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See Release Notes

  • Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
  • Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
  • PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.

Differences Between: [Versions 310 and 311] [Versions 310 and 400] [Versions 310 and 401] [Versions 310 and 402] [Versions 310 and 403] [Versions 39 and 310]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * restore user interface stages
  19   *
  20   * This file contains the classes required to manage the stages that make up the
  21   * restore user interface.
  22   * These will be primarily operated a {@link restore_ui} instance.
  23   *
  24   * @package   core_backup
  25   * @copyright 2010 Sam Hemelryk
  26   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  27   */
  28  
  29  /**
  30   * Abstract stage class
  31   *
  32   * This class should be extended by all restore stages (a requirement of many restore ui functions).
  33   * Each stage must then define two abstract methods
  34   *  - process : To process the stage
  35   *  - initialise_stage_form : To get a restore_moodleform instance for the stage
  36   *
  37   * @package   core_backup
  38   * @copyright 2010 Sam Hemelryk
  39   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  40   */
  41  abstract class restore_ui_stage extends base_ui_stage {
  42      /**
  43       * Constructor
  44       * @param restore_ui $ui
  45       * @param array $params
  46       */
  47      public function __construct(restore_ui $ui, array $params = null) {
  48          $this->ui = $ui;
  49          $this->params = $params;
  50      }
  51      /**
  52       * The restore id from the restore controller
  53       * @return string
  54       */
  55      final public function get_restoreid() {
  56          return $this->get_uniqueid();
  57      }
  58  
  59      /**
  60       * This is an independent stage
  61       * @return int
  62       */
  63      final public function is_independent() {
  64          return false;
  65      }
  66  
  67      /**
  68       * No sub stages for this stage
  69       * @return false
  70       */
  71      public function has_sub_stages() {
  72          return false;
  73      }
  74  
  75      /**
  76       * The name of this stage
  77       * @return string
  78       */
  79      final public function get_name() {
  80          return get_string('restorestage'.$this->stage, 'backup');
  81      }
  82  
  83      /**
  84       * Returns true if this is the settings stage
  85       * @return bool
  86       */
  87      final public function is_first_stage() {
  88          return $this->stage == restore_ui::STAGE_SETTINGS;
  89      }
  90  }
  91  
  92  /**
  93   * Abstract class used to represent a restore stage that is indenependent.
  94   *
  95   * An independent stage is a judged to be so because it doesn't require, and has
  96   * no use for the restore controller.
  97   *
  98   * @package   core_backup
  99   * @copyright 2010 Sam Hemelryk
 100   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 101   */
 102  abstract class restore_ui_independent_stage {
 103      /**
 104       * @var \core\progress\base Optional progress reporter
 105       */
 106      private $progressreporter;
 107  
 108      /**
 109       * Constructs the restore stage.
 110       * @param int $contextid
 111       */
 112      abstract public function __construct($contextid);
 113  
 114      /**
 115       * Processes the current restore stage.
 116       * @return mixed
 117       */
 118      abstract public function process();
 119  
 120      /**
 121       * Displays this restore stage.
 122       * @param core_backup_renderer $renderer
 123       * @return mixed
 124       */
 125      abstract public function display(core_backup_renderer $renderer);
 126  
 127      /**
 128       * Returns the current restore stage.
 129       * @return int
 130       */
 131      abstract public function get_stage();
 132  
 133      /**
 134       * Gets the progress reporter object in use for this restore UI stage.
 135       *
 136       * IMPORTANT: This progress reporter is used only for UI progress that is
 137       * outside the restore controller. The restore controller has its own
 138       * progress reporter which is used for progress during the main restore.
 139       * Use the restore controller's progress reporter to report progress during
 140       * a restore operation, not this one.
 141       *
 142       * This extra reporter is necessary because on some restore UI screens,
 143       * there are long-running tasks even though there is no restore controller
 144       * in use. There is a similar function in restore_ui. but that class is not
 145       * used on some stages.
 146       *
 147       * @return \core\progress\none
 148       */
 149      public function get_progress_reporter() {
 150          if (!$this->progressreporter) {
 151              $this->progressreporter = new \core\progress\none();
 152          }
 153          return $this->progressreporter;
 154      }
 155  
 156      /**
 157       * Sets the progress reporter that will be returned by get_progress_reporter.
 158       *
 159       * @param \core\progress\base $progressreporter Progress reporter
 160       */
 161      public function set_progress_reporter(\core\progress\base $progressreporter) {
 162          $this->progressreporter = $progressreporter;
 163      }
 164  
 165      /**
 166       * Gets an array of progress bar items that can be displayed through the restore renderer.
