weekly release 4.0dev
[moodle.git] / theme / yui_image.php
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60f2c866 1<?php
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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 *
574909ef 20 * @package core
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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
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26// disable moodle specific debug messages and any errors in output,
27// comment out when debugging or better look into error log!
28define('NO_DEBUG_DISPLAY', true);
29
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30// we need just the values from config.php and minlib.php
31define('ABORT_AFTER_CONFIG', true);
32require('../config.php'); // this stops immediately at the beginning of lib/setup.php
33
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34if ($slashargument = min_get_slash_argument()) {
35 $path = ltrim($slashargument, '/');
36} else {
37 $path = min_optional_param('file', '', 'SAFEPATH');
38}
60f2c866 39
1c6d3af5 40$etag = sha1($path);
60f2c866 41$parts = explode('/', $path);
2a102b90 42$version = array_shift($parts);
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43if ($version === 'm') {
44 $version = 'moodle';
45}
3b17690c 46if ($version == 'moodle' && count($parts) >= 3) {
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47 $frankenstyle = array_shift($parts);
48 $module = array_shift($parts);
49 $image = array_pop($parts);
50 $subdir = join('/', $parts);
cba94cec 51 $dir = core_component::get_component_directory($frankenstyle);
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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/' . $image;
62 }
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63} else if ($version == 'gallery' && count($parts) >= 3) {
64 list($revision, $module, , , , $image) = $parts;
65 $imagepath = "$CFG->dirroot/lib/yuilib/gallery/$module/assets/skins/sam/$image";
60f2c866 66} else {
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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 }
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81}
82
83if (!file_exists($imagepath)) {
84 yui_image_not_found();
85}
86
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87$pathinfo = pathinfo($imagepath);
88$imagename = $pathinfo['filename'].'.'.$pathinfo['extension'];
89
90switch($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: $mimetype = 'document/unknown';
97}
98
99// if they are requesting a revision that's not -1, and they have supplied an
100// If-Modified-Since header, we can send back a 304 Not Modified since the
101// content never changes (the rev number is increased any time the content changes)
1c6d3af5 102if (strpos($path, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
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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() + $lifetime) .' GMT');
c3a3f540 107 header('Cache-Control: public, max-age='.$lifetime.', no-transform');
dbe14f39 108 header('Content-Type: '.$mimetype);
06eca486 109 header('Etag: "'.$etag.'"');
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110 die;
111}
60f2c866 112
dbe14f39 113yui_image_cached($imagepath, $imagename, $mimetype, $etag);
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114
115
dbe14f39 116function yui_image_cached($imagepath, $imagename, $mimetype, $etag) {
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117 global $CFG;
118 require("$CFG->dirroot/lib/xsendfilelib.php");
119
dbe14f39 120 $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
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121
122 header('Content-Disposition: inline; filename="'.$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() + $lifetime) .' GMT');
125 header('Pragma: ');
203c5bce 126 header('Cache-Control: public, max-age='.$lifetime.', no-transform, immutable');
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127 header('Accept-Ranges: none');
128 header('Content-Type: '.$mimetype);
129 header('Content-Length: '.filesize($imagepath));
06eca486 130 header('Etag: "'.$etag.'"');
60f2c866 131
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132 if (xsendfile($imagepath)) {
133 die;
134 }
135
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136 // no need to gzip already compressed images ;-)
137
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138 readfile($imagepath);
139 die;
140}
141
142function yui_image_not_found() {
143 header('HTTP/1.0 404 not found');
144 die('Image was not found, sorry.');
145}