includes/resourceloader/ResourceLoaderFileModule.php

   1 <?php
   2 /**
   3  * ResourceLoader module based on local JavaScript/CSS files.
   4  *
   5  * This program 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 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program 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 along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @author Trevor Parscal
  22  * @author Roan Kattouw
  23  */
  24
  25 /**
  26  * ResourceLoader module based on local JavaScript/CSS files.
  27  */
  28 class ResourceLoaderFileModule extends ResourceLoaderModule {
  29
  30         /** @var string Local base path, see __construct() */
  31         protected $localBasePath = '';
  32
  33         /** @var string Remote base path, see __construct() */
  34         protected $remoteBasePath = '';
  35
  36         /** @var array Saves a list of the templates named by the modules. */
  37         protected $templates = [];
  38
  39         /**
  40          * @var array List of paths to JavaScript files to always include
  41          * @par Usage:
  42          * @code
  43          * [ [file-path], [file-path], ... ]
  44          * @endcode
  45          */
  46         protected $scripts = [];
  47
  48         /**
  49          * @var array List of JavaScript files to include when using a specific language
  50          * @par Usage:
  51          * @code
  52          * [ [language-code] => [ [file-path], [file-path], ... ], ... ]
  53          * @endcode
  54          */
  55         protected $languageScripts = [];
  56
  57         /**
  58          * @var array List of JavaScript files to include when using a specific skin
  59          * @par Usage:
  60          * @code
  61          * [ [skin-name] => [ [file-path], [file-path], ... ], ... ]
  62          * @endcode
  63          */
  64         protected $skinScripts = [];
  65
  66         /**
  67          * @var array List of paths to JavaScript files to include in debug mode
  68          * @par Usage:
  69          * @code
  70          * [ [skin-name] => [ [file-path], [file-path], ... ], ... ]
  71          * @endcode
  72          */
  73         protected $debugScripts = [];
  74
  75         /**
  76          * @var array List of paths to CSS files to always include
  77          * @par Usage:
  78          * @code
  79          * [ [file-path], [file-path], ... ]
  80          * @endcode
  81          */
  82         protected $styles = [];
  83
  84         /**
  85          * @var array List of paths to CSS files to include when using specific skins
  86          * @par Usage:
  87          * @code
  88          * [ [file-path], [file-path], ... ]
  89          * @endcode
  90          */
  91         protected $skinStyles = [];
  92
  93         /**
  94          * @var array List of modules this module depends on
  95          * @par Usage:
  96          * @code
  97          * [ [file-path], [file-path], ... ]
  98          * @endcode
  99          */
 100         protected $dependencies = [];
 101
 102         /**
 103          * @var string File name containing the body of the skip function
 104          */
 105         protected $skipFunction = null;
 106
 107         /**
 108          * @var array List of message keys used by this module
 109          * @par Usage:
 110          * @code
 111          * [ [message-key], [message-key], ... ]
 112          * @endcode
 113          */
 114         protected $messages = [];
 115
 116         /** @var string Name of group to load this module in */
 117         protected $group;
 118
 119         /** @var bool Link to raw files in debug mode */
 120         protected $debugRaw = true;
 121
 122         /** @var bool Whether mw.loader.state() call should be omitted */
 123         protected $raw = false;
 124
 125         protected $targets = [ 'desktop' ];
 126
 127         /** @var bool Whether CSSJanus flipping should be skipped for this module */
 128         protected $noflip = false;
 129
 130         /**
 131          * @var bool Whether getStyleURLsForDebug should return raw file paths,
 132          * or return load.php urls
 133          */
 134         protected $hasGeneratedStyles = false;
 135
 136         /**
 137          * @var array Place where readStyleFile() tracks file dependencies
 138          * @par Usage:
 139          * @code
 140          * [ [file-path], [file-path], ... ]
 141          * @endcode
 142          */
 143         protected $localFileRefs = [];
 144
 145         /**
 146          * @var array Place where readStyleFile() tracks file dependencies for non-existent files.
 147          * Used in tests to detect missing dependencies.
 148          */
 149         protected $missingLocalFileRefs = [];
 150
 151         /**
 152          * Constructs a new module from an options array.
