backup/backup.php

   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  * This script is used to configure and execute the backup proccess.
  20  *
  21  * @package    core
  22  * @subpackage backup
  23  * @copyright  Moodle
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 define('NO_OUTPUT_BUFFERING', true);
  28
  29 require_once('../config.php');
  30 require_once($CFG->dirroot . '/backup/util/includes/backup_includes.php');
  31 require_once($CFG->dirroot . '/backup/moodle2/backup_plan_builder.class.php');
  32
  33 // Backup of large courses requires extra memory. Use the amount configured
  34 // in admin settings.
  35 raise_memory_limit(MEMORY_EXTRA);
  36
  37 $courseid = required_param('id', PARAM_INT);
  38 $sectionid = optional_param('section', null, PARAM_INT);
  39 $cmid = optional_param('cm', null, PARAM_INT);
  40 $cancel      = optional_param('cancel', '', PARAM_ALPHA);
  41 $previous = optional_param('previous', false, PARAM_BOOL);
  42 /**
  43  * Part of the forms in stages after initial, is POST never GET
  44  */
  45 $backupid = optional_param('backup', false, PARAM_ALPHANUM);
  46
  47 // Determine if we are performing realtime for asynchronous backups.
  48 $backupmode = backup::MODE_GENERAL;
  49 if (async_helper::is_async_enabled()) {
  50     $backupmode = backup::MODE_ASYNC;
  51 }
  52
  53 $courseurl = new moodle_url('/course/view.php', array('id' => $courseid));
  54 $url = new moodle_url('/backup/backup.php', array('id'=>$courseid));
  55 if ($sectionid !== null) {
  56     $url->param('section', $sectionid);
  57 }
  58 if ($cmid !== null) {
  59     $url->param('cm', $cmid);
  60 }
  61 $PAGE->set_url($url);
  62 $PAGE->set_pagelayout('admin');
  63
  64 $id = $courseid;
  65 $cm = null;
  66 $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
  67 $coursecontext = context_course::instance($course->id);
  68 $contextid = $coursecontext->id;
  69 $type = backup::TYPE_1COURSE;
  70 if (!is_null($sectionid)) {
  71     $section = $DB->get_record('course_sections', array('course'=>$course->id, 'id'=>$sectionid), '*', MUST_EXIST);
  72     $type = backup::TYPE_1SECTION;
  73     $id = $sectionid;
  74 }
  75 if (!is_null($cmid)) {
  76     $cm = get_coursemodule_from_id(null, $cmid, $course->id, false, MUST_EXIST);
  77     $type = backup::TYPE_1ACTIVITY;
  78     $id = $cmid;
  79 }
  80 require_login($course, false, $cm);
  81
  82 switch ($type) {
  83     case backup::TYPE_1COURSE :
  84         require_capability('moodle/backup:backupcourse', $coursecontext);
  85         $heading = get_string('backupcourse', 'backup', $course->shortname);
  86         break;
  87     case backup::TYPE_1SECTION :
  88         require_capability('moodle/backup:backupsection', $coursecontext);
  89         if ((string)$section->name !== '') {
  90             $sectionname = format_string($section->name, true, array('context' => $coursecontext));
  91             $heading = get_string('backupsection', 'backup', $sectionname);
  92             $PAGE->navbar->add($sectionname);
  93         } else {
  94             $heading = get_string('backupsection', 'backup', $section->section);
  95             $PAGE->navbar->add(get_string('section').' '.$section->section);
  96         }
  97         break;
  98     case backup::TYPE_1ACTIVITY :
  99         $activitycontext = context_module::instance($cm->id);
 100         require_capability('moodle/backup:backupactivity', $activitycontext);
 101         $contextid = $activitycontext->id;
 102         $heading = get_string('backupactivity', 'backup', $cm->name);
 103         break;
 104     default :
 105         print_error('unknownbackuptype');
 106 }
 107
 108 $PAGE->set_title($heading);
 109 $PAGE->set_heading($heading);
 110 $PAGE->activityheader->disable();
 111
 112 if (empty($cancel)) {
 113     // Do not print the header if user cancelled the process, as we are going to redirect the user.
 114     echo $OUTPUT->header();
 115 }
 116
 117 // Only let user perform a backup if we aren't in async mode, or if we are
 118 // and there are no pending backups for this item for this user.
 119 if (!async_helper::is_async_pending($id, 'course', 'backup')) {
 120
 121     // The mix of business logic and display elements below makes me sad.
 122     // This needs to refactored into the renderer and seperated out.
 123
 124     if (!($bc = backup_ui::load_controller($backupid))) {
 125         $bc = new backup_controller($type, $id, backup::FORMAT_MOODLE,
 126                 backup::INTERACTIVE_YES, $backupmode, $USER->id, backup::RELEASESESSION_YES);
 127         // The backup id did not relate to a valid controller so we made a new controller.
 128         // Now we need to reset the backup id to match the new controller.
 129         $backupid = $bc->get_backupid();
 130     }
 131
 132     // Prepare a progress bar which can display optionally during long-running
 133     // operations while setting up the UI.
