includes/resourceloader/ResourceLoader.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @author Roan Kattouw
  20  * @author Trevor Parscal
  21  */
  22
  23 /**
  24  * Dynamic JavaScript and CSS resource loading system.
  25  *
  26  * Most of the documention is on the MediaWiki documentation wiki starting at:
  27  *    http://www.mediawiki.org/wiki/ResourceLoader
  28  */
  29 class ResourceLoader {
  30
  31         /* Protected Static Members */
  32
  33         /** Array: List of module name/ResourceLoaderModule object pairs */
  34         protected $modules = array();
  35         /** Associative array mapping module name to info associative array */
  36         protected $moduleInfos = array();
  37
  38         /* Protected Methods */
  39
  40         /**
  41          * Loads information stored in the database about modules.
  42          *
  43          * This method grabs modules dependencies from the database and updates modules
  44          * objects.
  45          *
  46          * This is not inside the module code because it is much faster to
  47          * request all of the information at once than it is to have each module
  48          * requests its own information. This sacrifice of modularity yields a substantial
  49          * performance improvement.
  50          *
  51          * @param $modules Array: List of module names to preload information for
  52          * @param $context ResourceLoaderContext: Context to load the information within
  53          */
  54         protected function preloadModuleInfo( array $modules, ResourceLoaderContext $context ) {
  55                 if ( !count( $modules ) ) {
  56                         return; // or else Database*::select() will explode, plus it's cheaper!
  57                 }
  58                 $dbr = wfGetDB( DB_SLAVE );
  59                 $skin = $context->getSkin();
  60                 $lang = $context->getLanguage();
  61
  62                 // Get file dependency information
  63                 $res = $dbr->select( 'module_deps', array( 'md_module', 'md_deps' ), array(
  64                                 'md_module' => $modules,
  65                                 'md_skin' => $context->getSkin()
  66                         ), __METHOD__
  67                 );
  68
  69                 // Set modules' dependecies
  70                 $modulesWithDeps = array();
  71                 foreach ( $res as $row ) {
  72                         $this->getModule( $row->md_module )->setFileDependencies( $skin,
  73                                 FormatJson::decode( $row->md_deps, true )
  74                         );
  75                         $modulesWithDeps[] = $row->md_module;
  76                 }
  77
  78                 // Register the absence of a dependency row too
  79                 foreach ( array_diff( $modules, $modulesWithDeps ) as $name ) {
  80                         $this->getModule( $name )->setFileDependencies( $skin, array() );
  81                 }
  82
  83                 // Get message blob mtimes. Only do this for modules with messages
  84                 $modulesWithMessages = array();
  85                 $modulesWithoutMessages = array();
  86                 foreach ( $modules as $name ) {
  87                         if ( count( $this->getModule( $name )->getMessages() ) ) {
  88                                 $modulesWithMessages[] = $name;
  89                         } else {
  90                                 $modulesWithoutMessages[] = $name;
  91                         }
  92                 }
  93                 if ( count( $modulesWithMessages ) ) {
  94                         $res = $dbr->select( 'msg_resource', array( 'mr_resource', 'mr_timestamp' ), array(
  95                                         'mr_resource' => $modulesWithMessages,
  96                                         'mr_lang' => $lang
  97                                 ), __METHOD__
  98                         );
  99                         foreach ( $res as $row ) {
 100                                 $this->getModule( $row->mr_resource )->setMsgBlobMtime( $lang, $row->mr_timestamp );
 101                         }
 102                 }
 103                 foreach ( $modulesWithoutMessages as $name ) {
 104                         $this->getModule( $name )->setMsgBlobMtime( $lang, 0 );
 105                 }
 106         }
 107
 108         /**
 109          * Runs JavaScript or CSS data through a filter, caching the filtered result for future calls.
 110          *
 111          * Available filters are:
 112          *  - minify-js \see JSMin::minify
 113          *  - minify-css \see CSSMin::minify
 114          *  - flip-css \see CSSJanus::transform
 115          *
 116          * If $data is empty, only contains whitespace or the filter was unknown,
 117          * $data is returned unmodified.