 153          *
 154          * @param array $options List of options; if not given or empty, an empty module will be
 155          *     constructed
 156          * @param string $localBasePath Base path to prepend to all local paths in $options. Defaults
 157          *     to $IP
 158          * @param string $remoteBasePath Base path to prepend to all remote paths in $options. Defaults
 159          *     to $wgResourceBasePath
 160          *
 161          * Below is a description for the $options array:
 162          * @throws InvalidArgumentException
 163          * @par Construction options:
 164          * @code
 165          *     [
 166          *         // Base path to prepend to all local paths in $options. Defaults to $IP
 167          *         'localBasePath' => [base path],
 168          *         // Base path to prepend to all remote paths in $options. Defaults to $wgResourceBasePath
 169          *         'remoteBasePath' => [base path],
 170          *         // Equivalent of remoteBasePath, but relative to $wgExtensionAssetsPath
 171          *         'remoteExtPath' => [base path],
 172          *         // Equivalent of remoteBasePath, but relative to $wgStylePath
 173          *         'remoteSkinPath' => [base path],
 174          *         // Scripts to always include
 175          *         'scripts' => [file path string or array of file path strings],
 176          *         // Scripts to include in specific language contexts
 177          *         'languageScripts' => [
 178          *             [language code] => [file path string or array of file path strings],
 179          *         ],
 180          *         // Scripts to include in specific skin contexts
 181          *         'skinScripts' => [
 182          *             [skin name] => [file path string or array of file path strings],
 183          *         ],
 184          *         // Scripts to include in debug contexts
 185          *         'debugScripts' => [file path string or array of file path strings],
 186          *         // Modules which must be loaded before this module
 187          *         'dependencies' => [module name string or array of module name strings],
 188          *         'templates' => [
 189          *             [template alias with file.ext] => [file path to a template file],
 190          *         ],
 191          *         // Styles to always load
 192          *         'styles' => [file path string or array of file path strings],
 193          *         // Styles to include in specific skin contexts
 194          *         'skinStyles' => [
 195          *             [skin name] => [file path string or array of file path strings],
 196          *         ],
 197          *         // Messages to always load
 198          *         'messages' => [array of message key strings],
 199          *         // Group which this module should be loaded together with
 200          *         'group' => [group name string],
 201          *         // Function that, if it returns true, makes the loader skip this module.
 202          *         // The file must contain valid JavaScript for execution in a private function.
 203          *         // The file must not contain the "function () {" and "}" wrapper though.
 204          *         'skipFunction' => [file path]
 205          *     ]
 206          * @endcode
 207          */
 208         public function __construct(
 209                 $options = [],
 210                 $localBasePath = null,
 211                 $remoteBasePath = null
 212         ) {
 213                 // Flag to decide whether to automagically add the mediawiki.template module
 214                 $hasTemplates = false;
 215                 // localBasePath and remoteBasePath both have unbelievably long fallback chains
 216                 // and need to be handled separately.
 217                 list( $this->localBasePath, $this->remoteBasePath ) =
 218                         self::extractBasePaths( $options, $localBasePath, $remoteBasePath );
 219
 220                 // Extract, validate and normalise remaining options
 221                 foreach ( $options as $member => $option ) {
 222                         switch ( $member ) {
 223                                 // Lists of file paths
 224                                 case 'scripts':
 225                                 case 'debugScripts':
 226                                 case 'styles':
 227                                         $this->{$member} = (array)$option;
 228                                         break;
 229                                 case 'templates':
 230                                         $hasTemplates = true;
 231                                         $this->{$member} = (array)$option;
 232                                         break;
 233                                 // Collated lists of file paths
 234                                 case 'languageScripts':
 235                                 case 'skinScripts':
 236                                 case 'skinStyles':
 237                                         if ( !is_array( $option ) ) {
 238                                                 throw new InvalidArgumentException(
 239                                                         "Invalid collated file path list error. " .
 240                                                         "'$option' given, array expected."
 241                                                 );
 242                                         }
 243                                         foreach ( $option as $key => $value ) {
 244                                                 if ( !is_string( $key ) ) {
 245                                                         throw new InvalidArgumentException(
 246                                                                 "Invalid collated file path list key error. " .
 247                                                                 "'$key' given, string expected."
 248                                                         );
 249                                                 }
 250                                                 $this->{$member}[$key] = (array)$value;
 251                                         }
 252                                         break;
 253                                 case 'deprecated':
 254                                         $this->deprecated = $option;
 255                                         break;
 256                                 // Lists of strings
 257                                 case 'dependencies':
 258                                 case 'messages':
 259                                 case 'targets':
 260                                         // Normalise
 261                                         $option = array_values( array_unique( (array)$option ) );
 262                                         sort( $option );
 263
 264                                         $this->{$member} = $option;
 265                                         break;
 266                                 // Single strings
 267                                 case 'group':
 268                                 case 'skipFunction':
 269                                         $this->{$member} = (string)$option;
 270                                         break;
 271                                 // Single booleans
 272                                 case 'debugRaw':
 273                                 case 'raw':
 274                                 case 'noflip':
 275                                         $this->{$member} = (bool)$option;
 276                                         break;
 277                         }
 278                 }
 279                 if ( $hasTemplates ) {
 280                         $this->dependencies[] = 'mediawiki.template';
 281                         // Ensure relevant template compiler module gets loaded
 282                         foreach ( $this->templates as $alias => $templatePath ) {
 283                                 if ( is_int( $alias ) ) {
 284                                         $alias = $templatePath;
 285                                 }
 286                                 $suffix = explode( '.', $alias );
 287                                 $suffix = end( $suffix );
 288                                 $compilerModule = 'mediawiki.template.' . $suffix;
 289                                 if ( $suffix !== 'html' && !in_array( $compilerModule, $this->dependencies ) ) {
 290                                         $this->dependencies[] = $compilerModule;
 291                                 }
 292                         }
 293                 }
 294         }
 295
 296         /**
 297          * Extract a pair of local and remote base paths from module definition information.