 167       * @return array Array of items for the progress bar
 168       */
 169      public function get_progress_bar() {
 170          global $PAGE;
 171          $stage = restore_ui::STAGE_COMPLETE;
 172          $currentstage = $this->get_stage();
 173          $items = array();
 174          while ($stage > 0) {
 175              $classes = array('backup_stage');
 176              if (floor($stage / 2) == $currentstage) {
 177                  $classes[] = 'backup_stage_next';
 178              } else if ($stage == $currentstage) {
 179                  $classes[] = 'backup_stage_current';
 180              } else if ($stage < $currentstage) {
 181                  $classes[] = 'backup_stage_complete';
 182              }
 183              $item = array('text' => strlen(decbin($stage)).'. '.get_string('restorestage'.$stage, 'backup'), 'class' => join(' ', $classes));
 184              if ($stage < $currentstage && $currentstage < restore_ui::STAGE_COMPLETE) {
 185                  // By default you can't go back to independent stages, if that changes in the future uncomment the next line.
 186                  // $item['link'] = new moodle_url($PAGE->url, array('restore' => $this->get_restoreid(), 'stage' => $stage));
 187              }
 188              array_unshift($items, $item);
 189              $stage = floor($stage / 2);
 190          }
 191          return $items;
 192      }
 193  
 194      /**
 195       * Returns the restore stage name.
 196       * @return string
 197       */
 198      abstract public function get_stage_name();
 199  
 200      /**
 201       * Obviously true
 202       * @return true
 203       */
 204      final public function is_independent() {
 205          return true;
 206      }
 207  
 208      /**
 209       * Handles the destruction of this object.
 210       */
 211      public function destroy() {
 212          // Nothing to destroy here!.
 213      }
 214  }
 215  
 216  /**
 217   * The confirmation stage.
 218   *
 219   * This is the first stage, it is independent.
 220   *
 221   * @package   core_backup
 222   * @copyright 2010 Sam Hemelryk
 223   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 224   */
 225  class restore_ui_stage_confirm extends restore_ui_independent_stage implements file_progress {
 226  
 227      /**
 228       * The context ID.
 229       * @var int
 230       */
 231      protected $contextid;
 232  
 233      /**
 234       * The file name.
 235       * @var string
 236       */
 237      protected $filename = null;
 238  
 239      /**
 240       * The file path.
 241       * @var string
 242       */
 243      protected $filepath = null;
 244  
 245      /**
 246       * @var string Content hash of archive file to restore (if specified by hash)
 247       */
 248      protected $contenthash = null;
 249  
 250      /**
 251       * @var string Pathname hash of stored_file object to restore
 252       */
 253      protected $pathnamehash = null;
 254  
 255      /**
 256       * @var array
 257       */
 258      protected $details;
 259  
 260      /**
 261       * @var bool True if we have started reporting progress
 262       */
 263      protected $startedprogress = false;
 264  
 265      /**
 266       * Constructor
 267       * @param int $contextid
 268       * @throws coding_exception
 269       */
 270      public function __construct($contextid) {
 271          $this->contextid = $contextid;
 272          $this->filename = optional_param('filename', null, PARAM_FILE);
 273          if ($this->filename === null) {
 274              // Identify file object by its pathname hash.
 275              $this->pathnamehash = required_param('pathnamehash', PARAM_ALPHANUM);
 276  
 277              // The file content hash is also passed for security; users
 278              // cannot guess the content hash (unless they know the file contents),
 279              // so this guarantees that either the system generated this link or
 280              // else the user has access to the restore archive anyhow.
 281              $this->contenthash = required_param('contenthash', PARAM_ALPHANUM);
 282          }
 283      }
 284  
 285      /**
 286       * Processes this restore stage
 287       * @return bool
 288       * @throws restore_ui_exception
 289       */
 290      public function process() {
 291          $backuptempdir = make_backup_temp_directory('');
 292          if ($this->filename) {
 293              $archivepath = $backuptempdir . '/' . $this->filename;
 294              if (!file_exists($archivepath)) {
 295                  throw new restore_ui_exception('invalidrestorefile');
 296              }
 297              $outcome = $this->extract_file_to_dir($archivepath);
 298              if ($outcome) {
 299                  fulldelete($archivepath);
 300              }
 301          } else {
 302              $fs = get_file_storage();
 303              $storedfile = $fs->get_file_by_hash($this->pathnamehash);
 304              if (!$storedfile || $storedfile->get_contenthash() !== $this->contenthash) {
 305                  throw new restore_ui_exception('invalidrestorefile');
 306              }
 307              $outcome = $this->extract_file_to_dir($storedfile);
 308          }
 309          return $outcome;
 310      }
 311  
 312      /**
 313       * Extracts the file.
 314       *
 315       * @param string|stored_file $source Archive file to extract
 316       * @return bool
 317       */
 318      protected function extract_file_to_dir($source) {
 319          global $USER;
 320  
 321          $this->filepath = restore_controller::get_tempdir_name($this->contextid, $USER->id);
 322          $backuptempdir = make_backup_temp_directory('', false);
 323  
 324          $fb = get_file_packer('application/vnd.moodle.backup');
 325          $result = $fb->extract_to_pathname($source,
 326                  $backuptempdir . '/' . $this->filepath . '/', null, $this);
 327  
 328          // If any progress happened, end it.
 329          if ($this->startedprogress) {
 330              $this->get_progress_reporter()->end_progress();
 331          }
 332          return $result;
 333      }
 334  
 335      /**
 336       * Implementation for file_progress interface to display unzip progress.
