includes/resourceloader/ResourceLoaderStartUpModule.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @author Trevor Parscal
  20  * @author Roan Kattouw
  21  */
  22
  23 /**
  24  * Module for ResourceLoader initialization.
  25  *
  26  * See also <https://www.mediawiki.org/wiki/ResourceLoader/Features#Startup_Module>
  27  *
  28  * The startup module, as being called only from ResourceLoaderClientHtml, has
  29  * the ability to vary based extra query parameters, in addition to those
  30  * from ResourceLoaderContext:
  31  *
  32  * - target: Only register modules in the client intended for this target.
  33  *   Default: "desktop".
  34  *   See also: OutputPage::setTarget(), ResourceLoaderModule::getTargets().
  35  *
  36  * - safemode: Only register modules that have ORIGIN_CORE as their origin.
  37  *   This effectively disables ORIGIN_USER modules. (T185303)
  38  *   See also: OutputPage::disallowUserJs()
  39  */
  40 class ResourceLoaderStartUpModule extends ResourceLoaderModule {
  41
  42         // Cache for getConfigSettings() as it's called by multiple methods
  43         protected $configVars = [];
  44         protected $targets = [ 'desktop', 'mobile' ];
  45
  46         /**
  47          * @param ResourceLoaderContext $context
  48          * @return array
  49          */
  50         protected function getConfigSettings( $context ) {
  51                 $hash = $context->getHash();
  52                 if ( isset( $this->configVars[$hash] ) ) {
  53                         return $this->configVars[$hash];
  54                 }
  55
  56                 global $wgContLang;
  57                 $conf = $this->getConfig();
  58
  59                 // We can't use Title::newMainPage() if 'mainpage' is in
  60                 // $wgForceUIMsgAsContentMsg because that will try to use the session
  61                 // user's language and we have no session user. This does the
  62                 // equivalent but falling back to our ResourceLoaderContext language
  63                 // instead.
  64                 $mainPage = Title::newFromText( $context->msg( 'mainpage' )->inContentLanguage()->text() );
  65                 if ( !$mainPage ) {
  66                         $mainPage = Title::newFromText( 'Main Page' );
  67                 }
  68
  69                 /**
  70                  * Namespace related preparation
  71                  * - wgNamespaceIds: Key-value pairs of all localized, canonical and aliases for namespaces.
  72                  * - wgCaseSensitiveNamespaces: Array of namespaces that are case-sensitive.
  73                  */
  74                 $namespaceIds = $wgContLang->getNamespaceIds();
  75                 $caseSensitiveNamespaces = [];
  76                 foreach ( MWNamespace::getCanonicalNamespaces() as $index => $name ) {
  77                         $namespaceIds[$wgContLang->lc( $name )] = $index;
  78                         if ( !MWNamespace::isCapitalized( $index ) ) {
  79                                 $caseSensitiveNamespaces[] = $index;
  80                         }
  81                 }
  82
  83                 $illegalFileChars = $conf->get( 'IllegalFileChars' );
  84                 $oldCommentSchema = $conf->get( 'CommentTableSchemaMigrationStage' ) === MIGRATION_OLD;
  85
  86                 // Build list of variables
  87                 $vars = [
  88                         'wgLoadScript' => wfScript( 'load' ),
  89                         'debug' => $context->getDebug(),
  90                         'skin' => $context->getSkin(),
  91                         'stylepath' => $conf->get( 'StylePath' ),
  92                         'wgUrlProtocols' => wfUrlProtocols(),
  93                         'wgArticlePath' => $conf->get( 'ArticlePath' ),
  94                         'wgScriptPath' => $conf->get( 'ScriptPath' ),
  95                         'wgScript' => wfScript(),