 298          * Implementation note: the amount of global state used in this function is staggering.
 299          *
 300          * @param array $options Module definition
 301          * @param string $localBasePath Path to use if not provided in module definition. Defaults
 302          *     to $IP
 303          * @param string $remoteBasePath Path to use if not provided in module definition. Defaults
 304          *     to $wgResourceBasePath
 305          * @return array Array( localBasePath, remoteBasePath )
 306          */
 307         public static function extractBasePaths(
 308                 $options = [],
 309                 $localBasePath = null,
 310                 $remoteBasePath = null
 311         ) {
 312                 global $IP, $wgResourceBasePath;
 313
 314                 // The different ways these checks are done, and their ordering, look very silly,
 315                 // but were preserved for backwards-compatibility just in case. Tread lightly.
 316
 317                 if ( $localBasePath === null ) {
 318                         $localBasePath = $IP;
 319                 }
 320                 if ( $remoteBasePath === null ) {
 321                         $remoteBasePath = $wgResourceBasePath;
 322                 }
 323
 324                 if ( isset( $options['remoteExtPath'] ) ) {
 325                         global $wgExtensionAssetsPath;
 326                         $remoteBasePath = $wgExtensionAssetsPath . '/' . $options['remoteExtPath'];
 327                 }
 328
 329                 if ( isset( $options['remoteSkinPath'] ) ) {
 330                         global $wgStylePath;
 331                         $remoteBasePath = $wgStylePath . '/' . $options['remoteSkinPath'];
 332                 }
 333
 334                 if ( array_key_exists( 'localBasePath', $options ) ) {
 335                         $localBasePath = (string)$options['localBasePath'];
 336                 }
 337
 338                 if ( array_key_exists( 'remoteBasePath', $options ) ) {
 339                         $remoteBasePath = (string)$options['remoteBasePath'];
 340                 }
 341
 342                 return [ $localBasePath, $remoteBasePath ];
 343         }
 344
 345         /**
 346          * Gets all scripts for a given context concatenated together.
 347          *
 348          * @param ResourceLoaderContext $context Context in which to generate script
 349          * @return string JavaScript code for $context
 350          */
 351         public function getScript( ResourceLoaderContext $context ) {
 352                 $files = $this->getScriptFiles( $context );
 353                 return $this->getDeprecationInformation() . $this->readScriptFiles( $files );
 354         }
 355
 356         /**
 357          * @param ResourceLoaderContext $context
 358          * @return array
 359          */
 360         public function getScriptURLsForDebug( ResourceLoaderContext $context ) {
 361                 $urls = [];
 362                 foreach ( $this->getScriptFiles( $context ) as $file ) {
 363                         $urls[] = OutputPage::transformResourcePath(
 364                                 $this->getConfig(),
 365                                 $this->getRemotePath( $file )
 366                         );
 367                 }
 368                 return $urls;
 369         }
 370
 371         /**
 372          * @return bool
 373          */
 374         public function supportsURLLoading() {
 375                 return $this->debugRaw;
 376         }
 377
 378         /**
 379          * Get all styles for a given context.
 380          *
 381          * @param ResourceLoaderContext $context
 382          * @return array CSS code for $context as an associative array mapping media type to CSS text.
 383          */
 384         public function getStyles( ResourceLoaderContext $context ) {
 385                 $styles = $this->readStyleFiles(
 386                         $this->getStyleFiles( $context ),
 387                         $this->getFlip( $context ),
 388                         $context
 389                 );
 390                 // Collect referenced files
 391                 $this->saveFileDependencies( $context, $this->localFileRefs );
 392
 393                 return $styles;
 394         }
 395
 396         /**
 397          * @param ResourceLoaderContext $context
 398          * @return array
 399          */
 400         public function getStyleURLsForDebug( ResourceLoaderContext $context ) {
 401                 if ( $this->hasGeneratedStyles ) {
 402                         // Do the default behaviour of returning a url back to load.php
 403                         // but with only=styles.