 118          *
 119          * @param $filter String: Name of filter to run
 120          * @param $data String: Text to filter, such as JavaScript or CSS text
 121          * @return String: Filtered data
 122          */
 123         protected function filter( $filter, $data ) {
 124                 wfProfileIn( __METHOD__ );
 125
 126                 // For empty/whitespace-only data or for unknown filters, don't perform
 127                 // any caching or processing
 128                 if ( trim( $data ) === ''
 129                         || !in_array( $filter, array( 'minify-js', 'minify-css', 'flip-css' ) ) )
 130                 {
 131                         wfProfileOut( __METHOD__ );
 132                         return $data;
 133                 }
 134
 135                 // Try for cache hit
 136                 // Use CACHE_ANYTHING since filtering is very slow compared to DB queries
 137                 $key = wfMemcKey( 'resourceloader', 'filter', $filter, md5( $data ) );
 138                 $cache = wfGetCache( CACHE_ANYTHING );
 139                 $cacheEntry = $cache->get( $key );
 140                 if ( is_string( $cacheEntry ) ) {
 141                         wfProfileOut( __METHOD__ );
 142                         return $cacheEntry;
 143                 }
 144
 145                 // Run the filter - we've already verified one of these will work
 146                 try {
 147                         switch ( $filter ) {
 148                                 case 'minify-js':
 149                                         $result = JSMin::minify( $data );
 150                                         break;
 151                                 case 'minify-css':
 152                                         $result = CSSMin::minify( $data );
 153                                         break;
 154                                 case 'flip-css':
 155                                         $result = CSSJanus::transform( $data, true, false );
 156                                         break;
 157                         }
 158                 } catch ( Exception $exception ) {
 159                         throw new MWException( 'ResourceLoader filter error. ' .
 160                                 'Exception was thrown: ' . $exception->getMessage() );
 161                 }
 162
 163                 // Save filtered text to Memcached
 164                 $cache->set( $key, $result );
 165
 166                 wfProfileOut( __METHOD__ );
 167
 168                 return $result;
 169         }
 170
 171         /* Methods */
 172
 173         /**
 174          * Registers core modules and runs registration hooks.
 175          */
 176         public function __construct() {
 177                 global $IP, $wgResourceModules;
 178
 179                 wfProfileIn( __METHOD__ );
 180
 181                 // Register core modules
 182                 $this->register( include( "$IP/resources/Resources.php" ) );
 183                 // Register extension modules
 184                 wfRunHooks( 'ResourceLoaderRegisterModules', array( &$this ) );
 185                 $this->register( $wgResourceModules );
 186
 187                 wfProfileOut( __METHOD__ );
 188         }
 189
 190         /**
 191          * Registers a module with the ResourceLoader system.
 192          *
 193          * @param $name Mixed: Name of module as a string or List of name/object pairs as an array
 194          * @param $info Module info array. For backwards compatibility with 1.17alpha,
 195          *   this may also be a ResourceLoaderModule object. Optional when using
 196          *   multiple-registration calling style.
 197          * @throws MWException: If a duplicate module registration is attempted
 198          * @throws MWException: If something other than a ResourceLoaderModule is being registered
 199          * @return Boolean: False if there were any errors, in which case one or more modules were not
 200          *     registered
 201          */
 202         public function register( $name, $info = null ) {
 203                 wfProfileIn( __METHOD__ );
 204
 205                 // Allow multiple modules to be registered in one call
 206                 if ( is_array( $name ) ) {
 207                         foreach ( $name as $key => $value ) {
 208                                 $this->register( $key, $value );
 209                         }
 210                         return;
 211                 }
 212
 213                 // Disallow duplicate registrations
 214                 if ( isset( $this->moduleInfos[$name] ) ) {
 215                         // A module has already been registered by this name
 216                         throw new MWException(
 217                                 'ResourceLoader duplicate registration error. ' .
 218                                 'Another module has already been registered as ' . $name
 219                         );
 220                 }
 221
 222                 // Attach module
 223                 if ( is_object( $info ) ) {
 224                         // Old calling convention
 225                         // Validate the input
 226                         if ( !( $info instanceof ResourceLoaderModule ) ) {
 227                                 throw new MWException( 'ResourceLoader invalid module error. ' .