  96                         'wgSearchType' => $conf->get( 'SearchType' ),
  97                         'wgVariantArticlePath' => $conf->get( 'VariantArticlePath' ),
  98                         // Force object to avoid "empty" associative array from
  99                         // becoming [] instead of {} in JS (T36604)
 100                         'wgActionPaths' => (object)$conf->get( 'ActionPaths' ),
 101                         'wgServer' => $conf->get( 'Server' ),
 102                         'wgServerName' => $conf->get( 'ServerName' ),
 103                         'wgUserLanguage' => $context->getLanguage(),
 104                         'wgContentLanguage' => $wgContLang->getCode(),
 105                         'wgTranslateNumerals' => $conf->get( 'TranslateNumerals' ),
 106                         'wgVersion' => $conf->get( 'Version' ),
 107                         'wgEnableAPI' => true, // Deprecated since MW 1.32
 108                         'wgEnableWriteAPI' => true, // Deprecated since MW 1.32
 109                         'wgMainPageTitle' => $mainPage->getPrefixedText(),
 110                         'wgFormattedNamespaces' => $wgContLang->getFormattedNamespaces(),
 111                         'wgNamespaceIds' => $namespaceIds,
 112                         'wgContentNamespaces' => MWNamespace::getContentNamespaces(),
 113                         'wgSiteName' => $conf->get( 'Sitename' ),
 114                         'wgDBname' => $conf->get( 'DBname' ),
 115                         'wgExtraSignatureNamespaces' => $conf->get( 'ExtraSignatureNamespaces' ),
 116                         'wgAvailableSkins' => Skin::getSkinNames(),
 117                         'wgExtensionAssetsPath' => $conf->get( 'ExtensionAssetsPath' ),
 118                         // MediaWiki sets cookies to have this prefix by default
 119                         'wgCookiePrefix' => $conf->get( 'CookiePrefix' ),
 120                         'wgCookieDomain' => $conf->get( 'CookieDomain' ),
 121                         'wgCookiePath' => $conf->get( 'CookiePath' ),
 122                         'wgCookieExpiration' => $conf->get( 'CookieExpiration' ),
 123                         'wgResourceLoaderMaxQueryLength' => $conf->get( 'ResourceLoaderMaxQueryLength' ),
 124                         'wgCaseSensitiveNamespaces' => $caseSensitiveNamespaces,
 125                         'wgLegalTitleChars' => Title::convertByteClassToUnicodeClass( Title::legalChars() ),
 126                         'wgIllegalFileChars' => Title::convertByteClassToUnicodeClass( $illegalFileChars ),
 127                         'wgResourceLoaderStorageVersion' => $conf->get( 'ResourceLoaderStorageVersion' ),
 128                         'wgResourceLoaderStorageEnabled' => $conf->get( 'ResourceLoaderStorageEnabled' ),
 129                         'wgForeignUploadTargets' => $conf->get( 'ForeignUploadTargets' ),
 130                         'wgEnableUploads' => $conf->get( 'EnableUploads' ),
 131                         'wgCommentByteLimit' => $oldCommentSchema ? 255 : null,
 132                         'wgCommentCodePointLimit' => $oldCommentSchema ? null : CommentStore::COMMENT_CHARACTER_LIMIT,
 133                 ];
 134
 135                 Hooks::run( 'ResourceLoaderGetConfigVars', [ &$vars ] );
 136
 137                 $this->configVars[$hash] = $vars;
 138                 return $this->configVars[$hash];
 139         }
 140
 141         /**
 142          * Recursively get all explicit and implicit dependencies for to the given module.
 143          *
 144          * @param array $registryData
 145          * @param string $moduleName
 146          * @return array
 147          */
 148         protected static function getImplicitDependencies( array $registryData, $moduleName ) {
 149                 static $dependencyCache = [];
 150
 151                 // The list of implicit dependencies won't be altered, so we can
 152                 // cache them without having to worry.