 404                         return parent::getStyleURLsForDebug( $context );
 405                 }
 406                 // Our module consists entirely of real css files,
 407                 // in debug mode we can load those directly.
 408                 $urls = [];
 409                 foreach ( $this->getStyleFiles( $context ) as $mediaType => $list ) {
 410                         $urls[$mediaType] = [];
 411                         foreach ( $list as $file ) {
 412                                 $urls[$mediaType][] = OutputPage::transformResourcePath(
 413                                         $this->getConfig(),
 414                                         $this->getRemotePath( $file )
 415                                 );
 416                         }
 417                 }
 418                 return $urls;
 419         }
 420
 421         /**
 422          * Gets list of message keys used by this module.
 423          *
 424          * @return array List of message keys
 425          */
 426         public function getMessages() {
 427                 return $this->messages;
 428         }
 429
 430         /**
 431          * Gets the name of the group this module should be loaded in.
 432          *
 433          * @return string Group name
 434          */
 435         public function getGroup() {
 436                 return $this->group;
 437         }
 438
 439         /**
 440          * Gets list of names of modules this module depends on.
 441          * @param ResourceLoaderContext|null $context
 442          * @return array List of module names
 443          */
 444         public function getDependencies( ResourceLoaderContext $context = null ) {
 445                 return $this->dependencies;
 446         }
 447
 448         /**
 449          * Get the skip function.
 450          * @return null|string
 451          * @throws MWException
 452          */
 453         public function getSkipFunction() {
 454                 if ( !$this->skipFunction ) {
 455                         return null;
 456                 }
 457
 458                 $localPath = $this->getLocalPath( $this->skipFunction );
 459                 if ( !file_exists( $localPath ) ) {
 460                         throw new MWException( __METHOD__ . ": skip function file not found: \"$localPath\"" );
 461                 }
 462                 $contents = $this->stripBom( file_get_contents( $localPath ) );
 463                 if ( $this->getConfig()->get( 'ResourceLoaderValidateStaticJS' ) ) {
 464                         $contents = $this->validateScriptFile( $localPath, $contents );
 465                 }
 466                 return $contents;
 467         }
 468
 469         /**
 470          * @return bool
 471          */
 472         public function isRaw() {
 473                 return $this->raw;
 474         }
 475
 476         /**
 477          * Disable module content versioning.
 478          *
 479          * This class uses getDefinitionSummary() instead, to avoid filesystem overhead
 480          * involved with building the full module content inside a startup request.
 481          *
 482          * @return bool
 483          */
 484         public function enableModuleContentVersion() {
 485                 return false;
 486         }
 487
 488         /**
 489          * Helper method to gather file hashes for getDefinitionSummary.
 490          *
 491          * This function is context-sensitive, only computing hashes of files relevant to the
 492          * given language, skin, etc.
 493          *
 494          * @see ResourceLoaderModule::getFileDependencies
 495          * @param ResourceLoaderContext $context
 496          * @return array
 497          */
 498         protected function getFileHashes( ResourceLoaderContext $context ) {
 499                 $files = [];
 500
 501                 // Flatten style files into $files
 502                 $styles = self::collateFilePathListByOption( $this->styles, 'media', 'all' );
 503                 foreach ( $styles as $styleFiles ) {
 504                         $files = array_merge( $files, $styleFiles );
 505                 }
 506
 507                 $skinFiles = self::collateFilePathListByOption(
 508                         self::tryForKey( $this->skinStyles, $context->getSkin(), 'default' ),
 509                         'media',
 510                         'all'
 511                 );
 512                 foreach ( $skinFiles as $styleFiles ) {
 513                         $files = array_merge( $files, $styleFiles );
 514                 }
 515
 516                 // Final merge, this should result in a master list of dependent files
 517                 $files = array_merge(
 518                         $files,
 519                         $this->scripts,
 520                         $this->templates,
 521                         $context->getDebug() ? $this->debugScripts : [],
 522                         $this->getLanguageScripts( $context->getLanguage() ),
 523                         self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' )
 524                 );
 525                 if ( $this->skipFunction ) {
 526                         $files[] = $this->skipFunction;
 527                 }
 528                 $files = array_map( [ $this, 'getLocalPath' ], $files );
 529                 // File deps need to be treated separately because they're already prefixed
 530                 $files = array_merge( $files, $this->getFileDependencies( $context ) );
 531                 // Filter out any duplicates from getFileDependencies() and others.
 532                 // Most commonly introduced by compileLessFile(), which always includes the
 533                 // entry point Less file we already know about.
 534                 $files = array_values( array_unique( $files ) );
 535
 536                 // Don't include keys or file paths here, only the hashes. Including that would needlessly
 537                 // cause global cache invalidation when files move or if e.g. the MediaWiki path changes.
