_backup.xml.
244 $tmpname = 'info_from_mbz_' . time() . '_' . random_string(4);
245 $tmpdir = $CFG->tempdir . '/backup/' . $tmpname;
39e5102f 246 $packer = get_file_packer('application/vnd.moodle.backup');
247
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248 $extracted = $fp->extract_to_pathname($filepath, $tmpdir, array('moodle_backup.xml'));
249 $moodlefile = $tmpdir . '/' . 'moodle_backup.xml';
250 if (!$extracted || !is_readable($moodlefile)) {
251 throw new backup_helper_exception('missing_moodle_backup_xml_file', $moodlefile);
252 }
253
254 // Read the information and delete the temporary directory.
255 $info = self::get_backup_information($tmpname);
256 remove_dir($tmpdir);
257 return $info;
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258 }
259
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260 /**
261 * Given the information fetched from moodle_backup.xml file
262 * decide if we are restoring in the same site the backup was
263 * generated or no. Behavior of various parts of restore are
264 * dependent of this.
265 *
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266 * Backups created natively in 2.0 and later declare the hashed
267 * site identifier. Backups created by conversion from a 1.9
268 * backup do not declare such identifier, so there is a fallback
269 * to wwwroot comparison. See MDL-16614.
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270 */
271 public static function backup_is_samesite($info) {
272 global $CFG;
273 $hashedsiteid = md5(get_site_identifier());
274 if (isset($info->original_site_identifier_hash) && !empty($info->original_site_identifier_hash)) {
275 return $info->original_site_identifier_hash == $hashedsiteid;
276 } else {
277 return $info->original_wwwroot == $CFG->wwwroot;
278 }
279 }
280
f60f4666 281 /**
0164592b 282 * Detects the format of the given unpacked backup directory
f60f4666 283 *
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284 * @param string $tempdir the name of the backup directory
285 * @return string one of backup::FORMAT_xxx constants
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286 */
287 public static function detect_backup_format($tempdir) {
288 global $CFG;
1e2c7351 289 require_once($CFG->dirroot . '/backup/util/helper/convert_helper.class.php');
90338ad1 290
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291 if (convert_helper::detect_moodle2_format($tempdir)) {
292 return backup::FORMAT_MOODLE;
90338ad1 293 }
f60f4666 294
0164592b 295 // see if a converter can identify the format
383f6f63 296 $converters = convert_helper::available_converters();
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297 foreach ($converters as $name) {
298 $classname = "{$name}_converter";
299 if (!class_exists($classname)) {
300 throw new coding_exception("available_converters() is supposed to load
301 converter classes but class $classname not found");
f60f4666 302 }
f60f4666 303
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304 $detected = call_user_func($classname .'::detect_format', $tempdir);
305 if (!empty($detected)) {
306 return $detected;
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307 }
308 }
309
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310 return backup::FORMAT_UNKNOWN;
311 }
69dd0c8c 312}