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         /* Protected Members */
  30
  31         /** @var string Local base path, see __construct() */
  32         protected $localBasePath = '';
  33
  34         /** @var string Remote base path, see __construct() */
  35         protected $remoteBasePath = '';
  36
  37         /** @var array Saves a list of the templates named by the modules. */
  38         protected $templates = [];
  39
  40         /**
  41          * @var array List of paths to JavaScript files to always include
  42          * @par Usage:
  43          * @code
  44          * [ [file-path], [file-path], ... ]
  45          * @endcode
  46          */
  47         protected $scripts = [];
  48
  49         /**
  50          * @var array List of JavaScript files to include when using a specific language
  51          * @par Usage:
  52          * @code
  53          * [ [language-code] => [ [file-path], [file-path], ... ], ... ]
  54          * @endcode
  55          */
  56         protected $languageScripts = [];
  57
  58         /**
  59          * @var array List of JavaScript files to include when using a specific skin
  60          * @par Usage:
  61          * @code
  62          * [ [skin-name] => [ [file-path], [file-path], ... ], ... ]
  63          * @endcode
  64          */
  65         protected $skinScripts = [];
  66
  67         /**
  68          * @var array List of paths to JavaScript files to include in debug mode
  69          * @par Usage:
  70          * @code
  71          * [ [skin-name] => [ [file-path], [file-path], ... ], ... ]
  72          * @endcode
  73          */
  74         protected $debugScripts = [];
  75
  76         /**
  77          * @var array List of paths to CSS files to always include
  78          * @par Usage:
  79          * @code
  80          * [ [file-path], [file-path], ... ]
  81          * @endcode
  82          */
  83         protected $styles = [];
  84
  85         /**
  86          * @var array List of paths to CSS files to include when using specific skins
  87          * @par Usage:
  88          * @code
  89          * [ [file-path], [file-path], ... ]
  90          * @endcode
  91          */
  92         protected $skinStyles = [];
  93
  94         /**
  95          * @var array List of modules this module depends on
  96          * @par Usage:
  97          * @code
  98          * [ [file-path], [file-path], ... ]
  99          * @endcode
 100          */
 101         protected $dependencies = [];
 102
 103         /**
 104          * @var string File name containing the body of the skip function
 105          */
 106         protected $skipFunction = null;
 107
 108         /**
 109          * @var array List of message keys used by this module
 110          * @par Usage:
 111          * @code
 112          * [ [message-key], [message-key], ... ]
 113          * @endcode
 114          */
 115         protected $messages = [];
 116
 117         /** @var string Name of group to load this module in */
 118         protected $group;
 119
 120         /** @var bool Link to raw files in debug mode */
 121         protected $debugRaw = true;
 122
 123         /** @var bool Whether mw.loader.state() call should be omitted */
 124         protected $raw = false;
 125
 126         protected $targets = [ 'desktop' ];
 127
 128         /** @var bool Whether CSSJanus flipping should be skipped for this module */
 129         protected $noflip = false;
 130
 131         /**
 132          * @var bool Whether getStyleURLsForDebug should return raw file paths,
 133          * or return load.php urls
 134          */
 135         protected $hasGeneratedStyles = false;
 136
 137         /**
 138          * @var array Place where readStyleFile() tracks file dependencies
 139          * @par Usage:
 140          * @code
 141          * [ [file-path], [file-path], ... ]
 142          * @endcode
 143          */
 144         protected $localFileRefs = [];
 145
 146         /**
 147          * @var array Place where readStyleFile() tracks file dependencies for non-existent files.
 148          * Used in tests to detect missing dependencies.
 149          */
 150         protected $missingLocalFileRefs = [];
 151
 152         /* Methods */
 153
 154         /**
 155          * Constructs a new module from an options array.