 228                                         'Instances of ResourceLoaderModule expected.' );
 229                         }
 230
 231                         $this->moduleInfos[$name] = array( 'object' => $info );
 232                         $info->setName( $name );
 233                         $this->modules[$name] = $info;
 234                 } else {
 235                         // New calling convention
 236                         $this->moduleInfos[$name] = $info;
 237                 }
 238
 239                 wfProfileOut( __METHOD__ );
 240         }
 241
 242         /**
 243          * Get a list of module names
 244          *
 245          * @return Array: List of module names
 246          */
 247         public function getModuleNames() {
 248                 return array_keys( $this->moduleInfos );
 249         }
 250
 251         /**
 252          * Get the ResourceLoaderModule object for a given module name.
 253          *
 254          * @param $name String: Module name
 255          * @return Mixed: ResourceLoaderModule if module has been registered, null otherwise
 256          */
 257         public function getModule( $name ) {
 258                 if ( !isset( $this->modules[$name] ) ) {
 259                         if ( !isset( $this->moduleInfos[$name] ) ) {
 260                                 // No such module
 261                                 return null;
 262                         }
 263                         // Construct the requested object
 264                         $info = $this->moduleInfos[$name];
 265                         if ( isset( $info['object'] ) ) {
 266                                 // Object given in info array
 267                                 $object = $info['object'];
 268                         } else {
 269                                 if ( !isset( $info['class'] ) ) {
 270                                         $class = 'ResourceLoaderFileModule';
 271                                 } else {
 272                                         $class = $info['class'];
 273                                 }
 274                                 $object = new $class( $info );
 275                         }
 276                         $object->setName( $name );
 277                         $this->modules[$name] = $object;
 278                 }
 279
 280                 return $this->modules[$name];
 281         }
 282
 283         /**
 284          * Outputs a response to a resource load-request, including a content-type header.
 285          *
 286          * @param $context ResourceLoaderContext: Context in which a response should be formed
 287          */
 288         public function respond( ResourceLoaderContext $context ) {
 289                 global $wgResourceLoaderMaxage, $wgCacheEpoch;
 290
 291                 wfProfileIn( __METHOD__ );
 292
 293                 // Split requested modules into two groups, modules and missing
 294                 $modules = array();
 295                 $missing = array();
 296                 foreach ( $context->getModules() as $name ) {
 297                         if ( isset( $this->moduleInfos[$name] ) ) {
 298                                 $modules[$name] = $this->getModule( $name );
 299                         } else {
 300                                 $missing[] = $name;
 301                         }
 302                 }
 303
 304                 // If a version wasn't specified we need a shorter expiry time for updates
 305                 // to propagate to clients quickly
 306                 if ( is_null( $context->getVersion() ) ) {
 307                         $maxage  = $wgResourceLoaderMaxage['unversioned']['client'];
 308                         $smaxage = $wgResourceLoaderMaxage['unversioned']['server'];
 309                 }
 310                 // If a version was specified we can use a longer expiry time since changing
 311                 // version numbers causes cache misses
 312                 else {
 313                         $maxage  = $wgResourceLoaderMaxage['versioned']['client'];
 314                         $smaxage = $wgResourceLoaderMaxage['versioned']['server'];
 315                 }
 316
 317                 // Preload information needed to the mtime calculation below
 318                 $this->preloadModuleInfo( array_keys( $modules ), $context );
 319
 320                 wfProfileIn( __METHOD__.'-getModifiedTime' );
 321
 322                 // To send Last-Modified and support If-Modified-Since, we need to detect
 323                 // the last modified time
 324                 $mtime = wfTimestamp( TS_UNIX, $wgCacheEpoch );
 325                 foreach ( $modules as $module ) {
 326                         // Bypass squid cache if the request includes any private modules
 327                         if ( $module->getGroup() === 'private' ) {
 328                                 $smaxage = 0;
 329                         }
 330                         // Calculate maximum modified time
 331                         $mtime = max( $mtime, $module->getModifiedTime( $context ) );
 332                 }
 333
 334                 wfProfileOut( __METHOD__.'-getModifiedTime' );
 335
 336                 if ( $context->getOnly() === 'styles' ) {
 337                         header( 'Content-Type: text/css' );
 338                 } else {
 339                         header( 'Content-Type: text/javascript' );
 340                 }
 341                 header( 'Last-Modified: ' . wfTimestamp( TS_RFC2822, $mtime ) );
 342                 if ( $context->getDebug() ) {
 343                         header( 'Cache-Control: must-revalidate' );
 344                 } else {
 345                         header( "Cache-Control: public, max-age=$maxage, s-maxage=$smaxage" );
 346                         header( 'Expires: ' . wfTimestamp( TS_RFC2822, min( $maxage, $smaxage ) + time() ) );
 347                 }
 348
 349                 // If there's an If-Modified-Since header, respond with a 304 appropriately
 350                 // Some clients send "timestamp;length=123". Strip the part after the first ';'
 351                 // so we get a valid timestamp.