 337       *
 338       * @param int $progress Current progress
 339       * @param int $max Max value
 340       */
 341      public function progress($progress = file_progress::INDETERMINATE, $max = file_progress::INDETERMINATE) {
 342          $reporter = $this->get_progress_reporter();
 343  
 344          // Start tracking progress if necessary.
 345          if (!$this->startedprogress) {
 346              $reporter->start_progress('extract_file_to_dir',
 347                      ($max == file_progress::INDETERMINATE) ? \core\progress\base::INDETERMINATE : $max);
 348              $this->startedprogress = true;
 349          }
 350  
 351          // Pass progress through to whatever handles it.
 352          $reporter->progress(
 353                  ($progress == file_progress::INDETERMINATE) ? \core\progress\base::INDETERMINATE : $progress);
 354      }
 355  
 356      /**
 357       * Renders the confirmation stage screen
 358       *
 359       * @param core_backup_renderer $renderer renderer instance to use
 360       * @return string HTML code
 361       */
 362      public function display(core_backup_renderer $renderer) {
 363  
 364          $prevstageurl = new moodle_url('/backup/restorefile.php', array('contextid' => $this->contextid));
 365          $nextstageurl = new moodle_url('/backup/restore.php', array(
 366              'contextid' => $this->contextid,
 367              'filepath'  => $this->filepath,
 368              'stage'     => restore_ui::STAGE_DESTINATION));
 369  
 370          $format = backup_general_helper::detect_backup_format($this->filepath);
 371  
 372          if ($format === backup::FORMAT_UNKNOWN) {
 373              // Unknown format - we can't do anything here.
 374              return $renderer->backup_details_unknown($prevstageurl);
 375  
 376          } else if ($format !== backup::FORMAT_MOODLE) {
 377              // Non-standard format to be converted.
 378              $details = array('format' => $format, 'type' => backup::TYPE_1COURSE); // todo type to be returned by a converter
 379              return $renderer->backup_details_nonstandard($nextstageurl, $details);
 380  
 381          } else {
 382              // Standard MBZ backup, let us get information from it and display.
 383              $this->details = backup_general_helper::get_backup_information($this->filepath);
 384              return $renderer->backup_details($this->details, $nextstageurl);
 385          }
 386      }
 387  
 388      /**
 389       * The restore stage name.
 390       * @return string
 391       * @throws coding_exception
 392       */
 393      public function get_stage_name() {
 394          return get_string('restorestage'.restore_ui::STAGE_CONFIRM, 'backup');
 395      }
 396  
 397      /**
 398       * The restore stage this class is for.
 399       * @return int
 400       */
 401      public function get_stage() {
 402          return restore_ui::STAGE_CONFIRM;
 403      }
 404  }
 405  
 406  /**
 407   * This is the destination stage.
 408   *
 409   * This stage is the second stage and is also independent
 410   *
 411   * @package   core_backup
 412   * @copyright 2010 Sam Hemelryk
 413   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 414   */
 415  class restore_ui_stage_destination extends restore_ui_independent_stage {
 416  
 417      /**
 418       * The context ID.
 419       * @var int
 420       */
 421      protected $contextid;
 422  
 423      /**
 424       * The backup file path.
 425       * @var mixed|null
 426       */
 427      protected $filepath = null;
 428  
 429      /**
 430       * The course ID.
 431       * @var null
 432       */
 433      protected $courseid = null;
 434  
 435      /**
 436       * The restore target. One of backup::TARGET_NEW
 437       * @var int
 438       */
 439      protected $target = backup::TARGET_NEW_COURSE;
 440  
 441      /**
 442       * The course search component.
 443       * @var null|restore_course_search
 444       */
 445      protected $coursesearch = null;
 446  
 447      /**
 448       * The category search component.
 449       * @var null|restore_category_search
 450       */
 451      protected $categorysearch = null;
 452  
 453      /**
 454       * Constructs the destination stage.
 455       * @param int $contextid
 456       * @throws coding_exception
 457       */
 458      public function __construct($contextid) {
 459          global $PAGE;
 460          $this->contextid = $contextid;
 461          $this->filepath = required_param('filepath', PARAM_ALPHANUM);
 462          $url = new moodle_url($PAGE->url, array(
 463              'filepath' => $this->filepath,
 464              'contextid' => $this->contextid,
 465              'stage' => restore_ui::STAGE_DESTINATION));
 466          $this->coursesearch = new restore_course_search(array('url' => $url), context::instance_by_id($contextid)->instanceid);
 467          $this->categorysearch = new restore_category_search(array('url' => $url));
 468      }
 469  
 470      /**
 471       * Processes the destination stage.
