includes/specialpage/SpecialPageFactory.php

   1 <?php
   2 /**
   3  * Factory for handling the special page list and generating SpecialPage objects.
   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  * @ingroup SpecialPage
  22  * @defgroup SpecialPage SpecialPage
  23  */
  24 use MediaWiki\Linker\LinkRenderer;
  25 use Wikimedia\ObjectFactory;
  26
  27 /**
  28  * Factory for handling the special page list and generating SpecialPage objects.
  29  *
  30  * To add a special page in an extension, add to $wgSpecialPages either
  31  * an object instance or an array containing the name and constructor
  32  * parameters. The latter is preferred for performance reasons.
  33  *
  34  * The object instantiated must be either an instance of SpecialPage or a
  35  * sub-class thereof. It must have an execute() method, which sends the HTML
  36  * for the special page to $wgOut. The parent class has an execute() method
  37  * which distributes the call to the historical global functions. Additionally,
  38  * execute() also checks if the user has the necessary access privileges
  39  * and bails out if not.
  40  *
  41  * To add a core special page, use the similar static list in
  42  * SpecialPageFactory::$list. To remove a core static special page at runtime, use
  43  * a SpecialPage_initList hook.
  44  *
  45  * @ingroup SpecialPage
  46  * @since 1.17
  47  */
  48 class SpecialPageFactory {
  49         /**
  50          * List of special page names to the subclass of SpecialPage which handles them.
  51          */
  52         private static $coreList = [
  53                 // Maintenance Reports
  54                 'BrokenRedirects' => BrokenRedirectsPage::class,
  55                 'Deadendpages' => DeadendPagesPage::class,
  56                 'DoubleRedirects' => DoubleRedirectsPage::class,
  57                 'Longpages' => LongPagesPage::class,
  58                 'Ancientpages' => AncientPagesPage::class,
  59                 'Lonelypages' => LonelyPagesPage::class,
  60                 'Fewestrevisions' => FewestrevisionsPage::class,
  61                 'Withoutinterwiki' => WithoutInterwikiPage::class,
  62                 'Protectedpages' => SpecialProtectedpages::class,
  63                 'Protectedtitles' => SpecialProtectedtitles::class,
  64                 'Shortpages' => ShortPagesPage::class,
  65                 'Uncategorizedcategories' => UncategorizedCategoriesPage::class,
  66                 'Uncategorizedimages' => UncategorizedImagesPage::class,
  67                 'Uncategorizedpages' => UncategorizedPagesPage::class,
  68                 'Uncategorizedtemplates' => UncategorizedTemplatesPage::class,
  69                 'Unusedcategories' => UnusedCategoriesPage::class,
  70                 'Unusedimages' => UnusedimagesPage::class,
  71                 'Unusedtemplates' => UnusedtemplatesPage::class,
  72                 'Unwatchedpages' => UnwatchedpagesPage::class,
  73                 'Wantedcategories' => WantedCategoriesPage::class,
  74                 'Wantedfiles' => WantedFilesPage::class,
  75                 'Wantedpages' => WantedPagesPage::class,
  76                 'Wantedtemplates' => WantedTemplatesPage::class,
  77
  78                 // List of pages
  79                 'Allpages' => SpecialAllPages::class,
  80                 'Prefixindex' => SpecialPrefixindex::class,
  81                 'Categories' => SpecialCategories::class,
  82                 'Listredirects' => ListredirectsPage::class,
  83                 'PagesWithProp' => SpecialPagesWithProp::class,
  84                 'TrackingCategories' => SpecialTrackingCategories::class,
  85
  86                 // Authentication
  87                 'Userlogin' => SpecialUserLogin::class,
  88                 'Userlogout' => SpecialUserLogout::class,
  89                 'CreateAccount' => SpecialCreateAccount::class,
  90                 'LinkAccounts' => SpecialLinkAccounts::class,
  91                 'UnlinkAccounts' => SpecialUnlinkAccounts::class,
  92                 'ChangeCredentials' => SpecialChangeCredentials::class,
  93                 'RemoveCredentials' => SpecialRemoveCredentials::class,
  94