 156          *
 157          * @param array $options List of options; if not given or empty, an empty module will be
 158          *     constructed
 159          * @param string $localBasePath Base path to prepend to all local paths in $options. Defaults
 160          *     to $IP
 161          * @param string $remoteBasePath Base path to prepend to all remote paths in $options. Defaults
 162          *     to $wgResourceBasePath
 163          *
 164          * Below is a description for the $options array:
 165          * @throws InvalidArgumentException
 166          * @par Construction options:
 167          * @code
 168          *     [
 169          *         // Base path to prepend to all local paths in $options. Defaults to $IP
 170          *         'localBasePath' => [base path],
 171          *         // Base path to prepend to all remote paths in $options. Defaults to $wgResourceBasePath
 172          *         'remoteBasePath' => [base path],
 173          *         // Equivalent of remoteBasePath, but relative to $wgExtensionAssetsPath
 174          *         'remoteExtPath' => [base path],
 175          *         // Equivalent of remoteBasePath, but relative to $wgStylePath
 176          *         'remoteSkinPath' => [base path],
 177          *         // Scripts to always include
 178          *         'scripts' => [file path string or array of file path strings],
 179          *         // Scripts to include in specific language contexts
 180          *         'languageScripts' => [
 181          *             [language code] => [file path string or array of file path strings],
 182          *         ],
 183          *         // Scripts to include in specific skin contexts
 184          *         'skinScripts' => [
 185          *             [skin name] => [file path string or array of file path strings],
 186          *         ],
 187          *         // Scripts to include in debug contexts
 188          *         'debugScripts' => [file path string or array of file path strings],
 189          *         // Modules which must be loaded before this module
 190          *         'dependencies' => [module name string or array of module name strings],
 191          *         'templates' => [
 192          *             [template alias with file.ext] => [file path to a template file],
 193          *         ],
 194          *         // Styles to always load
 195          *         'styles' => [file path string or array of file path strings],
 196          *         // Styles to include in specific skin contexts
 197          *         'skinStyles' => [
 198          *             [skin name] => [file path string or array of file path strings],
 199          *         ],
 200          *         // Messages to always load
 201          *         'messages' => [array of message key strings],
 202          *         // Group which this module should be loaded together with
 203          *         'group' => [group name string],
 204          *         // Function that, if it returns true, makes the loader skip this module.
 205          *         // The file must contain valid JavaScript for execution in a private function.
 206          *         // The file must not contain the "function () {" and "}" wrapper though.
 207          *         'skipFunction' => [file path]
 208          *     ]
 209          * @endcode
 210          */
 211         public function __construct(
 212                 $options = [],
 213                 $localBasePath = null,
 214                 $remoteBasePath = null
 215         ) {
 216                 // Flag to decide whether to automagically add the mediawiki.template module
 217                 $hasTemplates = false;
 218                 // localBasePath and remoteBasePath both have unbelievably long fallback chains
 219                 // and need to be handled separately.
 220                 list( $this->localBasePath, $this->remoteBasePath ) =
 221                         self::extractBasePaths( $options, $localBasePath, $remoteBasePath );
 222
 223                 // Extract, validate and normalise remaining options
 224                 foreach ( $options as $member => $option ) {
 225                         switch ( $member ) {
 226                                 // Lists of file paths
 227                                 case 'scripts':
 228                                 case 'debugScripts':
 229                                 case 'styles':
 230                                         $this->{$member} = (array)$option;
 231                                         break;
 232                                 case 'templates':
 233                                         $hasTemplates = true;
 234                                         $this->{$member} = (array)$option;
 235                                         break;
 236                                 // Collated lists of file paths
 237                                 case 'languageScripts':
 238                                 case 'skinScripts':
 239                                 case 'skinStyles':
 240                                         if ( !is_array( $option ) ) {
 241                                                 throw new InvalidArgumentException(
 242                                                         "Invalid collated file path list error. " .
 243                                                         "'$option' given, array expected."
 244                                                 );
 245                                         }
 246                                         foreach ( $option as $key => $value ) {
 247                                                 if ( !is_string( $key ) ) {
 248                                                         throw new InvalidArgumentException(
 249                                                                 "Invalid collated file path list key error. " .
 250                                                                 "'$key' given, string expected."
 251                                                         );
 252                                                 }
 253                                                 $this->{$member}[$key] = (array)$value;
 254                                         }
 255                                         break;
 256                                 case 'deprecated':
 257                                         $this->deprecated = $option;
 258                                         break;
 259                                 // Lists of strings
 260                                 case 'dependencies':
 261                                 case 'messages':
 262                                 case 'targets':
 263                                         // Normalise
 264                                         $option = array_values( array_unique( (array)$option ) );
 265                                         sort( $option );
 266
 267                                         $this->{$member} = $option;
 268                                         break;
 269                                 // Single strings
 270                                 case 'group':
 271                                 case 'skipFunction':
 272                                         $this->{$member} = (string)$option;
 273                                         break;
 274                                 // Single booleans
 275                                 case 'debugRaw':
 276                                 case 'raw':
 277                                 case 'noflip':
 278                                         $this->{$member} = (bool)$option;
 279                                         break;
 280                         }
 281                 }
 282                 if ( $hasTemplates ) {
 283                         $this->dependencies[] = 'mediawiki.template';
 284                         // Ensure relevant template compiler module gets loaded
 285                         foreach ( $this->templates as $alias => $templatePath ) {
 286                                 if ( is_int( $alias ) ) {
 287                                         $alias = $templatePath;
 288                                 }
 289                                 $suffix = explode( '.', $alias );
 290                                 $suffix = end( $suffix );
 291                                 $compilerModule = 'mediawiki.template.' . $suffix;
 292                                 if ( $suffix !== 'html' && !in_array( $compilerModule, $this->dependencies ) ) {
 293                                         $this->dependencies[] = $compilerModule;
 294                                 }
 295                         }
 296                 }
 297         }
 298
 299         /**
 300          * Extract a pair of local and remote base paths from module definition information.
