theme/yui_combo.php

   1 <?php
   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 Javascript and CSS
  19  *
  20  * @package   core
  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
  26 // disable moodle specific debug messages and any errors in output,
  27 // comment out when debugging or better look into error log!
  28 define('NO_DEBUG_DISPLAY', true);
  29
  30 // we need just the values from config.php and minlib.php
  31 define('ABORT_AFTER_CONFIG', true);
  32 require('../config.php'); // this stops immediately at the beginning of lib/setup.php
  33
  34 // get special url parameters
  35
  36 list($parts, $slasharguments) = combo_params();
  37 if (!$parts) {
  38     combo_not_found();
  39 }
  40
  41 $etag = sha1($parts);
  42 $parts = trim($parts, '&');
  43
  44 // find out what we are serving - only one type per request
  45 $content = '';
  46 if (substr($parts, -3) === '.js') {
  47     $mimetype = 'application/javascript';
  48 } else if (substr($parts, -4) === '.css') {
  49     $mimetype = 'text/css';
  50 } else {
  51     combo_not_found();
  52 }
  53
  54 // if they are requesting a revision that's not -1, and they have supplied an
  55 // If-Modified-Since header, we can send back a 304 Not Modified since the
  56 // content never changes (the rev number is increased any time the content changes)
  57 if (strpos($parts, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
  58     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
  59     header('HTTP/1.1 304 Not Modified');
  60     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
  61     header('Cache-Control: public, max-age='.$lifetime);
  62     header('Content-Type: '.$mimetype);
  63     header('Etag: "'.$etag.'"');
  64     die;
  65 }
  66
  67 $parts = explode('&', $parts);
  68 $cache = true;
  69 $lastmodified = 0;
  70
  71 while (count($parts)) {
  72     $part = array_shift($parts);
  73     if (empty($part)) {
  74         continue;
  75     }
  76     $filecontent = '';
  77     $part = min_clean_param($part, 'SAFEPATH');
  78     $bits = explode('/', $part);
  79     if (count($bits) < 2) {
  80         $content .= "\n// Wrong combo resource $part!\n";
  81         continue;
  82     }
  83
  84     $version = array_shift($bits);
  85     if ($version === 'rollup') {
  86         $yuipatchedversion = explode('_', array_shift($bits));
  87         $revision = $yuipatchedversion[0];
  88         $rollupname = array_shift($bits);
  89
  90         if (strpos($rollupname, 'yui-moodlesimple') !== false) {
  91             if (substr($rollupname, -3) === '.js') {
  92                 // Determine which version of this rollup should be used.
  93                 $filesuffix = '.js';
  94                 preg_match('/(-(debug|min))?\.js/', $rollupname, $matches);
  95                 if (isset($matches[1])) {
  96                     $filesuffix = $matches[0];
  97                 }
  98
  99                 $type = 'js';
 100             } else if (substr($rollupname, -4) === '.css') {
 101                 $type = 'css';
 102             } else {
 103                 continue;
 104             }
 105
 106             // Allow support for revisions on YUI between official releases.
 107             // We can just discard the subrevision since it is only used to invalidate the browser cache.
 108             $yuipatchedversion = explode('_', $revision);
 109             $yuiversion = $yuipatchedversion[0];
 110
 111             $yuimodules = array(
 112                 'yui',
 113                 'oop',
 114                 'event-custom-base',
 115                 'dom-core',
 116                 'dom-base',
 117                 'color-base',
 118                 'dom-style',
 119                 'selector-native',
 120                 'selector',
 121                 'node-core',
 122                 'node-base',
 123                 'event-base',
 124                 'event-base-ie',
 125                 'pluginhost-base',
 126                 'pluginhost-config',
 127                 'event-delegate',
 128                 'node-event-delegate',
 129                 'node-pluginhost',
 130                 'dom-screen',
 131                 'node-screen',
 132                 'node-style',
 133                 'querystring-stringify-simple',
 134                 'io-base',
 135                 'json-parse',
 136                 'transition',
 137                 'selector-css2',
 138                 'selector-css3',
 139                 'dom-style-ie',
 140
 141                 // Some extras we use everywhere.
