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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   * This file contains the version information for the comments feedback plugin
  19   *
  20   * @package assignfeedback_editpdf
  21   * @copyright  2012 Davo Smith
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  /**
  28   * Serves assignment feedback and other files.
  29   *
  30   * @param mixed $course course or id of the course
  31   * @param mixed $cm course module or id of the course module
  32   * @param context $context
  33   * @param string $filearea
  34   * @param array $args
  35   * @param bool $forcedownload
  36   * @return bool false if file not found, does not return if found - just send the file
  37   */
  38  function assignfeedback_editpdf_pluginfile($course,
  39                                             $cm,
  40                                             context $context,
  41                                             $filearea,
  42                                             $args,
  43                                             $forcedownload) {
  44      global $USER, $DB, $CFG;
  45  
  46      if ($context->contextlevel == CONTEXT_MODULE) {
  47  
  48          require_login($course, false, $cm);
  49          $itemid = (int)array_shift($args);
  50  
  51          if (!$assign = $DB->get_record('assign', array('id'=>$cm->instance))) {
  52              return false;
  53          }
  54  
  55          $record = $DB->get_record('assign_grades', array('id'=>$itemid), 'userid,assignment', MUST_EXIST);
  56          $userid = $record->userid;
  57          if ($assign->id != $record->assignment) {
  58              return false;
  59          }
  60  
  61          // Check is users feedback or has grading permission.
  62          if ($USER->id != $userid and !has_capability('mod/assign:grade', $context)) {
  63              return false;
  64          }
  65  
  66          $relativepath = implode('/', $args);
  67  
  68          $fullpath = "/{$context->id}/assignfeedback_editpdf/$filearea/$itemid/$relativepath";
  69  
  70          $fs = get_file_storage();
  71          if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
  72              return false;
  73          }
  74          // Download MUST be forced - security!
  75          send_stored_file($file, 0, 0, true);// Check if we want to retrieve the stamps.
  76      }
  77  
  78  }