 301          * Implementation note: the amount of global state used in this function is staggering.
 302          *
 303          * @param array $options Module definition
 304          * @param string $localBasePath Path to use if not provided in module definition. Defaults
 305          *     to $IP
 306          * @param string $remoteBasePath Path to use if not provided in module definition. Defaults
 307          *     to $wgResourceBasePath
 308          * @return array Array( localBasePath, remoteBasePath )
 309          */
 310         public static function extractBasePaths(
 311                 $options = [],
 312                 $localBasePath = null,
 313                 $remoteBasePath = null
 314         ) {
 315                 global $IP, $wgResourceBasePath;
 316
 317                 // The different ways these checks are done, and their ordering, look very silly,
 318                 // but were preserved for backwards-compatibility just in case. Tread lightly.
 319
 320                 if ( $localBasePath === null ) {
 321                         $localBasePath = $IP;
 322                 }
 323                 if ( $remoteBasePath === null ) {
 324                         $remoteBasePath = $wgResourceBasePath;
 325                 }
 326
 327                 if ( isset( $options['remoteExtPath'] ) ) {
 328                         global $wgExtensionAssetsPath;
 329                         $remoteBasePath = $wgExtensionAssetsPath . '/' . $options['remoteExtPath'];
 330                 }
 331
 332                 if ( isset( $options['remoteSkinPath'] ) ) {
 333                         global $wgStylePath;
 334                         $remoteBasePath = $wgStylePath . '/' . $options['remoteSkinPath'];
 335                 }
 336
 337                 if ( array_key_exists( 'localBasePath', $options ) ) {
 338                         $localBasePath = (string)$options['localBasePath'];
 339                 }
 340
 341                 if ( array_key_exists( 'remoteBasePath', $options ) ) {
 342                         $remoteBasePath = (string)$options['remoteBasePath'];
 343                 }
 344
 345                 return [ $localBasePath, $remoteBasePath ];
 346         }
 347
 348         /**
 349          * Gets all scripts for a given context concatenated together.
 350          *
 351          * @param ResourceLoaderContext $context Context in which to generate script
 352          * @return string JavaScript code for $context
 353          */
 354         public function getScript( ResourceLoaderContext $context ) {
 355                 $files = $this->getScriptFiles( $context );
 356                 return $this->getDeprecationInformation() . $this->readScriptFiles( $files );
 357         }
 358
 359         /**
 360          * @param ResourceLoaderContext $context
 361          * @return array
 362          */
 363         public function getScriptURLsForDebug( ResourceLoaderContext $context ) {
 364                 $urls = [];
 365                 foreach ( $this->getScriptFiles( $context ) as $file ) {
 366                         $urls[] = OutputPage::transformResourcePath(
 367                                 $this->getConfig(),
 368                                 $this->getRemotePath( $file )
 369                         );
 370                 }
 371                 return $urls;
 372         }
 373
 374         /**
 375          * @return bool
 376          */
 377         public function supportsURLLoading() {
 378                 return $this->debugRaw;
 379         }
 380
 381         /**
 382          * Get all styles for a given context.
 383          *
 384          * @param ResourceLoaderContext $context
 385          * @return array CSS code for $context as an associative array mapping media type to CSS text.
 386          */
 387         public function getStyles( ResourceLoaderContext $context ) {
 388                 $styles = $this->readStyleFiles(
 389                         $this->getStyleFiles( $context ),
 390                         $this->getFlip( $context ),
 391                         $context
 392                 );
 393                 // Collect referenced files
 394                 $this->saveFileDependencies( $context, $this->localFileRefs );
 395
 396                 return $styles;
 397         }
 398
 399         /**
 400          * @param ResourceLoaderContext $context
 401          * @return array
 402          */
 403         public function getStyleURLsForDebug( ResourceLoaderContext $context ) {
 404                 if ( $this->hasGeneratedStyles ) {
 405                         // Do the default behaviour of returning a url back to load.php
 406                         // but with only=styles.
 407                         return parent::getStyleURLsForDebug( $context );
 408                 }
 409                 // Our module consists entirely of real css files,
 410                 // in debug mode we can load those directly.