 142                 'escape',
 143
 144                 'attribute-core',
 145                 'event-custom-complex',
 146                 'base-core',
 147                 'attribute-base',
 148                 'attribute-extras',
 149                 'attribute-observable',
 150                 'base-observable',
 151                 'base-base',
 152                 'base-pluginhost',
 153                 'base-build',
 154                 'event-synthetic',
 155
 156                 'attribute-complex',
 157                 'event-mouseenter',
 158                 'event-key',
 159                 'event-outside',
 160                 'event-focus',
 161                 'classnamemanager',
 162                 'widget-base',
 163                 'widget-htmlparser',
 164                 'widget-skin',
 165                 'widget-uievents',
 166                 'widget-stdmod',
 167                 'widget-position',
 168                 'widget-position-align',
 169                 'widget-stack',
 170                 'widget-position-constrain',
 171                 'overlay',
 172
 173                 'widget-autohide',
 174                 'button-core',
 175                 'button-plugin',
 176                 'widget-buttons',
 177                 'widget-modality',
 178                 'panel',
 179                 'yui-throttle',
 180                 'dd-ddm-base',
 181                 'dd-drag',
 182                 'dd-plugin',
 183
 184                 // Cache is used by moodle-core-tooltip which we include everywhere.
 185                 'cache-base',
 186             );
 187
 188             // We need to add these new parts to the beginning of the $parts list, not the end.
 189             if ($type === 'js') {
 190                 $newparts = array();
 191                 foreach ($yuimodules as $module) {
 192                     $newparts[] = $yuiversion . '/' . $module . '/' . $module . $filesuffix;
 193                 }
 194                 $newparts[] = 'yuiuseall/yuiuseall';
 195                 $parts = array_merge($newparts, $parts);
 196             } else {
 197                 $newparts = array();
 198                 foreach ($yuimodules as $module) {
 199                     $candidate =  $yuiversion . '/' . $module . '/assets/skins/sam/' . $module . '.css';
 200                     if (!file_exists("$CFG->libdir/yuilib/$candidate")) {
 201                         continue;
 202                     }
 203                     $newparts[] = $candidate;
 204                 }
 205                 if ($newparts) {
 206                     $parts = array_merge($newparts, $parts);
 207                 }
 208             }
 209         }
 210
 211         continue;
 212     }
 213     if ($version === 'm') {
 214         $version = 'moodle';
 215     }
 216     if ($version === 'moodle') {
 217         if (count($bits) <= 3) {
 218             // This is an invalid module load attempt.
 219             $content .= "\n// Incorrect moodle module inclusion. Not enough component information in {$part}.\n";
 220             continue;
 221         }
 222         $revision = (int)array_shift($bits);
 223         if ($revision === -1) {
 224             // Revision -1 says please don't cache the JS
 225             $cache = false;
 226         }
 227         $frankenstyle = array_shift($bits);
 228         $filename = array_pop($bits);
 229         $modulename = $bits[0];
 230         $dir = core_component::get_component_directory($frankenstyle);
 231
 232         // For shifted YUI modules, we need the YUI module name in frankenstyle format.
 233         $frankenstylemodulename = join('-', array($version, $frankenstyle, $modulename));
 234         $frankenstylefilename = preg_replace('/' . $modulename . '/', $frankenstylemodulename, $filename);
 235
 236         // Submodules are stored in a directory with the full submodule name.
 237         // We need to remove the -debug.js, -min.js, and .js from the file name to calculate that directory name.
 238         $frankenstyledirectoryname = str_replace(array('-min.js', '-debug.js', '.js', '.css'), '', $frankenstylefilename);
 239
 240         // By default, try and use the /yui/build directory.
 241         $contentfile = $dir . '/yui/build/' . $frankenstyledirectoryname;
 242         if ($mimetype == 'text/css') {
 243             // CSS assets are in a slightly different place to the JS.
 244             $contentfile = $contentfile . '/assets/skins/sam/' . $frankenstylefilename;
 245
 246             // Add the path to the bits to handle fallback for non-shifted assets.