 538                 // Any significant ordering is already detected by the definition summary.
 539                 return array_map( [ __CLASS__, 'safeFileHash' ], $files );
 540         }
 541
 542         /**
 543          * Get the definition summary for this module.
 544          *
 545          * @param ResourceLoaderContext $context
 546          * @return array
 547          */
 548         public function getDefinitionSummary( ResourceLoaderContext $context ) {
 549                 $summary = parent::getDefinitionSummary( $context );
 550
 551                 $options = [];
 552                 foreach ( [
 553                         // The following properties are omitted because they don't affect the module reponse:
 554                         // - localBasePath (Per T104950; Changes when absolute directory name changes. If
 555                         //    this affects 'scripts' and other file paths, getFileHashes accounts for that.)
 556                         // - remoteBasePath (Per T104950)
 557                         // - dependencies (provided via startup module)
 558                         // - targets
 559                         // - group (provided via startup module)
 560                         'scripts',
 561                         'debugScripts',
 562                         'styles',
 563                         'languageScripts',
 564                         'skinScripts',
 565                         'skinStyles',
 566                         'messages',
 567                         'templates',
 568                         'skipFunction',
 569                         'debugRaw',
 570                         'raw',
 571                 ] as $member ) {
 572                         $options[$member] = $this->{$member};
 573                 };
 574
 575                 $summary[] = [
 576                         'options' => $options,
 577                         'fileHashes' => $this->getFileHashes( $context ),
 578                         'messageBlob' => $this->getMessageBlob( $context ),
 579                 ];
 580
 581                 $lessVars = $this->getLessVars( $context );
 582                 if ( $lessVars ) {
 583                         $summary[] = [ 'lessVars' => $lessVars ];
 584                 }
 585
 586                 return $summary;
 587         }
 588
 589         /**
 590          * @param string|ResourceLoaderFilePath $path
 591          * @return string
 592          */
 593         protected function getLocalPath( $path ) {
 594                 if ( $path instanceof ResourceLoaderFilePath ) {
 595                         return $path->getLocalPath();
 596                 }
 597
 598                 return "{$this->localBasePath}/$path";
 599         }
 600
 601         /**
 602          * @param string|ResourceLoaderFilePath $path
 603          * @return string
 604          */
 605         protected function getRemotePath( $path ) {
 606                 if ( $path instanceof ResourceLoaderFilePath ) {
 607                         return $path->getRemotePath();
 608                 }
 609
 610                 return "{$this->remoteBasePath}/$path";
 611         }
 612
 613         /**
 614          * Infer the stylesheet language from a stylesheet file path.
 615          *
 616          * @since 1.22
 617          * @param string $path
 618          * @return string The stylesheet language name
 619          */
 620         public function getStyleSheetLang( $path ) {
 621                 return preg_match( '/\.less$/i', $path ) ? 'less' : 'css';
 622         }
 623
 624         /**
 625          * Collates file paths by option (where provided).
 626          *
 627          * @param array $list List of file paths in any combination of index/path
 628          *     or path/options pairs
 629          * @param string $option Option name
 630          * @param mixed $default Default value if the option isn't set
 631          * @return array List of file paths, collated by $option
 632          */
 633         protected static function collateFilePathListByOption( array $list, $option, $default ) {
 634                 $collatedFiles = [];
 635                 foreach ( (array)$list as $key => $value ) {
 636                         if ( is_int( $key ) ) {
 637                                 // File name as the value
 638                                 if ( !isset( $collatedFiles[$default] ) ) {
 639                                         $collatedFiles[$default] = [];
 640                                 }
 641                                 $collatedFiles[$default][] = $value;
 642                         } elseif ( is_array( $value ) ) {
 643                                 // File name as the key, options array as the value
 644                                 $optionValue = isset( $value[$option] ) ? $value[$option] : $default;
 645                                 if ( !isset( $collatedFiles[$optionValue] ) ) {
 646                                         $collatedFiles[$optionValue] = [];
 647                                 }
 648                                 $collatedFiles[$optionValue][] = $key;
 649                         }
 650                 }
 651                 return $collatedFiles;
 652         }
 653
 654         /**
 655          * Get a list of element that match a key, optionally using a fallback key.
 656          *
 657          * @param array $list List of lists to select from
 658          * @param string $key Key to look for in $map
 659          * @param string $fallback Key to look for in $list if $key doesn't exist
 660          * @return array List of elements from $map which matched $key or $fallback,
 661          *  or an empty list in case of no match
 662          */
 663         protected static function tryForKey( array $list, $key, $fallback = null ) {
 664                 if ( isset( $list[$key] ) && is_array( $list[$key] ) ) {
 665                         return $list[$key];
 666                 } elseif ( is_string( $fallback )
 667                         && isset( $list[$fallback] )
 668                         && is_array( $list[$fallback] )
 669                 ) {
 670                         return $list[$fallback];
 671                 }
 672                 return [];
 673         }
 674
 675         /**
 676          * Get a list of file paths for all scripts in this module, in order of proper execution.