 411                 $urls = [];
 412                 foreach ( $this->getStyleFiles( $context ) as $mediaType => $list ) {
 413                         $urls[$mediaType] = [];
 414                         foreach ( $list as $file ) {
 415                                 $urls[$mediaType][] = OutputPage::transformResourcePath(
 416                                         $this->getConfig(),
 417                                         $this->getRemotePath( $file )
 418                                 );
 419                         }
 420                 }
 421                 return $urls;
 422         }
 423
 424         /**
 425          * Gets list of message keys used by this module.
 426          *
 427          * @return array List of message keys
 428          */
 429         public function getMessages() {
 430                 return $this->messages;
 431         }
 432
 433         /**
 434          * Gets the name of the group this module should be loaded in.
 435          *
 436          * @return string Group name
 437          */
 438         public function getGroup() {
 439                 return $this->group;
 440         }
 441
 442         /**
 443          * Gets list of names of modules this module depends on.
 444          * @param ResourceLoaderContext|null $context
 445          * @return array List of module names
 446          */
 447         public function getDependencies( ResourceLoaderContext $context = null ) {
 448                 return $this->dependencies;
 449         }
 450
 451         /**
 452          * Get the skip function.
 453          * @return null|string
 454          * @throws MWException
 455          */
 456         public function getSkipFunction() {
 457                 if ( !$this->skipFunction ) {
 458                         return null;
 459                 }
 460
 461                 $localPath = $this->getLocalPath( $this->skipFunction );
 462                 if ( !file_exists( $localPath ) ) {
 463                         throw new MWException( __METHOD__ . ": skip function file not found: \"$localPath\"" );
 464                 }
 465                 $contents = $this->stripBom( file_get_contents( $localPath ) );
 466                 if ( $this->getConfig()->get( 'ResourceLoaderValidateStaticJS' ) ) {
 467                         $contents = $this->validateScriptFile( $localPath, $contents );
 468                 }
 469                 return $contents;
 470         }
 471
 472         /**
 473          * @return bool
 474          */
 475         public function isRaw() {
 476                 return $this->raw;
 477         }
 478
 479         /**
 480          * Disable module content versioning.
 481          *
 482          * This class uses getDefinitionSummary() instead, to avoid filesystem overhead
 483          * involved with building the full module content inside a startup request.
 484          *
 485          * @return bool
 486          */
 487         public function enableModuleContentVersion() {
 488                 return false;
 489         }
 490
 491         /**
 492          * Helper method to gather file hashes for getDefinitionSummary.
 493          *
 494          * This function is context-sensitive, only computing hashes of files relevant to the
 495          * given language, skin, etc.
 496          *
 497          * @see ResourceLoaderModule::getFileDependencies
 498          * @param ResourceLoaderContext $context
 499          * @return array
 500          */
 501         protected function getFileHashes( ResourceLoaderContext $context ) {
 502                 $files = [];
 503
 504                 // Flatten style files into $files
 505                 $styles = self::collateFilePathListByOption( $this->styles, 'media', 'all' );
 506                 foreach ( $styles as $styleFiles ) {
 507                         $files = array_merge( $files, $styleFiles );
 508                 }
 509
 510                 $skinFiles = self::collateFilePathListByOption(
 511                         self::tryForKey( $this->skinStyles, $context->getSkin(), 'default' ),
 512                         'media',
 513                         'all'
 514                 );
 515                 foreach ( $skinFiles as $styleFiles ) {
 516                         $files = array_merge( $files, $styleFiles );
 517                 }
 518
 519                 // Final merge, this should result in a master list of dependent files
 520                 $files = array_merge(
 521                         $files,
 522                         $this->scripts,
 523                         $this->templates,
 524                         $context->getDebug() ? $this->debugScripts : [],
 525                         $this->getLanguageScripts( $context->getLanguage() ),
 526                         self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' )
 527                 );
 528                 if ( $this->skipFunction ) {
 529                         $files[] = $this->skipFunction;
 530                 }
 531                 $files = array_map( [ $this, 'getLocalPath' ], $files );
 532                 // File deps need to be treated separately because they're already prefixed
 533                 $files = array_merge( $files, $this->getFileDependencies( $context ) );
 534                 // Filter out any duplicates from getFileDependencies() and others.
 535                 // Most commonly introduced by compileLessFile(), which always includes the
 536                 // entry point Less file we already know about.
 537                 $files = array_values( array_unique( $files ) );
 538
 539                 // Don't include keys or file paths here, only the hashes. Including that would needlessly
 540                 // cause global cache invalidation when files move or if e.g. the MediaWiki path changes.
 541                 // Any significant ordering is already detected by the definition summary.
