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 use MediaWiki\MediaWikiServices;
  24
  25 /**
  26  * Module for ResourceLoader initialization.
  27  *
  28  * See also <https://www.mediawiki.org/wiki/ResourceLoader/Features#Startup_Module>
  29  *
  30  * The startup module, as being called only from ResourceLoaderClientHtml, has
  31  * the ability to vary based extra query parameters, in addition to those
  32  * from ResourceLoaderContext:
  33  *
  34  * - target: Only register modules in the client intended for this target.
  35  *   Default: "desktop".
  36  *   See also: OutputPage::setTarget(), ResourceLoaderModule::getTargets().
  37  *
  38  * - safemode: Only register modules that have ORIGIN_CORE as their origin.
  39  *   This effectively disables ORIGIN_USER modules. (T185303)
  40  *   See also: OutputPage::disallowUserJs()
  41  */
  42 class ResourceLoaderStartUpModule extends ResourceLoaderModule {
  43         protected $targets = [ 'desktop', 'mobile' ];
  44
  45         /**
  46          * @param ResourceLoaderContext $context
  47          * @return array
  48          */
  49         private function getConfigSettings( $context ) {
  50                 $conf = $this->getConfig();
  51
  52                 /**
  53                  * Namespace related preparation
  54                  * - wgNamespaceIds: Key-value pairs of all localized, canonical and aliases for namespaces.
  55                  * - wgCaseSensitiveNamespaces: Array of namespaces that are case-sensitive.
  56                  */
  57                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
  58                 $namespaceIds = $contLang->getNamespaceIds();
  59                 $caseSensitiveNamespaces = [];
  60                 $nsInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
  61                 foreach ( $nsInfo->getCanonicalNamespaces() as $index => $name ) {
  62                         $namespaceIds[$contLang->lc( $name )] = $index;
  63                         if ( !$nsInfo->isCapitalized( $index ) ) {
  64                                 $caseSensitiveNamespaces[] = $index;
  65                         }
  66                 }
  67
  68                 $illegalFileChars = $conf->get( 'IllegalFileChars' );
  69
  70                 // Build list of variables
  71                 $skin = $context->getSkin();
  72                 $vars = [
  73                         'wgLoadScript' => $conf->get( 'LoadScript' ),
  74                         'debug' => $context->getDebug(),
  75                         'skin' => $skin,
  76                         'stylepath' => $conf->get( 'StylePath' ),
  77                         'wgUrlProtocols' => wfUrlProtocols(),
  78                         'wgArticlePath' => $conf->get( 'ArticlePath' ),
  79                         'wgScriptPath' => $conf->get( 'ScriptPath' ),
  80                         'wgScript' => $conf->get( 'Script' ),
  81                         'wgSearchType' => $conf->get( 'SearchType' ),
  82                         'wgVariantArticlePath' => $conf->get( 'VariantArticlePath' ),
  83                         // Force object to avoid "empty" associative array from
  84                         // becoming [] instead of {} in JS (T36604)
  85                         'wgActionPaths' => (object)$conf->get( 'ActionPaths' ),
  86                         'wgServer' => $conf->get( 'Server' ),
  87                         'wgServerName' => $conf->get( 'ServerName' ),
  88                         'wgUserLanguage' => $context->getLanguage(),
  89                         'wgContentLanguage' => $contLang->getCode(),
  90                         'wgTranslateNumerals' => $conf->get( 'TranslateNumerals' ),
  91                         'wgVersion' => $conf->get( 'Version' ),
  92                         'wgEnableAPI' => true, // Deprecated since MW 1.32
  93                         'wgEnableWriteAPI' => true, // Deprecated since MW 1.32
  94                         'wgFormattedNamespaces' => $contLang->getFormattedNamespaces(),
  95                         'wgNamespaceIds' => $namespaceIds,
  96                         'wgContentNamespaces' => $nsInfo->getContentNamespaces(),
  97                         'wgSiteName' => $conf->get( 'Sitename' ),
  98                         'wgDBname' => $conf->get( 'DBname' ),
  99                         'wgExtraSignatureNamespaces' => $conf->get( 'ExtraSignatureNamespaces' ),
 100                         'wgExtensionAssetsPath' => $conf->get( 'ExtensionAssetsPath' ),
 101                         // MediaWiki sets cookies to have this prefix by default
 102                         'wgCookiePrefix' => $conf->get( 'CookiePrefix' ),
 103                         'wgCookieDomain' => $conf->get( 'CookieDomain' ),
 104                         'wgCookiePath' => $conf->get( 'CookiePath' ),
 105                         'wgCookieExpiration' => $conf->get( 'CookieExpiration' ),
 106                         'wgCaseSensitiveNamespaces' => $caseSensitiveNamespaces,
 107                         'wgLegalTitleChars' => Title::convertByteClassToUnicodeClass( Title::legalChars() ),
 108                         'wgIllegalFileChars' => Title::convertByteClassToUnicodeClass( $illegalFileChars ),
 109                         'wgResourceLoaderStorageVersion' => $conf->get( 'ResourceLoaderStorageVersion' ),
 110                         'wgResourceLoaderStorageEnabled' => $conf->get( 'ResourceLoaderStorageEnabled' ),
 111                         'wgForeignUploadTargets' => $conf->get( 'ForeignUploadTargets' ),
 112                         'wgEnableUploads' => $conf->get( 'EnableUploads' ),
 113                         'wgCommentByteLimit' => null,
 114                         'wgCommentCodePointLimit' => CommentStore::COMMENT_CHARACTER_LIMIT,
 115                 ];
 116
 117                 Hooks::run( 'ResourceLoaderGetConfigVars', [ &$vars, $skin ] );
 118
 119                 return $vars;
 120         }
 121
 122         /**
 123          * Recursively get all explicit and implicit dependencies for to the given module.
