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         $location = '$CFG->dirroot'.preg_replace('/^'.preg_quote($CFG->dirroot, '/').'/', '', $contentfile);
 113         $content .= "\n// Combo resource $part ($location) not found!\n";
 114         continue;
 115     }
 116     $filecontent = file_get_contents($contentfile);
 117     $fmodified = filemtime($contentfile);
 118     if ($fmodified > $lastmodified) {
 119         $lastmodified = $fmodified;
 120     }
 121
 122     $relroot = preg_replace('|^http.?://[^/]+|', '', $CFG->wwwroot);
 123     $sep = ($slasharguments ? '/' : '?file=');
 124
 125     if ($mimetype === 'text/css') {
 126         if ($version == 'moodle') {
 127             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/'.$frankenstyle.'/'.array_shift($bits).'/$1.$2', $filecontent);
 128         } else if ($version == 'gallery') {
 129             // search for all images in gallery module CSS and serve them through the yui_image.php script
 130             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/'.$bits[0].'/'.$bits[1].'/$1.$2', $filecontent);
 131         } else {
 132             // First we need to remove relative paths to images. These are used by YUI modules to make use of global assets.
 133             // I've added this as a separate regex so it can be easily removed once
 134             // YUI standardise there CSS methods
 135             $filecontent = preg_replace('#(\.\./\.\./\.\./\.\./assets/skins/sam/)?([a-z0-9_-]+)\.(png|gif)#', '$2.$3', $filecontent);
 136
 137             // search for all images in yui2 CSS and serve them through the yui_image.php script
 138             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/$1.$2', $filecontent);
 139         }
 140     }
 141
 142     $content .= $filecontent;
 143 }
 144
 145 if ($lastmodified == 0) {
 146     $lastmodified = time();
 147 }
 148
 149 if ($cache) {
 150     combo_send_cached($content, $mimetype, $etag, $lastmodified);
 151 } else {
 152     combo_send_uncached($content, $mimetype);
 153 }
 154
 155
 156 /**
 157  * Send the JavaScript cached
 158  * @param string $content
 159  * @param string $mimetype
 160  * @param string $etag
 161  * @param int $lastmodified
 162  */
 163 function combo_send_cached($content, $mimetype, $etag, $lastmodified) {
 164     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 165
 166     header('Content-Disposition: inline; filename="combo"');
 167     header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
 168     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 169     header('Pragma: ');
 170     header('Cache-Control: public, max-age='.$lifetime);
 171     header('Accept-Ranges: none');
 172     header('Content-Type: '.$mimetype);
 173     header('Etag: '.$etag);
 174     if (!min_enable_zlib_compression()) {
 175         header('Content-Length: '.strlen($content));
 176     }
 177
 178     echo $content;
 179     die;
 180 }
 181
 182 /**
 183  * Send the JavaScript uncached
 184  * @param string $content
 185  * @param string $mimetype
 186  */
 187 function combo_send_uncached($content, $mimetype) {
 188     header('Content-Disposition: inline; filename="combo"');
 189     header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 190     header('Expires: '. gmdate('D, d M Y H:i:s', time() + 2) .' GMT');
 191     header('Pragma: ');
 192     header('Accept-Ranges: none');
 193     header('Content-Type: '.$mimetype);
 194     if (!min_enable_zlib_compression()) {
 195         header('Content-Length: '.strlen($content));
 196     }
 197
 198     echo $content;
 199     die;
 200 }
 201
 202 function combo_not_found($message = '') {
 203     header('HTTP/1.0 404 not found');
 204     if ($message) {
 205         echo $message;
 206     } else {
 207         echo 'Combo resource not found, sorry.';
 208     }
 209     die;
 210 }
 211
 212 function combo_params() {
 213     if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], 'file=/') === 0) {
 214         // url rewriting
 215         $slashargument = substr($_SERVER['QUERY_STRING'], 6);
 216         return array($slashargument, true);
 217
 218     } else if (isset($_SERVER['REQUEST_URI']) and strpos($_SERVER['REQUEST_URI'], '?') !== false) {
 219         $parts = explode('?', $_SERVER['REQUEST_URI'], 2);
 220         return array($parts[1], false);
 221
 222     } else if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], '?') !== false) {
 223         // note: buggy or misconfigured IIS does return the query string in REQUEST_URI
 224         return array($_SERVER['QUERY_STRING'], false);
 225
 226     } else if ($slashargument = min_get_slash_argument()) {
 227         $slashargument = ltrim($slashargument, '/');
 228         return array($slashargument, true);
 229
 230     } else {
 231         // unsupported server, sorry!
 232         combo_not_found('Unsupported server - query string can not be determined, try disabling YUI combo loading in admin settings.');
 233     }
 234 }