 472       * @return bool
 473       * @throws coding_exception
 474       * @throws restore_ui_exception
 475       */
 476      public function process() {
 477          global $DB;
 478          $filepathdir = make_backup_temp_directory($this->filepath, false);
 479          if (!file_exists($filepathdir) || !is_dir($filepathdir)) {
 480              throw new restore_ui_exception('invalidrestorepath');
 481          }
 482          if (optional_param('searchcourses', false, PARAM_BOOL)) {
 483              return false;
 484          }
 485          $this->target = optional_param('target', backup::TARGET_NEW_COURSE, PARAM_INT);
 486          $targetid = optional_param('targetid', null, PARAM_INT);
 487          if (!is_null($this->target) && !is_null($targetid) && confirm_sesskey()) {
 488              if ($this->target == backup::TARGET_NEW_COURSE) {
 489                  list($fullname, $shortname) = restore_dbops::calculate_course_names(0, get_string('restoringcourse', 'backup'), get_string('restoringcourseshortname', 'backup'));
 490                  $this->courseid = restore_dbops::create_new_course($fullname, $shortname, $targetid);
 491              } else {
 492                  $this->courseid = $targetid;
 493              }
 494              return ($DB->record_exists('course', array('id' => $this->courseid)));
 495          }
 496          return false;
 497      }
 498  
 499      /**
 500       * Renders the destination stage screen
 501       *
 502       * @param core_backup_renderer $renderer renderer instance to use
 503       * @return string HTML code
 504       */
 505      public function display(core_backup_renderer $renderer) {
 506  
 507          $format = backup_general_helper::detect_backup_format($this->filepath);
 508  
 509          if ($format === backup::FORMAT_MOODLE) {
 510              // Standard Moodle 2 format, let use get the type of the backup.
 511              $details = backup_general_helper::get_backup_information($this->filepath);
 512              if ($details->type === backup::TYPE_1COURSE) {
 513                  $wholecourse = true;
 514              } else {
 515                  $wholecourse = false;
 516              }
 517  
 518          } else {
 519              // Non-standard format to be converted. We assume it contains the
 520              // whole course for now. However, in the future there might be a callback
 521              // to the installed converters.
 522              $wholecourse = true;
 523          }
 524  
 525          $nextstageurl = new moodle_url('/backup/restore.php', array(
 526              'contextid' => $this->contextid,
 527              'filepath'  => $this->filepath,
 528              'stage'     => restore_ui::STAGE_SETTINGS));
 529          $context = context::instance_by_id($this->contextid);
 530  
 531          if ($context->contextlevel == CONTEXT_COURSE and has_capability('moodle/restore:restorecourse', $context)) {
 532              $currentcourse = $context->instanceid;
 533          } else {
 534              $currentcourse = false;
 535          }
 536  
 537          return $renderer->course_selector($nextstageurl, $wholecourse, $this->categorysearch, $this->coursesearch, $currentcourse);
 538      }
 539  
 540      /**
 541       * Returns the stage name.
 542       * @return string
 543       * @throws coding_exception
 544       */
 545      public function get_stage_name() {
 546          return get_string('restorestage'.restore_ui::STAGE_DESTINATION, 'backup');
 547      }
 548  
 549      /**
 550       * Returns the backup file path
 551       * @return mixed|null
 552       */
 553      public function get_filepath() {
 554          return $this->filepath;
 555      }
 556  
 557      /**
 558       * Returns the course id.
 559       * @return null
 560       */
 561      public function get_course_id() {
 562          return $this->courseid;
 563      }
 564  
 565      /**
 566       * Returns the current restore stage
 567       * @return int
 568       */
 569      public function get_stage() {
 570          return restore_ui::STAGE_DESTINATION;
 571      }
 572  
 573      /**
 574       * Returns the target for this restore.
 575       * One of backup::TARGET_*
 576       * @return int
 577       */
 578      public function get_target() {
 579          return $this->target;
 580      }
 581  }
 582  
 583  /**
 584   * This stage is the settings stage.
 585   *
 586   * This stage is the third stage, it is dependent on a restore controller and
 587   * is the first stage as such.
 588   *
 589   * @package   core_backup
 590   * @copyright 2010 Sam Hemelryk
 591   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 592   */
 593  class restore_ui_stage_settings extends restore_ui_stage {
 594      /**
 595       * Initial restore stage constructor
 596       * @param restore_ui $ui
 597       * @param array $params
 598       */
 599      public function __construct(restore_ui $ui, array $params = null) {
 600          $this->stage = restore_ui::STAGE_SETTINGS;
 601          parent::__construct($ui, $params);
 602      }
 603  
 604      /**
 605       * Process the settings stage.
 606       *
 607       * @param base_moodleform $form
 608       * @return bool|int
 609       */
 610      public function process(base_moodleform $form = null) {
 611          $form = $this->initialise_stage_form();
 612  
 613          if ($form->is_cancelled()) {
 614              $this->ui->cancel_process();
 615          }
 616  
 617          $data = $form->get_data();
 618          if ($data && confirm_sesskey()) {
 619              $tasks = $this->ui->get_tasks();
 620              $changes = 0;
 621              foreach ($tasks as &$task) {
 622                  // We are only interesting in the backup root task for this stage.
 623                  if ($task instanceof restore_root_task || $task instanceof restore_course_task) {
 624                      // Get all settings into a var so we can iterate by reference.
