theme/yui_image.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * This file is responsible for serving of yui images
  20  *
  21  * @package   moodlecore
  22  * @copyright 2009 Petr Skoda (skodak)  {@link http://skodak.org}
  23  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26
  27 // disable moodle specific debug messages and any errors in output,
  28 // comment out when debugging or better look into error log!
  29 define('NO_DEBUG_DISPLAY', true);
  30
  31 // we need just the values from config.php and minlib.php
  32 define('ABORT_AFTER_CONFIG', true);
  33 require('../config.php'); // this stops immediately at the beginning of lib/setup.php
  34
  35 if ($slashargument = min_get_slash_argument()) {
  36     $path = ltrim($slashargument, '/');
  37 } else {
  38     $path = min_optional_param('file', '', 'SAFEPATH');
  39 }
  40
  41 $etag = sha1($path);
  42 $parts = explode('/', $path);
  43 $version = array_shift($parts);
  44 if ($version == 'moodle' && count($parts) >= 3) {
  45     if (!defined('ABORT_AFTER_CONFIG_CANCEL')) {
  46         define('ABORT_AFTER_CONFIG_CANCEL', true);
  47         define('NO_UPGRADE_CHECK', true);
  48         define('NO_MOODLE_COOKIES', true);
  49         require($CFG->libdir.'/setup.php');
  50     }
  51     $frankenstyle = array_shift($parts);
  52     $module = array_shift($parts);
  53     $image = array_pop($parts);
  54     $subdir = join('/', $parts);
  55     $dir = get_component_directory($frankenstyle);
  56
  57     // For shifted YUI modules, we need the YUI module name in frankenstyle format.
  58     $frankenstylemodulename = join('-', array($version, $frankenstyle, $module));
  59
  60     // By default, try and use the /yui/build directory.
  61     $imagepath = $dir . '/yui/build/' . $frankenstylemodulename . '/assets/skins/sam/' . $image;
  62
  63     // If the shifted versions don't exist, fall back to the non-shifted file.
  64     if (!file_exists($imagepath) or !is_file($imagepath)) {
  65         $imagepath = $dir . '/yui/' . $module . '/assets/skins/sam/' . $image;
  66     }
  67 } else if ($version == 'gallery' && count($parts)==3) {
  68     list($module, $version, $image) = $parts;
  69     $imagepath = "$CFG->dirroot/lib/yui/gallery/$module/$version/assets/skins/sam/$image";
  70 } else if (count($parts) == 1 && ($version == $CFG->yui3version || $version == $CFG->yui2version)) {
  71     list($image) = $parts;
  72     if ($version == $CFG->yui3version) {
  73         $imagepath = "$CFG->dirroot/lib/yuilib/$CFG->yui3version/build/assets/skins/sam/$image";
  74     } else  {
  75         $imagepath = "$CFG->dirroot/lib/yuilib/2in3/$CFG->yui2version/build/assets/skins/sam/$image";
  76     }
  77 } else {
  78     yui_image_not_found();
  79 }
  80
  81 if (!file_exists($imagepath)) {
  82     yui_image_not_found();
  83 }
  84
  85 $pathinfo = pathinfo($imagepath);
  86 $imagename = $pathinfo['filename'].'.'.$pathinfo['extension'];
  87
  88 switch($pathinfo['extension']) {
  89     case 'gif'  : $mimetype = 'image/gif'; break;
  90     case 'png'  : $mimetype = 'image/png'; break;
  91     case 'jpg'  : $mimetype = 'image/jpeg'; break;
  92     case 'jpeg' : $mimetype = 'image/jpeg'; break;
  93     case 'ico'  : $mimetype = 'image/vnd.microsoft.icon'; break;
  94     default: $mimetype = 'document/unknown';
  95 }
  96
  97 // if they are requesting a revision that's not -1, and they have supplied an
  98 // If-Modified-Since header, we can send back a 304 Not Modified since the
  99 // content never changes (the rev number is increased any time the content changes)
 100 if (strpos($path, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
 101     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 102     header('HTTP/1.1 304 Not Modified');
 103     header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
 104     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 105     header('Cache-Control: public, max-age='.$lifetime);
 106     header('Content-Type: '.$mimetype);
 107     header('Etag: '.$etag);
 108     die;
 109 }
 110
 111 yui_image_cached($imagepath, $imagename, $mimetype, $etag);
 112
 113
 114 function yui_image_cached($imagepath, $imagename, $mimetype, $etag) {
 115     global $CFG;
 116     require("$CFG->dirroot/lib/xsendfilelib.php");
 117
 118     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 119
 120     header('Content-Disposition: inline; filename="'.$imagename.'"');
 121     header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
 122     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 123     header('Pragma: ');
 124     header('Cache-Control: public, max-age=315360000');
 125     header('Accept-Ranges: none');
 126     header('Content-Type: '.$mimetype);
 127     header('Content-Length: '.filesize($imagepath));
 128     header('Etag: '.$etag);
 129
 130     if (xsendfile($imagepath)) {
 131         die;
 132     }
 133
 134     // no need to gzip already compressed images ;-)
 135
 136     readfile($imagepath);
 137     die;
 138 }
 139
 140 function yui_image_not_found() {
 141     header('HTTP/1.0 404 not found');
 142     die('Image was not found, sorry.');
 143 }