 542                 return array_map( [ __CLASS__, 'safeFileHash' ], $files );
 543         }
 544
 545         /**
 546          * Get the definition summary for this module.
 547          *
 548          * @param ResourceLoaderContext $context
 549          * @return array
 550          */
 551         public function getDefinitionSummary( ResourceLoaderContext $context ) {
 552                 $summary = parent::getDefinitionSummary( $context );
 553
 554                 $options = [];
 555                 foreach ( [
 556                         // The following properties are omitted because they don't affect the module reponse:
 557                         // - localBasePath (Per T104950; Changes when absolute directory name changes. If
 558                         //    this affects 'scripts' and other file paths, getFileHashes accounts for that.)
 559                         // - remoteBasePath (Per T104950)
 560                         // - dependencies (provided via startup module)
 561                         // - targets
 562                         // - group (provided via startup module)
 563                         'scripts',
 564                         'debugScripts',
 565                         'styles',
 566                         'languageScripts',
 567                         'skinScripts',
 568                         'skinStyles',
 569                         'messages',
 570                         'templates',
 571                         'skipFunction',
 572                         'debugRaw',
 573                         'raw',
 574                 ] as $member ) {
 575                         $options[$member] = $this->{$member};
 576                 };
 577
 578                 $summary[] = [
 579                         'options' => $options,
 580                         'fileHashes' => $this->getFileHashes( $context ),
 581                         'messageBlob' => $this->getMessageBlob( $context ),
 582                 ];
 583
 584                 $lessVars = $this->getLessVars( $context );
 585                 if ( $lessVars ) {
 586                         $summary[] = [ 'lessVars' => $lessVars ];
 587                 }
 588
 589                 return $summary;
 590         }
 591
 592         /**
 593          * @param string|ResourceLoaderFilePath $path
 594          * @return string
 595          */
 596         protected function getLocalPath( $path ) {
 597                 if ( $path instanceof ResourceLoaderFilePath ) {
 598                         return $path->getLocalPath();
 599                 }
 600
 601                 return "{$this->localBasePath}/$path";
 602         }
 603
 604         /**
 605          * @param string|ResourceLoaderFilePath $path
 606          * @return string
 607          */
 608         protected function getRemotePath( $path ) {
 609                 if ( $path instanceof ResourceLoaderFilePath ) {
 610                         return $path->getRemotePath();
 611                 }
 612
 613                 return "{$this->remoteBasePath}/$path";
 614         }
 615
 616         /**
 617          * Infer the stylesheet language from a stylesheet file path.
 618          *
 619          * @since 1.22
 620          * @param string $path
 621          * @return string The stylesheet language name
 622          */
 623         public function getStyleSheetLang( $path ) {
 624                 return preg_match( '/\.less$/i', $path ) ? 'less' : 'css';
 625         }
 626
 627         /**
 628          * Collates file paths by option (where provided).
 629          *
 630          * @param array $list List of file paths in any combination of index/path
 631          *     or path/options pairs
 632          * @param string $option Option name
 633          * @param mixed $default Default value if the option isn't set
 634          * @return array List of file paths, collated by $option
 635          */
 636         protected static function collateFilePathListByOption( array $list, $option, $default ) {
 637                 $collatedFiles = [];
 638                 foreach ( (array)$list as $key => $value ) {
 639                         if ( is_int( $key ) ) {
 640                                 // File name as the value
 641                                 if ( !isset( $collatedFiles[$default] ) ) {
 642                                         $collatedFiles[$default] = [];
 643                                 }
 644                                 $collatedFiles[$default][] = $value;
 645                         } elseif ( is_array( $value ) ) {
 646                                 // File name as the key, options array as the value
 647                                 $optionValue = isset( $value[$option] ) ? $value[$option] : $default;
 648                                 if ( !isset( $collatedFiles[$optionValue] ) ) {
 649                                         $collatedFiles[$optionValue] = [];
 650                                 }
 651                                 $collatedFiles[$optionValue][] = $key;
 652                         }
 653                 }
 654                 return $collatedFiles;
 655         }
 656
 657         /**
 658          * Get a list of element that match a key, optionally using a fallback key.
 659          *
 660          * @param array $list List of lists to select from
 661          * @param string $key Key to look for in $map
 662          * @param string $fallback Key to look for in $list if $key doesn't exist
 663          * @return array List of elements from $map which matched $key or $fallback,
 664          *  or an empty list in case of no match
 665          */
 666         protected static function tryForKey( array $list, $key, $fallback = null ) {
 667                 if ( isset( $list[$key] ) && is_array( $list[$key] ) ) {
 668                         return $list[$key];
 669                 } elseif ( is_string( $fallback )
 670                         && isset( $list[$fallback] )
 671                         && is_array( $list[$fallback] )
 672                 ) {
 673                         return $list[$fallback];
 674                 }
 675                 return [];
 676         }
 677
 678         /**
 679          * Get a list of file paths for all scripts in this module, in order of proper execution.
