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Differences Between: [Versions 310 and 403] [Versions 39 and 403]

   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   * Course handler for custom fields
  19   *
  20   * @package   core_course
  21   * @copyright 2018 David Matamoros <davidmc@moodle.com>
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  namespace core_course\customfield;
  26  
  27  defined('MOODLE_INTERNAL') || die;
  28  
  29  use core_customfield\api;
  30  use core_customfield\field_controller;
  31  
  32  /**
  33   * Course handler for custom fields
  34   *
  35   * @package core_course
  36   * @copyright 2018 David Matamoros <davidmc@moodle.com>
  37   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  38   */
  39  class course_handler extends \core_customfield\handler {
  40  
  41      /**
  42       * @var course_handler
  43       */
  44      static protected $singleton;
  45  
  46      /**
  47       * @var \context
  48       */
  49      protected $parentcontext;
  50  
  51      /** @var int Field is displayed in the course listing, visible to everybody */
  52      const VISIBLETOALL = 2;
  53      /** @var int Field is displayed in the course listing but only for teachers */
  54      const VISIBLETOTEACHERS = 1;
  55      /** @var int Field is not displayed in the course listing */
  56      const NOTVISIBLE = 0;
  57  
  58      /**
  59       * Returns a singleton
  60       *
  61       * @param int $itemid
  62       * @return \core_course\customfield\course_handler
  63       */
  64      public static function create(int $itemid = 0) : \core_customfield\handler {
  65          if (static::$singleton === null) {
  66              self::$singleton = new static(0);
  67          }
  68          return self::$singleton;
  69      }
  70  
  71      /**
  72       * Run reset code after unit tests to reset the singleton usage.
  73       */
  74      public static function reset_caches(): void {
  75          if (!PHPUNIT_TEST) {
  76              throw new \coding_exception('This feature is only intended for use in unit tests');
  77          }
  78  
  79          static::$singleton = null;
  80      }
  81  
  82      /**
  83       * The current user can configure custom fields on this component.
  84       *
  85       * @return bool true if the current can configure custom fields, false otherwise
  86       */
  87      public function can_configure() : bool {
  88          return has_capability('moodle/course:configurecustomfields', $this->get_configuration_context());
  89      }
  90  
  91      /**
  92       * The current user can edit custom fields on the given course.
  93       *
  94       * @param field_controller $field
  95       * @param int $instanceid id of the course to test edit permission
  96       * @return bool true if the current can edit custom fields, false otherwise
  97       */
  98      public function can_edit(field_controller $field, int $instanceid = 0) : bool {
  99          if ($instanceid) {
 100              $context = $this->get_instance_context($instanceid);
 101              return (!$field->get_configdata_property('locked') ||
 102                      has_capability('moodle/course:changelockedcustomfields', $context));
 103          } else {
 104              $context = $this->get_parent_context();
 105              if ($context->contextlevel == CONTEXT_SYSTEM) {
 106                  return (!$field->get_configdata_property('locked') ||
 107                      has_capability('moodle/course:changelockedcustomfields', $context));
 108              } else {
 109                  return (!$field->get_configdata_property('locked') ||
 110                      guess_if_creator_will_have_course_capability('moodle/course:changelockedcustomfields', $context));
 111              }
 112          }
 113      }
 114  
 115      /**
 116       * The current user can view custom fields on the given course.