 153                 if ( !isset( $dependencyCache[$moduleName] ) ) {
 154                         if ( !isset( $registryData[$moduleName] ) ) {
 155                                 // Dependencies may not exist
 156                                 $dependencyCache[$moduleName] = [];
 157                         } else {
 158                                 $data = $registryData[$moduleName];
 159                                 $dependencyCache[$moduleName] = $data['dependencies'];
 160
 161                                 foreach ( $data['dependencies'] as $dependency ) {
 162                                         // Recursively get the dependencies of the dependencies
 163                                         $dependencyCache[$moduleName] = array_merge(
 164                                                 $dependencyCache[$moduleName],
 165                                                 self::getImplicitDependencies( $registryData, $dependency )
 166                                         );
 167                                 }
 168                         }
 169                 }
 170
 171                 return $dependencyCache[$moduleName];
 172         }
 173
 174         /**
 175          * Optimize the dependency tree in $this->modules.
 176          *
 177          * The optimization basically works like this:
 178          *      Given we have module A with the dependencies B and C
 179          *              and module B with the dependency C.
 180          *      Now we don't have to tell the client to explicitly fetch module
 181          *              C as that's already included in module B.
 182          *
 183          * This way we can reasonably reduce the amount of module registration
 184          * data send to the client.
 185          *
 186          * @param array &$registryData Modules keyed by name with properties:
 187          *  - string 'version'
 188          *  - array 'dependencies'
 189          *  - string|null 'group'
 190          *  - string 'source'
 191          */
 192         public static function compileUnresolvedDependencies( array &$registryData ) {
 193                 foreach ( $registryData as $name => &$data ) {
 194                         $dependencies = $data['dependencies'];
 195                         foreach ( $data['dependencies'] as $dependency ) {
 196                                 $implicitDependencies = self::getImplicitDependencies( $registryData, $dependency );
 197                                 $dependencies = array_diff( $dependencies, $implicitDependencies );
 198                         }
 199                         // Rebuild keys
 200                         $data['dependencies'] = array_values( $dependencies );
 201                 }
 202         }
 203
 204         /**
 205          * Get registration code for all modules.
 206          *
 207          * @param ResourceLoaderContext $context
 208          * @return string JavaScript code for registering all modules with the client loader
 209          */
 210         public function getModuleRegistrations( ResourceLoaderContext $context ) {
 211                 $resourceLoader = $context->getResourceLoader();
 212                 // Future developers: Use WebRequest::getRawVal() instead getVal().
 213                 // The getVal() method performs slow Language+UTF logic. (f303bb9360)
 214                 $target = $context->getRequest()->getRawVal( 'target', 'desktop' );
 215                 $safemode = $context->getRequest()->getRawVal( 'safemode' ) === '1';
 216                 // Bypass target filter if this request is Special:JavaScriptTest.
 217                 // To prevent misuse in production, this is only allowed if testing is enabled server-side.
 218                 $byPassTargetFilter = $this->getConfig()->get( 'EnableJavaScriptTest' ) && $target === 'test';
 219
 220                 $out = '';
 221                 $states = [];
 222                 $registryData = [];
 223
 224                 // Get registry data
 225                 foreach ( $resourceLoader->getModuleNames() as $name ) {
 226                         $module = $resourceLoader->getModule( $name );
 227                         $moduleTargets = $module->getTargets();
 228                         if (
 229                                 ( !$byPassTargetFilter && !in_array( $target, $moduleTargets ) )
 230                                 || ( $safemode && $module->getOrigin() > ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL )
 231                         ) {
 232                                 continue;
 233                         }
 234
 235                         if ( $module->isRaw() ) {
 236                                 // Don't register "raw" modules (like 'jquery' and 'mediawiki') client-side because
 237                                 // depending on them is illegal anyway and would only lead to them being reloaded
 238                                 // causing any state to be lost (like jQuery plugins, mw.config etc.)