  95                 // Users and rights
  96                 'Activeusers' => SpecialActiveUsers::class,
  97                 'Block' => SpecialBlock::class,
  98                 'Unblock' => SpecialUnblock::class,
  99                 'BlockList' => SpecialBlockList::class,
 100                 'AutoblockList' => SpecialAutoblockList::class,
 101                 'ChangePassword' => SpecialChangePassword::class,
 102                 'BotPasswords' => SpecialBotPasswords::class,
 103                 'PasswordReset' => SpecialPasswordReset::class,
 104                 'DeletedContributions' => DeletedContributionsPage::class,
 105                 'Preferences' => SpecialPreferences::class,
 106                 'ResetTokens' => SpecialResetTokens::class,
 107                 'Contributions' => SpecialContributions::class,
 108                 'Listgrouprights' => SpecialListGroupRights::class,
 109                 'Listgrants' => SpecialListGrants::class,
 110                 'Listusers' => SpecialListUsers::class,
 111                 'Listadmins' => SpecialListAdmins::class,
 112                 'Listbots' => SpecialListBots::class,
 113                 'Userrights' => UserrightsPage::class,
 114                 'EditWatchlist' => SpecialEditWatchlist::class,
 115                 'PasswordPolicies' => SpecialPasswordPolicies::class,
 116
 117                 // Recent changes and logs
 118                 'Newimages' => SpecialNewFiles::class,
 119                 'Log' => SpecialLog::class,
 120                 'Watchlist' => SpecialWatchlist::class,
 121                 'Newpages' => SpecialNewpages::class,
 122                 'Recentchanges' => SpecialRecentChanges::class,
 123                 'Recentchangeslinked' => SpecialRecentChangesLinked::class,
 124                 'Tags' => SpecialTags::class,
 125
 126                 // Media reports and uploads
 127                 'Listfiles' => SpecialListFiles::class,
 128                 'Filepath' => SpecialFilepath::class,
 129                 'MediaStatistics' => MediaStatisticsPage::class,
 130                 'MIMEsearch' => MIMEsearchPage::class,
 131                 'FileDuplicateSearch' => FileDuplicateSearchPage::class,
 132                 'Upload' => SpecialUpload::class,
 133                 'UploadStash' => SpecialUploadStash::class,
 134                 'ListDuplicatedFiles' => ListDuplicatedFilesPage::class,
 135
 136                 // Data and tools
 137                 'ApiSandbox' => SpecialApiSandbox::class,
 138                 'Statistics' => SpecialStatistics::class,
 139                 'Allmessages' => SpecialAllMessages::class,
 140                 'Version' => SpecialVersion::class,
 141                 'Lockdb' => SpecialLockdb::class,
 142                 'Unlockdb' => SpecialUnlockdb::class,
 143
 144                 // Redirecting special pages
 145                 'LinkSearch' => LinkSearchPage::class,
 146                 'Randompage' => RandomPage::class,
 147                 'RandomInCategory' => SpecialRandomInCategory::class,
 148                 'Randomredirect' => SpecialRandomredirect::class,
 149                 'Randomrootpage' => SpecialRandomrootpage::class,
 150                 'GoToInterwiki' => SpecialGoToInterwiki::class,
 151
 152                 // High use pages
 153                 'Mostlinkedcategories' => MostlinkedCategoriesPage::class,
 154                 'Mostimages' => MostimagesPage::class,
 155                 'Mostinterwikis' => MostinterwikisPage::class,
 156                 'Mostlinked' => MostlinkedPage::class,
 157                 'Mostlinkedtemplates' => MostlinkedTemplatesPage::class,
 158                 'Mostcategories' => MostcategoriesPage::class,
 159                 'Mostrevisions' => MostrevisionsPage::class,
 160
 161                 // Page tools
 162                 'ComparePages' => SpecialComparePages::class,
 163                 'Export' => SpecialExport::class,
 164                 'Import' => SpecialImport::class,
 165                 'Undelete' => SpecialUndelete::class,
 166                 'Whatlinkshere' => SpecialWhatLinksHere::class,
 167                 'MergeHistory' => SpecialMergeHistory::class,
