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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   * Form for editing HTML block instances.
  19   *
  20   * @copyright 2010 Petr Skoda (http://skodak.org)
  21   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  22   * @package   block_html
  23   * @category  files
  24   * @param stdClass $course course object
  25   * @param stdClass $birecord_or_cm block instance record
  26   * @param stdClass $context context object
  27   * @param string $filearea file area
  28   * @param array $args extra arguments
  29   * @param bool $forcedownload whether or not force download
  30   * @param array $options additional options affecting the file serving
  31   * @return bool
  32   * @todo MDL-36050 improve capability check on stick blocks, so we can check user capability before sending images.
  33   */
  34  function block_html_pluginfile($course, $birecord_or_cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
  35      global $DB, $CFG, $USER;
  36  
  37      if ($context->contextlevel != CONTEXT_BLOCK) {
  38          send_file_not_found();
  39      }
  40  
  41      // If block is in course context, then check if user has capability to access course.
  42      if ($context->get_course_context(false)) {
  43          require_course_login($course);
  44      } else if ($CFG->forcelogin) {
  45          require_login();
  46      } else {
  47          // Get parent context and see if user have proper permission.
  48          $parentcontext = $context->get_parent_context();
  49          if ($parentcontext->contextlevel === CONTEXT_COURSECAT) {
  50              // Check if category is visible and user can view this category.
  51              $category = $DB->get_record('course_categories', array('id' => $parentcontext->instanceid), '*', MUST_EXIST);
  52              if (!$category->visible) {
  53                  require_capability('moodle/category:viewhiddencategories', $parentcontext);
  54              }
  55          } else if ($parentcontext->contextlevel === CONTEXT_USER && $parentcontext->instanceid != $USER->id) {
  56              // The block is in the context of a user, it is only visible to the user who it belongs to.
  57              send_file_not_found();
  58          }
  59          // At this point there is no way to check SYSTEM context, so ignoring it.
  60      }
  61  
  62      if ($filearea !== 'content') {
  63          send_file_not_found();
  64      }
  65  
  66      $fs = get_file_storage();
  67  
  68      $filename = array_pop($args);
  69      $filepath = $args ? '/'.implode('/', $args).'/' : '/';
  70  
  71      if (!$file = $fs->get_file($context->id, 'block_html', 'content', 0, $filepath, $filename) or $file->is_directory()) {
  72          send_file_not_found();
  73      }
  74  
  75      if ($parentcontext = context::instance_by_id($birecord_or_cm->parentcontextid, IGNORE_MISSING)) {
  76          if ($parentcontext->contextlevel == CONTEXT_USER) {
  77              // force download on all personal pages including /my/
  78              //because we do not have reliable way to find out from where this is used
  79              $forcedownload = true;
  80          }
  81      } else {
  82          // weird, there should be parent context, better force dowload then
  83          $forcedownload = true;
  84      }
  85  
  86      // NOTE: it woudl be nice to have file revisions here, for now rely on standard file lifetime,
  87      //       do not lower it because the files are dispalyed very often.
  88      \core\session\manager::write_close();
  89      send_stored_file($file, null, 0, $forcedownload, $options);
  90  }
  91  
  92  /**
  93   * Perform global search replace such as when migrating site to new URL.
  94   * @param  $search
  95   * @param  $replace
  96   * @return void
  97   */
  98  function block_html_global_db_replace($search, $replace) {
  99      global $DB;
 100  
 101      $instances = $DB->get_recordset('block_instances', array('blockname' => 'html'));
 102      foreach ($instances as $instance) {
 103          // TODO: intentionally hardcoded until MDL-26800 is fixed
 104          $config = unserialize(base64_decode($instance->configdata));
 105          if (isset($config->text) and is_string($config->text)) {
 106              $config->text = str_replace($search, $replace, $config->text);
 107              $DB->set_field('block_instances', 'configdata', base64_encode(serialize($config)), array('id' => $instance->id));
 108          }
 109      }
 110      $instances->close();
 111  }