 124          *
 125          * @param array $registryData
 126          * @param string $moduleName
 127          * @return array
 128          */
 129         protected static function getImplicitDependencies( array $registryData, $moduleName ) {
 130                 static $dependencyCache = [];
 131
 132                 // The list of implicit dependencies won't be altered, so we can
 133                 // cache them without having to worry.
 134                 if ( !isset( $dependencyCache[$moduleName] ) ) {
 135                         if ( !isset( $registryData[$moduleName] ) ) {
 136                                 // Dependencies may not exist
 137                                 $dependencyCache[$moduleName] = [];
 138                         } else {
 139                                 $data = $registryData[$moduleName];
 140                                 $dependencyCache[$moduleName] = $data['dependencies'];
 141
 142                                 foreach ( $data['dependencies'] as $dependency ) {
 143                                         // Recursively get the dependencies of the dependencies
 144                                         $dependencyCache[$moduleName] = array_merge(
 145                                                 $dependencyCache[$moduleName],
 146                                                 self::getImplicitDependencies( $registryData, $dependency )
 147                                         );
 148                                 }
 149                         }
 150                 }
 151
 152                 return $dependencyCache[$moduleName];
 153         }
 154
 155         /**
 156          * Optimize the dependency tree in $this->modules.
 157          *
 158          * The optimization basically works like this:
 159          *      Given we have module A with the dependencies B and C
 160          *              and module B with the dependency C.
 161          *      Now we don't have to tell the client to explicitly fetch module
 162          *              C as that's already included in module B.
 163          *
 164          * This way we can reasonably reduce the amount of module registration
 165          * data send to the client.
 166          *
 167          * @param array &$registryData Modules keyed by name with properties:
 168          *  - string 'version'
 169          *  - array 'dependencies'
 170          *  - string|null 'group'
 171          *  - string 'source'
 172          */
 173         public static function compileUnresolvedDependencies( array &$registryData ) {
 174                 foreach ( $registryData as $name => &$data ) {
 175                         $dependencies = $data['dependencies'];
 176                         foreach ( $data['dependencies'] as $dependency ) {
 177                                 $implicitDependencies = self::getImplicitDependencies( $registryData, $dependency );
 178                                 $dependencies = array_diff( $dependencies, $implicitDependencies );
 179                         }
 180                         // Rebuild keys
 181                         $data['dependencies'] = array_values( $dependencies );
 182                 }
 183         }
 184
 185         /**
 186          * Get registration code for all modules.
 187          *
 188          * @param ResourceLoaderContext $context
 189          * @return string JavaScript code for registering all modules with the client loader
 190          */
 191         public function getModuleRegistrations( ResourceLoaderContext $context ) {
 192                 $resourceLoader = $context->getResourceLoader();
 193                 // Future developers: Use WebRequest::getRawVal() instead getVal().
 194                 // The getVal() method performs slow Language+UTF logic. (f303bb9360)
 195                 $target = $context->getRequest()->getRawVal( 'target', 'desktop' );
 196                 $safemode = $context->getRequest()->getRawVal( 'safemode' ) === '1';
 197                 // Bypass target filter if this request is Special:JavaScriptTest.
 198                 // To prevent misuse in production, this is only allowed if testing is enabled server-side.
 199                 $byPassTargetFilter = $this->getConfig()->get( 'EnableJavaScriptTest' ) && $target === 'test';
 200
 201                 $out = '';
 202                 $states = [];
 203                 $registryData = [];
 204                 $moduleNames = $resourceLoader->getModuleNames();
 205
 206                 // Preload with a batch so that the below calls to getVersionHash() for each module
 207                 // don't require on-demand loading of more information.