 134     $slowprogress = new \core\progress\display_if_slow(get_string('preparingui', 'backup'));
 135     $renderer = $PAGE->get_renderer('core', 'backup');
 136     $backup = new backup_ui($bc);
 137
 138     if ($backup->get_stage() == backup_ui::STAGE_SCHEMA && !$previous) {
 139         // After schema stage, we are probably going to get to the confirmation stage,
 140         // The confirmation stage has 2 sets of progress, so this is needed to prevent
 141         // it showing 2 progress bars.
 142         $twobars = true;
 143         $slowprogress->start_progress('', 2);
 144     } else {
 145         $twobars = false;
 146     }
 147     $backup->get_controller()->set_progress($slowprogress);
 148     $backup->process();
 149
 150     if ($backup->enforce_changed_dependencies()) {
 151         debugging('Your settings have been altered due to unmet dependencies', DEBUG_DEVELOPER);
 152     }
 153
 154     $loghtml = '';
 155     if ($backup->get_stage() == backup_ui::STAGE_FINAL) {
 156
 157         // Before we perform the backup check settings to see if user
 158         // or setting defaults are set to exclude files from the backup.
 159         if ($backup->get_setting_value('files') == 0) {
 160             $renderer->set_samesite_notification();
 161         }
 162
 163         if ($backupmode != backup::MODE_ASYNC) {
 164             // Synchronous backup handling.
 165
 166             // Display an extra backup step bar so that we can show the 'processing' step first.
 167             echo html_writer::start_div('', array('id' => 'executionprogress'));
 168             echo $renderer->progress_bar($backup->get_progress_bar());
 169             $backup->get_controller()->set_progress(new \core\progress\display());
 170
 171             // Prepare logger and add to end of chain.
 172             $logger = new core_backup_html_logger($CFG->debugdeveloper ? backup::LOG_DEBUG : backup::LOG_INFO);
 173             $backup->get_controller()->add_logger($logger);
 174
 175             // Carry out actual backup.
 176             $backup->execute();
 177
 178             // Backup controller gets saved/loaded so the logger object changes and we
 179             // have to retrieve it.
 180             $logger = $backup->get_controller()->get_logger();
 181             while (!is_a($logger, 'core_backup_html_logger')) {
 182                 $logger = $logger->get_next();
 183             }
 184
 185             // Get HTML from logger.
 186             if ($CFG->debugdisplay) {
 187                 $loghtml = $logger->get_html();
 188             }
 189
 190             // Hide the progress display and first backup step bar (the 'finished' step will show next).
 191             echo html_writer::end_div();
 192             echo html_writer::script('document.getElementById("executionprogress").style.display = "none";');
 193
 194         } else {
 195             // Async backup handling.
 196             $backup->get_controller()->finish_ui();
 197
 198             echo html_writer::start_div('', array('id' => 'executionprogress'));
 199             echo $renderer->progress_bar($backup->get_progress_bar());
 200             echo html_writer::end_div();
 201
 202             // Create adhoc task for backup.
 203             $asynctask = new \core\task\asynchronous_backup_task();
 204             $asynctask->set_blocking(false);
 205             $asynctask->set_custom_data(array('backupid' => $backupid));
 206             $asynctask->set_userid($USER->id);
 207             \core\task\manager::queue_adhoc_task($asynctask);
 208
 209             // Add ajax progress bar and initiate ajax via a template.
 210             $restoreurl = new moodle_url('/backup/restorefile.php', array('contextid' => $contextid));
 211             $progresssetup = array(
 212                     'backupid' => $backupid,
 213                     'contextid' => $contextid,
 214                     'courseurl' => $courseurl->out(),
 215                     'restoreurl' => $restoreurl->out(),
 216                     'headingident' => 'backup'
 217             );
 218
 219             echo $renderer->render_from_template('core/async_backup_status', $progresssetup);
 220         }
 221
 222     } else {
 223         $backup->save_controller();
 224     }
 225
 226     if ($backup->get_stage() != backup_ui::STAGE_FINAL) {
 227
 228         // Displaying UI can require progress reporting, so do it here before outputting
 229         // the backup stage bar (as part of the existing progress bar, if required).
 230         $ui = $backup->display($renderer);
 231         if ($twobars) {
 232             $slowprogress->end_progress();
 233         }
 234
 235         echo $renderer->progress_bar($backup->get_progress_bar());
 236         echo $ui;
 237
 238         // Display log data if there was any.
 239         if ($loghtml != '' && $backupmode != backup::MODE_ASYNC) {
 240             echo $renderer->log_display($loghtml);
 241         }
 242     }
 243
 244     $backup->destroy();
 245     unset($backup);
 246
 247 } else { // User has a pending async operation.
 248     echo $OUTPUT->notification(get_string('pendingasyncerror', 'backup'), 'error');
 249     echo $OUTPUT->container(get_string('pendingasyncdetail', 'backup'));
 250     echo $OUTPUT->continue_button($courseurl);
 251 }
 252
 253 echo $OUTPUT->footer();