 680          *
 681          * @param ResourceLoaderContext $context
 682          * @return array List of file paths
 683          */
 684         protected function getScriptFiles( ResourceLoaderContext $context ) {
 685                 $files = array_merge(
 686                         $this->scripts,
 687                         $this->getLanguageScripts( $context->getLanguage() ),
 688                         self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' )
 689                 );
 690                 if ( $context->getDebug() ) {
 691                         $files = array_merge( $files, $this->debugScripts );
 692                 }
 693
 694                 return array_unique( $files, SORT_REGULAR );
 695         }
 696
 697         /**
 698          * Get the set of language scripts for the given language,
 699          * possibly using a fallback language.
 700          *
 701          * @param string $lang
 702          * @return array
 703          */
 704         private function getLanguageScripts( $lang ) {
 705                 $scripts = self::tryForKey( $this->languageScripts, $lang );
 706                 if ( $scripts ) {
 707                         return $scripts;
 708                 }
 709                 $fallbacks = Language::getFallbacksFor( $lang );
 710                 foreach ( $fallbacks as $lang ) {
 711                         $scripts = self::tryForKey( $this->languageScripts, $lang );
 712                         if ( $scripts ) {
 713                                 return $scripts;
 714                         }
 715                 }
 716
 717                 return [];
 718         }
 719
 720         /**
 721          * Get a list of file paths for all styles in this module, in order of proper inclusion.
 722          *
 723          * @param ResourceLoaderContext $context
 724          * @return array List of file paths
 725          */
 726         public function getStyleFiles( ResourceLoaderContext $context ) {
 727                 return array_merge_recursive(
 728                         self::collateFilePathListByOption( $this->styles, 'media', 'all' ),
 729                         self::collateFilePathListByOption(
 730                                 self::tryForKey( $this->skinStyles, $context->getSkin(), 'default' ),
 731                                 'media',
 732                                 'all'
 733                         )
 734                 );
 735         }
 736
 737         /**
 738          * Gets a list of file paths for all skin styles in the module used by
 739          * the skin.
 740          *
 741          * @param string $skinName The name of the skin
 742          * @return array A list of file paths collated by media type
 743          */
 744         protected function getSkinStyleFiles( $skinName ) {
 745                 return self::collateFilePathListByOption(
 746                         self::tryForKey( $this->skinStyles, $skinName ),
 747                         'media',
 748                         'all'
 749                 );
 750         }
 751
 752         /**
 753          * Gets a list of file paths for all skin style files in the module,
 754          * for all available skins.
 755          *
 756          * @return array A list of file paths collated by media type
 757          */
 758         protected function getAllSkinStyleFiles() {
 759                 $styleFiles = [];
 760                 $internalSkinNames = array_keys( Skin::getSkinNames() );
 761                 $internalSkinNames[] = 'default';
 762
 763                 foreach ( $internalSkinNames as $internalSkinName ) {
 764                         $styleFiles = array_merge_recursive(
 765                                 $styleFiles,
 766                                 $this->getSkinStyleFiles( $internalSkinName )
 767                         );
 768                 }
 769
 770                 return $styleFiles;
 771         }
 772
 773         /**
 774          * Returns all style files and all skin style files used by this module.
 775          *
 776          * @return array
 777          */
 778         public function getAllStyleFiles() {
 779                 $collatedStyleFiles = array_merge_recursive(
 780                         self::collateFilePathListByOption( $this->styles, 'media', 'all' ),
 781                         $this->getAllSkinStyleFiles()
 782                 );
 783
 784                 $result = [];
 785
 786                 foreach ( $collatedStyleFiles as $media => $styleFiles ) {
 787                         foreach ( $styleFiles as $styleFile ) {
 788                                 $result[] = $this->getLocalPath( $styleFile );
 789                         }
 790                 }
 791
 792                 return $result;
 793         }
 794
 795         /**
 796          * Gets the contents of a list of JavaScript files.
 797          *
 798          * @param array $scripts List of file paths to scripts to read, remap and concetenate
 799          * @throws MWException
 800          * @return string Concatenated and remapped JavaScript data from $scripts
 801          */
 802         protected function readScriptFiles( array $scripts ) {
 803                 if ( empty( $scripts ) ) {
 804                         return '';
 805                 }
 806                 $js = '';
 807                 foreach ( array_unique( $scripts, SORT_REGULAR ) as $fileName ) {
 808                         $localPath = $this->getLocalPath( $fileName );
 809                         if ( !file_exists( $localPath ) ) {
 810                                 throw new MWException( __METHOD__ . ": script file not found: \"$localPath\"" );
 811                         }
 812                         $contents = $this->stripBom( file_get_contents( $localPath ) );
 813                         if ( $this->getConfig()->get( 'ResourceLoaderValidateStaticJS' ) ) {
 814                                 // Static files don't really need to be checked as often; unlike
 815                                 // on-wiki module they shouldn't change unexpectedly without
 816                                 // admin interference.