 352                 $ims = $context->getRequest()->getHeader( 'If-Modified-Since' );
 353                 if ( $ims !== false ) {
 354                         $imsTS = strtok( $ims, ';' );
 355                         if ( $mtime <= wfTimestamp( TS_UNIX, $imsTS ) ) {
 356                                 header( 'HTTP/1.0 304 Not Modified' );
 357                                 header( 'Status: 304 Not Modified' );
 358                                 wfProfileOut( __METHOD__ );
 359                                 return;
 360                         }
 361                 }
 362
 363                 // Generate a response
 364                 $response = $this->makeModuleResponse( $context, $modules, $missing );
 365
 366                 // Tack on PHP warnings as a comment in debug mode
 367                 if ( $context->getDebug() && strlen( $warnings = ob_get_contents() ) ) {
 368                         $response .= "/*\n$warnings\n*/";
 369                 }
 370
 371                 // Clear any warnings from the buffer
 372                 ob_clean();
 373                 echo $response;
 374
 375                 wfProfileOut( __METHOD__ );
 376         }
 377
 378         /**
 379          * Generates code for a response
 380          *
 381          * @param $context ResourceLoaderContext: Context in which to generate a response
 382          * @param $modules Array: List of module objects keyed by module name
 383          * @param $missing Array: List of unavailable modules (optional)
 384          * @return String: Response data
 385          */
 386         public function makeModuleResponse( ResourceLoaderContext $context,
 387                 array $modules, $missing = array() )
 388         {
 389                 // Pre-fetch blobs
 390                 if ( $context->shouldIncludeMessages() ) {
 391                         $blobs = MessageBlobStore::get( $this, $modules, $context->getLanguage() );
 392                 } else {
 393                         $blobs = array();
 394                 }
 395
 396                 // Generate output
 397                 $out = '';
 398                 foreach ( $modules as $name => $module ) {
 399
 400                         wfProfileIn( __METHOD__ . '-' . $name );
 401
 402                         // Scripts
 403                         $scripts = '';
 404                         if ( $context->shouldIncludeScripts() ) {
 405                                 $scripts .= $module->getScript( $context ) . "\n";
 406                         }
 407
 408                         // Styles
 409                         $styles = array();
 410                         if ( $context->shouldIncludeStyles() ) {
 411                                 $styles = $module->getStyles( $context );
 412                                 // Flip CSS on a per-module basis
 413                                 if ( $styles && $module->getFlip( $context ) ) {
 414                                         foreach ( $styles as $media => $style ) {
 415                                                 $styles[$media] = $this->filter( 'flip-css', $style );
 416                                         }
 417                                 }
 418                         }
 419
 420                         // Messages
 421                         $messagesBlob = isset( $blobs[$name] ) ? $blobs[$name] : '{}';
 422
 423                         // Append output
 424                         switch ( $context->getOnly() ) {
 425                                 case 'scripts':
 426                                         $out .= $scripts;
 427                                         break;
 428                                 case 'styles':
 429                                         $out .= self::makeCombinedStyles( $styles );
 430                                         break;
 431                                 case 'messages':
 432                                         $out .= self::makeMessageSetScript( new XmlJsCode( $messagesBlob ) );
 433                                         break;
 434                                 default:
 435                                         // Minify CSS before embedding in mediaWiki.loader.implement call
 436                                         // (unless in debug mode)
 437                                         if ( !$context->getDebug() ) {
 438                                                 foreach ( $styles as $media => $style ) {
 439                                                         $styles[$media] = $this->filter( 'minify-css', $style );
 440                                                 }
 441                                         }
 442                                         $out .= self::makeLoaderImplementScript( $name, $scripts, $styles,
 443                                                 new XmlJsCode( $messagesBlob ) );
 444                                         break;
 445                         }
 446
 447                         wfProfileOut( __METHOD__ . '-' . $name );
 448                 }
 449
 450                 // Update module states
 451                 if ( $context->shouldIncludeScripts() ) {
