theme/yui_combo.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 // get special url parameters
  36
  37 list($parts, $slasharguments) = combo_params();
  38 if (!$parts) {
  39     combo_not_found();
  40 }
  41
  42 $etag = sha1($parts);
  43 $parts = trim($parts, '&');
  44
  45 // find out what we are serving - only one type per request
  46 $content = '';
  47 if (substr($parts, -3) === '.js') {
  48     $mimetype = 'application/javascript';
  49 } else if (substr($parts, -4) === '.css') {
  50     $mimetype = 'text/css';
  51 } else {
  52     combo_not_found();
  53 }
  54
  55 // if they are requesting a revision that's not -1, and they have supplied an
  56 // If-Modified-Since header, we can send back a 304 Not Modified since the
  57 // content never changes (the rev number is increased any time the content changes)
  58 if (strpos($parts, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
  59     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
  60     header('HTTP/1.1 304 Not Modified');
  61     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
  62     header('Cache-Control: public, max-age='.$lifetime);
  63     header('Content-Type: '.$mimetype);
  64     header('Etag: '.$etag);
  65     die;
  66 }
  67
  68 $parts = explode('&', $parts);
  69 $cache = true;
  70 $lastmodified = 0;
  71
  72 foreach ($parts as $part) {
  73     if (empty($part)) {
  74         continue;
  75     }
  76     $part = min_clean_param($part, 'SAFEPATH');
  77     $bits = explode('/', $part);
  78     if (count($bits) < 2) {
  79         $content .= "\n// Wrong combo resource $part!\n";
  80         continue;
  81     }
  82     //debug($bits);
  83     $version = array_shift($bits);
  84     if ($version == 'moodle') {
  85         //TODO: this is a ugly hack because we should not load any libs here!
  86         if (!defined('MOODLE_INTERNAL')) {
  87             define('MOODLE_INTERNAL', true);
  88             require_once($CFG->libdir.'/moodlelib.php');
  89         }
  90         $revision = (int)array_shift($bits);
  91         if ($revision === -1) {
  92             // Revision -1 says please don't cache the JS
  93             $cache = false;
  94         }
  95         $frankenstyle = array_shift($bits);
  96         $filename = array_pop($bits);
  97         $dir = get_component_directory($frankenstyle);
  98         if ($mimetype == 'text/css') {
  99             $bits[] = 'assets';
 100             $bits[] = 'skins';
 101             $bits[] = 'sam';
 102         }
 103         $contentfile = $dir.'/yui/'.join('/', $bits).'/'.$filename;
 104     } else {
 105         if ($version != $CFG->yui3version and $version != $CFG->yui2version and $version != 'gallery') {
 106             $content .= "\n// Wrong yui version $part!\n";
 107             continue;
 108         }
 109         $contentfile = "$CFG->libdir/yui/$part";
 110     }
 111     if (!file_exists($contentfile) or !is_file($contentfile)) {
 112         $content .= "\n// Combo resource $part ($contentfile) not found!\n";
 113         continue;
 114     }
 115     $filecontent = file_get_contents($contentfile);
 116     $fmodified = filemtime($contentfile);
 117     if ($fmodified > $lastmodified) {
 118         $lastmodified = $fmodified;
 119     }
 120
 121     $relroot = preg_replace('|^http.?://[^/]+|', '', $CFG->wwwroot);
 122     $sep = ($slasharguments ? '/' : '?file=');
 123
 124     if ($mimetype === 'text/css') {
 125         if ($version == 'moodle') {
 126             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/'.$frankenstyle.'/'.array_shift($bits).'/$1.$2', $filecontent);
 127         } else if ($version == 'gallery') {
 128             // search for all images in gallery module CSS and serve them through the yui_image.php script
 129             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/'.$bits[0].'/'.$bits[1].'/$1.$2', $filecontent);
 130         } else {
 131             // First we need to remove relative paths to images. These are used by YUI modules to make use of global assets.
 132             // I've added this as a separate regex so it can be easily removed once
 133             // YUI standardise there CSS methods
 134             $filecontent = preg_replace('#(\.\./\.\./\.\./\.\./assets/skins/sam/)?([a-z0-9_-]+)\.(png|gif)#', '$2.$3', $filecontent);
 135
 136             // search for all images in yui2 CSS and serve them through the yui_image.php script
 137             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/$1.$2', $filecontent);
 138         }
 139     }
 140
 141     $content .= $filecontent;
 142 }
 143
 144 if ($lastmodified == 0) {
 145     $lastmodified = time();
 146 }
 147
 148 if ($cache) {
 149     combo_send_cached($content, $mimetype, $etag, $lastmodified);
 150 } else {
 151     combo_send_uncached($content, $mimetype);
 152 }
 153
 154
 155 /**
 156  * Send the JavaScript cached
 157  * @param string $content
 158  * @param string $mimetype
 159  * @param string $etag
 160  * @param int $lastmodified
 161  */
 162 function combo_send_cached($content, $mimetype, $etag, $lastmodified) {
 163     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 164
 165     header('Content-Disposition: inline; filename="combo"');
 166     header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
 167     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 168     header('Pragma: ');
 169     header('Cache-Control: max-age='.$lifetime);
 170     header('Accept-Ranges: none');
 171     header('Content-Type: '.$mimetype);
 172     header('Etag: '.$etag);
 173     if (!min_enable_zlib_compression()) {
 174         header('Content-Length: '.strlen($content));
 175     }
 176
 177     echo $content;
 178     die;
 179 }
 180
 181 /**
 182  * Send the JavaScript uncached
 183  * @param string $content
 184  * @param string $mimetype
 185  */
 186 function combo_send_uncached($content, $mimetype) {
 187     header('Content-Disposition: inline; filename="combo"');
 188     header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 189     header('Expires: '. gmdate('D, d M Y H:i:s', time() + 2) .' GMT');
 190     header('Pragma: ');
 191     header('Accept-Ranges: none');
 192     header('Content-Type: '.$mimetype);
 193     if (!min_enable_zlib_compression()) {
 194         header('Content-Length: '.strlen($content));
 195     }
 196
 197     echo $content;
 198     die;
 199 }
 200
 201 function combo_not_found($message = '') {
 202     header('HTTP/1.0 404 not found');
 203     if ($message) {
 204         echo $message;
 205     } else {
 206         echo 'Combo resource not found, sorry.';
 207     }
 208     die;
 209 }
 210
 211 function combo_params() {
 212     if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], 'file=/') === 0) {
 213         // url rewriting
 214         $slashargument = substr($_SERVER['QUERY_STRING'], 6);
 215         return array($slashargument, true);
 216
 217     } else if (isset($_SERVER['REQUEST_URI']) and strpos($_SERVER['REQUEST_URI'], '?') !== false) {
 218         $parts = explode('?', $_SERVER['REQUEST_URI'], 2);
 219         return array($parts[1], false);
 220
 221     } else if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], '?') !== false) {
 222         // note: buggy or misconfigured IIS does return the query string in REQUEST_URI
 223         return array($_SERVER['QUERY_STRING'], false);
 224
 225     } else if ($slashargument = min_get_slash_argument()) {
 226         $slashargument = ltrim($slashargument, '/');
 227         return array($slashargument, true);
 228
 229     } else {
 230         // unsupported server, sorry!
 231         combo_not_found('Unsupported server - query string can not be determined, try disabling YUI combo loading in admin settings.');
 232     }
 233 }