 247             $bits[] = 'assets';
 248             $bits[] = 'skins';
 249             $bits[] = 'sam';
 250         } else {
 251             $contentfile = $contentfile . '/' . $frankenstylefilename;
 252         }
 253
 254         // If the shifted versions don't exist, fall back to the non-shifted file.
 255         if (!file_exists($contentfile) or !is_file($contentfile)) {
 256             // We have to revert to the non-minified and non-debug versions.
 257             $filename = preg_replace('/-(min|debug)\./', '.', $filename);
 258             $contentfile = $dir . '/yui/' . join('/', $bits) . '/' . $filename;
 259         }
 260     } else if ($version === '2in3') {
 261         $contentfile = "$CFG->libdir/yuilib/$part";
 262
 263     } else if ($version == 'gallery') {
 264         if (count($bits) <= 2) {
 265             // This is an invalid module load attempt.
 266             $content .= "\n// Incorrect moodle module inclusion. Not enough component information in {$part}.\n";
 267             continue;
 268         }
 269         $revision = (int)array_shift($bits);
 270         if ($revision === -1) {
 271             // Revision -1 says please don't cache the JS
 272             $cache = false;
 273         }
 274         $contentfile = "$CFG->libdir/yuilib/gallery/" . join('/', $bits);
 275
 276     } else if ($version == 'yuiuseall') {
 277         // Create global Y that is available in global scope,
 278         // this is the trick behind original SimpleYUI.
 279         $filecontent = "var Y = YUI().use('*');";
 280
 281     } else {
 282         // Allow support for revisions on YUI between official releases.
 283         // We can just discard the subrevision since it is only used to invalidate the browser cache.
 284         $yuipatchedversion = explode('_', $version);
 285         $yuiversion = $yuipatchedversion[0];
 286         if ($yuiversion != $CFG->yui3version) {
 287             $content .= "\n// Wrong yui version $part!\n";
 288             continue;
 289         }
 290         $newpart = explode('/', $part);
 291         $newpart[0] = $yuiversion;
 292         $part = implode('/', $newpart);
 293         $contentfile = "$CFG->libdir/yuilib/$part";
 294     }
 295     if (!file_exists($contentfile) or !is_file($contentfile)) {
 296         $location = '$CFG->dirroot'.preg_replace('/^'.preg_quote($CFG->dirroot, '/').'/', '', $contentfile);
 297         $content .= "\n// Combo resource $part ($location) not found!\n";
 298         continue;
 299     }
 300
 301     if (empty($filecontent)) {
 302         $filecontent = file_get_contents($contentfile);
 303     }
 304     $fmodified = filemtime($contentfile);
 305     if ($fmodified > $lastmodified) {
 306         $lastmodified = $fmodified;
 307     }
 308
 309     $relroot = preg_replace('|^http.?://[^/]+|', '', $CFG->wwwroot);
 310     $sep = ($slasharguments ? '/' : '?file=');
 311
 312     if ($mimetype === 'text/css') {
 313         if ($version == 'moodle') {
 314             // Search for all images in the file and replace with an appropriate link to the yui_image.php script
 315             $imagebits = array(
 316                 $sep . $version,
 317                 $frankenstyle,
 318                 $modulename,
 319                 array_shift($bits),
 320                 '$1.$2'
 321             );
 322
 323             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot . '/theme/yui_image.php' . implode('/', $imagebits), $filecontent);
 324         } else if ($version == '2in3') {
 325             // First we need to remove relative paths to images. These are used by YUI modules to make use of global assets.
 326             // I've added this as a separate regex so it can be easily removed once
 327             // YUI standardise there CSS methods
 328             $filecontent = preg_replace('#(\.\./\.\./\.\./\.\./assets/skins/sam/)?([a-z0-9_-]+)\.(png|gif)#', '$2.$3', $filecontent);
 329
 330             // search for all images in yui2 CSS and serve them through the yui_image.php script
 331             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$CFG->yui2version.'/$1.$2', $filecontent);
 332
 333         } else if ($version == 'gallery') {
 334             // Replace any references to the CDN with a relative link.
 335             $filecontent = preg_replace('#(' . preg_quote('http://yui.yahooapis.com/') . '(gallery-[^/]*/))#', '../../../../', $filecontent);
 336
 337             // Replace all relative image links with the a link to yui_image.php.