 117       *
 118       * @param field_controller $field
 119       * @param int $instanceid id of the course to test edit permission
 120       * @return bool true if the current can edit custom fields, false otherwise
 121       */
 122      public function can_view(field_controller $field, int $instanceid) : bool {
 123          $visibility = $field->get_configdata_property('visibility');
 124          if ($visibility == self::NOTVISIBLE) {
 125              return false;
 126          } else if ($visibility == self::VISIBLETOTEACHERS) {
 127              return has_capability('moodle/course:update', $this->get_instance_context($instanceid));
 128          } else {
 129              return true;
 130          }
 131      }
 132  
 133      /**
 134       * Sets parent context for the course
 135       *
 136       * This may be needed when course is being created, there is no course context but we need to check capabilities
 137       *
 138       * @param \context $context
 139       */
 140      public function set_parent_context(\context $context) {
 141          $this->parentcontext = $context;
 142      }
 143  
 144      /**
 145       * Returns the parent context for the course
 146       *
 147       * @return \context
 148       */
 149      protected function get_parent_context() : \context {
 150          global $PAGE;
 151          if ($this->parentcontext) {
 152              return $this->parentcontext;
 153          } else if ($PAGE->context && $PAGE->context instanceof \context_coursecat) {
 154              return $PAGE->context;
 155          }
 156          return \context_system::instance();
 157      }
 158  
 159      /**
 160       * Context that should be used for new categories created by this handler
 161       *
 162       * @return \context the context for configuration
 163       */
 164      public function get_configuration_context() : \context {
 165          return \context_system::instance();
 166      }
 167  
 168      /**
 169       * URL for configuration of the fields on this handler.
 170       *
 171       * @return \moodle_url The URL to configure custom fields for this component
 172       */
 173      public function get_configuration_url() : \moodle_url {
 174          return new \moodle_url('/course/customfield.php');
 175      }
 176  
 177      /**
 178       * Returns the context for the data associated with the given instanceid.
 179       *
 180       * @param int $instanceid id of the record to get the context for
 181       * @return \context the context for the given record
 182       */
 183      public function get_instance_context(int $instanceid = 0) : \context {
 184          if ($instanceid > 0) {
 185              return \context_course::instance($instanceid);
 186          } else {
 187              return \context_system::instance();
 188          }
 189      }
 190  
 191      /**
 192       * Allows to add custom controls to the field configuration form that will be saved in configdata
 193       *
 194       * @param \MoodleQuickForm $mform
 195       */
 196      public function config_form_definition(\MoodleQuickForm $mform) {
 197          $mform->addElement('header', 'course_handler_header', get_string('customfieldsettings', 'core_course'));
 198          $mform->setExpanded('course_handler_header', true);
 199  
 200          // If field is locked.
 201          $mform->addElement('selectyesno', 'configdata[locked]', get_string('customfield_islocked', 'core_course'));
 202          $mform->addHelpButton('configdata[locked]', 'customfield_islocked', 'core_course');
 203  
 204          // Field data visibility.
 205          $visibilityoptions = [self::VISIBLETOALL => get_string('customfield_visibletoall', 'core_course'),
 206              self::VISIBLETOTEACHERS => get_string('customfield_visibletoteachers', 'core_course'),
 207              self::NOTVISIBLE => get_string('customfield_notvisible', 'core_course')];
 208          $mform->addElement('select', 'configdata[visibility]', get_string('customfield_visibility', 'core_course'),
 209              $visibilityoptions);
 210          $mform->addHelpButton('configdata[visibility]', 'customfield_visibility', 'core_course');
 211      }
 212  
 213      /**
 214       * Creates or updates custom field data.
 215       *
 216       * @param \restore_task $task
 217       * @param array $data
 218       */
 219      public function restore_instance_data_from_backup(\restore_task $task, array $data) {
 220          $courseid = $task->get_courseid();
 221          $context = $this->get_instance_context($courseid);
 222          $editablefields = $this->get_editable_fields($courseid);
 223          $records = api::get_instance_fields_data($editablefields, $courseid);
 224          $target = $task->get_target();
 225          $override = ($target != \backup::TARGET_CURRENT_ADDING && $target != \backup::TARGET_EXISTING_ADDING);
 226  
 227          foreach ($records as $d) {
 228              $field = $d->get_field();
 229              if ($field->get('shortname') === $data['shortname'] && $field->get('type') === $data['type']) {
 230                  if (!$d->get('id') || $override) {
 231                      $d->set($d->datafield(), $data['value']);
 232                      $d->set('value', $data['value']);
 233                      $d->set('valueformat', $data['valueformat']);
 234                      $d->set('contextid', $context->id);
 235                      $d->save();
 236                  }
 237                  return;
 238              }
 239          }
 240      }
 241  }