 168                 'ExpandTemplates' => SpecialExpandTemplates::class,
 169
 170                 // Other
 171                 'Booksources' => SpecialBookSources::class,
 172
 173                 // Unlisted / redirects
 174                 'ApiHelp' => SpecialApiHelp::class,
 175                 'Blankpage' => SpecialBlankpage::class,
 176                 'Diff' => SpecialDiff::class,
 177                 'EditTags' => SpecialEditTags::class,
 178                 'Emailuser' => SpecialEmailUser::class,
 179                 'Movepage' => MovePageForm::class,
 180                 'Mycontributions' => SpecialMycontributions::class,
 181                 'MyLanguage' => SpecialMyLanguage::class,
 182                 'Mypage' => SpecialMypage::class,
 183                 'Mytalk' => SpecialMytalk::class,
 184                 'Myuploads' => SpecialMyuploads::class,
 185                 'AllMyUploads' => SpecialAllMyUploads::class,
 186                 'PermanentLink' => SpecialPermanentLink::class,
 187                 'Redirect' => SpecialRedirect::class,
 188                 'Revisiondelete' => SpecialRevisionDelete::class,
 189                 'RunJobs' => SpecialRunJobs::class,
 190                 'Specialpages' => SpecialSpecialpages::class,
 191                 'PageData' => SpecialPageData::class,
 192         ];
 193
 194         private static $list;
 195         private static $aliases;
 196
 197         /**
 198          * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 199          * the internal list has already been initialized, e.g. during testing.
 200          */
 201         public static function resetList() {
 202                 self::$list = null;
 203                 self::$aliases = null;
 204         }
 205
 206         /**
 207          * Returns a list of canonical special page names.
 208          * May be used to iterate over all registered special pages.
 209          *
 210          * @return string[]
 211          */
 212         public static function getNames() {
 213                 return array_keys( self::getPageList() );
 214         }
 215
 216         /**
 217          * Get the special page list as an array
 218          *
 219          * @return array
 220          */
 221         private static function getPageList() {
 222                 global $wgSpecialPages;
 223                 global $wgDisableInternalSearch, $wgEmailAuthentication;
 224                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 225                 global $wgPageLanguageUseDB, $wgContentHandlerUseDB;
 226
 227                 if ( !is_array( self::$list ) ) {
 228                         self::$list = self::$coreList;
 229
 230                         if ( !$wgDisableInternalSearch ) {
 231                                 self::$list['Search'] = SpecialSearch::class;
 232                         }
 233
 234                         if ( $wgEmailAuthentication ) {
 235                                 self::$list['Confirmemail'] = EmailConfirmation::class;
 236                                 self::$list['Invalidateemail'] = EmailInvalidation::class;
 237                         }
 238
 239                         if ( $wgEnableEmail ) {
 240                                 self::$list['ChangeEmail'] = SpecialChangeEmail::class;
 241                         }
 242
 243                         if ( $wgEnableJavaScriptTest ) {
 244                                 self::$list['JavaScriptTest'] = SpecialJavaScriptTest::class;
 245                         }
 246
 247                         if ( $wgPageLanguageUseDB ) {
 248                                 self::$list['PageLanguage'] = SpecialPageLanguage::class;
 249                         }
 250                         if ( $wgContentHandlerUseDB ) {
 251                                 self::$list['ChangeContentModel'] = SpecialChangeContentModel::class;
 252                         }
 253
 254                         // Add extension special pages
 255                         self::$list = array_merge( self::$list, $wgSpecialPages );
 256
 257                         // This hook can be used to disable unwanted core special pages
 258                         // or conditionally register special pages.
