includes/resourceloader/ResourceLoaderStartUpModule.php

   1 <?php
   2 /**
   3  * Module for resource loader initialization.
   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 class ResourceLoaderStartUpModule extends ResourceLoaderModule {
  26
  27         /* Protected Members */
  28
  29         protected $modifiedTime = array();
  30         protected $configVars = array();
  31         protected $targets = array( 'desktop', 'mobile' );
  32
  33         /* Protected Methods */
  34
  35         /**
  36          * @param ResourceLoaderContext $context
  37          * @return array
  38          */
  39         protected function getConfigSettings( $context ) {
  40
  41                 $hash = $context->getHash();
  42                 if ( isset( $this->configVars[$hash] ) ) {
  43                         return $this->configVars[$hash];
  44                 }
  45
  46                 global $wgContLang;
  47
  48                 $mainPage = Title::newMainPage();
  49
  50                 /**
  51                  * Namespace related preparation
  52                  * - wgNamespaceIds: Key-value pairs of all localized, canonical and aliases for namespaces.
  53                  * - wgCaseSensitiveNamespaces: Array of namespaces that are case-sensitive.
  54                  */
  55                 $namespaceIds = $wgContLang->getNamespaceIds();
  56                 $caseSensitiveNamespaces = array();
  57                 foreach ( MWNamespace::getCanonicalNamespaces() as $index => $name ) {
  58                         $namespaceIds[$wgContLang->lc( $name )] = $index;
  59                         if ( !MWNamespace::isCapitalized( $index ) ) {
  60                                 $caseSensitiveNamespaces[] = $index;
  61                         }
  62                 }
  63
  64                 $conf = $this->getConfig();
  65                 // Build list of variables
  66                 $vars = array(
  67                         'wgLoadScript' => wfScript( 'load' ),
  68                         'debug' => $context->getDebug(),
  69                         'skin' => $context->getSkin(),
  70                         'stylepath' => $conf->get( 'StylePath' ),
  71                         'wgUrlProtocols' => wfUrlProtocols(),
  72                         'wgArticlePath' => $conf->get( 'ArticlePath' ),
  73                         'wgScriptPath' => $conf->get( 'ScriptPath' ),
  74                         'wgScriptExtension' => $conf->get( 'ScriptExtension' ),
  75                         'wgScript' => wfScript(),
  76                         'wgSearchType' => $conf->get( 'SearchType' ),
  77                         'wgVariantArticlePath' => $conf->get( 'VariantArticlePath' ),
  78                         // Force object to avoid "empty" associative array from
  79                         // becoming [] instead of {} in JS (bug 34604)
  80                         'wgActionPaths' => (object)$conf->get( 'ActionPaths' ),
  81                         'wgServer' => $conf->get( 'Server' ),
  82                         'wgServerName' => $conf->get( 'ServerName' ),
  83                         'wgUserLanguage' => $context->getLanguage(),
  84                         'wgContentLanguage' => $wgContLang->getCode(),
  85                         'wgVersion' => $conf->get( 'Version' ),
  86                         'wgEnableAPI' => $conf->get( 'EnableAPI' ),
  87                         'wgEnableWriteAPI' => $conf->get( 'EnableWriteAPI' ),
  88                         'wgMainPageTitle' => $mainPage->getPrefixedText(),
  89                         'wgFormattedNamespaces' => $wgContLang->getFormattedNamespaces(),
  90                         'wgNamespaceIds' => $namespaceIds,
  91                         'wgContentNamespaces' => MWNamespace::getContentNamespaces(),
  92                         'wgSiteName' => $conf->get( 'Sitename' ),
  93                         'wgFileExtensions' => array_values( array_unique( $conf->get( 'FileExtensions' ) ) ),
  94                         'wgDBname' => $conf->get( 'DBname' ),
  95                         // This sucks, it is only needed on Special:Upload, but I could
  96                         // not find a way to add vars only for a certain module
  97                         'wgFileCanRotate' => BitmapHandler::canRotate(),
  98                         'wgAvailableSkins' => Skin::getSkinNames(),
  99                         'wgExtensionAssetsPath' => $conf->get( 'ExtensionAssetsPath' ),
 100                         // MediaWiki sets cookies to have this prefix by default
 101                         'wgCookiePrefix' => $conf->get( 'CookiePrefix' ),
 102                         'wgCookieDomain' => $conf->get( 'CookieDomain' ),
 103                         'wgCookiePath' => $conf->get( 'CookiePath' ),
 104                         'wgCookieExpiration' => $conf->get( 'CookieExpiration' ),
 105                         'wgResourceLoaderMaxQueryLength' => $conf->get( 'ResourceLoaderMaxQueryLength' ),
 106                         'wgCaseSensitiveNamespaces' => $caseSensitiveNamespaces,
 107                         'wgLegalTitleChars' => Title::convertByteClassToUnicodeClass( Title::legalChars() ),
 108                         'wgResourceLoaderStorageVersion' => $conf->get( 'ResourceLoaderStorageVersion' ),
 109                         'wgResourceLoaderStorageEnabled' => $conf->get( 'ResourceLoaderStorageEnabled' ),
 110                 );
 111
 112                 wfRunHooks( 'ResourceLoaderGetConfigVars', array( &$vars ) );
 113
 114                 $this->configVars[$hash] = $vars;
 115                 return $this->configVars[$hash];
 116         }
 117
 118         /**
 119          * Recursively get all explicit and implicit dependencies for to the given module.