 452                         // Set the state of modules loaded as only scripts to ready
 453                         if ( count( $modules ) && $context->getOnly() === 'scripts'
 454                                 && !isset( $modules['startup'] ) )
 455                         {
 456                                 $out .= self::makeLoaderStateScript(
 457                                         array_fill_keys( array_keys( $modules ), 'ready' ) );
 458                         }
 459                         // Set the state of modules which were requested but unavailable as missing
 460                         if ( is_array( $missing ) && count( $missing ) ) {
 461                                 $out .= self::makeLoaderStateScript( array_fill_keys( $missing, 'missing' ) );
 462                         }
 463                 }
 464
 465                 if ( $context->getDebug() ) {
 466                         return $out;
 467                 } else {
 468                         if ( $context->getOnly() === 'styles' ) {
 469                                 return $this->filter( 'minify-css', $out );
 470                         } else {
 471                                 return $this->filter( 'minify-js', $out );
 472                         }
 473                 }
 474         }
 475
 476         /* Static Methods */
 477
 478         /**
 479          * Returns JS code to call to mediaWiki.loader.implement for a module with
 480          * given properties.
 481          *
 482          * @param $name Module name
 483          * @param $scripts Array: List of JavaScript code snippets to be executed after the
 484          *     module is loaded
 485          * @param $styles Array: List of CSS strings keyed by media type
 486          * @param $messages Mixed: List of messages associated with this module. May either be an
 487          *     associative array mapping message key to value, or a JSON-encoded message blob containing
 488          *     the same data, wrapped in an XmlJsCode object.
 489          */
 490         public static function makeLoaderImplementScript( $name, $scripts, $styles, $messages ) {
 491                 if ( is_array( $scripts ) ) {
 492                         $scripts = implode( $scripts, "\n" );
 493                 }
 494                 return Xml::encodeJsCall(
 495                         'mediaWiki.loader.implement',
 496                         array(
 497                                 $name,
 498                                 new XmlJsCode( "function() {{$scripts}}" ),
 499                                 (object)$styles,
 500                                 (object)$messages
 501                         ) );
 502         }
 503
 504         /**
 505          * Returns JS code which, when called, will register a given list of messages.
 506          *
 507          * @param $messages Mixed: Either an associative array mapping message key to value, or a
 508          *     JSON-encoded message blob containing the same data, wrapped in an XmlJsCode object.
 509          */
 510         public static function makeMessageSetScript( $messages ) {
 511                 return Xml::encodeJsCall( 'mediaWiki.messages.set', array( (object)$messages ) );
 512         }
 513
 514         /**
 515          * Combines an associative array mapping media type to CSS into a
 516          * single stylesheet with @media blocks.
 517          *
 518          * @param $styles Array: List of CSS strings keyed by media type
 519          */
 520         public static function makeCombinedStyles( array $styles ) {
 521                 $out = '';
 522                 foreach ( $styles as $media => $style ) {
 523                         $out .= "@media $media {\n" . str_replace( "\n", "\n\t", "\t" . $style ) . "\n}\n";
 524                 }
 525                 return $out;
 526         }
 527
 528         /**
 529          * Returns a JS call to mediaWiki.loader.state, which sets the state of a
 530          * module or modules to a given value. Has two calling conventions:
 531          *
 532          *    - ResourceLoader::makeLoaderStateScript( $name, $state ):
 533          *         Set the state of a single module called $name to $state
 534          *
 535          *    - ResourceLoader::makeLoaderStateScript( array( $name => $state, ... ) ):
 536          *         Set the state of modules with the given names to the given states
 537          */
 538         public static function makeLoaderStateScript( $name, $state = null ) {
 539                 if ( is_array( $name ) ) {
 540                         return Xml::encodeJsCall( 'mediaWiki.loader.state', array( $name ) );
 541                 } else {
 542                         return Xml::encodeJsCall( 'mediaWiki.loader.state', array( $name, $state ) );
 543                 }
 544         }
 545
 546         /**
 547          * Returns JS code which calls the script given by $script. The script will
 548          * be called with local variables name, version, dependencies and group,
 549          * which will have values corresponding to $name, $version, $dependencies
 550          * and $group as supplied.