 239                                 continue;
 240                         }
 241
 242                         try {
 243                                 $versionHash = $module->getVersionHash( $context );
 244                         } catch ( Exception $e ) {
 245                                 // See also T152266 and ResourceLoader::getCombinedVersion()
 246                                 MWExceptionHandler::logException( $e );
 247                                 $context->getLogger()->warning(
 248                                         'Calculating version for "{module}" failed: {exception}',
 249                                         [
 250                                                 'module' => $name,
 251                                                 'exception' => $e,
 252                                         ]
 253                                 );
 254                                 $versionHash = '';
 255                                 $states[$name] = 'error';
 256                         }
 257
 258                         if ( $versionHash !== '' && strlen( $versionHash ) !== 7 ) {
 259                                 $context->getLogger()->warning(
 260                                         "Module '{module}' produced an invalid version hash: '{version}'.",
 261                                         [
 262                                                 'module' => $name,
 263                                                 'version' => $versionHash,
 264                                         ]
 265                                 );
 266                                 // Module implementation either broken or deviated from ResourceLoader::makeHash
 267                                 // Asserted by tests/phpunit/structure/ResourcesTest.
 268                                 $versionHash = ResourceLoader::makeHash( $versionHash );
 269                         }
 270
 271                         $skipFunction = $module->getSkipFunction();
 272                         if ( $skipFunction !== null && !ResourceLoader::inDebugMode() ) {
 273                                 $skipFunction = ResourceLoader::filter( 'minify-js', $skipFunction );
 274                         }
 275
 276                         $registryData[$name] = [
 277                                 'version' => $versionHash,
 278                                 'dependencies' => $module->getDependencies( $context ),
 279                                 'group' => $module->getGroup(),
 280                                 'source' => $module->getSource(),
 281                                 'skip' => $skipFunction,
 282                         ];
 283                 }
 284
 285                 self::compileUnresolvedDependencies( $registryData );
 286
 287                 // Register sources
 288                 $out .= ResourceLoader::makeLoaderSourcesScript( $resourceLoader->getSources() );
 289
 290                 // Figure out the different call signatures for mw.loader.register
 291                 $registrations = [];
 292                 foreach ( $registryData as $name => $data ) {
 293                         // Call mw.loader.register(name, version, dependencies, group, source, skip)
 294                         $registrations[] = [
 295                                 $name,
 296                                 $data['version'],
 297                                 $data['dependencies'],
 298                                 $data['group'],
 299                                 // Swap default (local) for null
 300                                 $data['source'] === 'local' ? null : $data['source'],
 301                                 $data['skip']
 302                         ];
 303                 }
 304
 305                 // Register modules
 306                 $out .= "\n" . ResourceLoader::makeLoaderRegisterScript( $registrations );
 307
 308                 if ( $states ) {
 309                         $out .= "\n" . ResourceLoader::makeLoaderStateScript( $states );
 310                 }
 311
 312                 return $out;
 313         }
 314
 315         /**
 316          * @return bool
 317          */
 318         public function isRaw() {
 319                 return true;
 320         }
 321
 322         /**
 323          * @param ResourceLoaderContext $context
 324          * @return array
 325          */
 326         public function getPreloadLinks( ResourceLoaderContext $context ) {
 327                 $url = self::getStartupModulesUrl( $context );
 328                 return [
 329                         $url => [ 'as' => 'script' ]
 330                 ];
 331         }
 332
 333         /**
 334          * Base modules required for the base environment of ResourceLoader
 335          *
 336          * @return array
 337          */
 338         public static function getStartupModules() {
 339                 return [ 'jquery', 'mediawiki' ];
 340         }
 341
 342         public static function getLegacyModules() {
 343                 global $wgIncludeLegacyJavaScript;
 344
 345                 $legacyModules = [];
 346                 if ( $wgIncludeLegacyJavaScript ) {
 347                         $legacyModules[] = 'mediawiki.legacy.wikibits';
 348                 }
 349
 350                 return $legacyModules;
 351         }
 352
 353         /**
 354          * Get the load URL of the startup modules.
 355          *
 356          * This is a helper for getScript(), but can also be called standalone, such
 357          * as when generating an AppCache manifest.