 817                                 $contents = $this->validateScriptFile( $fileName, $contents );
 818                         }
 819                         $js .= $contents . "\n";
 820                 }
 821                 return $js;
 822         }
 823
 824         /**
 825          * Gets the contents of a list of CSS files.
 826          *
 827          * @param array $styles List of media type/list of file paths pairs, to read, remap and
 828          * concetenate
 829          * @param bool $flip
 830          * @param ResourceLoaderContext $context
 831          *
 832          * @throws MWException
 833          * @return array List of concatenated and remapped CSS data from $styles,
 834          *     keyed by media type
 835          *
 836          * @since 1.27 Calling this method without a ResourceLoaderContext instance
 837          *   is deprecated.
 838          */
 839         public function readStyleFiles( array $styles, $flip, $context = null ) {
 840                 if ( $context === null ) {
 841                         wfDeprecated( __METHOD__ . ' without a ResourceLoader context', '1.27' );
 842                         $context = ResourceLoaderContext::newDummyContext();
 843                 }
 844
 845                 if ( empty( $styles ) ) {
 846                         return [];
 847                 }
 848                 foreach ( $styles as $media => $files ) {
 849                         $uniqueFiles = array_unique( $files, SORT_REGULAR );
 850                         $styleFiles = [];
 851                         foreach ( $uniqueFiles as $file ) {
 852                                 $styleFiles[] = $this->readStyleFile( $file, $flip, $context );
 853                         }
 854                         $styles[$media] = implode( "\n", $styleFiles );
 855                 }
 856                 return $styles;
 857         }
 858
 859         /**
 860          * Reads a style file.
 861          *
 862          * This method can be used as a callback for array_map()
 863          *
 864          * @param string $path File path of style file to read
 865          * @param bool $flip
 866          * @param ResourceLoaderContext $context
 867          *
 868          * @return string CSS data in script file
 869          * @throws MWException If the file doesn't exist
 870          */
 871         protected function readStyleFile( $path, $flip, $context ) {
 872                 $localPath = $this->getLocalPath( $path );
 873                 $remotePath = $this->getRemotePath( $path );
 874                 if ( !file_exists( $localPath ) ) {
 875                         $msg = __METHOD__ . ": style file not found: \"$localPath\"";
 876                         wfDebugLog( 'resourceloader', $msg );
 877                         throw new MWException( $msg );
 878                 }
 879
 880                 if ( $this->getStyleSheetLang( $localPath ) === 'less' ) {
 881                         $style = $this->compileLessFile( $localPath, $context );
 882                         $this->hasGeneratedStyles = true;
 883                 } else {
 884                         $style = $this->stripBom( file_get_contents( $localPath ) );
 885                 }
 886
 887                 if ( $flip ) {
 888                         $style = CSSJanus::transform( $style, true, false );
 889                 }
 890                 $localDir = dirname( $localPath );
 891                 $remoteDir = dirname( $remotePath );
 892                 // Get and register local file references
 893                 $localFileRefs = CSSMin::getLocalFileReferences( $style, $localDir );
 894                 foreach ( $localFileRefs as $file ) {
 895                         if ( file_exists( $file ) ) {
 896                                 $this->localFileRefs[] = $file;
 897                         } else {
 898                                 $this->missingLocalFileRefs[] = $file;
 899                         }
 900                 }
 901                 // Don't cache this call. remap() ensures data URIs embeds are up to date,
 902                 // and urls contain correct content hashes in their query string. (T128668)
 903                 return CSSMin::remap( $style, $localDir, $remoteDir, true );
 904         }
 905
 906         /**
 907          * Get whether CSS for this module should be flipped
 908          * @param ResourceLoaderContext $context
 909          * @return bool
 910          */
 911         public function getFlip( $context ) {
 912                 return $context->getDirection() === 'rtl' && !$this->noflip;
 913         }
 914
 915         /**
 916          * Get target(s) for the module, eg ['desktop'] or ['desktop', 'mobile']
 917          *
 918          * @return array Array of strings
 919          */
 920         public function getTargets() {
 921                 return $this->targets;
 922         }
 923
 924         /**
 925          * Get the module's load type.