 120          *
 121          * @param array $registryData
 122          * @param string $moduleName
 123          * @return array
 124          */
 125         protected static function getImplicitDependencies( Array $registryData, $moduleName ) {
 126                 static $dependencyCache = array();
 127
 128                 // The list of implicit dependencies won't be altered, so we can
 129                 // cache them without having to worry.
 130                 if ( !isset( $dependencyCache[$moduleName] ) ) {
 131
 132                         if ( !isset( $registryData[$moduleName] ) ) {
 133                                 // Dependencies may not exist
 134                                 $dependencyCache[$moduleName] = array();
 135                         } else {
 136                                 $data = $registryData[$moduleName];
 137                                 $dependencyCache[$moduleName] = $data['dependencies'];
 138
 139                                 foreach ( $data['dependencies'] as $dependency ) {
 140                                         // Recursively get the dependencies of the dependencies
 141                                         $dependencyCache[$moduleName] = array_merge(
 142                                                 $dependencyCache[$moduleName],
 143                                                 self::getImplicitDependencies( $registryData, $dependency )
 144                                         );
 145                                 }
 146                         }
 147                 }
 148
 149                 return $dependencyCache[$moduleName];
 150         }
 151
 152         /**
 153          * Optimize the dependency tree in $this->modules and return it.
 154          *
 155          * The optimization basically works like this:
 156          *      Given we have module A with the dependencies B and C
 157          *              and module B with the dependency C.
 158          *      Now we don't have to tell the client to explicitly fetch module
 159          *              C as that's already included in module B.
 160          *
 161          * This way we can reasonably reduce the amout of module registration
 162          * data send to the client.
 163          *
 164          * @param array &$registryData Modules keyed by name with properties:
 165          *  - string 'version'
 166          *  - array 'dependencies'
 167          *  - string|null 'group'
 168          *  - string 'source'
 169          *  - string|false 'loader'
 170          */
 171         public static function compileUnresolvedDependencies( Array &$registryData ) {
 172                 foreach ( $registryData as $name => &$data ) {
 173                         if ( $data['loader'] !== false ) {
 174                                 continue;
 175                         }
 176                         $dependencies = $data['dependencies'];
 177                         foreach ( $data['dependencies'] as $dependency ) {
 178                                 $implicitDependencies = self::getImplicitDependencies( $registryData, $dependency );
 179                                 $dependencies = array_diff( $dependencies, $implicitDependencies );
 180                         }
 181                         // Rebuild keys
 182                         $data['dependencies'] = array_values( $dependencies );
 183                 }
 184         }
 185
 186
 187         /**
 188          * Get registration code for all modules.
 189          *
 190          * @param ResourceLoaderContext $context
 191          * @return string JavaScript code for registering all modules with the client loader
 192          */
 193         public function getModuleRegistrations( ResourceLoaderContext $context ) {
 194                 wfProfileIn( __METHOD__ );
 195
 196                 $resourceLoader = $context->getResourceLoader();
 197                 $target = $context->getRequest()->getVal( 'target', 'desktop' );
 198
 199                 $out = '';
 200                 $registryData = array();
 201
 202                 // Get registry data
 203                 foreach ( $resourceLoader->getModuleNames() as $name ) {
 204                         $module = $resourceLoader->getModule( $name );
 205                         $moduleTargets = $module->getTargets();
 206                         if ( !in_array( $target, $moduleTargets ) ) {
 207                                 continue;
 208                         }
 209
 210                         // getModifiedTime() is supposed to return a UNIX timestamp, but it doesn't always
 211                         // seem to do that, and custom implementations might forget. Coerce it to TS_UNIX
 212                         $moduleMtime = wfTimestamp( TS_UNIX, $module->getModifiedTime( $context ) );
 213                         $mtime = max( $moduleMtime, wfTimestamp( TS_UNIX, $this->getConfig()->get( 'CacheEpoch' ) ) );
 214
 215                         // FIXME: Convert to numbers, wfTimestamp always gives us stings, even for TS_UNIX
 216
 217                         $skipFunction = $module->getSkipFunction();
 218                         if ( $skipFunction !== null && !ResourceLoader::inDebugMode() ) {
 219                                 $skipFunction = $resourceLoader->filter( 'minify-js',
 220                                         $skipFunction,
 221                                         // There will potentially be lots of these little string in the registrations
 222                                         // manifest, we don't want to blow up the startup module with
 223                                         // "/* cache key: ... */" all over it in non-debug mode.