 259                         Hooks::run( 'SpecialPage_initList', [ &self::$list ] );
 260
 261                 }
 262
 263                 return self::$list;
 264         }
 265
 266         /**
 267          * Initialise and return the list of special page aliases. Returns an array where
 268          * the key is an alias, and the value is the canonical name of the special page.
 269          * All registered special pages are guaranteed to map to themselves.
 270          * @return array
 271          */
 272         private static function getAliasList() {
 273                 if ( is_null( self::$aliases ) ) {
 274                         global $wgContLang;
 275                         $aliases = $wgContLang->getSpecialPageAliases();
 276                         $pageList = self::getPageList();
 277
 278                         self::$aliases = [];
 279                         $keepAlias = [];
 280
 281                         // Force every canonical name to be an alias for itself.
 282                         foreach ( $pageList as $name => $stuff ) {
 283                                 $caseFoldedAlias = $wgContLang->caseFold( $name );
 284                                 self::$aliases[$caseFoldedAlias] = $name;
 285                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 286                         }
 287
 288                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 289                         if ( is_array( $aliases ) ) {
 290                                 foreach ( $aliases as $realName => $aliasList ) {
 291                                         $aliasList = array_values( $aliasList );
 292                                         foreach ( $aliasList as $i => $alias ) {
 293                                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 294
 295                                                 if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 296                                                         $realName === self::$aliases[$caseFoldedAlias]
 297                                                 ) {
 298                                                         // Ignore same-realName conflicts
 299                                                         continue;
 300                                                 }
 301
 302                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 303                                                         self::$aliases[$caseFoldedAlias] = $realName;
 304                                                         if ( !$i ) {
 305                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 306                                                         }
 307                                                 } elseif ( !$i ) {
 308                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 309                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 310                                                                 self::$aliases[$caseFoldedAlias]
 311                                                         );
 312                                                 }
 313                                         }
 314                                 }
 315                         }
 316                 }
 317
 318                 return self::$aliases;
 319         }
 320
 321         /**
 322          * Given a special page name with a possible subpage, return an array
 323          * where the first element is the special page name and the second is the
 324          * subpage.
 325          *
 326          * @param string $alias
 327          * @return array Array( String, String|null ), or array( null, null ) if the page is invalid
 328          */
 329         public static function resolveAlias( $alias ) {
 330                 global $wgContLang;
 331                 $bits = explode( '/', $alias, 2 );
 332
 333                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 334                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 335                 $aliases = self::getAliasList();
 336                 if ( isset( $aliases[$caseFoldedAlias] ) ) {
 337                         $name = $aliases[$caseFoldedAlias];
 338                 } else {
 339                         return [ null, null ];
 340                 }
 341
 342                 if ( !isset( $bits[1] ) ) { // T4087
 343                         $par = null;
 344                 } else {
 345                         $par = $bits[1];
 346                 }
 347
 348                 return [ $name, $par ];
 349         }
 350
 351         /**
 352          * Check if a given name exist as a special page or as a special page alias
 353          *
 354          * @param string $name Name of a special page
 355          * @return bool True if a special page exists with this name
 356          */
 357         public static function exists( $name ) {
 358                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 359
 360                 $specialPageList = self::getPageList();
 361                 return isset( $specialPageList[$title] );
 362         }
 363
 364         /**
 365          * Find the object with a given name and return it (or NULL)
 366          *
 367          * @param string $name Special page name, may be localised and/or an alias
 368          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 369          */
 370         public static function getPage( $name ) {
 371                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 372
 373                 $specialPageList = self::getPageList();
 374
 375                 if ( isset( $specialPageList[$realName] ) ) {
 376                         $rec = $specialPageList[$realName];
 377
 378                         if ( is_callable( $rec ) ) {
 379                                 // Use callback to instantiate the special page
 380                                 $page = call_user_func( $rec );
 381                         } elseif ( is_string( $rec ) ) {
 382                                 $className = $rec;
 383                                 $page = new $className;
 384                         } elseif ( is_array( $rec ) ) {
 385                                 $className = array_shift( $rec );
 386                                 // @deprecated, officially since 1.18, unofficially since forever
 387                                 wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 388                                         "define a subclass of SpecialPage instead.", '1.18' );
 389                                 $page = ObjectFactory::getObjectFromSpec( [
 390                                         'class' => $className,
 391                                         'args' => $rec,
 392                                         'closure_expansion' => false,
 393                                 ] );
 394                         } elseif ( $rec instanceof SpecialPage ) {
 395                                 $page = $rec; // XXX: we should deep clone here
 396                         } else {
 397                                 $page = null;
 398                         }
 399
 400                         if ( $page instanceof SpecialPage ) {
 401                                 return $page;
 402                         } else {
 403                                 // It's not a classname, nor a callback, nor a legacy constructor array,
 404                                 // nor a special page object. Give up.