 208                 try {
 209                         $resourceLoader->preloadModuleInfo( $moduleNames, $context );
 210                 } catch ( Exception $e ) {
 211                         // Don't fail the request (T152266)
 212                         // Also print the error in the main output
 213                         $resourceLoader->outputErrorAndLog( $e,
 214                                 'Preloading module info from startup failed: {exception}',
 215                                 [ 'exception' => $e ]
 216                         );
 217                 }
 218
 219                 // Get registry data
 220                 foreach ( $moduleNames as $name ) {
 221                         $module = $resourceLoader->getModule( $name );
 222                         $moduleTargets = $module->getTargets();
 223                         if (
 224                                 ( !$byPassTargetFilter && !in_array( $target, $moduleTargets ) )
 225                                 || ( $safemode && $module->getOrigin() > ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL )
 226                         ) {
 227                                 continue;
 228                         }
 229
 230                         if ( $module->isRaw() ) {
 231                                 // Don't register "raw" modules (like 'startup') client-side because depending on them
 232                                 // is illegal anyway and would only lead to them being loaded a second time,
 233                                 // causing any state to be lost.
 234
 235                                 // ATTENTION: Because of the line below, this is not going to cause infinite recursion.
 236                                 // Think carefully before making changes to this code!
 237                                 // The below code is going to call ResourceLoaderModule::getVersionHash() for every module.
 238                                 // For StartUpModule (this module) the hash is computed based on the manifest content,
 239                                 // which is the very thing we are computing right here. As such, this must skip iterating
 240                                 // over 'startup' itself.
 241                                 continue;
 242                         }
 243
 244                         try {
 245                                 $versionHash = $module->getVersionHash( $context );
 246                         } catch ( Exception $e ) {
 247                                 // Don't fail the request (T152266)
 248                                 // Also print the error in the main output
 249                                 $resourceLoader->outputErrorAndLog( $e,
 250                                         'Calculating version for "{module}" failed: {exception}',
 251                                         [
 252                                                 'module' => $name,
 253                                                 'exception' => $e,
 254                                         ]
 255                                 );
 256                                 $versionHash = '';
 257                                 $states[$name] = 'error';
 258                         }
 259
 260                         if ( $versionHash !== '' && strlen( $versionHash ) !== 7 ) {
 261                                 $this->getLogger()->warning(
 262                                         "Module '{module}' produced an invalid version hash: '{version}'.",
 263                                         [
 264                                                 'module' => $name,
 265                                                 'version' => $versionHash,
 266                                         ]
 267                                 );
 268                                 // Module implementation either broken or deviated from ResourceLoader::makeHash
 269                                 // Asserted by tests/phpunit/structure/ResourcesTest.
 270                                 $versionHash = ResourceLoader::makeHash( $versionHash );
 271                         }
 272
 273                         $skipFunction = $module->getSkipFunction();
 274                         if ( $skipFunction !== null && !ResourceLoader::inDebugMode() ) {
 275                                 $skipFunction = ResourceLoader::filter( 'minify-js', $skipFunction );
 276                         }
 277
 278                         $registryData[$name] = [
 279                                 'version' => $versionHash,
 280                                 'dependencies' => $module->getDependencies( $context ),
 281                                 'group' => $module->getGroup(),
 282                                 'source' => $module->getSource(),
 283                                 'skip' => $skipFunction,
 284                         ];
 285                 }
 286
 287                 self::compileUnresolvedDependencies( $registryData );
 288
 289                 // Register sources
 290                 $out .= ResourceLoader::makeLoaderSourcesScript( $resourceLoader->getSources() );
 291
 292                 // Figure out the different call signatures for mw.loader.register
 293                 $registrations = [];
 294                 foreach ( $registryData as $name => $data ) {
 295                         // Call mw.loader.register(name, version, dependencies, group, source, skip)
 296                         $registrations[] = [
 297                                 $name,
 298                                 $data['version'],
 299                                 $data['dependencies'],
 300                                 $data['group'],
 301                                 // Swap default (local) for null
 302                                 $data['source'] === 'local' ? null : $data['source'],
 303                                 $data['skip']
 304                         ];
 305                 }
 306
 307                 // Register modules
 308                 $out .= "\n" . ResourceLoader::makeLoaderRegisterScript( $registrations );
 309
 310                 if ( $states ) {
 311                         $out .= "\n" . ResourceLoader::makeLoaderStateScript( $states );
 312                 }
 313
 314                 return $out;
 315         }
 316
 317         /**
 318          * @return bool
 319          */
 320         public function isRaw() {
 321                 return true;
 322         }
 323
 324         /**
 325          * @private For internal use by SpecialJavaScriptTest
 326          * @since 1.32
 327          * @return array
 328          */
 329         public function getBaseModulesInternal() {
 330                 return $this->getBaseModules();
 331         }
 332
 333         /**
 334          * Base modules implicitly available to all modules.