 677          *
 678          * @param ResourceLoaderContext $context
 679          * @return array List of file paths
 680          */
 681         protected function getScriptFiles( ResourceLoaderContext $context ) {
 682                 $files = array_merge(
 683                         $this->scripts,
 684                         $this->getLanguageScripts( $context->getLanguage() ),
 685                         self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' )
 686                 );
 687                 if ( $context->getDebug() ) {
 688                         $files = array_merge( $files, $this->debugScripts );
 689                 }
 690
 691                 return array_unique( $files, SORT_REGULAR );
 692         }
 693
 694         /**
 695          * Get the set of language scripts for the given language,
 696          * possibly using a fallback language.
 697          *
 698          * @param string $lang
 699          * @return array
 700          */
 701         private function getLanguageScripts( $lang ) {
 702                 $scripts = self::tryForKey( $this->languageScripts, $lang );
 703                 if ( $scripts ) {
 704                         return $scripts;
 705                 }
 706                 $fallbacks = Language::getFallbacksFor( $lang );
 707                 foreach ( $fallbacks as $lang ) {
 708                         $scripts = self::tryForKey( $this->languageScripts, $lang );
 709                         if ( $scripts ) {
 710                                 return $scripts;
 711                         }
 712                 }
 713
 714                 return [];
 715         }
 716
 717         /**
 718          * Get a list of file paths for all styles in this module, in order of proper inclusion.
 719          *
 720          * @param ResourceLoaderContext $context
 721          * @return array List of file paths
 722          */
 723         public function getStyleFiles( ResourceLoaderContext $context ) {
 724                 return array_merge_recursive(
 725                         self::collateFilePathListByOption( $this->styles, 'media', 'all' ),
 726                         self::collateFilePathListByOption(
 727                                 self::tryForKey( $this->skinStyles, $context->getSkin(), 'default' ),
 728                                 'media',
 729                                 'all'
 730                         )
 731                 );
 732         }
 733
 734         /**
 735          * Gets a list of file paths for all skin styles in the module used by
 736          * the skin.
 737          *
 738          * @param string $skinName The name of the skin
 739          * @return array A list of file paths collated by media type
 740          */
 741         protected function getSkinStyleFiles( $skinName ) {
 742                 return self::collateFilePathListByOption(
 743                         self::tryForKey( $this->skinStyles, $skinName ),
 744                         'media',
 745                         'all'
 746                 );
 747         }
 748
 749         /**
 750          * Gets a list of file paths for all skin style files in the module,
 751          * for all available skins.
 752          *
 753          * @return array A list of file paths collated by media type
 754          */
 755         protected function getAllSkinStyleFiles() {
 756                 $styleFiles = [];
 757                 $internalSkinNames = array_keys( Skin::getSkinNames() );
 758                 $internalSkinNames[] = 'default';
 759
 760                 foreach ( $internalSkinNames as $internalSkinName ) {
 761                         $styleFiles = array_merge_recursive(
 762                                 $styleFiles,
 763                                 $this->getSkinStyleFiles( $internalSkinName )
 764                         );
 765                 }
 766
 767                 return $styleFiles;
 768         }
 769
 770         /**
 771          * Returns all style files and all skin style files used by this module.
 772          *
 773          * @return array
 774          */
 775         public function getAllStyleFiles() {
 776                 $collatedStyleFiles = array_merge_recursive(
 777                         self::collateFilePathListByOption( $this->styles, 'media', 'all' ),
 778                         $this->getAllSkinStyleFiles()
 779                 );
 780
 781                 $result = [];
 782
 783                 foreach ( $collatedStyleFiles as $media => $styleFiles ) {
 784                         foreach ( $styleFiles as $styleFile ) {
 785                                 $result[] = $this->getLocalPath( $styleFile );
 786                         }
 787                 }
 788
 789                 return $result;
 790         }
 791
 792         /**
 793          * Gets the contents of a list of JavaScript files.