 625                      $settings = $task->get_settings();
 626                      foreach ($settings as &$setting) {
 627                          $name = $setting->get_ui_name();
 628                          if (isset($data->$name) &&  $data->$name != $setting->get_value()) {
 629                              $setting->set_value($data->$name);
 630                              $changes++;
 631                          } else if (!isset($data->$name) && $setting->get_ui_type() == backup_setting::UI_HTML_CHECKBOX && $setting->get_value()) {
 632                              $setting->set_value(0);
 633                              $changes++;
 634                          }
 635                      }
 636                  }
 637              }
 638              // Return the number of changes the user made.
 639              return $changes;
 640          } else {
 641              return false;
 642          }
 643      }
 644  
 645      /**
 646       * Initialise the stage form.
 647       *
 648       * @return backup_moodleform|base_moodleform|restore_settings_form
 649       * @throws coding_exception
 650       */
 651      protected function initialise_stage_form() {
 652          global $PAGE;
 653          if ($this->stageform === null) {
 654              $form = new restore_settings_form($this, $PAGE->url);
 655              // Store as a variable so we can iterate by reference.
 656              $tasks = $this->ui->get_tasks();
 657              $headingprinted = false;
 658              // Iterate all tasks by reference.
 659              foreach ($tasks as &$task) {
 660                  // For the initial stage we are only interested in the root settings.
 661                  if ($task instanceof restore_root_task) {
 662                      if (!$headingprinted) {
 663                          $form->add_heading('rootsettings', get_string('restorerootsettings', 'backup'));
 664                          $headingprinted = true;
 665                      }
 666                      $settings = $task->get_settings();
 667                      // First add all settings except the filename setting.
 668                      foreach ($settings as &$setting) {
 669                          if ($setting->get_name() == 'filename') {
 670                              continue;
 671                          }
 672                          $form->add_setting($setting, $task);
 673                      }
 674                      // Then add all dependencies.
 675                      foreach ($settings as &$setting) {
 676                          if ($setting->get_name() == 'filename') {
 677                              continue;
 678                          }
 679                          $form->add_dependencies($setting);
 680                      }
 681                  }
 682              }
 683              $this->stageform = $form;
 684          }
 685          // Return the form.
 686          return $this->stageform;
 687      }
 688  }
 689  
 690  /**
 691   * Schema stage of backup process
 692   *
 693   * During the schema stage the user is required to set the settings that relate
 694   * to the area that they are backing up as well as its children.
 695   *
 696   * @package   core_backup
 697   * @copyright 2010 Sam Hemelryk
 698   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 699   */
 700  class restore_ui_stage_schema extends restore_ui_stage {
 701      /**
 702       * @var int Maximum number of settings to add to form at once
 703       */
 704      const MAX_SETTINGS_BATCH = 1000;
 705  
 706      /**
 707       * Schema stage constructor
 708       * @param restore_ui $ui
 709       * @param array $params
 710       */
 711      public function __construct(restore_ui $ui, array $params = null) {
 712          $this->stage = restore_ui::STAGE_SCHEMA;
 713          parent::__construct($ui, $params);
 714      }
 715  
 716      /**
 717       * Processes the schema stage
 718       *
 719       * @param base_moodleform $form
 720       * @return int The number of changes the user made
 721       */
 722      public function process(base_moodleform $form = null) {
 723          $form = $this->initialise_stage_form();
 724          // Check it wasn't cancelled.
 725          if ($form->is_cancelled()) {
 726              $this->ui->cancel_process();
 727          }
 728  
 729          // Check it has been submit.
 730          $data = $form->get_data();
 731          if ($data && confirm_sesskey()) {
 732              // Get the tasks into a var so we can iterate by reference.
 733              $tasks = $this->ui->get_tasks();
 734              $changes = 0;
 735              // Iterate all tasks by reference.
 736              foreach ($tasks as &$task) {
 737                  // We are only interested in schema settings.
 738                  if (!($task instanceof restore_root_task)) {
 739                      // Store as a variable so we can iterate by reference.
 740                      $settings = $task->get_settings();
 741                      // Iterate by reference.
 742                      foreach ($settings as &$setting) {
 743                          $name = $setting->get_ui_name();
 744                          if (isset($data->$name) &&  $data->$name != $setting->get_value()) {
 745                              $setting->set_value($data->$name);
 746                              $changes++;
 747                          } else if (!isset($data->$name) && $setting->get_ui_type() == backup_setting::UI_HTML_CHECKBOX && $setting->get_value()) {
 748                              $setting->set_value(0);
 749                              $changes++;
 750                          }
 751                      }
 752                  }
 753              }
 754              // Return the number of changes the user made.
 755              return $changes;
 756          } else {
 757              return false;
 758          }
 759      }
 760  
 761      /**
 762       * Creates the backup_schema_form instance for this stage
 763       *
 764       * @return backup_schema_form
 765       */
 766      protected function initialise_stage_form() {
 767          global $PAGE;
 768          if ($this->stageform === null) {
 769              $form = new restore_schema_form($this, $PAGE->url);
 770              $tasks = $this->ui->get_tasks();
 771              $courseheading = false;
 772  
 773              // Track progress through each stage.