 335          *
 336          * @return array
 337          */
 338         private function getBaseModules() {
 339                 global $wgIncludeLegacyJavaScript;
 340
 341                 $baseModules = [ 'jquery', 'mediawiki.base' ];
 342                 if ( $wgIncludeLegacyJavaScript ) {
 343                         $baseModules[] = 'mediawiki.legacy.wikibits';
 344                 }
 345
 346                 return $baseModules;
 347         }
 348
 349         /**
 350          * @param ResourceLoaderContext $context
 351          * @return string JavaScript code
 352          */
 353         public function getScript( ResourceLoaderContext $context ) {
 354                 global $IP;
 355                 $conf = $this->getConfig();
 356
 357                 if ( $context->getOnly() !== 'scripts' ) {
 358                         return '/* Requires only=script */';
 359                 }
 360
 361                 $startupCode = file_get_contents( "$IP/resources/src/startup/startup.js" );
 362
 363                 // The files read here MUST be kept in sync with maintenance/jsduck/eg-iframe.html,
 364                 // and MUST be considered by 'fileHashes' in StartUpModule::getDefinitionSummary().
 365                 $mwLoaderCode = file_get_contents( "$IP/resources/src/startup/mediawiki.js" ) .
 366                         file_get_contents( "$IP/resources/src/startup/mediawiki.requestIdleCallback.js" );
 367                 if ( $context->getDebug() ) {
 368                         $mwLoaderCode .= file_get_contents( "$IP/resources/src/startup/mediawiki.log.js" );
 369                 }
 370                 if ( $conf->get( 'ResourceLoaderEnableJSProfiler' ) ) {
 371                         $mwLoaderCode .= file_get_contents( "$IP/resources/src/startup/profiler.js" );
 372                 }
 373
 374                 // Perform replacements for mediawiki.js
 375                 $mwLoaderPairs = [
 376                         '$VARS.baseModules' => ResourceLoader::encodeJsonForScript( $this->getBaseModules() ),
 377                         '$VARS.maxQueryLength' => ResourceLoader::encodeJsonForScript(
 378                                 $conf->get( 'ResourceLoaderMaxQueryLength' )
 379                         ),
 380                 ];
 381                 $profilerStubs = [
 382                         '$CODE.profileExecuteStart();' => 'mw.loader.profiler.onExecuteStart( module );',
 383                         '$CODE.profileExecuteEnd();' => 'mw.loader.profiler.onExecuteEnd( module );',
 384                         '$CODE.profileScriptStart();' => 'mw.loader.profiler.onScriptStart( module );',
 385                         '$CODE.profileScriptEnd();' => 'mw.loader.profiler.onScriptEnd( module );',
 386                 ];
 387                 if ( $conf->get( 'ResourceLoaderEnableJSProfiler' ) ) {
 388                         // When profiling is enabled, insert the calls.
 389                         $mwLoaderPairs += $profilerStubs;
 390                 } else {
 391                         // When disabled (by default), insert nothing.
 392                         $mwLoaderPairs += array_fill_keys( array_keys( $profilerStubs ), '' );
 393                 }
 394                 $mwLoaderCode = strtr( $mwLoaderCode, $mwLoaderPairs );
 395
 396                 // Perform string replacements for startup.js
 397                 $pairs = [
 398                         '$VARS.wgLegacyJavaScriptGlobals' => ResourceLoader::encodeJsonForScript(
 399                                 $conf->get( 'LegacyJavaScriptGlobals' )
 400                         ),
 401                         '$VARS.configuration' => ResourceLoader::encodeJsonForScript(
 402                                 $this->getConfigSettings( $context )
 403                         ),
 404                         // Raw JavaScript code (not JSON)
 405                         '$CODE.registrations();' => trim( $this->getModuleRegistrations( $context ) ),
 406                         '$CODE.defineLoader();' => $mwLoaderCode,
 407                 ];
 408                 $startupCode = strtr( $startupCode, $pairs );
 409
 410                 return $startupCode;
 411         }
 412
 413         /**
 414          * @return bool
 415          */
 416         public function supportsURLLoading() {
 417                 return false;
 418         }
 419
 420         /**
 421          * @return bool
 422          */
 423         public function enableModuleContentVersion() {
 424                 // Enabling this means that ResourceLoader::getVersionHash will simply call getScript()
 425                 // and hash it to determine the version (as used by E-Tag HTTP response header).
 426                 return true;
 427         }
 428
 429         /**
 430          * @return string
 431          */
 432         public function getGroup() {
 433                 return 'startup';
 434         }
 435 }