 405                                 wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 406                                 return null;
 407                         }
 408
 409                 } else {
 410                         return null;
 411                 }
 412         }
 413
 414         /**
 415          * Return categorised listable special pages which are available
 416          * for the current user, and everyone.
 417          *
 418          * @param User|null $user User object to check permissions, $wgUser will be used
 419          *        if not provided
 420          * @return array ( string => Specialpage )
 421          */
 422         public static function getUsablePages( User $user = null ) {
 423                 $pages = [];
 424                 if ( $user === null ) {
 425                         global $wgUser;
 426                         $user = $wgUser;
 427                 }
 428                 foreach ( self::getPageList() as $name => $rec ) {
 429                         $page = self::getPage( $name );
 430                         if ( $page ) { // not null
 431                                 $page->setContext( RequestContext::getMain() );
 432                                 if ( $page->isListed()
 433                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 434                                 ) {
 435                                         $pages[$name] = $page;
 436                                 }
 437                         }
 438                 }
 439
 440                 return $pages;
 441         }
 442
 443         /**
 444          * Return categorised listable special pages for all users
 445          *
 446          * @return array ( string => Specialpage )
 447          */
 448         public static function getRegularPages() {
 449                 $pages = [];
 450                 foreach ( self::getPageList() as $name => $rec ) {
 451                         $page = self::getPage( $name );
 452                         if ( $page && $page->isListed() && !$page->isRestricted() ) {
 453                                 $pages[$name] = $page;
 454                         }
 455                 }
 456
 457                 return $pages;
 458         }
 459
 460         /**
 461          * Return categorised listable special pages which are available
 462          * for the current user, but not for everyone
 463          *
 464          * @param User|null $user User object to use or null for $wgUser
 465          * @return array ( string => Specialpage )
 466          */
 467         public static function getRestrictedPages( User $user = null ) {
 468                 $pages = [];
 469                 if ( $user === null ) {
 470                         global $wgUser;
 471                         $user = $wgUser;
 472                 }
 473                 foreach ( self::getPageList() as $name => $rec ) {
 474                         $page = self::getPage( $name );
 475                         if ( $page
 476                                 && $page->isListed()
 477                                 && $page->isRestricted()
 478                                 && $page->userCanExecute( $user )
 479                         ) {
 480                                 $pages[$name] = $page;
 481                         }
 482                 }
 483
 484                 return $pages;
 485         }
 486
 487         /**
 488          * Execute a special page path.
 489          * The path may contain parameters, e.g. Special:Name/Params
 490          * Extracts the special page name and call the execute method, passing the parameters
 491          *
 492          * Returns a title object if the page is redirected, false if there was no such special
 493          * page, and true if it was successful.