 774              $progress = $this->ui->get_progress_reporter();
 775              $progress->start_progress('Initialise schema stage form', 3);
 776  
 777              $progress->start_progress('', count($tasks));
 778              $done = 1;
 779              $allsettings = array();
 780              foreach ($tasks as $task) {
 781                  if (!($task instanceof restore_root_task)) {
 782                      if (!$courseheading) {
 783                          // If we haven't already display a course heading to group nicely.
 784                          $form->add_heading('coursesettings', get_string('coursesettings', 'backup'));
 785                          $courseheading = true;
 786                      }
 787                      // Put each setting into an array of settings to add. Adding
 788                      // a setting individually is a very slow operation, so we add.
 789                      // them all in a batch later on.
 790                      foreach ($task->get_settings() as $setting) {
 791                          $allsettings[] = array($setting, $task);
 792                      }
 793                  } else if ($this->ui->enforce_changed_dependencies()) {
 794                      // Only show these settings if dependencies changed them.
 795                      // Add a root settings heading to group nicely.
 796                      $form->add_heading('rootsettings', get_string('rootsettings', 'backup'));
 797                      // Iterate all settings and add them to the form as a fixed
 798                      // setting. We only want schema settings to be editable.
 799                      foreach ($task->get_settings() as $setting) {
 800                          if ($setting->get_name() != 'filename') {
 801                              $form->add_fixed_setting($setting, $task);
 802                          }
 803                      }
 804                  }
 805                  // Update progress.
 806                  $progress->progress($done++);
 807              }
 808              $progress->end_progress();
 809  
 810              // Add settings for tasks in batches of up to 1000. Adding settings
 811              // in larger batches improves performance, but if it takes too long,
 812              // we won't be able to update the progress bar so the backup might.
 813              // time out. 1000 is chosen to balance this.
 814              $numsettings = count($allsettings);
 815              $progress->start_progress('', ceil($numsettings / self::MAX_SETTINGS_BATCH));
 816              $start = 0;
 817              $done = 1;
 818              while ($start < $numsettings) {
 819                  $length = min(self::MAX_SETTINGS_BATCH, $numsettings - $start);
 820                  $form->add_settings(array_slice($allsettings, $start, $length));
 821                  $start += $length;
 822                  $progress->progress($done++);
 823              }
 824              $progress->end_progress();
 825  
 826              // Add the dependencies for all the settings.
 827              $progress->start_progress('', count($allsettings));
 828              $done = 1;
 829              foreach ($allsettings as $settingtask) {
 830                  $form->add_dependencies($settingtask[0]);
 831                  $progress->progress($done++);
 832              }
 833              $progress->end_progress();
 834  
 835              $progress->end_progress();
 836              $this->stageform = $form;
 837          }
 838          return $this->stageform;
 839      }
 840  }
 841  
 842  /**
 843   * Confirmation stage
 844   *
 845   * On this stage the user reviews the setting for the backup and can change the filename
 846   * of the file that will be generated.
 847   *
 848   * @package   core_backup
 849   * @copyright 2010 Sam Hemelryk
 850   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 851   */
 852  class restore_ui_stage_review extends restore_ui_stage {
 853  
 854      /**
 855       * Constructs the stage
 856       * @param restore_ui $ui
 857       * @param array $params
 858       */
 859      public function __construct($ui, array $params = null) {
 860          $this->stage = restore_ui::STAGE_REVIEW;
 861          parent::__construct($ui, $params);
 862      }
 863  
 864      /**
 865       * Processes the confirmation stage
 866       *
 867       * @param base_moodleform $form
 868       * @return int The number of changes the user made
 869       */
 870      public function process(base_moodleform $form = null) {
 871          $form = $this->initialise_stage_form();
 872          // Check it hasn't been cancelled.
 873          if ($form->is_cancelled()) {
 874              $this->ui->cancel_process();
 875          }
 876  
 877          $data = $form->get_data();
 878          if ($data && confirm_sesskey()) {
 879              return 0;
 880          } else {
 881              return false;
 882          }
 883      }
 884      /**
 885       * Creates the backup_confirmation_form instance this stage requires
 886       *
 887       * @return backup_confirmation_form
 888       */
 889      protected function initialise_stage_form() {
 890          global $PAGE;
 891          if ($this->stageform === null) {
 892              // Get the form.
 893              $form = new restore_review_form($this, $PAGE->url);
 894              $content = '';
 895              $courseheading = false;
 896  
 897              $progress = $this->ui->get_progress_reporter();
 898              $tasks = $this->ui->get_tasks();
 899              $progress->start_progress('initialise_stage_form', count($tasks));
 900              $done = 1;
 901              foreach ($tasks as $task) {
 902                  if ($task instanceof restore_root_task) {
 903                      // If its a backup root add a root settings heading to group nicely.
 904                      $form->add_heading('rootsettings', get_string('restorerootsettings', 'backup'));
 905                  } else if (!$courseheading) {
 906                      // We haven't already add a course heading.
