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   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  /**
  19   * Utility class for browsing of curse category files.
  20   *
  21   * @package    core_files
  22   * @copyright  2008 Petr Skoda (http://skodak.org)
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  /**
  29   * Represents a course category context in the tree navigated by {@link file_browser}.
  30   *
  31   * @package    core_files
  32   * @copyright  2008 Petr Skoda (http://skodak.org)
  33   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  34   */
  35  class file_info_context_coursecat extends file_info {
  36      /** @var stdClass Category object */
  37      protected $category;
  38  
  39      /**
  40       * Constructor
  41       *
  42       * @param file_browser $browser file browser instance
  43       * @param stdClass $context context object
  44       * @param stdClass $category category object
  45       */
  46      public function __construct($browser, $context, $category) {
  47          parent::__construct($browser, $context);
  48          $this->category = $category;
  49      }
  50  
  51      /**
  52       * Return information about this specific context level
  53       *
  54       * @param string $component component
  55       * @param string $filearea file area
  56       * @param int $itemid item ID
  57       * @param string $filepath file path
  58       * @param string $filename file name
  59       * @return fileinfo|null
  60       */
  61      public function get_file_info($component, $filearea, $itemid, $filepath, $filename) {
  62          global $DB;
  63  
  64          if (!$this->category->visible and !has_capability('moodle/category:viewhiddencategories', $this->context)) {
  65              if (empty($component)) {
  66                  // we can not list the category contents, so try parent, or top system
  67                  if ($this->category->parent and $pc = $DB->get_record('course_categories', array('id'=>$this->category->parent))) {
  68                      $parent = context_coursecat::instance($pc->id, IGNORE_MISSING);
  69                      return $this->browser->get_file_info($parent);
  70                  } else {
  71                      return $this->browser->get_file_info();
  72                  }
  73              }
  74              return null;
  75          }
  76  
  77          if (empty($component)) {
  78              return $this;
  79          }
  80  
  81          $methodname = "get_area_{$component}_{$filearea}";
  82          if (method_exists($this, $methodname)) {
  83              return $this->$methodname($itemid, $filepath, $filename);
  84          }
  85  
  86          return null;
  87      }
  88  
  89      /**
  90       * Return a file from course category description area
  91       *
  92       * @param int $itemid item ID
  93       * @param string $filepath file path
  94       * @param string $filename file name
  95       * @return fileinfo|null
  96       */
  97      protected function get_area_coursecat_description($itemid, $filepath, $filename) {
  98          global $CFG;
  99  
 100          if (!has_capability('moodle/course:update', $this->context)) {
 101              return null;
 102          }
 103  
 104          if (is_null($itemid)) {
 105              return $this;
 106          }
 107  
 108          $fs = get_file_storage();
 109  
 110          $filepath = is_null($filepath) ? '/' : $filepath;
 111          $filename = is_null($filename) ? '.' : $filename;
 112          $urlbase = $CFG->wwwroot.'/pluginfile.php';
 113          if (!$storedfile = $fs->get_file($this->context->id, 'coursecat', 'description', 0, $filepath, $filename)) {
 114              if ($filepath === '/' and $filename === '.') {
 115                  $storedfile = new virtual_root_file($this->context->id, 'coursecat', 'description', 0);
 116              } else {
 117                  // not found
 118                  return null;
 119              }
 120          }
 121  
 122          return new file_info_stored($this->browser, $this->context, $storedfile, $urlbase, get_string('areacategoryintro', 'repository'), false, true, true, false);
 123      }
 124  
 125      /**
 126       * Returns localised visible name.
 127       *
 128       * @return string
 129       */
 130      public function get_visible_name() {
 131          return format_string($this->category->name, true, array('context'=>$this->context));
 132      }
 133  
 134      /**
 135       * Whether or not new files or directories can be added
 136       *
 137       * @return bool
 138       */
 139      public function is_writable() {
 140          return false;
 141      }
 142  
 143      /**
 144       * Whether or not this is a directory
 145       *
 146       * @return bool
 147       */
 148      public function is_directory() {
 149          return true;
 150      }
 151  
 152      /**
 153       * Returns list of children.