 494          *
 495          * @param Title &$title
 496          * @param IContextSource &$context
 497          * @param bool $including Bool output is being captured for use in {{special:whatever}}
 498          * @param LinkRenderer|null $linkRenderer (since 1.28)
 499          *
 500          * @return bool|Title
 501          */
 502         public static function executePath( Title &$title, IContextSource &$context, $including = false,
 503                 LinkRenderer $linkRenderer = null
 504         ) {
 505                 // @todo FIXME: Redirects broken due to this call
 506                 $bits = explode( '/', $title->getDBkey(), 2 );
 507                 $name = $bits[0];
 508                 if ( !isset( $bits[1] ) ) { // T4087
 509                         $par = null;
 510                 } else {
 511                         $par = $bits[1];
 512                 }
 513
 514                 $page = self::getPage( $name );
 515                 if ( !$page ) {
 516                         $context->getOutput()->setArticleRelated( false );
 517                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 518
 519                         global $wgSend404Code;
 520                         if ( $wgSend404Code ) {
 521                                 $context->getOutput()->setStatusCode( 404 );
 522                         }
 523
 524                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 525
 526                         return false;
 527                 }
 528
 529                 if ( !$including ) {
 530                         // Narrow DB query expectations for this HTTP request
 531                         $trxLimits = $context->getConfig()->get( 'TrxProfilerLimits' );
 532                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 533                         if ( $context->getRequest()->wasPosted() && !$page->doesWrites() ) {
 534                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 535                                 $context->getRequest()->markAsSafeRequest();
 536                         }
 537                 }
 538
 539                 // Page exists, set the context
 540                 $page->setContext( $context );
 541
 542                 if ( !$including ) {
 543                         // Redirect to canonical alias for GET commands
 544                         // Not for POST, we'd lose the post data, so it's best to just distribute
 545                         // the request. Such POST requests are possible for old extensions that
 546                         // generate self-links without being aware that their default name has
 547                         // changed.
 548                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 549                                 $query = $context->getRequest()->getQueryValues();
 550                                 unset( $query['title'] );
 551                                 $title = $page->getPageTitle( $par );
 552                                 $url = $title->getFullURL( $query );
 553                                 $context->getOutput()->redirect( $url );
 554
 555                                 return $title;
 556                         } else {
 557                                 $context->setTitle( $page->getPageTitle( $par ) );
 558                         }
 559                 } elseif ( !$page->isIncludable() ) {
 560                         return false;
 561                 }
 562
 563                 $page->including( $including );
 564                 if ( $linkRenderer ) {
 565                         $page->setLinkRenderer( $linkRenderer );
 566                 }
 567
 568                 // Execute special page
 569                 $page->run( $par );
 570
 571                 return true;
 572         }
 573
 574         /**
 575          * Just like executePath() but will override global variables and execute
 576          * the page in "inclusion" mode. Returns true if the execution was
 577          * successful or false if there was no such special page, or a title object
 578          * if it was a redirect.
 579          *
 580          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 581          * variables so that the special page will get the context it'd expect on a
 582          * normal request, and then restores them to their previous values after.
