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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   * Defines backup_course_task
  20   *
  21   * @package     core_backup
  22   * @subpackage  moodle2
  23   * @category    backup
  24   * @copyright   2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
  25   * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26   */
  27  
  28  /**
  29   * course task that provides all the properties and common steps to be performed
  30   * when one course is being backup
  31   *
  32   * TODO: Finish phpdocs
  33   */
  34  class backup_course_task extends backup_task {
  35  
  36      protected $courseid;
  37      protected $contextid;
  38  
  39      /**
  40       * Constructor - instantiates one object of this class
  41       */
  42      public function __construct($name, $courseid, $plan = null) {
  43  
  44          $this->courseid   = $courseid;
  45          $this->contextid  = context_course::instance($this->courseid)->id;
  46  
  47          parent::__construct($name, $plan);
  48      }
  49  
  50      public function get_contextid() {
  51          return $this->contextid;
  52      }
  53  
  54      /**
  55       * Course tasks have their own directory to write files
  56       */
  57      public function get_taskbasepath() {
  58  
  59          return $this->get_basepath() . '/course';
  60      }
  61  
  62      /**
  63       * Create all the steps that will be part of this task
  64       */
  65      public function build() {
  66  
  67          // Add some extra settings that related processors are going to need
  68          $this->add_setting(new backup_activity_generic_setting(backup::VAR_COURSEID, base_setting::IS_INTEGER, $this->get_courseid()));
  69          $this->add_setting(new backup_activity_generic_setting(backup::VAR_CONTEXTID, base_setting::IS_INTEGER, $this->contextid));
  70  
  71          // Create the course directory
  72          $this->add_step(new create_taskbasepath_directory('create_course_directory'));
  73  
  74          // Create the course.xml file with course & category information
  75          // annotating some bits, tags and module restrictions
  76          $this->add_step(new backup_course_structure_step('course_info', 'course.xml'));
  77  
  78          // Generate the enrolment file (conditionally, prevent it in any IMPORT/HUB operation)
  79          if ($this->plan->get_mode() != backup::MODE_IMPORT && $this->plan->get_mode() != backup::MODE_HUB) {
  80              $this->add_step(new backup_enrolments_structure_step('course_enrolments', 'enrolments.xml'));
  81          }
  82  
  83          // Annotate all the groups and groupings belonging to the course
  84          $this->add_step(new backup_annotate_course_groups_and_groupings('annotate_course_groups'));
  85  
  86          // Annotate the groups used in already annotated groupings (note this may be
  87          // unnecessary now that we are annotating all the course groups and groupings in the
  88          // step above. But we keep it working in case we decide, someday, to introduce one
  89          // setting to transform the step above into an optional one. This is here to support
  90          // course->defaultgroupingid
  91          $this->add_step(new backup_annotate_groups_from_groupings('annotate_groups_from_groupings'));
  92  
  93          // Annotate the question_categories belonging to the course context (conditionally).
  94          if ($this->get_setting_value('questionbank')) {
  95              $this->add_step(new backup_calculate_question_categories('course_question_categories'));
  96          }
  97  
  98          // Generate the roles file (optionally role assignments and always role overrides)
  99          $this->add_step(new backup_roles_structure_step('course_roles', 'roles.xml'));
 100  
 101          // Generate the filter file (conditionally)
 102          if ($this->get_setting_value('filters')) {
 103              $this->add_step(new backup_filters_structure_step('course_filters', 'filters.xml'));
 104          }
 105  
 106          // Generate the comments file (conditionally)
 107          if ($this->get_setting_value('comments')) {
 108              $this->add_step(new backup_comments_structure_step('course_comments', 'comments.xml'));
 109          }
 110  
 111          // Generate the calender events file (conditionally)
 112          if ($this->get_setting_value('calendarevents')) {
 113              $this->add_step(new backup_calendarevents_structure_step('course_calendar', 'calendar.xml'));
 114          }
 115  
 116          // Generate the logs file (conditionally)
 117          if ($this->get_setting_value('logs')) {
 118              $this->add_step(new backup_course_logs_structure_step('course_logs', 'logs.xml'));
 119          }
 120  
 121          // Generate the inforef file (must be after ALL steps gathering annotations of ANY type)
 122          $this->add_step(new backup_inforef_structure_step('course', 'inforef.xml'));
 123  
 124          // Migrate the already exported inforef entries to final ones
 125          $this->add_step(new move_inforef_annotations_to_final('migrate_inforef'));
 126  
 127          // At the end, mark it as built
 128          $this->built = true;
 129      }
 130  
 131      /**
 132       * Code the transformations to perform in the course in
 133       * order to get transportable (encoded) links
 134       * @param string $content content in which to encode links.
 135       * @return string content with links encoded.
 136       */
 137      static public function encode_content_links($content) {
 138  
 139          // Link to the course main page (it also covers "&topic=xx" and "&week=xx"
 140          // because they don't become transformed (section number) in backup/restore.
 141          $content = self::encode_links_helper($content, 'COURSEVIEWBYID',       '/course/view.php?id=');
 142  
 143          // A few other key course links.
 144          $content = self::encode_links_helper($content, 'GRADEINDEXBYID',       '/grade/index.php?id=');
 145          $content = self::encode_links_helper($content, 'GRADEREPORTINDEXBYID', '/grade/report/index.php?id=');
 146          $content = self::encode_links_helper($content, 'BADGESVIEWBYID',       '/badges/view.php?type=2&id=');
 147          $content = self::encode_links_helper($content, 'USERINDEXVIEWBYID',    '/user/index.php?id=');
 148  
 149          return $content;
 150      }
 151  
 152      /**
 153       * Helper method, used by encode_content_links.
 154       * @param string $content content in which to encode links.
 155       * @param unknown_type $name the name of this type of encoded link.
 156       * @param unknown_type $path the path that identifies this type of link, up
 157       *      to the ?paramname= bit.
 158       * @return string content with one type of link encoded.
 159       */
 160      static private function encode_links_helper($content, $name, $path) {
 161          global $CFG;
 162          $base = preg_quote($CFG->wwwroot . $path, '/');
 163          return preg_replace('/(' . $base . ')([0-9]+)/', '$@' . $name . '*$2@$', $content);
 164      }
 165  
 166  // Protected API starts here
 167  
 168      /**
 169       * Define the common setting that any backup section will have
 170       */
 171      protected function define_settings() {
 172  
 173          // Nothing to add, sections doesn't have common settings (for now)
 174  
 175      }
 176  }