 224                                         /* cacheReport = */ false
 225                                 );
 226                         }
 227
 228                         $registryData[$name] = array(
 229                                 'version' => $mtime,
 230                                 'dependencies' => $module->getDependencies(),
 231                                 'group' => $module->getGroup(),
 232                                 'source' => $module->getSource(),
 233                                 'loader' => $module->getLoaderScript(),
 234                                 'skip' => $skipFunction,
 235                         );
 236                 }
 237
 238                 self::compileUnresolvedDependencies( $registryData );
 239
 240                 // Register sources
 241                 $out .= ResourceLoader::makeLoaderSourcesScript( $resourceLoader->getSources() );
 242
 243                 // Concatenate module loader scripts and figure out the different call
 244                 // signatures for mw.loader.register
 245                 $registrations = array();
 246                 foreach ( $registryData as $name => $data ) {
 247                         if ( $data['loader'] !== false ) {
 248                                 $out .= ResourceLoader::makeCustomLoaderScript(
 249                                         $name,
 250                                         wfTimestamp( TS_ISO_8601_BASIC, $data['version'] ),
 251                                         $data['dependencies'],
 252                                         $data['group'],
 253                                         $data['source'],
 254                                         $data['loader']
 255                                 );
 256                                 continue;
 257                         }
 258
 259                         if (
 260                                 !count( $data['dependencies'] ) &&
 261                                 $data['group'] === null &&
 262                                 $data['source'] === 'local' &&
 263                                 $data['skip'] === null
 264                         ) {
 265                                 // Modules with no dependencies, group, foreign source or skip function;
 266                                 // call mw.loader.register(name, timestamp)
 267                                 $registrations[] = array( $name, $data['version'] );
 268                         } elseif (
 269                                 $data['group'] === null &&
 270                                 $data['source'] === 'local' &&
 271                                 $data['skip'] === null
 272                         ) {
 273                                 // Modules with dependencies but no group, foreign source or skip function;
 274                                 // call mw.loader.register(name, timestamp, dependencies)
 275                                 $registrations[] = array( $name, $data['version'], $data['dependencies'] );
 276                         } elseif (
 277                                 $data['source'] === 'local' &&
 278                                 $data['skip'] === null
 279                         ) {
 280                                 // Modules with a group but no foreign source or skip function;
 281                                 // call mw.loader.register(name, timestamp, dependencies, group)
 282                                 $registrations[] = array(
 283                                         $name,
 284                                         $data['version'],
 285                                         $data['dependencies'],
 286                                         $data['group']
 287                                 );
 288                         } elseif ( $data['skip'] === null ) {
 289                                 // Modules with a foreign source but no skip function;
 290                                 // call mw.loader.register(name, timestamp, dependencies, group, source)
 291                                 $registrations[] = array(
 292                                         $name,
 293                                         $data['version'],
 294                                         $data['dependencies'],
 295                                         $data['group'],
 296                                         $data['source']
 297                                 );
 298                         } else {
 299                                 // Modules with a skip function;
 300                                 // call mw.loader.register(name, timestamp, dependencies, group, source, skip)
 301                                 $registrations[] = array(
 302                                         $name,
 303                                         $data['version'],
 304                                         $data['dependencies'],
 305                                         $data['group'],
 306                                         $data['source'],
 307                                         $data['skip']
 308                                 );
 309                         }
 310                 }
 311
 312                 // Register modules
 313                 $out .= ResourceLoader::makeLoaderRegisterScript( $registrations );
 314
 315                 wfProfileOut( __METHOD__ );
 316                 return $out;
 317         }
 318
 319         /* Methods */
 320
 321         /**
 322          * @return bool
 323          */
 324         public function isRaw() {
 325                 return true;
 326         }
 327
 328         /**
 329          * Get the load URL of the startup modules.
 330          *
 331          * This is a helper for getScript(), but can also be called standalone, such
 332          * as when generating an AppCache manifest.