 583          *
 584          * @param Title $title
 585          * @param IContextSource $context
 586          * @param LinkRenderer|null $linkRenderer (since 1.28)
 587          * @return string HTML fragment
 588          */
 589         public static function capturePath(
 590                 Title $title, IContextSource $context, LinkRenderer $linkRenderer = null
 591         ) {
 592                 global $wgTitle, $wgOut, $wgRequest, $wgUser, $wgLang;
 593                 $main = RequestContext::getMain();
 594
 595                 // Save current globals and main context
 596                 $glob = [
 597                         'title' => $wgTitle,
 598                         'output' => $wgOut,
 599                         'request' => $wgRequest,
 600                         'user' => $wgUser,
 601                         'language' => $wgLang,
 602                 ];
 603                 $ctx = [
 604                         'title' => $main->getTitle(),
 605                         'output' => $main->getOutput(),
 606                         'request' => $main->getRequest(),
 607                         'user' => $main->getUser(),
 608                         'language' => $main->getLanguage(),
 609                 ];
 610
 611                 // Override
 612                 $wgTitle = $title;
 613                 $wgOut = $context->getOutput();
 614                 $wgRequest = $context->getRequest();
 615                 $wgUser = $context->getUser();
 616                 $wgLang = $context->getLanguage();
 617                 $main->setTitle( $title );
 618                 $main->setOutput( $context->getOutput() );
 619                 $main->setRequest( $context->getRequest() );
 620                 $main->setUser( $context->getUser() );
 621                 $main->setLanguage( $context->getLanguage() );
 622
 623                 // The useful part
 624                 $ret = self::executePath( $title, $context, true, $linkRenderer );
 625
 626                 // Restore old globals and context
 627                 $wgTitle = $glob['title'];
 628                 $wgOut = $glob['output'];
 629                 $wgRequest = $glob['request'];
 630                 $wgUser = $glob['user'];
 631                 $wgLang = $glob['language'];
 632                 $main->setTitle( $ctx['title'] );
 633                 $main->setOutput( $ctx['output'] );
 634                 $main->setRequest( $ctx['request'] );
 635                 $main->setUser( $ctx['user'] );
 636                 $main->setLanguage( $ctx['language'] );
 637
 638                 return $ret;
 639         }
 640
 641         /**
 642          * Get the local name for a specified canonical name
 643          *
 644          * @param string $name
 645          * @param string|bool $subpage
 646          * @return string
 647          */
 648         public static function getLocalNameFor( $name, $subpage = false ) {
 649                 global $wgContLang;
 650                 $aliases = $wgContLang->getSpecialPageAliases();
 651                 $aliasList = self::getAliasList();
 652
 653                 // Find the first alias that maps back to $name
 654                 if ( isset( $aliases[$name] ) ) {
 655                         $found = false;
 656                         foreach ( $aliases[$name] as $alias ) {
 657                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 658                                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 659                                 if ( isset( $aliasList[$caseFoldedAlias] ) &&
 660                                         $aliasList[$caseFoldedAlias] === $name
 661                                 ) {
 662                                         $name = $alias;
 663                                         $found = true;
 664                                         break;
 665                                 }
 666                         }
 667                         if ( !$found ) {
 668                                 wfWarn( "Did not find a usable alias for special page '$name'. " .
 669                                         "It seems all defined aliases conflict?" );
 670                         }
 671                 } else {
 672                         // Check if someone misspelled the correct casing
 673                         if ( is_array( $aliases ) ) {
 674                                 foreach ( $aliases as $n => $values ) {
 675                                         if ( strcasecmp( $name, $n ) === 0 ) {
 676                                                 wfWarn( "Found alias defined for $n when searching for " .
 677                                                         "special page aliases for $name. Case mismatch?" );
 678                                                 return self::getLocalNameFor( $n, $subpage );
 679                                         }
 680                                 }
 681                         }
 682
 683                         wfWarn( "Did not find alias for special page '$name'. " .
 684                                 "Perhaps no aliases are defined for it?" );
 685                 }
 686
 687                 if ( $subpage !== false && !is_null( $subpage ) ) {
 688                         // Make sure it's in dbkey form
 689                         $subpage = str_replace( ' ', '_', $subpage );
 690                         $name = "$name/$subpage";
 691                 }
 692
 693                 return $wgContLang->ucfirst( $name );
 694         }
 695
 696         /**
 697          * Get a title for a given alias
 698          *
 699          * @param string $alias
 700          * @return Title|null Title or null if there is no such alias
 701          */
 702         public static function getTitleForAlias( $alias ) {
 703                 list( $name, $subpage ) = self::resolveAlias( $alias );
 704                 if ( $name != null ) {
 705                         return SpecialPage::getTitleFor( $name, $subpage );
 706                 } else {
 707                         return null;
 708                 }
 709         }
 710 }