 154       *
 155       * @return array of file_info instances
 156       */
 157      public function get_children() {
 158          global $DB;
 159  
 160          $children = array();
 161  
 162          if ($child = $this->get_area_coursecat_description(0, '/', '.')) {
 163              $children[] = $child;
 164          }
 165  
 166          $course_cats = $DB->get_records('course_categories', array('parent'=>$this->category->id), 'sortorder', 'id,visible');
 167          foreach ($course_cats as $category) {
 168              $context = context_coursecat::instance($category->id);
 169              if (!$category->visible and !has_capability('moodle/category:viewhiddencategories', $context)) {
 170                  continue;
 171              }
 172              if ($child = $this->browser->get_file_info($context)) {
 173                  $children[] = $child;
 174              }
 175          }
 176  
 177          $courses = $DB->get_records('course', array('category'=>$this->category->id), 'sortorder', 'id,visible');
 178          foreach ($courses as $course) {
 179              $context = context_course::instance($course->id);
 180              if (!$course->visible and !has_capability('moodle/course:viewhiddencourses', $context)) {
 181                  continue;
 182              }
 183              if ($child = $this->browser->get_file_info($context)) {
 184                  $children[] = $child;
 185              }
 186          }
 187  
 188          return $children;
 189      }
 190  
 191      /**
 192       * Returns the number of children which are either files matching the specified extensions
 193       * or folders containing at least one such file.
 194       *
 195       * @param string|array $extensions, for example '*' or array('.gif','.jpg')
 196       * @param int $limit stop counting after at least $limit non-empty children are found
 197       * @return int
 198       */
 199      public function count_non_empty_children($extensions = '*', $limit = 1) {
 200          global $DB;
 201          $cnt = 0;
 202          if (($child = $this->get_area_coursecat_description(0, '/', '.'))
 203                  && $child->count_non_empty_children($extensions) && (++$cnt) >= $limit) {
 204              return $cnt;
 205          }
 206  
 207          $rs = $DB->get_recordset_sql('SELECT ctx.id AS contextid, c.visible
 208                  FROM {context} ctx, {course} c
 209                  WHERE ctx.instanceid = c.id
 210                  AND ctx.contextlevel = :courselevel
 211                  AND c.category = :categoryid
 212                  ORDER BY c.visible DESC', // retrieve visible courses first
 213                  array('categoryid' => $this->category->id, 'courselevel' => CONTEXT_COURSE));
 214          foreach ($rs as $record) {
 215              $context = context::instance_by_id($record->contextid);
 216              if (!$record->visible and !has_capability('moodle/course:viewhiddencourses', $context)) {
 217                  continue;
 218              }
 219              if (($child = $this->browser->get_file_info($context))
 220                      && $child->count_non_empty_children($extensions) && (++$cnt) >= $limit) {
 221                  break;
 222              }
 223          }
 224          $rs->close();
 225          if ($cnt >= $limit) {
 226              return $cnt;
 227          }
 228  
 229          $rs = $DB->get_recordset_sql('SELECT ctx.id AS contextid, cat.visible
 230                  FROM {context} ctx, {course_categories} cat
 231                  WHERE ctx.instanceid = cat.id
 232                  AND ctx.contextlevel = :catlevel
 233                  AND cat.parent = :categoryid
 234                  ORDER BY cat.visible DESC', // retrieve visible categories first
 235                  array('categoryid' => $this->category->id, 'catlevel' => CONTEXT_COURSECAT));
 236          foreach ($rs as $record) {
 237              $context = context::instance_by_id($record->contextid);
 238              if (!$record->visible and !has_capability('moodle/category:viewhiddencategories', $context)) {
 239                  continue;
 240              }
 241              if (($child = $this->browser->get_file_info($context))
 242                      && $child->count_non_empty_children($extensions) && (++$cnt) >= $limit) {
 243                  break;
 244              }
 245          }
 246          $rs->close();
 247  
 248          return $cnt;
 249      }
 250  
 251      /**
 252       * Returns parent file_info instance
 253       *
 254       * @return file_info|null fileinfo instance or null for root directory
 255       */
 256      public function get_parent() {
 257          $parent = $this->context->get_parent_context();
 258          return $this->browser->get_file_info($parent);
 259      }
 260  }