 358          *
 359          * @param ResourceLoaderContext $context
 360          * @return string
 361          */
 362         public static function getStartupModulesUrl( ResourceLoaderContext $context ) {
 363                 $rl = $context->getResourceLoader();
 364                 $derivative = new DerivativeResourceLoaderContext( $context );
 365                 $derivative->setModules( array_merge(
 366                         self::getStartupModules(),
 367                         self::getLegacyModules()
 368                 ) );
 369                 $derivative->setOnly( 'scripts' );
 370                 // Must setModules() before makeVersionQuery()
 371                 $derivative->setVersion( $rl->makeVersionQuery( $derivative ) );
 372
 373                 return $rl->createLoaderURL( 'local', $derivative );
 374         }
 375
 376         /**
 377          * @param ResourceLoaderContext $context
 378          * @return string JavaScript code
 379          */
 380         public function getScript( ResourceLoaderContext $context ) {
 381                 global $IP;
 382                 if ( $context->getOnly() !== 'scripts' ) {
 383                         return '/* Requires only=script */';
 384                 }
 385
 386                 $out = file_get_contents( "$IP/resources/src/startup.js" );
 387
 388                 $pairs = array_map( function ( $value ) {
 389                         $value = FormatJson::encode( $value, ResourceLoader::inDebugMode(), FormatJson::ALL_OK );
 390                         // Fix indentation
 391                         $value = str_replace( "\n", "\n\t", $value );
 392                         return $value;
 393                 }, [
 394                         '$VARS.wgLegacyJavaScriptGlobals' => $this->getConfig()->get( 'LegacyJavaScriptGlobals' ),
 395                         '$VARS.configuration' => $this->getConfigSettings( $context ),
 396                         // This url may be preloaded. See getPreloadLinks().
 397                         '$VARS.baseModulesUri' => self::getStartupModulesUrl( $context ),
 398                 ] );
 399                 $pairs['$CODE.registrations()'] = str_replace(
 400                         "\n",
 401                         "\n\t",
 402                         trim( $this->getModuleRegistrations( $context ) )
 403                 );
 404
 405                 return strtr( $out, $pairs );
 406         }
 407
 408         /**
 409          * @return bool
 410          */
 411         public function supportsURLLoading() {
 412                 return false;
 413         }
 414
 415         /**
 416          * Get the definition summary for this module.
 417          *
 418          * @param ResourceLoaderContext $context
 419          * @return array
 420          */
 421         public function getDefinitionSummary( ResourceLoaderContext $context ) {
 422                 global $IP;
 423                 $summary = parent::getDefinitionSummary( $context );
 424                 $summary[] = [
 425                         // Detect changes to variables exposed in mw.config (T30899).
 426                         'vars' => $this->getConfigSettings( $context ),
 427                         // Changes how getScript() creates mw.Map for mw.config
 428                         'wgLegacyJavaScriptGlobals' => $this->getConfig()->get( 'LegacyJavaScriptGlobals' ),
 429                         // Detect changes to the module registrations
 430                         'moduleHashes' => $this->getAllModuleHashes( $context ),
 431
 432                         'fileMtimes' => [
 433                                 filemtime( "$IP/resources/src/startup.js" ),
 434                         ],
 435                 ];
 436                 return $summary;
 437         }
 438
 439         /**
 440          * Helper method for getDefinitionSummary().
 441          *
 442          * @param ResourceLoaderContext $context
 443          * @return string SHA-1
 444          */
 445         protected function getAllModuleHashes( ResourceLoaderContext $context ) {
 446                 $rl = $context->getResourceLoader();
 447                 // Preload for getCombinedVersion()
 448                 $rl->preloadModuleInfo( $rl->getModuleNames(), $context );
 449
 450                 // ATTENTION: Because of the line below, this is not going to cause infinite recursion.
 451                 // Think carefully before making changes to this code!
 452                 // Pre-populate versionHash with something because the loop over all modules below includes
 453                 // the startup module (this module).
 454                 // See ResourceLoaderModule::getVersionHash() for usage of this cache.
 455                 $this->versionHash[$context->getHash()] = null;
 456
 457                 return $rl->getCombinedVersion( $context, $rl->getModuleNames() );
 458         }
 459
 460         /**
 461          * @return string
 462          */
 463         public function getGroup() {
 464                 return 'startup';
 465         }
 466 }