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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   * X-Sendfile support
  19   *
  20   * @package   core_files
  21   * @copyright 2012 Petr Skoda {@link http://skodak.org}
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  //NOTE: do not verify MOODLE_INTERNAL here, this is used from themes too
  26  
  27  /**
  28   * Serve file using X-Sendfile header, this needs special server module
  29   * or configuration. Please make sure that all headers are already sent
  30   * and the all access control checks passed.
  31   *
  32   * @param string $filepath
  33   * @return bool success
  34   */
  35  function xsendfile($filepath) {
  36      global $CFG;
  37  
  38      if (empty($CFG->xsendfile)) {
  39          return false;
  40      }
  41  
  42      if (!file_exists($filepath)) {
  43          return false;
  44      }
  45  
  46      if (headers_sent()) {
  47          return false;
  48      }
  49  
  50      $filepath = realpath($filepath);
  51  
  52      $aliased = false;
  53      if (!empty($CFG->xsendfilealiases) and is_array($CFG->xsendfilealiases)) {
  54          foreach ($CFG->xsendfilealiases as $alias=>$dir) {
  55              $dir = realpath($dir);
  56              if ($dir === false) {
  57                  continue;
  58              }
  59              if (substr($dir, -1) !== DIRECTORY_SEPARATOR) {
  60                  // add trailing dir separator
  61                  $dir .= DIRECTORY_SEPARATOR;
  62              }
  63              if (strpos($filepath, $dir) === 0) {
  64                  $filepath = $alias.substr($filepath, strlen($dir));
  65                  $aliased = true;
  66                  break;
  67              }
  68          }
  69      }
  70  
  71      if ($CFG->xsendfile === 'X-LIGHTTPD-send-file') {
  72          // http://redmine.lighttpd.net/projects/lighttpd/wiki/X-LIGHTTPD-send-file says 1.4 it does not support byteserving
  73          header('Accept-Ranges: none');
  74  
  75      } else if ($CFG->xsendfile === 'X-Accel-Redirect') {
  76          // http://wiki.nginx.org/XSendfile
  77          // Nginx requires paths relative to aliases, you need to specify them in config.php
  78          if (!$aliased) {
  79              return false;
  80          }
  81      }
  82  
  83      header("$CFG->xsendfile: $filepath");
  84  
  85      return true;
  86  }