 907                      $form->add_heading('coursesettings', get_string('coursesettings', 'backup'));
 908                      $courseheading = true;
 909                  }
 910                  // Iterate all settings, doesnt need to happen by reference.
 911                  foreach ($task->get_settings() as $setting) {
 912                      $form->add_fixed_setting($setting, $task);
 913                  }
 914                  // Update progress.
 915                  $progress->progress($done++);
 916              }
 917              $progress->end_progress();
 918              $this->stageform = $form;
 919          }
 920          return $this->stageform;
 921      }
 922  }
 923  
 924  /**
 925   * Final stage of backup
 926   *
 927   * This stage is special in that it is does not make use of a form. The reason for
 928   * this is the order of procession of backup at this stage.
 929   * The processesion is:
 930   * 1. The final stage will be intialise.
 931   * 2. The confirmation stage will be processed.
 932   * 3. The backup will be executed
 933   * 4. The complete stage will be loaded by execution
 934   * 5. The complete stage will be displayed
 935   *
 936   * This highlights that we neither need a form nor a display method for this stage
 937   * we simply need to process.
 938   *
 939   * @package   core_backup
 940   * @copyright 2010 Sam Hemelryk
 941   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 942   */
 943  class restore_ui_stage_process extends restore_ui_stage {
 944  
 945      /**
 946       * There is no substage required.
 947       */
 948      const SUBSTAGE_NONE = 0;
 949  
 950      /**
 951       * The prechecks substage is required/the current substage.
 952       */
 953      const SUBSTAGE_PRECHECKS = 2;
 954  
 955      /**
 956       * The current substage.
 957       * @var int
 958       */
 959      protected $substage = 0;
 960  
 961      /**
 962       * Constructs the final stage
 963       * @param base_ui $ui
 964       * @param array $params
 965       */
 966      public function __construct(base_ui $ui, array $params = null) {
 967          $this->stage = restore_ui::STAGE_PROCESS;
 968          parent::__construct($ui, $params);
 969      }
 970      /**
 971       * Processes the final stage.
 972       *
 973       * In this case it checks to see if there is a sub stage that we need to display
 974       * before execution, if there is we gear up to display the subpage, otherwise
 975       * we return true which will lead to execution of the restore and the loading
 976       * of the completed stage.
 977       *
 978       * @param base_moodleform $form
 979       */
 980      public function process(base_moodleform $form = null) {
 981          if (optional_param('cancel', false, PARAM_BOOL)) {
 982              redirect(new moodle_url('/course/view.php', array('id' => $this->get_ui()->get_controller()->get_courseid())));
 983          }
 984  
 985          // First decide whether a substage is needed.
 986          $rc = $this->ui->get_controller();
 987          if ($rc->get_status() == backup::STATUS_SETTING_UI) {
 988              $rc->finish_ui();
 989          }
 990          if ($rc->get_status() == backup::STATUS_NEED_PRECHECK) {
 991              if (!$rc->precheck_executed()) {
 992                  $rc->execute_precheck(true);
 993              }
 994              $results = $rc->get_precheck_results();
 995              if (!empty($results)) {
 996                  $this->substage = self::SUBSTAGE_PRECHECKS;
 997              }
 998          }
 999  
1000          $substage = optional_param('substage', null, PARAM_INT);
1001          if (empty($this->substage) && !empty($substage)) {
1002              $this->substage = $substage;
1003              // Now check whether that substage has already been submit.
1004              if ($this->substage == self::SUBSTAGE_PRECHECKS && optional_param('sesskey', null, PARAM_RAW) == sesskey()) {
1005                  $info = $rc->get_info();
1006                  if (!empty($info->role_mappings->mappings)) {
1007                      foreach ($info->role_mappings->mappings as $key => &$mapping) {
1008                          $mapping->targetroleid = optional_param('mapping'.$key, $mapping->targetroleid, PARAM_INT);
1009                      }
1010                      $info->role_mappings->modified = true;
1011                  }
1012                  // We've processed the substage now setting it back to none so we
1013                  // can move to the next stage.
1014                  $this->substage = self::SUBSTAGE_NONE;
1015              }
1016          }
1017  
1018          return empty($this->substage);
1019      }
1020      /**
1021       * should NEVER be called... throws an exception
1022       */
1023      protected function initialise_stage_form() {
1024          throw new backup_ui_exception('backup_ui_must_execute_first');
1025      }
1026  
1027      /**
1028       * Renders the process stage screen
1029       *
1030       * @throws restore_ui_exception
1031       * @param core_backup_renderer $renderer renderer instance to use
1032       * @return string HTML code
1033       */
1034      public function display(core_backup_renderer $renderer) {
1035          global $PAGE;
1036  
1037          $html = '';
1038          $haserrors = false;
1039          $url = new moodle_url($PAGE->url, array(
1040              'restore'   => $this->get_uniqueid(),
1041              'stage'     => restore_ui::STAGE_PROCESS,
1042              'substage'  => $this->substage,
1043              'sesskey'   => sesskey()));
1044          $html .= html_writer::start_tag('form', array(
1045              'action'    => $url->out_omit_querystring(),
1046              'class'     => 'backup-restore',
1047              'enctype'   => 'application/x-www-form-urlencoded', // Enforce compatibility with our max_input_vars hack.