 926          *
 927          * @since 1.28
 928          * @return string
 929          */
 930         public function getType() {
 931                 $canBeStylesOnly = !(
 932                         // All options except 'styles', 'skinStyles' and 'debugRaw'
 933                         $this->scripts
 934                         || $this->debugScripts
 935                         || $this->templates
 936                         || $this->languageScripts
 937                         || $this->skinScripts
 938                         || $this->dependencies
 939                         || $this->messages
 940                         || $this->skipFunction
 941                         || $this->raw
 942                 );
 943                 return $canBeStylesOnly ? self::LOAD_STYLES : self::LOAD_GENERAL;
 944         }
 945
 946         /**
 947          * Compile a LESS file into CSS.
 948          *
 949          * Keeps track of all used files and adds them to localFileRefs.
 950          *
 951          * @since 1.22
 952          * @since 1.27 Added $context paramter.
 953          * @throws Exception If less.php encounters a parse error
 954          * @param string $fileName File path of LESS source
 955          * @param ResourceLoaderContext $context Context in which to generate script
 956          * @return string CSS source
 957          */
 958         protected function compileLessFile( $fileName, ResourceLoaderContext $context ) {
 959                 static $cache;
 960
 961                 if ( !$cache ) {
 962                         $cache = ObjectCache::getLocalServerInstance( CACHE_ANYTHING );
 963                 }
 964
 965                 // Construct a cache key from the LESS file name and a hash digest
 966                 // of the LESS variables used for compilation.
 967                 $vars = $this->getLessVars( $context );
 968                 ksort( $vars );
 969                 $varsHash = hash( 'md4', serialize( $vars ) );
 970                 $cacheKey = $cache->makeGlobalKey( 'LESS', $fileName, $varsHash );
 971                 $cachedCompile = $cache->get( $cacheKey );
 972
 973                 // If we got a cached value, we have to validate it by getting a
 974                 // checksum of all the files that were loaded by the parser and
 975                 // ensuring it matches the cached entry's.
 976                 if ( isset( $cachedCompile['hash'] ) ) {
 977                         $contentHash = FileContentsHasher::getFileContentsHash( $cachedCompile['files'] );
 978                         if ( $contentHash === $cachedCompile['hash'] ) {
 979                                 $this->localFileRefs = array_merge( $this->localFileRefs, $cachedCompile['files'] );
 980                                 return $cachedCompile['css'];
 981                         }
 982                 }
 983
 984                 $compiler = $context->getResourceLoader()->getLessCompiler( $vars );
 985                 $css = $compiler->parseFile( $fileName )->getCss();
 986                 $files = $compiler->AllParsedFiles();
 987                 $this->localFileRefs = array_merge( $this->localFileRefs, $files );
 988
 989                 // Cache for 24 hours (86400 seconds).
 990                 $cache->set( $cacheKey, [
 991                         'css'   => $css,
 992                         'files' => $files,
 993                         'hash'  => FileContentsHasher::getFileContentsHash( $files ),
 994                 ], 3600 * 24 );
 995
 996                 return $css;
 997         }
 998
 999         /**
1000          * Takes named templates by the module and returns an array mapping.
1001          * @return array Templates mapping template alias to content
1002          * @throws MWException
1003          */
1004         public function getTemplates() {
1005                 $templates = [];
1006
1007                 foreach ( $this->templates as $alias => $templatePath ) {
1008                         // Alias is optional
1009                         if ( is_int( $alias ) ) {
1010                                 $alias = $templatePath;
1011                         }
1012                         $localPath = $this->getLocalPath( $templatePath );
1013                         if ( file_exists( $localPath ) ) {
1014                                 $content = file_get_contents( $localPath );
1015                                 $templates[$alias] = $this->stripBom( $content );
1016                         } else {
1017                                 $msg = __METHOD__ . ": template file not found: \"$localPath\"";
1018                                 wfDebugLog( 'resourceloader', $msg );
1019                                 throw new MWException( $msg );
1020                         }
1021                 }
1022                 return $templates;
1023         }
1024
1025         /**
1026          * Takes an input string and removes the UTF-8 BOM character if present
1027          *
1028          * We need to remove these after reading a file, because we concatenate our files and
1029          * the BOM character is not valid in the middle of a string.
1030          * We already assume UTF-8 everywhere, so this should be safe.
1031          *
1032          * @param string $input
1033          * @return string Input minus the intial BOM char
1034          */
1035         protected function stripBom( $input ) {
1036                 if ( substr_compare( "\xef\xbb\xbf", $input, 0, 3 ) === 0 ) {
1037                         return substr( $input, 3 );
1038                 }
1039                 return $input;
1040         }
1041 }