 551          *
 552          * @param $name String: Module name
 553          * @param $version Integer: Module version number as a timestamp
 554          * @param $dependencies Array: List of module names on which this module depends
 555          * @param $group String: Group which the module is in.
 556          * @param $script String: JavaScript code
 557          */
 558         public static function makeCustomLoaderScript( $name, $version, $dependencies, $group, $script ) {
 559                 $script = str_replace( "\n", "\n\t", trim( $script ) );
 560                 return Xml::encodeJsCall(
 561                         "( function( name, version, dependencies, group ) {\n\t$script\n} )",
 562                         array( $name, $version, $dependencies, $group ) );
 563         }
 564
 565         /**
 566          * Returns JS code which calls mediaWiki.loader.register with the given
 567          * parameters. Has three calling conventions:
 568          *
 569          *   - ResourceLoader::makeLoaderRegisterScript( $name, $version, $dependencies, $group ):
 570          *       Register a single module.
 571          *
 572          *   - ResourceLoader::makeLoaderRegisterScript( array( $name1, $name2 ) ):
 573          *       Register modules with the given names.
 574          *
 575          *   - ResourceLoader::makeLoaderRegisterScript( array(
 576          *        array( $name1, $version1, $dependencies1, $group1 ),
 577          *        array( $name2, $version2, $dependencies1, $group2 ),
 578          *        ...
 579          *     ) ):
 580          *        Registers modules with the given names and parameters.
 581          *
 582          * @param $name String: Module name
 583          * @param $version Integer: Module version number as a timestamp
 584          * @param $dependencies Array: List of module names on which this module depends
 585          * @param $group String: group which the module is in.
 586          */
 587         public static function makeLoaderRegisterScript( $name, $version = null,
 588                 $dependencies = null, $group = null )
 589         {
 590                 if ( is_array( $name ) ) {
 591                         return Xml::encodeJsCall( 'mediaWiki.loader.register', array( $name ) );
 592                 } else {
 593                         $version = (int) $version > 1 ? (int) $version : 1;
 594                         return Xml::encodeJsCall( 'mediaWiki.loader.register',
 595                                 array( $name, $version, $dependencies, $group ) );
 596                 }
 597         }
 598
 599         /**
 600          * Returns JS code which runs given JS code if the client-side framework is
 601          * present.
 602          *
 603          * @param $script String: JavaScript code
 604          */
 605         public static function makeLoaderConditionalScript( $script ) {
 606                 $script = str_replace( "\n", "\n\t", trim( $script ) );
 607                 return "if ( window.mediaWiki ) {\n\t$script\n}\n";
 608         }
 609
 610         /**
 611          * Returns JS code which will set the MediaWiki configuration array to
 612          * the given value.
 613          *
 614          * @param $configuration Array: List of configuration values keyed by variable name
 615          */
 616         public static function makeConfigSetScript( array $configuration ) {
 617                 return Xml::encodeJsCall( 'mediaWiki.config.set', array( $configuration ) );
 618         }
 619
 620         /**
 621          * Determine whether debug mode was requested
 622          * Order of priority is 1) request param, 2) cookie, 3) $wg setting
 623          * @return bool
 624          */
 625         public static function inDebugMode() {
 626                 global $wgRequest, $wgResourceLoaderDebug;
 627                 static $retval = null;
 628                 if ( !is_null( $retval ) )
 629                         return $retval;
 630                 return $retval = $wgRequest->getFuzzyBool( 'debug',
 631                         $wgRequest->getCookie( 'resourceLoaderDebug', '', $wgResourceLoaderDebug ) );
 632         }
 633 }