 794          *
 795          * @param array $scripts List of file paths to scripts to read, remap and concetenate
 796          * @throws MWException
 797          * @return string Concatenated and remapped JavaScript data from $scripts
 798          */
 799         protected function readScriptFiles( array $scripts ) {
 800                 if ( empty( $scripts ) ) {
 801                         return '';
 802                 }
 803                 $js = '';
 804                 foreach ( array_unique( $scripts, SORT_REGULAR ) as $fileName ) {
 805                         $localPath = $this->getLocalPath( $fileName );
 806                         if ( !file_exists( $localPath ) ) {
 807                                 throw new MWException( __METHOD__ . ": script file not found: \"$localPath\"" );
 808                         }
 809                         $contents = $this->stripBom( file_get_contents( $localPath ) );
 810                         if ( $this->getConfig()->get( 'ResourceLoaderValidateStaticJS' ) ) {
 811                                 // Static files don't really need to be checked as often; unlike
 812                                 // on-wiki module they shouldn't change unexpectedly without
 813                                 // admin interference.
 814                                 $contents = $this->validateScriptFile( $fileName, $contents );
 815                         }
 816                         $js .= $contents . "\n";
 817                 }
 818                 return $js;
 819         }
 820
 821         /**
 822          * Gets the contents of a list of CSS files.
 823          *
 824          * @param array $styles List of media type/list of file paths pairs, to read, remap and
 825          * concetenate
 826          * @param bool $flip
 827          * @param ResourceLoaderContext $context
 828          *
 829          * @throws MWException
 830          * @return array List of concatenated and remapped CSS data from $styles,
 831          *     keyed by media type
 832          *
 833          * @since 1.27 Calling this method without a ResourceLoaderContext instance
 834          *   is deprecated.
 835          */
 836         public function readStyleFiles( array $styles, $flip, $context = null ) {
 837                 if ( $context === null ) {
 838                         wfDeprecated( __METHOD__ . ' without a ResourceLoader context', '1.27' );
 839                         $context = ResourceLoaderContext::newDummyContext();
 840                 }
 841
 842                 if ( empty( $styles ) ) {
 843                         return [];
 844                 }
 845                 foreach ( $styles as $media => $files ) {
 846                         $uniqueFiles = array_unique( $files, SORT_REGULAR );
 847                         $styleFiles = [];
 848                         foreach ( $uniqueFiles as $file ) {
 849                                 $styleFiles[] = $this->readStyleFile( $file, $flip, $context );
 850                         }
 851                         $styles[$media] = implode( "\n", $styleFiles );
 852                 }
 853                 return $styles;
 854         }
 855
 856         /**
 857          * Reads a style file.
 858          *
 859          * This method can be used as a callback for array_map()
 860          *
 861          * @param string $path File path of style file to read
 862          * @param bool $flip
 863          * @param ResourceLoaderContext $context
 864          *
 865          * @return string CSS data in script file
 866          * @throws MWException If the file doesn't exist
 867          */
 868         protected function readStyleFile( $path, $flip, $context ) {
 869                 $localPath = $this->getLocalPath( $path );
 870                 $remotePath = $this->getRemotePath( $path );
 871                 if ( !file_exists( $localPath ) ) {
 872                         $msg = __METHOD__ . ": style file not found: \"$localPath\"";
 873                         wfDebugLog( 'resourceloader', $msg );
 874                         throw new MWException( $msg );
 875                 }
 876
 877                 if ( $this->getStyleSheetLang( $localPath ) === 'less' ) {
 878                         $style = $this->compileLessFile( $localPath, $context );
 879                         $this->hasGeneratedStyles = true;
 880                 } else {
 881                         $style = $this->stripBom( file_get_contents( $localPath ) );
 882                 }
 883
 884                 if ( $flip ) {
 885                         $style = CSSJanus::transform( $style, true, false );
 886                 }
 887                 $localDir = dirname( $localPath );
 888                 $remoteDir = dirname( $remotePath );
 889                 // Get and register local file references
 890                 $localFileRefs = CSSMin::getLocalFileReferences( $style, $localDir );
 891                 foreach ( $localFileRefs as $file ) {
 892                         if ( file_exists( $file ) ) {
 893                                 $this->localFileRefs[] = $file;
 894                         } else {
 895                                 $this->missingLocalFileRefs[] = $file;
 896                         }
 897                 }
 898                 // Don't cache this call. remap() ensures data URIs embeds are up to date,
 899                 // and urls contain correct content hashes in their query string. (T128668)
 900                 return CSSMin::remap( $style, $localDir, $remoteDir, true );
 901         }
 902
 903         /**
 904          * Get whether CSS for this module should be flipped
 905          * @param ResourceLoaderContext $context
 906          * @return bool
 907          */
 908         public function getFlip( $context ) {
 909                 return $context->getDirection() === 'rtl' && !$this->noflip;
 910         }
 911
 912         /**
 913          * Get target(s) for the module, eg ['desktop'] or ['desktop', 'mobile']
 914          *
 915          * @return array Array of strings
 916          */
 917         public function getTargets() {
 918                 return $this->targets;
 919         }
 920
 921         /**
 922          * Get the module's load type.