 338             $filecontent = preg_replace('#(' . preg_quote('../../../../') . ')(gallery-[^/]*/assets/skins/sam/[a-z0-9_-]+)\.(png|gif)#',
 339                     $relroot . '/theme/yui_image.php' . $sep . '/gallery/' . $revision . '/$2.$3', $filecontent);
 340
 341         } else {
 342             // First we need to remove relative paths to images. These are used by YUI modules to make use of global assets.
 343             // I've added this as a separate regex so it can be easily removed once
 344             // YUI standardise there CSS methods
 345             $filecontent = preg_replace('#(\.\./\.\./\.\./\.\./assets/skins/sam/)?([a-z0-9_-]+)\.(png|gif)#', '$2.$3', $filecontent);
 346
 347             // search for all images in yui2 CSS and serve them through the yui_image.php script
 348             $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/$1.$2', $filecontent);
 349         }
 350     }
 351
 352     $content .= $filecontent;
 353 }
 354
 355 if ($lastmodified == 0) {
 356     $lastmodified = time();
 357 }
 358
 359 if ($cache) {
 360     combo_send_cached($content, $mimetype, $etag, $lastmodified);
 361 } else {
 362     combo_send_uncached($content, $mimetype);
 363 }
 364
 365
 366 /**
 367  * Send the JavaScript cached
 368  * @param string $content
 369  * @param string $mimetype
 370  * @param string $etag
 371  * @param int $lastmodified
 372  */
 373 function combo_send_cached($content, $mimetype, $etag, $lastmodified) {
 374     $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 375
 376     header('Content-Disposition: inline; filename="combo"');
 377     header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
 378     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 379     header('Pragma: ');
 380     header('Cache-Control: public, max-age='.$lifetime.', immutable');
 381     header('Accept-Ranges: none');
 382     header('Content-Type: '.$mimetype);
 383     header('Etag: "'.$etag.'"');
 384     if (!min_enable_zlib_compression()) {
 385         header('Content-Length: '.strlen($content));
 386     }
 387
 388     echo $content;
 389     die;
 390 }
 391
 392 /**
 393  * Send the JavaScript uncached
 394  * @param string $content
 395  * @param string $mimetype
 396  */
 397 function combo_send_uncached($content, $mimetype) {
 398     header('Content-Disposition: inline; filename="combo"');
 399     header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 400     header('Expires: '. gmdate('D, d M Y H:i:s', time() + 2) .' GMT');
 401     header('Pragma: ');
 402     header('Accept-Ranges: none');
 403     header('Content-Type: '.$mimetype);
 404     if (!min_enable_zlib_compression()) {
 405         header('Content-Length: '.strlen($content));
 406     }
 407
 408     echo $content;
 409     die;
 410 }
 411
 412 function combo_not_found($message = '') {
 413     header('HTTP/1.0 404 not found');
 414     if ($message) {
 415         echo $message;
 416     } else {
 417         echo 'Combo resource not found, sorry.';
 418     }
 419     die;
 420 }
 421
 422 function combo_params() {
 423     if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], 'file=/') === 0) {
 424         // url rewriting
 425         $slashargument = substr($_SERVER['QUERY_STRING'], 6);
 426         return array($slashargument, true);
 427
 428     } else if (isset($_SERVER['REQUEST_URI']) and strpos($_SERVER['REQUEST_URI'], '?') !== false) {
 429         $parts = explode('?', $_SERVER['REQUEST_URI'], 2);
 430         return array($parts[1], false);
 431
 432     } else if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], '?') !== false) {
 433         // note: buggy or misconfigured IIS does return the query string in REQUEST_URI
 434         return array($_SERVER['QUERY_STRING'], false);
 435
 436     } else if ($slashargument = min_get_slash_argument(false)) {
 437         $slashargument = ltrim($slashargument, '/');
 438         return array($slashargument, true);
 439
 440     } else {
 441         // unsupported server, sorry!
 442         combo_not_found('Unsupported server - query string can not be determined, try disabling YUI combo loading in admin settings.');
 443     }
 444 }