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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 is responsible for serving of yui images
  19   *
  20   * @package   core
  21   * @copyright 2009 Petr Skoda (skodak)  {@link http://skodak.org}
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  
  26  // disable moodle specific debug messages and any errors in output,
  27  // comment out when debugging or better look into error log!
  28  define('NO_DEBUG_DISPLAY', true);
  29  
  30  // we need just the values from config.php and minlib.php
  31  define('ABORT_AFTER_CONFIG', true);
  32  require('../config.php'); // this stops immediately at the beginning of lib/setup.php
  33  
  34  if ($slashargument = min_get_slash_argument()) {
  35      $path = ltrim($slashargument, '/');
  36  } else {
  37      $path = min_optional_param('file', '', 'SAFEPATH');
  38  }
  39  
  40  $etag = sha1($path);
  41  $parts = explode('/', $path);
  42  $version = array_shift($parts);
  43  if ($version === 'm') {
  44      $version = 'moodle';
  45  }
  46  if ($version == 'moodle' && count($parts) >= 3) {
  47      $frankenstyle = array_shift($parts);
  48      $module = array_shift($parts);
  49      $image = array_pop($parts);
  50      $subdir = join('/', $parts);
  51      $dir = core_component::get_component_directory($frankenstyle);
  52  
  53      // For shifted YUI modules, we need the YUI module name in frankenstyle format.
  54      $frankenstylemodulename = join('-', array($version, $frankenstyle, $module));
  55  
  56      // By default, try and use the /yui/build directory.
  57      $imagepath = $dir . '/yui/build/' . $frankenstylemodulename . '/assets/skins/sam/' . $image;
  58  
  59      // If the shifted versions don't exist, fall back to the non-shifted file.
  60      if (!file_exists($imagepath) or !is_file($imagepath)) {
  61          $imagepath = $dir . '/yui/' . $module . '/assets/skins/sam/' . $image;
  62      }
  63  } else if ($version == 'gallery' && count($parts) >= 3) {
  64      list($revision, $module, , , , $image) = $parts;
  65      $imagepath = "$CFG->dirroot/lib/yuilib/gallery/$module/assets/skins/sam/$image";
  66  } else {
  67      // Allow support for revisions on YUI between official releases.
  68      // We can just discard the subrevision since it is only used to invalidate the browser cache.
  69      $yuipatchedversion = explode('_', $version);
  70      $yuiversion = $yuipatchedversion[0];
  71      if (count($parts) == 1 && ($yuiversion == $CFG->yui3version || $yuiversion == $CFG->yui2version)) {
  72          list($image) = $parts;
  73          if ($yuiversion == $CFG->yui3version) {
  74              $imagepath = "$CFG->dirroot/lib/yuilib/$CFG->yui3version/assets/skins/sam/$image";
  75          } else  {
  76              $imagepath = "$CFG->dirroot/lib/yuilib/2in3/$CFG->yui2version/build/assets/skins/sam/$image";
  77          }
  78      } else {
  79          yui_image_not_found();
  80      }
  81  }
  82  
  83  if (!file_exists($imagepath)) {
  84      yui_image_not_found();
  85  }
  86  
  87  $pathinfo = pathinfo($imagepath);
  88  $imagename = $pathinfo['filename'].'.'.$pathinfo['extension'];
  89  
  90  switch($pathinfo['extension']) {
  91      case 'gif'  : $mimetype = 'image/gif'; break;
  92      case 'png'  : $mimetype = 'image/png'; break;
  93      case 'jpg'  : $mimetype = 'image/jpeg'; break;
  94      case 'jpeg' : $mimetype = 'image/jpeg'; break;
  95      case 'ico'  : $mimetype = 'image/vnd.microsoft.icon'; break;
  96      default: $mimetype = 'document/unknown';
  97  }
  98  
  99  // if they are requesting a revision that's not -1, and they have supplied an
 100  // If-Modified-Since header, we can send back a 304 Not Modified since the
 101  // content never changes (the rev number is increased any time the content changes)
 102  if (strpos($path, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
 103      $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 104      header('HTTP/1.1 304 Not Modified');
 105      header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
 106      header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 107      header('Cache-Control: public, max-age='.$lifetime.', no-transform');
 108      header('Content-Type: '.$mimetype);
 109      header('Etag: "'.$etag.'"');
 110      die;
 111  }
 112  
 113  yui_image_cached($imagepath, $imagename, $mimetype, $etag);
 114  
 115  
 116  function yui_image_cached($imagepath, $imagename, $mimetype, $etag) {
 117      global $CFG;
 118      require("$CFG->dirroot/lib/xsendfilelib.php");
 119  
 120      $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 121  
 122      header('Content-Disposition: inline; filename="'.$imagename.'"');
 123      header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
 124      header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 125      header('Pragma: ');
 126      header('Cache-Control: public, max-age='.$lifetime.', no-transform, immutable');
 127      header('Accept-Ranges: none');
 128      header('Content-Type: '.$mimetype);
 129      header('Content-Length: '.filesize($imagepath));
 130      header('Etag: "'.$etag.'"');
 131  
 132      if (xsendfile($imagepath)) {
 133          die;
 134      }
 135  
 136      // no need to gzip already compressed images ;-)
 137  
 138      readfile($imagepath);
 139      die;
 140  }
 141  
 142  function yui_image_not_found() {
 143      header('HTTP/1.0 404 not found');
 144      die('Image was not found, sorry.');
 145  }