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
  45 if ($version == 'moodle' && count($parts) >= 3) {
  46     //TODO: this is a ugly hack because we should not load any libs here!
  47     define('MOODLE_INTERNAL', true);
  48     require_once($CFG->libdir.'/moodlelib.php');
  49     $frankenstyle = array_shift($parts);
  50     $module = array_shift($parts);
  51     $image = array_pop($parts);
  52     $subdir = join('/', $parts);
  53     $dir = get_component_directory($frankenstyle);
  54     $imagepath = $dir.'/yui/'.$module.'/assets/skins/sam/'.$image;
  55 } else if ($version == 'gallery' && count($parts)==3) {
  56     list($module, $version, $image) = $parts;
  57     $imagepath = "$CFG->dirroot/lib/yui/gallery/$module/$version/assets/skins/sam/$image";
  58 } else if (count($parts) == 1 && ($version == $CFG->yui3version || $version == $CFG->yui2version)) {
  59     list($image) = $parts;
  60     if ($version == $CFG->yui3version) {
  61         $imagepath = "$CFG->dirroot/lib/yui/$CFG->yui3version/build/assets/skins/sam/$image";
  62     } else  {
  63         $imagepath = "$CFG->dirroot/lib/yui/$CFG->yui2version/build/assets/skins/sam/$image";
  64     }
  65 } else {
  66     yui_image_not_found();
  67 }
  68
  69 if (!file_exists($imagepath)) {
  70     yui_image_not_found();
  71 }
  72
  73 $pathinfo = pathinfo($imagepath);
  74 $imagename = $pathinfo['filename'].'.'.$pathinfo['extension'];
  75
  76 switch($pathinfo['extension']) {
  77     case 'gif'  : $mimetype = 'image/gif'; break;
  78     case 'png'  : $mimetype = 'image/png'; break;
  79     case 'jpg'  : $mimetype = 'image/jpeg'; break;
  80     case 'jpeg' : $mimetype = 'image/jpeg'; break;
  81     case 'ico'  : $mimetype = 'image/vnd.microsoft.icon'; break;
  82     default: $mimetype = 'document/unknown';
  83 }
  84
  85 // if they are requesting a revision that's not -1, and they have supplied an
  86 // If-Modified-Since header, we can send back a 304 Not Modified since the
  87 // content never changes (the rev number is increased any time the content changes)
  88 if (strpos($path, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
  89     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
  90     header('HTTP/1.1 304 Not Modified');
  91     header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
  92     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
  93     header('Cache-Control: public, max-age='.$lifetime);
  94     header('Content-Type: '.$mimetype);
  95     header('Etag: '.$etag);
  96     die;
  97 }
  98
  99 yui_image_cached($imagepath, $imagename, $mimetype, $etag);
 100
 101
 102 function yui_image_cached($imagepath, $imagename, $mimetype, $etag) {
 103     global $CFG;
 104     require("$CFG->dirroot/lib/xsendfilelib.php");
 105
 106     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 107
 108     header('Content-Disposition: inline; filename="'.$imagename.'"');
 109     header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
 110     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 111     header('Pragma: ');
 112     header('Cache-Control: public, max-age=315360000');
 113     header('Accept-Ranges: none');
 114     header('Content-Type: '.$mimetype);
 115     header('Content-Length: '.filesize($imagepath));
 116     header('Etag: '.$etag);
 117
 118     if (xsendfile($imagepath)) {
 119         die;
 120     }
 121
 122     // no need to gzip already compressed images ;-)
 123
 124     readfile($imagepath);
 125     die;
 126 }
 127
 128 function yui_image_not_found() {
 129     header('HTTP/1.0 404 not found');
 130     die('Image was not found, sorry.');
 131 }