 923          *
 924          * @since 1.28
 925          * @return string
 926          */
 927         public function getType() {
 928                 $canBeStylesOnly = !(
 929                         // All options except 'styles', 'skinStyles' and 'debugRaw'
 930                         $this->scripts
 931                         || $this->debugScripts
 932                         || $this->templates
 933                         || $this->languageScripts
 934                         || $this->skinScripts
 935                         || $this->dependencies
 936                         || $this->messages
 937                         || $this->skipFunction
 938                         || $this->raw
 939                 );
 940                 return $canBeStylesOnly ? self::LOAD_STYLES : self::LOAD_GENERAL;
 941         }
 942
 943         /**
 944          * Compile a LESS file into CSS.
 945          *
 946          * Keeps track of all used files and adds them to localFileRefs.
 947          *
 948          * @since 1.22
 949          * @since 1.27 Added $context paramter.
 950          * @throws Exception If less.php encounters a parse error
 951          * @param string $fileName File path of LESS source
 952          * @param ResourceLoaderContext $context Context in which to generate script
 953          * @return string CSS source
 954          */
 955         protected function compileLessFile( $fileName, ResourceLoaderContext $context ) {
 956                 static $cache;
 957
 958                 if ( !$cache ) {
 959                         $cache = ObjectCache::getLocalServerInstance( CACHE_ANYTHING );
 960                 }
 961
 962                 // Construct a cache key from the LESS file name and a hash digest
 963                 // of the LESS variables used for compilation.
 964                 $vars = $this->getLessVars( $context );
 965                 ksort( $vars );
 966                 $varsHash = hash( 'md4', serialize( $vars ) );
 967                 $cacheKey = $cache->makeGlobalKey( 'LESS', $fileName, $varsHash );
 968                 $cachedCompile = $cache->get( $cacheKey );
 969
 970                 // If we got a cached value, we have to validate it by getting a
 971                 // checksum of all the files that were loaded by the parser and
 972                 // ensuring it matches the cached entry's.
 973                 if ( isset( $cachedCompile['hash'] ) ) {
 974                         $contentHash = FileContentsHasher::getFileContentsHash( $cachedCompile['files'] );
 975                         if ( $contentHash === $cachedCompile['hash'] ) {
 976                                 $this->localFileRefs = array_merge( $this->localFileRefs, $cachedCompile['files'] );
 977                                 return $cachedCompile['css'];
 978                         }
 979                 }
 980
 981                 $compiler = $context->getResourceLoader()->getLessCompiler( $vars );
 982                 $css = $compiler->parseFile( $fileName )->getCss();
 983                 $files = $compiler->AllParsedFiles();
 984                 $this->localFileRefs = array_merge( $this->localFileRefs, $files );
 985
 986                 // Cache for 24 hours (86400 seconds).
 987                 $cache->set( $cacheKey, [
 988                         'css'   => $css,
 989                         'files' => $files,
 990                         'hash'  => FileContentsHasher::getFileContentsHash( $files ),
 991                 ], 3600 * 24 );
 992
 993                 return $css;
 994         }
 995
 996         /**
 997          * Takes named templates by the module and returns an array mapping.
 998          * @return array Templates mapping template alias to content
 999          * @throws MWException
1000          */
1001         public function getTemplates() {
1002                 $templates = [];
1003
1004                 foreach ( $this->templates as $alias => $templatePath ) {
1005                         // Alias is optional
1006                         if ( is_int( $alias ) ) {
1007                                 $alias = $templatePath;
1008                         }
1009                         $localPath = $this->getLocalPath( $templatePath );
1010                         if ( file_exists( $localPath ) ) {
1011                                 $content = file_get_contents( $localPath );
1012                                 $templates[$alias] = $this->stripBom( $content );
1013                         } else {
1014                                 $msg = __METHOD__ . ": template file not found: \"$localPath\"";
1015                                 wfDebugLog( 'resourceloader', $msg );
1016                                 throw new MWException( $msg );
1017                         }
1018                 }
1019                 return $templates;
1020         }
1021
1022         /**
1023          * Takes an input string and removes the UTF-8 BOM character if present
1024          *
1025          * We need to remove these after reading a file, because we concatenate our files and
1026          * the BOM character is not valid in the middle of a string.
1027          * We already assume UTF-8 everywhere, so this should be safe.
1028          *
1029          * @param string $input
1030          * @return string Input minus the intial BOM char
1031          */
1032         protected function stripBom( $input ) {
1033                 if ( substr_compare( "\xef\xbb\xbf", $input, 0, 3 ) === 0 ) {
1034                         return substr( $input, 3 );
1035                 }
1036                 return $input;
1037         }
1038 }