1048              'method'    => 'post'));
1049          foreach ($url->params() as $name => $value) {
1050              $html .= html_writer::empty_tag('input', array(
1051                  'type'  => 'hidden',
1052                  'name'  => $name,
1053                  'value' => $value));
1054          }
1055          switch ($this->substage) {
1056              case self::SUBSTAGE_PRECHECKS :
1057                  $results = $this->ui->get_controller()->get_precheck_results();
1058                  $info = $this->ui->get_controller()->get_info();
1059                  $haserrors = (!empty($results['errors']));
1060                  $html .= $renderer->precheck_notices($results);
1061                  if (!empty($info->role_mappings->mappings)) {
1062                      $context = context_course::instance($this->ui->get_controller()->get_courseid());
1063                      $assignableroles = get_assignable_roles($context, ROLENAME_ALIAS, false);
1064  
1065                      // Get current role mappings.
1066                      $currentroles = role_fix_names(get_all_roles(), $context);
1067                      // Get backup role mappings.
1068                      $rolemappings = $info->role_mappings->mappings;
1069  
1070                      array_map(function($rolemapping) use ($currentroles) {
1071                          foreach ($currentroles as $role) {
1072                              // Find matching archetype to determine the backup's shortname for label display.
1073                              if ($rolemapping->archetype == $role->archetype) {
1074                                  $rolemapping->name = $rolemapping->shortname;
1075                                  break;
1076                              }
1077                          }
1078                          if ($rolemapping->name == null) {
1079                              $rolemapping->name = get_string('undefinedrolemapping', 'backup', $rolemapping->archetype);
1080                          }
1081                      }, $rolemappings);
1082  
1083                      $html .= $renderer->role_mappings($rolemappings, $assignableroles);
1084                  }
1085                  break;
1086              default:
1087                  throw new restore_ui_exception('backup_ui_must_execute_first');
1088          }
1089          $html .= $renderer->substage_buttons($haserrors);
1090          $html .= html_writer::end_tag('form');
1091  
1092          return $html;
1093      }
1094  
1095      /**
1096       * Returns true if this stage can have sub-stages.
1097       * @return bool|false
1098       */
1099      public function has_sub_stages() {
1100          return true;
1101      }
1102  }
1103  
1104  /**
1105   * This is the completed stage.
1106   *
1107   * Once this is displayed there is nothing more to do.
1108   *
1109   * @package   core_backup
1110   * @copyright 2010 Sam Hemelryk
1111   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1112   */
1113  class restore_ui_stage_complete extends restore_ui_stage_process {
1114  
1115      /**
1116       * The results of the backup execution
1117       * @var array
1118       */
1119      protected $results;
1120  
1121      /**
1122       * Constructs the complete backup stage
1123       * @param restore_ui $ui
1124       * @param array $params
1125       * @param array $results
1126       */
1127      public function __construct(restore_ui $ui, array $params = null, array $results = null) {
1128          $this->results = $results;
1129          parent::__construct($ui, $params);
1130          $this->stage = restore_ui::STAGE_COMPLETE;
1131      }
1132  
1133      /**
1134       * Displays the completed backup stage.
1135       *
1136       * Currently this just envolves redirecting to the file browser with an
1137       * appropriate message.
1138       *
1139       * @param core_backup_renderer $renderer
1140       * @return string HTML code to echo
1141       */
1142      public function display(core_backup_renderer $renderer) {
1143  
1144          $html  = '';
1145          if (!empty($this->results['file_aliases_restore_failures'])) {
1146              $html .= $renderer->box_start('generalbox filealiasesfailures');
1147              $html .= $renderer->heading_with_help(get_string('filealiasesrestorefailures', 'core_backup'),
1148                  'filealiasesrestorefailures', 'core_backup');
1149              $html .= $renderer->container(get_string('filealiasesrestorefailuresinfo', 'core_backup'));
1150              $html .= $renderer->container_start('aliaseslist');
1151              $html .= html_writer::start_tag('ul');
1152              foreach ($this->results['file_aliases_restore_failures'] as $alias) {
1153                  $html .= html_writer::tag('li', s($alias));
1154              }
1155              $html .= html_writer::end_tag('ul');
1156              $html .= $renderer->container_end();
1157              $html .= $renderer->box_end();
1158          }
1159          $html .= $renderer->box_start();
1160          if (array_key_exists('file_missing_in_backup', $this->results)) {
1161              $html .= $renderer->notification(get_string('restorefileweremissing', 'backup'), 'notifyproblem');
1162          }
1163          $html .= $renderer->notification(get_string('restoreexecutionsuccess', 'backup'), 'notifysuccess');
1164          $html .= $renderer->continue_button(new moodle_url('/course/view.php', array(
1165              'id' => $this->get_ui()->get_controller()->get_courseid())), 'get');
1166          $html .= $renderer->box_end();
1167  
1168          return $html;
1169      }
1170  }