 333          *
 334          * @param ResourceLoaderContext $context
 335          * @return string
 336          */
 337         public static function getStartupModulesUrl( ResourceLoaderContext $context ) {
 338                 // The core modules:
 339                 $moduleNames = array( 'jquery', 'mediawiki' );
 340
 341                 // Get the latest version
 342                 $loader = $context->getResourceLoader();
 343                 $version = 0;
 344                 foreach ( $moduleNames as $moduleName ) {
 345                         $version = max( $version,
 346                                 $loader->getModule( $moduleName )->getModifiedTime( $context )
 347                         );
 348                 }
 349
 350                 $query = array(
 351                         'modules' => ResourceLoader::makePackedModulesString( $moduleNames ),
 352                         'only' => 'scripts',
 353                         'lang' => $context->getLanguage(),
 354                         'skin' => $context->getSkin(),
 355                         'debug' => $context->getDebug() ? 'true' : 'false',
 356                         'version' => wfTimestamp( TS_ISO_8601_BASIC, $version )
 357                 );
 358                 // Ensure uniform query order
 359                 ksort( $query );
 360                 return wfAppendQuery( wfScript( 'load' ), $query );
 361         }
 362
 363         /**
 364          * @param ResourceLoaderContext $context
 365          * @return string
 366          */
 367         public function getScript( ResourceLoaderContext $context ) {
 368                 global $IP;
 369
 370                 $out = file_get_contents( "$IP/resources/src/startup.js" );
 371                 if ( $context->getOnly() === 'scripts' ) {
 372
 373                         // Startup function
 374                         $configuration = $this->getConfigSettings( $context );
 375                         $registrations = $this->getModuleRegistrations( $context );
 376                         // Fix indentation
 377                         $registrations = str_replace( "\n", "\n\t", trim( $registrations ) );
 378                         $out .= "var startUp = function () {\n" .
 379                                 "\tmw.config = new " .
 380                                 Xml::encodeJsCall( 'mw.Map', array( $this->getConfig()->get( 'LegacyJavaScriptGlobals' ) ) ) . "\n" .
 381                                 "\t$registrations\n" .
 382                                 "\t" . Xml::encodeJsCall( 'mw.config.set', array( $configuration ) ) .
 383                                 "};\n";
 384
 385                         // Conditional script injection
 386                         $scriptTag = Html::linkedScript( self::getStartupModulesUrl( $context ) );
 387                         $out .= "if ( isCompatible() ) {\n" .
 388                                 "\t" . Xml::encodeJsCall( 'document.write', array( $scriptTag ) ) .
 389                                 "}";
 390                 }
 391
 392                 return $out;
 393         }
 394
 395         /**
 396          * @return bool
 397          */
 398         public function supportsURLLoading() {
 399                 return false;
 400         }
 401
 402         /**
 403          * @param ResourceLoaderContext $context
 404          * @return array|mixed
 405          */
 406         public function getModifiedTime( ResourceLoaderContext $context ) {
 407                 global $IP;
 408
 409                 $hash = $context->getHash();
 410                 if ( isset( $this->modifiedTime[$hash] ) ) {
 411                         return $this->modifiedTime[$hash];
 412                 }
 413
 414                 // Call preloadModuleInfo() on ALL modules as we're about
 415                 // to call getModifiedTime() on all of them
 416                 $loader = $context->getResourceLoader();
 417                 $loader->preloadModuleInfo( $loader->getModuleNames(), $context );
 418
 419                 $time = max(
 420                         wfTimestamp( TS_UNIX, $this->getConfig()->get( 'CacheEpoch' ) ),
 421                         filemtime( "$IP/resources/src/startup.js" ),
 422                         $this->getHashMtime( $context )
 423                 );
 424
 425                 // ATTENTION!: Because of the line below, this is not going to cause
 426                 // infinite recursion - think carefully before making changes to this
 427                 // code!
 428                 // Pre-populate modifiedTime with something because the the loop over
 429                 // all modules below includes the the startup module (this module).
 430                 $this->modifiedTime[$hash] = 1;
 431
 432                 foreach ( $loader->getModuleNames() as $name ) {
 433                         $module = $loader->getModule( $name );
 434                         $time = max( $time, $module->getModifiedTime( $context ) );
 435                 }
 436
 437                 $this->modifiedTime[$hash] = $time;
 438                 return $this->modifiedTime[$hash];
 439         }
 440
 441         /**
 442          * Hash of all dynamic data embedded in getScript().
 443          *
 444          * Detect changes to mw.config settings embedded in #getScript (bug 28899).
 445          *
 446          * @param ResourceLoaderContext $context
 447          * @return string Hash
 448          */
 449         public function getModifiedHash( ResourceLoaderContext $context ) {
 450                 $data = array(
 451                         'vars' => $this->getConfigSettings( $context ),
 452                         'wgLegacyJavaScriptGlobals' => $this->getConfig()->get( 'LegacyJavaScriptGlobals' ),
 453                 );
 454
 455                 return md5( serialize( $data ) );
 456         }
 457
 458         /**
 459          * @return string
 460          */
 461         public function getGroup() {
 462                 return 'startup';
 463         }
 464 }